KR102090530B1 - Method and Apparatus for Cancelling Transmission Leakage Signal - Google Patents

Abstract

Disclosed are a method for removing a transmission leakage signal and an apparatus therefor. According to an embodiment of the present invention, an apparatus for removing a leakage signal comprises: a coefficient calculation module obtaining a first transmission signal for a transmission signal from a transmission module, and calculating a modulation coefficient based on initial charging information of the first transmission signal and a transmission leakage signal; a modulation module obtaining a second transmission signal for the transmission signal from the transmission module, and modulating the second transmission signal based on the modulation coefficient to generate a leakage removal signal; and a leakage signal removal module obtaining a reflected signal from which the transmitted signal is reflected to a target object through an antenna module, and merging the reflected signal and the leakage removing signal to remove the transmitted leakage signal included in the reflected signal, and transmitting a received signal in which the transmitted leakage signal is removed to a reception module.

Description

Method for removing transmission leakage signal and apparatus therefor {Method and Apparatus for Canceling Transmission Leakage Signal}

The present invention relates to a method and apparatus for removing the transmission leakage signal.

The content described in this section merely provides background information for an embodiment of the present invention and does not constitute a prior art.

Currently, most searchers are configured to detect the location of a target by transmitting and receiving a signal through one antenna. When a searcher transmits / receives a signal through one antenna, the number of relatively large antennas among components of the searcher can be reduced compared to a searcher having a transmitting antenna and a receiving antenna separately, which greatly improves the space efficiency of the searcher. can do. That is, due to the merit of miniaturizing the size of a device having a searcher such as a guided weapon, most searchers are currently designed to transmit and receive using a single antenna.

When implementing a radar device that shares one antenna for transmission and reception, the isolation of transmission and reception of elements such as circulators, combiners, or dividers used for signal separation elements is very low in the millimeter wave band. Therefore, the signal coming out of the output of the oscillator flows into the receiving end, and the reception sensitivity of the radar device decreases, making it difficult to detect the weakly received signal. In addition, the characteristics of the entire radar device may be deteriorated by saturating the low-noise amplifier or mixer constituting the receiving end. In addition, the noise figure of the receiving end deteriorates due to the transmission leakage signal of the transmitting end.

Accordingly, various studies have been conducted such as low SWR RF components, High Isolation Diplexer, and simple signal processing to analyze noise components in order to remove the transmission leakage signal. Most of them have skills.

In addition, the conventional transmission leakage signal removal technology has a long cancellation time for removing transmission leakage power, so it is difficult to detect a close target and thus a minimum detection distance cannot be secured or a leakage signal removal rate is low. Due to the residual signal of leakage power applied to (Residual Noise), it is difficult to secure the reception dynamic range.

The present invention calculates a modulation coefficient using the first transmission signal, and a transmission leakage signal that removes the transmission leakage signal included in the reflected signal using the leakage removal signal generated by modulating the second transmission signal based on the modulation coefficient The main objective is to provide a removal method and a device therefor.

According to an aspect of the present invention, the leakage signal removal apparatus for achieving the above object, obtains a first transmission signal for the transmission signal from the transmission module, and based on the initial charging information of the first transmission signal and the transmission leakage signal Coefficient calculation module for calculating a modulation coefficient; A modulation module that acquires a second transmission signal for the transmission signal from the transmission module, and modulates the second transmission signal based on the modulation coefficient to generate a leakage removal signal; And acquiring a reflection signal from which the transmission signal is reflected to a target object through an antenna module, merging the reflection signal and the leakage removal signal to remove the transmission leakage signal included in the reflection signal, and removing the transmission leakage signal. It may include a leakage signal removal module for transmitting the received signal to the receiving module.

In addition, according to another aspect of the present invention, a method for removing a leakage signal for achieving the above object comprises: obtaining a first transmission signal for a transmission signal from a transmission module; Calculating a modulation coefficient based on initial charging information of the first transmission signal and the transmission leakage signal; Obtaining a second transmission signal for the transmission signal from the transmission module; Modulating the second transmission signal based on the modulation coefficient to generate a leakage cancellation signal; Obtaining a reflected signal from which the transmitted signal is reflected by a target object through an antenna module; And removing the transmission leakage signal included in the reflection signal by combining the reflection signal and the leakage removal signal, and transmitting the received signal from which the transmission leakage signal has been removed to a reception module.

As described above, the present invention removes the transmission leakage signal by applying the signal for the purpose of removing the leakage generated through optimization of the modulation coefficient and time delay of the transmission signal, thereby securing a reception dynamic range and receiving Sensitivity can be increased.

In addition, the present invention can remove the transmission leakage signal by applying the signal for the purpose of removing the leakage generated through the optimization of the modulation coefficient, and thus, the cancellation time for removing the transmission leakage signal can be shortened and the target object is detected. This has the effect of improving the minimum detection distance.

In addition, according to the present invention, the transmission leakage signal is removed by applying a signal for the purpose of removing the leakage generated through time delay of the transmission signal, thereby improving the leakage signal cancellation ratio and minimizing the residual signal to receive the reception operation area. It has the effect of increasing (Dynamic Range).

1 is a block diagram schematically illustrating an apparatus for removing a transmission leakage signal according to an embodiment of the present invention.
2 is a flowchart illustrating a method of removing a transmission leakage signal according to an embodiment of the present invention.
3 is an exemplary view for explaining an operation of removing a transmission leakage signal from a radar detection apparatus according to an embodiment of the present invention.
4 is an exemplary diagram for describing a delay operation for removing a transmission leakage signal according to an embodiment of the present invention.
5 is a graph showing a result of removing a transmission leakage signal according to an embodiment of the present invention.
6 is a graph showing results of minimizing residual signals according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, when it is determined that detailed descriptions of related known configurations or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted. In addition, although preferred embodiments of the present invention will be described below, the technical spirit of the present invention is not limited to or limited thereto, and can be variously implemented by a person skilled in the art. Hereinafter, a method for removing a transmission leakage signal and an apparatus therefor will be described in detail with reference to the drawings.

Although the leakage signal removal device of the present invention is described as being applied to a radar detection device, the present invention is not limited thereto, and can be applied to various fields (eg, base stations, communication RF devices, etc.) where transmission leakage signals occur.

1 is a block diagram schematically showing a radar detection apparatus for removing a transmission leakage signal according to an embodiment of the present invention.

The radar detection device 10 according to the present embodiment includes a transmission module 12, an antenna module 14, a reception module 16, and a leakage signal removal device 100. The leakage signal removal apparatus 100 includes a coefficient calculation module 110, a modulation module 120, a leakage signal removal module 130, and a signal delay module 140. The leakage signal removing device 100 of FIG. 1 is according to an embodiment, and not all blocks shown in FIG. 1 are essential components, and in another embodiment, some blocks included in the leakage signal removing device 100 are added. , Can be changed or deleted.

The radar detection device 10 transmits and receives a transmission signal for detecting a target object and a reflection signal therefor, and removes a transmission leakage signal included in the reflection signal to obtain a reception signal for detecting the target object. .

The transmission module 12 performs an operation of generating a transmission signal for detecting a target object. The transmission module 12 generates transmission signals of various transmission waveforms, such as a continuous wave type and a frequency modulated CW type. Here, when generating a transmission signal having a continuous waveform, the transmission module 12 may measure the speed of the target object, but cannot measure the distance to the target object due to a relatively narrow bandwidth. On the other hand, when generating a transmission signal having a frequency modulated continuous waveform, the transmission module 12 may increase the bandwidth by modulating the amplitude, frequency, and phase of the transmission signal to perform distance measurement and speed measurement with a target object. .

The transmission module 12 transmits the generated transmission signal to the antenna module 14 to be transmitted to the outside. The transmission signal transmitted through the antenna module 14 may be a radar detection signal for detecting a target object.

In addition, the transmission module 12 transmits the generated transmission signal to the coefficient calculation module 110 and the modulation module 120. Here, the transmission signal transmitted to the coefficient calculation module 110 and the modulation module 120 may be a signal separated through a signal separator, or may be a transmission reference signal capable of checking amplitude, phase, and the like of the transmission signal. .

The transmission module 12 may transmit a transmission signal to each of the coefficient calculation module 110 and the modulation module 120, and the transmission signals delivered to each of the coefficient calculation module 110 and the modulation module 120 may be transmitted at different times. It may be the same signal output.

The transmission module 12 may transmit the first transmission signal to the coefficient calculation module 110 and the second transmission signal to the modulation module 120. Here, the first transmission signal and the second transmission signal may be the same signal as the transmission signal, but the output time of the first transmission signal and the second transmission signal may be adjusted through a time delay. For example, the transmission module 12 may transmit the first transmission signal to the coefficient calculation module 110 and the second transmission signal delayed through the time delay module to the modulation module 120. Here, the transmission module 12 may change the time delay value of the time delay module according to the time at which the modulation coefficient is calculated by the coefficient calculation module 110.

The antenna module 14 transmits a transmission signal to a target object or the outside, and performs an operation of receiving a reflection signal corresponding to the transmission signal.

The antenna module 14 may include an antenna capable of transmitting and receiving a transmission signal and a reception signal, and may include a circulator capable of determining a signal direction according to a transmission mode and a reception mode. The antenna module 14 may transmit and receive a transmission signal and a reception signal through one antenna through a circulator.

The antenna module 14 transmits a transmission signal obtained from the transmission module 12 in the transmission mode, and receives a reflection signal (RF signal) in which the transmission signal is reflected back to the target object in the reception mode. Here, the reflection signal includes a transmission leakage signal.

The antenna module 14 transmits the reflected signal received in the reception mode to the leakage signal removal device 100 and removes the transmission leakage signal included in the reflected signal through the leakage signal removal device 100 to receive module 16 To pass.

The reception module 16 acquires a reception signal based on the reflected signal received from the antenna module 14.

The reception module 16 may obtain a reception signal from which the transmission leakage signal included in the reflection signal is removed. Here, the transmission leakage signal included in the reflection signal may be removed by the leakage signal removal device 100.

The reception module 16 may acquire a reception signal in which the transmission leakage signal is completely removed, but is not limited thereto, and may be a reception signal including a residual signal.

The reception module 16 may transmit the received reception signal to the leakage signal removal apparatus 100 to update the modulation coefficient. The leakage signal removal apparatus 100 may receive the feedback signal from the reception module 16 and update the modulation coefficient generated to remove the transmission leakage signal included in the reflection signal.

In addition, the reception module 16 transmits the received reception signal to a separate signal processing module (not shown) so that signal processing for detection of the target object is performed.

The leakage signal removal apparatus 100 is connected to the transmission module 12, the antenna module 14, and the reception module 16 to perform an operation of removing the transmission leakage signal. The leakage signal removal apparatus 100 removes the transmission leakage signal generated in the process of receiving the transmission signal and the reception signal through the antenna module 14. The leakage signal removal apparatus 100 includes a coefficient calculation module 110, a modulation module 120, a leakage signal removal module 130, and a signal delay module 140.

The coefficient calculation module 110 obtains a first transmission signal for a transmission signal from the transmission module 12 and calculates a modulation coefficient based on initial charging information of the first transmission signal and the transmission leakage signal. The coefficient calculation module 110 measures a transmission leakage signal for a transmission signal, and obtains initial charging information for the transmission leakage signal to calculate a modulation coefficient. Here, the initial charging information of the transmission leakage signal means information that is input to the coefficient calculation module 110 by measuring the initial transmission leakage signal, and includes information on amplitude, phase, and the like of the transmission leakage signal.

The initial charging information may be measured based on the initial transmission leakage signal obtained from the antenna module 14, but is not limited thereto, and the initial transmission obtained through the leakage signal removal module 130 and the reception module 16 It can also be measured based on the leakage signal.

The coefficient calculation module 110 calculates a modulation coefficient by using initial charging information for the first transmission signal and the initial transmission leakage signal when the transmission signal is a continuous waveform (CW Type).

Meanwhile, the coefficient calculation module 110 calculates the modulation coefficient using initial charging information for the first transmission signal and the initial transmission leakage signal when the transmission signal is a frequency modulated continuous waveform (FMCW Type), and the reception module ( 16) The received signal is fed back and the modulation coefficient is updated. Here, the coefficient calculation module 110 repeatedly receives the received signal whenever the received signal is obtained in the receive mode, and updates the modulation coefficient so that the residual signal included in the received received signal is minimized.

The coefficient calculation module 110 calculates a modulation coefficient for an I signal value and a Q signal value for canceling a transmission leakage signal using the first transmission signal and initial charging information. The coefficient calculation module 110 may update and calculate the I signal value and the Q signal value so that the residual signal included in the received signal is minimized through feedback of the received signal. The coefficient calculation module 110 may reduce the time for calculating the modulation coefficient using the initial charging information, and may reduce the minimum detection distance of the radar detection device 10 by minimizing the residual signal.

The coefficient calculation module 110 includes a frequency sweep bandwidth, a pulse repetition time, a maximum RF delay mismatch, and a maximum loop response time in the transmission mode. The difference values for amplitude and phase difference between the first transmission signal and the initial transmission leakage signal according to the result may be stored in a memory (not shown), and the stored difference values may be used as initial values for calculating a modulation coefficient. When calculating the modulation coefficient by calculating the I signal value and the Q signal value by using the difference value stored in the memory as an initial value, the coefficient calculation module 110 can significantly shorten the calculation time of the modulation coefficient. According to the shortening, the minimum detection distance can be improved.

The coefficient calculation module 110 may calculate a modulation coefficient by using a predicted value for a variation between the first transmission signal and the transmission leakage signal according to the operation of the transmission waveform in the transmission mode.

The coefficient calculation module 110 stores the predicted values for the variations of the first transmission signal and the transmission leakage signal, and the measured values for frequency, amplitude, phase, etc. obtained through measurement, in a memory (not shown), and calculates modulation coefficients As the initial value of the algorithm to be used, the stored predicted value, measured value, etc. can be used. The coefficient calculation module 110 may accelerate the calculation time for calculating the optimized modulation coefficient for removing the transmission leakage signal by using the predicted value, the measured value, and the like stored as the initial value of the algorithm, and through this, the transmission leakage signal It can shorten the processing time to remove the. Here, the radar detection device 10 can secure a minimum detection distance by a shortened time.

As shown in [Table 1], the coefficient calculation module 110 includes a frequency sweep bandwidth, a pulse repetition time, a maximum RF delay mismatch, and a maximum loop response time. Based on (Maximum Loop response time), a prediction value for a frequency difference value between a first transmission signal and a transmission leakage signal, and a phase error value between the first transmission signal and the transmission leakage signal may be calculated and stored in a memory (not shown) have.

(A: Frequency sweep bandwidth, B: Pulse repetition time, C: Maximum RF delay mismatch, D: Maximum Loop response time)

In Table 1, A and B are variable values that can be changed, and C and D mean fixed values according to the measured values.

The modulation module 120 generates a leakage cancellation signal based on the second transmission signal and the modulation coefficient.

The modulation module 120 obtains a second transmission signal for the transmission signal from the transmission module 12, obtains a modulation coefficient from the coefficient calculation module 110, and modulates the second transmission signal based on the modulation coefficient to leak Generate a cancellation signal. Here, the modulation coefficient includes an I signal value and a Q signal value calculated by the coefficient calculation module 110. In other words, the modulation module 120 generates a leakage cancellation signal by varying the amplitude and phase of the second transmission signal according to the I signal value and the Q signal value included in the modulation coefficient. Here, the leakage cancellation signal is amplified to an amplitude of the same magnitude as the leakage signal according to a modulation coefficient calculated to cancel out the transmission leakage signal included in the reflected signal, and can be varied to have a phase difference that is opposite to the phase of the transmission leakage signal. have.

The modulation module 120 can obtain a second delayed transmission signal from the transmission module 12.

The modulation module 120 may acquire a second transmission signal delayed by the time delay module 140 included in the transmission module 12, but is not limited thereto. For example, the modulation module 120 acquires a second transmission signal that time-delays the transmission signal output from the transmission module 12 by using a time delay module located between the transmission module 12 and the modulation module 120. You may.

According to the time delay operation of the time delay module 140, the modulation module 120 may acquire a second transmission signal and a modulation coefficient at the same time to generate a leakage removal signal.

The leakage signal removal module 130 acquires a reflection signal from the antenna module 14 and performs an operation of removing a transmission leakage signal included in the reflection signal.

The leakage signal removal module 130 obtains a leakage removal signal from the modulation module 120, merges the reflection signal and the leakage removal signal to remove (cancel) the transmission leakage signal included in the reflection signal, and removes the transmission leakage signal. The received signal is transmitted to the receiving module 16.

The leakage signal removal module 130 merges the leakage cancellation signal having the same amplitude and a phase out of phase with the transmission leakage signal and the reflection signal to cancel the transmission leakage signal included in the reflection signal.

The signal delay module 140 performs a time delay for the transmission signal output from the transmission module 12. The signal delay module 140 performs a time delay to compensate for a time difference between the first transmission signal and the second transmission signal output from the transmission module 12. In other words, the signal delay module 140 adjusts the timing of the output time between the first transmission signal and the second transmission signal by causing the second transmission signal to delay the time after outputting the first transmission signal.

The signal delay module 140 performs a time delay in consideration of the time at which the modulation coefficient is calculated by the coefficient calculation module 110. Specifically, the signal delay module 140 has the time required for the second transmission signal to be transmitted to the modulation module 120 and the coefficient calculation module 110 to calculate the modulation coefficient calculated using the first transmission signal from the modulation module 120 The time delay for compensating for the time difference is performed so that the time required for transmission is the same.

The signal delay module 140 may be implemented in a form located in the transmission module 12, and may output a second transmission signal delayed in the transmission module 12 to the modulation module 120. On the other hand, the signal delay module 140 may be implemented in a form located between the transmission module 12 and the modulation module 120, after delaying the second transmission signal output from the transmission module 12 time modulation module It can also be delivered to (120).

The signal delay module 140 compensates for a time for calculating the modulation coefficient in the coefficient calculation module 110 through a time delay between the first transmission signal and the second transmission signal, thereby canceling the transmission leakage signal (Cancellation Depth (ratio)) Can improve.

The leakage signal removing apparatus 100 minimizes the residual signal of the received signal output to the receiving module 160 due to the time delay operation of the signal delay module 140. On the other hand, the leakage signal removing apparatus 100 uses the first transmission signal from the counting module 110 and the time required for the second transmission signal to be transmitted to the modulation module 120 due to the error of the signal delay module 140. If a difference occurs between the time required for the calculated modulation coefficient to be transmitted to the modulation module 120,

The first transmission signal input to calculate the modulation coefficient and the second transmission signal at the time when the modulation coefficient optimized by the coefficient calculation module 110 are applied may be inconsistent with each other, and thus, the transmission leakage signal in the reflected signal The residual signal remains even after removal. The signal delay module 140 performs a time delay operation to prevent the first transmission signal and the second transmission signal from having different amplitudes, frequencies, and phases.

2 is a flowchart illustrating a method of removing a transmission leakage signal according to an embodiment of the present invention.

The leakage signal removal apparatus 100 obtains a first transmission signal for the transmission signal from the transmission module 12 (S210), and calculates a modulation coefficient based on the first transmission signal and initial charging information (S220).

The leakage signal removing apparatus 100 may obtain the first transmission signal separated through the signal separator of the transmission module 12. Here, the first transmission signal may be the same signal as the transmission signal for detecting the target object, or may be a transmission reference signal that can confirm amplitude, phase, and the like of the transmission signal.

In addition, the leakage signal removing apparatus 100 measures the amplitude, phase, and the like of the transmission leakage signal to obtain initial charging information of the input transmission leakage signal, and uses the first transmission signal and the initial charging information to transmit the transmission leakage signal. The modulation coefficient is calculated by calculating the I signal value and the Q signal value to cancel.

The leakage signal removal apparatus 100 obtains a second transmission signal from the transmission module 12 (S230), and modulates the second transmission signal based on the modulation coefficient calculated in step S220 to generate a leakage removal signal (S250) ).

The leakage signal removing apparatus 100 obtains a second delayed transmission signal from the transmission module 12, and the second transmission signal is the same signal as the first transmission signal, but the output timings of the transmission module 12 are different. It can be a signal. Here, the leakage signal removal apparatus 100 generates a leakage removal signal using the second transmission signal and the modulation coefficient at the same time through the time delay of the second transmission signal.

The leakage signal removal apparatus 100 obtains a reflection signal including a transmission leakage signal from the receiving module 16 (S260), and removes the transmission leakage signal using the leakage removal signal (S270). The leakage signal removal device 100 merges the reflection signal and the leakage removal signal to remove (cancel) the transmission leakage signal included in the reflection signal, and transmits the received signal from which the transmission leakage signal has been removed to the reception module 16.

When the received signal is fed back, the leakage signal removing apparatus 100 updates the modulation coefficient so that the residual signal included in the received signal is minimized (S280). When the received signal is fed back, the leakage signal removing apparatus 100 may repeat the operation of returning to step S210 to generate a modulation coefficient.

Although FIG. 2 describes that each step is executed sequentially, the present invention is not limited thereto. In other words, since the steps described in FIG. 2 may be changed and executed or one or more steps may be executed in parallel, FIG. 3 is not limited to a time series sequence.

The method for removing a transmission leakage signal according to the present embodiment described in FIG. 2 may be implemented as an application (or program) and recorded in a recording medium readable by a terminal device (or computer). An application (or program) for implementing a transmission leakage signal removal method according to the present embodiment is recorded, and a recording medium that can be read by a terminal device (or computer) records all kinds of data that can be read by a computing system. Device or media.

3 is an exemplary view for explaining an operation of removing a transmission leakage signal from a radar detection apparatus according to an embodiment of the present invention.

The transmission module 12 performs an operation of generating a transmission signal for detecting a target object. The transmission module 12 includes a signal generator 310, signal separators 320, 322 and a transmitter 330. Meanwhile, the signal delay module 140 of the leakage signal removal device 100 may be located in the transmission module 12.

The signal generator 310 generates a transmission signal of a predetermined pattern. For example, the signal generator 310 may generate a transmission signal of a waveform such as a continuous wave type, a frequency modulated CW type, or the like. In addition, the frequency of the transmission signal generated from the signal generator 310 may be modulated. To this end, an oscillator (not shown) that modulates and outputs the transmission signal generated by the signal generator 310 according to the applied voltage may be further included.

The signal separators 320 and 322 separate the first transmission signal and the second transmission signal for removing the transmission leakage signal from the transmission signal generated by the signal generator 310 and distribute them to different paths. That is, the first signal separator 320 separates the first transmission signal and transmits it to the coefficient calculation module 110, and the second signal separator 322 separates the second transmission signal and transmits it to the modulation module 120. . Here, the first transmission signal and the second transmission signal may be the same signal as the transmission signal, but are not limited thereto, and may also be a transmission reference signal that can confirm amplitude, phase, and the like of the transmission signal.

The signal delay module 140 of the leakage signal removing device 100 may be located between the first signal separator 320 and the second signal separator 322 in the transmission module 12. The signal delay module 140 performs a time delay to compensate for a time difference between the first transmission signal and the second transmission signal output from the transmission module 12.

The transmitter 330 outputs a transmission signal generated from the signal generator 310. At this time, the transmitter 330 may include an amplifier (not shown) that amplifies and outputs a transmission signal. That is, the transmitter 330 may receive a transmission signal from the signal generator 310 and amplify it and transmit it to the circulator 342 of the antenna module 14.

The antenna module 14 transmits a transmission signal to a target object or the outside, and performs an operation of receiving a reflection signal corresponding to the transmission signal. The antenna module 14 may include an antenna 340 and a circulator 342.

The antenna 340 radiates a transmission signal supplied from the transmission module 12 to the outside. That is, the antenna 340 receives the transmission signal through the circulator 342 and radiates it to the outside. Also, the antenna 340 receives a signal from which the emitted transmission signal is reflected by an external object. Here, the signal received through the antenna 340, that is, the reflected signal is transmitted to the circulator 342. Meanwhile, the antenna 340 may be composed of one single antenna that transmits and receives a transmission signal and a reflection signal, but is not limited thereto, and the transmission antenna and the reception antenna may be separated.

A circulator 342 may be provided between the transmission module 12, the reception module 16, and the antenna 340. Between the circulator 342 and the receiving module 16, a leakage signal removing module 130 of the leakage signal removing device 100 may be provided.

For example, the circulator 342 may have a first end connected to the transmission module 12, a second end connected to the antenna 340, and a third end connected to the leakage signal removal module 130. The circulator 342 separates the transmission signal from the transmission module 12 and the reflection signal to the reception module 16 to determine the direction of the signal. That is, the circulator 342 supplies the transmission signal supplied from the transmitter 330 to the antenna 340, and supplies the reflected signal received from the antenna 340 to the leakage signal removal module 130. Accordingly, it is possible to prevent the transmission signal from being introduced into the reception module 16 or the reflected signal from the transmission module 12 by the circulator 342. The circulator 342 may be implemented using a Lange coupler, a divider, an isolator, or the like. Meanwhile, a transmission leak signal may be generated while the transmission signal is supplied to the circulator 342. That is, when the transmission signal is supplied to the antenna 340 through the circulator 342, a part of the transmission signal may be leaked to the reception module 16 via the leakage signal removal module 130.

The reception module 16 acquires a reception signal based on the reflected signal output from the circulator 342 of the antenna module 14. Specifically, the reception module 16 obtains a reception signal from which the transmission leakage signal is removed from the reflection signal through the leakage signal removal module 130.

The reception module 16 may acquire a reception signal in which the transmission leakage signal is completely removed, but is not limited thereto, and may be a reception signal including a residual signal.

The reception module 16 may transmit the received reception signal to the leakage signal removal apparatus 100 to update the modulation coefficient. The leakage signal removal apparatus 100 may receive the feedback signal from the reception module 16 and update the modulation coefficient generated to remove the transmission leakage signal included in the reflection signal.

In addition, the reception module 16 transmits the received reception signal to a separate signal processing module (not shown) so that signal processing for detection of the target object is performed.

The coefficient calculation module 110 obtains a first transmission signal for a transmission signal from the transmission module 12 and calculates a modulation coefficient based on initial charging information of the first transmission signal and the transmission leakage signal.

The coefficient calculating module 110 compares / analyzes a transmission leakage signal based on the first transmission signal and the initial charging information to calculate modulation coefficient values of I and Q signals that can cancel leakage noise. The coefficient calculation module 110 updates the I / Q value of the modulation coefficient in which the residual signal included in the received signal is minimized while iterating through the process of feeding back the received signal from which the transmission leakage signal is removed. Perform.

The coefficient calculation module 110 operates a transmission waveform (Frequency sweep bandwidth, Pulse repetition time, Maximum RF delay mismatch, Maximum Loop response time) The difference between the phase or amplitude of the first transmission signal and the transmission leakage signal according to the same) may be stored in a memory (not shown) and used as an initial value of the algorithm.

When the difference value of the phase or the amplitude of the first transmission signal and the transmission leakage signal is stored in the memory (not shown), the time for finding the optimal value of the modulation coefficient at which the residual signal is minimum in the coefficient calculation module 110 is minimized. It is possible to improve the minimum detection distance of the radar detection device 10.

The coefficient calculation module 110 may be implemented by a field programmable gate array (hereinafter referred to as an FPGA) device 350 and a digital-to-analog converter (DAC) 352. The FPGA device 350 is a semiconductor device including a designable logic element and a programmable internal circuit, and may calculate a modulation coefficient in the form of a digital signal using an internal memory. The DAC 352 transforms a modulation coefficient in the form of a digital signal calculated by the FPGA device 350 into an analog signal and transmits it to the modulation module 120.

The modulation module 120 separates the second transmission signal into I and Q signals, and performs amplitude / phase modulation of the second transmission signal based on the modulation coefficient to generate a leakage cancellation signal.

The modulation module 120 amplifies the second transmission signal according to the modulation coefficient calculated by the coefficient calculation module 110, that is, the weight of the I and Q signals, and changes the phase. Here, the modulation module 120 generates a leakage cancellation signal by varying the amplitude and phase of the second transmission signal based on the modulation coefficient, and the generated leakage cancellation signal is a signal having a 180 degree difference from the phase of the transmission leakage signal. desirable.

The leakage signal removal module 130 obtains a reflection signal in which a target reflection signal and a transmission leakage signal are mixed from the antenna module 14, and merges the leakage removal signal and the reflection signal to output a reception signal from which the transmission leakage signal is removed. . The leakage signal removal module 130 transmits the received signal from which the transmission leakage signal has been removed to the reception module 16.

The leakage signal removal module 130 merges the leakage cancellation signal having the same amplitude and a phase out of phase with the transmission leakage signal and the reflection signal to cancel the transmission leakage signal included in the reflection signal.

4 is an exemplary diagram for describing a delay operation for removing a transmission leakage signal according to an embodiment of the present invention.

The modulation module 120 acquires a modulation coefficient and a second transmission signal calculated based on the first transmission signal in order to generate a leakage cancellation signal.

The modulation module 120 acquires each of the modulation coefficient and the second transmission signal through the first path 410 and the second path 420. Here, the first path 410 refers to a path for obtaining a modulation coefficient calculated based on the first transmission signal, and the second path 420 refers to a path for obtaining a second transmission signal.

The leakage signal removal apparatus 100 according to the present embodiment includes a signal delay module 140 so that a modulation coefficient input to the modulation module 120 and a second transmission signal can be input at the same time. Here, the signal delay module 140 performs a time delay in consideration of the time at which the modulation coefficient is calculated by the coefficient calculation module 110. The signal delay module 140 is illustrated as being located inside the transmission module 12, but is not limited thereto. For example, the signal delay module 140 may be implemented in a form located between the transmission module 12 and the modulation module 120.

The signal delay module 140 includes the first time required and the second transmission signal of the first path 410 in which the modulation coefficient calculated using the first transmission signal from the coefficient calculation module 110 is transmitted to the modulation module 120. Performs a time delay to compensate for the time difference such that the second time required of the second path 420 transmitted to the modulation module 120 is the same.

The signal delay module 140 compensates for a time for calculating the modulation coefficient in the coefficient calculation module 110 through a time delay between the first transmission signal and the second transmission signal, thereby canceling the transmission leakage signal (Cancellation Depth (ratio)) Can improve.

5 is a graph showing a result of removing a transmission leakage signal according to an embodiment of the present invention.

FIG. 5 (a) is a graph showing a state in which the transmission leakage signal is not removed, that is, a reflected signal including the transmission leakage signal, and FIG. 5 (b) is a graph showing the reception signal from which the transmission leakage signal is removed.

FIG. 5A shows a signal state that can be confirmed between the antenna module 14 and the leakage signal removal module 130 in the radar detection device 10 of FIG. 3. Meanwhile, FIG. 5 (b) shows a signal state that can be confirmed between the leakage signal removal module 130 and the reception module 16 in the radar detection device 10 of FIG. 3.

6 is a graph showing results of minimizing residual signals according to an embodiment of the present invention.

6A shows a state in which a transmission leakage signal included in a reflection signal is removed by applying a leakage cancellation signal generated using an optimized modulation coefficient. FIG. 6A shows a state in which the transmission leakage signal is minimized and the residual signal is minimized.

In FIG. 6B, an operation of removing a transmission leakage signal included in a reflection signal by applying a leakage removal signal generated using a modulation coefficient is performed, but a residual signal remains in the received signal because the modulation coefficient is not optimized. Indicates. In addition, in FIG. 6C, the transmission leakage signal included in the reflected signal is removed by applying the leakage removal signal generated using the modulation coefficient, but the transmission leakage signal is removed for a long time and the residual signal remains. State.

In order to solve the phenomena such as (b) and (c) of FIG. 6, the leakage signal removing apparatus 100 according to an embodiment of the present invention is based on the initial charging information in the coefficient calculation module 110 for calculating the modulation coefficient The modulation coefficient is updated to calculate an optimized modulation coefficient. In addition, the leakage signal removal apparatus 100 considers the time at which the modulation coefficient is calculated through the signal delay module 140 so that the modulation coefficient input to the modulation module 120 and the second transmission signal can be input at the same time. Perform a time delay. Accordingly, the leakage signal removal apparatus 100 can shorten the signal removal time of the transmission leakage signal and minimize the residual signal included in the received signal.

The above description is merely illustrative of the technical spirit of the embodiments of the present invention, and those skilled in the art to which the embodiments of the present invention pertain may have various modifications and modifications without departing from the essential characteristics of the embodiments of the present invention. Modifications will be possible. Therefore, the embodiments of the present invention are not intended to limit the technical spirit of the embodiments of the present invention, but to explain them, and the scope of the technical spirit of the embodiments of the present invention is not limited by these embodiments. The scope of protection of the embodiments of the present invention should be interpreted by the following claims, and all technical spirits within the equivalent scope should be interpreted as being included in the scope of the embodiments of the present invention.

10: radar detection device 12: transmission module
14: antenna module 16: receiving module
100: leakage signal removal device 110: counting module
120: modulation module 130: leakage signal removal module
140: signal delay module

Claims (12)

In the apparatus for removing the transmission leakage signal from the radar detection apparatus including a transmission module, a reception module and an antenna module,
A coefficient calculation module that acquires a first transmission signal for a transmission signal from the transmission module and calculates a modulation coefficient based on initial charging information of the first transmission signal and the transmission leakage signal;
A modulation module that acquires a second transmission signal for the transmission signal from the transmission module, and modulates the second transmission signal based on the modulation coefficient to generate a leakage removal signal; And
The reflected signal reflected by the target signal is acquired through the antenna module, and the reflected signal and the leak canceling signal are merged to remove the transmitted leak signal included in the reflected signal, and the transmitted leak signal is removed. Leak signal removal module for transmitting the received signal to the receiving module,
Further comprising a time delay module for compensating for a time difference between the first transmission signal and the second transmission signal by performing a time delay for the transmission signal,
The coefficient calculation module calculates the modulation coefficient by using the first transmission signal for the received signal and the transmission signal received from the reception module,
The modulation module, the leakage signal removal apparatus, characterized in that for generating the leakage signal by modulating the time delayed second transmission signal based on the modulation coefficient for time compensation with the first transmission signal. delete According to claim 1,
The time delay module,
Leakage signal removal device, characterized in that to compensate for the time difference between the first transmission signal and the second transmission signal located in the transmission module or between the transmission module and the modulation module. According to claim 1,
The time delay module
Compensating for the time difference such that the first time required for the second transmission signal to be transmitted to the modulation module and the second time required for the modulation coefficient calculated using the first transmission signal to be transmitted to the modulation module are the same. Leakage signal removal device, characterized in that. According to claim 1,
The coefficient calculation module,
If the transmission signal is a continuous waveform (CW Type), the leakage signal removal apparatus, characterized in that for calculating the modulation coefficient using the initial charge information for the first transmission signal and the initial transmission leakage signal. According to claim 1,
The coefficient calculation module,
When the transmission signal is a frequency modulation continuous waveform (FMCW Type), the modulation coefficient is calculated using the initial charging information for the first transmission signal and the initial transmission leakage signal, and the feedback signal is fed back to receive the modulation coefficient Leakage signal removal device characterized in that it is updated. The method of claim 6,
The coefficient calculation module,
Leakage signal removal apparatus characterized by updating the modulation coefficient so that the residual signal included in the received signal is minimized by repeatedly receiving the received signal. According to claim 1,
The coefficient calculation module,
And measuring the transmission leakage signal with respect to the transmission signal, and obtaining the initial charging information including amplitude and phase information of the transmission leakage signal to calculate the modulation coefficient. According to claim 1,
The modulation module,
The amplitude and phase of the second transmission signal are varied according to the I signal value and the Q signal value included in the modulation coefficient to generate the leakage cancellation signal, and the phase of the leakage cancellation signal is the transmission leakage included in the reflection signal. Leakage signal canceling device characterized in that the signal is variable so as to cancel. A method for removing a transmission leakage signal from a radar detection device including a transmission module, a reception module, an antenna module, and a leakage signal removal device,
Obtaining a first transmission signal for a transmission signal from the transmission module;
Calculating a modulation coefficient based on initial charging information of the first transmission signal and the transmission leakage signal;
Obtaining a second transmission signal for the transmission signal from the transmission module;
Modulating the second transmission signal based on the modulation coefficient to generate a leakage cancellation signal;
Obtaining a reflected signal from which the transmitted signal is reflected by a target object through the antenna module; And
And removing the transmission leakage signal included in the reflection signal by combining the reflection signal and the leakage removal signal, and transmitting the reception signal from which the transmission leakage signal is removed to the reception module,
Further comprising the step of performing a time delay for the transmission signal, to perform a time delay to compensate for the time difference between the first transmission signal and the second transmission signal,
In the calculating of the modulation coefficient, the modulation coefficient is calculated using the received signal received from the receiving module and the first transmission signal for the transmission signal,
In the generating of the leakage removal signal, the leakage signal is generated by modulating the second transmission signal delayed in time based on the modulation coefficient to compensate for time with the first transmission signal. How to remove. delete The method of claim 10,
The step of performing the time delay,
Compensating for the time difference such that the first time required for the second transmission signal to be transmitted to the modulation module and the second time required for the modulation coefficient calculated using the first transmission signal to be transmitted to the modulation module are the same. Method for removing the leakage signal, characterized by.

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