JP5235728B2 - Guidance device - Google Patents

Description

  The present invention is mounted on a flying object that is guided and controlled toward a target, transmits and receives radio waves, analyzes a received signal, detects a target signal to be tracked, and guides the flying object toward the target. It is related with the guidance device which performs.

  When guiding the flying object toward the target, the target distance information, speed information, and angle information are extracted from the signals observed by the guidance device mounted on the flying object, and the guidance signal is obtained from the obtained information. Is calculated, and the steering angle is controlled.

  As an example of such a guidance device, a transmitter that amplifies radio waves transmitted toward a target, an antenna that transmits and receives radio waves toward a space, a digital that can receive a reflected signal from a target and analyze the received reflected signal The front end that performs conversion processing to the signal and the receiving unit, the excitation unit that generates a periodic signal required in the transmitting unit and the receiving unit, and the target detection processing are performed on the received signal, and distance information and angle information are obtained from the detected target signal. There is known a guidance device that includes a signal processing unit to obtain and guides a flying object toward a target (see, for example, Patent Document 1).

JP 2001-108742 A

  A conventional guidance device detects and tracks a target signal by transmitting a radio wave toward the target and receiving a signal reflected from the target. However, targets such as stealth aircraft are difficult to detect at long distances because the RCS is very small. In addition, since the distance from the detection to the meeting is shortened, it is necessary to improve the tracking accuracy. As a countermeasure, there is a method of improving the detection and tracking performance of a small RCS target by using a plurality of guidance devices having different transmission / reception frequency bands and making use of the characteristic differences between the propagation characteristics and reflection characteristics of signals in each frequency band. In that case, a plurality of excitation units, transmission units, circulators, front ends, and reception units, which are components of the guidance device, are required, which increases the size and makes it difficult to mount the flying device.

  The present invention has been made to solve such a problem, and when transmitting a radio wave having a frequency of a plurality of bands to improve the performance of dealing with a small RCS target, the transmission / reception of the transmitter / receiver is suppressed. An object of the present invention is to provide a guidance device that can be mounted on a scale.

  A guidance device according to the present invention is a guidance device for guiding a mounted flying vehicle to a target by transmitting radio waves of two frequencies respectively included in two bands to the target. A common excitation unit for generating a high-band transmission signal having a frequency obtained by adding the frequency of the IF signal to the frequency of the local oscillation signal and a low-band transmission signal having the same frequency as that of the IF signal; A high-band front end that down-converts the high-band reception signal obtained by receiving the high-band transmission signal reflected back from the target by the local signal, and the down-converted from the high-band front end. The high-band received signal and the low-band transmitted signal reflected by the target are received and received. A common receiver for the low-band reception signal is input, with a.

  According to the guidance device according to the present invention, in order to detect a small RCS target, a radio wave having two frequencies respectively included in two frequency bands is transmitted, and two radio waves reflected by the target are received and processed. In the apparatus, the two radio waves to be transmitted are down-converted by the local oscillation signal so that the frequencies are the same. Therefore, the systems for transmitting and receiving can be shared, and the size can be reduced.

It is a block diagram which shows the structure of the guidance device which concerns on Embodiment 1 of this invention. It is a figure for demonstrating a mode that the down conversion in a high band front end is carried out. It is a block diagram which shows the structure of the guidance device which concerns on Embodiment 2 of this invention. It is a figure for demonstrating a mode that the down-conversion in an even harmonic mixer and a mixer is carried out.

Embodiment 1 FIG.
FIG. 1 is a configuration diagram showing the configuration of the guidance device according to Embodiment 1 of the present invention. Although various components and devices are provided in the guidance device shown in the figure, only the part which is the gist of the present invention will be described here. In order to simplify the description, an example in which a two-band induction device is combined will be described.

The common excitation unit 11 excites a local oscillation signal (frequency is f _L ) and an IF signal (frequency is f _IF ). In addition, the common excitation unit 11 uses the local signal and the IF signal, and the high-band transmission signal whose frequency f _txH satisfies the equation (1) and the low band where the frequency f _txL satisfies the equation (2) using the IF signal. A transmission signal is generated. The common excitation unit 11 also sends a high-band transmission signal to the high-band transmission unit 9, a low-band transmission signal to the low-band transmission unit 10, a local signal to the high-band front end 6, and a coherent oscillator (COHO) signal to the common reception unit. 7 respectively.

The high band transmission unit 9 amplifies the high band transmission signal input from the common excitation unit 11 and inputs it to the high band circulator 4 of the antenna unit 1.
The low band transmission unit 10 amplifies the low band transmission signal input from the common excitation unit 11 and inputs the amplified low band transmission signal to the low band circulator 5 of the antenna unit 1.
The high-band circulator 4 and the low-band circulator 5 output the input high-band transmission signal and low-band transmission signal to the 2-band antenna 2 via the comparator 3, respectively.
The two-band antenna 2 of the antenna unit 1 radiates the input high-band transmission signal and low-band transmission core signal to the target.

In addition, the 2-band antenna receives a reflected wave from a target (hereinafter referred to as a received signal, receives a reflected wave of a high-band transmission signal, receives a reflected wave of a high-band transmission signal, and a low-band transmission signal) The obtained signal is used as a low-band received signal), and the high-band received signal and the low-band received signal are output to the high-band circulator 4 and the low-band circulator 5, respectively.
The high band circulator 4 outputs the input high band reception signal to the high band front end 6.
The high band front end 6 down-converts the high band reception signal into an IF reception signal and outputs the IF reception signal to the common reception unit 7.
The low-band circulator 5 outputs the input received signal as it is to the common receiving unit 7. Here, the high-band circulator 4 and the low-band circulator 5 output only the input high-band transmission signal and the low-band transmission signal so as to radiate from the two-band antenna 2, respectively, and the high-band circulator 4 and the low-band circulator 5 The reception signal and the low band reception signal are output to the high band front end 6 and the common reception unit 7, respectively.

The common reception unit 7 generates a video signal by performing band limitation, amplification, down-conversion, and the like on the input reception signal, and outputs the generated video signal to the signal processing unit 8.
The signal processing unit 8 determines that there is a target when the S / N exceeds the reference with respect to the input video signal, tracks the detected target, and outputs a signal for guidance.

High band transmit signal, the relationship of the frequency f _IF and expressions frequency f _L and IF signal of a frequency f _TXH is local oscillator signal (1) is satisfied, the high band high band transmission signal is reflected and returned by the target As shown in FIG. 2, the received signal has a frequency f _{rfH obtained} by adding the frequency f _{IF of the} IF signal to the frequency f _L of the _local signal. For this reason, when the high-band front end 6 down-converts with a local oscillation signal, it is converted into a high-band output IF signal of frequency f _IF .
Since the frequency f _{txL of the} low-band transmission signal has the relationship of the frequency f _{IF of the} IF signal and the expression (2), the low-band transmission signal reflected from the low-band transmission signal at the target is returned as shown in FIG. The frequency f _rfL becomes the frequency f _IF . For this reason, the low-band received signal received by the 2-band antenna 2 is directly input to the common receiver 7 as a low-band output IF signal.

Since the frequency f _IF of the high-band reception signal the high-band output IF signal after the down-converted by the high-band front-end 6 is the same as the frequency f _IF of the low-band output IF signal, low-band front-end is not required It is possible to commonly use the common receiving unit 7 that converts the frequency into I, Q video signals and the common excitation unit 11 that generates the IF signal and the local oscillation signal.

  In the guidance device according to Embodiment 1 of the present invention, even in the case of having a two-band guidance device together in order to capture a small Radar Cross Section (RCS) target, a configuration in which two components are completely arranged Since there are components that can be deleted and components that can be used in common, downsizing is possible.

Embodiment 2. FIG.
FIG. 3 is a configuration diagram showing the configuration of the guidance device according to Embodiment 2 of the present invention. Although various components and devices are provided in the guidance device shown in the figure, only the part which is the gist of the present invention will be described here. In order to simplify the description, an example in which a two-band induction device is combined will be described.

The guidance device according to the second embodiment of the present invention is different from the guidance device according to the first embodiment of the present invention in the common excitation unit 11B and the common front end 12, and the other parts are the same. Is added.
The common excitation unit 11B excites a local oscillation signal (frequency is f _L ) and an IF signal (frequency is f _IF ). Further, the common excitation unit 11B uses the local oscillation signal and the IF signal, and the frequency f _txL satisfies the equation (3) using the high band transmission signal, the local oscillation signal, and the IF signal that _{satisfy the} equation (3). A low-band transmission signal that satisfies the above is generated. The common excitation unit 11B also sends a high-band transmission signal to the high-band transmission unit 9, a low-band transmission signal to the low-band transmission unit 10, a local oscillation signal to the common front end 12, and a coherent oscillator (COHO) signal to the common reception unit 7 Respectively.

  The common front end 12 includes an even harmonic mixer 13 that down-converts the high-band received signal and converts it into an intermediate-frequency high-band received signal, a mixer 14 that down-converts the low-band received signal and converts it into an intermediate-frequency low-band received signal, Output IF signal path switching switch 15 for selecting and outputting either the high frequency band received signal or the intermediate frequency low band received signal, and the local signal path switching for supplying the local oscillator signal to either the even harmonic mixer 13 or the mixer A switch 16 is provided.

FIG. 4 is a diagram for explaining the down-conversion in the even harmonic mixer 13 and the mixer 14.
Even harmonic mixer 13, the output difference between twice the frequency _{f L} of the local oscillation signal with the frequency _{f RFH} high band reception signals input to _(f rfH -2f _L) as the frequency of the intermediate frequency high-band reception signal To do. The even harmonic mixer 13 receives a high-band received signal having a frequency (2f _L + f _IF ) that is twice as large as the frequency f _L of the local oscillation signal by the frequency f _{IF of} the IF signal. outputs a high-band output IF signal of the same frequency as f _IF.
The mixer 14 outputs a low-band output IF signal whose frequency is the difference (f _rfL −f _L ) between the frequency f _rfL of the input low-band received signal and the frequency f _L of the _local oscillation signal. And, since the mixer 14 low-band reception signal of frequency _{f IF} by large frequency of the IF signal from the frequency _{f L} of the local oscillation signal _(f L _{+ f IF)} is input, the same frequency as the frequency _{f IF} of the IF signal low band Output IF signal.

In this way, the frequency f _txH of the high-band transmission signal is set so as to satisfy the expression (3) and the frequency f _txL of the low-band transmission signal satisfies the expression (4), and the high-band reception signal is converted by the even harmonic mixer 13. By doing so, it is possible to make the receiving unit for converting the intermediate frequency received signal into the video signal common to the high band received signal and the low band received signal.
In addition, since the high-band transmission signal and the low-band transmission signal are generated from the local signal and the IF signal, an excitation unit that excites the high-band transmission signal and the low-band transmission signal can be shared.

  Since the guidance device according to the second embodiment of the present invention is configured as described above, even when a two-band guidance device is used together to capture a small RCS target, two components are completely arranged. Since there are components that can be shared with respect to the configuration, downsizing is possible.

  1 antenna part, 2 2-band antenna, 3 comparator, 4 high-band circulator, 5 low-band circulator, 6 high-band front end, 7 common receiver, 8 signal processor, 9 high-band transmitter, 10 low-band transmitter, 11, 11B common excitation part, 12 common front end, 13 even harmonic mixer, 14 mixer, 15 output IF signal path switch, 16 local signal path switch.

Claims (2)

In a guidance device that guides the mounted flying object to the target by sending radio waves of two frequencies included in the two bands to the target,
A high-band transmission signal having a frequency obtained by exciting the local oscillation signal and the IF signal and adding the frequency of the IF signal to the frequency of the local oscillation signal and a low-band transmission signal having the same frequency as the IF signal are generated. A common exciter to
A high-band front end that down-converts the high-band reception signal obtained by receiving the high-band transmission signal reflected and returned by the target with the local oscillation signal;
The down-converted high-band reception signal output from the high-band front end and the low-band reception signal obtained by receiving the low-band transmission signal that is returned from the low-band transmission signal reflected from the target are input. A common receiver,
A guidance device comprising: In a guidance device that guides the mounted flying object to the target by sending radio waves of two frequencies included in the two bands to the target,
A high-band transmission signal having a frequency obtained by exciting the local oscillation signal and the IF signal and adding the frequency of the IF signal to twice the frequency of the local oscillation signal and the frequency of the IF signal to the frequency of the local oscillation signal A common excitation unit that generates a low-band transmission signal having a frequency obtained by adding
An even harmonic mixer that down-converts the high-band received signal obtained by receiving the high-band transmission signal reflected and returned from the target using the local oscillation signal, and the low-band transmission signal that is reflected and returned by the target. A common front end having a mixer for down-converting a low-band received signal obtained by reception with the local oscillation signal;
A common reception unit to which the down-converted high-band reception signal and the low-band transmission signal output from the common front end are input;
A guidance device comprising:

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