KR20050054156A - Radar detector using multiplier with the variable multiple frequency with respect to input signal. - Google Patents

Abstract

The present invention relates to a radar detector, and more particularly, to a radar detector using a new multiplication circuit that can vary the multiplication constant of the output frequency with respect to the input frequency in order to improve the sensitivity performance of the product. It is about.

Conventionally, a single band oscillator is used to detect multiband signals in the X-band (10.525 GHz), K-band (24.150 GHz), and Ka-band (34.7 GHz ± 1.3 GHz) input through the antenna unit. Although the signal is detected, there is a problem that the reception capability of the K and Ka bands is degraded. In order to solve this problem, a method of using two or three secondary local oscillation circuits has been proposed. However, there are limitations in performance improvement, and there are other methods of configuring two primary local oscillation circuits. As a result, there is a problem of productivity in parts prices and mass production.

Therefore, in the present invention, a multiplier which varies the applied bias voltage so that the output frequency of the multiplication circuit generates a signal having a variable integer multiple with respect to the frequency input to the multiplication circuit is applied to the X-band (10.525 GHz) and the K-band. (24.150GHz), Ka-band (34.7 GHz ± 1.3 GHz) improves the conversion loss characteristics of the primary mixer section to minimize the signal loss of the microwave module to improve the radar detector reception sensitivity performance in multiple bands. It also aims to produce low cost and stable products.

Description

Radar detector using multiplier having variable integer multiple output frequency characteristics of input signal {Radar detector using multiplier with the variable multiple frequency with respect to input signal.}

The present invention relates to a radar detector designed to derive improved performance than a conventional radar detector along with a low-cost product implementation by applying a new multiplier to a radar detector.

Radar Detector is a system that detects laser or microwave signals shot by a speed gun to measure the speed of a moving vehicle and informs the driver through beeps, voices, and texts. In addition, several types of products using Ka-band signals or lasers have been developed and used for safe driving of vehicles.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an explanatory view for explaining the principle of use of a radar detector, and the configuration and operation of a general radar detector will be described with reference to the drawings. Certain bands such as the X-band (10.525 GHz), K-band (24.150 GHz), Ka-band (34.7 GHz ± 1.3 GHz), infrared rays and VG-2 to detect the radar detector It is used to maintain safe driving of the vehicle by providing various driving information to the driver by encoding various information signals such as railroad crossings, fog areas, speed reductions, etc.

The radar detector for the above purpose is a microwave module 110 for converting the X, K, Ka band frequencies belonging to the ultra-high frequency region into RF frequencies and the RF module for converting RF frequencies to IF frequencies as shown in FIG. 120) and a baseband module 130 that performs signal processing after demodulating the converted IF frequency. Details are as follows.

As shown in Figure 2a and the antenna unit 111 for receiving an ultra-high frequency signal; A primary local oscillator 113 for generating a frequency component generated for the operation of the mixer circuit; A primary mixer 112 for mixing the ultra-high frequency signals received from the antenna unit with a frequency generated in the primary local oscillator to convert the RF signals into RF frequencies; An amplifier 121 for amplifying the RF frequency converted by the primary mixer; A secondary mixer unit 122 for converting the amplified RF frequency signal into an IF frequency; A secondary local oscillator 124 for generating a frequency signal required for the secondary mixer 122; A secondary filter unit 123 for obtaining only a specific band signal of an IF frequency signal among the output signals converted by the secondary mixer unit 122; A demodulator 131 for A / D converting an IF frequency signal filtered to a specific band through the secondary filter unit 123; The signal processing controller 132 is configured to receive and process the demodulated signal and to perform appropriate control of each component. A laser detection circuit for detecting a laser may be added to the configuration.

In the microwave module 110, the RF frequency may convert the X and K band frequency signals into RF frequencies by calculating fLO-X band and K band-2 × LO, and fLO is the output frequency of the first local oscillation circuit. It means.

Figure 2b shows the distribution of the output frequency components of the primary local oscillator 113 generated by the method as shown in Figure 2a to convert the K band (24.150GHz) and Ka band (34.7GHz ± 1.3GHz) into RF signals to the first mixer unit mothayeo not convert the K-band (24.150GHz) and Ka band (34.7GHz ± 1.3GHz) signal due to (112) 2 × f _LO and there is little signal level of 3 × f _LO input to an RF signal Performance is degraded.

As shown in FIG. 3A, a method of receiving Ka bands using two or three secondary local oscillators 124 used in the RF module 120 is performed, but the performance of the microwave module 110 is not good. There are some disadvantages. As another method, as shown in FIG. 3B, two primary local oscillators 113 used for the microwave module 110 are configured for Ka band frequency conversion, but the output frequency of the primary local oscillator 113 is high. As a result, the parts are expensive, the reliability of the circuit is reduced, and the size of the product is increased.

The present invention is to solve the above problems by varying the bias voltage applied to the microwave module 110 so that the output frequency of the multiplication circuit to generate a frequency signal having a variable integer multiple with respect to the frequency input to the multiplication circuit X-band (10.525 GHz), K-band (24.150 GHz), Ka-band using one primary local oscillator 115 having a lower oscillation frequency than conventionally applied primary local oscillator 113 by applying allocation Radar detector in the X band, K band and Ka band by minimizing the signal loss of the microwave module 110 by improving the conversion loss characteristic of the primary mixer 112 at (34.7 GHz ± 1.3 GHz) Its purpose is to improve the receiver's sensitivity and to produce low cost and stable products.

The present invention is the antenna module 111 for receiving the microwave module 110, the microwave signals as shown in Figure 4a; A primary mixer unit 112 having an SHP structure of an SMD (Surface Mount Device) type; A primary local oscillator 115 for generating a frequency signal necessary for the operation of the mixer; The multiplier 116 is configured to generate an output frequency signal having a variable integer multiple with respect to a frequency at which the output frequency of the multiplication circuit is input to the multiplication circuit by varying the bias voltage.

The multiplication unit 116 generating a frequency signal having a variable integer multiple with respect to the frequency at which the output frequency is input to the multiplication circuit is a passive element (Varactor, Schottky, SRD diode) or an active element (BJT series, FET series, PHEMT). By varying the bias voltage of the constructed circuit, the nonlinear transfer function of the nonlinear elements generated in the circuit can be changed to obtain an output frequency of a variable integer multiple corresponding to one, two, and three times the input frequency. Figure 4b shows the distribution of the frequency components input to the first mixer section 112 at the output of the multiplier 116 when the multiplier 116 is applied, X-band (10.525 GHz), K-band (24.150 since GHz) and Ka- band (34.7GHz ± 1.3GHz) in order to convert the RF signal to the first mixer (112) fLO, 2 × f LO and 3 × f _LO signal level is sufficiently large for input to the X- Band (10.525 GHz), K-band (24.150 GHz) and Ka-band frequency (34.7 GHz ± 1.3 GHz) signals can be converted to RF frequencies with low conversion loss.

As described above, the primary local oscillator 115 having a single output generates an oscillation frequency and inputs the multiplication constant of the output frequency with respect to the input frequency to the multiplication unit 116 that can vary, and the nonlinear element of the multiplication unit 116. In order to vary the nonlinear propagation characteristics, a control voltage (Tuning Voltage) input to the primary local oscillator 115 is used. The multiplied output frequency components generated by such a circuit configuration are input to the primary mixer section 112 composed of SMD (Surface Mount Device) type SHP structure, and the X-band (10.525 GHz), K-band (24.150 GHz) and the like. In the Ka-band (34.7 GHz ± 1.3 GHz) it is possible to minimize the conversion loss of the primary mixer 112 to improve the signal reception sensitivity characteristics of the radar detector (Radar Detector).

Since the present invention can reduce the signal loss of the microwave module 110 compared to the method shown in FIG. 2a, it is possible to implement excellent reception sensitivity and generate lower frequency when compared to the method shown in FIG. 3b. Since the second local oscillator 113 is used, a radar detector having excellent reception sensitivity can be implemented by using stable and inexpensive components.

As described above, the multiplication unit for varying the bias voltage to generate an output frequency signal having a variable integer multiple with respect to the frequency inputted to the multiplication circuit is applied to a radar detector. It can improve the product reception sensitivity more effectively than the method used, and it can reduce the price of the product by using general-purpose parts that can be used at low frequencies, and solve the productivity problem that may occur at the time of mass production. There is.

1 is an exemplary view for explaining a general radar detector (Radar Detector) product.

Figure 2a, 2b is an exemplary view for explaining the general configuration of a conventional radar detector (Radar Detector).

3A and 3B are exemplary views for explaining a method used for detecting a conventional Ka band.

4A and 4B are views for explaining a radar detector proposed in the present invention.

<Explanation of symbols for the main parts of the drawings>

110: microwave module 111: antenna unit

112: primary mixer 113, 115: primary local oscillator

116: body part 120: RF module

121: amplification unit 122: secondary mixer unit

123: filter unit 124: secondary local oscillation unit

130: baseband module 131: demodulation unit

132: signal processing controller

Claims (2)

Microwave module 110 as a radar detector for detection of high frequency signal components such as X-band (10.525 GHz), K-band (24.150 GHz), Ka-band (34.7 GHz ± 1.3 GHz) An antenna unit 111 for receiving ultra-high frequency signals; A primary mixer unit 112 having an SHP structure of an SMD (Surface Mount Device) type; A primary local oscillator 115 for generating a frequency signal necessary for the operation of the mixer; A radar detector composed of a multiplication unit 116 for varying a bias voltage so as to generate a frequency signal having a variable integer multiple with respect to a frequency at which an output frequency of a multiplication circuit is input to a multiplication circuit. The method of claim 1 The multiplier is a radar detector having a circuit configured by changing the bias voltage of the circuit consisting of passive elements (Varactor, Schottky, SRD diode) or active elements (BJT series, FET series, PHEMT).