KR100864506B1 - Multiple frequency radar detector - Google Patents

Abstract

A multiple frequency radar detector is provided to reduce the size and cost by embedding secondary mixers, secondary oscillators, and a frequency synthesizer in one IC(Integrated Circuit). A multiple frequency radar detector includes an RF(Radio Frequency) module(200). The RF module includes a low-noise amplifier(210), a plurality of first band pass filters(220,221,222), a plurality of local oscillators(231,232,233), a plurality of mixers(234,235,236), and a second band pass filter(240). The low-noise amplifier amplifies multiple radio frequency signals received from an MW(Microwave) module and outputs the amplified signals. The first band pass filters classify the multiple radio frequency signals outputted from the low-noise amplifier according to frequencies. The local oscillators generate local oscillation signals for the multiple radio frequency signals passing through the first band pass filters. The mixers mix the multiple radio frequency signals passing through the first band pass filters and the local oscillation signals generated from the local oscillators to output frequency-converted signals. The second band pass filter passes only the signal having an intermediate frequency among the frequency-converted signals outputted from the mixers to transmit the signal to a BB(Baseband) module. The local oscillators and the mixers are embedded in one IC(230).

Description

Multiple Frequency Radar Detector

1 is an exemplary view for explaining the configuration of a general radar detector,

Figure 2 is an exemplary view for explaining the operation of the general radar detector,

3A, 3B, and 3C are exemplary views for explaining a method used in the radar detector according to the prior art, and

4 is an exemplary diagram for explaining a circuit configuration of a radar detector RF module according to the present invention;

<Explanation of symbols for main parts of the drawings>

200: RF (Radio Frequency) module 210: low noise amplifier

220, 221, 222: band pass filter 230: integrated circuit

231, 232, 233: oscillator 234, 235, 236: mixer

237 frequency synthesizer 240 band pass filter

250: control unit

The present invention relates to a radar detector in which a new radio frequency (RF) module is applied to a radar detector.

Radar Detector detects the beep, voice and text by detecting X-band, K-band, Ka-band signal or laser signal used by Speed Gun to measure the speed of moving vehicle. It is a system that informs the driver through the use of some developed countries for the safe operation of the vehicle.

1 is a view illustrating a configuration of a general radar detector, and converts microwave signals of X-band, K-band, and Ka-band into RF (Radio Frequency) frequency signals. ) Module 100, RF (radio frequency) module 200 for converting an RF frequency signal into an intermediate frequency (intermediate frequency) signal, and BB (base) for demodulating the IF frequency signal for signal processing band, baseband) module 300 is configured. The MW module 100 includes an antenna 101 for receiving ultra-high frequency signals in the X-band, K-band, and Ka-band, a primary local oscillator 103 for generating a specific frequency, and an antenna from the antenna 101. It consists of a primary mixer 102 for mixing the received ultra-high frequency signals with the frequency generated by the primary local oscillator 103 and converts it into an RF frequency signal. The RF module 200 includes an amplifier 201 for amplifying the RF frequency signal converted by the primary mixer 102, a secondary mixer 202 for converting the amplified RF frequency signal into an IF frequency signal, Multiple secondary local oscillator 204 for generating the local oscillation signal required for the secondary mixer 202 and secondary for obtaining only a specific band signal of the IF frequency signal among the output signals converted through the secondary mixer 202. It consists of a filter 203. The BB module 300 includes a demodulator 301 for A / D converting an IF frequency signal selected only for a desired band through the secondary filter 203, and receives and processes the demodulated signal and appropriately applies each component. And a signal processing controller 302 for performing control. A laser detection circuit for detecting a laser may be added to the above configuration.

2 is for explaining the operation of the MW (microwave) module 100 and the radio frequency (RF) module 200, the primary mixer 102 is the X-band (10.525GHz) input to the antenna 101 RF frequency signal by mixing the K-band (24.150 GHz) and Ka-band (33.64 GHz) ultra-high frequency signals with the oscillation frequency (10.9 GHz-11.4 GHz) generated by the primary local oscillator 103 (550MHz, 1550MHz, 2085MHz), and the RF (radio frequency) module 200 amplifies the input multiple RF frequency signals (550MHz, 1550MHz, 2085MHz) through the amplifier 201. RF module 200 also includes amplified multiple RF frequency signals (550 MHz, 1550 MHz, 2085 MHz) and multiple local oscillation signals (560.7 MHz, 1560.7 MHz, 2095.7 MHz) generated from multiple secondary local oscillators 204. After mixing in the secondary mixer 202 converts to an IF frequency signal (10.7MHz) and serves to send to the base band (BB) module 300 through the secondary filter 203.

Conventionally, as shown in FIGS. 3A, 3B, and 3C, the radio frequency (RF) module 200 includes an amplifier 201, a secondary mixer 202, and a multiple secondary local oscillator 204 with a large number of active components. Because of the passive components, there is a problem that the high price and the size of the RF (radio frequency) module 200 increase, and a single amplifier 201 amplifies an RF frequency signal (550MHz, 1550MHz, 2085MHz) and Since the second mixer 202 mixes multiple RF frequency signals 550 MHz, 1550 MHz, and 2085 MHz, the gain is degraded and the performance is degraded.

In addition, due to the deformation of the coil and chip inductor used to generate the stable local oscillation signal of the multiple local oscillation signals (560.7 MHz, 1560.7 MHz, 2095.7 MHz) generated in the multiple secondary local oscillator 204, Due to the variation, the production efficiency is lowered because a tuning operation of the coil inductor is required during the production process.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and includes an integrated circuit including a secondary mixer, a secondary oscillator circuit, and a frequency synthesizer capable of independently processing multiple RF frequency signals. Radio frequency (RF) module using a bandpass filter and a low noise amplifier to the radar detector to maximize sensitivity, miniaturization, low cost, and production efficiency in converting multiple RF frequency signals to IF frequency signals. The objective is to develop a radar detector.

In order to achieve the above object, the RF module of the multi-frequency laser detector according to the present invention, a low noise amplifier for amplifying and outputting a multi-wave signal from the MW module; A plurality of first band pass filters for classifying the multiple propagated signals output from the low noise amplifier according to frequency; A plurality of local oscillators for generating a local oscillation signal for the radio signal passing through each first band pass filter; A plurality of mixers for mixing a radio wave signal passed through each first band pass filter and a local oscillation signal generated in each local oscillator to output a frequency converted signal; And a second band pass filter configured to pass only a signal whose frequency is the frequency of the intermediate frequency signal among the frequency-converted signals output from the plurality of secondary mixers and transmit the signal to the BB module, wherein the plurality of local oscillators and the plurality of mixers It is characterized in that it is embedded in one integrated circuit.

The RF module generates a control frequency signal for changing the frequencies of the local oscillation signals of the plurality of local oscillators based on the frequencies of the modulated frequency signals output from the plurality of mixers, applies them to the plurality of local oscillators, and is embedded in the integrated circuit. It may further comprise a frequency synthesizer.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

The multi-frequency radar detector according to the present invention receives a multi-microwave signal of the X-band, K-band, Ka-band, etc. and converts it into a multi-frequency (radio frequency) signal having different frequencies. Module 100, a radio frequency (RF) module 200 for converting multiple radio signals into an intermediate frequency signal, and a baseband (BB) module 300 for demodulating and processing an intermediate frequency signal. It is. The configuration of the MW module 100 and the BB module 300 is the same as the multi-frequency radar detector according to the prior art shown in Figure 1, the detailed description thereof is omitted.

4 is an exemplary diagram for explaining a circuit configuration of the RF module 200 of the multi-frequency radar detector according to the present invention.

Referring to FIG. 4, a radio frequency (RF) module 200 includes a low noise amplifier 210 for receiving and amplifying multiple RF frequency signals from the MW module 100 of FIG. 1; Bandpass filters 220, 221, and 222 for canceling interference between multiple RF frequency signals; An integrated circuit 230 in which the secondary oscillators 231, 232, 233, the secondary mixers 234, 235, 236, and the frequency synthesizer 237 are embedded; A bandpass filter 240 for transmitting only the IF signal to the BB module (300 in FIG. 1); The controller 250 is configured to control the operation of the integrated circuit 230.

As described by way of example in the description of the prior art, a 550 MHz RF signal for the X-band, a 1550 MHz RF signal for the K-band, and a 2085 MHz RF signal for the Ka-band are RF from the MW module 100. It is delivered to the low noise amplifier 210 of the module 200. The low noise amplifier 210 suppresses noise components included in the input multiple RF signals 550MHz, 1550MHz, and 2085MHz and amplifies the signal components.

Multiple RF signals (550 MHz, 1550 MHz, 2085 MHz) amplified by the low noise amplifier 210 are classified by band pass filters 220, 221, 222. For example, band pass filter 220 passes a 550 MHz RF signal (for an X-band signal) and no other frequency signal, and band pass filter 221 a 1550 MHz RF signal (for a K-band signal). ) And no other frequency signal, and band pass filter 222 passes a 2085 MHz RF signal (for Ka-band signal) and no other frequency signal. Thus, the band pass filters 220, 221, 222 eliminate the interference and interference signal components that may occur between the multiple RF signals (550 MHz, 1550 MHz, 2085 MHz) passing through the low noise amplifier 210.

The RF signal passed through each band pass filter 220, 221, 222 and the local oscillation signal oscillated from each of the secondary oscillators 231, 232, 233 embedded in the integrated circuit 230 are integrated circuit 230. In each of the secondary mixers 234, 235, 236 embedded therein. For example, the 550 MHz RF signal passed through the band pass filter 220 is mixed with the 560.7 MHz local oscillation signal oscillated by the secondary oscillator 231 and the secondary mixer 234 and converted into the 10.7 MHz and 1110.7 MHz signals. do. In the case of the 1550 MHz RF signal passing through the band pass filter 221, the 1560.7 MHz local oscillation signal oscillated by the secondary oscillator 232 and the secondary mixer 235 are mixed and converted into 10.7 MHz and 3110.7 MHz signals. In the case of the 2085 MHz signal passing through the band pass filter 222, the 2095.7 MHz local oscillation signal oscillated by the secondary oscillator 233 and the secondary mixer 236 are mixed and converted into 10.7 MHz and 4180.7 MHz signals. Thus, the integrated circuit 230 incorporating the secondary oscillators 231, 232, 233 and the secondary mixers 234, 235, and 236 converts multiple RF signals (550 MHz, 1550 MHz, 2095.7 MHz signals in this embodiment) into IF signals. (10.7 MHz signal in this embodiment).

The band pass filter 240 passes the IF signal (10.7 MHz) among the signals converted by the integrated circuit 230 including the secondary oscillators 231, 232, and 233 and the secondary mixers 234, 235, and 236. Eliminate unwanted interference signals of other frequencies. The IF signal (10.7 MHz) passing through the band pass filter 240 is transmitted to the BB module 300 of FIG.

The integrated circuit 230 may further include a frequency synthesizer 237. The frequency synthesizer 237 compares the reference signal (10.7 MHz) with the signals output from the secondary mixers 234, 235, and 236, generates a control signal based on the comparison result, and converts the control signal into a secondary oscillator ( 231, 232, 233). The local oscillation signal output from the secondary oscillators (231, 232, 233) deviates from 560.7 MHz, 1560.7 MHz, or 2095.7 MHz, which causes the converted signal output from the secondary mixers (234, 235, 236) to the intermediate frequency (10.7 MHz). Even if the lateral oscillator deviates, the secondary oscillator can generate stable local oscillation signals (560.7 MHz, 1560.7 MHz, 2095.7 MHz) by control by the frequency synthesizer 237 and the secondary mixers 234, 235, 236 It can output a stable IF signal (10.7MHz) and does not require tuning the coil inductor.

As described above, an RF (radio frequency) module is applied to a radar detector using an integrated circuit including a secondary mixer, a secondary oscillator circuit, and a frequency synthesizer, a band pass filter, and a low noise amplifier. Unlike the conventional method, since multiple RF frequency signals are processed independently, the signal gain can be increased compared to the conventional method of processing multiple RF frequency signals with one secondary mixer. Because of the use of an integrated circuit with a built-in secondary oscillator circuit and a frequency synthesizer, it is possible to miniaturize and reduce the cost compared to the conventional method of constructing a radio frequency (RF) module with a large number of active and passive components. Coil inductors were used because they generate multiple local oscillation signals by using It is possible to generate a more stable local oscillation signal than the conventional method, there is no need for the tuning (tuning) during the production process has the effect of improving the production efficiency.

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it will be readily apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the invention, and all such changes and modifications are It is obvious that it belongs to the scope of the appended claims.

Claims (2)

MW (microwave) module 100 for receiving multiple microwave signals, such as X-band, K-band, Ka-band, and converts them into radio frequency signals having different frequencies, and converts the multi-wave signals In the multi-frequency radar detector comprising a radio frequency (RF) module 200 for converting into an intermediate frequency signal, and a baseband (BB) module 300 for demodulating the intermediate frequency signal to perform signal processing, The RF module 200, A low noise amplifier (210) for amplifying and outputting the multiple propagated signal from the MW module (100); A plurality of first band pass filters (220, 221, 222) for classifying the multiple propagated signals output from the low noise amplifier (210) according to frequency; A plurality of local oscillators (231, 232, 233) for generating local oscillation signals for radio signals passing through respective first band pass filters (220, 221, 222); A plurality of signals for outputting a frequency-converted signal by mixing the radio wave signal passing through each of the first band pass filter 220, 221, 222 and the local oscillation signal generated in each local oscillator (231, 232, 233) Mixers 234, 235 and 236; And The second band pass filter 240 for passing only the signal whose frequency is the frequency of the intermediate frequency signal among the signals from which the frequencies output from the mixers 234, 235, and 236 are converted, is transmitted to the BB module 300. Including; Wherein the plurality of local oscillators (231, 232, 233) and the plurality of mixers (234, 235, 236) are embedded in one integrated circuit (230). The method of claim 1, The RF module 200 may determine a frequency of local oscillation signals of the plurality of local oscillators 231, 232, and 233 based on the frequencies of the modulated frequency signals output from the plurality of mixers 234, 235, and 236. And a frequency synthesizer 237 for generating a control signal for changing the control signal and applying the control signal to the plurality of local oscillators 231, 232, and 233 and embedded in the integrated circuit 230. Frequency radar detector.

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