KR100947215B1 - Rf signal transceiver in radar system and method thereof - Google Patents

Abstract

Provided is a radio frequency signal transmission / reception apparatus of a radar system. An RF signal transmitting / receiving apparatus of a radar system includes a signal source for generating a chirp signal at a predetermined period, and an uplink converting the chirp signal to a different radio frequency subband according to the period. An RF transmitter for generating a signal and an RF receiver for down converting a received RF chirp signal corresponding to the transmitted RF chirp signal. While simplifying the structure of the RF signal transceiver of the radar system, it is possible to extend the bandwidth (bandwidth) of the chirp signal.

Radar, concubine, RF transmitter, RF receiver, bandwidth

Description

RF signal transmission and reception apparatus of radar system and its method {RF SIGNAL TRANSCEIVER IN RADAR SYSTEM AND METHOD THEREOF}

The present invention relates to a radio frequency (RF) signal transmission and reception apparatus and method of the radar system, and more particularly, to an RF signal transmission and reception apparatus and method of the radar system that extends the bandwidth (chirp signal) bandwidth (chirp signal) It is about.

A radar system is a device that emits electromagnetic waves toward a target to detect the shape of the target or the distance from the reflected wave to the target. Radar systems are important for resolution. Resolution is divided into range resolution and azimuth resolution. The distance resolution is the minimum distance difference that can be identified by distinguishing two adjacent targets in the same direction, and the orientation resolution is the minimum orientation that can be identified by distinguishing two adjacent targets in the same distance. The azimuth resolution of a typical radar system is half of the antenna azimuth length, and considering the actual antenna size, the azimuth resolution is higher than the distance resolution. Therefore, increasing the resolution of the radar system has the same meaning as increasing the distance resolution.

The resolution of the radar system is more important for military use than for civilian use. For military radar systems, resolutions of less than 1 m are required to obtain target-level data. Radar systems in the past have resolutions of several tens of meters and bandwidths of tens of MHz. Recent trends in radar systems are high resolution systems with resolutions of less than 1m and require wide bandwidths with bandwidths of 200MHz and above. In order to manufacture such a wideband system, an RF signal transceiver including an RF transmitter for generating and transmitting an RF signal and an RF receiver for receiving an RF signal should be capable of operating at a wide bandwidth.

In general, the RF signal transmitting and receiving device of the radar system uses a chirp signal (chirp signal). A chirped signal is a signal whose frequency increases with period. The radar system's RF signal transceiver needs to increase the bandwidth of the chirped signal to increase its distance resolution. However, in order to transmit or receive a broadband chirp signal, the RF transmitter must be able to produce a broadband chirp signal, and the RF receiver must be able to receive the broadband chirp signal. In addition, the radar system has a problem that a wideband analog to digital converter (ADC) and digital to analog converter (DAC) is required.

Therefore, there is a need for an RF signal transmitting and receiving device of a radar system that can efficiently expand the bandwidth of a chirped signal.

It is an object of the present invention to provide an apparatus and method for transmitting and receiving an RF signal of a radar system that extends a bandwidth of a chirped signal.

In one aspect, an apparatus for transmitting and receiving an RF signal of a radar system is provided. The RF signal transmitting and receiving apparatus of the radar system is a signal source for generating a chirp signal at a predetermined cycle, an RF transmitter for up-converting the chirp signal to another RF subband (subband) according to the cycle to generate a transmission RF chirp signal And an RF receiver configured to down convert a received RF chirp signal corresponding to the transmitted RF chirp signal.

In another aspect, a method of transmitting and receiving an RF signal of a radar system is provided. In the RF signal transmission and reception method of the radar system, in the RF signal transmission and reception apparatus of the radar system, generating a chirp signal at a predetermined period, generating a transmission RF chirp signal by up-converting the chirp signal to another RF subband according to the period Transmitting the transmit RF chirp signal, receiving a received RF chirp signal corresponding to the transmit RF chirp signal, and downconverting the received RF chirp signal.

An apparatus and method for transmitting and receiving an RF signal of a radar system for extending the bandwidth of a chirp signal are provided. Since the chirped signal is upconverted to another RF subband according to a cycle and downconverted again for each signal upconverted to each RF subband, it is not necessary to use a plurality of transmitters and a plurality of receivers for the number of RF subbands. That is, one transmitter and one receiver can be used. Therefore, while simplifying the structure of the RF signal transceiver of the radar system, it is possible to expand the bandwidth of the chirp signal. As bandwidth increases, the radar system's resolution increases, increasing the performance of the radar system as a whole.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like numbers refer to like elements throughout.

1 is a block diagram illustrating an RF signal transmitting and receiving device of a radar system according to an exemplary embodiment of the present invention.

Referring to FIG. 1, an RF signal transmitting and receiving apparatus of a radar system includes a signal source 100 and an RF frequency 300. The RF subsystem 300 includes a radio frequency (RF) transmitter 310 and a radio frequency (RF) receiver 320. In addition, the RF signal transceiver of the radar system includes an IF subsystem (intermediate frequency subsystem, 200), a duplexer (400), an analog to digital converter (ADC), a host processor (host processor, 600), It may include a timing controller 700 and an antenna 900. The IF subsystem 200 may include an intermediate frequency (IF) transmitter 210 and an intermediate frequency (220) receiver 220. The RF signal transmitting and receiving apparatus of the radar system may omit the IF subsystem 200.

The signal source 100 generates a chirp signal, which is a baseband signal, at regular intervals. The transmission patch signal is a signal whose frequency increases with period. For example, the transmission chirp signal may be a baseband signal having a bandwidth of BW _Base from frequencies f _{Base , 1} to f _{Base , 2} .

The IF transmitter 210 may up convert the transmission chirp signal generated by the signal source 100 to an intermediate frequency (IF) band to generate a transmission IF chirp signal. The IF transmitter 210 may up-convert the transmission chirp signal to the IF band by loading an IF carrier frequency (IF carrier frequency, intermediate frequency) f _{IF , C.} For example, the transmit IF chirped signal may be an IF chirped signal having a bandwidth of BW _IF from frequency f _{IF , 1} to f _{IF , 2} . In this case, the BW _IF is equal to the bandwidth BW _Base of the baseband signal before upconversion.

The RF transmitter 310 up-converts the transmission IF chirp signal generated by the IF transmitter 210 to another RF band according to a period, and generates different transmission RF chirp signals. If the IF subsystem 200 is omitted, it directly converts the transmit chirp signal generated at the signal source 100 into a transmit RF chirp signal.

Each other RF band is called an RF subband. The RF subbands are adjacent to each other so that the sum of the RF subbands results in an RF broadband with an extended bandwidth.

If the bandwidth extension ratio N is 3, the RF transmitter 310 loads RF _{RF , C1} , f _{RF , C2} or f _{RF , C3} , which are different RF carrier frequencies according to a transmission IF congestion signal. Can be upconverted to band.

For example, the first transmit RF chirp signal may be a first RF subband SB1 signal from frequencies f _{RF , 1} to f _{RF , 2} , upconverted by the RF carrier frequencies f _{RF , C1} . The second transmit RF chirp signal may be a second RF subband (SB2) signal from frequency f _{RF , 2} to f _{RF, 3} , upconverted by the RF carrier frequency f _{RF , C2} . The third transmit RF chirp signal may also be a third RF subband SB3 signal from frequencies f _{RF , 3} to f _{RF , 4} , upconverted by the RF carrier frequencies f _{RF , C3} . In this case, the RF wide bandwidth BW _RF that combines each of the RF subbands SB1, SB2, and SB3 is a frequency f _{RF , 1} to f _{RF , 4} . Since the bandwidth of one RF subband is equal to the bandwidth BW _Base of the baseband, the BW _RF has a bandwidth of 3 x BW _Base . As such, when the other RF subbands are adjacent to each other and the maximum frequency of the low frequency band of the RF subband matches the minimum frequency of the adjacent RF subband immediately, bandwidth extension can be maximized. If the bandwidth extension ratio is N, the bandwidth can be extended up to N x BW _Base .

Since the chirp signal is upconverted to another RF subband according to a period, it is not necessary to use a plurality of RF transmitters as many as the number of RF subbands. If up-converting a chirp signal to another RF subband at the same time, it is necessary to use as many RF transmitters as the number of RF subbands. In the case of the present invention, since one RF transmitter needs to be used, the structure of the RF signal transceiver of the radar system can be simplified.

The duplexer 400 is used to jointly use one antenna 900 for transmission and reception. The duplexer 400 protects the RF receiver 320 from a transmitted RF chirp signal when transmitting, and receives the received RF chirp signal when receiving the RF receiver. Supply to 320.

Antenna 900 transmits a transmit RF chirp signal. The transmitted RF chirp signal is reflected at the target, mixed with noise and received back to the antenna 900. The signal received by the antenna 900 is called a received RF chirp signal.

The RF receiver 320 down converts the received RF chirp signal to an intermediate frequency band to generate a received IF chirp signal. If the IF subsystem 200 is omitted, the RF receiver 320 directly converts the received RF chirp signal to baseband to generate a received chirp signal.

The RF receiver 320 converts the received RF chirp signal into the IF band by using different RF carrier frequencies f _{RF , C1} , f _{RF , C2,} or f _{RF , C3} according to RF subbands corresponding to the received RF chirp signal. Can be downconverted.

For example, the first received RF chirp signal corresponding to the first RF subband SB1 is a received IF having a bandwidth BW _IF from frequencies f _{IF , 1} to f _{IF , 2} using the RF carrier frequencies f _{RF and C1} . It can be down-converted into a chirp signal. The second received RF chirp signal corresponding to the second RF subband SB2 is downward to the received IF chirp signal having a bandwidth BW _IF from frequencies f _{IF , 1} to f _{IF , 2} using the RF carrier frequencies f _{RF and C2} . Can be converted. Also, the third received RF chirp signal corresponding to the third RF subband SB3 is a received IF chirp signal having a bandwidth BW _IF from frequencies f _{IF , 1} to f _{IF, 2} using the RF carrier frequencies f _{RF and C3} . Can be downconverted.

Since the received RF chirp signal corresponding to another RF subband is down-converted according to a period, it is not necessary to use a plurality of RF receivers as many as the number of RF subbands. If down-converting the chirp signals corresponding to different RF subbands simultaneously to the IF band, a plurality of RF receivers should be used as many as the number of RF subbands. In the case of the present invention, since one RF receiver needs to be used, the structure of the RF signal transceiver of the radar system can be simplified.

The IF receiver 220 down-converts the received IF chirp signal to baseband to generate a received chirp signal. The IF receiver 220 may down-convert the received IF chirped signal to baseband by using the IF carrier frequencies f _{IF and C.} For example, the reception chirp signal may be a baseband signal having a bandwidth of BW _Base from frequencies f _{Base, 1} to f _{Base , 2} .

The analog-to-digital converter 500 converts a reception chirp signal that is an analog signal into a digital chirp signal that is a digital signal.

The host processor 600 processes the digital chirp signal to find out the existence of the target, the distance to the target, and the like. The host processor 600 provides the timing controller 700 with information about timing. In addition, the host processor 600 may be connected to the signal source 100 to control the signal source 100 or receive information on a transmission chirp signal generated by the signal source 100.

The timing controller 700 generates a timing control signal. The generated timing control signal is transmitted to the signal source 100, the RF subsystem 300, and the analog-to-digital converter 500 to control the timing of the generation signal, up-conversion, and down-conversion of the chirp signal. The timing controller 700 may generate a timing control signal using a device such as a field-programmable gate array (FPGA).

2 is a block diagram illustrating an RF transmitter.

Referring to FIG. 2, the RF transmitter 310 includes a plurality of transmitter local oscillators 311, a local oscillator switch 312, a transmitter mixer 313, a filter switch 314, A plurality of transmitter band pass filter (BPF, band pass filter, 315) is included. In addition, the RF transmitter 310 may include a power combiner 316, an amplifier 317, or the like. The LO switch and filter switch may be implemented as one transmitter switch. 2 illustrates a case in which the bandwidth extension ratio is N, where N transmitter local oscillators 311-1, 311-2, ..., 311-N and N transmitter bandpass filters 315-1, 315 are shown. -2, ..., 315-N). The RF transmitter uses a plurality of transmitter local oscillators, mixers, a plurality of transmitter bandpass filters, and a transmitter switch, thereby eliminating the need to use as many RF transmitters as the number of RF subbands. Since only one RF transmitter is used, the structure of the RF signal transceiver of the radar system can be simplified.

Each of the plurality of transmitter local oscillators 311 generates specific oscillation frequency signals corresponding to different RF subbands. The first local oscillator 311-1, the second local oscillator 311-2,..., The N-th local oscillator 311-N each include a first RF subband, a second RF subband, ... Generate an oscillation frequency signal corresponding to the N-th RF subband. For example, the second local oscillator 311-2 may generate an oscillation frequency corresponding to the RF carrier frequency f _{RF, C2} to generate a second transmit RF chirp signal that is a second RF subband SB2 signal. Can be.

The LO switch 312 receives the timing control signal from the timing controller 700, selects one local oscillator from the plurality of transmitter local oscillators 311, and connects the timing control signal to the transmitter mixer 313. . For example, when N is 3, the LO switch 312 may use a single pole triple throw (SP3T) switch.

The transmitter mixer 313 synthesizes the transmission IF chirp signal generated by the IF transmitter 210 and the oscillation frequency signal generated by the transmitter local oscillator 311 and upconverts the transmission IF chirp signal to an RF subband.

The filter switch 314 receives the timing control signal from the timing controller 700, selects one bandpass filter among the plurality of bandpass filters 315, and connects the timing control signal to the mixer 313. . The filter switch 314 uses the same timing control signal as the LO switch 312. Accordingly, the filter switch 314 selects a bandpass filter having a center frequency corresponding to the oscillation frequency of the local oscillator selected by the LO switch 312. For example, when the LO switch 312 connects the mixer 313 and the second local oscillator 311-2, the filter switch 314 connects the mixer 313 and the second bandpass filter 315-2. Connect. For example, when N is 3, the filter switch 314 may use a single pole triple throw (SP3T) switch.

The transmitter bandpass filter 315 filters the RF chirped signal and removes unnecessary frequency output components. The passband of each transmitter bandpass filter 315 is designed to match each RF subband. For example, the passband of the second bandpass filter 315-2 will match the second RF subband.

The power synthesizer 316 adds the RF chirp signals passed through each transmitter bandpass filter 315-1, 315-2, ..., 315-N.

The amplifier 317 amplifies and converts the RF chirp signal passed through the power synthesizer 316 into a transmit RF chirp signal. The transmit RF chirp signal is transmitted via the antenna 900.

3 is a block diagram illustrating an RF receiver.

Referring to FIG. 3, the RF receiver 320 includes a filter switch 322, a plurality of receiver band pass filters (BPFs) 323, a plurality of receiver local oscillators (LOs 325), a LO switch 326, and a receiver mixer ( 327). The LO switch and filter switch can also be implemented as a single receiver switch. In addition, the RF receiver 320 may include a low noise amplifier (LNA) 321, a power synthesizer 324, and the like. 3 illustrates a case in which the bandwidth extension ratio is N, where N receiver bandpass filters 323-1, 323-2, ..., 323-N and N receiver local oscillators 325-1, 325 are shown. -2, ..., 325-N). The RF receiver uses a plurality of receiver local oscillators, a receiver mixer, a plurality of receiver bandpass filters, and a receiver switch, thereby eliminating the need for multiple RF receivers as many as the number of RF subbands. Since only one RF receiver is used, the structure of the RF signal transceiver of the radar system can be simplified.

The low noise amplifier 321 amplifies the signal and outputs the received RF chirped signal while suppressing amplification of the noise of the received signal reflected by the target to the RF signal transceiver of the radar system.

The filter switch 322 receives the timing control signal from the timing controller 700 and uses the timing control signal to match the RF subbands corresponding to the received RF chirp signals among the plurality of receiver bandpass filters 323. Select bandpass filter. For example, when N is 3, the filter switch 322 may use a single pole triple throw (SP3T) switch.

The receiver bandpass filter 323 filters out the received RF chirped signal to remove unnecessary frequency output components. The passband of each receiver bandpass filter 323 is designed to match each RF subband. For example, the passband of the second bandpass filter 323-2 will match the second RF subband.

The power synthesizer 324 adds the received RF chirp signals that pass through each bandpass filter 323.

The receiver local oscillator 325 generates a specific oscillation frequency signal. The first local oscillator 311-1, the second local oscillator 311-2,..., The N-th local oscillator 311 -N generate different oscillation frequency signals. Each local oscillator 325 generates an oscillation frequency corresponding to each RF subband. For example, the second local oscillator 311-2 may oscillate a frequency corresponding to the RF carrier frequencies f _{RF and C2} to downconvert the second received RF chirp signal, which is a second RF subband SB2 signal. Can be generated.

The LO switch 326 receives the timing control signal from the timing controller 700, selects one local oscillator from the plurality of receiver local oscillators 326, and connects the timing control signal to the receiver mixer 327. . For example, when N is 3, the LO switch 326 may use a single pole triple throw (SP3T) switch. The LO switch 326 uses the same timing control signal as the filter switch 322. Accordingly, the LO switch 326 selects a receiver local oscillator having an oscillation frequency corresponding to the pass band of the receiver bandpass filter selected by the filter switch 322. For example, when the filter switch 322 selects the second bandpass filter 315-2, the LO switch 326 connects the mixer 327 and the second local oscillator 325-2. For example, when N is 3, the LO switch 326 may use a single pole triple throw (SP3T) switch.

The receiver mixer 327 synthesizes the received RF chirp signal passing through the power synthesizer 324 and the oscillation frequency signal generated by the receiver local oscillator 325, and down converts the received RF chirp signal into an IF chirp signal. The down-converted received IF chirped signal is input to the IF receiver 220.

4 is for explaining the conversion of the signal in the frequency domain. (A) indicates baseband, (b) indicates IF band, and (c) indicates RF band.

Referring to FIG. 4, the x axis represents frequency f and the y axis represents power. 4 illustrates the case where the bandwidth extension ratio N is three.

The baseband signal shown in (a) may be a transmission chirp signal generated by the signal source 100 (see FIG. 1). In addition, the baseband signal may be a reception chirp signal in which the IF receiver 220 (refer to FIG. 1) down-converts the received IF chirp signal.

The IF chirp signal shown in (b) may be a transmission IF chirp signal in which the IF transmitter 210 (see FIG. 1) up-converts the transmit chirp signal to the IF band. In addition, the IF chirp signal is down-converted using different RF carrier frequencies (f _{RF , C1} , f _{RF , C2} or f _{RF , C3} ) as the RF receiver 320 (see FIG. 1) gives each received RF chirp signal. It can be one receive IF chirp signal.

Each RF subband (SB1, SB2, SB3) signal shown in (c) has different RF carrier frequencies (f _{RF , C1} , f _RF ) as the RF transmitter 310 (see FIG. 1) gives a transmit IF chirp signal. _{, C2,} or f _{RF , C3} ). In addition, each of the RF subbands SB1, SB2, and SB3 may be a received RF chirp signal received through an antenna 900 (see FIG. 1). As shown in (c), it can be seen that each of the RF subbands SB1, SB2, and SB3 are combined to expand the bandwidth, thereby extending the RF wide bandwidth BW _RF to 3 x BW _Base .

5 is for explaining the conversion of the signal in the frequency domain and time domain. Referring to FIG. 5, the x axis represents time t and the y axis represents frequency f. 5 shows the case where the bandwidth extension ratio N is three.

During the first pulse period (0 to T _p ), a transmission chirp signal is generated, which is a baseband signal having a signal width of the signal source 100 (see FIG. 1) τ _p , and the IF transmitter 210 (see FIG. 1) generates a transmission chirp. Up-convert the signal to a transmit IF chirped signal. The RF transmitter 310 (refer to FIG. 1) upconverts the transmit IF chirp signal into a first transmit RF chirp signal corresponding to the first subband SB1. The first transmit RF chirp signal is transmitted through the antenna 900 (see FIG. 1), and is again received as a first received RF chirp signal corresponding to the first subband SB1 through the antenna 900.

The RF receiver 320 (see FIG. 1) down-converts the first received RF band signal to a received IF chirped signal. The IF receiver 220 (see FIG. 1) down-converts the received IF chirped signal to a received chirped signal which is a baseband signal. When the down conversion is complete, the cycle ends and another cycle begins.

After the end of the first pulse period, a second pulse period (T _p ~ _p 2T) while the signal source 100 generates a transmission signal adhesive preparation and a pulse width of the baseband signal is τ _p. This means that after the transmission and reception of one cycle chirp signal is completely completed, the next cycle chirp signal is transmitted. The IF transmitter 210 upconverts the transmission chirp signal into a transmission IF chirp signal. The RF transmitter 310 up-converts the transmit IF chirp signal into a second transmit RF chirp signal corresponding to the second subband SB2. The second transmit RF chirp signal is transmitted through the antenna 900 and is again received as a second received RF chirp signal corresponding to the second subband SB2 via the antenna 900.

The RF receiver 320 down-converts the second received RF band signal to a received IF chirped signal. The IF receiver 220 converts the received IF chirp signal down into a received chirp signal which is a baseband signal.

After the second pulse period is over, during the third pulse price 2T _p to 3T _p , the signal source 100 generates a transmission chirp signal that is a baseband signal having a pulse width of τ _p . The IF transmitter 210 upconverts the transmission chirp signal into a transmission IF chirp signal. The RF transmitter 310 upconverts the transmit IF chirp signal into a third transmit RF chirp signal corresponding to the third subband SB3. The third transmit RF chirp signal is transmitted through the antenna 900, and is again received as a third received RF chirp signal corresponding to the third subband SB2 through the antenna 900.

The RF receiver 320 down-converts the third received RF band signal to a received IF chirped signal. The IF receiver 220 down-converts the received IF chirped signal into a received chirped signal that is a baseband signal.

Each RF subband (SB1, SB2, SB3) is combined to expand the bandwidth, it can be seen that the RF wide bandwidth BW _RF has been extended to 3 x BW _Base .

6 is an RF signal transmission and reception method of a radar system according to another embodiment of the present invention.

Referring to FIG. 6, the signal source 100 (see FIG. 1) of the RF signal transmitting / receiving apparatus of the radar system generates a chirp signal at a predetermined cycle (S10). The RF transmitter 310 (refer to FIG. 1) generates a transmitted RF chirp signal by up-converting the chirp signal to another RF subband according to a period (S20). The RF signal transmitting and receiving apparatus of the radar system transmits a transmitting RF chirp signal (S30), and receives a received RF chirp signal corresponding to the transmitting RF chirp signal (S40). The RF receiver 320 (see FIG. 1) down-converts the received RF chirp signal (S50).

All of the above functions may be performed by a processor such as a microprocessor, a controller, a microcontroller, an application specific integrated circuit (ASIC), or the like according to software or program code coded to perform the function. The design, development and implementation of the code will be apparent to those skilled in the art based on the description of the present invention.

Although the present invention has been described above with reference to the embodiments, it will be apparent to those skilled in the art that the present invention may be modified and changed in various ways without departing from the spirit and scope of the present invention. I can understand. Therefore, the present invention is not limited to the above-described embodiment, and the present invention will include all embodiments within the scope of the following claims.

1 is a block diagram illustrating an RF signal transmitting and receiving device of a radar system according to an exemplary embodiment of the present invention.

2 is a block diagram illustrating an RF transmitter.

3 is a block diagram illustrating an RF receiver.

4 is for explaining the conversion of the signal in the frequency domain.

5 is for explaining the conversion of the signal in the frequency domain and time domain.

6 is a flowchart illustrating a method for transmitting / receiving an RF signal of a radar system according to another exemplary embodiment of the present invention.

** Explanation of symbols in main part of drawing **

100: signal source

310: RF transmitter

320: RF receiver

Claims (8)

A signal source for generating a chirp signal at regular intervals; An RF transmitter configured to upconvert the chirp signal to another radio frequency (RF) subband according to the period to generate a transmit RF chirp signal; And An RF receiver configured to down convert a received RF chirp signal corresponding to the transmitted RF chirp signal; The RF transmitter A plurality of transmitter band pass filters (BPFs) respectively filtering the other RF subbands; A plurality of transmitter local oscillators for generating respective oscillation frequency signals corresponding to the other RF subbands; A transmitter switch for selecting one transmitter bandpass filter among the plurality of transmitter bandpass filters and selecting one transmitter local oscillator among the plurality of transmitter local oscillators according to the period; And And a transmitter mixer for combining the oscillation frequency signal generated by the selected transmitter local oscillator and the chirp signal and inputting the up-converted signal to the selected transmitter bandpass filter. delete The method of claim 1, The RF receiver A plurality of receiver bandpass filters respectively filtering the other RF subbands; A plurality of receiver local oscillators for generating respective oscillation frequency signals corresponding to the other RF subbands; A receiver switch for selecting one receiver bandpass filter among the plurality of receiver bandpass filters and selecting one receiver local oscillator among the plurality of receiver local oscillators according to the period; And And a receiver mixer configured to down-convert the received RF chirp signal passing through the selected receiver bandpass filter with the oscillation frequency signal generated by the selected receiver local oscillator. The RF signal transmission and reception of the radar system according to claim 1, wherein the other RF subbands are adjacent to each other, and the maximum frequency of the RF subband having a low frequency band is the same as the minimum frequency of the next adjacent RF subband. Device. The RF transmitter of claim 1, wherein the RF transmitter is further configured to upconvert a chirp signal of a next period to another RF subband after the RF receiver finishes downconverting the received RF chirp signal corresponding to the chirp signal of one period. RF signal transceiver for radar system. The apparatus of claim 1, further comprising a timing controller configured to generate a timing control signal for controlling the signal source, the RF transmitter, and the RF receiver. Generating a chirp signal at regular intervals; Generating, according to the period, a transmission oscillation frequency signal corresponding to one RF subband of the plurality of RF subbands; Synthesizing the transmission oscillation frequency signal and the chirp signal to generate an up-converted signal; Filtering the up-converted signal into the one RF subband to generate a transmitted RF chirp signal; Transmitting the transmit RF chirp signal; Receiving a received RF chirp signal corresponding to the transmitted RF chirp signal; And RF signal transmission and reception method of the radar system comprising the step of down-converting the received RF chirp signal. 8. The method of claim 7, wherein downconverting the received RF chirp signal comprises: Filtering the received RF chirp signal into the one RF subband; Generating a received oscillation frequency signal corresponding to the one RF subband; And And combining the filtered received RF chirp signal with the received oscillation frequency signal and down converting the received RF chirp signal.

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