KR20150051679A - Vechicle radar for discriminating false target using variable wave and method for discriminating false target using it - Google Patents

Abstract

Disclosed are a vehicle radar for determining a false target using variable waveforms and a method for determining a false target using the same. The present invention comprises: a transmission part for receiving approval for a chirp signal and generating and radiating a transmission signal having a frequency corresponding to the chirp signal; a reception part for receiving a reception signal generated by reflecting the transmission signal on a target and generating a beat signal using the transmission signal transmitted from the transmission part and the reception signal; and a signal processing part for generating chirp signals having different waveforms for each cycle according to a pre-stored chirp profile to transmit the same to the transmission part, obtaining target information on the target by receiving and analyzing the beat signal, discriminating between a real target and a false target by analyzing whether or not the obtained target information is continuous across a plurality of cycles, and detecting target information on the real target as the final target.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a radar for a vehicle which discriminates a false target using a variable waveform, and a false target discrimination method using the same. [0002] VACCLE RADAR FOR DISCRIMINATING FALSE TARGET USING VARIABLE WAVE AND METHOD FOR DISCRIMINATING FALSE TARGET USING IT [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radar for a vehicle, and more particularly to a radar for a vehicle discriminating a false target using a variable waveform and a false target discrimination method using the radar.

A radar apparatus for outputting an RF signal and receiving the reflected signal reflected from the target to detect the position and velocity of the target has been used mainly for military purposes. However, recently, various functions not previously provided to vehicles have been added to the vehicle, so that the radar device is gradually installed in the vehicle. The radar installed in the vehicle is mainly used to provide safety accident prevention functions such as prevention of collision, detection of blind spot, and cruise control.

For automotive radar, frequency modulated continuous wave (FMCW) radar is generally used. The FMCW radar generates a FMCW signal whose amplitude is constant and whose frequency is linearly variable, and transmits a frequency-modulated signal by combining a modulation frequency signal whose amplitude is adjusted with the generated FMCW signal. The reflected signal of the transmitted signal is received, and the distance and speed of the target object are calculated by combining the bit frequencies of the dwell.

The conventional FMCW radar transmits an FMCW signal, which is a continuous waveform obtained by linearly varying the frequency of the chirp signal generated according to a predetermined chirp profile. That is, the FMCW signal having a variable frequency is transmitted, which is a change within one cycle, and the same type of FMCW signal is generated every period.

However, if the same FMCW signal is transmitted as a transmission signal every period and the distance and velocity of the target are calculated by receiving the reflected signal, a false target having a small distance and speed variation per period can be detected, The false target may be determined as the final target. When a false target is determined as a final target, a radar that detects a virtual object that does not actually exist can provide the user with information about a virtual object. This can cause a warning based on erroneous information to the driver who is driving the vehicle by using the radar, which makes it possible for the driver to make a wrong decision when driving the vehicle, which can be a serious obstacle to safe driving, Resulting in a significant reduction in reliability.

On the other hand, in the radar, the detection distance of the target and the sensing angle are inversely proportional to each other. That is, increasing the sensing distance in the same radar decreases the sensing angle, and if the sensing distance is reduced, the sensing angle can be increased at the same resolution. Korean Patent Laid-Open No. 10-1998-067828 (published on Oct. 15, 1998, Hyundai Electronics Industries) uses this characteristic to set a plurality of modes according to a distance that a radar detects to detect a target with various sensing distances and sensing angles And the FMCW signal having different slopes is transmitted for each mode, thereby varying the target detection capability according to the mode.

Korean Unexamined Patent Publication No. 10-2012-0106567 (published on Sep. 26, 2012, Korea Electronics and Telecommunications Research Institute) has developed the above-described conventional technique and simultaneously developed a plurality of different FMCW Signal at the same time. That is, two FMCW signals corresponding to the near-field mode and the far-field mode, and outputs the transmission signals corresponding to the two FMCW signals to receive the reflected signals.

However, since the FMCW signals for each mode are determined in all the above-described techniques, the chirp for each mode is the same. As the chirp is designed around the detection distance of the target, there is a limitation that the countermeasure against the false target is not considered.

It is an object of the present invention to provide a radar for a vehicle which can generate a FMCW signal having a chirp that varies from cycle to cycle and output a transmission signal to determine a false target.

Another object of the present invention is to provide a false target discrimination method for a radar for a vehicle.

According to an aspect of the present invention, there is provided a vehicular radar comprising: a transmitter receiving a chirp signal and generating and emitting a transmission signal having a frequency corresponding to the chirp signal; A receiving unit for receiving the transmission signal reflected from the target and generating a bit signal using the transmission signal transmitted from the transmission unit and the reception signal; And generating chirp signals of different waveforms for each cycle according to a pre-stored chirp profile and transmitting the generated chirp signals to the transmitter, acquiring target information for the target by receiving and analyzing the bit signals, A signal processing unit for classifying the actual target and the false target by analyzing whether the target is continuous for a predetermined number of cycles and detecting the target information for the actual target as a final target; .

Wherein the signal processor comprises: a chirp signal generator for storing the chirp profile for designating the chirp signals of different waveforms for each period and generating a chirp signal according to each period; A received signal processing unit for receiving the bit signal and signal processing in a predetermined manner to obtain the target information including the speed and distance information of the target; And determines the difference between the target information and the target information according to the cycle to determine whether the difference of the target information is equal to or less than a preset reference value, sets the target information that is equal to or less than the reference value as target information for the real target, A tracking processing unit for setting target information for the false target; And a control unit.

And the tracking processing unit detects the target information as the final target when the target information whose difference of the target information is less than or equal to the reference value is repeated more than a predetermined count value in successive periods.

Wherein the transmitter comprises: a frequency generator for generating an FMCW signal having a different frequency for each period in response to the chirp signal as the transmission signal; A frequency divider for dividing the transmission signal and transmitting it as a local signal to the receiver; And a transmission antenna for radiating the transmission signal to the outside; And a control unit.

Wherein the receiver comprises: a plurality of receive antennas each receiving the receive signal; A plurality of mixers for generating a bit signal having a bit frequency by down-converting the received signal using a frequency difference between the plurality of reception signals received by the plurality of reception antennas and the local signal; An AD converter for converting the bit signal into a digital signal and transmitting the digital signal to the signal processor; And a control unit.

According to another aspect of the present invention, there is provided a false target determining method for a radar for a vehicle, the false target identifying method for a radar for a vehicle including a transmitter, a receiver and a signal processing unit, Generating the chirp signals of different waveforms for each period and transmitting the chirp signals to the transmitter; Generating a transmission signal having a frequency corresponding to the chirp signal by receiving the chirp signal transmitted from the signal processing unit; Generating a bit signal using the transmission signal and the reception signal transmitted from the transmission unit, the reception unit receiving the reception signal in which the transmission signal is reflected to the target; The signal processing unit receiving and analyzing the bit signal to obtain target information for the target; And analyzing whether the acquired target information is continuous for a plurality of times of cycles to distinguish the actual target and the false target, and detecting the target information for the actual target as a final target; .

Wherein the detecting with the final target comprises receiving the bit signal and signal processing in a predetermined manner to obtain the target information including the speed and distance information of the target; Determines whether the difference of the target information is equal to or less than a preset reference value in a continuous cycle, sets the target information that is equal to or less than the reference value as target information for the real target, and sets the remaining target information as target information for the false target step; Setting target information for the real target as final target information; And a control unit.

Wherein the setting of the final target information is performed by detecting the target information as the final target when the target information whose difference of the target information is less than or equal to the reference value is repeated more than a predetermined count value in successive periods.

Therefore, a vehicle radar for discriminating a false target using the variable waveform of the present invention and a false target discrimination method using the same generates FMCW signals of different chirps every period, outputs a transmission signal corresponding to the FMCW signal, By analyzing, it is possible to determine a false target having a large distance and velocity variation according to each cycle. Therefore, detection of a false target as a final target can reduce the risk of safety accidents and increase reliability.

1 shows a configuration of a radar for a vehicle according to an embodiment of the present invention.
2 shows a time-frequency relationship of a reception signal with respect to a transmission signal.
3 shows an example of a frequency spectrum in each chirp.
4 shows an example of a chirp signal according to the present invention.
5 shows a false target determination method of a radar for a vehicle according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members.

Throughout the specification, when an element is referred to as "including" an element, it does not exclude other elements unless specifically stated to the contrary. The terms "part", "unit", "module", "block", and the like described in the specification mean units for processing at least one function or operation, And a combination of software.

FIG. 1 shows a configuration of a radar for a vehicle according to an embodiment of the present invention, and includes a transmission unit 100, a reception unit 200, and a signal processing unit 300.

The transmission unit 100 includes a frequency generator 110 for receiving a chirp signal from the signal processing unit 300 and generating a transmission signal corresponding to the chirp signal, a frequency divider 110 for distributing the transmission signal and transmitting it as a local signal to the reception unit 200, And a transmission antenna Tx for radiating a transmission signal to the outside.

The receiving unit 200 includes a plurality of receiving antennas Rx for receiving the reflection signals reflected from the target as reception signals, a receiving unit for receiving signals transmitted through corresponding receiving antennas of the plurality of receiving antennas Rx, 100 generating a beat signal having a beat frequency f _b by down-converting the received signal using the frequency difference between the local signal transmitted from the frequency divider 120 and the received signal, A plurality of filters FL for removing noise from the bit signals generated by the mixer MIXER and a plurality of filters FL for converting the noise canceled bit signals into digital signals, And a plurality of AD converters (ADCs) for transmitting the signals to the signal processing unit 300.

The signal processor 300 generates a chirp signal according to a predetermined chirp profile and transmits the chirp signal to the transmitter 100. The chirp generator 310 receives a plurality of digital signals transmitted from the receiver 200, A receiving signal processing unit 320 for calculating a horizontal axis position, a vertical axis position and a velocity of the target as target information, and a receiving signal processing unit 320 for receiving and analyzing the information of the detected target, And a tracking processing unit 330 for performing tracking processing.

In the present invention, a chirp signal is generated according to the chirp profile to emit a transmission signal, and the reflection signal is received as a reception signal, and the operation until the tracking processing unit 330 detects the final target is determined to be one cycle do. In the present invention, as shown in Table 1, the chirp generation unit 310 sets and stores a chirp profile so that the chirp signal changes in every cycle.

The reception signal processing unit 320 applies Windowing, Fast Fourier Transform (FFT), Digital Beam Forming (DBF), Constant False Alarm Ratio (CFAR), and distance-speed calculation processes to the digital signal transmitted from the receiver 100 And calculates the horizontal axis position, vertical axis position and velocity of the target as target information. The above-described Windowing, Fast Fourier Transform (FFT), Digital Beam Forming (DBF), Constant False Alarm Ratio (CFAR), and distance-speed calculation processes are well-known techniques and will not be described in detail here.

The tracking processing unit 330 manages target information through target information filtering, target generation, previous target information, proximity confirmation of current target information, target maintenance, target deletion, and final target detection process.

In the signal processing unit 300 of the present invention, the chirp generation unit 310 generates different chirp signals for every cycle and transmits the generated chirp signals to the transmission unit 100, And output. The received signal processing unit 320 of the signal processing unit 300 receives the reflected signal, that is, the received signal, of the transmission signal whose frequency is variable, and acquires target information. The target information obtained at this time may include false target information as in the conventional technique described above. However, in the present invention, the tracking processor 330 can easily distinguish between an actual target and a false target based on target information measured for a plurality of periods, thereby erasing the target information for the false target. This is because the radar for the vehicle of the present invention varies the frequency of the transmission signal every week, unlike the conventional radar. In the case of radiating the same frequency of the transmission signal for each cycle as in the conventional radar, the target information for the false target is similarly generated even if it is detected repeatedly in a plurality of cycles. When the target information for the false target is repeatedly detected in a plurality of cycles and similarly, the radar does not have a means for distinguishing it as a false target, so it recognizes the target as the actual target, holds the target information, and discriminates it as the final target. However, if the frequency of the transmission signal varies according to the period, the target information about the actual target can be stably obtained even if the frequency of the transmission signal varies with each cycle. For example, even if the frequency of the transmission signal changes, the distance of the target in the target information obtained in the previous period can be maintained at a distance within 100 m from the distance of the target obtained in the current period. This is because even if the frequency of the transmission signal changes during one period, the actual distance of the target can not be physically large. However, the target information for the false target varies greatly in each cycle. False targets are not actually present targets, but are most often detected by the noise generated by the surrounding environment, and the characteristics of the transmitted and received signals. Therefore, when the frequency of the transmission signal is changed, the target information obtained for each cycle is generated as a very large difference even if the previously acquired target information disappears or is acquired in the next target information. Therefore, the tracking processing unit 330 can first determine false target information by determining whether the target information is detected a plurality of times. Even if a plurality of times are detected, if the difference of the target information per cycle is very large, it can be determined that the target information is the target information for the false target. For example, if the distance from the target information acquired in the previous period to the target is greater than 1 Km from the target information acquired in the current cycle to the target, it can be determined that the radar is a false target.

For this, the tracking processor 330 may set a reference value for determining whether the difference of the target information by period is large or not, and the reference value varies depending on the period. That is, if the period is long, the reference value can be increased or, if the period is short, the reference value can be reduced. The period is the time to detect the target, the target is detected more frequently if the period is short (for example, 1 ms), while the frequency of detecting the target is low if the period is long (for example, 100 ms). In the above description, the reference value is specified as a specific value, but the reference value may be set in the range. The tracking processing unit 330 can determine the false target in the above-described manner, and for the sake of accuracy, count the number of times of detection of the target. That is, the number of times that the target information with a small difference is detected is counted cumulatively, and the false target can be analyzed by discriminating the actual target only when the count value is equal to or greater than a preset reference count value (for example, 4).

2 shows a time-frequency relationship of a reception signal with respect to a transmission signal.

In Figure 2 (a) shows a frequency relationship between the transmission signal and the reception signal, (b) represents a bit that is the frequency (f _b) a frequency difference between the transmitting signal and the reception signal.

(a) shows an up-chirp in which the frequency linearly increases as the time of the transmission signal increases and a down-chirp in which the frequency linearly decreases as the transmission signal increases in time .

(b) the bit frequency (f _b) an up chirp bit frequency (f _bu) and the up-chirp beat frequency can be divided by (f _bd), up chirp bit frequency (f _bu) in accordance with the up chirp and down chirp as shown in And the upchip bit frequency (f _bd ) are expressed by Equations (1) and (2).

(Where BW is the bandwidth, T _m is a dwell (dwell) time, t _d is the delay time, f _d is the Doppler frequency, f _bu an up chirp beat frequency, f _bd is up chirp beat frequency, r is the distance, v of the target And c is the speed of light.

The relative velocity v has a positive value when moving in a direction away from the radar, and a negative value when moving in a direction approaching the target.

The signal processing unit 300 acquires target information using the upchip bit frequency f _bu and the upchip bit frequency f _bd when calculating the distance and the relative speed to the target at the time of acquiring the target information.

The signal processing unit 300 derives Equations 3 and 4 from Equations 1 and 2 to obtain the distance r and the relative velocity v to the target to be included in the target information.

Then, equations (3) and (4) are used to obtain the distance to the target and the velocity of the target as target information.

3 shows an example of a frequency spectrum in each chirp.

In Fig. 3, the solid line indicates the frequency spectrum of the radar signal, and the dotted line indicates the CFAR threshold value. And it is detected that the black solid line exceeds the CFAR threshold value. In Fig. 3, it is assumed that there are two targets as bit signals obtained for two chirp signals. Where the two chirps are the upchip and the down chirp.

If the frequency detected at the k-th chirp in the j-th chirp is denoted by F (k, j), the respective frequencies can be expressed as follows. The bit frequencies of the signals detected in the first chirp are F (1, 1) and F (2, 1), and the bit frequencies of the signals detected in the second chirp are F (1, 2) and F (2, 2).

(R2, V2), (R3, V3), (R4, V4) are calculated as shown in Table 2 by calculating the distance-speed through the combination of frequencies from each chirp. )). ≪ / RTI >

Since two signals are detected at each chirp, but the calculated distance-velocity is four, it can be seen that there are two false targets. If F (1, 1) and F (1, 2) are detected on the same target and F (2, 1) and F F (1, 1) and F (2, 2) calculated in (R1, V1) and (R2, V2) calculated in F (2, 1) and F (2, 1) and F (1, 2) are false target information.

In this case, the tracking processor 330 does not use the target information transmitted from the received signal processing unit 320 as a final target, but uses the target information only when a target is detected for a set number of times over a plurality of periods. In addition, a predetermined reference range (information error range) is set to analyze the similarity with the target information (horizontal axis distance, vertical axis distance, speed) detected in other periods, and it is determined that the target is the same only when there is a difference within the reference range, Increase the count value for the target. However, when it is determined that the target is over the reference range, it is determined that the target is different and the count value for the target is not increased.

The tracking processor 330 determines that the target is the actual target only when the count value is equal to or greater than the preset reference count value, and sets the final target. However, when the count value is equal to or less than the predetermined reference count value, it is determined that the false target is not set as the final target.

4 shows an example of a chirp signal according to the present invention.

Three or more chirp signals can be used to reduce the influence of the false target. However, as the number of chirp signals increases, the time of one cycle increases, so a method of reducing a false target in a limited chirp is required. In order to solve the above problem, as shown in Table 1, different chirp profiles are provided for each period. In this case, the chirp signal as shown in Fig. 4 is generated.

A description will now be made of a method for determining a false target using the chirp signal of FIG. 4. If the frequency detected at the k-th time in the jth Chirp of the i-th cycle is denoted by F (k, j, i) .

The first detected frequency in the first chirp of one cycle is F (1,1,1), the second detected frequency is F (2,1,1)

The first detected frequency in the second chirp of one cycle: F (1,2,1), the second detected frequency: F (2,2,1)

The first detected frequency in the first chirp of the two cycles: F (1,1,2), the second detected frequency: F (2,1,2)

The first detected frequency in the second chirp of the two cycles: F (1,2,2), the second detected frequency: F (2,2,2)

The first detected frequency in the first chirp of three cycles: F (1,1,3), the second detected frequency: F (2,1,3)

The first detected frequency in the second chirp of the three cycles: F (1,2,3), the second detected frequency: F (2,2,3)

The target information detected in each cycle is the actual target: (R1, V1), (R4, V4) and the false target: (R2, V2 ), (R3, V3). The tracing processing unit 330 detects the actual target (R1, V1), (R4, V4) as a final target because the variation of the distance R and the velocity V detected in accordance with the period is not large, , V2), (R3, V3 )) in case the detected distance R, the variation of velocity V is BW (bandwidth), T _m (greatly changed depending on the dwell time), so the change in the determined every period BW and T _m (R2, V2), (R3, V3), which are detected, can be increased to prevent detection by the tracking processor 330 as the final target.

If the same chirp profile is used for each cycle, the variation is not large in accordance with each cycle of the false targets (R2, V2, R3, V3) and is detected as the final target in the radar tracking process. The application of the radar system having different chirp profiles can reduce the false target detection as the final target in the radar tracking process (false target detection).

5 shows a false target determination method of a radar for a vehicle according to an embodiment of the present invention.

Referring to FIGS. 1 to 4, in the false target determination method of FIG. 5, the chirp generation unit 310 of the signal processing unit 300 generates a chirp signal according to the chronological order in accordance with the pre-stored chirp profile (S10). In the present invention, the chirp generation unit 310 stores a plurality of chirp profiles according to a cyclic sequence, generates a chirp signal according to a corresponding cycle order, and transmits the generated chirp signal to a transmission unit. That is, chirp signals of different types are generated and output for each period according to the pre-stored chirp profile.

The transmitter 100 generates an FMCW signal corresponding to the chirp signal, radiates the signal as a transmission signal, and simultaneously distributes the transmission signal and transmits it as a local signal to the receiver 200 (S20). Here, since the chirp signals are different from one another every cycle, the transmission signals have different frequencies every week in correspondence with the chirp signals.

A beat having a beat frequency f _b is obtained by receiving a reflection signal reflected from the target as a reception signal and down-converting the reception signal using a frequency difference between the local signal and the reception signal, Generates a signal, converts the bit signal into a digital signal, and transmits the digital signal to the signal processing unit 300 (S30).

The received signal processing unit 320 of the signal processing unit 300 receives the digital signal, analyzes it, and extracts target information (S40). The tracking processing unit 330 of the signal processing unit 300 tracks the target information acquired by the received signal processing unit 320 to determine whether the target is an actual target or a false target and detects an actual target as a final target at step S50. At this time, the tracking processing unit 330 does not set the detected target for one period as the final target, but sets only the target continuously detected for a predetermined number of times (for example, three times or more) as the final target. That is, counts the number of target acquisitions, and sets only the target whose count value is equal to or greater than a predetermined reference count value as the final target. Here, the target detected successively is determined as information on the same target only when the difference between the target information for the target obtained in the previous period and the target information for the target acquired in the subsequent period is within a predetermined reference value And determines that the target is continuously detected.

Then, it is determined whether the operation of the radar is completed or not (S60). If the operation of the radar is not terminated, the number of cycles is increased so that the chirp generator 310 can generate a chirp signal corresponding to the next cycle in the chirp profile (S70). Then, a chirp signal corresponding to the increased number of cycles is generated in accordance with the chirp profile (S10).

As a result, the false target determination method for a vehicle radar according to the present invention generates FMCW signals of different frequencies for each cycle according to a predetermined chirp profile, radiates the FMCW signals as transmission signals, analyzes the continuity of target information obtained from the received signals, And false targets. Therefore, since the false target is easily removed, only the actual target can be set as the final target. Therefore, it is possible to prevent malfunction caused by the false target, thereby improving the reliability of the radar and enhancing the safety at the time of vehicle operation.

The method according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (8)

A transmitter receiving a chirp signal and generating and emitting a transmission signal having a frequency corresponding to the chirp signal;
A receiving unit for receiving the transmission signal reflected from the target and generating a bit signal using the transmission signal transmitted from the transmission unit and the reception signal; And
Generating the chirp signals of different waveforms for each period according to a pre-stored chirp profile, transmitting the generated chirp signals to the transmitter, acquiring target information for the target by receiving and analyzing the bit signals, A signal processing unit for classifying the actual target and the false target by analyzing whether the target is continuous to the actual target and detecting the target information for the actual target as the final target; And a radar. 2. The apparatus of claim 1, wherein the signal processing unit
A chirp signal generator for storing the chirp profile for designating the chirp signals of different waveforms for each cycle and generating chirp signals according to the respective cycles;
A received signal processing unit for receiving the bit signal and signal processing in a predetermined manner to obtain the target information including the speed and distance information of the target; And
Wherein the target information setting unit sets the target information for the actual target to be less than the reference value, and the remaining target information sets the target information for the real target, A tracking processing unit configured to set target information for a false target; And a radar unit for detecting the radar signal. 3. The apparatus of claim 2, wherein the tracking processor
And detects the target information as the final target when target information whose difference of the target information is less than or equal to the reference value is repeated more than a preset count value in successive periods. 2. The apparatus of claim 1, wherein the transmitter
A frequency generator for generating an FMCW signal having a different frequency for each period in response to the chirp signal as the transmission signal;
A frequency divider for dividing the transmission signal and transmitting it as a local signal to the receiver; And
A transmission antenna for radiating the transmission signal to the outside; And a radar unit for detecting the radar signal. 5. The apparatus of claim 4, wherein the receiver
A plurality of reception antennas respectively receiving the reception signals;
A plurality of mixers for generating a bit signal having a bit frequency by down-converting the received signal using a frequency difference between the plurality of reception signals received by the plurality of reception antennas and the local signal; And
An AD converter for converting the bit signal into a digital signal and transmitting the digital signal to the signal processor; And a radar unit for detecting the radar signal. A false target identification method for a vehicle radar having a transmitter, a receiver, and a signal processing unit,
Generating the chirp signals of different waveforms for each period according to a chirp profile stored in the signal processing unit and transmitting the generated chirp signals to the transmitter;
Generating a transmission signal having a frequency corresponding to the chirp signal by receiving the chirp signal transmitted from the signal processing unit;
Generating a bit signal using the transmission signal and the reception signal transmitted from the transmission unit, the reception unit receiving the reception signal in which the transmission signal is reflected to the target;
The signal processing unit receiving and analyzing the bit signal to obtain target information for the target; And
Analyzing whether the acquired target information is continuous for a plurality of times of cycles to distinguish an actual target and a false target, and detecting the target information for the actual target as a final target; And detecting a false target of the vehicle radar. 7. The method of claim 6, wherein detecting
Receiving the bit signal and signal processing in a predetermined manner to obtain the target information including the speed and distance information of the target;
Determines whether the difference of the target information is equal to or less than a preset reference value in a continuous cycle, sets the target information that is equal to or less than the reference value as target information for the real target, and sets the remaining target information as target information for the false target step;
Setting target information for the real target as final target information; And determining a false target of the radar. 8. The method of claim 7, wherein the step of setting to the final target information comprises:
And detects the target information as the final target when the target information whose difference of the target information is less than or equal to the reference value is repeated more than a predetermined count value in successive periods.

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