Method and device for acquiring number of multiple target of vehicle-mounted millimeter wave radar system

A millimeter-wave radar and acquisition method technology, applied in the field of vehicle radar, can solve the problems of inaccurate target detection and missed target detection, and achieve the effect of accurate detection and high real-time performance

Active Publication Date: 2016-03-23
DALIAN ROILAND SCI & TECH CO LTD
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Problems solved by technology

[0008] In order to solve the problems of inaccurate target detection and missed detection of targets in the vehicle-mounted millimeter-wave radar multi-target detection in the prior art, the solution of the present invention is proposed, which makes the detection of multiple targets more accurate and real-time. Engineering realization and application have good value

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  • Method and device for acquiring number of multiple target of vehicle-mounted millimeter wave radar system

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Embodiment 1

[0057] Embodiment 1: a method for multi-target detection of a vehicle-mounted millimeter-wave radar system, comprising the following steps:

[0058] 1. Transmit periodic combined waveforms of FMCW and CW; transmit FMCW waveforms in the first period, transmit FMCW waveforms different from the first period in the second period, and transmit CW waveforms in the third period;

[0059] 2. Receive the echo signal, and perform fast Fourier transform (FFT transform) on the received echo signal;

[0060] Because after the FFT changes, multiple similar values ​​will pass the constant false alarm detection, which increases the amount of calculation and the false alarm rate. Therefore, in order to make the CW obtain the velocity value more accurately and reduce the search for similar velocities in the FMCW velocity matrix, before performing velocity pairing,

[0061] 3. Use the frequency clustering algorithm to obtain the Doppler frequency matrix of the CW waveform echo signal, and calcu...

Embodiment 2

[0063] Embodiment 2: It has the same technical solution as Embodiment 1, more specifically: because the value of the real target and the false target is included in the velocity and distance matrix obtained by FMCW. Therefore, the following steps are required afterwards, including:

[0064] 5. According to the speed matching algorithm, the speed matrix obtained by CW is matched with the speed matrices obtained by the first cycle FMCW and the second cycle FMCW, and the rows and columns of the speed matrix are recorded respectively.

[0065] 6. According to the row and column positions obtained in the speed matrix, the values ​​on the corresponding rows and columns in the distance matrix are respectively used as the distance values ​​of the corresponding targets.

Embodiment 3

[0066] Embodiment 3: have the technical scheme identical with embodiment 1 or 2, more specifically: in order to further accurately obtain the number of multi-targets, and corresponding speed value and distance value, obtain distance and distance for two FMCW cycles The speed value is to establish a fault-tolerant function of distance and speed, which is further determined as the speed value and distance value of the final target.

[0067] Embodiment 4: the multi-target detection method of the vehicle-mounted millimeter-wave radar system has the same technical solution as any item of embodiment 1-3, and more specifically, carries out the frequency aggregation algorithm to the frequency value of the threshold detected for the first time, and the frequency The agglomeration algorithm is as follows:

[0068] 1. Establish a set of all frequencies that pass the threshold, and create a related frequency set A for frequencies with similar frequency values, where the number of elements...

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Abstract

The invention relates to a method and a device for acquiring number of multiple targets of a vehicle-mounted millimeter wave radar system. The method and the device belong to the field of vehicle-mounted radars, and are used for solving the problems of inaccurate target detection and missing detection of targets in vehicle-mounted millimeter wave radar multi-target detection. The technical key point of the method comprises the steps of: transmitting periodic FMCW and CW combined waveforms; receiving echo signals, and performing fast Fourier transform on the received echo signals; adopting a frequency clustering algorithm, solving a Doppler frequency matrix of the CW-waveform echo signals, and calculating a relative velocity matrix; and adopting a frequency agglomeration algorithm in FMCW up-down frequency sweeping, acquiring frequency values of up-down frequency sweeping, and calculating a velocity matrix and a distance matrix of targets. The method and the device have the effect that target detection in vehicle-mounted millimeter wave radar multi-target detection is more accurate.

Description

technical field [0001] The invention belongs to the field of vehicle-mounted radar, and in particular relates to a method and a device for acquiring the number of multiple targets of a vehicle-mounted millimeter-wave radar system. Background technique [0002] With the continuous development of intelligent transportation system research, more and more radar sensors are needed in the fields of automobile cruise control and anti-collision radar control, and radar sensors will definitely play a more important role in automobile safety and comfortable driving. Compared with general radars, linear frequency-modulated continuous wave (LFMCW) radar has a large time-band product, so it has high speed resolution and distance resolution in theory. In addition, it has the advantages of simple structure, small size and light weight. , especially suitable for radar imaging, target feature research and other fields. However, when the LFMCW radar detects moving targets, the range-velocity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 田雨农王鑫照周秀田史文虎
Owner DALIAN ROILAND SCI & TECH CO LTD
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