Multi-target recognition method of vehicle radar based on FMCW

A technology of vehicle-mounted radar and identification method, which is applied in the directions of reflection/re-radiation of radio waves, utilization of re-radiation, measurement devices, etc., which can solve the problems of slow system response time, difficult to determine matching conditions, and no indication of the size of the periodic change. Achieve the effect of avoiding false targets, moderate calculation speed, and distance avoidance

Active Publication Date: 2018-05-08
CENT SOUTH UNIV
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Problems solved by technology

In the above-mentioned processing method, powerful computing resources are required for frequency matching, and the matching conditions are difficult to determine in practical use, and the system response time is slow, so it is difficult to determine the correct speed and distance information of multiple targets in front of the vehicle in real time
Another example is the method of variable-period trapezoidal modulation wave, which identifies and eliminates false targets by changing the cycle of th...

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  • Multi-target recognition method of vehicle radar based on FMCW
  • Multi-target recognition method of vehicle radar based on FMCW
  • Multi-target recognition method of vehicle radar based on FMCW

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Embodiment 1

[0040] see figure 1 , the present invention discloses a multi-target recognition method for vehicle radar based on FMCW system. Each cycle of the frequency-modulated continuous wave emitted by it is composed of three modulated waves with the same cycle but different frequency sweep time duty ratios on the triangular wave. The period of the three bands is T, and the time of the triangular band and the constant frequency band in the single cycle is Proportion of frequency sweep time on the triangular band in the first cycle α 1 =0.3, the proportion of sweeping time on the triangular band in the second period α 2 =0.35, the proportion of sweeping time on the triangular band in the third period α 3 = 0.4.

[0041] In this embodiment, set the FM starting frequency f 1 =76.5GHZ, FM cut-off frequency f 2 = 76.9GHZ, FM bandwidth B = 400MHZ, modulation wave single-cycle duration T = 6ms. There are four moving targets in front of the vehicle, and the parameters of the targets in ...

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Abstract

The invention discloses a multi-target recognition method of vehicle radar based on FMCW. The method includes the following steps: vehicle radar continuously emits frequency modulated continuous wavesto the front, wherein the frequency modulated continuous wave in each period is composed of three sub periodic modulated waves, the periods of the sub periodic modulated waves are T, and each sub periodic modulated wave is composed of a triangular wave band and a constant frequency band; mixing the emitted frequency modulated continuous waves and the received echo, and outputting beat signals; performing FFT operation on the beat signals of the upper sweep frequency band, the lower sweep frequency band and the constant frequency band in the same period, and extracting the main frequency; matching the upper sweep frequency band, the lower sweep frequency band and the constant frequency band corresponding to each target in the same period; calculating the speed and distance of each target according to a corresponding frequency group obtained; and finally, taking the distance and speed simultaneously detected in three periods as the distance and speed of a real target. The false judgmentrate of false targets is reduced, and the correctness of target recognition is improved.

Description

technical field [0001] The invention belongs to the technical field of millimeter wave radar signal processing, and in particular relates to an FMCW-based vehicle radar multi-target recognition method. Background technique [0002] In recent years, with the rapid development of my country's road transport, the number of private vehicles has increased, and the reduction of urban road driving environment has caused an increase in the number of collisions and scratches caused by cars when driving on the road. Vehicle-mounted radar system, as a hotspot in the field of automotive active safety control and assisted driving research, can assist drivers in real-time monitoring of people, vehicles and other environments that affect road safety, actively intervene in driving in critical situations, and assist drivers in their actions. Make the right handling to prevent the car from colliding. Because millimeter waves have the advantages of high resolution, low probability of intercep...

Claims

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Application Information

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IPC IPC(8): G01S13/93G01S7/41
CPCG01S7/411G01S13/931
Inventor 张炎文王国才雷文太
Owner CENT SOUTH UNIV
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