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Effective method for accurately detecting multiple targets by automobile blind zone monitoring radar

A multi-target, radar technology, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation and other directions, can solve the problems of limited measurement accuracy, distance and speed coupling, etc.

Inactive Publication Date: 2012-07-25
HOHAI UNIV
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: for the FMCW signal with a single FM slope, there is a range-velocity coupling problem, and the measurement accuracy is limited when FFT analyzes the difference frequency signal, and an effective method for accurately detecting multiple targets by a blind spot monitoring radar is proposed. method

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  • Effective method for accurately detecting multiple targets by automobile blind zone monitoring radar
  • Effective method for accurately detecting multiple targets by automobile blind zone monitoring radar
  • Effective method for accurately detecting multiple targets by automobile blind zone monitoring radar

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Embodiment Construction

[0037] The effective method for accurately detecting multiple targets provided by the present invention will be further described below in conjunction with the accompanying drawings.

[0038] The FMCW radar target model among the present invention is as figure 1 shown. In the figure, f c is the center frequency of the modulation signal, B is the modulation bandwidth, T m Is the modulation cycle, and t represents the time. The transmitted signal is a triangular FM continuous wave, and the waveform received after passing through the moving target, except for a time delay t d In addition, it also contains a Doppler frequency offset f d . The difference frequency signal can be obtained after mixing the sending signal and the echo signal, and the frequencies of the difference frequency in the rising section and the falling section are respectively f bu and f bd . The distance and speed of the target can be measured by analyzing the difference frequency signal:

[0039] ...

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Abstract

The invention discloses an effective method for accurately detecting multiple targets by an automobile blind zone monitoring radar. Aiming at the distance speed coupling problem of frequency modulated continuous wave (FMCW) signals with single frequency modulation slope, the invention provides FMCW radar emitting signals with variable frequency modulation slope for accurately detecting real targets on the basis of variable-period FMCW signals. Aiming at the measurement precision limitation problem during fast fourier transform (FFT) difference frequency signal analysis, different distances and speed errors are obtained by time domain taking and frequency domain interpolating methods according to different target distances. When targets are in a remote distance, rough distance and speed information is obtained only through FFT analysis; and for targets in middle distance and short distance, traffic accidents can more easily occur, so the time domain taking and frequency domain interpolating methods are used for measuring more precise distance and speed. The effective method can be used for the multi-target detection of the automobile blind zone monitoring radar in the road traffic safety field.

Description

technical field [0001] The invention belongs to the road traffic safety field of automobile blind spot monitoring radar, relates to a detection method in the field of automobile blind spot monitoring radar target detection, and is suitable for a frequency modulated continuous wave (FMCW) automobile radar system. Background technique [0002] With the continuous development of modern transportation and the automobile industry, the construction of expressways has developed rapidly in recent years, the speed of automobiles is getting faster and faster, and the traffic volume is also increasing. What follows is the frequent occurrence of traffic accidents. The causes of automobile collisions are very complicated, including the factors of the vehicle itself, human factors, and environmental factors such as roads and weather. Among the above-mentioned many factors, the human factor is the main cause of automobile collision. The analysis of road traffic accidents shows that more ...

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Application Information

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IPC IPC(8): G01S13/93
Inventor 曹宁屈飞园刘伟伟
Owner HOHAI UNIV
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