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Vehicle ranging method based on hybrid correlation reception and error iteration

A technology related to receiving and ranging methods, applied in the fields of positioning navigation and wireless ranging, can solve the problem of inability to carry out multi-vehicle serial collision warning and other problems, and achieve the effect of excellent ranging accuracy

Inactive Publication Date: 2019-04-02
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a vehicle distance measurement method based on hybrid correlation reception and error iteration to overcome the problem that the existing vehicle distance measurement can only realize adjacent vehicle distance measurement and cannot perform multi-vehicle serial collision warning

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  • Vehicle ranging method based on hybrid correlation reception and error iteration
  • Vehicle ranging method based on hybrid correlation reception and error iteration
  • Vehicle ranging method based on hybrid correlation reception and error iteration

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Embodiment Construction

[0037] Embodiments of the present invention will be described below in conjunction with the accompanying drawings. In the embodiment, it is assumed that the propagation delay of the signal is 191 sampling points, and the main process is as follows figure 1 shown. in:

[0038] A. Autocorrelation: The current traditional time synchronization method is mainly used in wireless positioning systems, focusing on autocorrelation or cross-correlation reception. .11p OFDM signal is received, and the received signal r first performs autocorrelation calculation to obtain P SC ; To overcome the platform effect, for P SC Then perform the fixed-window sliding averaging operation, and the result is M C , the specific calculation method is:

[0039]

[0040] B. Mutual exchange: use a short training symbol sequence in the IEEE 802.11p protocol as the template signal S, the length is 16, and the frequency shift correction signal r of the received signal corT Perform cross-correlation op...

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Abstract

The invention belongs to the technical field of wireless ranging and positioning, specifically discloses a vehicle ranging method based on hybrid correlation reception and error iteration. The methodmainly comprises five steps: A. performing an autocorrelation calculation on a received signal of an IEEE802.11p protocol, performing a fixed window sliding calculation on the result and then meaning,wherein the result is Mc; B. making a short preamble as a template signal and performing a cross-correlation calculation between the template signal and a frequency shift correction signal of the received signal, and then correlating with the autocorrelation result Mc; C. grouping the hybrid correlation results, wherein each group has 9 samples with interval 16, and summing respectively to obtaina time delay estimation sequence Sopt; D. calculating the mean absolute error madG of all samples before the Sopt maximum in the summation sequence, if not satisfies with madG[1]>0.9 and madG[10]<0.01, setting Sopt[PeakIndex] to 0 to continue the loop iteration, and otherwise, returning the subscript PeakIndex corresponding to the Sopt maximum value; and E. calculating the distance according to PeakIndex. The vehicle ranging method based on the hybrid correlation reception and the error iteration can improve the accuracy of the vehicle ranging in environments with multipath, non-direct view and high Doppler frequency shift.

Description

technical field [0001] The invention belongs to the field of wireless ranging, positioning and navigation, and can be used for high-precision wireless positioning of vehicles using the IEEE 802.11p protocol in the Internet of Vehicles, specifically a vehicle ranging method based on hybrid correlation reception and error iteration. Background technique [0002] According to the 2015 report of the World Health Organization, even if road traffic safety is improved, the annual death toll from traffic accidents is still as high as 1.25 million, and young people aged 15-29 become the main group. Cooperative collision avoidance or warning systems in vehicle applications can help predict potential hazards and reduce the probability of accidents, which can effectively reduce vehicle collisions, thereby mitigating damage and saving lives in the future. In ITS (Intelligent Transportation System), vehicle positioning technology can provide vehicle collision warning, so the requirement f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S11/00
CPCG01S11/00
Inventor 崔学荣李井真李娟集美琪杨瑾张勇江垚乐
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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