Vehicle wireless distance measurement method based on standard deviation iteration

A wireless ranging and standard deviation technology, applied in the field of wireless positioning and 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: 2015-12-30
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Application Information

AI Technical Summary

Benefits of technology

This technology improves on previous systems by combining signals from different sources together for improved range measurements over multi-path or fast moving environments. It also allows for more accurate ranging when combined with low speed movement caused by rain gearing. Overall, these technical improvements improve safety measures during car collisions while still being effective at detecting approaching objects accurately.

Problems solved by technology

Technological Problem addressed in this patents relates to improving accuracy when measuring distances from nearby objects without being blocked or delayed through other methods like radar signals.

Method used

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  • Vehicle wireless distance measurement method based on standard deviation iteration
  • Vehicle wireless distance measurement method based on standard deviation iteration
  • Vehicle wireless distance measurement method based on standard deviation iteration

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Embodiment Construction

[0029] 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, at this time, the subscript of the maximum value of group summation should theoretically be 191+9=200.

[0030] The specific implementation of the distance measurement method is as follows:

[0031] A. Correlation calculation and normalization of the received signal: In the IEEE802.11p protocol, the conjugate value of the 160 samples of the short training sequence is used as the template signal to perform correlation calculation with the received signal, and the result P(d) Then divide by the signal energy R(d) to perform normalization processing, the processing result is M(d), the specific calculation method is:

[0032] P ( d ) = Σ m = ...

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Abstract

The invention belongs to the technical field of wireless distance measurement and positioning and particularly relates to a vehicle wireless distance measurement method based on standard deviation iteration. The vehicle wireless distance measurement method mainly comprises four steps: A, performing correlation calculation and normalization processing on IEEE802.11p protocol receipt signals; B, performing grouping summation on the statistical result to obtain a summation sequence S; C, judging the normalized standard deviation stdS of the group comprising 16 samples in at least 160 samples in front of the maximum value of the current summation sequence S, if stdS [1] greater than 0.9 and stdS [10] smaller than 0.1 are not met, assigning the maximum value of the summation sequence S as 0 and continuing loop iteration, otherwise, returning to the subscript PeakIndex of the maximum value in the summation sequence S; D, calculating to obtain the distance according to the PeakIndex. According to the invention, correlation, summation and standard deviation iteration are used in wireless positioning of the IEEE802.11p protocol for the first time and can improve the vehicle distance measurement accuracy under the multipath, non-orthoptic and high Doppler shift environment.

Description

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Claims

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Application Information

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Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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