Correlation receiving-based vehicle wireless distance measurement method
A technology of wireless distance measurement and related reception, which is applied in the field of wireless distance measurement and positioning, which can solve problems such as the inability to perform multi-vehicle serial collision warning, and achieve the effect of excellent distance measurement accuracy
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[0025] The following describes the embodiments of the present invention with reference to the 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 group summation value should theoretically be 191+9=200.
[0026] figure 1 It is the overall flow chart of the vehicle wireless ranging method based on correlation reception of the present invention. The specific implementation of the ranging method is as follows:
[0027] A. Perform correlation calculation and normalization of the received signal: In the IEEE802.11p protocol, the conjugate value of 160 samples of the short training sequence is used 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:
[0028] P ( d ) = X m = 0 15 r ( d + ...
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