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A coherent processing method for multi-frequency wifi external radiation source radar

A technology of external radiation source radar and processing method, which is applied in the processing based on the coherent synthesis of multi-frequency WiFi external radiation source radar signals, and in the field of multi-frequency WiFi external radiation source radar coherent processing, which can solve the problem that the improvement of distance resolution is not obvious and other problems, to achieve the effect of obvious improvement and obvious distance resolution

Active Publication Date: 2021-10-22
WUHAN UNIV
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Problems solved by technology

The multi-frequency RD spectrum superposition can improve the output signal-to-noise ratio of the matched filter, but the improvement of the distance resolution is not obvious

Method used

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  • A coherent processing method for multi-frequency wifi external radiation source radar
  • A coherent processing method for multi-frequency wifi external radiation source radar
  • A coherent processing method for multi-frequency wifi external radiation source radar

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Embodiment Construction

[0052] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0053] figure 1 For the IEEE802.11g protocol OFDM mode physical layer frame structure, by figure 1 It can be seen that the signal structure is mainly composed of preamble symbol, signal and data. The present invention mainly uses its data part to detect. The baseband complex signal expression of the data part is:

[0054]

[0055]

[0056] Among them, r is the number of OFDM symbols in the data part, R is the number of OFDM symbols; k is the number of subcarriers, N ST =64 is the number of subcarriers of an OFDM symbol; d r,k is the complex modulation information of the kth subcarrier of the rth symbol; Tp is the effective part time length of an OFDM symbol, and the subcarrier frequency interval is Δf=1 / Tp; Tp d is the time length of preamble symbol and signal part, T g cyclic prefix time length for one OFDM symbol, T s That is, the d...

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Abstract

The invention discloses a multi-frequency WiFi external radiation source radar coherent processing method. The WiFi signal is a multi-carrier signal modulated by OFDM, so the orthogonality of the subcarriers can be used to perform spectrum synthesis on multiple WiFi signals of different frequencies to improve the detection performance. The method of the present invention demodulates multiple baseband signals with different carrier frequencies of multiple WiFi signals, performs spectrum shift on one of the signals so that its spectrum is just spliced ​​with the spectrum of the other signal without overlapping, and uses the spliced ​​signal for target detection . The method of the invention can improve the distance resolution of the external radiation source radar system, and at the same time improve the output signal-to-noise ratio after matching filtering, which is beneficial to target detection.

Description

technical field [0001] The invention belongs to the technical field of external radiation source radar target detection, and in particular relates to a multi-frequency WiFi external radiation source radar coherent processing method, which is a processing method based on multi-frequency WiFi external radiation source radar signal coherent synthesis. Background technique [0002] The external radiation source radar uses electromagnetic waves emitted by a third party as the radiation source to detect targets. It has the advantages of environmental protection, strong anti-strike capability, and does not occupy spectrum. The WiFi signal based on the IEEE wireless LAN standard (802.11) has covered most of the city. , because of its wide coverage and the ambiguity function close to the ideal pushpin shape after subpeak suppression, it is very beneficial for passive detection. [0003] The targets for wall-penetrating detection using WiFi signals as external radiation sources are ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S5/02
CPCG01S5/02
Inventor 饶云华纪赛飞万显荣周健康王雅莉胡海霞
Owner WUHAN UNIV
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