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Multi-frequency WiFi external radiation source radar coherent processing method

A technology of external radiation source radar and processing method, applied in the coherent processing of multi-frequency WiFi external radiation source radar, based on the processing field of multi-frequency WiFi external radiation source radar signal coherent synthesis, 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: 2018-09-18
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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  • Multi-frequency WiFi external radiation source radar coherent processing method
  • Multi-frequency WiFi external radiation source radar coherent processing method
  • Multi-frequency WiFi external radiation source radar coherent processing method

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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. A WiFi signal is a multi-carrier signal using OFDM for modulation, thus a plurality of WiFi signals at different frequencies can be subjected to spectrum synthesizing by utilizing orthogonality of sub-carriers, thereby improving the detection performance. The multi-frequency WiFi external radiation source radar coherent processing method disclosed by the invention utilizes different carrier frequencies of the multiple paths of WiFi signals to demodulate multiple paths of baseband signals,one path of signals is subjected to frequency spectrum shifting so that the frequency spectrum thereof is just spliced with the frequency spectrum of another path of signals without overlapping, andthe frequency-spectrum-spliced signals are used for target detection. The multi-frequency WiFi external radiation source radar coherent processing method disclosed by the invention can improve the range resolution of an external radiation source radar system, improves an output signal-to-noise ratio after matched filtering, and is beneficial for 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...

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Application Information

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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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