Outer radiation source radar direct wave suppression method being suitable for WiFi

A technology of external radiation source radar and direct wave, which is applied in radio wave measurement system, shaping network in transmitter/receiver, digital transmission system, etc., to achieve the effect of less computation and improved detection performance
CN108270701AActive Publication Date: 2018-07-10WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUHAN UNIV
Publication Date
2018-07-10

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Abstract

The invention discloses an outer radiation source radar direct wave suppression method being suitable for WiFi. The outer radiation source radar direct wave suppression method being suitable for WiFiincludes the steps: by means of a least square channel estimation algorithm and an FIR filter, obtaining each subcarrier channel estimation value, and extracting each subcarrier channel estimation phase; by means of a pilot signal, extracting the residual frequency offset phase, and combined with each subcarrier channel estimation phase, obtaining the residual phase of each subcarrier channel; performing one time of curve fitting by means of each subcarrier residual phase to estimate fractional times of delay of the direct wave; through three times of batten interpolation and fractional timesof delay displacement of the direct wave, obtaining a reference signal after correction of time delay; and suppressing the direct wave of the monitoring signal by means of an expansion cancellation batch processing algorithm. Compared with the prior art, the outer radiation source radar direct wave suppression method being suitable for WiFi can improve the direct wave suppression performance of the monitoring channel, is conductive to target detection of a radar system, and is simple in the implementation method.
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Description

technical field

[0001] The invention belongs to the technical field of passive radar and the field of communication technology, and in particular relates to a method for suppressing the direct wave of an external radiation source radar monitoring channel signal based on a WiFi signal when there is a fractional delay of the direct wave at a radar receiving end. Background technique

[0002] External radiation source radar has been extensively studied by the radar community because of its advantages of good concealment and no spectrum occupation. OFDM waveform digital signals that have been studied as non-cooperative irradiation sources of external radiation sources include: DAB (Digital Audio Broadcasting), DVB-T (Digital Video Broadcasting), DTMB (Digital Terrestrial Television), CMMB (China Digital Mobile multimedia video broadcasting), WiFi signal, mobile communication signal, etc.

[0003] Among them, the WiFi signal based on the IEEE wireless local area network standard...

Claims

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