Time domain clutter suppression method suitable for LTE external radiation source radar

A technology for external radiation source radar and clutter suppression, applied in radio wave measurement systems, instruments, etc., to improve clutter suppression performance and suppression speed, reduce hardware resource consumption, and facilitate real-time processing

Active Publication Date: 2020-01-03
SHENZHEN RES INST OF WUHAN UNIVERISTY
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Problems solved by technology

[0014] Aiming at the problems caused by the fractional delay of external radiation source radar clutter, the present invention proposes a LTE external radiation source radar clutter suppression method

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  • Time domain clutter suppression method suitable for LTE external radiation source radar
  • Time domain clutter suppression method suitable for LTE external radiation source radar
  • Time domain clutter suppression method suitable for LTE external radiation source radar

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Embodiment Construction

[0111] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit this invention.

[0112] In the embodiment of the present invention, the signal is an LTE signal in FDD mode, the bandwidth is 15 MHz, and the sampling rate of the receiving end is 23.04 MHz. The present invention provides a radar clutter suppression method suitable for LTE external radiation sources. The method flow chart of the embodiment of the present invention is as follows Figure 4 , including the following steps:

[0113] Step 1, establish the LTE external radiation source radar detection signal model, and perform fractional interpolation; including the following sub-...

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Abstract

The invention discloses a time domain clutter suppression method suitable for LTE external radiation source radar. According to the method, an original monitoring signal is subjected to sinc functioninterpolation to obtain a monitoring signal linearly combined by limited integer delay reference signals; the interpolated monitoring signal and the reference signal are segmented separately; the segmented monitoring signal, the reference signal and a filter weight are subjected to fast Fourier transform, so that the signal is transformed from the time domain to the frequency domain; clutter suppression is performed according to the minimum mean square algorithm in the frequency domain, and adaptive variable step weight updating is carried out; and finally, the output results of each segment are combined. Compared with the prior art, the method has the advantages that accurate estimation of the fractional delay time is not needed, the interpolated monitoring signal and the reference signalare subjected to batch minimum mean square adaptive filtering; and when the estimated value is close to the real value, the output result is the required target echo signal, the clutter suppression performance of the monitoring channel is improved, and the target detection of a radar system is facilitated.

Description

technical field [0001] The invention belongs to the field of passive radar technology and communication technology, and especially relates to the presence of direct wave and fractional delay multipath clutter in the received signal of LTE external radiation source radar, and proposes a monitoring based on fractional interpolation The signal processing and variable step size self-adaptive minimum mean square clutter suppression method can improve the performance and speed of clutter suppression, reduce the consumption of system hardware resources, and facilitate real-time processing. Background technique [0002] The so-called external radiation source radar is also called passive radar, opportunistic radar, etc. Compared with the active radar system of the traditional system, the receiving system of the external radiation source radar is completely passive, does not radiate any electromagnetic waves, but receives and processes target reflection The time delay information, Do...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/36
CPCG01S7/023G01S7/36
Inventor 饶云华王雅莉王胜涛胡海霞周健康潘登聂文洋
Owner SHENZHEN RES INST OF WUHAN UNIVERISTY
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