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Method for self-adaption mid-value threshold frequency domain anti-jamming

A median threshold and self-adaptive technology, which is applied to the shaping network, electrical components, transmission system, etc. Space requirements, strong real-time performance, and the effect of reducing spectrum leakage

Active Publication Date: 2014-07-09
ZHEJIANG UNIV
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Problems solved by technology

In this way, when performing interference suppression, the interference cannot be completely eliminated or more useful signals have to be lost to filter out the interference

Method used

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  • Method for self-adaption mid-value threshold frequency domain anti-jamming

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Embodiment Construction

[0045] The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments, and the following embodiments do not constitute a limitation of the present invention.

[0046] Such as figure 1 As shown, an adaptive median threshold frequency domain anti-jamming device can be realized on digital devices such as FPGA, CPLD, ASIC, DSP, etc., preprocess the received signal, filter out the narrow-band interference signal in the received signal, and then send it to the pseudo code and carrier capture tracking modules.

[0047] The frequency domain anti-interference algorithm includes a window function module, a memory A module, an FFT module, an interference identification and suppression module, an IFFT module, an automatic gain control module, and a memory B module. The window function module, the memory A module, the FFT module, the interference identification and suppression module, the IFFT module,...

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Abstract

The invention discloses a device and a method for self-adaption mid-value threshold frequency domain anti-jamming. Narrow-band interference signals in a signal bandwidth of a receiving machine can be filtered or removed according to conversion among time-frequency domains with one another. The anti-jamming device comprises a windowing unit; input signals are subjected to windowing processing, are subjected to FFT (Fast Fourier Transform Algorithm) conversion and then are sent to a jamming identifying and restraining unit; and the jamming identifying and restraining unit is used for performing jamming identifying and restraining on frequency domain signals output by an FFT unit and comprises a storage, a jamming removing unit, a power detection unit and a mid-value threshold estimating unit which are connected in sequence, wherein the input end of the power detection unit is connected with that of the storage so as to receive the frequency domain signals, the output end of the power detection unit is connected with the input end of the mid-value threshold estimating unit, the output end of the mid-value threshold estimating unit is connected with the jamming removing unit, and the jamming removing unit can fast remove jamming according to that the jamming in the frequency domain signals can be removed and then output by a mid-value threshold.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to an adaptive median threshold frequency domain anti-jamming device and method. Background technique [0002] Direct sequence spread spectrum system (hereinafter referred to as direct spread system) radio frequency signal bandwidth is much larger than that of narrowband communication system, so it is more susceptible to interference from other radio frequency signals in the same frequency band, especially in military communications, it will also be subject to hostile intentions. interference. When the power of these interfering signals exceeds the maximum interference that the receiver can tolerate, the system cannot work normally. The spread spectrum communication technology itself has a strong anti-interference ability, and its anti-interference ability mainly depends on the size of the spread spectrum processing gain. In practice, the processing gain of a DS system is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/71H04L25/03
Inventor 张朝杰杨伟君袁铁山金仲和金小军
Owner ZHEJIANG UNIV
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