Space-frequency joint anti-interference implementation method

An implementation method, space-frequency technology, applied in the application field of satellite navigation technology, can solve problems such as difficult calculation of frequency-domain anti-jamming threshold value, failure of frequency-domain interference suppression, etc., to reduce the impact of signal quality and anti-jamming performance, reduce Edge signal distortion, strong practical effect

Active Publication Date: 2014-03-26
SPACE STAR TECH CO LTD
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Problems solved by technology

[0003] At present, the cascading method of frequency domain and airspace is to first use the frequency domain method to suppress narrowband interference, and then implement beamforming in the airspace. When broadband interference and narrowband interference exist at the same time, the spectral line of narrowband interference is not obvious. The threshold value of frequency domain anti-interference will be difficult to calculate, resulting in the failure of frequenc

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[0029] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments:

[0030] Such as figure 1 Shown is a signal processing flow chart of the space-frequency joint anti-jamming method of the present invention. The method for realizing space-frequency joint anti-jamming of the present invention includes the following steps:

[0031] (1) The satellite signal received from the array antenna is processed into a baseband digital signal, specifically: the satellite signal is mixed to an intermediate frequency signal through a single frequency, the intermediate frequency signal is A / D converted, and then the A / D converted The digital signal is subjected to digital down-conversion processing to obtain a baseband digital signal.

[0032] (2) First, perform low-pass filter processing on the baseband digital signal, and then perform integer multiple down-sampling on the digital signal after the low-pass filter processing according to ...

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Abstract

The invention relates to a space-frequency joint anti-interference implementation method. According to the method, an FFT (fast fourier transformation) broadband segmentation method is adopted to segment a broadband signal into multiple narrow-band signals, a sliding window method is adopted to realize repeated FFT in short data, covariance matrix calculation among frequency point signals is realized, a linearly constrained minimum variance criterion is adopted to solve a filter weight of each narrow-band signal, and a mode of alternate splicing of two-way data is adopted to obtain one-way data. Space domain and frequency domain anti-interference methods are fused together to design a high-flexibility anti-interference implementation scheme, interference in various forms such as narrow band, broadband and sweep frequency can be inhibited at the same time, anti-interference capacity of the signals are improved substantially, signal distortion is reduced, and the space-frequency joint anti-interference implementation method is suitable for receiver terminals of various satellite navigation systems.

Description

technical field [0001] The invention belongs to the application field of satellite navigation technology, and relates to a method for implementing space-frequency joint anti-jamming, in particular to a space-frequency joint anti-jamming method using broadband segmentation, which is suitable for receiver terminals of satellite navigation systems such as Beidou and GPS. Various forms of interference can be suppressed. Background technique [0002] Wireless communication technology plays an increasingly important role in the field of modern communication, but because the wireless signal is extremely weak, it is vulnerable to various natural or man-made interferences and cannot be used. Therefore, it is necessary to introduce interference suppression technology to improve the resistance of wireless communication systems. Interference ability. In view of the limited anti-jamming effect of the current anti-jamming technology purely in the air domain, time domain, and frequency do...

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Application Information

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IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 魏婵娟张春水徐振兴车欢刘鹏
Owner SPACE STAR TECH CO LTD
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