Frequency domain anti-interference method based on improved Rake structure
A frequency domain and intermediate frequency technology, applied in the frequency domain anti-jamming field based on the improved Rake structure, to achieve the effect of improving communication performance, improving signal-to-noise ratio, and reducing anti-jamming loss
Active Publication Date: 2017-02-22
湖南中电星河电子有限公司
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However, how to further improve the signal quality after anti-interference in the frequency domain, such as improving the signal-to-noise ratio or reducing the code tracking variance, there are almost no more research results in this field
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[0031] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0032] Such as figure 1 Shown is the flowchart of the method of the present invention. The frequency-domain anti-jamming signal is equivalent to the direct signal affected by multipath interference, and a frequency-domain anti-jamming algorithm based on an improved Rake structure based on coupled pseudo-code delay estimation is proposed (the Rake structure can be the Rake receiver in the prior art machine). The improved Rake structure coupled with pseudo-code delay estimation is specifically that the pseudo-code delay estimation module completes the code delay estimation of the direct signal and multipath in the frequency domain anti-interference signal, and uses the estimated delay to estimate the direct signal and multipath respectively. track, and finally remove the multipath in the signal after anti-jamming in the frequency domain.
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The invention belongs to the field of satellite navigation anti-interference, and specifically relates to a frequency domain anti-interference method based on an improved Rake structure. The method comprises the steps that (S1) an intermediate frequency sampling signal is input, and the correlation function of a signal after frequency domain anti-interference is calculated to acquire the code delay coarse estimation; (S2) the direct signal tracking result of a channel 0 is acquired; (S3) the multipath signal tracking result of remaining channels except the channel 0 is acquired; and (S4) a direct signal after multipath removing is calculated. According to the invention, the frequency domain anti-interference method inevitably leads to the degradation of the signal quality while suppressing the interference, and in particular in the face of broadband interference; anti-interference loss can be reduced to a certain extent by the method; the signal-to-noise ratio of the signal after frequency domain anti-interference is improved; the bit error rate of navigation data demodulation is reduced; and the communication performance of a receiver is improved.
Description
technical field [0001] The invention belongs to the field of satellite navigation anti-jamming, in particular to a frequency-domain anti-jamming method based on an improved Rake structure. Background technique [0002] To counter unintentional radio frequency jamming in the environment or hostile malicious jamming, most military Global Navigation Satellite System (GNSS) receivers have been equipped with frequency-domain anti-jamming measures. However, frequency domain anti-interference measures will introduce anti-interference loss, such as signal-to-noise ratio loss and signal distortion, while suppressing interference. As GNSS receivers are more and more widely used in high-precision fields, such as civil aviation landing systems and precision approach systems, the requirements for positioning accuracy of GNSS receivers are getting higher and higher. The signal-to-noise ratio loss and signal distortion introduced by anti-interference measures need to be improved or even e...
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IPC IPC(8): G01S19/21
CPCG01S19/21
Inventor 王飞雪李建聂俊伟耿正霖鲁祖坤陈飞强伍微彭竞王勇
Owner 湖南中电星河电子有限公司