Spread spectrum receiver multiple-access interference suppression method based on frequency spectrum detection

A technology of spectrum detection and interference suppression, which is applied in the field of multiple access interference suppression of spread spectrum receivers based on spectrum detection, can solve problems such as difficulties in engineering implementation, limited use environment, and large amount of algorithm calculation, so as to suppress the impact of interference , reduce capture time, simple algorithm effect

Active Publication Date: 2015-12-02
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

[0004] The above-mentioned existing multi-user detection technology or blind multi-user detection technology has complex technical princ

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  • Spread spectrum receiver multiple-access interference suppression method based on frequency spectrum detection
  • Spread spectrum receiver multiple-access interference suppression method based on frequency spectrum detection
  • Spread spectrum receiver multiple-access interference suppression method based on frequency spectrum detection

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[0022] Below in conjunction with accompanying drawing and specific embodiment the present invention will be described in further detail:

[0023] The spread spectrum signal acquisition carried out in the receiver includes Doppler carrier acquisition and spread spectrum code phase acquisition. Among them, spacecraft products have the characteristics of large Doppler frequency dynamic range, so the partial correlation FFT algorithm of frequency domain parallel search is usually used. When this method is used to capture spread spectrum signals, if there is no interference or the multiple access interference is weak, When submerged below the noise, when the pseudo-code phase generated locally is aligned with the pseudo-code phase of the received signal, the FFT operation result has a single peak, and the position of the peak can be detected by setting the corresponding threshold reasonably, which is the Doppler frequency. Partial. However, if the multiple access interference powe...

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Abstract

The invention provides a spread spectrum receiver multiple-access interference suppression method based on frequency spectrum detection. On the basis of a traditional partial correlation FFT spread spectrum signal acquisition algorithm, through utilization of an autocorrelation spectral characteristic of a spread spectrum code and a cross-correlation spectral characteristic of cognate codes, double detection of a useful signal and multiple-access interference is performed on a received signal, to which the multiple-access interference is superposed, through the method, and the multiple-access interference can be suppressed in a spread spectrum signal pseudo code and carrier capture stage; and, through application of the method in a spread spectrum receiver, the problem of pseudo code or carrier wrong capture caused by the fact that the multiple-access interference exists is solved. The method has the advantages of easy implementation, the obvious multiple-access interference resistance effect and the like.

Description

technical field [0001] The invention relates to the technical field of anti-interference of measurement and control signals, in particular to a method for suppressing multiple access interference of a spread spectrum receiver based on spectrum detection. Background technique [0002] At present, the direct sequence spread spectrum measurement and control system is widely used in the field of relay measurement and control and ground-based measurement and control. Spacecraft measurement and control has the characteristics of large dynamic range of receiving level and large dynamic range of frequency Doppler. The number of spacecraft in orbit is also gradually increasing, and the phenomenon of multiple access interference between spacecraft measurement and control products appears from time to time. Therefore, in order to ensure the security of spacecraft measurement and control links, it is necessary to develop Spacecraft measurement and control products. [0003] Analyzed th...

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Application Information

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IPC IPC(8): H04B1/7103
Inventor 杨克元秦玉峰刘灵马亚梅李静澜
Owner XIAN INSTITUE OF SPACE RADIO TECH
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