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A Multiple Access Interference Suppression Method for Spread Spectrum Receiver Based on Spectrum Detection

A spectrum detection and interference suppression technology, applied in the field of multiple access interference suppression of spread spectrum receivers based on spectrum detection, can solve the problems of difficult implementation in engineering implementation, complex technical principles, limited use environment, etc. The effect of reducing capture time and simple algorithm

Active Publication Date: 2018-01-05
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 principles, limited use environment, and large amount of algorithm calculation, which are difficult to realize in engineering implementation.

Method used

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  • A Multiple Access Interference Suppression Method for Spread Spectrum Receiver Based on Spectrum Detection
  • A Multiple Access Interference Suppression Method for Spread Spectrum Receiver Based on Spectrum Detection
  • A Multiple Access Interference Suppression Method for Spread Spectrum Receiver Based on Spectrum Detection

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Embodiment Construction

[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 method for suppressing multiple access interference of a spread spectrum receiver based on spectrum detection. On the basis of the traditional partial correlation FFT spread spectrum signal acquisition algorithm, the method utilizes the autocorrelation spectrum characteristics of the spread spectrum code and the relationship between the codes of the same family. The cross-correlation spectrum characteristics between them, double detection of useful signal and multiple access interference on the received signal superimposed with multiple access interference, can suppress multiple access interference in the stage of spread spectrum signal pseudo-code and carrier acquisition, this method in spread spectrum The application in the receiver solves the problem of false code or carrier error capture caused by the existence of multiple access interference. The method has the characteristics of simple implementation and obvious effect of anti-multiple access interference.

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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Patent Type & Authority Patents(China)
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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