一种基于信噪比估计的自适应伪码捕获算法

Abstract

Abstract: The missile control and guide command link generally uses burst short frames.This kind of link possesses short communication time,high reliabiliy and a large dynamic scope of signals.A fixed threshold is not suitable for this kind of communications.The higher threshold will lead to the virtual alarm probability too high in high SNR,and the lower threshold will lead to the miss detect probability too high and the detect probability too low in low SNR.So an adaptive acquisition algorithm of PN codes for burst short frames is presented.The algorithm is suitable for the condition that AGC is applied before the ADC.The adaptive acquisition is based on the SNR estimate.An applied algorithm by which the SNR can be obtained from the statistical ratio samples is presented.The polynomial fitting method is carried out for realization in practice.Simulation results verify that the proposed algorithm is effective.

CLC Number:

TN92

WANG Zu-liang, WANG Ming-yi, WANG Li-bin, ZHENG Lin-hua. Adaptive acquisition algorithm of PN codes based on SNR estimate[J]. Journal of Systems Engineering and Electronics, 2009, 31(6): 1307-1310.

References

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Adaptive acquisition algorithm of PN codes based on SNR estimate

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