基于互相关移位相乘BOC (m,n)无模糊捕获算法

doi:10.7527/S1000-6893.2021.25897

Abstract

Abstract: To solve the problem of acquisition ambiguity caused by the multiple peaks of Binary Offset Carrier (BOC) modulation signals, a shift multiplication unambiguous acquisition algorithm is proposed based on separation and reconstruction of the BOC/PRN(Pseudo Random Noise) cross-correlation function. According to the characteristics of the cross-correlation function between the BOC signal and the pseudo-random code, the sub-correlation functions with respect to the symmetry of the origin with a certain delay are multiplied and the multiplied results are added to eliminate the effect of side peaks. To further improve the acquisition performance, a fast algorithm is proposed based on this algorithm. Comparison of the computing complexity and simulation results of the two algorithms shows that the fast algorithm, while maintaining the advantages of narrow correlation peak characteristics, can completely eliminate the existence of the peak, and can be applied to any modulation order of BOC signal. Compared with the traditional BOC unambiguous algorithm, the detection probability of the shift-multiplication algorithm is about 3.5 dBHz better than that of the ASPeCT(Auto correlation Side-Peak Cancellation Technique) method, but the computation of the algorithm is large and increases with the increase of the modulation order. The detection probability of the fast algorithm is about 3 dBHz better than that of the ASPeCT method; and the computation of the algorithm is reduced by 40%.

Key words: BOC signal acquisition, cross-correlation function, decomposition and reconstruction, unambiguous, side-peak cancellation

CLC Number:

V249.32

LI Ming, HU Hui, GUO Meng, YU Fei, XIE Hongqun. Unambiguous acquisition algorithm based on cross-correlation function shift multiplication for BOC (m,n) signals[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(8): 325897.

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Unambiguous acquisition algorithm based on cross-correlation function shift multiplication for BOC (m,n) signals

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