正弦调频干扰下二进制偏移载波的精确捕获

doi:10.3969/j.issn.1001-506X.2020.11.26

Abstract

Abstract:

Aiming at the problem of capture difficult of binary offset carrier (BOC) signal under the sinusoidal frequency modulation (SFM) interference, an improved algorithm of interference suppression capture based on discrete SFM transform (DSFMT) and partial matched filter-all phase fast Fourier transform (PMF-apFFT) is proposed. Firstly, the algorithm estimates the modulation frequency of SFM interference through FFT, and carries out DSFMT based on the estimation of modulation frequency. Then remove interference components from DSFMT domain and do inverse DSFMT (IDSFMT) to realize interference suppression. Finally, the PMF-apFFT method is used to realize the precise capture of the BOC signal after interference suppression. Theoretical analysis and simulation results show that the proposed algorithm greatly simplifies the computational complexity of traditional DSFMT without affecting its performance, and under the same condition, when the detection probability is 1, the performance of the proposed algorithm is about 3 dB higher than that of DSFMT combined with PMF-FFT.

Key words: sinusoidal frequency modulation (SFM) interference, discrete sinusoidal frequency modulation transform (DSFMT), all phase fast Fourier transform (apFFT), binary offset carrier (BOC)

CLC Number:

TN911.7

Jiaxin FENG, Tianqi ZHANG, Yi PAN, Wei XU. Precise acquisition of BOC in sinusoidal frequency modulation interference[J]. Systems Engineering and Electronics, 2020, 42(11): 2620-2628.

Figures/Tables 13

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References 30

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算法	f_m搜索长度	l搜索长度	计算复杂度	FFT
DSFMT	M₁	M₂	O(M₁M₂N)	-
改进DSFMT	M₃	M₂	O(M₃M₂N)	3N/2(log₂N)

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Precise acquisition of BOC in sinusoidal frequency modulation interference

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