基于优化CCSK调制的低轨卫星通信导航一体化信号设计方法

doi:10.11959/j.issn.1000-0801.2024158

Abstract

Abstract:

A signal design method was proposed for communication and navigation integration,utilizing optimized cyclic code shift keying (CCSK) as communication spread spectrum modulation. The positive value of the cross-correlation function of the communication signal aligns with the peak value of the autocorrelation function of the navigation signal to overcome the cross-correlation interference and enhence the communication rate. The frequency bands of communication signal and navigation signal were divided by frequency division multiplexing. Based on orthogonal frequency division multiplexing (OFDM), three sub-carrier distribution schemes of continuous allocation, alternating allocation and random allocation were proposed. Simulation and analysis of the autocorrelation peak performance of integrated signal with optimized CCSK and CCSK modulation were conducted. The results demonstrate that under three subcarrier allocation schemes, the autocorrelation peak performance of the integrated signal employing optimized CCSK modulation surpasses that using only CCSK modulation. And the cross-correlation characteristic of communication signal modulated by optimized CCSK will enhance the autocorrelation peak value of the corresponding navigation signal, and improve the code phase synchronization performance of navigation signal under the integrated signal system.

Key words: communication and navigation integration, orthogonal frequency division multiplexing, cyclic code shift keying, signal design

CLC Number:

TN927

Min ZHU, Yafei ZHAO, Yuman ZHANG, Mugen PENG. A signal design method for LEO satellite communication and navigation integration based on optimized CCSK modulation[J]. Telecommunications Science, 2024, 40(6): 69-78.

Figures/Tables 15

8 bit扩频序列	3 bit数据
$c 1 c 2 c 3 c 4 c 5 c 6 c 7 c 8$	000
$c 2 c 3 c 4 c 5 c 6 c 7 c 8 c 1$	001
$c 3 c 4 c 5 c 6 c 7 c 8 c 1 c 2$	011
$c 4 c 5 c 6 c 7 c 8 c 1 c 2 c 3$	010
$c 5 c 6 c 7 c 8 c 1 c 2 c 3 c 4$	100
$c 6 c 7 c 8 c 1 c 2 c 3 c 4 c 5$	101
$c 7 c 8 c 1 c 2 c 3 c 4 c 5 c 6$	110
$c 8 c 1 c 2 c 3 c 4 c 5 c 6 c 7$	111

References 18

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方法		偏移量
方法		2 046	4 092	6 138
优化CCSK	导航自相关	0.887 6	1	0.887 6
	通导互相关	0.038 1	0.068 9	0.029 8
	通导融合信号峰值	0.925 7	1.068 9	0.917 4
CCSK	导航自相关	0.902 2	1	0.902 2
	通导互相关	-0.004 4	0.003 4	0.011 7
	通导融合信号峰值	0.906 6	1.003 4	0.913 9

方法		偏移量
方法		2 046	4 092	6 138
优化CCSK	导航自相关	0.941 3	1	0.941 3
	通导互相关	0.047 9	0.082 1	0.032 3
	通导融合信号峰值	0.989 2	1.082 1	0.973 6
CCSK	导航自相关	0.476 1	1	0.476 1
	通导互相关	-0.015 6	-0.008 8	-0.009 8
	通导融合信号峰值	0.460 5	0.991 2	0.466 3

方法		偏移量
方法		2 046	4 092	6 138
优化CCSK	导航自相关	0.942 3	1	0.942 3
	通导互相关	0.032 3	0.071 8	0.034 7
	通导融合信号峰值	0.974 6	1.071 8	0.977
CCSK	导航自相关	0.489 7	1	0.489 7
	通导互相关	-0.010 3	-0.030 8	-0.013 7
	通导融合信号峰值	0.479 4	0.969 2	0.476 0

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A signal design method for LEO satellite communication and navigation integration based on optimized CCSK modulation

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