高动态环境下数据链信号载波频率估计算法

doi:10.12305/j.issn.1001-506X.2023.09.37

摘要/Abstract

摘要：

针对高动态环境下Link16数据链信号载波同步问题, 设计了一种基于相邻符号相位差与两步式频率估计相结合的多普勒频率估计算法。该算法引入一种导频插入式数据结构, 然后在此基础上对接收信号进行取辐角处理, 再借助相邻符号位的相位差去除一阶频率偏移量, 最后对观测序列求和得到变化率估计值。一阶多普勒频偏估计采用快速傅里叶变换与自相关结合方式来完成。理论分析和仿真结果表明, 所提算法在频偏估计算法的基础上消除了多普勒变化率的影响, 能实现多普勒变化率的有效估计。与其他算法相比, 所提算法进一步增强了数据链系统传输的可靠性与动态环境适应能力, 并且在估计精度方面具有优越的性能。

关键词: 高动态, Link16数据链, 相邻符号相位差, 频偏估计, 多普勒变化率估计

Abstract:

Aiming at the carrier synchronization problem of Link16 data link signal in high dynamic environment, a Doppler frequency estimation algorithm based on the combination of adjacent symbol phase difference and two-step frequency estimation is designed. The algorithm introduces a pilot-inserted data structure, and then takes the spoke of the received signal on this basis, removes the first-order frequency offset with the help of the phase difference of the adjacent symbol bits, and finally sums the observation sequence to obtain the estimated value of the rate of change. The first order Doppler frequency offset estimation is completed by combining fast Fourier transform and autocorrelation. Theoretical analysis and simulation results show that the proposed algorithm eliminates the influence of Doppler rate of change on the basis of frequency offset estimation algorithm, and can achieve effective estimation of Doppler rate of change. Compared with other algorithms, the proposed algorithm further enhances the reliability of data link system transmission and the adaptability to dynamic environment, and has excellent performance in estimation accuracy.

Key words: high dynamic acquisition, Link16 data link, adjacent symbol phase difference, frequency offset estimation, Doppler change rate estimation

中图分类号:

TN919.3

赵晋毅, 尚佳栋, 杨健. 高动态环境下数据链信号载波频率估计算法[J]. 系统工程与电子技术, 2023, 45(9): 2965-2970.

Jinyi ZHAO, Jiadong SHANG, Jian YANG. Carrier frequency estimation algorithm of data link signal in high dynamic environment[J]. Systems Engineering and Electronics, 2023, 45(9): 2965-2970.

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变量	参数
信道模型	AWGN
调制方式	MSK
观测序列长度	1 024
符号周期/μs	0.2
最大多普勒频偏/kHz	25
最大多普勒变化率/(kHz/s)	6

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