Abstract
Considering the difficulty of carrier synchronization and the low tracking accuracy in high-dynamic environments, the joint open-loop acquisition and closed-loop tracking carrier synchronization algorithm is presented. Firstly, the algorithm derives the coarse estimation of Doppler frequency and Doppler rate via open-loop acquisition, then the residual Doppler frequency and Doppler rate are confined into a small range. Secondly, the residual Doppler rate is tracked by using a third-order phase-locked loop(PLL). The present algorithm has the advantages of fast acquisition and high tracking accuracy. Finally, the numerical simulation is conducted to verify the present synchronization algorithm. The simulation results indicate that at the signal to noise ratio(SNR) of and normalized Doppler frequency and Doppler rate ranging from to, the bit-error-rate(BER) performance degradation is as low as comparing with theoretical value.
Highlights
the algorithm derives the coarse estimation of Doppler frequency
Doppler rate are confined into a small range
the re⁃ sidual Doppler rate is tracked by using a third⁃order phase⁃locked loop
Summary
西北工业大学学报 Journal of Northwestern Polytechnical University https: / / doi.org / 10.1051 / jnwpu / 20183661232 Æ1.中国电子科技集团公司 第二十研究所, 陕西 西安 710068; 2.西安邮电大学, 陕西 西安 710100;ö ç è3.西安电子科技大学, 陕西 西安 710071 ø 摘 要:针对高动态环境下载波同步困难和跟踪精度低的问题,提出联合开环捕获与闭环跟踪的高动 态载波同步算法。 首先,该算法通过开环捕获得到多普勒频率偏移及多普勒变化率偏移的粗估计,将 剩余多普勒频率偏移和变化率偏移控制在一个较小的范围内。 其次,在载波跟踪阶段采用三阶锁相 环(PLL)对剩余多普勒频率偏移和变化率偏移进行跟踪。 提出的算法同时具有快速捕获与精确跟踪 的良好特性。 最后,通过 Matlab 仿真对同步算法进行验证。 仿真结果表明,当信噪比为 8 dB,归一化 多普勒频率偏移和多普勒变化率偏移分别在( -0.25,0.25)和( -10-4,10-4 )范围内时,该算法的误码率 相比理论值仅损失 0.7 dB。
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