刘永桦;王鹏毅;王西夺;

• 1:中国电子科技集团公司第五十四研究所

摘要(Abstract)：

为了改善低信噪比卫星下行短突发扩频信号载波跟踪时,解调性能随着信号动态增大而明显恶化的现象,提出了一种多普勒动态补偿辅助的载波跟踪算法,首先通过短时傅里叶变换(STFT)结合最小二乘拟合(LSM)算法估计信号频率及变化率,再利用估计值对原始信号进行多普勒动态补偿,最后使用三阶锁相环完成载波精确跟踪,对算法进行优化设计并进行仿真,以提高数据利用率。仿真结果表明,在接收-170 dBW灵敏度电平条件下,优化后的算法在对捕获后频偏小于200 Hz,频率变化率小于2 kHz/s的信号进行跟踪时,跟踪成功率达到99%,解调损失小于0.2 dB。新算法复杂度适中,利于工程实现,为现有接收机载波跟踪模块对低信噪比突发扩频信号进行改进提供了参考。

关键词(KeyWords)： 无线通信技术;短突发扩频信号;载波跟踪技术;短时傅里叶变换;多普勒动态补偿

Abstract:

Keywords:

基金项目(Foundation): 中国电子科技集团公司航天信息应用技术重点实验室基金(SXX19629X060)

作者(Author): 刘永桦;王鹏毅;王西夺;

Email:

DOI:

参考文献(References)：

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