摘要
鉴于低信噪比高动态环境下的载波跟踪过程中,接收信号存在显著的各阶频偏变化率,故提出了一种基于卡尔曼和扩展卡尔曼滤波的耦合载波跟踪方法。载波跟踪通过基于卡尔曼滤波的锁频环辅助基于扩展卡尔曼滤波的锁相环来实现,对频率斜升信号和频率加速信号分别进行了载波跟踪环路结构的分析,得到系统方程,并进行了载波跟踪系统性能仿真。经仿真验证,在信噪比为-20 dB条件下,该方法跟踪频率斜升信号收敛时间小于60 ms,跟踪频率加速信号收敛时间小于90 ms,对两种信号的频率跟踪残差均小于5 Hz,相位跟踪残差均小于0.25rad,跟踪性能显著优于传统环路。
Considering the significant variation rates of different order frequency offsets in carrier tracking under low signal-to-noise ratio(SNR)and high dynamic conditions,a coupled carrier tracking method based on Kalman and extended Kalman Filtering is proposed.Carrier tracking is achieved by assisting a phase-locked loop based on extended Kalman Filtering with a frequency-locked loop based on Kalman Filtering.The structure of the carrier tracking loop for frequency ramp and frequency acceleration signals is analyzed,resulting in system equations,followed by a simulation of the carrier tracking system performance.The simulations validate that under a-20 dB SNR condition,the proposed method converges in less than 60 ms for frequency ramp signals and less than 90 ms for frequency acceleration signals.The frequency tracking residuals for both signal types are less than 5 Hz,and the phase tracking residuals are less than 0.25 radians,significantly outperforming traditional loop tracking methods.
作者
付学瀚
燕贺云
朱立东
蒯小燕
郭孟泽
FU Xuehan;YAN Heyun;ZHU Lidong;KUAI Xiaoyan;GUO Mengze(National Key Laboratory of Wireless Communications of UESTC,Chengdu 611731,China)
出处
《移动通信》
2024年第1期118-124,共7页
Mobile Communications
基金
重点实验室基金项目“抗干扰波形及接收方法研究”(6142102222102)
全国重点实验室基础科研创新基金项目资助“受扰低轨卫星网络的时空关系认知和任务综合保障机制研究通信抗干扰”(IFN20230203)
国家自然科学基金“卫星通信弹性抗干扰传输理论与方法研究”(62371098)。
关键词
高动态载波跟踪
低信噪比
卡尔曼滤波
扩展卡尔曼滤波
high dynamic carrier tracking
low signal-to-noise ratio
Kalman Filter
extended Kalman Filter
