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相对于传统的固定载波频率信号的测控体制,使用跳频扩频信号进行测速在提高了测控系统抗干扰能力的同时带来了信号跟踪精度不高的问题。针对这一问题,文章提出一种使用卡尔曼滤波器替换传统锁频环路低通滤波器的环路结构,推导了卡尔曼滤波器跟踪算法的递推公式。仿真结果表明,经过改进之后的环路跟踪精度大大提高,系统的测速精度达到15cm/s,比未使用卡尔曼滤波时候的测速精度提高了约6倍。
Compared with the traditional measurement and control system of fixed carrier frequency signal, the use of frequency-hopping spread-spectrum signal for speed measurement has raised the anti-interference ability of the measurement and control system and brought the problem of low signal tracking accuracy. To solve this problem, this paper presents a loop structure using Kalman filter to replace the traditional low-pass filter with frequency-locked loop. The recursion formula of Kalman filter tracking algorithm is deduced. The simulation results show that the improved loop tracking accuracy is greatly improved, the system’s speed accuracy reaches 15cm / s, which is about 6 times higher than that without Kalman filter.