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在现有的高动态微弱信号的载波跟踪算法中,针对锁频环(FLL)辅助锁相环(PLL)载波跟踪算法,环路调整不连续,易出现跟踪失锁的问题,给出了FLL与PLL的更优组合算法,并确定了组合环路状态转换的过程以及环路状态转换的门限值,从而优化环路性能;针对带宽调整不准确影响环路跟踪性能的问题,分析得出最优带宽值,确定了试探法带宽调整策略,对环路带宽进行实时调整,最终在信噪比为3 d B,且存在加加速度分量时,环路的跟踪误差达到3 Hz左右.
In the existing carrier tracking algorithm of high dynamic weak signal, aiming at FLL auxiliary carrier phase tracking (PLL) carrier tracking algorithm, the loop adjustment is discontinuous and the problem of tracking loss of lock easily occurs. The FLL And the optimal combination of PLL algorithm and determine the combination of loop state transition process and the threshold value of the loop state transition in order to optimize the loop performance; for bandwidth adjustment is not accurate impact on the loop tracking performance analysis obtained Optimal bandwidth, the heuristic bandwidth adjustment strategy is determined and the loop bandwidth is adjusted in real time. Finally, the tracking error of the loop reaches about 3 Hz when the signal to noise ratio is 3 d B and the jerk component exists.