【摘要】 提出了一种基于四维卡尔曼滤波的自适应锁相环算法,并将该算法用于高动态GPS信号的载波跟踪.详细推导了卡尔曼滤波与数字锁相环之间的等效性,并给出了相应的环路更新步骤.仿真结果表明,该算法相对于采用固定增益数字锁相环的算法明显地降低了载波跟踪过程的均方根频率误差,提高了接收机的测速精度.更多还原

【Abstract】 A four-dimensional Kalman filter based adaptive phase-locked loop(PLL) algorithm is proposed for the carrier tracking of high dynamic GPS signals.The equivalence between Kalman filer and digital phase-locked loop is derived and the corresponding loop update method is proposed.The simulation results show that the RMS frequency error performance is improved obviously compared with the fixed-gain digital phase-locked loop(DPLL) algorithm.更多还原