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提出了一种高动态GPS信号中时变多普勒频率的合成方法.通过对频率合成器中载波NCO输入频率控制字的有效设计来完成对输出信号频率及其一阶和二阶导数的精确控制,从而准确地模拟出卫星和GPS接收机之间在相对很高的运动速度、加速度和加加速度动态条件下,在接收的GPS信号载频上产生的很大的多普勒频移及其一阶和二阶变化率.典型高动态多普勒频率参数的实验合成结果证明了方法的正确性和有效性.
A synthesis method of time-varying Doppler frequency in high dynamic GPS signal is proposed.Through the effective design of the input frequency control word of carrier NCO in the frequency synthesizer, the accuracy of the output signal frequency and its first and second derivatives Control so as to accurately simulate the large Doppler shift occurring on the received GPS signal carrier frequency between the satellite and the GPS receiver at relatively high speeds, accelerations and jerk dynamics First-order and second-order rates of change. Experimental results of typical high-dynamic Doppler frequency parameters demonstrate the correctness and validity of the proposed method.