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研究了中频模拟器中时变系统采样间隔的高动态多普勒频移模拟方法.基于卫星运动模型研究了信号高动态频移特性,提出基于变频率动态采样的伪码和载波多普勒频率偏移模拟方法;给出高精度码多普勒频移模拟设计方案,通过省略传统方法中必需的码数控振荡器模块来降低系统实现的硬件复杂度;通过对伪码频率模拟误差精度的分析,推导了算法主要参数取值的闭式解.仿真结果表明,在接收信号频率具有有限二阶变化率的高动态环境下,该方法可有效提升多普勒频移模拟精度,并给出具有高稳定度的结果.
The high dynamic Doppler frequency shift simulation method of time varying system sampling interval in IF simulator is studied.The high dynamic frequency shift characteristics of signal are studied based on satellite motion model.The pseudo code based on variable frequency dynamic sampling and carrier Doppler frequency Offset simulation method is proposed. The simulation design scheme of Doppler shift of high precision code is given. The hardware complexity of the system is reduced by omitting the necessary code-controlled oscillator module in the traditional method. By analyzing the accuracy of pseudo-code frequency simulation error , The closed-form solution of the main parameters of the algorithm is deduced.The simulation results show that this method can effectively improve the accuracy of Doppler shift simulation in the high-dynamic environment with limited second-order rate of change of received signal frequency, High stability results.