基于变频转发RDSS信号模拟的参数生成算法

近年来,有源与无源体制兼容型的RDSS接收机技术的迅速发展对与之匹配的高精度卫星信号模拟器的研制提出了迫切需求.模拟器主要包含卫星轨道仿真、用户轨迹仿真、误差建模、信号生成参数计算等模块.其中信号生成参数的模拟是需要解决的一项关键技术.但由于RDSS卫星导航系统的信号播发具有变频转发的特点,使得信号参数的模拟变得比GPS等直播式系统复杂.为此,提出了一种适合变频转发的卫星信号生成参数算法,并推导了多普勒频移参数计算公式.仿真实验结果验证了文中算法的正确性.

Signal parameter production algorithm based on frequency conversion and transmitting

As the technology of the dual-mode RDSS receiver with passive and active positioning function has been developing rapidly nowadays,the high precision simulator is strongly demanded.The simulator comprises the satellite orbit module,the target trajectory calculation module,the error calculation module,and the like.The production of signal parameters has been a crucial technique that must be solved for the RDSS signal simulator.However,compared with GPS system,RDSS satellite system is a transmitting system with transponder and frequency conversion,which gives rise to more complexity in RDSS signal parameter production.Therefore,for the transmitting satellite system,signal parameter production algorithm was proposed;the formulae for the Doppler frequency shift were derived for the first time.Simulated experiments were carried out,and the results verified the validity of the algorithm.