GPS/SINS组合系统因其多方面的优越性而在许多导航系统中使用。不过 ,利用GPS接收机的伪距、伪距率和载波相位双差等所有原始观测信息的全组合系统还处于研究之中。针对全组合系统进行了研究 ,建立了相应的误差模型和系统观测模型 ,特别是组合系统下的GPS载波相位双差观测模型。并以高分辨率SAR小卫星的轨道和姿态确定为仿真对象 ,对该系统进行了计算机仿真。仿真结果表明 ,GPS/SINS全组合系统具有很高的精度和可靠性 ,基本上能满足SAR卫星平台的任务要求 The GPS / SINS complex is used in many navigation systems for its many advantages. However, the use of GPS receiver pseudorange, pseudorange and carrier phase double difference and so on all the original observation of the information system is still under study. The whole system is studied and the corresponding error model and system observation model are established, especially the GPS carrier phase double-difference observation model under combined system. The orbit and attitude of high-resolution SAR satellites were determined as the simulation object, and the system was simulated by computer. The simulation results show that the GPS / SINS complete system has high accuracy and reliability and can basically meet the requirements of the SAR satellite platform