In order to systematically verify the performance of SINS/GPS tightly-coupled system ,based on a GPS software receiver ,and a simulation system is constructed .The sim-ulation system consists of a trajectory generator ,a GPS IF signal simulator ,an IM U signal simulator ,a GPS software receiver ,a SINS navigation solver module ,a Kalman filter ,a navigation performance analysis module and other components .The detailed design of the ac-quisition and tracking algorithm of GPS software receiver ,SINS solution and Kalman filter based on pseudorange and pseudorange rate is provided .The simulation results show that , tightly-coupled integrated navigation system has a better convergence ,can control accumula-ted errors of SINS from a certain extent ,so it has a better navigation performance .And the system can meet the needs of tightly-coupled integrated navigation system performance veri-fication .The simulation platform can also be employed for the following research on ultra-tightly-coupled SINS/GPS .%为了系统验证SINS/GPS紧组合系统的性能，基于GPS软件接收机，进行了仿真系统构建。仿真系统由轨迹发生器、G PS 中频信号模拟器、IM U 信号模拟器、G PS软件接收机、SINS导航解算模块、组合滤波算法和导航性能分析模块等部分构成，其中详细设计了GPS软件接收机中的捕获和跟踪算法、SINS解算以及基于伪距和伪距率的组合滤波算法。仿真结果表明：紧组合导航系统收敛性较好，能够一定程度上抑制惯导系统误差的积累，有较好的导航性能。设计的该系统满足紧组合导航系统性能验证的需要，也为后续的超紧组合研究奠定了良好的基础。
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