In the engineering application, due to the transmission of the satellite signals and navigation computing of satellite navigation system, the output of receiver has produced delay, which will lead to errors of position and velocity badly, especially for high dynamic users. For this, a SINS/GPS Integrated Navigation closely based on curve fitting is presented, which solves the influence of navigation system derive from GPS delay. On this basis, it uses the curve fitting method to guarantee the accuracy of time synchronization. Finally, the improved system is verified by simulation. And the results show that the precision of horizontal position and velocity of the system have been improved markedly, and demonstrate the validity of the approach.%在工程实际应用中,由于GPS、北斗等卫星导航系统的卫星信号传输、导航计算等均需要耗费一定的时间,当用户接收机输出导航信息时已经产生了延时.尤其对于高动态用户,这一输出延时现象将会导致严重的位置误差和速度误差.针对此,提出了基于曲线拟合的SINS/GPS紧密组合导航系统,解决了高动态时GPS延时问题对导航系统的影响,从而通过曲线拟合的方法保证了时间同步的精度.最后对改进后的系统进行了仿真验证,结果表明该系统的水平位置精度、速度精度均得到显著提高,验证了该方法的有效性.
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