基于INS辅助的高动态GPS接收机算法研究

摘要

By analyzing the problems encountered by missile-born GPS receiver in the practical applications, INS (inertial navigation system) aided GPS receiver algorithm is presented.First of all, using INS of different properties aided GPS receiver directly, through which the missile-born GPS receiver can still be locked as the Doppler frequency occurrences large changes.And when the INS whose gyro drift error is 0.01°/h aided GPS receiver, the dynamic stress error compared to no aid is reduced more than 90％, improved the tracking performance.Then the INS whose gyro drift error is 25.2°/h is corrected by the tightly coupled, and using the corrected result aided GPS receiver, the dynamic stress error compared to no correction is reduced more than 20％.The computer simulations demonstrate that the method can remain the loop bandwidth small enough in the high dynamic environment, satisfying the dynamic performance of the receiver, and also guaranteeing the noise performance.%通过对弹载GPS接收机在实际应用中遇到问题的分析,提出了INS(inertial navigation system)辅助GPS接收机的算法.采用不同性能的INS直接辅助GPS接收机,可以使弹载GPS接收机在多普勒频率发生较大变化时仍然保持锁定,而且陀螺漂移误差为0.01°/h的INS辅助GPS接收机后的动态应力误差比未辅助时减小了90%以上,提高了跟踪性能.对陀螺漂移误差为25.2°/h的INS进行紧耦合校正,并用校正后的结果辅助GPS接收机,动态应力误差比未校正前减小了20%以上.仿真结果表明,该算法在高动态环境下仍然可以使环路带宽足够小,在满足接收机动态性能的情况下,也保证了噪声性能.