基于INS辅助的高动态GPS接收机算法研究

Research on INS aided high dynamic GPS receiver algorithm

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(inertialnavigationsystem)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。

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.