双IMU/DGPS组合相对测姿系统应用于动态载体上两点之间的相对姿态测量,该系统使用DGPS的速度和位置信息分别与主惯导系统和从惯导系统的导航信息进行组合,并解算两惯导系统的相对姿态。针对组合测姿系统对于同步的要求,提出了以惯导系统内石英晶体振荡器作为时间基准的数据同步方法,并进行了半实物仿真试验。试验结果表明,该同步方法可使双惯导系统间的数据同步误差从10ms减至100ns以下。同步精度满足要求,并具有很高的可靠性。

Double IMU/DGPS integrated attitude measurement system is used for measuring the relative attitude of two points on a moving carrier. The system integrates the velocity and position information of DGPS with the navigation information of the master INS and the slave INS respectively, and the relative attitude can be calculated. In order to realize the synchronization of DGPS and INS as well as the two INS, the method adopting quartz oscillator in INS as the time reference was proposed. The hardware-in-the-loop simulation results show that the synchronization error of the INS decreases from 10ms down to 100ns by the proposed method. The synchronization precision meets the requirement and the method has high reliability.