飞机载体的杆臂效应对GPS测速精度的影响

The Aircraft's Lever Arm Effect Impact on the Accuracy of GPS Speed

杆臂效应是由于测量体的安装位置与运动载体质心不重合而引起的。从理论上分析了杆臂效应产生的原理,推导得出杆臂效应引起的速度误差公式。通过仿真试验和飞行试验数据分析了飞机载体不同运动状态下,杆臂效应对GPS速度测量精度的影响。通过对杆臂误差补偿后,GPS测速精度得到很大提高。在惯导系统飞行试验中引入该方法,可以科学合理地给出系统试飞评定结果。

Lever-arm effect is caused by the noncoincide of the measuring body＇s mounting position and the center of mass of the moving body. This paper theoretically analyzes the principle of the lever arm effect, deduced speed error formula produced by lever arm effects. The simulation re- sults and the flight test data are both analyzed how the impact of the lever arm effect on the meas- urement accuracy of GPS speed, while the aircraft on different movements. Through error com- pensation, GPS speed measurement accuracy is greatly improved. This compensation method can be used to inertial navigation systems and related subiects＇ flight test.