基于GPS-惯性数据的激光大气数据系统标定方法

Calibration method for optical air data system based on GPS-inertial integrated navigation data

激光大气数据系统由于系统测量精度较高以及测量区域范围较大,目前尚无有效的高精度标定手段。针对这一问题,提出一种直线折返测速法,可以消除大气中风速的影响,将消除风速影响后的空速数据与GPS-惯性组合导航系统测量的地速数据进行对比分析,以评价激光大气数据系统真空速测量性能。分析了所提方法的各类测量误差以及理论极限精度。飞行实验结果表明,所提方法测量精度优于0.5 m/s,接近理论误差极限,可以用来标定激光大气数据系统,为激光大气数据系统标定技术的发展和应用提供参考。

There is no effective high-precision calibration method for the optical air data system(OADS)due to its high measurement accuracy and the large measurement area range.To solve this problem,a straight-round-trip velocity measurement method is proposed,which can eliminate the influence of wind speed.The true airspeed after removing the wind speed influence are compared with the ground velocity measured by GPS-Inertial integrated navigation system(INS),so as to evaluate the true airspeed measurement performance of OADS.The measurement errors and theoretical limit precision of the proposed method are analyzed.The flight experimental results show that the measurement accuracy of the proposed method is better than 0.5 m/s,approaching the theoretical error limit,and can be used to calibrate the OADS.The research results can provide useful reference in the development and application of calibration technology for OADS.