机载对地观测飞行轨迹设计与对比分析

针对机载对地观测载机长时间匀速直线飞行时分布式位置姿态测量系统(POS)姿态误差随时间积累的问题,基于载机有效机动能够提高分布式POS系统可观测度进而提高系统估计精度的思想,设计并对比多种机动方式下分布式POS系统的估计精度,并对机动后分布式POS系统进入测区前的滤波估计稳定时间、直线飞行成像时长和全球定位系统(GPS)基线长度进行了测试。仿真结果表明,设计的飞行轨迹能够提高成像段运动参数的测量精度,可为机载对地观测最优飞行轨迹的选择和设计提供理论指导。

Design and comparative analysis of flight trajectory of airborne earth observation

Aimed at the problem of attitude errors of distributed position and orientation system (POS)accumulate over time when airborne earth observation aircraft moves along a straight line at a constant velocity,a variety of maneuver modes were designed.Not only the estimation accuracy of distributed POS was compared,but also the time of system reaching stability after maneuver and the time of straight flight in imaging segment and baseline length of global position system (GPS) were tested.The method was based on the concept that the effective maneuver can improve the observability of distributed POS.Simulation results show that the designed flight trajectory can improve the measurement accuracy of the imaging segment motion parameters and can provide theoretical guidance for the selection and design of optimal flight trajectory for airborne earth observation.