伞舱系统跟踪引导数据迭代算法

针对在返回舱乘伞下降阶段,测控链中弹道测量设备丢失目标,以及跟踪结束后无法外推生成可靠引导数据,光学设备难以快速捕获目标等问题,以风场修正模型为基础,通过风场提前修正与采用测量数据实际修正相结合的方法,建立伞舱系统跟踪引导数据迭代算法.利用多次返回段任务数据对该算法进行实验验证,并与实际任务中目前使用的方法进行比较,结果表明：通过该算法推算较长时间后的引导数据,其平均误差为现有方法的6％;推算较短时间后的引导数据,其平均误差为现有方法的20％.因此,利用该算法计算的引导数据精度较高,有助于光学设备及其他测控设备快速捕获或重捕目标.

Iterative Algorithm for Computation of Tracking Guidance Data of a Parachute-Module System

It is hardly possible for optical equipment to quickly acquire the return module of a spaceship in its para- chuted descent stage if trajectory measurement equipment of the ground tracking system loses its target and no relia- ble guidance data is extrapolated after conclusion of tracking. To solve the problem, an iterative algorithm is presen- ted for computing guidance data for tracking of the parachute-module system based on a wind field correction model by combining advance wind field correction and actual correction with measurement data. Tests and verification with reentry phase mission data and comparison with the method used in real missions show that the mean error with the new algorithm is 6% of the current method when it is used for computing long durations of guidance data. The mean error with the new algorithm is 20 % of the current method when it is used for computing short durations of guidance data. High accuracy guidance data computed with the algorithm helps optical equipment and other tracking equip- ment quickly acquire or re-acquire targets.