火箭橇试验分离制导工具误差的有效性分析

Availability analysis of guidance instrument error separation in rocket sled experiment

火箭橇试验能在地面提供逼真的飞行环境,是制导系统可靠性检验与精度鉴定的有效手段,代表了未来制导系统测试的一个发展方向。利用火箭橇试验分离制导工具误差是制导系统精度鉴定的核心内容,对此进行了研究:给出了解析式平台制导系统的火箭橇试验方法;推导了制导工具误差系数分离模型;重点对火箭橇试验分离制导工具误差的有效性与精度进行了分析。结果表明,常规解析平台跟踪发射惯性坐标系的情况下,仅能有效辨识少数工具误差系数,系数辨识的精度很大程度上受制于外测精度;进一步分析表明其成因皆由火箭橇试验特性所致。最后给出了三种改善工具误差分离精度的途径。

With the ability of supporting realistic flight environment on the ground, the rocket sled experiment has become an effective approach for reliability test and precision estimate of guidance system. Guidance instrument error separation is the core of guidance precise estimate by rocket sled. In this paper, the rocket sled experiment method on analytic platform was presented, the guidance instrument error separating model was derived, and the availability and precision of instrument error separation were analyzed especially. The results suggest that when the traditional analytic platform traces the launching inertial coordinate system, only a few instrument error coefficients could be identified, and the precision of the coefficients was strongly affected by the exterior measure precision. By further analysis, it is shown that these problems are caused by the experimental characteristics of rocket sled. Then three approaches were given to improve the precision of coefficient separating.