一种航天器安装精测数据修正与处理方法

A Method for Spacecraft Alignment Data Fixing and Processing

针对航天测绘等高性能遥感对精测数据的高要求,提出一种高精度精测数据修正与处理方法。分析发现单精度浮点数可给精测数据引入很大误差,为此一方面采用更高精度的双精度型浮点数减少存储截断误差,另方面设计了精测数据误差修正算法对原始数据误差进行修正;采用多叉树数据结构对精测数据与精测关系同时进行记录,并基于该数据结构提出了可进行多阶段精测数据复合分析、多设备间相对安装指向分析和设备安装精度分析等操作的统一处理方法;该方法已用于资源三号卫星等型号,实现了遥感卫星精测数据的高精度处理与一站式操作,规范了数据处理方法与流程。

According to the specific requirements on alignment data of high pertormance spacecrmt such as space survey, a method for alignment data fixing and processing with high precision is proposed. It is found that if single-precision floating point used, serious precision loss may be produced by data trunca- tion, and to overcome that, double-precision floating point is used to reduce data truncation, and an algo- rithms is also developed to fix errors existing in original measurement data. Both alignment data value and relation are recorded in the multiple tree data structure, and an unified processing algorithms is proposed to conduct operations such as multi-phases alignment data synthesis, relative alignment analysis of differ- ent equipments and equipment alignment error analysis. The alignment data fix and process algorithms is developed and used in ZY-3 satellite, and alignment data is processed with high precision in an unified mode, and both process methods and flow are regulated.