CHAMP加速仪资料的快速校标研究  

A Rapid and Effective Calibration Method for CHAMP Accelerometer

作　　者：熊永清[1,2] 汪宏波[1,2] 赵长印[1,2] 许晓丽[1,3] 

机构地区：[1]中国科学院紫金山天文台,南京210008 [2]中国科学院空间目标与碎片观测重点实验室,南京210008 [3]中国科学院研究生院,北京100049

出　　处：《天文学进展》2011年第2期228-237,共10页Progress In Astronomy

基　　金：国家自然科学基金(10773033)

摘　　要：对星载加速仪进行校标是有效利用星载加速仪测量数据的基础,目前校标方法都是建立在星载GPS资料处理的基础上,对处理软件和计算设备的要求都非常高。为了满足高层大气阻力研究的需要,提出了一种快速高效的校标方法,即利用GFZ公布的CHAMP卫星快速轨道作为观测资料,采用有尺度因子和线性偏差的加速仪测量值代替非引力模型摄动加速度,采取精密定轨的手段重新进行轨道拟合,在轨道改进的同时,解算每一天加速仪的尺度因子和线性偏差,并通过内部解算和外部符合来说明方法的有效性。这种方法能够提供较高时间分辨率的加速仪参数,对研究大气密度的短期变化具有较好的价值。A rapid and effective calibration method for CHAMP accelerometer is developed in this work,the rapid CHAMP orbits published by GFZ are used as observations,the in-orbit calibrated accelerometer observations are used to replace the non-gravitation,and the calibration parameters,include scales and biases in the xyz direction of instrument fixed system,are estimated in the process of precise orbit determination,and in the meantime of 6 initial orbit elements estimation. To improve the reliability of calibration,outlier eliminating and continuity selection are performed, and all the historical data of CHMP are processed.Basically the CHAMP orbits are retained from the orbit processing residuals,and the average of calibration parameters for first 100 days is very close to the official values.Moreover,the next day＇s orbits is used to show the validity of calibration parameters,the maximum difference in R direction is lower than 1m,and in N and T direction are about 3 m and 10 m respectively,it＇s a satisfied prediction for lower orbit satellite. The method is fast,for a single-day,it just takes no more than 2 minutes in a typical PC,and can give a pair of calibration parameters for every day,so it can help to improve the air drag model,and promote the study of short-term changes in atmosphere.

关 键 词：CHAMP 星载加速仪 校标 

分 类 号：P204[天文地球—测绘科学与技术]