实时干涉测量中对流层延迟与钟差精修正建模  

Correction Modeling of Tropospheric Delay and Clock Error in Real-time Interferometry

作　　者：任天鹏[1,2] 唐歌实[1,2] 曹建峰[1,2] 陈略[1,2] 韩松涛[1,2] 王美[1,2] 李黎[1,2] 

机构地区：[1]北京航天飞行控制中心,北京100094 [2]航天飞行动力学技术重点实验室,北京100094

出　　处：《载人航天》2016年第4期483-487,493,共6页Manned Spaceflight

基　　金：国家自然科学基金(61302016;11403001)

摘　　要：由于中国深空干涉测量系统无法采用短时差分标校,使得实时测量精度较差,误差来源主要包括对流层延迟模型误差和钟差模型误差。为了提高实时测量精度,基于最大值最小准则,对对流层天顶延迟进行精确修正;引入邻近估计与线性回归模型,实现了高精度的钟差非线性预报。经任务数据验证,对流层延迟精修正模型预报值与实测值的差异最大值优于0.33m(仰角≥10°);相对EGNOS和"EGNOS+GMF"模型,该误差减小约1个数量级;相对线性预报,非线性预报误差减小约半个数量级。可为我国后续深空探测任务提供高精度对流层延迟和钟差建模及预报。Due to the lack of short-time differential calibration in the deep-space interferometry system of China,the accuracy of real-time measurement is not good. The error mainly comes from the tropospheric delay model error and the clock model error. To improve the accuracy of the real-time interferometry,the tropospheric zenith delay was accurately corrected based on the min-max principle. Using the neighborhood estimation and the linear regression model,a high-accuracy nonlinear prediction on clock error was realized. The difference between the correction model and the measured data of the tropospheric delay was less than 0. 33 m（ elevation ≥ = 10°）,which was better than the EGNOS and EGNOS ＋ GMF models for about 1 order of magnitude. While the difference between the nonlinear prediction model and the measured data of the clock error was better than the linear prediction model for about half order of magnitude. The proposed correction models can be applied to the future deep- space explorations of China.

关 键 词：干涉测量 误差修正 对流层延迟 钟差 精修正建模 

分 类 号：TN911[电子电信—通信与信息系统]