基于天文开源软件的卫星干涉测量数据处理系统

VLBI (Very Long Baseline Interferometry)技术观测卫星需要对干涉测量数据进行相关和后处理,通过相关、时延校准、条纹搜索,最终得到卫星的基线几何时延.基于天文开源软件建立起一套卫星干涉测量数据处理系统.该系统可工作在实时和事后两种状态,实现相关、中性大气、电离层、钟模型以及仪器硬件的时延校准、条纹搜索、生成基线时延和时延率序列.使用该系统处理北斗GEO (Geosynchronous Earth Orbit)卫星的干涉测量试验数据,得到了精度在1–2 ns量级的卫星基线时延序列.

Satellite Interferometric Data Processing System Based on Astronomy Open Source Software

For VLBI (Very Long Baseline Interferometry) satellite tracking, the raw observational data should be processed by cross correlation and post-correlated data processing. Through correlation, delay calibration and fringe search, the satellite''s baseline geometric delays are finally calculated. Here, a software package used for satellite interferometric data processing was developed based on several open source astronomical software packages. The system can work in both real-time and post-event modes to perform cross correlation, atmospheric delay, ionospheric delay, clock-model, and instrumental delay calibrations, fringe search, and generate baseline delay and delay rate sequences. Satellite baseline delay sequences with an accuracy of 1--2ns was successfully obtained by using this system to process the interferometric data of Beidou GEO (Geosynchronous Earth Orbit) satellites.