卫星精密测定轨中的对流层延迟估算系统

基于V isual Basic编程,设计了卫星精密测定轨中的实时气象采集与对流层延迟估算系统。利用实时采集ZQZ-A型自动气象站的温度、相对湿度、大气压等气象要素,采用Saastamoinen模型进行估算天顶方向对流层静力延迟和湿延迟,同时采用地基双波段微波辐射计测量大气水汽总量和云液态水总量,进而估算更高精度的湿延迟,在其有效时与模型计算的静力延迟相加,得到天顶方向总延迟;无效时采用模型计算的总延迟。最后将其投影到卫星方向得到总延迟。实际应用表明,设计的对流层延迟估算系统人机界面友好,具有易用性,能实时、稳定地为卫星精密测定轨提供服务。

A Tropospheric Delay Estimate System for Satellite Orbit Determination

Based on Visual Basic program,a tropospheric delay estimate system for satellite orbit determination is designed. The system can collect temperature,relative humidity and atmosphere pressure from ZQZ-A model weather station,and estimate zenith tropospheric delay by Saastamoinen model, meanwhile, It can remote sense atmospheric integrated water vapor and cloud liquid water by two-channel microwave radiometer to estimate precise wet delay, if the wet delay is valid then add hydrostatic delay to estimate total delay, otherwise use wet delay by model. Finally, it can project the delay on each satellite direction to estimate slant total delay. The practice indicates that the tropospheric delay estimate system proposed is friendly in human-computer interface. It is easy to use and can serve satellite orbit determination steadily.