利用GPS技术实时监测上海区域电离层变化

摘要

基于GPS技术实时监测电离层变化原理，利用载波平滑伪距观测值建立区域电离层模型的方法，计算了电离层延迟量和硬件延迟，根据硬件延迟值相对稳定的特点，采取一定时段求解出硬件延迟量，对实时硬件延迟量进行预报，进而实时分离GPS信号传播路径上的垂直总电子含量VTEC．利用上海区域内的GPS网的观测数据，建立实时上海区域电离层延迟模型，监测上海区域的电离层变化．数据分析结果表明，这种方法的内符合精度优于3TECU．%A method of real-time monitoring ionosphere based on GPS technology is described in this paper. The regional ionosphere model is constructed using GPS phase-smoothed pseudorange measurements. The ionosphere delay and instrumental bias are also calculated. Because the instrumental bias is stable, its value can be obtained after a period of time. Using this value, realtime instrumental bias can be forecasted. After deducted the instrumental bias from GPS signal, the real-time ionosphere information can be extracted in path of signal propagation. To validate this method, the data of Shanghai regional GPS network are used and a real-time regional ionosphere model is created. The results show the internal precision of this regional ionosphere model are better than 3 TECU.