Real-time Monitoring of Ionosphere Changes in the Shanghai Region by GPS Technology
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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3 TECU.Abstract: 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 3TECU.
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