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多参考站GPS网提取精密大气延迟
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Journal Article
多参考站GPS网提取精密大气延迟
2012
Overview
多参考站GPS网提取的大气延迟可服务于天气预报、精密定位等领域，但相关的提取方法存在缺陷，如已知信息利用不充分、大气延迟模型化误差较大等，影响提取结果的可靠性。从改进的GPS网平差策略入手，导出一种新的提取方法，其主要特点包括：①直接处理非差GPS观测值，并采用重新参数化方案消除观测方程中的列秩亏；②发掘各参考站坐标已知、整数双差模糊度等条件；③估计斜向的电离层延迟，且采用常速度过程模型化其时间变化特性。试验表明，新方法提取的大气延迟可实现优于1om的短期预报精度。
