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- 2016
基于Chapman函数的电离层TEC同化模型构建
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Abstract:
电离层总电子含量TEC (total electron content)是影响卫星导航定位的主要误差源之一。为了构建精确的电离层TEC模型,基于Chapman函数建立了基于物理机制的电离层TEC同化模型背景场,并着重以IGS发布的2008年4个时段低纬度、中纬度和高纬度地区的电离层TEC数据为样本,同化稀疏点上的已知电离层TEC值,分析模型计算值的残差和相对精度分布,利用模型对电离层TEC进行了2 h短期预报和1 d预报,并将1 d的预报值和IGS发布值进行对比。实验结果表明:(1)由同化模型计算得到的TEC残差值超过92%分布在±2 TECU以内,并且除边缘区域外,同化模型TEC计算值的相对精度均在90%以上;(2)2 h和1 d预报残差小于±3 TECU的比例分别为81.8%和81.5%
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