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- 2017
一种基于观测方程GDOP值的优化选站模型
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Abstract:
针对GNSS（global navigation satellite system）数据分析中心对快速、超快速轨道产品精度及时效性的要求以及全球跟踪站分布不均匀性的现状，本文提出一种基于观测方程GDOP（geometric dilution of precision）值的优化选站SSS（selected step by step）模型。从理论上推导出精密定轨最小地面跟踪站数与地面最优跟踪站数的计算方法，分别通过s°×s°和k°×k°带全球网格划分，筛选最小跟踪站全球分布，以定轨观测方程GDOP值最小为准则，逐步累加筛选定轨全球跟踪站最优分布。连续6 d的数据分析结果表明，本文提出的优化选站模型，在相同数据处理能力条件下，定轨精度可达整体处理的90%，处理时间缩短50%以上；与一般策略对比表明，SSS模型计算出的轨道精度相当，时间节约20%左右；此模型所选跟踪站为最优或次优，提高了分析中心数据处理效率
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