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- 2018
多GNSS系统精密定轨ISB/IFB估计及特性分析
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Abstract:
多全球导航卫星系统（Global Navigation Satellite System，GNSS）系统联合精密定轨需要考虑系统间及频率间偏差的影响。推导了多GNSS定轨系统间偏差（inter system bias，ISB）/频率间偏差（inter frequency bias，IFB）解算模型，以GPS系统硬件延迟为基准，给出了一种消除ISB/IFB秩亏的约束方法。试验数据结果表明，各系统ISB/IFB均表现出良好的稳定性及同一系统各卫星时间序列的一致性，BDS ISB的标准差为0.36 ns，Galileo ISB的标准差为0.18 ns，GLONASS IFB的标准差为0.51 ns；在接收机类型相同的情况下，不同跟踪站的ISB比较接近，但仍可达到ns级差异；GLONASS IFB在同一跟踪站相同频道号的卫星及不同跟踪站相同频道号卫星均表现出了良好的一致性
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