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- 2018
多频多模接收机差分码偏差的精密估计与特性分析
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Abstract:
全球导航卫星系统（Global Navigation Satellite System，GNSS）探测大气电离层需要精确处理由接收机差分码偏差（differential cade bias，DCB）引起的系统误差。准确掌握接收机DCB的多时间尺度精细变化等特性是联合美国GPS、中国北斗卫星导航系统（BeiDou navigation satellite system，BDS）和欧盟Galileo等多GNSS技术监测电离层所面临的主要科学问题之一。为此，提出了基于零基线精密估计站间单差接收机DCB的方法，并对站间单差接收机DCB的日加权平均值进行了分析。基于4台多模接收机采集于2013年的双频观测值，揭示了站间单差接收机DCB的变化可能受3种因素的影响，即接收机内置软件的版本升级（实验中引起了约3 ns的显著增加）、拆卸个别接收机所导致的观测条件改变（实验中引起了约1.3 ns的显著减少）和估计方法的误差（引起了与导航系统卫星几何结构重复性相一致的周期性变化）等
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