GPS二次差数据分析

ANALYSES OF GPS DOUBLE DIFFERENCE DATA

根据在加拿大国家研究院(NRC),美国国家标准局(NBS)和美国海军天文台(USNO)之间通过不同GPS卫星和不同跟踪时间的共视测量数据,计算和分析了"一般二次差"和"时刻间二次差"观测量.借助于一些有意义的结果,人们可以加深对GPS各项误差源的认识.本文提出了利用单通道接收机得到"卫星间二次差"的"伪同步"方法,并建议了一种把两台站间所有时间比对共视测量数据结合在一起的无偏差权平均计算方法.

Based on the common view measurement data via different GPS satellite and different tracking time among the National Research Council (NRC), Canada, the National Bureau of Standards (NBS), USA and the U.S.Naval Observatory (USNO), USA, the 'general double difference' and 'double difference with time' observables have been calculated and analysed. With some significant results, one could get an insight into various GPS error source. Using the proposed 'pseudo synchronism' method, the 'double difference with sat' observable can be obtained by a single channel rece ver. Furthermore, an unbiased weighted average method was recommended which coorperates all common view paths between two stations.