估计北斗卫星钟差频间偏差的一种方法

A Method for Estimating BeiDou Inter-frequency Satellite Clock Bias

针对北斗频间卫星钟差偏差现有估计方法的不足,提出一种估计方法。该方法不仅顾及频间卫星钟差偏差的变化部分也顾及了其常数部分。采用10个观测站数据,验证了本文提出的算法,分析了北斗频间卫星钟差偏差的特性。在短期内,北斗频间卫星钟差偏差常数部分具有稳定性。对采用新算法计算得到的北斗频间卫星钟差偏差进行了模型化,结果表明,每颗卫星对应的频间钟差偏差可以利用10个参数予以高精度表示,对应精度可以达到厘米级。当采用第1天的模型参数进行第2天频间卫星钟差偏差值计算时,可实现厘米级结果。基于北斗频间卫星钟差偏差的稳定性与可模型化性,提出了高精度北斗卫星钟差服务策略,为我国高精度北斗卫星钟差服务提供参考。

A new method for estimating the BeiDou inter-frequency satellite clock bias is proposed,considering the shortage of the current methods.The constant and variable parts of the inter-frequency satellite clock bias are considered in the new method.The data from 10 observation stations are processed to validate the new method.The characterizations of the BeiDou inter-frequency satellite clock bias are also analyzed using the computed results.The results of the BeiDou inter-frequency satellite clock bias indicate that it is stable in the short term.The estimated BeiDou inter-frequency satellite clock bias results are molded.The model results show that the 10 parameters of model for each satellite can express the BeiDou inter-frequency satellite clock bias well and the accuracy reaches cm level.When the model parameters of the first day are used to compute the BeiDou interfrequency satellite clock bias of the second day,the accuracy also reaches cm level.Based on the stability and modeling,a strategy for the BeiDou satellite clock service is presented to provide the reference of our BeiDou.