摘要
文章以相位观测值作为参考,构建伪距减相位几何无关模型,推导该模型的零基线单测站、单差、双差及历元差组合的期望及方差,并以实测北斗数据分析北斗GEO卫星和IGSO卫星信号测距精度及其整周模糊度固定的可行性。结果表明:GEO卫星信噪比短时间基本不变,且B2频率上GEO卫星和IGSO卫星信号测距精度均优于B1频率;GEO卫星双差变化比IGSO卫星更加平缓,且B2频率上的模糊度更加容易固定。
Referenced to phase observations, a geometry-free model using pseudorange minus phase was built in the paper. The expectation and dispersion of single-station, single-differenced, double-differ- enced and epoch-differenced on zero-baseline were deduced. And Beidou data was used to analyze signal range measurement precision of GEO satellite and IGSO satellite, as well as the feasibility of ambiguity resolution. The results showed that. signal to noise ratio of GEO satellite remained unchanged during short time and the B2 frequency signal range measurement precision of GEO satellite and IGSO satellite showed better than B1 frequency. Meanwhile, the double-differenced value of GEO satellite changed more smoothly and the B2 frequency ambiguity fixed more easily than B1 frequency.
出处
《测绘科学》
CSCD
北大核心
2014年第11期25-28,61,共5页
Science of Surveying and Mapping
基金
北京市科技创新平台(PXM2013_014225_000051)
北京市青年拔尖人才培育计划(CIT&TCD201304063)
北京市优秀人才培育资助
江苏省研究生培养创新工程基金资助项目(CXZZ11-0299)
安徽省自然科学基金(1308085QD71)
北京市教育科技计划面上项目(KM201410853006)
关键词
零基线
GEO
IGSO
测距精度
模糊度固定
zero-baseline
GEO
IGSO
range measurement precision
ambiguity resolution