BDS参考站间低高度角卫星三频整周模糊度解算方法  

The Algorithm of Triple-Frequency Integer Ambiguity Resolution for Low Elevation Angle Satellite between BDS Reference Stations

作　　者：高猛[1] 徐爱功[1] 祝会忠[1] 葛茂荣[1] 唐龙江[1] GAO Meng;XU Aigong;ZHU Huizhong;GE Maorong;TANG Longjiang(School of Mapping and Geographical Science,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学测绘与地理科学学院,辽宁省阜新市123000

出　　处：《大地测量与地球动力学》2021年第10期1035-1039,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41904037,42074012,42030109);辽宁省重点研发计划(2020JH2/10100044);辽宁省教育厅科研项目(LJ2019QL008)。

摘　　要：针对BDS参考站间低高度角卫星整周模糊度受大气延迟误差影响较大、难以正确固定等问题,提出一种BDS参考站间低高度角卫星三频整周模糊度确定方法:首先根据超宽巷整周模糊度长波长的优势确定双差超宽巷整周模糊度,并利用其与双差宽巷组合观测值所受电离层延迟误差较为接近的特性搜索确定双差宽巷整周模糊度;然后将双差整周模糊度之间的线性关系作为约束条件,高高度角卫星双差整周模糊度根据双频无电离层组合模型确定;利用固定模糊度的高高度角卫星建立参考站间双差电离层延迟误差空间线性模型,实现对低高度角卫星电离层延迟误差的削弱;最后将固定双差整周模糊度的高高度角卫星双差载波相位观测方程作为距离约束,进一步搜索确定低高度角卫星的双差整周模糊度。Integer ambiguity is affected by atmospheric delay error and it is difficult to correctly fix integer ambiguity for low elevation angle satellite between BDS reference stations.We propose the algorithm of triple-frequency ambiguity resolution for low elevation angle satellite between BDS reference stations.The advantage of long wavelength for extra-wide-lane integer ambiguity is used to determine double difference extra-wide-lane integer ambiguity.The double difference wide-lane integer ambiguity is searched and solved using the closer characteristic of ionospheric delay error between wide-lane combination observations.The linear relationship of double difference integer ambiguity is selected as a constraint condition,double difference integer ambiguity for high elevation angle satellite is searched and determined using dual-frequency ionosphere-free combination observation.The space linear model of double difference ionospheric delay error between reference stations is established using fixed double difference integer ambiguity for high elevation angle satellites,and the ionospheric delay error for low elevation angle satellites is weakened.Double difference carrier phase observation equation with fixed double difference integer ambiguity for high elevation angle satellite is selected as distance constraint,double difference integer ambiguity for low elevation angle satellite is searched and determined.This algorithm is tested by the measured triple-frequency data of BDS CORS network.The results indicate that triple-frequency integer ambiguity for low elevation angle satellites between BDS reference stations can be fixed accurately with the method.

关 键 词：BDS 低高度角 三频 整周模糊度 电离层延迟误差 

分 类 号：P288[天文地球—地图制图学与地理信息工程]