BDS-3新频点PPP模糊度固定研究  

Study on PPP ambiguity resolution with BDS-3new frequency signals

作　　者：徐文康 党亚民[1] 许长辉[1] XU Wenkang;DANG Yamin;XU Changhui(Chinese Academy of Surveying and Mapping,Beijing 100036,China)

机构地区：[1]中国测绘科学研究院,北京100036

出　　处：《测绘科学》2023年第2期10-15,69,共7页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41974010);中国测绘科学研究院基本科研业务费项目(AR2203,AR2214)。

摘　　要：针对BDS-3新频点在精密单点定位解算中的模糊度固定问题,该文采用绝对信号偏差(OSB)改正的方法,对B2a频点在精密单点定位方面的性能进行了研究。首先通过与整数钟差法进行对比实验,验证OSB改正法在模糊度固定方面的可靠性,之后采用该方法对B2a频点构建的双频无电离层组合进行精密单点定位-模糊度固定(PPP-AR)实验,与B1I/B3I的PPP-AR结果进行比较,评估定位精度。结果表明,OSB改正原始观测值的模糊度固定方法有较好的可靠性,收敛速度提升20%,模糊度固定成功率在90%以上;新频点B2a的精密单点定位性能较好,收敛速度和定位精度与B1I、B3I频点相当,采用B2a频点得到的双频无电离层组合在PPP-AR解算时能完成模糊度的快速固定,收敛时间在25 min以内,收敛后误差小于2 cm, B2a频点可用于PPP-AR解算。Aiming at the problem of ambiguity resolution in precise point positioning with new BDS-3 frequency signal,this paper studied the performance of B2afrequency in precise point positioning by using the method of observable-specific bias(OSB)correct.First,the reliability of observable-specific bias(OSB)method in precise point positioning-ambiguity resolution(PPP-AR)was verified by comparing with integer phase clock method.Then,the PPP-AR experiment based on the dual-frequency ionosphere-free combination constructed with B2afrequency was performed by OSB method,and the results were compared with those of B1I/B3Ifrequency to evaluate the positioning accuracy.The results showed that,the OSB method had good reliability,convergence speed was increased by 20%,and the ambiguity fixed rate reached 90%.The precise point positioning performance of the new frequency B2awas no less than that of B1Iand B3I.The dual-frequency ionosphere-free combination constructed with B2afrequency could make the integer ambiguity in PPP fixed quickly.The convergence time was less than 30minutes,and the convergence error was less than 2cm.Therefore,B2afrequency could be used for PPP-AR solution.

关 键 词：模糊度固定 BDS-3新频点 绝对信号偏差 精密单点定位 

分 类 号：P228[天文地球—大地测量学与测量工程]