基于伪距/相位OSB的多频多模PPP-AR及其性能评估  

Multi-frequency and Multi-constellation PPP-AR Based on Pseudorange/Phase OSB and Its Performance Evaluation

作　　者：董岳 张小红[1,2,3] 任晓东 DONG Yue;ZHANG Xiaohong;REN Xiaodong(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Hubei Luojia Laboratory,Wuhan 430079,China;Chinese Antarctic Center of Surveying and Mapping,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,湖北武汉430079 [2]湖北珞珈实验室,湖北武汉430079 [3]武汉大学中国南极测绘研究中心,湖北武汉430079

出　　处：《测绘地理信息》2023年第3期1-6,共6页Journal of Geomatics

基　　金：国家自然科学基金(42174031,41904026);湖北珞珈实验室开放基金(2201000038)。

摘　　要：在进行多频多模全球导航卫星系统(global navigation satellite system,GNSS)精密单点定位(precise point positioning,PPP)时,以相对形式表达的伪距差分码偏差(differential code bias,DCB)和相位小数周偏差(fractional cycle bias,FCB)种类繁多且修正方法较为复杂。基于此,首先给出了相对形式的伪距/相位偏差与原始观测值上的绝对偏差(observable-specific signal bias,OSB)的转换方法,以及利用该偏差进行非差模糊度固定的具体流程;然后通过实测数据分析不同偏差形式下的PPP模糊度解算(PPP-ambiguity resolution,PPP-AR)定位性能。结果表明,无论是多系统PPP还是多频PPP,其基于OSB的PPP-AR定位精度、收敛时间及固定率均与相对形式DCB/FCB的PPP-AR定位结果相当。其中,三频PPP-AR的动态和静态收敛时间均优于双频,多系统PPP-AR定位的初始化时间和定位精度也均优于单系统。伪距/相位OSB可直接用于修正对应的观测值,减少偏差处理中的组合与转换,并简化GNSS PPP数据处理流程,提高了频率选择的灵活性,使用户端算法更简单方便。In multi-frequency and multi-constellation global navigation satellite system(GNSS)precision point posi⁃tioning(PPP),the relative biases such as pseudo-range dif⁃ferential code bias(DCB)and phase fractional cycle bias(FCB)are various and difficult to be corrected.We present a method to convert the relative bias of pseudo-range/phase in⁃to an absolute form,i.e.,observable-specific signal bias(OSB).A specific flow chart to fix the undifferenced ambigui⁃ty is also described by the OSB.In addition,we analyze and compare the PPP ambiguity solution(PPP-AR)based on dif⁃ferent bias forms.The results indicate that for both multi-con⁃stellation PPP and multi-frequency PPP,the positioning accu⁃racy,convergence time,and fixing rate of PPP-AR based on OSB are comparable to those of PPP-AR based on DCB/FCB.Among them,the kinematic and static convergence times of triple-frequency PPP-AR are better than those of dualfrequency PPP-AR,and the initialization time and positioning accuracy of multi-GNSS PPP-AR are also better than those of single-GNSS PPP-AR.It’s worth noting that OSB can be directly used to correct biases in PPP-AR,which not only re⁃duces the need for combination and transformation in bias pro⁃cessing,but also simplifies the processing procedures,thus im⁃proving the flexibility of frequency selection and benefiting the user-side service.

关 键 词：精密单点定位(precise point positioning PPP) 模糊度解算 多频多系统 绝对偏差 差分码偏差 相位小数周偏差 

分 类 号：P228[天文地球—大地测量学与测量工程]