顾及GEO卫星约束的长距离BDS三频整周模糊度解算  

The integer ambiguity resolution of BDS triple-frequency between long range stations with GEO satellite constraints

作　　者：祝会忠[1] 雷啸挺 徐爱功[1] 李军[1] 高猛[1] ZHU Huizhong;LEI Xiaoting;XU Aigong;LI Jun;GAO Meng(School of Geomatics 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,辽宁阜新123000

出　　处：《测绘学报》2020年第9期1222-1234,共13页Acta Geodaetica et Cartographica Sinica

基　　金：国家重点研发计划(2016YFC0803102);辽宁省重点研发计划(2020JH2/10100044);国家自然科学基金(41904037)。

摘　　要：长距离BDS三频载波相位整周模糊度解算受大气误差残余的影响较大,GEO卫星相对于地球静止也非常不利于载波相位整周模糊度的解算。利用GEO卫星的信号传播路径相对较稳定、大气延迟误差的影响不随卫星空间位置变化的特点,对GEO卫星进行更符合实际情况的大气延迟误差约束研究。利用GEO卫星B2和B3载波相位整周模糊度线性关系,降低测站差分电离层延迟误差残余对模糊度备选值的影响,进行B2和B3载波相位整周模糊度备选值的选择。通过三频载波相位整周模糊度间不包含观测误差影响的线性关系对模糊度备选值组合进行检测,并对模糊度搜索空间进行约束。利用历元间GEO卫星的模糊度备选值判断历元间电离层延迟误差残余的变化,对GEO卫星的参数估计进行更符合实际情况的约束。研究了顾及GEO卫星实际大气延迟变化和整周模糊度约束的长距离BDS三频载波相位整周模糊度解算方法。提出了利用历元间模糊度备选值确定电离层延迟约束值的方法,对GEO卫星历元间随机游走的约束值进行符合实际情况的调整。试验结果表明,本文的方法能够提高三频载波相位整周模糊度解算的效率和测站位置的精度。The BDS triple-frequency carrier phase ambiguity resolution is greatly affected by the residual of atmospheric error between long range stations,and GEO satellites are also unfavorable for carrier phase ambiguity resolution relative to geostationary.Taking advantage of the relatively stable signal path of GEO satellites and the influence of atmospheric delay which do not change with the space position of satellites,the constraint of atmospheric delay errors more in line with actual conditions for GEO satellites are carried out.Using the linear relationship of carrier phases ambiguities of GEO satellites B2 and B3 to reduce the effect of single-difference ionospheric delay error between stationson the ambiguity candidates,the candidates of carrier phases ambiguity of B2 and B3 areselected.The linear relationship of triple-frequency phase ambiguity which does not include the influence of errors makes evaluation of the ambiguity candidates,and the ambiguity search space can be constrained.The ambiguity candidates of the GEO satellites are used to determine the residual change of the ionospheric delay between adjacent epochs,and the parameter estimation of GEO satellites is more constrained in accordance with actual situation.The method of long range BDS triple-frequency carrier phase ambiguity resolution with actual atmospheric delay variation constraints and the integer ambiguity constraints of GEO satellite is studied.And determining the ionospheric delay constraint value by using the candidates of ambiguity between epochs is proposed,adjusting the constraint value of the random walk between GEO satellite according to the actual situation.The experimental results show that the method in this paper can improve the efficiency of the triple-frequency carrier phase ambiguity resolution and the accuracy of positioning.

关 键 词：GEO卫星 载波相位整周模糊度 电离层延迟误差 对流层延迟误差 长距离 

分 类 号：P228[天文地球—大地测量学与测量工程]