CAJ | 학술논문

为了改善实时精密单点定位的精度和时效性，利用区域CORS网络采集的GPS载波相位观测值与IGU预报星历，通过多参考站联合解算，实现了基于星间、历元间差分技术的精密卫星钟差快速解算，并与IGS分析中心提供的最终精密钟差产品进行了比较．研究了不同的参考站分布和参考站数目对钟差估计产生的影响．试验结果表明，利用该算法估计的实时精密卫星钟差与IGS最终精密钟差产品具有较好的一致性，相对卫星钟差的估计精度可达到0．08 ns，平均中误差为46．2 ps；卫星钟差的估计误差基本上都在0．2 ns以内，平均中误差为73．2 ps．增加站间距可以有效减弱对流层参数之间的空间相关性，在保证观测精度和解算速度的前提下，合理增加参考站数目，对钟差估计结果的精度有一定提高．所提出的算法运算量小，解算速度快，仅需要少量参考站的载波相位观测值便可以迅速获得较高精度的实时卫星钟差产品．
위료개선실시정밀단점정위적정도화시효성，이용구역CORS망락채집적GPS재파상위관측치여IGU예보성력，통과다삼고참연합해산，실현료기우성간、역원간차분기술적정밀위성종차쾌속해산，병여IGS분석중심제공적최종정밀종차산품진행료비교．연구료불동적삼고참분포화삼고참수목대종차고계산생적영향．시험결과표명，이용해산법고계적실시정밀위성종차여IGS최종정밀종차산품구유교호적일치성，상대위성종차적고계정도가체도0．08 ns，평균중오차위46．2 ps；위성종차적고계오차기본상도재0．2 ns이내，평균중오차위73．2 ps．증가참간거가이유효감약대류층삼수지간적공간상관성，재보증관측정도화해산속도적전제하，합리증가삼고참수목，대종차고계결과적정도유일정제고．소제출적산법운산량소，해산속도쾌，부수요소량삼고참적재파상위관측치편가이신속획득교고정도적실시위성종차산품．
In order to improve the accuracy and timeliness of real-time precise point positioning, by means of GPS ( global positioning system) carrier phase observations collected in a regional CORS ( continuous operational reference system) network and the IGU ( international global navigation sat-ellite system service ultrarapid ) predicted ephemeris, the computation of real-time precise satellite clock offsets based on epoch-difference and satellite-difference technology is quickly realized by the method of joint calculations with multiple reference stations.The clock sequence is compared with the products provided by IGS ( international global navigation satellite system service) analysis cen-ters, and the influence of different station distributions and numbers of stations on the clock offset determination is also studied.The experimental results indicate that the real-time precise satellite clock products calculated by the proposed algorithm are equal to IGS final products.The estimation accuracy of relative satellite clock offsets can be achieved 0.08 ns, and their average standard devia-tion is 46.2 ps;the estimation error of satellite clock offsets is basically within 0.2 ns, and the aver-age standard deviation is 73 .2 ps.In addition, the spatial correlativity among tropospheric delay parameters can be effectively reduced by increasing the station spacing, and on the premise of ensu-ring the observation accuracy and computation speed, the clock estimation accuracy can be further enhanced by a reasonable increase in the number of stations.The algorithm has a smaller amount of arithmetic operations and a faster computation speed, and more accurate real-time satellite clock products can be quickly obtained with GPS carrier phase observations provided by only a small num-ber of reference stations.