CAJ | 학술논문

为减弱电离层延迟对单频PPP用户定位精度和收敛时间的影响，首先对区域CORS基准站进行非组合精密单点定位，提取站点各卫星倾斜方向伪电离层延迟值及天顶对流层延迟值；然后，通过加入区域电离层多项式拟合模型约束，分离卫星和接收机硬件延迟偏差项，还原卫星倾斜方向电离层延迟真实值。最后，针对单频PPP用户，提出了一种基于电离层加权的精密单点定位方法，该方法充分利用区域站点提供的高精度电离层延迟信息，提供用户电离层穿刺点处电离层内插值，构建卡尔曼滤波器进行定位解算。利用江苏CORS进行实验验证，结果表明：网内网外单频PPP用户均可在30 min内达到10 cm以内定位精度，滤波收敛后可实现1～2 cm的平面定位结果，相比常规单频PPP定位方法提升了一个数量级。
위감약전리층연지대단빈PPP용호정위정도화수렴시간적영향，수선대구역CORS기준참진행비조합정밀단점정위，제취참점각위성경사방향위전리층연지치급천정대류층연지치；연후，통과가입구역전리층다항식의합모형약속，분리위성화접수궤경건연지편차항，환원위성경사방향전리층연지진실치。최후，침대단빈PPP용호，제출료일충기우전리층가권적정밀단점정위방법，해방법충분이용구역참점제공적고정도전리층연지신식，제공용호전리층천자점처전리층내삽치，구건잡이만려파기진행정위해산。이용강소CORS진행실험험증，결과표명：망내망외단빈PPP용호균가재30 min내체도10 cm이내정위정도，려파수렴후가실현1～2 cm적평면정위결과，상비상규단빈PPP정위방법제승료일개수량급。
In order to weaken the influence of ionospheric delay to positioning accuracy and conver-gence time of single-frequency precise point positioning ( PPP) users, the fake slant ionospheric de-lay between satellites and stations and the zenith tropospheric wet delay are extracted from the un-combined precise point positioning technology based on the regional continuous operational reference system ( CORS ) .Then, the real slant ionospheric delay is calculated through the satellites and receivers'hardware delay bias, which is separated by the region the ionosphere polynomial model. Besides, a new PPP method based on the ionosphere weighted model for the single-frequency PPP users is put forward, which makes full use of the precise ionospheric delay extracted from the region-al reference stations and gives the interpolation of the ionospheric delay.Finally, the position result is resolved by the Kalman filter.The test data from the CORS stations in Jiangsu show that compared with the conventional methods, the new method can enhance the magnitude of the single-frequency PPP positioning results.The single-frequency PPP users, who are inside or outside the regional CORS network, can achieve the position result in 10 cm within 30 min.What's more, the plane po-sition result in 1 to 2 cm can also be achieved after the convergence of the filter.