�����������㽨ģ�ĵ��㶨λӦ�÷���

???????????????CORS??????????????????????????????????????????????????????WHU???????????????????????λ??????????????WHU???????α????λ??SPP?????λ???????????CODE????SPP???????????CODE??WHU????PPP??λ????????????????????10%~30%?? ????1~1.5 dm?????2~2.5 dm??????WHU?????????PPP???ж?????????飬??????????????????????????λ?????????????????ж???????????????????á?

REGIONAL IONOSPHERIC MODELING AND ITS APPLICATION IN SINGLE POINT POSITIONING ANALYSIS

We extracted ionospheric delay from the combination observations, built the regional ionospheric model and then tested the WHU products by processing single point positioning for rover stations data. The validation of a provincial CORS (Continuously Operating Reference Stations) network confirms that the single frequency SPP of WHU product results present significantly better than CODE product and dual frequency SPP, at the same time, single frequency PPP accuracy increases by about 10%×30% in three directions compared with CODE product, can reach up to about 1 1.5dm in the north and east direction, and 2 2.5 dm in the up direction. Finally, we processed dual frequency PPP with WHU ionospheric product, the experimental results show that the precision ionospheric products play a significant role to improve the initial positioning accuracy, and accelerate dual frequency PPP convergence and interrupt re convergence.