CAJ | 학술논문

卫星位置误差和钟差是GPS导航与定位的重要误差源。通过N T RIP协议，利用Internet方式向全球发布实时广播星历的卫星轨道和钟差改正信息。结果表明：由广播星历计算得到的卫星位置和精密星历中给出的位置值相差为分米级，而经过改正后的卫星位置相差仅为厘米级。采用广播星历中给出的钟差参数，其精度约为2～4 ns；经过钟差改正后，精度相差约0.3～0.4 ns ．
위성위치오차화종차시GPS도항여정위적중요오차원。통과N T RIP협의，이용Internet방식향전구발포실시엄파성력적위성궤도화종차개정신식。결과표명：유엄파성력계산득도적위성위치화정밀성력중급출적위치치상차위분미급，이경과개정후적위성위치상차부위전미급。채용엄파성력중급출적종차삼수，기정도약위2～4 ns；경과종차개정후，정도상차약0.3～0.4 ns ．
Satellite position error and clock error are an important error source of GPS positioning and navigation .Based on the NTRIP agreement ,this article makes use of the In‐ternet to publish real‐time broadcast ephemeris of satellite orbit and clock correction informa‐tion to the global .Results show that the satellite position calculated by the broadcast ephem‐eris and the position given by precise ephemeris value differs as the decimeter level ,howev‐er ,after correction ,satellite position differs only to cm .Using the clock difference parame‐ters given by the broadcast ephemeris ,the accuracy is about 2~4 ns;After the clock error correction ,the accuracy is about 0.3~0.4 ns .