导航定位学报
導航定位學報
도항정위학보
Journal of Navigation and Positioning
2015年
3期
95-99
,共5页
HY-2A卫星%精密定轨%DORIS%重力场模型
HY-2A衛星%精密定軌%DORIS%重力場模型
HY-2A위성%정밀정궤%DORIS%중력장모형
HY-2A satellite%precise orbit determination%DORIS%gravity field model
针对不同重力场模型对定轨精度影响存在差异的问题，采用了2012-09-08～2012-09-10的 HY-2A 卫星 DORIS距离变率数据，利用动力学定轨方法和 COWELL II 数值积分法，研究了不同阶次 GGM02C 重力场模型对 HY-2A 定轨精度的影响；探讨了 GGM02S、JGM3、EGM96和 EGM2008等重力场完全到80阶次时的定轨精度。研究结果表明：80阶次的 GGM02C 和 EGM2008重力场模型均可使三天弧段的 HY-2A 径向定轨精度达0．84 cm，三维精度达4．04 cm，而其他重力场模型定轨精度低于该精度。
針對不同重力場模型對定軌精度影響存在差異的問題，採用瞭2012-09-08～2012-09-10的 HY-2A 衛星 DORIS距離變率數據，利用動力學定軌方法和 COWELL II 數值積分法，研究瞭不同階次 GGM02C 重力場模型對 HY-2A 定軌精度的影響；探討瞭 GGM02S、JGM3、EGM96和 EGM2008等重力場完全到80階次時的定軌精度。研究結果錶明：80階次的 GGM02C 和 EGM2008重力場模型均可使三天弧段的 HY-2A 徑嚮定軌精度達0．84 cm，三維精度達4．04 cm，而其他重力場模型定軌精度低于該精度。
침대불동중력장모형대정궤정도영향존재차이적문제，채용료2012-09-08～2012-09-10적 HY-2A 위성 DORIS거리변솔수거，이용동역학정궤방법화 COWELL II 수치적분법，연구료불동계차 GGM02C 중력장모형대 HY-2A 정궤정도적영향；탐토료 GGM02S、JGM3、EGM96화 EGM2008등중력장완전도80계차시적정궤정도。연구결과표명：80계차적 GGM02C 화 EGM2008중력장모형균가사삼천호단적 HY-2A 경향정궤정도체0．84 cm，삼유정도체4．04 cm，이기타중력장모형정궤정도저우해정도。
In view of the different impact of different gravity models on orbit determination accuracy,DORIS range rate da-ta of HY-2A were applied from 8 September to 10 September in 2012,dynamic method and COWELL II numerical integrator were used to compute the orbit of HY-2A,the impacts on orbit accuracy from different orders and degrees of GGM02C were analyzed in detail,and the orbits of HY-2A were computed using GGM02S,EGM96,EGM2008 and JGM3 gravity field mod-els respectively.The results indicated that the highest computed accuracy of orbits are derived from EGM2008 or GGM02C gravity field model with 80 degrees and orders compared with the other three gravity models,and the radial and 3-demension accuracy can reach 0.84 cm and 4.04 cm respectively.
