Analysis on Orbit Determination of CE-3 with Different Lunar Gravity Field Model

With the latest lunar gravity field model GL0660b and LP 150Q, SGM150, we analyze the influence of different lunar gravity field models on orbit determination of CE-3. Firstly, the power spectrum and error spectrum of these three models are discussed. GL0660b model improves the spatial resolution and precision of spherical harmonic coefficients significantly.Then the free-air gravity anomaly of these three lunar gravity models are compared by truncating to different orders and degrees at different height.These three gravity field models are applied in the precision orbit determination. The results show that position overlap differences of 100 km×100 km orbit are about 22 m with GL0660b model truncated to 150 orders and degrees, the same level as those using LP150Q model and SGM150 model in full orders and degrees. For 100 km×15 km orbit, position overlap differences with GL0660b model truncated to 360 orders and degrees are at a level of 21 m, which is better than those using LP150Q and SGM150.