多类卫星重力梯度仪误差特性及其重力场探测性能OA

We numerically simulate the error characteristics and global static gravity field detection performance of cold atom interference(CAI)gradiometer,electrostatic gradiometers(EA,Mi-croSTAR,GOCE),and their combined satellite gravity gradiometers(CAI-EA,CAI-MicroSTAR)in the nadir-pointing mode,and deeply analyze the gravity gradient observation noise contributed by ac-celerometers and angular velocity of satellite rotation at the design level.Based on the simulated gradi-ent observations of near-polar satellite orbits at 200 km and 250 km altitude for 90 d,we analyze the ability of different types of gradiometers and different noise levels in static gravity field inversion.The results show that CAI can significantly reduce low-frequency noise levels.The performance of com-bined gradiometers in gravity field inversion is better than EA,MicroSTAR and GOCE,considering the nominal noise of electrostatic gradiometers and the different noise levels of CAI,and CAI whose noise approximates white noise is better than electrostatic gradiometers in low degree.When the orbit altitude is 200 km and the accuracy of CAI accelerometers is 3.5 × 10-12 m/(s2·√Hz),the cumula-tive geoid errors of CAI-EA,CAI-MicroSTAR and GOCE gradiometers are 2.9 cm,3.2 cm and 3.7 cm at the degree of 300,and the highest degrees which the cumulative geoid error is 1 cm are 250,240 and 225,respectively.