中文摘要：

基于低低卫-卫跟踪重力卫星的轨道特性，从垂直和水平两个方向计算了重力卫星高空扰动引力，并根据其谱特性及星载加速度的测量噪声水平分析了重力卫星能反演重力场的阶数．利用EGM96重力场模型分别计算了400km、450km和500km轨道高度处重力卫星受到的扰动引力谱及扰动引力谱的平均量级，分析其垂直特性表明：在三个轨道高度处能分别能反演150、140和130阶的重力场模型．利用两颗同轨重力卫星相距220km的特性，计算了400km、450km和500km轨道高度处纬度相差2°的两颗卫星纬向扰动引力差，即扰动引力水平分量，分析其谱特性，表明：重力卫星能反演至117阶的地球重力场模型．

英文摘要：

In this paper, the spatial resolution of the earth gravity is discussed by analyzing the vertical and horizontal spatial disturbance gravity spectra, based on the noise of accelerometer and the orbit characteristics of the low-low tracking satellite. The radial disturbance gravity and the mean disturbance gravity of 400,450 and 500 kilometers height are computed using the EGM96 gravity field model. Analyzing the vertical gravity disturbance spectrum characteristics, we have concluded that a new gravity [ield model of 150,140 and 130 degree at the three heights can be recovered. The latitudinal disturbance gravity difference of the two gravimetry satellites which were at the same orbits and at the distance of 220 kilometers was computed. Analyzing the horizontal disturbance gravity difference spectrum, we conclude that the gravity field can be recovered to a degree and order 117.