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中文摘要：
利用141天GRACE卫星观测资料,包括K波段、星载加速度和卫星轨道数据,反演了80阶地球重力场模型IGGGRACE01S,该模型在半波长为500km的空间分辨率上,确定大地水准面的精度约为0.012m,中长波（＜80阶）精度优于重力卫星发射以前研制的重力场模型.与EIGEN-GRACE02S、EIGEN-CHAMP03S和EGM96模型的位系数相比,该模型系数最接近于EIGEN-GRACE02S,与另两个模型差异较大.比较几种模型确定的全球重力异常和大地水准面起伏,结果发现IGGGRACE01S与EIGEN-GRACE02S模型的计算结果比较接近,与EGM96模型结果差异较大,差别较大地区主要在南极等地区.对于中国大陆,比较IGGGRACE01S模型（前72阶）计算的重力异常和NIMA重力异常数据（2.5°×2.5°网格）,两者之间的标准偏差为4.8mGal.
英文摘要：
An Earth＇ s gravity field model IGGGRACE01S has been derived from 141 days of GRACE tracking data, including K-band, accelerometer, satellite orbit data. The model resolves the geoid with an accuracy of about 0.012m at a resolution of 500km half-wavelength, it improves the accuracy of the gravity field model in the long- to medium-wavelength part （ 〈 80 degree） than pre-CHAMP model. Comparing the coefficients of IGGGRACE01S, EIGEN-GRACE02S, EIGEN-CHAMP03S, and EGM96 models, the result shows that the coefficients of IGGGRACE01S are close to those of EIGEN-GRACE02S, and much different to those of the other two models. Comparing the geoid undulations and gravity anomalies derived from the above-mentioned models, the results indicate that the IGGGRACE01S solution is close to EIGEN-GRACE02S solution, and there exist large differences between IGGGRACE01S and EGM96 in Antarctica region. Comparing the gravity anomalies derived from IGGGRACE01S （72 degree） with NIMA gravity anomalies data （2.5°×2.5°） , the standard deviation is 4.8 mGal in China land region.
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