360阶地球重力场模型DQM94A及其精度分析

A NEW EARTH'S GRAVITY FIELD MODEL DQM94AAND ITS PRECISION ESTIMATION

介绍了适用于中国地区的３６０阶地球重力场模型ＤＱＭ９４Ａ．精度分析结果表明，应用局部积分改进的谱权综合法计算的３６０阶地球重力场模型ＤＱＭ９４Ａ，在表示中国境外地球重力场时，与用改进的基本模型ＯＳＵ９１Ａ精度相当；表示中国及其周边地区地球重力场的精度如下，用模型计算的３０＇×３０＇和１°×１°平均重力异常与相应实测结果较差的均方根基分别为±９．３０×１０（－５）ｍ／ｓ２和±７．６５×１０（－５）ｍ／ｓ２，在中国３７个ＧＰＳ点上，由ＤＱＭ９４Ａ计算的大地水准面高的精度为±０．８８ｍ．

A new geopotential coefficient model DQM94A computed by the method of the regional correction with frequency weight is presented in this paper.The results from precision estimation indicate that the precision of the model DQM94A expressing globle gravity field is the same as one of the model OSU91A,and that theRMSES of the differences between 30’× 30’and 1°×1° mean free-air anomaly computed from DQM94A and the anomaly from field measurement in China are scperately ±9.30 × 10(-5)m/s2 and ±7.65×10(-5)m/s2. The error of DQM94A expressing the geoid heights at 37 GPS stations in China is ±0.884m.