新一代Microg LaCoste SⅢ型海洋重力仪同船比测分析

Comparison and Analysis of the New Generation Microg LaCoste SⅢ Marine Gravimeter on the Same Ship

为检验新一代美国Microg LaCoste SⅢ型海洋重力仪的工作性能,验证其获取重力数据的可靠性,本文进行了2套SⅢ型海洋重力仪同船比测试验。介绍了SⅢ型重力仪重力读数公式计算,按照海洋重力调查规范要求分别处理了2套设备的原始数据,对2套重力仪得出的自由空间重力异常数据的交叉点不符值、重复测线内符合、同线外符合精度进行对比及相关性分析。数据比对结果表明,2套设备测量精度相当,空间重力异常趋势一致,测量数据高度线性相关。此次同船比测试验结果显示,美国新一代Microg LaCoste SⅢ型海洋重力仪系统运行稳定,测量精度较高。

In order to test the performance of the new generation of American Microg LaCoste SⅢ marine gravimeter and verify the reliability of its gravity data acquisition,the two SⅢ marine gravimeters were tested on the same ship.This paper introduces gravity reading calculation of SⅢ gravimeter,according to the requirements of marine gravity survey specification,the original data of two sets of equipment are processed respectively,and the cross point accuracy,internal coincidence and external coincidence accuracy of the gravity anomaly data from two sets of gravimeters are compared and analyzed.The result of data comparison shows that the measurement accuracy of the two sets of equipment is similar,the trend of space gravity anomaly is consistent,and the measurement data of the two sets of instruments are highly linearly correlated.According to the results of the same ship comparison,it is considered that the new generation of Microg LaCoste SⅢ marine gravimeter system of the United States is stable in operation and has high measurement accuracy.