航空重力梯度试验标度场的建立方法研究  

Study on establishing methods of reference field for airborne gravity gradient test

作　　者：滕民强 何浩源 李桐林[2] 康鑫泽 TENG Minqiang;HE Haoyuan;LI Tonglin;KANG Xinze(Heilongjiang Institute of Geophysical and Geochemical Exploration,Bureau of Geology and Mineral Resource of Heilongjiang Province,Harbin 150036,China;College of Geo-exploration Science and Technology,Jilin University,Changchun 130026,China)

机构地区：[1]黑龙江省地质矿产局黑龙江省地球物理地球化学勘查院,哈尔滨150036 [2]吉林大学地球探测科学与技术学院,长春130026

出　　处：《世界地质》2023年第2期343-350,共8页World Geology

基　　金：国家重点研发计划(2017YFC0601606)。

摘　　要：航空重力梯度测量受飞行区气流及飞机加速度等因素的影响,需要选择异常较弱的高度进行补偿飞行。为评价梯度仪测量效果和确定补偿飞行高度,需要建立相应高度的标准梯度场作为参考。笔者研究了利用地面重力数据通过曲面延拓和梯度转换建立标度场的方法,并开展了模型验证。利用该方法建立了吉林—黑龙江某航空重力梯度试验区在精度试验飞行高度和拟补偿飞行高度处的标度场,并确定了拟补偿飞行高度选取的可行性。此外,笔者还将延拓转换建立的重力梯度场和起伏地形正演场进行了比较。结果表明,两种方法建立的标度场均可用于梯度仪的测量精度评价和补偿飞行高度的选择。The measurement of airborne gravity gradient is affected by factors such as airflow in the flight area and aircraft acceleration,so it is necessary to select a height with weak anomaly for compensation flight.In order to evaluate the measurement effect of gradiometer and determine the compensation flight altitude,it is necessary to establish the standard gradient fields of the corresponding altitudes as references.For this reason,the method of establishing reference field by surface continuation and gradient transformation using ground gravity data is studied first,and the model verification is carried out.Then,using this method,the reference fields of an airborne gravity gradient test area in Jilin-Heilongjiang at the flight altitudes of precision test and compensation are established,and the feasibility of selecting the compensation flight altitude is determined.In addition,the gravity gradient field established by continuation and transformation is compared with the forward modeling field of undulating terrain.The results show that the reference fields established by the two methods can both be used to evaluate the measurement accuracy of the gradiometer and select the compensation flight altitude.

关 键 词：航空重力梯度测量 标准梯度场 曲面延拓 梯度转换 

分 类 号：P312.1[天文地球—固体地球物理学]