National Space Institute, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
Sensors (Basel). 2018 Sep 16;18(9):3121. doi: 10.3390/s18093121.
Airborne gravimetry from a helicopter has been a feasible tool since the 1990s, with gravimeters mounted on a gyro-stabilised platform. In contrast to fixed-wing aircrafts, the helicopter allows for a higher spatial resolution, since it can move slower and closer to the ground. In August 2016, a strapdown gravimetry test was carried out over the Jakobshavn Glacier in Greenland. To our knowledge, this was the first time that a strapdown system was used in a helicopter. The strapdown configuration is appealing because it is easily installed and requires no operation during flight. While providing additional information over the thickest part of the glacier, the survey was designed to assess repeatability both within the survey and with respect to profiles flown previously using a gyro-stabilised gravimeter. The system's ability to fly at an altitude following the terrain, i.e., draped flying, was also tested. The accuracy of the gravity profiles was estimated to 2 mGal and a method for inferring the spatial resolution was investigated, yielding a half-wavelength spatial resolution of 4.5 km at normal cruise speed.
自 20 世纪 90 年代以来，直升机搭载陀螺仪稳定平台的航空重力测量已经成为一种可行的工具。与固定翼飞机相比，直升机可以以更低的速度更靠近地面移动，从而实现更高的空间分辨率。2016 年 8 月，在格陵兰的雅各布港冰川上进行了一项捷联式重力测量试验。据我们所知，这是直升机首次使用捷联式系统。捷联式配置很有吸引力，因为它易于安装，并且在飞行过程中不需要操作。虽然该测量在冰川最厚的部分提供了更多信息，但该测量旨在评估测量内的可重复性以及与之前使用陀螺仪稳定重力仪飞行的剖面的可重复性。还测试了该系统按照地形高度飞行的能力，即拖曳飞行。重力剖面的精度估计为 2 毫伽，并且研究了一种推断空间分辨率的方法，在正常巡航速度下得到的空间分辨率为 4.5 公里的半波长。
