Helicopter Test of a Strapdown Airborne Gravimetry System

Tim Enzlberger Jensen*, René Forsberg

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    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.
    Original languageEnglish
    Article number3121
    JournalSensors
    Volume18
    Issue number9
    Number of pages16
    ISSN1424-8220
    DOIs
    Publication statusPublished - 2018

    Keywords

    • Airborne gravimetry
    • Strapdown inertial measurement unit
    • Helicopter test
    • Kalman filter

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