Strapdown Airborne Gravimetry Using a Combination of Commercial Software and Stable-Platform Gravity Estimates

Tim E. Jensen, J. Emil Nielsen, Arne V. Olesen, Rene Forsberg

Research output: Chapter in Book/Report/Conference proceedingBook chapterResearchpeer-review

Abstract

For the past two decades, airborne gravimetry using a Strapdown Inertial Measurement Unit (SIMU) has been producing gravity estimates comparable to the traditional stable-platform single-axis gravimeters. The challenge has been to control the long term drift of the IMU sensors, propagating into the long-wavelengths of the gravity estimates. This has made the stable-platform approach the preferred method for geodetic applications. In the summer of 2016, during a large airborne survey in Malaysia, a SIMU system was flown alongside a traditional LaCoste&Romberg (LCR) gravimeter. The SIMU observations were combined with GNSS observations using the commercial software product “Inertial Explorer” from NovAtel’s Waypoint software suite, and it is shown how gravity estimates can be derived from these results. A statistical analysis of the crossover differences yields an RMS error of 2.5 mGal, which is comparable to the results obtained from the LCR gravimeter. The properties of the SIMU and LCR systems are compared and a merging of the two is performed. A statistical analysis of the crossover differences of the merged product yields an RMS error of 1.3 mGal. These results indicate that the properties of the two units are complementary and that a combination of the two can result in improved gravity estimates.
Original languageEnglish
Title of host publicationInternational Symposium on Gravity, Geoid and Height Systems 2016. International Association of Geodesy Symposia
EditorsG. Vergos , R. Pail, R. Barzaghi
Volume148
Place of PublicationBerlin, Heidelberg
PublisherSpringer
Publication date2017
Pages103-109
ISBN (Print)978-3-319-95317-5
ISBN (Electronic)978-3-319-95318-2
DOIs
Publication statusPublished - 2017
SeriesInternational Association of Geodesy Symposia
ISSN0939-9585

Keywords

  • Airborne gravimetry
  • Inertial Explorer
  • Strapdown IMU

Cite this

Jensen, T. E., Nielsen, J. E., Olesen, A. V., & Forsberg, R. (2017). Strapdown Airborne Gravimetry Using a Combination of Commercial Software and Stable-Platform Gravity Estimates. In G. Vergos , R. Pail, & R. Barzaghi (Eds.), International Symposium on Gravity, Geoid and Height Systems 2016. International Association of Geodesy Symposia (Vol. 148, pp. 103-109 ). Berlin, Heidelberg: Springer. International Association of Geodesy Symposia https://doi.org/10.1007/1345_2017_9