New Results from Strapdown Airborne Gravimetry Using Temperature Stabilisation

Autor: Per-Anders Olsson, René Forsberg, Arne Vestergaard Olesen, Örjan Josefsson, Tim Enzlberger Jensen
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Remote Sensing, Vol 11, Iss 22, p 2682 (2019)
Jensen, T E, Olesen, A V, Forsberg, R, Olsson, P-A & Josefsson, Ö 2019, ' New results from strapdown airborne gravimetry using temperature stabilisation ', Remote Sensing, vol. 11, no. 22, 2682 . https://doi.org/10.3390/rs11222682
Remote Sensing; Volume 11; Issue 22; Pages: 2682
ISSN: 2072-4292
DOI: 10.3390/rs11222682
Popis: In recent years, the use of a strapdown Inertial Measurement Unit (IMU) for airborne gravimetry has proven itself to be an accurate and resilient measurement system, improving the operational flexibility. The main concern is erroneous long-wavelength information in the resulting estimates, which is suspected to originate from uncompensated long-term drift of the accelerometers, probably originating from temperature variation. For this reason, iMAR navigation has designed a temperature stabilisation box, which allows for temperature stabilisation of their IMU systems. On a regional airborne gravity survey over the Kattegat Sea between Denmark and Sweden, such a temperature stabilised strapdown IMU was operated alongside a traditional spring-type platform-stabilised gravity system from ZLS. An analysis of the difference in gravity estimates at cross-over locations yielded a mean value of −0.3 mGal for the iMAR system with an indicated accuracy of 1.0 mGal. The temperature stabilisation unit therefore effectively limits the accelerometer drift and improves the long-wavelength information. However, a straightforward merging approach, adjusting the line-based mean values of the iMAR estimates to match that of the ZLS estimates, improved the accuracy to 0.8 mGal. This indicates that the long-wavelength information of the stabilised-platform system is still superior to that of the strapdown system.
Databáze: OpenAIRE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje