Airborne Gravity 2010 - Geoscience Australia

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Airborne Gravity 2010 Figure 5. An example of free-air anomaly values obtained during ground based repeatability tests using the system mounted in a van. Software Solutions Two separate software components are required for the acquisition and processing stages to obtain optimal data quality from the system (Figure 6 and Figure 7). A large part of the development time was taken up modelling the behaviour of the platform and writing the processing software so that the system could truly be operated as a turnkey solution by relatively inexperienced operators. This resultant “AeroGrav” software allows the user to import the gravity data and the GPS data from both the onboard system and a base station to quickly produce a Free Air or Bouguer gravity anomaly plot for any selected survey line. As has been noted already, one of the more significant problems in airborne gravity is to separate inertial and gravity components of acceleration. Accurate knowledge of the sensor location in space allows the inertial acceleration component to be determined. This position information is usually obtained with a GPS or Inertial Navigation System (INS). Each GPS data point has some noise associated with it which results in an uncertainty of position. Aircraft survey speed is typically around 60 m/s but can be up to 200 m/s for some applications such as geoid measurements. At these speeds, position errors can be significant. To reduce the position errors, a base station is used to correct for atmospheric propagation effects. However, errors will still be present because of timing differences between the separate receivers. To minimise these GPS timing issues, a new piece of hardware, the timing unit, was added to the system. The timing unit uses a GPS receiver and a rubidium oscillator to improve timing synchronization between the GPS receivers and the gravity data to within a few tens of milliseconds. The AeroGrav software is used to select data segments from the recorded survey data and combine them with processed differential GPS data to produce free air gravity anomaly plots. The software can also be used to check the quality of any aspect of the data acquisition process including 31
Airborne Gravity 2010 aircraft flight characteristics and platform behaviour. The AeroGrav software uses proprietary algorithms for reduction of the gravity data and incorporates Waypoint GrafNav for GPS processing (NovAtel, n.d.). Figure 6. TAGS data acquisition software display. Figure 7. AeroGrav processing software main display. 32
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