Quality Analysis Of Airborne Gravity Survey Results

Based on the CHAGS in the actual production of the measured data, this paper mainlyresearch the airborne gravity measurement data quality effect by the follows: the design ofsurvey area boundary during actual production, the distance between GPS base station andarrangement line, the numeration of the GPS base station coordinates, flights in turbulence andthe error of data calculation; emphasize particularly on effects of each link in airborne gravitymeasurement of actual production to the airborne gravity data accuracy. The main works of thispaper are summarized as follows.1Based on the condition of airborne gravity measurement of actual production, expatiatedon how to carry out the inspection, testing and debugging of the airborne gravity measurementsystem before to carry into execution.2According to the practical work, this article describes how to design a scientific andrational plan and the implementation process in the implementation of the detailed process.3Analysis the effect of the distance between GPS base station and arrangement line onaccuracy of airborne gravity measurement data theoretically and practically. Known from theanalysis, the accuracy is better than1mGal. It fills the need to estimate the precision by thediscrepant values of the crossing point among the entire area,(less than20%of thecrossing-point discrepancy value larger than30mGal). In some special instances, the conditionsof layout of GPS base station distance can be declined appropriately, it has great significance tothe actual production of airborne gravity measurement.4This paper analysis the effect of only using commercially available software to calculatethe position of GPS base station on overall accuracy of airborne gravity measurement with themeasured data. According to the calculate result, influence of the software is least than0.2mGal,which completely meets the requirement of accuracy.5This paper describes process of experiment in detail and studies influence of the design ofzone boundary on the accuracy with real data in this experiment. According to calculation andanalysis, if the boundary of coverage is designed enough long, the influence may be as much as10mGal. So, the prolongation of coverage boundary must be chosen properly.6Through analysis of real data, the influence of flight measurement on measurementaccuracy is studied. Flight measurement is mainly influenced by the influence of atmosphericturbulence. The relationship between Atmospheric turbulence and feature parameter of plane hasa huge impact to aircraft vertical acceleration.7According to the accuracy of3years real data of airborne gravity measurement in the sea, coastal land and sea at the junction, the standard deviations of gravity anomaly discrepancy are±2.2mGal,±3.5mGal and±3.9mGal.