Marine Gravity Measurement Data Quality Check Method Based On The External Data Source

At present, although the means of marine gravity measurement technology has undergone substantial changes, but as the conventional technology of marine gravity measurement, boat-load gravity measurement is still the main way to obtain high-precision Marine gravity field information. Thanks to the decades of development, marine boat-load gravity measurement technology already have relatively mature theory and method, and the perfect workflow and data processing system has also been formed. However, in some cases particularly harsh sea conditions, marine gravity measurement accuracy of the results does not meet the demand of specification. In addition, the quality inspection and evaluation of marine gravity measurement data still use the main and vice line crossing point discrepancy as the internal check. The crossing point can reflect partial information of the surveying area data quality, but due to the limited scope of the cross area, it can not fully reflect the results quality of marine gravity measurement data in the whole area, at the same time, this accuracy inspection method of internal fitness can not find the systematic error exists in the whole area. At present, the high order EGM2008 model of gravity anomaly and satellite gravity anomaly data set have high accuracy and resolution, as the external check data source, they can help find possible relic gross error and system error.Based on this, this paper according to the marine gravity measurement data may be affected by the random error, system error and gross error and other factors, carried out the analysis and research of marine gravity measurement error source, focused on the influence of marine gravity measurement environment action and system error compensation method, marine gravimeter stability test and data processing method, super high order global gravity field model parameters calculation and gross error detection methods. Its aim is to provide technical support for marine gravity data detailed processing, to ensure the results quality are stable and reliable. The main research results as followed:1. Based on the summarizing of the boat-load gravity data pretreatment process, focused on the analysis of the error of gravimeter lag effect, the actual route deviates from the planned route, jump caused by gravimeter, and established the corresponding model of gross error detection.2. Improved the E?tv?s correction method, that is to say, firstly used the average heading and speed to calculate the E?tv?s correction initial value, and then filtered the initial value, got the final E?tv?s correction.3. Using the latest release of the EGM2008 global gravity field model as a comparison benchmark, constructed the marine gravity measurement quality checking technique based on the external data source.4. Compared to the DTU10 data set, which is the latest released satellite altimetry gravity data,, built the marine gravity measurement data quality check method.