Improving instantaneous height quality of transducer in precise bathymetric measurement based on multi-information fusion

Tide-independent precise underwater topographic surveying technique is widely used in inshore hydrographic measurement. GPS RTK provides an accurate instantaneous height to transducer in the technique. However the instantaneous height easily suffers the influences of satellite status, vessel attitude and radio transmission and so on and becomes weak in quality. The low-quality instantaneous height influences seriously the accuracy of vertical solution in final underwater topographic result. Thus it is necessary to study quality control of the instantaneous height. Kalman filter is valid for filtering a small quantity of abnormal height records. However it brings easily filtering radiation when continuous or large quantity of abnormal height records appear in the instantaneous height series. In order to ensure the accuracy of tide-independent underwater topographic measurement, A new method, which based on multi-information fusion, is studied for improving the instantaneous height quality of transducer in the paper.