Application In Bathymetric Survey Without Tide Observation Based On BDS/GPS Dual Frequency Differential Beacon

With development and improvement of the global GNSS satellite navigation and positioning technology, At present, when we measure the water depth in the Yangtze river channel, due to the effect of some factors, it is difficult to select effective ways in the Yangtze river channel to check the non-tidal depth measurement. With the built of CLJ BDS/GPS dual frequency differential beacon system, it’s provided a new measurement method for the Yangtze River Waterway non-tidal deep measurements. This paper is based on the research of CLJ BDS/GPS dual frequency differential beacon systems. It will be applied to deep non-tidal measurement. The main research work and conclusions are as follows:(1) The basis of multi-constellation GNSS positioning is elaborated. BDS/GPS’s constellation structure, the signal characteristics, the coordinate system and the system is analyzed and compared. The traditional pseudo-range and carrier differential positioning model and the characteristics of the observed value combined model are analyzed. The basic principles of non-tidal depth measurements and tide with traditional manual methods were analyzed and the error is compared.(2) BDS/GPS dual frequency differential beacon is the first area of the Yangtze River Waterway BDS/GPS differential beacon. The principle of differential positioning beacon is described. The composition and its key technologies BDS/GPS dual frequency differential beacon system are introduced in detail. Three test points are used to test plane positioning accuracy. The test results show that its plane positioning accuracy was better than 1m, its Signal is coverage of 300km The beacon differential high speed dynamic positioning performance is tested in the highly dynamic environment. The test results show that the flat-screen error is still able to meet the plane positioning accuracy better than lm. So CLJ BDS/GPS dual frequency differential beacon is able to meet the accuracy of non-tidal depth measurement’s plane positioning.(3) Later use of high-precision long baseline solver way can provide superior than 10cm for non-Tidal deep measurement’s height datum. In the data preprocessing stage, the BDS/GPS dual system of space-time unity and cycle slip detection are analyzed. The robust adaptive Kalman filter principle is introduced. And verified by experiment the robust adaptive Kalman filtering reliability. For the actual situation, a tropospheric delay error and taking into account the length of the baseline solution method is presented. The results show that:by the way of static data is simulated to dynamic process, its elevation positioning accuracy is able to achieve better than 10cm of height positioning accuracy. So taking advantage of the proposed long afterwards baseline solution in a manner can satisfies the deep measurement without tidal elevation positioning accuracy.(4) Non-tidal deep measurement system based on BDS/GPS dual frequency differential beacons is constructed. Firstly beacon provides flat-screen positioning accuracy, re-use afterwards baseline data processing method provides elevation positioning accuracy. The system of outside the industry measurement equipment, measurement methods and data processing within the industry is introduced. The system is capable of measuring non-tidal deep within the CLJ BDS/GPS dual frequency differential beacon signal coverage 250km range. Bathymetry currently Yangtze inland waterway provides a new measurement.