Reaserch On The Method Of Quality Control In Processing Airborne Gps Measuring Data

This dissertation is based on the research of the method of quality control in processing airborne GPS measuring data, mainly including ambiguity resolution morbid state question processing, the dynamic cycle slip detection and correction as well as the carrier velocity calculation and so on, the primary content and the achievement of the article is as follows:1.On the foundation of analyzing the GPS primitive observation,the differential observation and their corresponding observational equation , I researched the main erroneous influence that the double difference observation subjected in the dynamic condition, and the solutions, simultaneously calculated and analyzed the nonlinearity of GPS observation model.2.Analyzed the influence of ill-conditioning to the Ambiguity real value,I detected the existence of ill-conditioning problem by using the minimum relative norm method,the characteristic value method,the condition value method and the geometric dilution of precision method; and I introduced the condition index and variance decomposition proportion method that can further fix on the number of multi-collinearity,the contained parameter and their relationship of each multi-collinearity.3.Using the ridge estimation to solve the ill-conditioning problem on the foundation of ill-conditioning detection and analysis, I proposed the improved minimum MSE method through analyzing the ridge trace method,double H formula method and GCV method. The application in ambiguity real value resolution shows improvement to the influence of ill-conditioning and the validity of the method.4.Proposing the method that joint utilizing the ionosphere residual combination and M-W combination to detect and correct cycle slip through the analysis of ionosphere residual method and TurboEdit method , the new method offset the deficiency of two method. In the application of pre-processing data that observed by airborne GPS, the method achieved good effect.5.Analyzing the DIA method,two step Kalman filter method and continual cycle slip testing method that deal with cycle slip based on Kalman filter, which aims at the condition of multi and continual cycle slip in the dynamic situation, I proposed the method based on"Current"Statistics Model and used the Doppler observation to assist the cycle slip identification, simultaneously real-time corrected the error which is suitable for dynamic data processing. Through calculation of the aircraft observed data, the result proved the feasibility and the validity of the new method.6.Analyzing the position difference method, the primitive Doppler observation method and phase time differential method these three kinds of method which is commonly used in velocity calculation. Through the calculation and analysis, it shows the accuracy of different methods and the situation that each method suit to use. Under the condition of considerating the influence of carrier maneuver error to the velocity calculation result, I proposed the method based on"Current"Statistics Model to calculate velocity of the carrier. The result of the accuracy is pretty well as the phase time differential method, better than the fast method comparative analysis the position difference method and the primitive Doppler observation method , because it had considered the carrier maneuver error, which is suitable under the high dynamic condition of application to velocity calculation .