2/24/2023 0 Comments Terrestrial air navigationThe consistency between the SPP and DGPS mode was about 1 m (RMS) in latitude and longitude, and 2 m (RMS) in height, with instantaneous errors of up to a few meters. The accuracy of aircraft positioning using the SPP code method was referred to the DGPS solution. The position of the aircraft was determined using GPS observations in the SPP code method. The articles describe the results of the aerial test performed in Florida, USA, in 1994. Studies on aircraft positioning accuracy using the SPP code method have been conducted worldwide in aeronautical experiments and described in scientific papers. On the other hand, in the differential RTK-OTF solution, the reference position of the aircraft is determined using phase observations in real time. In the differential DD solution, the reference position of the aircraft is determined by means of phase observations in the post-processing mode. Within the DGPS differential technique, the aircraft position is determined using code differential corrections, transmitted from the GNSS reference station to a mobile receiver, mounted on board an aircraft. In air navigation, the positioning accuracy of the SPP method is designated in relation to the reference solution based on the differential DGPS (differential GPS) technique, the differential DD (double difference) technique or the RTK-OTF (real time kinematic-on the fly) differential technique. The SPP code method has been repeatedly used in flight tests in order to determine the accuracy of aircraft positioning by means of the GPS satellite system. The SPP method used in the air navigation system utilizes absolute positioning using code observations. The proposed approach is therefore of practical application in air navigation to improve the quality of aircraft positioning. On the basis of the obtained results, it was found that the RMS (Root Mean Square) accuracy of positioning for XYZ geocentric coordinates was better than 1.2% to 33.7% for the weighted average method compared to a single GPS SPP solution. The calculations were made using navigation data recorded by two independent GPS receivers: Thales Mobile Mapper and Topcon HiPerPro. In this research, measurement weights were used as a function of the number of GPS satellites being tracked, and geometric PDOP (Position Dilution of Precision) coefficient. The paper developed a concept of using the weighted average model with the use of measuring weights to improve the quality of determination of the coordinates and accuracy of GPS SPP positioning. The paper describes and presents a new calculation strategy for the determination of the aircraft’s resultant position using the GPS (Global Positioning System) SPP (Single Point Positioning) code method.
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