항해용 위성항법 보정정보의 오차 해석

Abstract

To achieve the accurate DGPS positioning, DGPS reference receiver should have capability to minimize the error of corrections, such as pseudorange correction and pseudorange rate correction. The reason is that the DGPS corrections generated by DGPS reference receiver include the error of raw measurements, which is one of the non-common errors incapable of elimination on differential technique. Therefore in order to improve the DGPS position accuracy and develop the UDRE estimation algorithm, which is used to forecast the DGPS position accuracy of vessel, it is necessary to study the error analysis of DGPS corrections for maritime navigation. This paper carries out the survey on the previous studies to analyze the DGPS correction error. And it is found that the previous studies have the weak points not to present the type 2 model and type 3 model of correction error. This paper analyses the sources of correction error by the latency time and raw measurement data for modeling the type 2 and type 3 correction errors. And the type 2 model and type 3 model of correction error are proposed using the analysis results and curve fitting method. Finally in this paper, the proposed models are verified by comparison with real DGPS positioning error.