tailieunhanh - Determination of User’s Position Using QZSS/GPS Data

This paper presents study results of standalone positioning, based on GPS/QZSS observations. For this purpose C1 code observations from STK2 station (IGS station in Japan) were used. Computations in RTKLIB software (RTKPOST module) were executed and SPP method was used to position estimation. | VNU Journal of Science: Mathematics – Physics, Vol. 32, No. 3 (2016) 11-18 Determination of User’s Position Using QZSS/GPS Data Le Tien Dung* Vietnam National Satellite Center(VNSC), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam Received 24 June 2016 Revised 25 August 2016; Accepted 09 September 2016 Abstract: This paper presents study results of standalone positioning, based on GPS/QZSS observations. For this purpose C1 code observations from STK2 station (IGS station in Japan) were used. Computations in RTKLIB software (RTKPOST module) were executed and SPP method was used to position estimation. In the paper two experiments were realized: firstly user’s position was estimated based on GPS observations, and in the second case QZSS observations were applied also. Preliminary results of positioning accuracy show that GPS/QZSS solution improve accuracy of X coordinate about m, accuracy of Y coordinate about m and accuracy of Z coordinate about m, respectively. Additionally RMS-3D error was estimated based on coordinate differences from GPS and GPS/QZSS solutions. Average value of RMS-3D term equals to m, with magnitude order between m and m. Keywords: GPS, SPP Method. QZSS-Zenith 1. Introduction Quasi-Zenith Satellite System (QZSS-Zenith) is a regional positioning system which was built by Satellite Positioning Research and Application Center – SPAC, foundation of Japanese Government [1]. In primary conceptions, QZSS system had assured coverage over Eastern Asia and Australia with Oceania. The MGEX campaign underlines possibility of utilization QZSS signals also in Central Europe [2]. Major principles of the system were development around to 3 functions: positioning accuracy improvement, positioning available time improvement, and transmit short information about emergency warnings, such as disaster or crisis time [3-5]. QZSS system divides into 3 components: Space Segment (SS),