[논문]Multi-GNSS Standard Point Positioning using GPS, GLONASS, BeiDou and QZSS Measurements Recorded at MKPO Reference Station in South Korea

Choi, Byung-Kyu; Cho, Chang-Hyun; Cho, Jung Ho; Lee, Sang Jeong

doi:10.11003/jpnt.2015.4.4.205

Multi-GNSS Standard Point Positioning using GPS, GLONASS, BeiDou and QZSS Measurements Recorded at MKPO Reference Station in South Korea 원문보기

Journal of Positioning, Navigation, and Timing, v.4 no.4, 2015년, pp.205 - 211

Choi, Byung-Kyu (Space Science Division, Korea Astronomy and Space Science Institute) , Cho, Chang-Hyun (Space Science Division, Korea Astronomy and Space Science Institute) , Cho, Jung Ho (Space Science Division, Korea Astronomy and Space Science Institute) , Lee, Sang Jeong (Department of Electronics Engineering, Chungnam National University)

Abstract ▼ AI-Helper

The Global Navigation Satellite System (GNSS) is undergoing dramatic changes. Nowadays, much more satellites are transmitting navigation data at more frequencies. A multi-GNSS analysis is performed to improve the positioning accuracy by processing combined observations from different GNSS. The multi-GNSS technique can improve significantly the positioning accuracy. In this paper, we present a combined Global Positioning System (GPS), the GLObal NAvigation Satellite System (GLONASS), the China Satellite Navigation System (BeiDou), and the Quasi-Zenith Satellite System (QZSS) standard point positioning (SPP) method to exploit all currently available GNSS observations at Mokpo (MKPO) station in South Korea. We also investigate the multi-GNSS data recorded at MKPO reference station. The positioning accuracy is compared with several combinations of the satellite systems. Because of the different frequencies and signal structure of the different GNSS, intersystem biases (ISB) parameters for code observations have to be estimated together with receiver clocks in multi-GNSS SPP. We also present GPS/GLONASS and GPS/BeiDou ISB values estimated by the daily average.

주제어

AI 본문요약
AI-Helper

제안 방법

In this study, GPS L1 C/A (Coarse/Acquisition) code, GLONASS L1 code, BeiDou B1 code, and QZSS L1 code were used to process the GPS, GLONASS, BeiDou, and QZSS observations. Eq.

이론/모형

The position errors depending on time were presented as the east, north, and up direction components. The absolute position for the position error was obtained based on the static precise point positioning (PPP) method using the GNSS software developed by the Korea Astronomy and Space Science Institute. As shown in Fig.
To estimate the position, receiver clock error, and the intersystem bias, the weighted least squares method was employed as Eq. (3) (Tarrío et al.

성능/효과

In this study, the Klobuchar model that is used for GPS was utilized to calculate ionospheric delay error, and the ionospheric delay values depending on the frequency of the GNSS satellite was calculated and applied as shown in Eq. (2) based on the fact that ionospheric delay error is inversely proportional to the square of the strength of frequency.
As shown in Fig. 2, the average values of the daily position errors calculated by the GPS+GLO+BDS+QZS combined positioning were 0.29 m, 0.47 m, and -0.74 m in the east, north, and up directions, respectively. Also, the average position errors in the horizontal directions (east and north) were smaller than that in the vertical direction (up).
As shown in Fig. 3, all the horizontal position errors of the GPS+GLO+BDS+QZS combined positioning were smaller than those of the GPS-only positioning. In particular, the position error in the north direction decreased further compared to the horizontal components.
In Fig. 3, the horizontal axis represents the position error in the east direction, the vertical axis represents the position error in the north direction, and the yellow cross represents the absolute position (0, 0). The horizontal position errors of GPS were expressed as blue circles, and those of GPS+GLO+BDS+QZS were expressed as red stars.
The analysis of the position errors indicated that the ‘GPS+GLO’ combination had relatively larger position errors compared to other combinations, while the ‘GPS+GLO+BDS+QZS’ combination had smaller position errors. Based on this study, it is noted that the combination of many navigation satellites observed at the MKPO station in South Korea affects the position accuracy of users as well as an increase of visible satellites.
In addition, the ISB among different navigation systems was estimated, where the daily averaged ISB values for GPS/GLO and GPS/BDS were -322.21 ns and 39.83 ns, respectively. In addition, the averaged absolute GPS/GLO ISB was larger than GPS/BDS ISB.
83 ns, respectively. In addition, the averaged absolute GPS/GLO ISB was larger than GPS/BDS ISB.
The analysis of the position errors indicated that the ‘GPS+GLO’ combination had relatively larger position errors compared to other combinations, while the ‘GPS+GLO+BDS+QZS’ combination had smaller position errors
The analysis of the position precision in the various combinations indicated that the ‘GPS+GLO’ combination showed relatively lower position precision compared to the other combinations, while the ‘GPS+GLO+BDS+QZS’ combination showed higher position precision.
To compare the position accuracy performance, data processing was performed based on a total of five combinations: ‘GPS-only’, ‘GPS+BDS’, ‘GPS+GLO’, ‘GPS+GLO+BDS’, and ‘GPS+GLO+BDS+QZS’

참고문헌 (15)

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상세보기
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상세보기
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원문보기 상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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