An evaluation of precise point positioning using QZSS LEX signal in Vietnam

Hoang-Van, Hiep; Thanh, Tu Nguyen Thi

doi:10.1109/nics.2016.7725657

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…In order to ensure the consistency of terminals, this kind of satellite sys-tem tends to use the same frequency points and modulation modes as the GNSS, and its information rates are also consistent with the corresponding GNSS. Typical instances of this method include the WAAS [4,5] of the United States, the European EGNOS system [6], the Japanese MSAS [7,8], Japanese LEX signal [9,10], the Indian GAGAN system [11][12][13], and the Russian SDCM system [14]. Therefore, these systems usually have a lower information rate, which is generally 250 bps.…”

Section: Introductionmentioning

confidence: 99%

Satellite Navigation and Communication Integration Based on Correlation Domain Indefinite Pulse Position Modulation Signal

Zou

2021

Wireless Communications and Mobile Computing

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Ubiquitous signal coverage is a basic demand of Internet of Things (IoT) communications, which meets the feature of satellite communications. Infinite user number is a basic demand of IoT location-based services, which meets the feature of Global Navigation Satellite System (GNSS). Both of these demands make Satellite Navigation and Communication Integration (SNCI) an important supporting technology for IoT. Inherited from the satellite communications system, GNSS itself has a certain data transmission capacity. Thus, enhancing the communication function of the GNSS is a promising means of achieving SNCI. Considering that a unified signal system cannot currently realize high-precision positioning and high-speed data transmission simultaneously in SNCI, this project proposes a Correlation Domain Indefinite Pulse Position Modulation (CDIPPM). A pilot channel and a data channel are introduced in this technology, which are distinguished by Code Division Multiplexing (CDMA). The synchronization function is provided by the pilot channel, thereby freeing the data channel of this function. The phase of the pseudorandom code can then be used as the carrier of information. In order to transmit more information, the transmitter of the proposed technology superimposes on the data channel multiple sets of spread spectrum sequence, which are generated from one set of spread spectrum sequence by different cyclic shifting operations. The receiver will identify the number and location of the correlation function peaks by a detection algorithm and recover the message. It can be seen by theoretical analysis and simulation verification. The technology can significantly improve satellite data transmission rates and maintain the original positioning function while minimizing change in the original GNSS signal. Therefore, the SNCI system based on this technology has the following advantages: a unified signal system, high positioning accuracy, high data transmission rate, and a backward navigation function, and it is easy to promote.

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Section: Introductionmentioning

confidence: 99%

Satellite Navigation and Communication Integration Based on Correlation Domain Indefinite Pulse Position Modulation Signal

Zou

2021

Wireless Communications and Mobile Computing

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“…MADOCA-LEX's precise point positioning (PPP) performance has been evaluated in different countries such as Australia [10], New Zealand [11], Philippines [12], and Vietnam [13], and tested in different precise point positioning application such as robotic [14], transportation [12], and precise farming [15], In these studies, utilization of said technology had been exploited. The demand for low-cost receivers that can achieve high precision and accuracy continues to rise.…”

Section: Introductionmentioning

confidence: 99%

“…Some studies [13,20] have developed an algorithm to decode the MADOCA-LEX message due to the unavailability of receivers that can automatically process said signal during that time of the experimentations. Nowadays, there are new receivers that support QZSS and decode the LEX signal to use the correction information [21].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Low-Cost and Real-Time Multi-GNSS Advanced Demonstration Tool for Orbit and Clock Analysis-Precise Point Positioning (MADOCA-PPP) Receiver Systems

Fredeluces

Lagura²,

Reyes

et al. 2020

AJET

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With Multi-GNSS Advanced Demonstration Tool for Orbit and Clock Analysis (MADOCA), a software estimator of precise satellite information, by JAXA, u-blox C099 ZED-F9P and MSJ-3008-GM4-QZS using MADOCA-PPP can be exploited in GNSS applications that require sub-decimeter accuracy without being costly. To evaluate their performance, convergence time and accuracy of solutions are compared to Trimble NetR9, a survey-grade receiver. Post-processed PPP solutions of ZED-F9P were computed using RTKLIB and real-time PPP was provided by the MSJ-3008-GM4-QZS. Results showed ZED-F9P achieved an RMS of 5.28 cm, 2.89 cm, and 9.55 cm in East, North, and Up directions. This means ZED-F9P can be used in applications requiring below 10 cm accuracy even without base station. MSJ-3008-GM4-QZS obtained an RMS of 10.45 cm, 6.27 cm, and 27.56 cm in the same directions. Unlike ZED-F9P, it achieved above 10 cm accuracy in North and Up directions which is due to large errors from cycle slips and jumps in observations. Interestingly, no fixed solutions were achieved between the 20:00 to 21:00 UTC period, although said receiver was able to receive corrections. However, if the observations after 20:00 UTC were removed, the MSJ-3008-GM4-QZS improved to 7.17 cm, 3.58 cm, and 22.32 cm in the same directions.

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Evaluation of QZSS orbit and clock products for real-time positioning applications

Bramanto

Gumilar

2022

Journal of Applied Geodesy

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The Quasi-Zenith Satellite System (QZSS) is the recent Japanese satellite positioning system to enhance the positioning accuracy in Japan’s urban areas. Additionally, they provide precise orbit and clock corrections and can be obtained through their experimental signals (LEX), streaming access, and published site. Multi-GNSS Advanced Demonstration tool for Orbit and Clock Analysis (MADOCA) is one of the precise products offered in QZSS services that can be obtained on a global scale. In this study, we evaluated the performance of MADOCA orbit and clock corrections, particularly for real-time positioning applications using LEX signals. Based on the simulation, we predict that 16 countries in the East Asia and Oceania regions will gain the maximum benefit of the LEX signals. However, we stress that one may have difficulties decoding the LEX signals at regions where only one QZSS satellite is observed. During our sailing expedition at Sumatran Sea, we could only decode up to 37 % LEX signals for the observation period. It profoundly increased up to 95 % at Sulawesi Strait where at least three QZSS satellites with an elevation angle of, at its minimum, 40° were observed. The orbit and clock accuracy is estimated to be 5.2 cm and 0.6 ns with respect to International GNSS Service (IGS) final products. Our simulation of using the Real-Time Precise Point Positioning (RTPPP) method revealed that the accuracy of the corresponding positioning applications was less than one decimeter. Further, we compared the MADOCA products for RTPPP applications with Apex5 positioning solutions in static field observations. The positioning accuracy for MADOCA-RTPPP during the field observations was estimated to be centimeter to decimeter level and is slightly worse than Apex5 positioning solutions. Nevertheless, we highlight vast positioning applications using MADOCA-RTPPP, e. g., survey and mapping, smart agriculture, and offshore engineering navigation.

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An evaluation of precise point positioning using QZSS LEX signal in Vietnam

Cited by 4 publications

References 5 publications

Satellite Navigation and Communication Integration Based on Correlation Domain Indefinite Pulse Position Modulation Signal

Satellite Navigation and Communication Integration Based on Correlation Domain Indefinite Pulse Position Modulation Signal

Performance Evaluation of Low-Cost and Real-Time Multi-GNSS Advanced Demonstration Tool for Orbit and Clock Analysis-Precise Point Positioning (MADOCA-PPP) Receiver Systems

Evaluation of QZSS orbit and clock products for real-time positioning applications

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