Locata-based precise point positioning for kinematic maritime applications

Jiang, Wei; Li, Yong; Rizos, Chris

doi:10.1007/s10291-014-0373-9

Cited by 43 publications

(17 citation statements)

References 10 publications

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“…Appling the SD method, the receiver clock error can be cancelled out completely, however the measurement noise would be increased by a factor of 2 . The receiver noise error is not a bias and can be mitigated by filtering [6]. The unknown variables are the 3D positional parameters, the SD zenith tropospheric error, and the SD carrier phase ambiguities.…”

Section: A Ppp-gnss Technologymentioning

confidence: 99%

“…To satisfy such stringent requirements, a dense network of reference receivers at 50-70 km spacing is typically needed to ensure reliable DGNSS service. The substantial resources for the physical construction and service maintenance mean it is difficult to provide such centimetre-level accuracy positioning across large regions [5,6]. An alternative to the differential positioning techniques is the Precise Point Positioning (PPP) approach, which is based on the processing of observations from a single GNSS receiver only, for PPP there is no longer a need to use corrections and/or measurements from one or more GNSS reference stations.…”

Section: Introductionmentioning

confidence: 99%

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Optimal Data Fusion Algorithm for Navigation Using Triple Integration of PPP-GNSS, INS, and Terrestrial Ranging System

Jiang

Rizos

2015

IEEE Sensors J.

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A good port management system must be able to perform safe, predictable and efficient execution of transport processes. In order to improve the quality of the port management, a robust navigation system is required, which enables to provide the positions of vessels 24/7 on either open or impeded environment. This paper describes a robust georeferencing system that could satisfy centimetre-level accuracy requirements in port environments. The design is based on the loosely-coupled integration of Global Navigation Satellite System (GNSS) technology, a terrestrial radio frequency ranging system known as "Locata", and an inertial navigation system (INS). GNSS observations are processed using the precise point positioning (PPP) approach instead of the conventional differential approach. To satisfy both accuracy and reliability requirements, three integration algorithms -centralised Kalman filtering (CKF), federated Kalman filtering (FKF) and global optimal filtering (GOF) -are investigated and implemented into a "triple-integrated" PPP-GNSS/Locata/INS system. A preliminary performance assessment, which is based on the analysis of real data, concludes that all the three integration algorithms are able to provide centimetre-level positioning solutions. The results show that the FKF and CKF algorithms have similar performance, whereas the GOF solution has higher accuracy. Moreover, outlier simulation is conducted and the result verifies the outlier fault-tolerant capability of the GOF based PPP-GNSS/Locata/INS integrated system.

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Section: A Ppp-gnss Technologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimal Data Fusion Algorithm for Navigation Using Triple Integration of PPP-GNSS, INS, and Terrestrial Ranging System

Jiang

Rizos

2015

IEEE Sensors J.

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“…Fortunately, the pseudolite, which can generate and transit GNSS-like navigation signals [4,5] and has the advantage of flexible placement, low cost, and easy maintenance, is an essential supplement of GNSS and, recently, has been adopted in many areas like precision positioning, timing, and deformation monitoring of bridges [6]. For complex urban canyon environments, the addition of a pseudolite can significantly improve the availability of GNSS-like satellites and enhance the spatial geometry of GNSS [3], which is now a foundation of high-precision GNSS positioning [7][8][9][10]; therefore, the use of a pseudolite with good spatial distribution provides an important technique for high-precise positioning in a constrained environment.…”

Section: Of 16mentioning

confidence: 99%

Precise Point Positioning Algorithm for Pseudolite Combined with GNSS in a Constrained Observation Environment

Sheng

Gan

et al. 2020

Sensors

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In urban canyon environments, Global Navigation Satellite System (GNSS) satellites are heavily obstructed with frequent rise and fall and severe multi-path errors induced by signal reflection, making it difficult to acquire precise, continuous, and reliable positioning information. To meet imperative demands for high-precision positioning of public users in complex environments, like urban canyons, and to solve the problems for GNSS/pseudolite positioning under these circumstances, the Global Navigation Satellite System (GNSS) Precision Point Positioning (PPP) algorithm combined with a pseudolite (PLS) was introduced. The former problems with the pseudolite PPP technique with distributed pseudo-satellites, which relies heavily on known points for initiation and prerequisite for previous high-precision time synchronization, were solved by means of a real-time equivalent clock error estimation algorithm, ambiguity fixing, and validation method. Experiments based on a low-cost receiver were performed, and the results show that in a weak obstructed environment with low-density building where the number of GNSS satellites was greater than seven, the accuracy of pseudolite/GNSS PPP with fixed ambiguity was better than 0.15 m; when there were less than four GNSS satellites in severely obstructed circumstances, it was impossible to obtain position by GNSS alone, but with the support of a pseudolite, the accuracy of PPP was able to be better than 0.3 m. Even without GNSS, the accuracy of PPP could be better than 0.5 m with only four pseudolites. The pseudolite/GNSS PPP algorithm presented in this paper can effectively improve availability with less GNSS or even without GNSS in constrained environments, like urban canyons in cities.

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“…It was able to provide a real-time centimeter-level positioning service using GNSS dual-frequency and multiple-frequency signals for NRTK users in Hong Kong. The Hong Kong GNSS Network RTK Service Platform’s workflow was similar to the workflow of the standard NRTK [ 22 , 23 , 24 , 25 ]. It decodes the original data from the server into code and carrier phase observation and preprocesses them after the satellite positions are calculated with the broadcast ephemeris.…”

Section: Hong Kong Gnss Network Rtk Service Platformmentioning

confidence: 99%

Performance Analysis of GPS/BDS Dual/Triple-Frequency Network RTK in Urban Areas: A Case Study in Hong Kong

Chen

2018

Sensors

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Network Real Time Kinematic (NRTK) positioning with instantaneous ambiguity resolution (AR) is currently one of the most popular techniques for real-time precise positioning using Global Navigation Satellite Systems (GNSS) carrier phase observations. Although NRTK has been successfully applied in many fields in surveying and navigation, the initialization speed, accuracy, and ambiguity successfully fixed rate of NRTK in urban areas (Hong Kong, for instance) would be significantly affected by blocked satellite signals. To address these problems and analyze the performance of GPS/BDS dual/triple-frequency NRTK in urban areas, we developed a new Hong Kong GNSS Network RTK Service Platform. Based on this platform, the performance of NRTK in urban areas was examined through a series of experiments. The results showed that: (1) The initialization time of the NRTK varied with the number of the visible satellite and the quality of the observation. (2) Centimeter-level NRTK service could be provided for users over Hong Kong using the Hong Kong GNSS Network RTK Service Platform. (3) In urban areas, GPS/BDS NRTK services for static, walking, and driving users significantly improved the ambiguity successfully fixed rate of the NRTK service when compared with that using the GPS signal alone. The NRTK ambiguity successfully fixed rate in Hong Kong was better than 99% in good environment. In typical urban environment, the RTK ambiguity successfully fixed rate with GPS/BDS was 33.4–72.4%, which was about 12.7–32.4% with GPS only. (4) BDS triple-frequency observation improved the initialization speed and positioning accuracy of RTK in Hong Kong.

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Locata-based precise point positioning for kinematic maritime applications

Cited by 43 publications

References 10 publications

Optimal Data Fusion Algorithm for Navigation Using Triple Integration of PPP-GNSS, INS, and Terrestrial Ranging System

Optimal Data Fusion Algorithm for Navigation Using Triple Integration of PPP-GNSS, INS, and Terrestrial Ranging System

Precise Point Positioning Algorithm for Pseudolite Combined with GNSS in a Constrained Observation Environment

Performance Analysis of GPS/BDS Dual/Triple-Frequency Network RTK in Urban Areas: A Case Study in Hong Kong

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