Positioning and integrity monitoring using the new DFMC SBAS service in the road transport
MetadataShow full item record
Australia and New Zealand has initiated a two-year test-bed in 2017 for the new generation of Satellite-Based Augmentation System (SBAS). In addition to the legacy L1 service, the test-bed broadcasts SBAS messages through L5 to support the dual-frequency multi-constellation (DFMC) service for GPS and Galileo. Furthermore, PPP corrections were also sent via L1 and L5 to support the PPP service for dual-frequency GPS users and GPS/Galileo users, respectively.
The positioning and integrity monitoring process are currently defined for the aeronautical DFMC SBAS service in . For land applications in road transport, users may encounter problems in complicated measurement environments like urban areas, e.g., more complicated multipath effects and frequent filter initializations of the carrier-smoothed code observations. In this study, a new weighting model related to the elevation angles, the signal-to-noise ratios (SNRs) and the filter smoothing time is developed. The weighting coefficients adjusting the impacts of these factors are studied for the open-sky, the suburban and the urban scenarios. Applying the corresponding weighting models, the overbounding cumulative distribution functions (CDFs) of the weighted noise/biases are searched and proposed for these scenarios.
Using real data collected under different measurement scenarios mentioned above, the DFMC SBAS positioning errors and protection levels are computed in the horizontal direction based on the proposed weighting models and the proposed overbounding CDFs. The results are compared with the case applying only the traditional elevation-dependent weighting model. While the positioning accuracy and protection levels did not change much for the open-sky scenario, the RMS of the positioning errors and the average protection levels are found to be reduced in both the suburban and urban scenarios.
 EUROCAE (2019) Minimum operational performance standard for Galileo/global positioning system/satellite-based augmentation system airborne equipment. The European Organisation for civil aviation equipment, ED-259, February 2019
Showing items related by title, author, creator and subject.
SBAS DFMC service for road transport: positioning and integrity monitoring with a new weighting modelWang, Kan ; El-Mowafy, Ahmed ; Rizos, Chris; Wang, Jinling (2021)In 2017, the new generation satellite-based augmentation system (SBAS) test-bed was initiated by Australia and New Zealand, which supports the dual-frequency multi-constellation (DFMC) positioning with both GPS and Galileo ...
Assessment of the New DFMC and PPP services of the second-generation SBAS in the Mining and Urban environmentsWang, Kan ; El-Mowafy, Ahmed ; Khaki, Mehdi; Sutherland, Troy; Rubinov, Eldar (2020)In 2017, a two-year test-bed for a second generation Satellite-Based Augmentation System (SBAS) was initiated in Australia and New Zealand in preparation for building an operational system. In addition to the traditional ...
Second Generation SBAS – Performance Analysis and Bridging Positioning and Integrity Monitoring during SBAS Outages in the Urban EnvironmentEl-Mowafy, Ahmed ; Wang, Kan (2019)Improved SBAS is expected to be a primary positioning method for many land applications such as Intelligent Transport Systems (ITS). In 2017, a second-generation SBAS test-bed was initiated in Australia and New-Zealand ...