Ground‐Based Augmentation System

Pervan, Boris

doi:10.1002/9781119458449.ch12

Cited by 3 publications

(2 citation statements)

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“…Subtype ID 7 provides a quality indicator for the user range accuracy (URA) of each satellite, and others provide a troposphere quality indicator as well as an SSR slant total electron content (STEC) quality indicator. The quality indicator is represented by a combination of CLASS and VALUE, the values of which range from 0 to 7, as seen in Equation (1). The SSR URA and tropospheric quality indicators were converted to a physical quantity using the following Equation [21]:…”

Section: Overview Of the Clas Broadcast Messagesmentioning

confidence: 99%

“…The performance of the global navigation satellite system (GNSS) is enhanced by differential GNSS techniques, including ground-and space-based augmentation systems (GBAS and SBAS) of the global positioning system (GPS) [1,2]. The GBAS and SBAS were primarily developed to guide aircraft navigation, and their design approach and operational philosophies centered on system safety.…”

Section: Introductionmentioning

confidence: 99%

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Fault-Free Protection Level Equation for CLAS PPP-RTK and Experimental Evaluations

Kim

Song

Shin

et al. 2022

Sensors

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Centimeter level augmentation system (CLAS) of the quasi-zenith satellite system (QZSS) is the first precise point positioning-real time kinematic (PPP-RTK) augmentation system of the global navigation satellite system (GNSS), which is currently providing services for Japan. CLAS broadcasts the state-space representation of correction messages along with integrity messages regarding satellite faults and the quality index of each correction. In other GNSS augmentation systems, such as the space-based augmentation system (SBAS) of GNSS, the quality indices of correction messages are used to generate fault-free protection levels that represent a position bound containing a true user position with a probability of missed detections. Although the protection level equations are well defined for the SBAS, a protection level equation for the CLAS PPP-RTK service has not been rigorously discussed in the literature. This paper proposes a fault-free protection level equation for the PPP-RTK methods that considers the probability of correct integer ambiguity fixes in the GNSS carrier phase measurements as well as the CLAS correction quality messages. The computed protection levels with position errors were experimentally compared by processing the GNSS measurements from the GNSS Earth Observation Network (GEONET) stations in Japan and the L6 messages from the CLAS broadcast using the virtual reference station-real time kinematic (VRS-RTK) techniques. Our results, based on the GEONET dataset spanning 7 days, showed that the computed protection levels using the proposed equations were larger than the position errors for all epochs. In the dataset, the RMS errors of the CLAS VRS-RTK position were 4.6 and 14 cm in the horizontal and vertical directions, respectively, whereas the horizontal protection levels ranged from 25 cm to 2.3 m and the vertical protection levels ranged from 50 cm to 5.2 m based on fault-free integrity risk of 10−7.

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Section: Overview Of the Clas Broadcast Messagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%