A Fault Detection and Isolation Design for a Dual Pitot Tube Air Data System

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We design a fault detection and isolation algorithm using the integrated navigation system approach for detecting and potentially isolating a single Pitot tube failure in the safety-critical air data system used in Unmanned Aerial System (UAS). The design requires two Pitot tubes, one Inertial Measurement Unit (IMU), and a GNSS receiver. The algorithm utilizes two identical synthetic air data systems (SADS) as the bases for estimation. Each SADS works independently with a Pitot tube while sharing the IMU and the Global Navigation Satellite Systems (GNSS) receiver. The detection capability is achieved using residual thresholding techniques, and the isolation functionality is obtained via simple decision logic. This air data fault detection algorithm is designed to meet the integrity and continuity requirements. Both innovation-based and residual-based test statistics using various sliding window sizes are compared to see their effectiveness. A mathematical derivation is presented to show the relationship between the residual-based test and the observability matrix. A new Minimal Detectable Error (MDE) of the airspeed Va is developed, and protection level calculations for the angle-of-attack a and sideslip ß are derived. A simulation is presented to showcase the air data fault detection and isolation algorithm. Specifically, the impact of the external disturbance, the motion of the dynamics and the airspeed fault on a and ß state errors, and the detection capability are discussed. Furthermore, the protection levels of a and ß are illustrated.

Original languageEnglish (US)
Title of host publication2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages62-73
Number of pages12
ISBN (Electronic)9781728102443
DOIs
StatePublished - Apr 2020
Event2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020 - Portland, United States
Duration: Apr 20 2020Apr 23 2020

Publication series

Name2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020

Conference

Conference2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020
CountryUnited States
CityPortland
Period4/20/204/23/20

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  • Cite this

    Sun, K., & Gebre-Egziabher, D. (2020). A Fault Detection and Isolation Design for a Dual Pitot Tube Air Data System. In 2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020 (pp. 62-73). [9110179] (2020 IEEE/ION Position, Location and Navigation Symposium, PLANS 2020). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/PLANS46316.2020.9110179