Improved downward-looking terrain database integrity monitor and terrain navigation

Vadlamani, A.; Haag, Maarten Uijt de

doi:10.1109/aero.2004.1367934

Cited by 10 publications

(12 citation statements)

References 4 publications

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“…This paper is an extension of work previously done by Ohio University and presented in [14][15][16][17]. Although the basic concepts introduced in those works are summarized here, the reader is referred to those works for an extensive treatment as well as various other flight test results.…”

Section: Prior Work and Current Effortmentioning

confidence: 96%

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Terrain Elevation Data Integrity Monitor and Referenced Navigation

Vadlamani

Haag

2009

Journal of Aerospace Computing, Information, and Communication

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Synthetic vision systems provide a synthesized view of the outside world to pilots on displays in the flight deck. Terrain databases onboard aircraft are used as the source of terrain elevation information on synthetic vision system displays. Because the primary function of these displays is to improve flight safety, it is imperative that the terrain data used to generate the imagery conform to a high level of integrity. Otherwise, instead of preventing accidents, the terrain database would be cause of more. Hence, it is necessary to include an integrity monitor function that ensures the terrain data are consistent with the real world. In this paper, we revisit previously proposed concepts and present the development of a 3D spatial data integrity monitor. The framework is also extended to a terrain referenced navigation scheme such that both operations can be performed simultaneously. Presented furthermore is a Kalman filter design and its associated tradeoffs for improving the performance of the integrity monitor and navigation functions. The performance of the integrity monitor and position estimator for navigation is evaluated using flight test data collected in the vicinity of Braxton County airport in West Virginia.

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Section: Prior Work and Current Effortmentioning

confidence: 96%

“…Given the threshold value, T th , and the probability of missed detection, P MD , a corresponding noncentrality parameter, λ B , can be computed for the faulted PDF (H 1 ) [16]. Now, the minimum detectable bias μ B can be computed from λ B as follows [6,19]:…”

Section: A Formulation Of Hypothesesmentioning

confidence: 99%

Terrain Elevation Data Integrity Monitor and Referenced Navigation

Vadlamani

Haag

2009

Journal of Aerospace Computing, Information, and Communication

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“…Determining the integrity of a terrain elevation database by monitoring the consistency between differential GPS (DGPS) vertical position solution and an altitude measurement was conceived and evaluated in [6]. Altimeter use as an integrity monitor for terrain referenced navigation was evaluated in [7].…”

Section: Contentsmentioning

confidence: 99%

GPS III-Galileo/Altimeter Landing System for CAT IIIB: Concept and Analysis

Braff

2008

Navigation

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This paper contains a description and analysis of the performance of a future Global Navigation Satellite System (GNSS)/altimeter integration that is shown to have potential to provide the sensor accuracy and integrity needed for Category IIIB approaches. The concept takes advantage of independent position estimates to provide integrity and enhanced accuracy. The GNSS component is GPS III and Galileo, implying a circa 2020 time frame. The altimeter component is radar (or laser) with terrain elevation corrections. A feature of the concept is a method that adjusts sensor weights to achieve required integrity risk regardless of the magnitude of a fault error. The analysis focuses on sensor integrity and accuracy, and includes risk analysis, derivation of system parameters, and availability estimates with respect to CONUS.

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“…This paper is an extension of work done previously in [4] and [5] and although they are summarized here, the reader is referred to those works for a more extensive treatment. The organization of the paper is as follows: The need for statistical characterization of DEM errors for integrity monitoring is discussed followed by the introduction of the concept of a 'space envelope'.…”

Section: Introductionmentioning

confidence: 96%