Aircraft Synthetic Vision System LAAS Data Correction
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Solution Overview
Problem
Aircraft synthetic vision systems (SVS) are limited by the accuracy of topographical databases, particularly in the terminal area of airports, due to unintended errors or biases in runway and obstacle data, which can lead to inaccurate 3D rendered images during precision approaches.
Innovation Solution
The system utilizes ground-based data sources, such as a local area augmentation system (LAAS), to validate and correct topographical database information, ensuring accurate display of runway and obstacle positions and terrain renderings by comparing database data with ground-based information and adjusting the display accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If topographical database information is used for SVS display, then the system can provide 3D rendered images of terrain and obstacles, but the accuracy of runway and obstacle positions may be compromised due to errors or biases in the database
Solution Approach 1:
The system receives actual position information from ground-based augmentation systems (GBAS) about runway and obstacle locations, compares this feedback with the stored topographical database information, and uses the comparison results to correct any errors or biases in the database, thereby improving the accuracy of subsequent SVS displays
Solution Approach 2:
The topographical database automatically corrects its own errors by utilizing actual position information from GBAS. The system performs self-validation and self-correction without requiring external manual intervention, continuously improving its own accuracy through the feedback loop built into the system
2Ease of operation
If the SVS uses published terminal area topographical data, then the system can operate with standard databases, but unintended errors or biases in the data can lead to inaccurate 3D rendered images during precision approaches
Solution Approach 1:
The system changes the positional parameters of topographical features by comparing database coordinates with actual GBAS measurements. When discrepancies are detected, the system adjusts the position, elevation, or other spatial parameters of runways, obstacles, and terrain features to match the more accurate GBAS data, thereby improving manufacturing precision without losing ease of operation
Data Source
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AI summary
An aircraft synthetic vision display system (SVS) includes a topographical database including topographical information relating to an airport, a global positioning system receiver that receives a satellite signal from a global positioning satellite to determine a geographical position of the aircraft, and a ground-based augmentation system receiver that receives a ground-based signal from a ground-based transmitter associated with the airport, wherein the ground-based signal includes geographical information associated with the airport. The SVS further includes a computer processor that retrieves the topographical information from the topographical database based on the geographical position of the aircraft, that retrieves the geographical information associated with the airport, and that corrects the topographical information using the geographical information associated with the airport to generate corrected topographical information. Still further, the SVS includes a display device that renders three-dimensional synthetic imagery of environs of the aircraft based on the corrected topographical information.