Offset Approach Lateral Deviation Symbology Display
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Solution Overview
Problem
Current aircraft navigation systems, particularly those using Instrument Landing Systems (ILS), face challenges in accurately displaying lateral deviation symbology for offset approaches, as the misalignment between the runway centerline and ILS approach line complicates the visualization on high-resolution displays, leading to insufficient accuracy and resolution for flight crews.
Innovation Solution
A graphical display system for aircraft that includes a processor for real-time computations to generate conformal perspective views of the aircraft's position relative to both the ILS approach line and the extended runway centerline, along with a runway assistance landing system receiver and position sensors, to provide accurate lateral deviation symbology and notify flight crews of offset approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If published bearing numbers and ILS signals are used for offset approaches, then the system is simple to operate, but the display accuracy and resolution are insufficient for properly displaying the approach line over an extended range
Solution Approach 1:
The patent introduces an intermediary computational system that processes published bearing numbers and ILS signals through real-time mathematical computations to generate high-resolution approach line displays. This intermediary layer transforms simple input data into precise visual guidance without requiring complex hardware modifications to the underlying navigation systems.
Solution Approach 2:
The patent transitions from two-dimensional symbolic displays to three-dimensional conformal perspective views that accurately represent the offset approach geometry. By adding the dimensional aspect of vertical perspective and spatial depth, the system achieves higher display accuracy while maintaining operational simplicity through intuitive visual representation.
2Loss of information
If flight crews are provided with basic ILS signals, then the system is easy to operate, but flight crews cannot be adequately informed of the offset approach existence and transition point location
Solution Approach 1:
The patent segments the approach information display into distinct components: approach line visualization, transition point identification, and runway centerline alignment cues. By dividing the information presentation into manageable segments, the system provides complete information without overwhelming the flight crew, maintaining operational simplicity through organized information delivery.
Solution Approach 2:
The patent utilizes color-coded symbology to convey different aspects of offset approach information. Different colors indicate the approach line, transition point, and alignment status, allowing flight crews to quickly comprehend complex spatial relationships and operational requirements without increasing system complexity.
3Measurement precision
If a single lateral deviation symbology is used, then the display is simple, but it cannot accurately represent position relative to both approach line and runway centerline
Solution Approach 1:
The patent merges multiple lateral deviation measurements into a unified conformal perspective display that simultaneously shows position relative to both the approach line and runway centerline. By combining these reference systems in a single integrated visual field, the patent achieves high position accuracy without creating separate complex display systems.
Solution Approach 2:
The conformal perspective display serves multiple functions simultaneously: it displays approach line alignment, transition point location, runway centerline alignment, and lateral deviation information. This multi-functional display reduces the need for multiple separate systems while maintaining high measurement precision for all parameters.
Data Source
AI summary
Systems and methods to accurately display lateral deviation symbology in offset approaches to runways is provided. A system for on-aircraft display of lateral deviation symbology for use in offset approaches comprises means for generating a conformal video display representation of an aircraft's current position, means for notifying a flight crew of the existence of an offset approach, means for displaying an extended runway center line, and means for displaying an approach line.