Terrain Advisory Envelope for Lateral Maneuver Guidance
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Solution Overview
Problem
Current terrain awareness and warning systems (TAWS) do not provide lateral guidance for post-alert terrain avoidance maneuvers, relying solely on vertical climbs to clear obstacles, which may not always be the most efficient path and do not distinguish between current and future terrain threats.
Innovation Solution
A terrain advisory system that includes a processing unit, display unit, and sensor system, which generates a terrain advisory envelope beyond conventional TAWS alerts, providing a graphical representation of potential maneuvers on a map to help pilots decide on the best course of action to avoid terrain hazards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional TAWS systems provide only vertical climb guidance, then the system complexity is reduced and certification risks are minimized, but the terrain avoidance efficiency and path optimization are worsened
Solution Approach 1:
The terrain advisory envelope is segmented into multiple regions (first region for immediate threats, second region for potential future threats) with different graphical representations. This segmentation allows the system to provide differentiated guidance for different threat levels, improving terrain avoidance efficiency while maintaining manageable system complexity through structured information presentation.
Solution Approach 2:
The system extends beyond conventional two-dimensional TAWS alerts by adding a lateral dimension to the advisory envelope. The envelope now provides both vertical climb guidance and lateral turn guidance, creating a three-dimensional maneuver advisory space that optimizes terrain avoidance paths more effectively.
2Productivity
If TAWS systems provide lateral guidance for terrain avoidance, then the terrain avoidance path optimization is improved, but certification risks and system reliability concerns increase
Solution Approach 1:
The system performs preliminary analysis by generating the terrain advisory envelope that identifies optimal lateral and vertical maneuver paths before the pilot executes them. By pre-calculating and presenting multiple guidance options with different graphical representations, the system enables informed decision-making while maintaining pilot authority, thus improving path optimization without compromising certification reliability.
Solution Approach 2:
The terrain advisory envelope acts as an intermediary between the TAWS alert system and the pilot's decision-making process. It translates complex terrain avoidance calculations into intuitive graphical representations that show lateral boundaries and maneuver regions, serving as a communication bridge that enhances path optimization while maintaining system reliability through clear, unambiguous presentation.
3Loss of information
If the terrain advisory envelope extends beyond TAWS lateral boundaries, then the situational awareness and maneuver options are improved, but the information complexity and pilot decision burden increase
Solution Approach 1:
Different regions within the terrain advisory envelope are assigned different graphical qualities and representations. The first region (immediate threats) uses one visual style while the second region (potential future threats) uses another. This local differentiation helps pilots prioritize information and reduces cognitive burden by clearly distinguishing between different threat levels and timeframes.
Solution Approach 2:
The terrain advisory envelope adds lateral dimensionality to the traditional vertical-only TAWS alerts. By extending the envelope laterally beyond TAWS boundaries and incorporating lateral turn guidance, the system provides comprehensive situational awareness in three-dimensional space while organizing information in a structured manner that manages pilot decision complexity.
4Ease of operation
If only vertical climb maneuvers are advised, then the system operation is simplified and pilot training is reduced, but the speed of terrain clearance and maneuver efficiency are worsened
Solution Approach 1:
The terrain advisory envelope dynamically adapts to different aircraft states and threat conditions by providing both vertical and lateral guidance options. The system can adjust the envelope boundaries and graphical representations based on aircraft altitude, speed, and heading, enabling faster terrain clearance when lateral maneuvers are beneficial while maintaining operational simplicity through automated calculations.
Solution Approach 2:
The guidance system combines vertical climb guidance and lateral turn guidance into a unified terrain advisory envelope. This composite approach integrates multiple maneuver types into a single coherent display, allowing pilots to execute faster, more efficient terrain clearance paths that combine both vertical and lateral components while keeping the interface simple and easy to operate.
Data Source
AI summary
A terrain advisory system for an aircraft is disclosed. The terrain advisory system includes a processing unit, a display unit coupled to the processing unit where the display unit displays a map, and a database coupled to the processing unit. The system also includes a sensor system coupled to the processing unit and a terrain awareness and warning system (TAWS) coupled to the processing unit. The TAWS generates cautions and alerts. The processing unit includes a program that generates a terrain advisory envelope extending beyond the distance and lateral envelope within which the TAWS provides cautions and alerts. The terrain advisory envelope is distinguished from TAWS cautions and alerts with a graphical appearance that differs from the graphical appearance of TAWS cautions and alerts.