Temperature-Compensated Altitude for Digital Terminal Charts
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Solution Overview
Problem
Current terminal area procedure charts do not account for temperature variations from standard atmospheric conditions, leading to potential safety issues due to inadequate altitude clearance in non-standard weather conditions.
Innovation Solution
The system generates temperature-compensated altitude values by calculating corrections based on the deviation from International Standard Atmosphere (ISA) temperatures, allowing for accurate altitude adjustments in digital terminal area procedure charts displayed on aircraft cockpit systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature compensation calculations are implemented in the cockpit display system, then flight safety is improved through accurate altitude clearance, but device complexity increases due to additional processing requirements
Solution Approach 1:
The system pre-calculates and stores temperature compensation values in lookup tables during system initialization or offline processing. When operating, the cockpit display system simply retrieves pre-computed compensation values based on current temperature readings, avoiding complex real-time calculations and reducing processing complexity while maintaining safety.
Solution Approach 2:
The patent introduces an intermediary compensation module that sits between the temperature sensor and the altitude display. This module handles all temperature compensation calculations and presents corrected altitude values to the display system, isolating the complexity from the main flight display architecture and simplifying integration.
2Measurement precision
If temperature compensated altitude values are calculated and displayed, then measurement precision of altitude clearance is improved, but loss of time occurs due to additional calculation processing
Solution Approach 1:
Temperature compensation values and correction algorithms are pre-computed and stored in lookup tables before flight operations. During actual use, the system performs rapid table lookups based on current temperature readings rather than performing complex real-time calculations, achieving both high precision and fast response.
Solution Approach 2:
The system implements temperature compensation only when temperature deviations from standard atmosphere exceed predefined thresholds. For normal temperature conditions, standard altitude values are displayed without compensation, reducing unnecessary processing time while maintaining precision when it matters most.
3Reliability
If temperature compensation is applied to all altitude values on procedure charts, then reliability of obstacle clearance is improved, but device complexity increases due to comprehensive data processing
Solution Approach 1:
The system applies temperature compensation selectively to specific altitude values on procedure charts based on their relevance to obstacle clearance. Critical altitudes such as minimum safe altitudes, obstacle clearance altitudes, and transition altitudes receive compensation, while less critical values may use standard values, reducing overall processing complexity while maintaining safety.
Solution Approach 2:
The system pre-identifies and flags critical altitude values on procedure charts that require temperature compensation. During operation, only these pre-identified critical values undergo compensation processing, rather than processing all altitude values uniformly, reducing data processing complexity while ensuring safety-critical values are accurate.
Data Source
AI summary
Methods and systems of generating a data driven digital chart. The methods and systems include retrieving a data driven chart for a requested terminal area procedure chart from a database of data driven charts. The data driven charts describe digital terminal area procedure charts by way of data elements for each terminal area procedure chart including geodetic straights, arcs, text elements and symbols defined with respect to location. Some of the data elements are further defined with respect to altitude values assuming a standard atmospheric temperature value. The systems and methods include calculating compensated altitude values for the data elements of the retrieved data driven chart based on a deviation between the outside air temperature value and the standard atmospheric temperature value. The methods and systems include generating a presentation for a display device of the aircraft of the terminal area procedure chart.