Aircraft Traffic Alert System Dynamic Sensitivity Adjustment
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Solution Overview
Problem
Traffic alerting systems in aircraft face challenges in adjusting sensitivity levels effectively between enroute and terminal environments, leading to either false alarms or late collision alerts due to differing traffic densities and speeds, and existing methods are inadequate for automatic adjustment.
Innovation Solution
An in-aircraft traffic alert system that automatically adjusts sensitivity based on the aircraft's position using GPS and a database of airport locations and airspaces, suppressing unnecessary alerts and providing sensitivity levels corresponding to the class of airspace, and considering the flight characteristics of nearby aircraft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high sensitivity mode is used in terminal environment, then collision detection capability is improved, but false alarm rate increases
Solution Approach 1:
The patent implements dynamic sensitivity adjustment by automatically switching between high sensitivity mode (enroute) and low sensitivity mode (terminal) based on the aircraft's geographic position relative to airports in the database. This resolves the contradiction by making the sensitivity parameter adaptive rather than fixed, allowing the system to optimize collision detection capability while minimizing false alarms according to the operational environment.
Solution Approach 2:
The system changes the sensitivity parameter automatically based on position data compared against airport boundaries in the database. By modifying the sensitivity parameter according to whether the aircraft is within or outside terminal airspace, the system achieves high collision detection when needed while suppressing false alarms in terminal environments.
2Object-generated harmful factors
If low sensitivity mode is used in terminal environment, then false alarm rate is reduced, but collision detection capability deteriorates
Solution Approach 1:
The system dynamically adjusts sensitivity based on real-time position information, switching to high sensitivity mode when in enroute environment and low sensitivity mode when in terminal environment. This ensures optimal collision detection capability is maintained in each environment without suffering from the opposite problem.
Solution Approach 2:
The sensitivity parameter is automatically changed based on the aircraft's position relative to airport boundaries stored in the database, ensuring the appropriate sensitivity level is applied for the current operational context.
3Device complexity
If manual control is used to adjust sensitivity, then system complexity is reduced, but pilot workload increases
Solution Approach 1:
The system automatically determines the aircraft's position using GPS or FMS data, compares it against airport boundaries in the database, and autonomously adjusts the sensitivity mode without requiring pilot intervention. This eliminates manual workload while maintaining appropriate sensitivity levels.
Solution Approach 2:
The system continuously monitors position data and automatically adjusts sensitivity based on whether the aircraft is within or outside terminal airspace boundaries, creating a closed-loop system that adapts to changing operational conditions without pilot input.
4Extent of automation
If pressure altitude is used to adjust sensitivity, then automatic adjustment is achieved, but reliability deteriorates when aircraft descends enroute
Solution Approach 1:
The patent introduces a database of airport locations and boundaries as an intermediary reference. Instead of relying solely on pressure altitude, the system compares the aircraft's position against stored geographic data to determine whether the aircraft is in terminal or enroute environment, providing more reliable automatic sensitivity adjustment even during enroute descends.
Solution Approach 2:
The system pre-loads airport boundary data into the database before flight, enabling automatic sensitivity adjustment based on position comparison. This preliminary preparation allows the system to accurately determine the operational environment without relying on pressure altitude alone.
Data Source
AI summary
An aircraft traffic alert system that minimizes false alarms and unnecessary alerts by automatically adjusting the sensitivity of the system based on proximity to an airport. The system also can use information from a flight management system (FMS) or GPS navigation system (GNS) to only adjust the sensitivity near a destination airport and to suppress potential alerts for possible collisions with other aircraft that will be moot based on planned course changes of the subject aircraft. The system also can suppress alerts related to another aircraft when the other aircraft is landing on a parallel runway to the runway on which the subject aircraft is landing. The system may use multiple sensitivity levels based on different airspace classes, each class being associated with a different sensitivity level.