Control Station Interference Detection for Air Traffic Control
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Solution Overview
Problem
In air traffic control wireless communication, significant differences in reception levels of radio waves make it difficult for human ears to detect interference, leading to potential oversight of interference occurrence, especially when the difference is 20 dB or more.
Innovation Solution
A control station device with an interference determination unit that uses multiple methods to detect interference in real time, a multi-wave simultaneous reception start determination unit to track signal termination, and an alarm display unit to issue alarms indicating interference and signal termination states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If human ears are used to detect interference, then the detection method is simple and requires no additional equipment, but the detection reliability deteriorates when reception level difference is 20 dB or more
Solution Approach 1:
The patent replaces the mechanical human auditory system with an electronic interference determination unit that automatically analyzes received signals. This unit calculates correlation between signals and detects interference objectively, eliminating the limitations of human hearing when reception level differences exceed 20 dB.
Solution Approach 2:
The patent introduces an intermediary computational process that calculates correlation values between received signals and reference signals. This intermediary metric provides an objective measure of interference that can be detected even when human ears cannot perceive audio overlapping or abnormal noise.
2Reliability
If multiple interference detection methods are used, then the interference detection reliability is improved, but the device complexity increases
Solution Approach 1:
The interference determination unit is designed as a multi-functional device that performs multiple detection methods (correlation calculation, audio overlapping detection, abnormal noise detection) within a single integrated system. This allows the system to achieve high reliability through multiple methods without proportionally increasing overall device complexity.
Solution Approach 2:
The patent segments the interference detection function into distinct operational modes or methods that can be individually executed. The interference determination unit can selectively apply different detection methods (first method using correlation, second method using audio analysis) depending on signal conditions, allowing comprehensive detection while managing complexity through modular operation.
3Ease of operation
If only audio-based detection is used, then the detection method is simple, but the detection precision deteriorates when reception levels differ significantly
Solution Approach 1:
The patent replaces subjective audio-based detection with objective computational analysis. The interference determination unit calculates correlation coefficients and other quantitative metrics to precisely measure interference, providing accurate detection even when reception level differences make audio-based detection ineffective.
Data Source
AI summary
A control station device includes a wireless machine having an interference determination unit that uses one or multiple methods for a received signal to determine in real time whether interference has occurred, a multi-wave simultaneous reception start determination unit that causes received interfering waveform information to be held in a memory and determines whether a plurality of signals have been simultaneously terminated, and an alarm display unit that issues a first alarm indicating an interference state and a second alarm indicating termination of simultaneous transmission based on information from the interference determination unit and information from the multi-wave simultaneous reception start determination unit.