Sideband Residual Detection for Simultaneous Duplicate Transmissions
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Solution Overview
Problem
Existing methods for detecting double transmissions in aeronautical radio signals, such as those described in DE 10 2011 080 999 A1 and DE 10 2007 037105 A1, are computationally intensive and fail to distinguish between actual double transmissions and simulcast mode transmissions in the CLIMAX system, leading to security-related errors.
Innovation Solution
A measuring device and method that processes digital measurement signals by transforming them into the frequency domain, subtracting one sideband from another, and using a detection device to infer double transmissions based on residual signal components, thereby reducing computational load and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If non-linear distortion is used to detect double transmissions, then detection capability is improved, but computing effort increases significantly
Solution Approach 1:
The patent extracts only the necessary information (signal presence detection) without performing full non-linear distortion analysis. By using a simplified detection approach that focuses on detecting whether a second signal is present rather than fully characterizing it through non-linear distortion, the computing effort is significantly reduced while maintaining detection capability.
Solution Approach 2:
The patent changes the detection parameter from complex non-linear distortion characteristics to simpler signal presence indicators. This parameter transformation allows detection to be performed with lower computational resources while still achieving the goal of identifying double transmissions.
2Measurement precision
If non-linear distortion method is used, then double transmission detection is possible, but it cannot distinguish between CLIMAX simulcast mode and actual double transmission
Solution Approach 1:
The patent applies different detection strategies to different signal scenarios. By analyzing local characteristics of the received signal and applying context-appropriate detection methods, the system can distinguish between CLIMAX simulcast mode (where multiple transmitters are intentionally used) and actual double transmissions (where accidental simultaneous transmission occurs), thereby improving reliability.
3Measurement precision
If signal processing is performed before digitization, then detection accuracy may improve, but computing resources are consumed
Solution Approach 1:
The patent performs preliminary signal processing operations (such as filtering and preprocessing) in the analog domain before digitization. This allows certain detection准备工作 to be done with simpler, lower-power operations, reducing the computational burden on digital processing resources while still preparing the signal for accurate detection.
Data Source
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Figure 3
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AI summary
A measuring device serves to detect the simultaneous presence of at least one first signal and one second signal in a measurement signal. The measuring device contains a receiving device for receiving the measurement signal as a digital measurement signal (53) and a processing device (7). The processing device (7) has a transformation device (70) for transforming the digital measurement signal (53) into a measurement signal in the frequency range (54). The processing device (7) also includes a subtraction device (71) for subtracting a first sideband of the measurement signal in the frequency range (54) from a second sideband of the measurement signal in the frequency range (54). The subtraction device (71) generates a residual signal (55).