Distortion-Based Communications Localization Denial Techniques
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Solution Overview
Problem
Existing communication systems face challenges in preventing unintended localization and tracking of electromagnetic signals, as conventional methods either reduce spectral efficiency or fail to thwart localization attempts effectively.
Innovation Solution
The implementation of distortion-based techniques, such as linear distortion filtering, is used to impart bad autocorrelation properties on electromagnetic signals, making it difficult for unintended recipients to localize the signal source while maintaining data transfer efficiency, utilizing optimization methods like genetic algorithms to minimize localization degradation and maximize throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If distortion-based techniques are applied to signals, then localization detectability is reduced, but signal quality and data transfer efficiency may be degraded
Solution Approach 1:
The patent applies linear distortion filtering to modify the signal parameters, specifically changing the autocorrelation properties of the transmitted signal. This distortion transforms the signal in a controlled manner that degrades localization capabilities while preserving communication integrity through optimized filter design
Solution Approach 2:
The patent converts the harmful effect of signal distortion (which normally degrades signal quality) into a beneficial security feature. By carefully designing the distortion filter, the system transforms what would be a detrimental modification into a protective measure that actively prevents localization while maintaining acceptable communication performance
2Object-affected harmful factors
If conventional methods are used to prevent localization, then signal security is improved, but spectral efficiency is reduced
Solution Approach 1:
The patent changes the signal parameters through linear distortion filtering, modifying the autocorrelation function to prevent localization. This approach achieves security without requiring spread spectrum techniques or other methods that would consume additional bandwidth and reduce spectral efficiency
Solution Approach 2:
The patent replaces conventional localization-prevention mechanisms (such as spread spectrum or encryption) with a signal processing approach using linear distortion filtering. This substitution maintains spectral efficiency by working within the existing signal framework rather than requiring additional bandwidth or complex transmission protocols
Data Source
AI summary
An electronic transmitter includes: a generator circuit to generate a baseband signal; a modulator circuit to modulate a carrier signal with the baseband signal; an emitter to emit the modulated signal at an intended recipient; and a distortion circuit to apply a final distortion to the baseband signal or the modulated signal. The final distortion is optimized to minimize the ability of unintended recipients to localize the emitter using correlation-based techniques, and to minimize any degradation to the data rate of the emitted signal at the intended recipient. In some cases, the transmitter is part of an electronic communication system that also includes a receiver at the intended recipient. The receiver is aware of the final distortion and includes a collector to collect the emitted signal, and a demodulator circuit to demodulate the collected signal using the final distortion to recover the baseband signal.