Non-linear Distortion Module for Secure RF Signal Jamming
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Solution Overview
Problem
Electronic communications receivers can be jammed by interference signals, and existing technologies fail to effectively distinguish and decode signals from friendly receivers while jamming unfriendly ones.
Innovation Solution
A radio frequency communications system that employs a transmitter with a distortion module to impart non-linear distortion to signals, and a change module to periodically alter the distortion characteristics, making it difficult for unfriendly receivers to detect and decode the signal while allowing friendly receivers to recognize and decode it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If non-linear distortion is applied to the transmit signal, then the signal is hidden from unfriendly receivers and appears as random noise, but the device complexity increases due to the distortion module and change module
Solution Approach 1:
The distortion is applied preliminarily to the transmit signal before transmission. The distortion module imparts non-linear distortion to the signal in advance, and the change module pre-configures the sequence of distortion characteristic changes according to a change key. This preliminary action ensures that when the signal reaches unfriendly receivers, it already appears as random noise, making interception ineffective.
2Object-affected harmful factors
If the distortion characteristics are changed periodically, then the signal protection is enhanced and unfriendly receivers are jammed, but the difficulty of detecting and measuring the signal increases for friendly receivers
Solution Approach 1:
The system employs feedback through synchronized change keys at both transmitter and receiver ends. The change module periodically alters distortion characteristics according to a pre-shared change key, and the friendly receiver uses the corresponding change key to reverse the distortion. This feedback mechanism ensures that while unfriendly receivers see random noise, friendly receivers can successfully detect and decode the signal.
3Object-affected harmful factors
If non-linear distortion is applied to hide the signal, then the computational complexity for unfriendly receivers to remove distortion becomes nearly impossible, but the loss of information increases due to the complex distortion
Solution Approach 1:
The system changes parameters of the distortion characteristics periodically according to a change key. By varying the distortion parameters over time in a controlled manner, the signal remains recoverable for authorized receivers with the correct change key, while appearing as random noise to unauthorized receivers. This parameter changes approach prevents permanent information loss while maintaining security.
Data Source
AI summary
A transmit signal can be distorted with non-linear distortion, and one or more characteristics of the non-linear distortion can be periodically changed in accordance with a change key. The transmission received at a receiver can thus comprise a severely distorted version of the transmission of the transmit signal. A receiver with the same change key can recognize and decode the transmission, but it can be extraordinarily difficult for receivers that lack the change key to detect and decode the transmission. The transmission can be a communications while jamming (CWJ) transmission. The CWJ transmission can contain a coded message that can be decoded only by friendly RF receivers, and the CWJ transmission can also jam unfriendly RF receivers that lack a change key for decoding the coded message.