Transpositional Modulation Radar Signal ECM Detection
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Solution Overview
Problem
Electronic countermeasures (ECMs) pose challenges for target tracking systems by generating decoy signals that confuse detection and tracking systems, and existing countermeasures are not effective in distinguishing between legitimate and deceptive signals.
Innovation Solution
Implementing transpositional modulation (TM) capable devices that embed TM signals in radar or sonar signals to enhance the resilience of target tracking systems, allowing them to differentiate between skin return signals and ECM signals by detecting the presence of TM signals, and using these signals to guide missiles or inform friendly units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional radar signals are used without transpositional modulation, then the radar system is compatible with existing equipment, but the system cannot distinguish between legitimate skin return signals and electronic countermeasure decoy signals
Solution Approach 1:
A transpositional modulation signal is introduced as an intermediary element within the radar signal structure. This mediator signal serves as a unique identifier that allows receiving systems to distinguish authentic radar returns from ECM decoys, resolving the signal identification problem without fundamentally changing the core radar functionality
Solution Approach 2:
The radar signal undergoes parameter changes through transpositional modulation, where specific signal characteristics are altered in a controlled manner. This modulation embeds identification information within the signal parameters, enabling reliable distinction between legitimate returns and decoys while maintaining overall signal integrity
2Measurement precision
If transpositional modulation is embedded in radar signals, then the ability to distinguish skin return signals from ECM signals is improved, but the system complexity increases
Solution Approach 1:
The transpositional modulation is applied in advance to the transmitted radar signal before it encounters any target or ECM. This preliminary embedding of identification markers ensures that the differentiation capability is built into the signal itself, allowing receiving systems to identify authentic signals without requiring complex post-detection analysis
Solution Approach 2:
The system incorporates feedback mechanisms where the presence or absence of transpositional modulation patterns in received signals provides information about signal authenticity. This feedback loop enables the radar system to adapt its processing and identification algorithms based on the detected modulation patterns, improving differentiation accuracy
3Loss of information
If TM signals are used to embed covert communication channels, then communication security is improved, but the signal processing complexity increases
Solution Approach 1:
The covert communication channel is merged with the existing radar signal structure through transpositional modulation. By combining the radar functionality with the communication function in a single signal, the system achieves secure communication without requiring separate dedicated communication systems, thus limiting the increase in overall system complexity
Data Source
AI summary
Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for detecting electronic counter measure (ECM) signals and embedding covert messages in radar or sonar signals. In one aspect, a method for detecting ECM signals includes receiving a radar return signal from an object. The method includes determining whether radar return signal includes a TM signal, and identifying the radar return signal as a skin return signal or an electronic counter measure signal based on whether the radar return signal includes the TM signal.