Active Radar Cloaking Apparatus for Low-Frequency Interference
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Solution Overview
Problem
Conventional radar cloaking methods are ineffective for objects being monitored by radar systems, especially at lower frequencies, as they rely on passive techniques that are not suitable for all objects and are less effective at frequencies below 4-10 GHz.
Innovation Solution
An active radar cloaking apparatus that generates and transmits a cloaking radio signal based on a model encoding the scattering properties of a radar target, designed to destructively interfere with the reflected signal, thereby reducing its amplitude below the detection threshold of the radar system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If passive radar cloaking methods are used, then the object can be made less detectable by radar, but the effectiveness is reduced at lower frequencies below 4-10 GHz
Solution Approach 1:
The patent transitions from passive geometric cloaking to active electromagnetic parameter manipulation. By generating cloaking signals with specific amplitudes and phases that dynamically cancel scattered radar signals, the system achieves effective cloaking across a broad frequency range including lower frequencies below 4-10 GHz where passive methods fail.
Solution Approach 2:
The patent replaces passive mechanical/geometric cloaking structures with an active electronic system that generates electromagnetic cloaking signals. This substitution enables adaptive frequency coverage and maintains cloaking effectiveness across varying radar frequencies through electronic signal generation and phase control rather than fixed geometric structures.
2Reliability
If passive radar cloaking methods are used, then the object geometry and surface materials can be designed to reduce reflected signal power, but these methods are not suitable for all objects
Solution Approach 1:
The patent replaces object-dependent geometric and material-based passive cloaking with an active electromagnetic signal generation system. This system can be applied to any object regardless of its geometry or material composition, as it electronically generates cloaking signals that cancel the scattered radar signals from any target shape or material.
Solution Approach 2:
The active radar cloaking system provides universal applicability across different object types, geometries, and materials. By using electromagnetic signal generation and phase control rather than object-specific geometric design, the system achieves broad versatility and can cloak any radar target regardless of its physical characteristics.
3Reliability
If active radar cloaking signal generation is implemented, then the reflected signal can be reduced below detection threshold, but the device complexity increases
Solution Approach 1:
The patent implements feedback control by receiving a portion of the incident radar signal, determining the scattered signal characteristics, and generating cloaking signals with appropriate amplitude and phase to cancel the scattered components. This feedback mechanism enables automatic adaptation to different radar frequencies and target geometries, achieving effective cloaking despite the increased system complexity.
Solution Approach 2:
The patent introduces an intermediary signal processing system that receives radar signals, processes them through phase shifters and amplifiers, and generates cloaking signals. This intermediary layer manages the complexity by providing a structured approach to signal manipulation, using components like phase shifters and variable gain amplifiers to achieve the desired cloaking effect without requiring direct complex integration of all functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The active radar cloaking apparatus effectively reduces the detectability of objects by radar systems across various frequencies, including lower frequencies, by generating a cloaking radio signal that destructively interferes with the reflected signal, rendering the object undetectable.
Implementation Method 1
a cloaking radio signal configured to destructively interfere with a reflected signal generated by an interrogating radar signal scattering and/or reflecting off of a radar target
Data Source
AI summary
A radar cloaking apparatus configured for positioning on a radar target and corresponding methods are provided. The radar cloaking apparatus comprises a radio signal emitter and computational circuitry. The computational circuitry is configured to cause the radar cloaking apparatus to at least reference a model encoding scattering properties of the radar target; determine a predicted reflection signature of the radar target from a selected interrogation angle based at least in part on the model encoding the scattering properties of the radar target; and cause transmission, by the radio signal emitter, of a cloaking radio signal along the selected interrogation angle. The cloaking radio signal is actively generated based on the predicted reflection signature of the radar target shifted in phase such that the cloaking radio signal is configured to destructively interfere with a reflected signal formed by an interrogating radar signal scattering off of the radar target.