Adaptive Resonator Cloaking for Doppler Radar Deception
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies face challenges in effectively cloaking objects from radar detection systems, particularly in achieving all-angle operation, dual polarization operation, maintaining bandwidth, and conforming to real object geometries while ensuring mechanical rigidity and weight constraints.
Innovation Solution
A cloaking system comprising a structure with controllable resonance frequency resonators, arranged to generate a phase shift between incident and scattered electromagnetic waves. The system includes a controller that adjusts the resonance frequency based on velocity data to provide a time-varying resonance frequency with a linear time-dependence, ensuring effective cloaking across a broad frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional stealth technology and passive scattering reduction are used, then radar cross section is reduced, but detection distance and effectiveness improve for the radar system
Solution Approach 1:
The patent employs dynamic resonance frequency control of metamaterial resonators to adaptively compensate for Doppler phase shifts. The resonance frequency is dynamically adjusted based on the relative velocity between radar and target, transforming a static cloaking structure into an adaptive system that maintains effectiveness against moving targets.
Solution Approach 2:
The patent changes the resonance frequency parameter of the metamaterial resonators in real-time to counteract Doppler effects. By varying this key parameter according to velocity data, the system maintains phase cancellation effectiveness despite relative motion between radar and target.
2Object-affected harmful factors
If phase cancellation structures are used to counteract Doppler shifts, then moving target visibility is reduced, but the system complexity increases
Solution Approach 1:
The patent implements a feedback control system where velocity data from the moving object feeds into the resonance frequency control mechanism. This closed-loop approach automatically adjusts the resonator frequency to match the Doppler shift, eliminating the need for complex manual calibration or prediction algorithms.
Solution Approach 2:
The system uses the velocity information inherently possessed by the moving object to automatically adjust its own cloaking parameters. The moving object's motion data directly controls the resonance frequency adjustment, making the system self-regulating without external intervention.
3Object-affected harmful factors
If broadband frequency operation is achieved, then detection system effectiveness is reduced across multiple frequencies, but maintaining consistent phase shift across bandwidth becomes difficult
Solution Approach 1:
The patent dynamically adjusts the resonance frequency to track the incident radar frequency across a broadband range. Rather than relying on fixed broadband resonators, the system adapts its resonant characteristics in real-time, maintaining effective phase cancellation across varying frequencies through active control.
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 system achieves effective cloaking by compensating for Doppler phase shifts, making moving targets appear stationary to radar systems, thereby reducing visibility and rendering the target invisible to MTI filters.
Implementation Method 1
The controller (14) is configured for controlling the resonance frequency to provide a time-varying resonance frequency having a temporal function which comprises a linear time-dependence; characterized in that said controller (14) is configured to receive velocity data characterizing a motion of a vehicle (30) and to select said time-varying resonance frequency based on said velocity data
Implementation Method 2
a structure having a plurality of resonators having a controllable resonance frequency, wherein the resonators are arranged to collectively ensure that variation of the resonance frequency over a predetermined range of resonance frequencies generates a phase shift between the an electromagnetic wave incident on the structure and an electromagnetic wave scattered off the structure
Data Source
Figure 1A~1B
Figure 2~3
Figure 4A~4C
AI summary
A cloaking and/or deception system comprises: a structure having a plurality of resonators characterized by a controllable resonance frequency, wherein the resonators are arranged to collectively ensure that variation of the resonance frequency over a predetermined range of resonance frequencies generates a phase shift between the an electromagnetic wave incident on the structure and an electromagnetic wave scattered off the structure; and a controller configured for controlling the resonance frequency to provide a time-varying resonance frequency characterized by a temporal function which comprises a linear time-dependence.