Target Discrimination Using Pole Frequency Templates
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Solution Overview
Problem
Conventional methods fail to effectively discriminate a desired target within response signals from an area containing multiple targets, as the scattered response signals include poles from all objects, hindering the identification of the specific target.
Innovation Solution
A template of pole or damped sinusoid frequencies associated with the desired target is applied to the response signals, constructing a comb-like pattern for comparison, which yields a score indicating the presence of the target by matching the frequencies within the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional mathematical techniques (e.g., Matrix Pencil Method) are used to analyze response signals, then the technique provides greater stability and less sensitivity to noise, but the resulting scattering response contains poles from all objects in the illuminated scene, thereby hindering identification of the desired target
Solution Approach 1:
The patent segments the mixed response signal by constructing a template containing only the pole parameters (frequencies, damping constants, phases) of the desired target. This template is then correlated with the actual response signal to isolate and identify the desired target's contribution, separating it from other targets in the scene.
Solution Approach 2:
The patent extracts the distinctive pole parameters of the desired target to create a template, then uses correlation techniques to extract and identify the presence of this specific target from the composite response signal containing multiple targets.
2Loss of information
If the response signal from multiple targets is analyzed directly, then all pole information is preserved, but the identification of the specific desired target is hindered or prevented
Solution Approach 1:
The patent introduces a template as an intermediary element that contains the known pole parameters of the desired target. This template serves as a reference to correlate with the response signal, enabling selective identification of the desired target while maintaining information about all targets in the scene.
Solution Approach 2:
The patent changes the approach from analyzing raw pole parameters directly to analyzing the correlation between the response signal and a template constructed from specific pole parameters. This parameter transformation enables selective target identification while preserving overall scene information.
Data Source
AI summary
A template representing a desired target is applied to response signals from an area including a plurality of targets and illuminated by electromagnetic radiation. The response signals include poles or damped sinusoids representing resonances (e.g., resonant frequencies) distinctly associated with each of the targets within the area. An embodiment of the present invention utilizes pole or damped sinusoid frequencies of a desired target to construct the template or comb-like pattern that is compared to the mixture of pole frequencies within the response signals from the area. The comparison yields a resulting score that indicates the presence of the desired target within the area.