EM Tagging Device for Radar Clutter Spectral Separation
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Solution Overview
Problem
Conventional methods for removing clutter from radar cross section measurements are ineffective, especially when there are significant interactions between the target and clutter sources, leading to contaminated data due to hardware and software limitations.
Innovation Solution
The use of an electromagnetic (EM) tagging device that spectrally tags clutter sources by modulating between distinct radar cross section states, allowing for the identification and removal of contaminating signals or fields, including interactions with the target, without disturbing existing fields or target RCS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional vector background subtraction is used to remove clutter, then the measurement process is simple, but the measurement precision deteriorates when there are significant interactions between target and clutter
Solution Approach 1:
The EM tagging device is positioned near the clutter source before measurements begin to spectrally tag it. This preliminary tagging allows the system to identify and separate clutter signals from target signals during subsequent measurements, resolving the issue of inaccurate RCS measurements when target-clutter interactions occur.
Solution Approach 2:
The EM tagging device acts as an intermediary between the clutter source and the radar system. By modulating the clutter's electromagnetic signature, it enables the radar system to distinguish tagged clutter signals from untagged target signals, thereby improving measurement precision without significantly increasing system complexity.
2Object-affected harmful factors
If hardware methods are used to reduce clutter RCS through shaping and material selection, then clutter contamination is reduced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of using mechanical hardware modifications (shaping, material selection) to reduce clutter RCS, the invention substitutes an electromagnetic field-based solution. The EM tagging device modulates the clutter's electromagnetic signature, allowing software-based separation of clutter and target signals, thereby reducing clutter contamination without increasing hardware complexity.
Solution Approach 2:
The EM tagging device changes the electromagnetic parameters (frequency modulation) of the clutter source dynamically. By modulating the clutter signal at a specific frequency, the system can selectively filter and remove clutter components from the composite signal, reducing contamination while keeping the clutter source hardware simple.
3Measurement precision
If spectral tagging with EM tagging device is implemented, then measurement precision improves by separating clutter and target signals, but the device complexity increases
Solution Approach 1:
The spectral tagging method segments the composite radar signal into distinct components based on their frequency characteristics. By tagging clutter at a specific modulation frequency, the signal processing system can separate tagged clutter signals from untagged target signals through frequency-domain analysis, improving measurement precision.
Solution Approach 2:
The EM tagging device applies periodic modulation to the clutter source at a specific frequency. This periodic action creates a distinctive spectral signature for clutter signals, enabling the radar system to identify and separate clutter from target returns through frequency-selective processing, thereby improving RCS measurement accuracy.
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
This approach enables accurate identification and removal of clutter contamination, providing a clear radar cross section of the target by separating and compensating for both tagged and un-tagged components of the reflected signals, thereby improving data accuracy.
Implementation Method 1
The tagging device may be modulated between two or more distinct RCS states to spectrally tag the clutter source. The fields reflected from the clutter source and EM tagging device or EM surface contains both tagged and un-tagged components.
Data Source
AI summary
A system for performing radar cross section measurements of a target may include a radar system and an antenna associated with the radar system to transmit signals and to receive reflected signals from the target and a clutter source. An EM tagging device is locatable proximate to the clutter source to spectrally tag the clutter source by causing changes in an electromagnetic signal reflected by the clutter source when a predetermined radar signal transmitted by the radar system is incident on the target, the clutter source and the EM tagging device. A module may identify a spectrally tagged component of reflected signals received by the radar system from the target, the clutter source and the EM tagging device. The module monitors the spectrally tagged component, compensates for variations in an un-tagged component of the reflected signals caused by the clutter source and EM tagging device, and subtracts contamination caused by the clutter source and EM tagging device and their interactions with the target, to provide a radar cross section of the target with reflected signals from the clutter source removed.