UHF Radar Vegetation Clutter Elimination
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Solution Overview
Problem
Current detection systems for sensitive areas are limited in their ability to anticipate intrusions, provide accurate location information, and maintain effectiveness in humid conditions, especially when vegetation obstructs radar signals, leading to false echoes from vegetation clutter.
Innovation Solution
A UHF radar system with a fixed antenna that transmits bursts of pulses, integrates signals over a defined time, and processes them to differentiate between intruder echoes and vegetation echoes using a method of forming and validating radar blips, allowing for accurate tracking and filtering of valid targets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a short-range surveillance radar operating in S band or X band is used to monitor the entire area, then the area can be kept under surveillance and intrusions can be detected and tracked, but the radar becomes inoperable when vegetation is present because the wavelengths are too short to penetrate or diffract around vegetational masks
Solution Approach 1:
The patent changes the fundamental parameter of radar operating frequency from S/X band to UHF band. This parameter change allows the radar to operate effectively in vegetated areas by utilizing the diffraction properties of UHF waves, which can bend around vegetational masks rather than being blocked by them, thus resolving the contradiction between detection reliability and adaptability to vegetated areas.
Solution Approach 2:
The patent converts the harmful effect of vegetation (which blocks S/X band radar) into a beneficial situation by using UHF waves that naturally diffract around vegetational masks. The presence of vegetation, which previously caused complete detection failure, now creates detectable diffraction patterns that can be used to identify targets behind or around vegetational obstacles.
2Ease of operation
If optical or infrared detectors are used to form a perimeter barrier, then the system is simple to operate, but the effectiveness deteriorates when the atmosphere becomes too humid
Solution Approach 1:
The patent replaces optical/infrared detection systems with a UHF radar system. This substitution moves from optical/mechanical detection to electromagnetic wave detection, which is inherently more reliable in humid atmospheric conditions. The radar system maintains ease of operation while achieving superior reliability in challenging environmental conditions.
3Ease of operation
If a perimeter surveillance system with distributed sensors is installed, then the system is simple to operate and can detect barrier breaching, but the system cannot provide anticipated signalling and requires complete area search after intrusion detection
Solution Approach 1:
The patent makes the radar system multi-functional by enabling it to perform both perimeter surveillance and area monitoring simultaneously. The UHF radar can detect barrier breaching events while also providing early warning of approaching intruders through area coverage, eliminating the need for separate systems and reducing response time through proactive detection capabilities.
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 effectively detects and tracks intruders in areas with vegetation, reducing false alarms and maintaining detection accuracy despite weather conditions and vegetation interference, by distinguishing between intruder and vegetation echoes through precise signal processing and validation.
Implementation Method 1
a fixed-antenna UHF radar designed and configured to cover the area in question. The radar constituting the system transmits bursts of pulses
Implementation Method 2
The radar constituting the system transmits bursts of pulses, integrates the signal received over a given integration time Ti
Implementation Method 3
integrates the signal received over a given integration time Ti and temporally samples the received signal
Implementation Method 4
it is a short-range surveillance radar... designed to have a diffracting character, so that the radar waves possess diffraction properties making it possible to see through a mask formed by a relief or by vegetation
Data Source
AI summary
A system includes a pulsed UHF radar for integrating the signal received over a given integration time. The integration time for the received signal and the size of the distance bin are defined in such a way that, taking into account the range of speeds of the targets of interest, a moving target of interest travels only a distance shorter than the size of the distance bin from one integration period to another. Furthermore, the UHF radar implements a method of forming radar blips from the received signal to form elementary blips from the signals received over the chosen integration time and to store them from one burst to another. The method also confirms that the elementary blips formed probably correspond to targets of interest and then forms, from the confirmed elementary blips, aggregate blips, the attributes of an aggregate blip depending on the attributes of the confirmed elementary blips from which the aggregate blip stems. The method also validates the aggregate blips formed, the validation of an aggregate blip depending on the distance measurement associated with this blip. The transmission of parasitic blips is reduced, brought about by the detection of echos relating to the movement of vegetation due to the action of the wind, to the tracking means.