Transverse Antenna Array for Mine Detection
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Solution Overview
Problem
Existing object detection devices struggle to detect small, buried mines with dielectric constants similar to their surroundings, leading to difficulties in distinguishing reflections from mines and the environment, especially in sandy soils.
Innovation Solution
A device with a radiation set of aligned Vivaldi antennas arranged transversely to the vehicle's motion, capable of both transmission and reception, and a processing circuit that uses duplexing means and synthetic aperture processing to improve detection accuracy and reduce panel deformation issues, with adjustable frequency and altitude settings for better wave penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a large panel is used for the radiation set, then the detection coverage area is improved, but panel deformation causes inconsistency between emitted and reflected waves
Solution Approach 1:
The radiation set is divided into multiple independent antennas arranged in an alignment rather than using a single large panel. This segmentation allows each antenna to remain stable while collectively providing wide coverage through their distributed arrangement along the vehicle's path.
Solution Approach 2:
The patent replaces the mechanical panel structure with a distributed antenna system mounted on the vehicle. This substitution eliminates the mechanical deformation problem by using individual antennas that can independently maintain their electromagnetic properties without relying on a rigid large-scale mechanical support structure.
2Adaptability or versatility
If mines are made with dielectric constant similar to sand, then their detectability is improved (for camouflage), but their reflection coefficient becomes similar to surrounding sand making them difficult to detect
Solution Approach 1:
The invention uses frequency-dependent dielectric properties of sand and mines. By operating at specific frequencies (2-4 GHz) where the dielectric contrast between mines and sand is maximized, the system exploits local variations in electromagnetic properties to enhance detection despite the general similarity in dielectric constants.
Solution Approach 2:
The patent changes the operating frequency parameter to optimize detection. By selecting frequencies in the 2-4 GHz range and adjusting illumination angles, the system exploits frequency-dependent electromagnetic interactions that enhance the reflection coefficient difference between mines and surrounding sand, overcoming the camouflage effect.
3Measurement precision
If the vehicle flies at low altitude, then the detection resolution is improved, but the time to cover the explored zone increases
Solution Approach 1:
The system uses dynamic signal processing that adapts to the vehicle's motion. By processing radar returns in real-time and using synthetic aperture techniques that account for the vehicle's velocity and position, the system maintains high resolution at low altitudes while enabling faster coverage through efficient data acquisition and processing.
Solution Approach 2:
The patent uses synthetic aperture processing that recovers spatial information from radar returns collected at different positions along the vehicle's path. By synthesizing a larger effective aperture from multiple lower-altitude measurements taken over time, the system achieves high resolution without requiring the vehicle to fly slowly at high altitude.
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 device effectively detects various-sized mines by enhancing reflection coefficient differentiation and reducing panel deformation issues, achieving improved detection performance and resolution, particularly in sandy soils.
Implementation Method 1
a radiation set (18) arranged on a panel (25) and a processing circuit (50) to provide information about the presence of such objects
Implementation Method 2
to illuminate said zone to be explored and in reception to collect waves reflected from this zone
Implementation Method 3
the radiation set may be used both in transmission to illuminate said zone to be explored and in reception to collect waves reflected from this zone
Data Source
AI summary
A device for detecting objects such as mines placed in a zone to be explored, the device being placed on a vehicle moving at a velocity V and including a panel on which a radiation set is arranged to transmit signals at an illumination frequency and to receive signals reflected from the zone, and a processing circuit to provide information about the presence of the objects after processing of the reflected signals, wherein the radiation set includes an alignment of antennas arranged transverse to the velocity V of displacement of the vehicle.