Multi-Channel Radar Life Detection for Rubble Penetration
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Solution Overview
Problem
Current life detection radars face challenges in accurately detecting and locating multiple targets due to signal attenuation and the 'tailing' effect, which leads to erroneous identification and poor penetrability through thick media, especially in complex environments like rubble.
Innovation Solution
A multi-target life detection method that involves distance and time accumulation, noise cancellation, envelope extraction of inflection points, and ratio calculation to differentiate between target and background signals, combined with a four-channel ultra-wide band radar system and a five-joint metal foldable arm structure for improved detection flexibility and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single-channel axial detection is used for multi-target detection, then the device complexity is reduced, but the measurement precision of target position and the reliability of detection accuracy deteriorate due to signal attenuation and tailing effects
Solution Approach 1:
The patent segments the detection process into multiple channels (at least two channels) with different detection paths. Each channel independently processes signals from targets at different axial distances, allowing the system to distinguish between multiple targets without severe signal attenuation effects. This segmentation resolves the contradiction by maintaining relatively simple individual channel structures while achieving high precision through multi-channel integration.
Solution Approach 2:
The patent introduces a new dimension by using multiple detection channels with different spatial arrangements rather than relying solely on axial distance discrimination in a single channel. By detecting targets from multiple dimensional perspectives (different channels with different paths), the system achieves accurate multi-target positioning without the tailing effects that plague single-channel systems.
2Device complexity
If monostatic radar configuration is used, then the device complexity is reduced, but the penetrability through thick reinforced concrete deteriorates due to single detection path
Solution Approach 1:
The patent segments the radar system into multiple independent detection channels (at least two channels) with different detection paths, transforming a monostatic configuration into a multistatic arrangement. Each channel provides an independent detection path that can penetrate through thick reinforced concrete from different angles, resolving the contradiction by maintaining relatively simple channel structures while achieving superior penetration reliability through diversified paths.
Solution Approach 2:
The patent combines multiple detection channels with different paths into an integrated detection system. By merging the results from multiple independent channels that each penetrate through concrete from different angles, the system achieves enhanced penetration ability while keeping individual channel complexities low.
3Reliability
If fixed antenna arrays are used in multistatic radar, then the penetrability through media is improved by providing multiple detection paths, but the adaptability to rugged ruin surfaces deteriorates due to poor coupling between fixed probes and irregular surfaces
Solution Approach 1:
The patent employs movable or adjustable antenna structures that can dynamically adapt to rugged ruin surfaces. Instead of fixed antenna arrays, the system uses at least two channels with antennas that can be positioned and oriented to achieve good coupling with irregular surfaces while maintaining multiple detection paths for enhanced penetration ability.
4Device complexity
If single-channel detection is used for axial distance distinction, then the device complexity is reduced, but the reliability of target identification deteriorates due to great variation in signal amplitudes at different distances
Solution Approach 1:
The patent segments the detection function across multiple channels, with each channel optimized for detecting targets at specific axial distances. This segmentation allows the system to maintain consistent signal amplitudes for targets at different distances by distributing detection across channels rather than relying on a single channel to distinguish all axial distances, thereby improving target identification reliability.
Solution Approach 2:
The patent applies local quality by optimizing each detection channel for specific detection conditions (different axial distance ranges). Each channel is configured with appropriate parameters for its specific detection task, allowing reliable target identification across varying distances without requiring complex single-channel processing.
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 enhances the accuracy of multi-target detection and positioning by reducing signal attenuation and 'tailing' effects, increasing detection paths, and improving penetrability through complex surfaces, effectively addressing the limitations of existing systems.
Implementation Method 1
A life detection radar is a new type of radar, which involves both biomedical engineering and radar technologies and can penetrate through nonmetallic media (such as wood, soil, bricks, gravels, etc.) to detect vital signs
Implementation Method 2
transmitting a life detection radar signal and receiving an original echo signal of the life detection radar signal
Data Source
AI summary
Provided is a multi-target life detection method based on radar signals. The method includes: performing time accumulation in a slow time direction on a preprocessed echo signal to obtain a first echo signal; performing an envelope extraction of inflection points on the first echo signal to obtain a second echo signal; calculating an average value of all amplitude signals in the second echo signal other than M marked amplitude signals; and in response to a ratio of a marked amplitude signal to the average value being greater than a threshold, determining that a living target exists at a radar detection distance corresponding to the marked amplitude signal. According to the life detection method of the present disclosure, a normalization method is adopted to normalize signal amplitudes of the radar in a dimension of fast time (distance). In addition, two envelope extractions of inflection points may be performed.