Wall-Penetrating Radar Detection Using Clutter and Correlation Maps
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Solution Overview
Problem
Current detection technologies face challenges in accurately identifying and tracking moving objects behind walls due to radiofrequency blockages and multipath issues, which hinder effective object detection and classification.
Innovation Solution
A device that transmits stepped-frequency radar signals through walls to detect and process reflected signals, utilizing clutter maps and correlation maps to differentiate between moving and stationary targets, while suppressing multipath and sensor-induced errors, and employing multi-hypothesis tracking to classify and predict object motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar signals are transmitted through walls to detect objects on the other side, then object detection capability is improved, but radiofrequency blockage and attenuation reduce signal strength and detection reliability
Solution Approach 1:
The system transmits radar signals at multiple frequencies and adjusts signal parameters dynamically to penetrate different wall materials effectively, compensating for attenuation losses by optimizing frequency selection and signal power
Solution Approach 2:
The system uses clutter maps and correlation maps as intermediary data structures to process and interpret reflected signals, enabling reliable object detection despite signal attenuation by comparing expected vs. actual returns
2Measurement precision
If radar signals are transmitted through walls to detect objects, then detection capability is improved, but multipath interference and sensor-induced errors increase false detections
Solution Approach 1:
The system generates clutter maps from multipath reflections and stationary objects, then uses correlation maps to distinguish between actual moving targets and multipath artifacts, converting harmful interference into useful reference data for false alarm rejection
Solution Approach 2:
The system extracts and removes sensor-induced motion errors and multipath components from the detected signal through correlation analysis, isolating genuine target signatures from spurious detections
3Reliability
If multiple frequencies are used to overcome blockage, then detection reliability is improved, but device complexity increases
Solution Approach 1:
The radar system uses a single multi-frequency transmitter that can operate across multiple frequency bands, providing universal penetration capability through different wall materials without requiring separate hardware systems for each frequency
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
Enables accurate detection and classification of moving objects behind walls by overcoming radiofrequency blockages and multipath interference, providing reliable tracking and prediction of object motion.
Implementation Method 1
a radar transmitter to transmit a stepped-frequency radar signal that includes a plurality of frequencies
Implementation Method 2
a radar receiver to detect reflected portions of the radar signal
Data Source
AI summary
Systems and methods for sensing targets on an opposite side of a wall are disclosed. In some aspects, the techniques include providing an indication to a user that portions of reflected radar signals were blocked by radiofrequency-blocking material at the wall. In some aspects, the techniques include identifying candidate targets as multipath echoes or motion-induced errors based on a correlation map.