Stepped-Frequency Radar Wall Penetration Motion Compensation
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Solution Overview
Problem
Existing detection methods struggle to accurately identify moving entities concealed behind walls, such as people, due to limitations in visual recognition and the inability to penetrate solid structures effectively.
Innovation Solution
A method and system utilizing stepped-frequency radar signals transmitted through a wall, with an antenna in motion, to detect reflections and determine characteristics of motion, compensating for system motion effects by analyzing frequency and phase shifts, and generating data to identify moving objects beyond the wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radar signals are transmitted through walls to detect moving entities, then detection capability behind obstacles is improved, but signal attenuation and detection precision deteriorate
Solution Approach 1:
The patent introduces motion sensors (GPS, inertial sensors) as intermediaries to measure and characterize the motion of the radar system itself. This motion characterization data serves as a mediator to compensate for the effects of system motion on the reflected signals, thereby maintaining detection precision even when operating in challenging environments where the system may be moving.
Solution Approach 2:
The patent employs motion compensation techniques that dynamically adjust signal processing parameters based on the measured motion characteristics of the radar system. By changing processing parameters in response to measured motion, the system maintains precision in detecting moving entities behind walls despite the attenuating effects of wall penetration.
2Ease of operation
If the antenna is in motion during signal transmission, then operational flexibility and situational coverage are improved, but phase shift accuracy and measurement reliability deteriorate
Solution Approach 1:
The patent implements preliminary motion measurement using GPS and inertial sensors to characterize the antenna's motion before and during signal transmission. This preliminary action of measuring motion parameters allows the system to subsequently compensate for motion-induced phase shifts, maintaining measurement reliability while preserving operational flexibility.
Solution Approach 2:
The system continuously monitors antenna motion through motion sensors and feeds this motion data back into the signal processing chain. This feedback mechanism allows real-time compensation for motion effects on phase measurements, enabling reliable detection even when the antenna is in motion during operation.
3Measurement precision
If motion compensation techniques are applied to correct phase shifts, then detection accuracy is improved, but system complexity and processing requirements increase
Solution Approach 1:
The patent uses motion sensors as intermediaries to measure system motion, providing motion characterization data that simplifies the compensation process. Rather than implementing complex algorithms to directly analyze and correct phase shifts, the system uses the intermediary motion measurement data to guide simpler compensation operations, reducing overall processing complexity while maintaining 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
Enables accurate detection of moving objects, including subtle movements like breathing, through walls, improving situational awareness in military and rescue operations by providing reliable presence information of entities in obstructed visual fields.
Implementation Method 1
a radar transmitter to transmit stepped-frequency radar signals
Implementation Method 2
detect reflections of the transmitted signal
Implementation Method 3
an inertial sensor to measure and characterize motion of the radar system
Implementation Method 4
a global positioning system sensor
Implementation Method 5
compensate for the effect of the motion of the system on the phase shifts between the transmitted signal and the reflections
Data Source
AI summary
A system and method for detecting entities based on movement can involve transmission circuitry configured to enable transmission of a stepped-frequency radar signal, an antenna, and receiving circuitry configured to generate data including information associated with frequency and phase shifts between the transmitted signal and the reflections of the transmitted signal. The system also can involve a processor configured to analyze the generated data to determine information associated with a moving object located at a side of a wall different than a side of the wall of which the system is located. The analyzing can involve compensating for the effect of motion of the system on the phase shifts between the transmitted signal and the reflections of the transmitted signal.