Stepped-Frequency Radar Wall Penetration Detection
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Solution Overview
Problem
Existing detection methods fail to effectively detect moving entities, such as people, concealed behind walls due to visual obstruction, requiring a technology that can penetrate barriers and accurately identify movement.
Innovation Solution
A method and system using stepped-frequency radar signals transmitted through a wall, with multiple antennas to detect and analyze frequency and phase shifts of reflected signals, enabling the identification of moving objects in multiple spatial dimensions, and accounting for system motion during transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visual recognition methods are used to detect entities, then detection simplicity is maintained, but detection capability fails when visual obstruction (walls) is present
Solution Approach 1:
The patent replaces visual recognition (optical/mechanical system) with radar signal transmission and reception (electromagnetic system). The radar system transmits stepped-frequency signals through walls and detects reflections to identify moving entities, substituting the failed visual mechanism with an electromagnetic wave-based detection system that can penetrate obstacles.
Solution Approach 2:
The patent introduces radar signals as an intermediary medium to detect entities behind walls. Instead of direct visual contact, the system uses transmitted radar waves that interact with the target entity and return reflected signals, which are then processed to determine entity presence and movement characteristics.
2Measurement precision
If multiple antennas and signal processing are used to detect moving entities behind walls, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent divides the detection system into multiple spatially separated antennas that independently receive radar signal reflections. By distributing reception across multiple antenna elements at different locations, the system achieves better spatial discrimination and measurement precision while managing complexity through modular antenna design.
Solution Approach 2:
The patent adds spatial dimensionality to detection by using multiple antennas positioned at different locations and orientations. This multi-dimensional antenna array enables the system to distinguish signals from different directions and depths behind walls, improving detection accuracy through spatial analysis of reflected radar signals.
3Reliability
If radar signals are transmitted through walls to detect moving entities, then ability to penetrate barriers is improved, but signal differentiation between moving and stationary objects becomes more difficult
Solution Approach 1:
The patent employs stepped-frequency radar signals that are transmitted in periodic sequences with varying frequencies. By analyzing the temporal and frequency characteristics of reflected signals across multiple periodic transmissions, the system differentiates between stationary wall structures and moving entities based on Doppler shifts and signal phase changes.
Solution Approach 2:
The patent uses feedback mechanisms where received radar signals are continuously processed and compared against reference signals. The system analyzes phase and frequency shifts in the reflected signals to generate information about moving entities, using this feedback to refine detection and distinguish movement from static background reflections.
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 entities beyond walls by differentiating between moving and stationary objects, and subtle movements like breathing, providing a reliable method for military and rescue operations.
Implementation Method 1
a radar transmitter to transmit a stepped-frequency signal
Implementation Method 2
detecting reflections of the transmitted signal with a first antenna at a first detection location and with a second antenna at a second detection location. The method also includes generating data including information associated with frequency and phase shifts between the transmitted signal and the reflections
Data Source
AI summary
A system and method for enabling transmission of a stepped-frequency radar signal can involve a first antenna and a second antenna. The system can also involve receiving circuitry configured to receive detected reflections from the antennas and to generate data including information associated with frequency and phase shifts. The system can further involve a processor configured to receive the generated data from the receiving circuitry and to analyze the generated data to determine information associated with a moving object located at a side of a wall opposite to the system by differentiating reflections of the transmitted signal detected with the first antenna from reflections of the transmitted signal detected with the second antenna.