Signal Processing for Target Detection Scattering Reduction
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Solution Overview
Problem
Existing target detection systems face challenges in reducing the influence of scattering from mediums when continuously transmitting waves, as existing methods are ineffective in scenarios where transmitter and receiver separation or beam shaping are not feasible, leading to difficulties in accurately detecting targets.
Innovation Solution
A target detection device and method that includes a signal processing unit to estimate a lower limit distance where the intensity of scattered waves from the medium is below an allowable level, and removes scattered waves from the reflected signal within this range to isolate the target signal, allowing for effective detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the transmitter and receiver are installed at a predetermined distance apart to reduce scattering influence, then the scattering influence is reduced, but the device complexity and installation requirements increase
Solution Approach 1:
The invention extracts and removes the scattered wave signal from the received composite signal through signal processing. The signal processing unit identifies and eliminates the scattered wave component, leaving only the reflected wave from the target, thereby reducing scattering influence without requiring physical separation of transmitter and receiver
Solution Approach 2:
The invention changes the parameter of wave transmission from continuous transmission to pulse transmission. By transmitting waves in pulses with specific time intervals, the system can distinguish between scattered waves (arriving earlier) and reflected waves from targets (arriving later), enabling scattering reduction through temporal parameter control rather than spatial separation
2Object-affected harmful factors
If adaptive beamforming is used to change beam shape or direction to reduce scattering influence, then the scattering influence is reduced, but the device complexity and difficulty of operation increase
Solution Approach 1:
The signal processing unit extracts the scattered wave component from the received signal and removes it, achieving scattering reduction through simple signal processing operations rather than complex beamforming operations. This maintains ease of operation while effectively reducing scattering influence
3Object-affected harmful factors
If pulse transmission is used to reduce scattering influence, then the scattering influence is reduced, but the productivity and duration of continuous target detection decrease
Solution Approach 1:
The invention dynamically switches between pulse transmission and continuous transmission modes. During initial detection or when scattering is problematic, pulse transmission is used to reduce scattering influence. Once targets are detected or when scattering is not an issue, continuous transmission can be used to maintain continuous detection capability, thus adapting to different operational requirements
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 reduces the influence of scattering from the medium, enabling accurate target detection even in cases of continuous wave transmission by isolating the target signal from the scattered noise within the medium.
Implementation Method 1
a reception means for receiving a reflected wave that the wave is reflected in the medium
Implementation Method 2
an intensity level of a scattered wave from the medium in the detection distance range
Data Source
AI summary
The purpose of the present invention is to reduce the effects of scattering from a medium, during continuous transmission of waves and detection of a target. The invention is provided with: a transmitter for continuous transmission of waves for propagation through a medium; a receiver for receiving reflected waves produced when the waves are reflected within the medium; a signal processing device for estimating a lower limit distance of a detection distance range in which the intensity level of scattered waves from the medium in the detection distance range is at or below a permissible level, and outputting a signal obtained by eliminating from the reflected wave signal received by the receiver a scattered wave signal from the medium in a masking area from the receiver to the lower limit distance; and a detector for detecting a target within the medium, on the basis of the output from the signal processing device.