Radar Moving-Target Detection Using Dual-Scan Beat-Frequency Analysis
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Solution Overview
Problem
Existing target detection devices face challenges in accurately detecting moving targets in multi-clutter environments, such as metallic tunnels and guard rails, due to signal reflections from clutter.
Innovation Solution
A radar system employing a 2D-antenna array with MIMO technology and a multi-clutter determiner to enhance detection performance by distinguishing moving components from clutter using beat frequency analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radar signal processing is used, then the device complexity is low, but the detection precision deteriorates in multi-clutter environments
Solution Approach 1:
The patent segments the received signal into multiple components by performing fast Fourier transform (FFT) to separate stationary clutter, moving clutter, and moving target signals based on their different Doppler frequency characteristics. This segmentation enables precise detection of moving targets in multi-clutter environments by analyzing each component separately.
Solution Approach 2:
The patent transitions from traditional single-dimension signal processing to multi-dimensional analysis by incorporating both range dimension (through FFT of received signals) and velocity dimension (through Doppler processing). This two-dimensional approach allows differentiation of targets based on both position and motion characteristics, improving detection precision.
2Reliability
If simple signal filtering is applied, then the device complexity remains low, but the reliability of target detection deteriorates due to clutter interference
Solution Approach 1:
The patent employs dynamic signal processing that adapts to different clutter conditions by calculating moving components through differential FFT operations. The system dynamically identifies and tracks moving targets by detecting changes in Doppler frequency over time, enhancing detection reliability in varying multi-clutter environments.
Solution Approach 2:
The patent implements a feedback mechanism where the detected moving components are continuously monitored and used to adjust the detection parameters. The system compares successive FFT results to identify consistent moving targets, providing feedback that improves detection reliability by confirming target presence across multiple measurement cycles.
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
Improves the detection of moving targets by effectively filtering out clutter signals, enhancing accuracy and reliability in complex environments.
Implementation Method 1
a radar sensor unit configured to transmit and to receive radar signals
Implementation Method 2
detect the target by transmitting a signal to detect the target and analyzing a reflecting signal of the transmitted signal from the target
Implementation Method 3
a frequency mixer configured to generate a beat frequency based on the transmitted signal and the received signal
Data Source
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Figure 1B
Figure 1C
AI summary
An apparatus for detecting a target is disclosed. The apparatus of detecting a target includes: a frequency mixer configured to calculate a first beat frequency based on a transmitted signal and a received signal of first scanning and calculate a second beat frequency based on a transmitted signal and a received signal of second scanning performed with a predetermined time interval from the first scanning; a controller configured to extract a first moving component by comparing an up-chirp period frequency and a down-chirp period frequency of at least one of the first beat frequency or the second beat frequency; extract a second moving component by comparing up-chirp period frequencies or down-chirp period frequencies of the first beat frequency and the second beat frequency; and determine the moving target based on the first moving component and the second moving component.