Moving-Target Detection Using Doppler Shift Waveform Deformation
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Solution Overview
Problem
Current moving-target detection systems face challenges in detecting targets with low Signal-to-Noise (S/N) ratios, particularly with a single sensor, as the clarity of reflected waves is obscured by noise, making it difficult to estimate Doppler shifts and accurately sense target positions.
Innovation Solution
A moving-target detection system that includes a transmission waveform setting mechanism, a transmission unit, a reception unit, a Doppler shift estimation unit, a transmission waveform deformation unit, and a target sensing unit, which allows for the estimation of Doppler shifts and deformation of transmission waveforms to improve target detection performance even with a single sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sensor is used for target detection, then device complexity is reduced, but measurement precision deteriorates due to low S/N ratio and difficulty in estimating Doppler shifts
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing multiple deformation waveforms corresponding to different Doppler shift amounts before actual target detection. When a target is detected, the system quickly retrieves and applies the appropriate pre-prepared waveform without performing complex real-time calculations, thus achieving high-precision Doppler compensation with a single sensor while maintaining low device complexity
Solution Approach 2:
The patent implements dynamics by making the transmission waveform adaptable and changeable based on the detected Doppler shift amount. The system dynamically selects and applies different deformation waveforms from a set of pre-prepared waveforms, allowing the single sensor system to adapt to different target velocities and maintain high detection precision without requiring multiple fixed sensors
2Device complexity
If conventional replica correlation is used for target detection, then the detection process is simple, but measurement precision deteriorates in low S/N ratio conditions due to inability to accurately estimate Doppler shifts
Solution Approach 1:
The patent applies preliminary action by pre-calculating deformation waveforms for various Doppler shift scenarios and storing them in advance. This eliminates the need for complex real-time Doppler estimation and iterative processing, allowing the system to achieve high precision in low S/N ratio conditions by simply matching the received signal with pre-prepared waveforms, thus maintaining detection process simplicity while improving measurement precision
Solution Approach 2:
The patent implements parameter changes by transforming the transmission waveform parameters (applying different deformation amounts) based on detected Doppler shift characteristics. The system changes the waveform parameters to match the target's motion state, enabling accurate target detection in low S/N ratio conditions without requiring complex detection algorithms
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
The system enhances target detection performance by allowing for flexible transmission waveforms and reducing the calculation load, enabling accurate sensing of moving targets even in low S/N ratio conditions.
Implementation Method 1
a moving-target detection system is a system which transmits a wave such as an electromagnetic wave, a sound wave, or a light wave, and then detects a moving target by a reflected wave from the target
Implementation Method 2
When a target is moving, a wave reflected from the target causes a Doppler shift due to a Doppler effect
Data Source
AI summary
In order to enhance the performance with which a moving target is detected by a single sensor and with a degree of freedom in a transmission waveform, a moving-target detection system 1 has a transmission waveform setting means 101 for setting a transmission waveform St(t), a transmission means 102 for transmitting a wave having the set transmission waveform St(t), a reception means 103 for receiving a wave including a reflected wave from a target, a Doppler shift estimation means 104 for estimating a Doppler shift that occurs due to movement of the target from the transmission waveform St(t) and a reception waveform Sr(t) including the reflected wave, a transmission waveform deformation means 105 for generating a deformed transmission waveform in which the transmission waveform St(t) is deformed in accordance with the estimated Doppler shift, and a target sensing means 106 for sensing the target using the deformed transmission waveform.