Radar Signal Synthesis for Clutter Suppression and Target Detection
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Solution Overview
Problem
Existing radar devices face challenges in suppressing unused signals while preventing necessary signals from being suppressed, particularly due to limitations in threshold processing and Doppler processing, which can lead to difficulties in detecting targets and suppressing clutter and land echoes.
Innovation Solution
A radar device that incorporates a Doppler processor, an improvement level calculator, and a signal synthesizer to generate Doppler processed signals and improve signal-to-noise ratio by comparing amplitude values of reception and Doppler processed signals, allowing for accurate separation of signals based on relative speeds and unified noise floors, thereby enhancing radar image creation and target detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Doppler processing is performed to suppress clutter echoes, then clutter suppression is improved, but target echoes at the same speed as clutter are also suppressed
Solution Approach 1:
The radar device dynamically switches between Doppler processing mode and non-Doppler processing mode based on the detection results. When a target is detected in the Doppler processed image, the system switches to non-Doppler processing to prevent suppression of target echoes, thereby adapting the processing method to the actual detection needs
Solution Approach 2:
The system uses feedback from target detection results to control the processing mode. The detection unit detects targets in the Doppler processed image, and this detection result feeds back to the control unit, which then switches to non-Doppler processing mode to avoid suppressing the detected target echoes
2Object-affected harmful factors
If threshold processing is performed to suppress unused signals, then signal suppression is improved, but necessary target signals may be suppressed
Solution Approach 1:
The radar device dynamically adjusts the processing method based on signal characteristics. When amplitude differences between clutter and target are small, the system switches to non-Doppler processing with adjusted thresholds to preserve target signals while still suppressing unused signals
Solution Approach 2:
The system changes processing parameters (Doppler processing enabled/disabled, threshold values) based on the amplitude comparison results. When clutter and target amplitudes are similar, the system disables Doppler processing and adjusts thresholds to maintain target signal integrity
3Device complexity
If only threshold processing is performed without Doppler processing, then processing simplicity is improved, but target detection difficulty increases when amplitudes are similar
Solution Approach 1:
The system dynamically selects the processing method based on amplitude comparison results. When clutter and target amplitudes differ significantly, simple threshold processing is used. When amplitudes are similar, Doppler processing is activated to improve target detectability, thus adapting complexity to actual needs
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 solution effectively improves the signal-to-noise ratio by combining reception and Doppler processed signals, eliminating the suppression of target echoes and clutter, and allowing for precise detection of target objects by emphasizing relevant signals.
Implementation Method 1
The Doppler processing is to exactly detect target objects (e.g., other ships) with relative speeds by utilizing that frequencies of the reception signals differ according to the differences in speed (relative speeds) of the target objects with respect to the ship concerned
Data Source
AI summary
A radar device is provided, which includes a receiver for transmitting a pulse-shaped radio wave and receiving a corresponding reflection signal as a reception signal, a Doppler processor for generating Doppler processed signals that are signals obtained by separating the reception signal according to Doppler frequencies or signals obtained based on the signals separated, an improvement level calculator for calculating a signal improvement level by comparing an amplitude value of the reception signal with amplitude values of the Doppler processed signals, a signal synthesizer for synthesizing the reception signal and the Doppler processed signals based on the signal improvement levels, and a display processor for generating a radar image based on the synthesized signal.