Polar Coordinate Radar Signal Processing for High-Speed Target Detection
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Solution Overview
Problem
Conventional radar signal processing methods, particularly those using scan correlation in orthogonal coordinate systems, face challenges in accurately discriminating targets moving at high speeds due to signal suppression and increased processing load, leading to unclear or missing target images on radar displays.
Innovation Solution
A radar signal processing device that performs scan correlation in the polar coordinate system, utilizing a signal acquirer, polar coordinate correlator, trend curve calculating module, and target detecting module to adjust correlation weights and output based on target detection, preventing signal suppression of high-speed targets by comparing signal levels with trend curves and using log and linear amplifiers for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If scan correlation is performed in orthogonal coordinate system, then clutter suppression is improved, but target detection accuracy deteriorates due to signal suppression and processing complexity
Solution Approach 1:
The patent inverts the conventional approach by performing scan correlation in the polar coordinate system (the original reception coordinate system) rather than converting to orthogonal coordinates. This inversion maintains the correspondence between reception data and antenna sweep, preventing signal suppression while achieving clutter suppression through correlation of signals from the same spatial locations across multiple scans.
Solution Approach 2:
The patent changes the parameter of coordinate system from orthogonal to polar, and dynamically adjusts correlation weights based on target detection results. When targets are detected, the correlation processing is modified to prevent suppression of high-speed targets, thereby improving measurement precision while maintaining clutter suppression capabilities.
2Object-affected harmful factors
If scan correlation is performed, then clutter suppression is improved, but high-speed target detection deteriorates due to signal suppression
Solution Approach 1:
The patent introduces dynamic adjustment of correlation processing based on target detection results. The correlation weights and processing mode are dynamically changed according to whether targets are detected and their movement characteristics, allowing the system to adapt between clutter suppression mode and high-speed target detection mode to improve productivity for moving targets.
Solution Approach 2:
The patent implements feedback by using target detection results to modify subsequent correlation processing. The detection module identifies targets and feeds this information back to the correlation module, which then adjusts its processing to prevent suppression of detected targets, especially high-speed moving targets, thereby improving target detection productivity.
3Device complexity
If coordinate conversion from polar to orthogonal system is performed, then image processing is simplified, but signal accuracy deteriorates due to interpolation and data selection
Solution Approach 1:
The patent inverts the conventional coordinate conversion approach by maintaining processing in the polar coordinate system throughout the scan correlation process. This avoids the harmful interpolation and data selection operations required for orthogonal coordinate conversion, preserving signal accuracy while managing complexity through efficient polar coordinate processing.
4Object-affected harmful factors
If conventional scan correlation is applied, then clutter suppression is improved, but target discriminability deteriorates due to signal suppression
Solution Approach 1:
The patent uses feedback from target detection to modify correlation processing, preventing loss of target information. When targets are detected, the system adjusts correlation weights and processing modes to preserve target signals while maintaining clutter suppression, thereby improving target discriminability without sacrificing clutter rejection capabilities.
Data Source
AI summary
A radar signal processing device is provided, which performs a scan correlation in a polar coordinate system to secure accuracy of the scan correlation, and prevents a suppression of a target object moving at high speed due to the scan correlation. A polar coordinate correlator performs, in a polar coordinate system, a correlation between reception data and previous correlated data stored in a previous data storage. A trend curve calculating module calculates a trend curve of a distance-direction signal level of the reception data in the polar coordinate system. A target detecting module detects a target based on the signal level of the reception data and the trend curve. Further, the polar coordinate correlator changes the contents of the correlation of the reception data based on the target detection result from the target detecting module.