Mode-Specific Pushing Windows for Radar Spectral Leakage
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Solution Overview
Problem
Conventional windowing techniques in multi-mode radar systems suffer from spectral leakage and trade-offs between spectral leakage and angular resolution, which are inadequate for effectively determining the angular locations of objects.
Innovation Solution
The use of mode-specific pushing windows for windowing object data prior to the angle detection transform, which are designed to minimize spectral leakage and maintain high angular resolution by matching the combined angular coverage field of view of the transmit and receive antennas, thereby reducing spectral leakage into regions with high tolerance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional windowing techniques are used in multi-mode radar systems, then the processing is simple and straightforward, but spectral leakage occurs and angular resolution deteriorates
Solution Approach 1:
The patent segments the windowing approach by mode, creating different window functions (e.g., first window for long-range mode, second window for short-range mode) tailored to specific radar operating modes. Each mode-specific window is optimized for its particular angular coverage field of view, allowing the system to achieve both low spectral leakage and high angular resolution without using a single compromise window for all modes.
Solution Approach 2:
The patent applies local quality by designing window functions with specific spectral characteristics matched to local requirements of each radar mode. The first window has spectral characteristics optimized for the long-range mode's angular coverage, while the second window is optimized for the short-range mode's angular coverage. This allows each region (mode) to have the quality (spectral leakage suppression and resolution) it needs without compromising other regions.
2Adaptability or versatility
If a fixed window is used across all radar modes, then device complexity is reduced, but the window cannot adapt to different angular coverage fields of view, worsening measurement precision
Solution Approach 1:
The patent implements dynamics by making the window function adaptive to the current radar operating mode. The system dynamically selects the appropriate window function based on whether the radar is in long-range or short-range mode, allowing the processing characteristics to change according to operational requirements. This dynamic adaptation enables the system to optimize performance for each mode without requiring a completely different processing system for each mode.
Data Source
AI summary
A multi-mode radar system, radar signal processing methods and instruction-based radar signal processing are provided. In an example, such processing includes using range/mode-specific pushing windows to perform windowing on range and velocity object data before performing an angle transform on the windowed object data matrix to generate a three-dimensional object matrix including range, velocity and angle data. The individual windows have an angular spectral response that corresponds to a combined angular coverage field of view of the transmit and receive antennas for the corresponding mode to minimize the total weighted energy outside the main lobe and to provide increasing spectral leakage outside the combined angular coverage field of view with angular offset from the main lobe to push out much of the spectral leakage into regions where leakage tolerance is high due to the corresponding combined angular coverage field of view of the transmit and receive antennas.