Radar Digital Filter Distance-Based Magnification
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Solution Overview
Problem
Radar systems face challenges in displaying objects at varying distances with appropriate resolution, as the magnification factor is difficult to change and small vessels near the antenna are hard to see due to beam width limitations.
Innovation Solution
A data processing apparatus and method that adjusts the range of peripheral data used in digital filtering based on distance from the antenna, allowing for dynamic magnification by expanding or narrowing the influence of peripheral data, thereby changing the magnification factor according to the distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two-dimensional enlargement processing is applied to magnify images near the antenna, then the visibility of small vessels improves, but the device complexity increases and changing magnification factors becomes difficult
Solution Approach 1:
The patent changes the parameter of filter processing range according to distance from the antenna. By adjusting the range of peripheral data used in digital filtering based on distance, the system achieves dynamic magnification effect without complex procedures. Near objects use a smaller range while far objects use a larger range, enabling easy magnification factor adjustment through parameter modification rather than complex processing changes
2Device complexity
If a fixed beam width is used for radar transmission, then the antenna structure remains simple, but objects at different distances cannot be displayed with appropriate resolution
Solution Approach 1:
The patent applies local quality by using different filter processing ranges for different distance zones. Objects near the antenna are processed with a smaller peripheral data range, while objects farther away use a larger range. This creates locally optimized display quality for each distance zone, allowing appropriate resolution for both near and far objects without changing the physical antenna structure
Data Source
AI summary
A data processing apparatus that can set the magnification factor according to the distance from the antenna is provided so that the display of objects close to the antenna is easier to see and with which the changes in the settings of the magnification factor is easy. The buffer memory stores the digital signals converted by the A/D converter in association with the distance and azimuth with respect to the antenna. The digital filter filters the digital signals read from the buffer memory. A digital filter is provided that converts a value of data of interest, of digital data stored in the memory, to a value based on values of the data of interest to be processed and peripheral data in a periphery of the data of interest, and the digital filter changes a range of the peripheral data used for a filter processing according to the distance from the antenna to the data of interest.