Radar Azimuth Correction via Signal Normalization
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Solution Overview
Problem
Existing radar apparatuses face challenges in achieving accurate azimuth calculations due to gain and phase errors caused by electromagnetic coupling and variations in antenna element characteristics, particularly when using planar antennas with significant amplitude differences, leading to insufficient correction effects.
Innovation Solution
A radar apparatus and correction value calculation method that normalizes the received signal matrix by its average amplitude to remove error components based on beam patterns, allowing the signal to be corrected closer to an ideal isotropic signal, thereby improving azimuth calculation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If signal processing correction is performed on received signals using conventional methods, then some correction effect is obtained, but the correction is not sufficient and azimuth calculation accuracy remains limited
Solution Approach 1:
The patent changes the parameter of correction values by calculating them separately for each azimuth direction. Instead of using a single correction value for all directions, the system computes correction values specific to each azimuth angle based on the antenna beam pattern characteristics, thereby improving correction effectiveness and azimuth calculation accuracy
Solution Approach 2:
The patent segments the correction process by dividing the correction values into multiple sets corresponding to different azimuth directions. Each azimuth has its own correction value that accounts for the directional characteristics of the antenna elements, allowing for more precise correction than a unified approach
2Volume of moving object
If planar antennas are used to receive signals, then the antenna structure is compact, but significant amplitude differences occur among antenna elements leading to large error components
Solution Approach 1:
The patent applies local quality by assigning different correction values to different antenna elements based on their specific azimuth characteristics. Each antenna element's received signal is corrected using a correction value tailored to its directional properties, compensating for the amplitude differences inherent in planar antenna structures
Data Source
AI summary
A radar apparatus includes: a receiving unit including plural receiving antennas including an antenna element, and configured to receive incoming waves whose arrival directions are known; and a calculating unit configured to calculate a correction value for correcting an error component included in a received signal of the incoming waves received by the receiving unit based on the received signal, the correction value being depending on an azimuth of the antenna element.