A method and system for calibration and monitoring of phased array radar based on fiber optic time delay

The phased array radar calibration and monitoring system based on fiber optic time delay solves the problem of insufficient calibration stability of phased array weather radar, realizes quantitative evaluation and long-term monitoring of radar system, and improves radar detection accuracy and weather forecast accuracy.

CN122307486APending Publication Date: 2026-06-30长沙气象雷达标校中心
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
长沙气象雷达标校中心
Filing Date
2026-06-01
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing phased array weather radar calibration methods lack stability, are easily affected by external conditions, and lack effective beam evaluation methods and long-term monitoring methods, which affect radar detection accuracy and weather forecast accuracy.

Method used

A phased array radar calibration and monitoring system based on fiber optic time delay is adopted, including a transceiver module, a fiber optic time delay module, and a measurement module. The fiber optic time delay module measures the actual physical distance between the radar and the horn antenna and the internal loss of the system, adjusts the radar beam main lobe center to align with the horn antenna, calculates the reflectivity factor, and performs quantitative evaluation.

Benefits of technology

It enables systematic calibration and long-term monitoring of phased array weather radar, assesses the performance differences of different beams, improves radar detection accuracy and stability, and ensures the accuracy of weather forecasts.

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Abstract

This invention discloses a phased array radar calibration and monitoring method and system based on fiber optic time delay, relating to the field of phased array weather radar data processing and calibration technology. It includes setting up a calibration system in the far field, comprising a fiber optic time delay module, a transceiver module, and a measurement module. A fixed time delay is introduced using fiber optics, making the distance of the echo in the radar base data much larger than the actual physical distance, thus avoiding interference from ground objects. A formula for calculating the reflectivity factor reference value considering atmospheric loss compensation error is derived, and absolute calibration is achieved by comparing the radar's measured values ​​with the theoretical reference value. The radar's mechanical elevation angle is adjusted so that beams with different normal deviation angles point towards the calibration system, and the echo intensity is extracted to assess the performance differences of each beam. Through long-term extraction of echo intensity in calibration mode or service mode, combined with system loss, stability parameters are calculated and time series are analyzed to achieve long-term monitoring and early warning of radar stability.
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