DBF + LFMCW system zero intermediate frequency radar amplitude-phase high-precision closed-loop near-field calibration system and method
By combining the DBF+LFMCW zero-IF radar with a target echo simulator and darkroom components, high-precision calibration of the radar receiving channel is achieved, solving the problems of high cost and insufficient accuracy of traditional UAV detection, and is suitable for low-cost UAV detection systems.
CN120595244APending Publication Date: 2025-09-05LINGBAYI ELECTRONICS GRP
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Patent Information
- Application Number
- CN202510936526.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-08
- Publication Date
- 2025-09-05
AI Technical Summary
Technical Problem
Traditional drone detection methods are expensive and lack accuracy. Traditional near-field calibration methods cannot meet the needs of high-precision angle measurement. Far-field testing is expensive and affected by antenna size.
Method used
A DBF+LFMCW zero-IF radar is used, combined with a target echo simulator and darkroom components. Through frequency synthesis, power amplification, darkroom probe adjustment and channel amplitude and phase correction algorithms, high-precision calibration of the radar receiving channel is achieved.
Benefits of technology
It achieves high-precision calibration of the radar receiving channel, reduces costs, and improves the accuracy and reliability of UAV detection. It is suitable for receiving antenna testing in darkroom environments.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a DBF + LFMCW system zero intermediate frequency radar amplitude-phase high-precision closed-loop near-field calibration system and method. The method comprises the following steps: generating a test signal through a target echo simulator; a test signal is connected to a darkroom probe and is aligned with a certain receiving antenna of the radar, the radar equipment assembly receives the signal and mixes the signal with an internal local oscillator signal to obtain a zero intermediate frequency signal received by the channel, and meanwhile, the amplitude and the phase of the zero intermediate frequency signal are periodically collected and output to a terminal interface; a darkroom probe is controlled to be sequentially aligned with 1-N channels of a radar receiving antenna, zero intermediate frequency signals of each channel are collected and stored, recorded zero intermediate frequency data of all the channels are processed through a channel amplitude phase correction algorithm, and accurate correction of each channel is achieved. According to the invention, the baseband I / Q signals are directly collected and processed, so that accurate compensation of I / Q amplitude-phase inherent errors of each channel caused by DC offset, processing technology and the like can be realized.
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