Digital array radar amplitude-phase monitoring and calibration method based on optical fiber delay system

Abstract

The invention relates to a digital array radar amplitude-phase monitoring and calibration method based on an optical fiber delay system. The method mainly includes the steps that a radar array front array element and an array front monitoring coupled array element are utilized to collect amplitude-phase data of all uplink channels and all downlink channels of the radar array front array element in a mutual coupling mode, amplitude-phase monitoring of all the uplinks and the downlinks of a radar array front is finished, when amplitude-phase correction and calibration need to be conducted on the array front, the difference value between the amplitude-phase data and factory data is acquired through amplitude-phase monitoring, and then amplitude-phase calibration of the uplinks and the downlinks of the array front is finished after the difference value is corrected. According to the method, the optical fiber delay system is introduced to separate transmitting time from receiving time, within a transmitting monitoring operation time sequence, the monitored channels work in a deep blanking state, optical fiber amplitude-phase drifting self-calibration is finished, and accuracy of monitored data is guaranteed. The method has the advantages of being good in real-time performance, convenient and quick to operate, and good in cost performance. The presentation and engineering realization of the method have high practical application value in the field of digital array radar monitoring and calibration.

Description

technical field [0001] The invention belongs to a digital array radar monitoring and calibration method, which is applied to the amplitude and phase monitoring and calibration of the digital array radar array, and improves the accuracy and operability of the digital array radar amplitude and phase monitoring and calibration. Background technique [0002] At present, the monitoring and calibration methods of digital array radar mainly include: planar near-field calibration method, field direct measurement method, commutation measurement method, far-field monitoring method and internal monitoring method. The planar near-field calibration method is accurate in testing, but requires a heavy and precise mechanical scanning frame system, and the efficiency is very low; the field direct measurement method and the far-field monitoring method have a small amount of equipment, but they need to assume auxiliary antennas in the field and far fields; The monitoring method is mainly suita...

AI Technical Summary

Problems solved by technology

However, the life cycle of radar in practical applications is relatively long. In the long-term use process, the inconsistency between the channels of the phased array antenna will gradually accumulate, and the system error will continue to increase. When the error is large to a certain extent, the performance of the antenna will deteriorate. Significantly decreased, affecting the overall performance of the radar

Therefore, it is necessary to be able to monitor the status of each channel in real time, but if the method of assuming an auxiliary antenna is used for each calibration, it will increase the difficulty of calibration and it is not easy to operate and realize on the ship

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