A High-precision Outfield Phase Calibration Method for Large Phased Array Radar
In order to solve the problem that the outfield phase calibration of large phased array radar cannot guarantee the calibration accuracy due to the influence of wind,a high-precision outfield phase grading calibration method is proposed.The laser calibration method is used to measure the sloshing curve and the maximum sloshing speed of the calibration source under wind load conditions.According to the radar operating frequency band and the calibration accuracy requirements,the minimum calibration duration guaranteeing the accuracy is calculated when the sloshing speed of the calibration source is maximum.The obtained minimum calibration duration is then used as the basis for the size division of the hierarchical subarray,and the full array outfield calibration is completed through multi-level calibration.The test results show that under the level 5 wind load condition,the root mean square(RMS)of the X-band phase calibration accuracy is less than 5.8°,and the maximum grating lobe level is reduced by 9 dB,which meets the accuracy requirements of the analog phase shifter.
large phased arrayhigh-precision phase calibrationgrading calibrationwind load conditioncalibration duration
国家科技期刊平台
NSTL
万方数据
维普
