摘要
射电日像仪是采用综合孔径方法成像,具有高时间、高空间和高频率分辨率的太阳专用射电望远镜.为了使信号相关值准确,需要精确测量系统的延时,在太阳成像相关前扣除,消除消调函数对可见度函数值的影响.同时延时的测量精度影响数字补偿精度、图像信噪比等信息,是其成像质量的关键,也是超宽频带和高时间分辨率情况下研制和实施的难点.本文研究了应用于我国在建的厘米——分米波射电日像仪,以太阳为校准源,闭合差方法得到系统延时差,并通过试验验证,得到优于1ns补偿精度.
The Chinese Spectral Radioheliograph(CSRH) is a solardedicated radio interferometric array that will produce high spatial resolution,high time resolution and high frequency resolution images of the sun simultaneously in cm-dm wave range.The quality of the calibration is the key for imaging especially for the case of ultra-wideband,high time resolution and frequency resolution in design and implementation.In this paper,we choose the sun as calibration source and calculate the delay for different geographical latitude and longitude.As a result,the delay accuracy that we got is better than 1ns.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2013年第3期570-574,共5页
Acta Electronica Sinica
基金
国家重大科研装备研制项目(No.ZDYZ2009-3)
国家自然科学基金(No.11003028)
关键词
综合孔径
太阳
系统延时
校准
误差
synthesis aperture
solar
system delay
calibration
error