摘要
本文作者研制了一个大角锥喇叭天线和两个黑体箱,利用它测量了9375MHz频率上的太阳射电流量和校准了抛物面天线的增益.@@@@流量定标期间,角锥喇叭天线测得的流量与TYKW 9400MHz频率上的结果基本上一致,两者偏差约为±0.6%.流量测量精度为±3.5%(偶然差±1.3%,系统差±2.2%).@@@@抛物面天线增益为40.50±0.02db,抛物面天线温度与流量的转换因子为0.3139,按它计算的常规观测流量值与TYKW相比,比值为1.01,相关系数为0.95.@@@@测量结果表明:用最佳角锥喇叭天线观测太阳,和用两个不同温度的黑体源于天线口面进行温度定标,是太阳射电流量绝对定标和抛物面天线增益校准的最好最可靠的方法.
We have developed a large pyramidal horn and two black-body boxes to measure solar radio fluxes and to correct the gain of a paraboloid antenna at 9375MHz. During the absolute calibration, we obtained solar radio fluxes with an optimal pyramidal horn at 9375MHz. They roughly agree with the values of TYKW at 9400MHz. The difference between them is±0.6%. The measuring accurcy of the fluxes is ±3.5% (the accidental error is ±1.3% and the systematic error is ±2.2%). The gain of para'boloid antenna is 40.50±0.02db. The factor that converts antenna temperature into radio flux is 0.3139. Then we compared the computed solar radio fluxes based on the converting fector with flux density from TYKW at 9400MHz, and obtained the ratio of S_(9400)/S_(9375) equal to 1.01. The correlation coefficient is 0.95. The results stated above indicate that using an optimal pyramidal horn to observe the sun and two black bodies with different temperatures as the temperature standards at the aperture plane of the horn is the best and most reliable method for absolute calibration of both solar radio emissive fluxes and a antenna gain.
出处
《天文学报》
CSCD
北大核心
1991年第3期239-246,共8页
Acta Astronomica Sinica
基金
国家和院基金
关键词
太阳
射电流量
测量
Sun—radio flux—absolute measurement
