HALCA onboard VLBI observing system performance

被引：2
|
作者：
Kobayashi, H [1 ]
Wajima, K [1 ]
Hirabayashi, H [1 ]
Murata, Y [1 ]
Kawaguchi, N [1 ]
Kameno, S [1 ]
Shibata, KM [1 ]
Fujisawa, K [1 ]
Inoue, M [1 ]
Hirosawa, H [1 ]
机构：
[1] Inst Space & Astronaut Sci, Tokyo 153, Japan
来源：
VSOP RESULTS AND THE FUTURE OF SPACE VLBI | 2000年 / 26卷 / 04期
关键词：
D O I：
10.1016/S0273-1177(99)01175-8
中图分类号：
V [航空、航天];
学科分类号：
08 ; 0825 ;
摘要：
The space VLBI satellite HALCA was launched on February 12, 1997. It is the first Radio astronomy satellite. We report the performance of onboard radio astronomy system. Typical system noise temperatures are 70K and 90K at L and C band respectively. For K band, the apparent system noise temperature is 400 K. It is caused by the attenuation between the main antenna and the K band LNA. Bandpass characteristics of each observing band are almost the same as the ground test. The phase stability of local oscillators are around 5 degrees r.m.s. at C band. And the total gain of the receiving system and the bit distribution of high rate samplers are checked. Basically the in-orbit performance of the VLBI observing system matches the pre-launch ground:test results. (C) 2000 COSPAR. Published by Elsevier Science Ltd.
引用
收藏
页码：597 / 602
页数：6
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