A DIGITAL CORRELATION RECEIVER FOR THE GEETEE RADIO TELESCOPE

被引：9
|
作者：
SHANKAR, NU
SHANKAR, TSR
机构：
[1] Raman Research institute, Bangalore
来源：
JOURNAL OF ASTROPHYSICS AND ASTRONOMY | 1990年 / 11卷 / 03期
关键词：
DSB system; one-bit correlator;
D O I：
10.1007/BF02709280
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
A 128-channel digital correlation receiver has been built for the GEETEE 1, the low-frequency radio telescope situated at Gauribidanur, South India, (latitude 13°36′12′′ N). The receiver uses a modified doublesideband (DSB) technique. The quadrature samples required for a DSB system are obtained by sampling the digitized intermediate frequency (I.F.) signals by two clocks which are separated in time by one quarter of the period of the I.F. The visibilities required for one-dimensional synthesis are measured using one-bit correlators. A technique to measure amplitude information for the signal using a threshold detector and a one-bit correlator has been developed. The receiver has been successfully used for continuum, spectral-line and pulsar observations. The antenna system of GEETEE and its configuration for one dimensional synthesis are also described in this paper © 1990 Indian Academy of Sciences.
引用
收藏
页码：297 / 310
页数：14
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