Drive-control system for the TACTIC gamma-ray telescope

被引：11

作者：

Tickoo, AK ^{[1
]}

Koul, R ^{[1
]}

Kaul, SK ^{[1
]}

Kaul, IK ^{[1
]}

Bhat, CL ^{[1
]}

Bhatt, NG ^{[1
]}

Kothari, MK ^{[1
]}

Goyal, HC ^{[1
]}

Agarwal, NK ^{[1
]}

Kaul, SR ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Nucl Res Lab, Mumbai 400085, India

来源：

EXPERIMENTAL ASTRONOMY | 1999年 / 9卷 / 02期

关键词：

altitude-azimuth mounting; gamma-ray astronomy; TACTIC drive-control system;

D O I：

10.1023/A:1008090931239

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A PC-based drive-control system has been developed for the altitude-azimuth mounted TACTIC gamma-ray telescope to control the speed and direction of motion of its 2-axes. Details of various hardware components chosen for the telescope, including hybrid-stepper motor, 16-bit absolute encoder and CAMAC-based programmable stepper motor controller, are discussed in this paper. The telescope-control strategy, based on the position-loop with a proportional type control for the source-seek mode and the on/off type control for the tracking mode, is explained in detail. Some important performance features of the telescope, including its blind-spot size, drive-system backlash and encoder-error compensation, are also presented. The drive system has been extensively field-tested and has been operating satisfactorily during observation campaigns carried out since March 1997 with the TACTIC Imaging Element. A tracking accuracy of +/- 3 arc-minutes has been achieved. A test report of its performance, with regard to its tracking accuracy on the basis of successful detection of TeV gamma-rays from the active galaxy Markarian 501 in April-May 1997, is also presented.

引用

页码：81 / 101

页数：21

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