Data Acquisition for a 16 CCD Drift-Scan Survey

Details Data Acquisition for a 16 CCD Drift-Scan Survey Data Acquisition for a 16 CCD Drift-Scan Survey

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110.1067s&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 751, pp. 1067-1080.

Astronomy and Astrophysics

Astronomy

15

Instrumentation: Detectors, Techniques: Image Processing, Methods: Data Analysis

Scientific paper

The QUEST (QUasar Equatorial Survey Team) collaboration is using an innovative 16 CCD mosaic camera at the prime focus of the 1 m Venezuelan Schmidt telescope to conduct a drift-scan survey of the equatorial sky (~4000 deg^2 with |b|>25). The data products, which consist of UBV photometry to m_B~21 and objective prism spectroscopy to m_B~19, will have various applications in addition to producing a homogenous sample of ~10^4 quasars. In this paper we describe the online data system, which is responsible for controlling the camera, and acquiring and managing ~30 GB of raw image data per night. The data system, designed to be highly scalable and cost effective (under $10,000), distributes the data I/O and processing in parallel across a cluster of commodity PC components. We currently use seven Pentium-class processors (75-133 MHz), interconnected with parallel Ethernet networks, running the QNX real-time, network-wide operating system. To ease the data handling, fast algorithms provide various levels of online analysis and data compression, including a new lossless compression scheme based on adaptive linear prediction.

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