Prowess-Ooty宽场阵列的软件模型
Prowess - a software model for the Ooty Wide Field Array
摘要：
Ooty宽场阵列（OWFA）的科学目标之一是观察z~3.35的红移HI发射。尽管预测在合理的整合时间内得出了乐观的结果，但这些研究纯粹基于分析假设，没有考虑到限制系统学。OWFA的软件模型已经开发，以了解仪器引起的系统学，通过描述一个完整的软件模型的仪器。这一模型是通过一套程序实施的，这些程序统称为Prowess，它具有模拟器和观测数据分析软件的双重作用。在构建Prowess时遵循的编程理念使任何用户都可以定义自己的一组功能并添加新功能。本文介绍了一种适用于OWFA的坐标系，在该坐标系中定义了基线。前景模拟从他们的角功率谱。然后从前景计算活力值。然后，这些vibrations用于进一步的处理，如校准和功率谱估计。该软件包允许以交互方式以多种输出格式提供丰富的可视化功能，让用户对数据有直观的感受。Prowess已被广泛用于OWFA HI实验前景的数值预测。
英文摘要：
One of the scientific objectives of the Ooty Wide Field Array(OWFA) is to observe the redshifted HI emission from z ~ 3.35. Although predictions spell out optimistic outcomes in reasonable integration times, these studies were based purely on analytical assumptions, without accounting for limiting systematics. A software model for OWFA has been developed with a view to understanding the instrument-induced systematics, by describing a complete software model for the instrument. This model has been implemented through a suite of programs, together called Prowess, which has been conceived with a dual role of an emulator as well as observatory data analysis software. The programming philosophy followed in building Prowess enables any user to define an own set of functions and add new functionality. This paper describes a co-ordinate system suitable for OWFA in which the baselines are defined. The foregrounds are simulated from their angular power spectra. The visibilities are then computed from the foregrounds. These visibilities are then used for further processing, such as calibration and power spectrum estimation. The package allows for rich visualisation features in multiple output formats in an interactive fashion, giving the user an intuitive feel for the data. Prowess has been extensively used for numerical predictions of the foregrounds for the OWFA HI experiment.
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