Planet Signal Extraction for the Terrestrial Planet Finder Interferometer
Planet Signal Extraction for the Terrestrial Planet Finder Interferometer
复制标题
类地行星探测器干涉仪的行星信号提取
DOI：
10.1086/499528
复制
发表时间：
2006
期刊：
影响因子：
--
通讯作者：
B. Ware
中科院分区：
文献类型：
--
作者：
D. Draper;N. M. Elias II;M. Noecker;P. Dumont;O. Lay;B. Ware
信号提取是科学与系统工程要求之间的重要环节。在本文中，我们提出了一个类地行星射电望远镜（TPF）干涉仪行星信号提取算法，并证明了几个调零干涉仪的设计规范TPF天文场景的性能。我们创建的输出响应的线性相位斩波双Bracewell调零干涉仪和矩阵版本的相关方法产生脏图像。我们推导出一般和具体的地图参数，如信噪比，信号与伪影比，检测置信度，用于个人地图或比较阵列架构。我们实现了一个矩阵形式的CLEAN，删除地图文物，产生重建图像，并检索行星信号。Monte Carlo模拟表明，一些固定长度的结构连接的干涉仪配置可以检测系统在10 pc的恒星泊松噪声的存在下，类地行星。由于角分辨率取决于基线长度，因此可以针对每个特定场景改变阵列配置的设计上级具有固定阵列长度的干涉仪。因此，与固定长度的结构连接架构相比，灵活的自由飞行架构应该满足更多TPF候选者的科学要求。
Signal extraction is a vital link between science and systems-engineering requirements. In this paper we present a Terrestrial Planet Finder (TPF) interferometer planet-signal-extraction algorithm and demonstrate the performance of several nulling-interferometer designs on canonical TPF astronomical scenes. We create the output response of a linear phase-chopping dual Bracewell nulling interferometer and a matrix version of the correlation method employed to generate dirty images. We derive general and specific map parameters, such as signal-to-noise ratio, signal-to-artifact ratio, and detection confidence, used for individual maps or comparing array architectures. We implement a matrix form of CLEAN that removes map artifacts, produces reconstructed images, and retrieves planetary signals. Monte Carlo simulations show that some fixed-length structurally connected interferometer configurations can detect Earth-like planets for systems at 10 pc in the presence of stellar Poisson noise. Since angular resolution depends on baseline length, a design that can vary array configuration for each specific scene is superior to an interferometer with a fixed array length. Thus, a flexible free-flying architecture should satisfy the science requirements for more TPF candidates, compared to a fixed-length structurally connected architecture.