AMiBA六足望远镜的平台变形精对准和相位校正
Platform Deformation Refined Pointing and Phase Correction for the AMiBA Hexapod Telescope
摘要：
微波背景各向异性阵列（英语：Array for Microwave Background Anisotropy，缩写为AMiBA）是一个用于宇宙学研究的射电干涉仪，目前运行着7个直径为0.6米的天线，它们共同安装在一个由六足支架驱动的直径为6米的平台上。AMiBA是目前最大的六足望远镜。我们简要总结了六足操作与当前的指向误差模型。然后，我们将重点关注即将到来的13元素扩展及其潜在的困难和解决方案。平台的摄影测量揭示了一定程度的变形，这可能会影响光学指向和接收器无线电相位。为了准备13元素升级，平台上安装了两台光学望远镜，以进行相关光学指向测试。安装在不同的位置上，两组指向误差的残差显示出作为平台变形模式的函数的特征相位和幅度差。这些结果取决于望远镜的方位角、仰角和偏振位置。为了将局部变形引起的误差从实际的六足机器人指向误差中分离出来，建立了变形的解析模型。同样，我们证明了变形引起的无线电相位误差可以可靠地建模和校准，这使我们能够恢复理想的合成波束的振幅和形状高达90%或更多。由此产生的阵列效率及其限制进行了讨论的基础上推导出的误差。
英文摘要：
The Array for Microwave Background Anisotropy (AMiBA) is a radio interferometer for research in cosmology, currently operating 7 0.6m diameter antennas co-mounted on a 6m diameter platform driven by a hexapod mount. AMiBA is currently the largest hexapod telescope. We briefly summarize the hexapod operation with the current pointing error model. We then focus on the upcoming 13-element expansion with its potential difficulties and solutions. Photogrammetry measurements of the platform reveal deformations at a level which can affect the optical pointing and the receiver radio phase. In order to prepare for the 13-element upgrade, two optical telescopes are installed on the platform to correlate optical pointing tests. Being mounted on different locations, the residuals of the two sets of pointing errors show a characteristic phase and amplitude difference as a function of the platform deformation pattern. These results depend on the telescope's azimuth, elevation and polarization position. An analytical model for the deformation is derived in order to separate the local deformation induced error from the real hexapod pointing error. Similarly, we demonstrate that the deformation induced radio phase error can be reliably modeled and calibrated, which allows us to recover the ideal synthesized beam in amplitude and shape of up to 90% or more. The resulting array efficiency and its limits are discussed based on the derived errors.
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