一种方位及俯仰可调控制平台的实现

微波接收机是射电望远镜中专门用于接收射电信号的设备，而强度校准的目的是将接收到的射电信号响应等效地转换为天文意义上的流量密度。由于毫米波校准还易受到大气吸收作用，因此对大气不透明度的测试尤为重要。文中通过搭建机械转动平台及其控制系统，可以精确实现7 mm 波段常温接收机在目标方位下进 行0°~ 90°俯仰扫描观测。通过控制软件并行记录在不同仰角下的接收机输出功率，结合大气辐射转移方程，采用非线性最小二乘拟合的方式，最终得到当前方位7 mm 波段实时的大气不透明度值，很好地实现了精确控制及自动测试功能。

Realization of an Azimuth and Elevation Adjustable Control Platform

Microwave receiver is special equipment for receiving radio signal in radio telescope and the purpose of amplitude calibration is to equivalently convert the response of the received radio signal to astronomical flow density. Since millimeter wave calibration is also susceptible to atmospheric absorption, the measurement of atmospheric opacity is particularly important. In this paper, by building the mechanical rotation platform and its control system, the 7 mm band normal temperature receiver can accurately realize the 0° ~ 90° pitch scanning observation at the target azimuth. The output power of the receiver in different elevation angles can be recorded in parallel by the control software. Combined with the atmospheric radiation transfer equation, the nonlinear least square fitting method is adopted to finally obtain the current azimuth 7 mm band real-time atmospheric opacity value. The precise control and the automatic test function are well realized.