中国科学院新疆天文台机构知识库

本发明公开了一种基于轨道不平度的大型轮轨式天线指向均方根误差的计算方法，包括测量天线服役时轨道采样点的高度值，确定天线座架坐标系，对轨道各点高度值进行坐标变换，对轨道不平度进行拟合，采用两种方法计算由轨道不平度引起的天线波束指向均方根误差，一是先计算单一俯仰角下的指向均方根误差，再对所有俯仰角下的这些误差求其均方根，另一种是先计算某一方位角、俯仰角下的指向误差，再对所有方位角、俯仰角下的这些误差求其均方根。本发明不仅真实反映了天线轨道表面，而且能准确计算大型轮轨式天线在指向定义域内因轨道不平度而引起的波束指向均方根误差，用于定量评价轨道不平度对天线性能的影响，具有重要的学术意义和工程应用价值。

The invention discloses a track irregularity-based large wheel track antenna pointing root mean square error calculating method. The method comprises the following steps: measuring the height value of a track sampling point in the service process of an antenna; determining the coordinate system of an antenna mount; carrying out coordinate transformation on the height values of all points of the track; fitting track irregularity; and calculating the antenna pointing root mean square error caused by track irregularity through adopting two processes: calculating the pointing root mean square errors under a single pitch angle and solving the root mean square of the errors under the pitch angle, and calculating the pointing error under one azimuth and pitch angle, and solving the root mean square of errors under all azimuths and pitch angles. The method truly reflects the antenna track surface, can accurately calculate the wave beam pointing root mean square errors caused by the track irregularity of the large wheel track antenna in a pointing domain, is used for quantitatively evaluating the influences of the track irregularity on the performances of the antenna, and has great science meaning and engineering application values.