高精度紧缩场扫描架的研制

Development of a high precision scanning frame for compact antenna test range

高精度紧缩场扫描架是高频率微波紧缩场验收和定期标定的关键设备之一,其微波接收头运动扫描平面要求具有高的平面度。本扫描架采用横、纵直线导轨的直角坐标运动结构,并特别在装载微波接收头的小车上设计了能够沿微波运动方向进行微量补偿调节的微调机构,实时根据接收头原始位置误差值进行反向补偿修正。测试结果表明此扫描架达到的扫描平面度小于0.04mm,能够适应于高于100GHz高频率紧缩场的检测工作。

High precision scanning frame is one of key equipments for testing a new CATR（ Compact Antenna Test Range） and regularly calibrating a CATR which has been using. The scanning plane that formed by the movement of microwave sensor should have a high precision planeness. A high precision scanning frame with right - angle coordinate movement style is developed. A precision adjusting mechanism is designed on the slide block which carries the microwave sensor, and it is used to compensate position error of the mi- crowave sensor along microwave moving direction. It is indicated by the testing results that the planeness of this scanning frame is less than O. 04mm, and it can be used to test the CATR with the frequency of more than 100GHz.