Development of surface measuring system for large-diameter antennas using satellite signals.

利用卫星信号开发大直径天线表面测量系统。

基本信息

批准号：
60840001
负责人：
ISHIGURO Masato
金额：
$ 14.08万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research
财政年份：
1985
资助国家：
日本
起止时间：
1985 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60840001/
关键词：
Radio holography Millimeter-wave antenna 電波望遠鏡アンテナ

项目摘要

Large-diameter high-precision antenmas such as Nobeyama 45 m telescope and IRAM 30 m telescope have been used for millimeter and submillimeter wave radio astronomy. High-resolution surface mesurering techniques are very important to improve the surface accuracy of these antennas. Recently, radio holography is universally used for this purpose. But, the research has been needed to achieve highest possible accuracy in applying this technique to large-diameter antennas used for millimeter and submillimeter wave length.In this Grant-in-Aid for Developmental Scientific Research, a Radio holography system using geostationary satellite signals was developed. The system consists of 2-channel correlation receiver, control system, and softwares for data reduction. As a transmitter, radio beacon signals at 19.45 GHz from the Japanese communications satellites CS-2a and 2b were used. we succeeded in developing the system which has good phase stability, high sensitivity, and good isolation.By the use of this system, the surface of the 45 m telescope was measured 53 times in total in both 64x64 (resolution 86 cm) and 128x128 (resolution 43 cm) measurements in October 1985 and August 1986. Based on the measurements of best repeatability, the surface was adjusted and improved from 200 m rms to 150 m rms. Valuable results were obtained for future developments from the analysis of errors, experiments to reduce the effect of scattered wave, and computer simulations to investigate the effect of pointing error.

大直径高精度的天线，例如Nobeyama 45 M望远镜和IRAM 30 M望远镜，用于毫米和亚毫米波射电射线天文学。高分辨率的表面介绍技术对于提高这些天线的表面准确性非常重要。最近，广播全息图被普遍用于此目的。但是，需要进行这项研究以实现最高准确性，以将该技术应用于用于毫米和亚损波长度的大直径天线。发达。该系统由2通道相关接收器，控制系统和软件组成，以减少数据。作为发射器，使用了日本通信卫星CS-2A和2B的19.45 GHz的无线电信号。我们成功地开发了具有良好相位稳定性，高灵敏度和良好隔离的系统。通过使用该系统，在64x64（分辨率86 cm）和128x128中，总计45 m望远镜的表面总计53倍（（决议43厘米）的测量结果于1985年10月和1986年8月。根据最佳重复性的测量，将表面调整并从200 m rms提高到150 m rms。通过分析错误的分析，减少散射波的效果以及计算机模拟以研究指向误差的效果，获得了未来发展的宝贵结果。