OPTICAL ALIGNMENT OF THE SPHERICAL ANTENNA MEASUREMENT SYSTEM

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Authors
  1. Brochu, C.J.
  2. Moffat, J.W.
  3. Morin, G.A.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
Precise range and positioner alignment are required for the accurate measurement of the radiation characteristics of microwave antennas using a spherical antenna measurement range. This report presents a custom designed system and novel techniques developed at DREO, based on optical instrumentation, to conveniently measure and monitor both the range alignment and the orthogonality and intersection of the multi-positioner spherical system axes. This system is an indoor spherical test range located in an anechoic chamber. The alignment hardware consists of several levels, an electronic theodolite with built-in autocollimation capability, and a unique target mirror assembly with the target viewable from both sides. A hand-held programmable calculator is also used to calculate angular positions and distances. Numerous techniques and procedures developed for optical alignment are described in detail. The user is guided through each step required for a precise optical alignment.
Keywords
Spherical near field measurement;DREO Antenna Measurement Acquisition Software (DAMAS)
Report Number
DREO-1316 — Technical report
Date of publication
01 Sep 1997
Number of Pages
90
DSTKIM No
98-00143
CANDIS No
506818
Format(s):
Hardcopy;Document Image stored on Optical Disk

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