A global calibration technique in use at the ETS

Details A global calibration technique in use at the ETS A global calibration technique in use at the ETS

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982stin...8326772r&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Calibrating, Instrument Errors, Telescopes, Atmospheric Refraction, Azimuth, Flexing

Scientific paper

This report describes the installation and results of a global calibration program introduced for both telescopes at the Lincoln Laboratory Experimental Test Site. The uncorrected positional pointing errors, due primarily to tube flexure, sag and astronomical refraction, were found to be as high as ten arc minutes at low (twenty degrees) elevation angles. The calibration is performed by a software program which contains look-up tables, for each telescope, that represent ten-degree increments of azimuth and elevation. Residual errors are now less than one arc minute except for a narrow zone across the northern sky. This is a region where there was a high gradient in the uncorrected errors and the residuals here, after correction, are a maximum of three arc minutes.

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