Deconvolution of Low Frequency Information From Signals Obtained With Ac Coupled Sensors

Stephan D. Price

doi:10.1117/12.959796

21 November 1980 Deconvolution of Low Frequency Information From Signals Obtained With AC Coupled Sensors

Stephan D. Price

Proceedings Volume 0264, Applications of Digital Image Processing to Astronomy; (1980) https://doi.org/10.1117/12.959796
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States

Abstract

The general considerations for a survey instrument are discussed. The infrared telescopes used by AFGL for the sky survey are ac coupled to minimize dynamic range requirements, scan and 1/f noise. However, this high pass filtering also attenuates signals from extended celestial sources. The process by which the effects of this filtering may be deconvolved from the data is briefly described. The problem at this stage is the familiar one of separating unwanted background and noise from the signal of interest. Reasonable separation of the the extraneous signal variations from the higher frequency signal of interest was obtained by sequentially smoothing the data in two coordinates over an interval of about one degree with a non-linear filter. A low resolution map which clearly shows large scale diffuse emission is a direct result of this smoothing. It was found possible to improve the resolution of the mapping with further processing to as high as the uncertainties associated with detector size and uniformity will allow.

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Stephan D. Price "Deconvolution of Low Frequency Information From Signals Obtained With AC Coupled Sensors", Proc. SPIE 0264, Applications of Digital Image Processing to Astronomy, (21 November 1980); https://doi.org/10.1117/12.959796

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KEYWORDS

Sensors

Electronic filtering

Infrared radiation

Deconvolution

Nonlinear filtering

Smoothing

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