The High Resolution Chirp Transform Spectrometer for the Sofia-Great Instrument |
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| Authors: | G Villanueva P Hartogh |
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| Institution: | (1) Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 3, 37191 Katlenburg-Lindau, Germany |
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| Abstract: | In this paper, we present the design of a high resolution Chirp Transform Spectrometer (CTS) which is part of the GREAT (German
REceiver for Astronomy at Terahertz frequencies) instrument onboard SOFIA, the Stratospheric Observatory For Infrared Astronomy.
The new spectrometer will provide unique spectral resolving power and linearity response, since the analog Fourier transform
performed by the CTS spectrometer was improved through a new design, that we call “Adaptive Digital Chirp Processor (ADCP)”.
The principle behind the ADCP consists on digitally generating the dispersive signal which adapts to the compressor dispersive
properties, achieving maximum spectral resolution and higher dynamic range. Excellent test results have been obtained such
as a white noise dynamic range of 30 dB, and a spectral resolution (FWHM) of 41.68 kHz which would mean if analyzing signals
with the high frequency band receiver on the GREAT instrument (4.7 THz) a spectral resolving power (λ/Δ λ) higher than 108. |
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| Keywords: | Radio Astronomy High Resolution Spectroscopy Chirp Transform Spectrometer Radiometers Heterodyne Instrumentation |
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