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Title: Sideband characterization and atmospheric observations with various 340 GHz heterodyne receivers

This paper describes sideband response measurements and atmospheric observations with a double sideband and two Single Sideband (SSB) receiver prototypes developed for the multi-beam limb sounder instrument stratosphere-troposphere exchange and climate monitor radiometer. We first show an advanced Fourier-Transform Spectroscopy (FTS) method for sideband response and spurious signal characterization. We then present sideband response measurements of the different prototype receivers and we compare the results of the SSB receivers with sideband measurements by injecting a continuous wave signal into the upper and lower sidebands. The receivers were integrated into a total-power radiometer and atmospheric observations were carried out. The observed spectra were compared to forward model spectra to conclude on the sideband characteristics of the different receivers. The two sideband characterization methods show a high degree of agreement for both SSB receivers with various local oscillator settings. The measured sideband response was used to correct the forward model simulations. This improves the agreement with the atmospheric observations and explains spectral features caused by an unbalanced sideband response. The FTS method also allows to quantify the influence of spurious harmonic responses of the receiver.
Authors:
;  [1] ;  [2] ; ;  [3]
  1. Institute of Applied Physics, University of Bern, Bern (Switzerland)
  2. STFC Rutherford Appleton Laboratory, Didcot, Oxfordshire (United Kingdom)
  3. OMNISYS Instruments, Västra Frölunda (Sweden)
Publication Date:
OSTI Identifier:
22314428
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 8; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; CLIMATES; FOURIER TRANSFORM SPECTROMETERS; GHZ RANGE 100-1000; HETERODYNE RECEIVERS; OSCILLATORS; RADIOMETERS; SIGNALS; SIMULATION; SPECTRA; STRATOSPHERE; TROPOSPHERE