Measurement of the Odin telescope at 119 GHz with a hologram-type CATR

Ala‐Laurinaho, Juha; Hirvonen, T.; Piironen, P.; Lehto, A.; Tuovinen, J.; Räisänen, Antti V.; Frisk, U.

doi:10.1109/8.947017

Cited by 46 publications

(10 citation statements)

References 6 publications

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“…The setup was described by Ala-Laurinaho et al (2001). Comparison between the theoretical and the measured quiet-zone fields of the hologram CATR demonstrated the correctness of the analysis method and also the importance of high quality physical joints between the hologram parts.…”

Section: Hologram Test Of Telescopementioning

confidence: 90%

The Odin satellite

Frisk¹,

Hagström²,

Ala‐Laurinaho³

et al. 2003

A&A

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187

103

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Abstract. The Sub-millimetre and Millimetre Radiometer (SMR) is the main instrument on the Swedish, Canadian, Finnish and French spacecraft Odin. It consists of a 1.1 metre diameter telescope with four tuneable heterodyne receivers covering the ranges 486−504 GHz and 541−581 GHz, and one fixed at 118.75 GHz together with backends that provide spectral resolution from 150 kHz to 1 MHz. This Letter describes the Odin radiometer, its operation and performance with the data processing and calibration described in Paper II.

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Section: Hologram Test Of Telescopementioning

confidence: 90%

The Odin satellite

Frisk¹,

Hagström²,

Ala‐Laurinaho³

et al. 2003

A&A

Self Cite

187

103

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“…[3], or a hologram, e.g. [4]. CATRs enable the antenna measurements indoors in plane wave conditions, i.e., the radiation pattern can be directly measured by rotating the AUT.…”

Section: Compact Antenna Test Rangementioning

confidence: 99%

Antenna Measurements at Millimeter Wavelengths - Overview

Räisänen¹,

Zheng²,

Ala‐Laurinaho³

et al. 2018

12th European Conference on Antennas and Propagation (EuCAP 2018)

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“…The 118 GHz radiometer is designed as a single sideband (SSB) with system noise of 1000-1600 K; others are a double sideband (DSB) with a noise temperature of 900-18,000 K. The backend includes four kinds of spectrometers (12 wideband filter banks, five medium bandwidth filter banks, 19 standard filter banks, and four autocorrelation spectrometers), which adopt different spectrum resolutions and bandwidths to cover different height ranges, and the spectrum resolution is 0.15-500 MHz [7][8][9]. Odin is a joint mission satellite of upper atmospheric physics and astronomy, which includes a sub-millimeter radiometer (SMR) [10]. Odin-SMR was the first limb sounding system to be cooled by a constant temperature refrigerator in space.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the Spectrum Response for the THz Atmosphere Limb Sounder (TALIS)

Duan

Wang

et al. 2020

Sensors

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The THz atmospheric limb sounder (TALIS) is a microwave radiometer developed by the National Space Science Center of the Chinese Academy of Sciences for the detection of atmospheric trace gases. The observation range of the instrument mainly focuses on the middle and upper atmosphere (10–100 km above the earth’s surface). The detection targets include the temperature, pressure, and more than 10 kinds of atmospheric components. Its scientific goal is to improve our comprehension of atmospheric chemical composition and dynamics, and to monitor environmental pollution and sources in the atmosphere. The TALIS instrument is composed of an antenna, superheterodyne radiometers, and digital fast Fourier transform (FFT) spectrometers. By measuring the atmospheric thermal radiance in the wide frequency band with 118, 190, 240, and 643 GHz as the center frequency, the required volume mixing ratio (VMR) of atmospheric chemical species can be obtained. This paper introduces the characteristics of the TALIS instrument, and establishes a simulation model for the TALIS spectrometer. Through a joint simulation with an atmosphere radiative transfer simulator (ARTS), the TALIS instrument performance is evaluated from the aspects of calibration, the imbalance of two sidebands, the spectrum resolution, and quantization. The simulation results show that the two-point calibration can well-restore the radiance spectrum of the scene target and remove the influence of the spectral response function (SRF); the double side band (DSB) receiver with a 2 MHz resolution can meet the sensitivity and spectrum resolution requirements. Finally, the sensitivity errors of different quantization bits are given by the simulation and the results show that at 8-bit, the sensitivity and its degradation ratio are 1.251 K and 1.036 at a 2 MHz spectrum resolution and 100 ms integration time, respectively.

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Measurement of the Odin telescope at 119 GHz with a hologram-type CATR

Cited by 46 publications

References 6 publications

The Odin satellite

The Odin satellite

Antenna Measurements at Millimeter Wavelengths - Overview

Simulation of the Spectrum Response for the THz Atmosphere Limb Sounder (TALIS)

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