DocumentCode
2065333
Title
Space Qualification of the Radioastron 22 GHz Receiver
Author
Piironen, P. ; Mallat, J. ; Rasanen, A. ; Siivola, E. ; Takala, J. ; Jukkala, P. ; Sailamäki, P. ; Somerma, H. ; Ylinen, J.
Author_Institution
Helsinki University of Technology, Radio Laboratory, Otakaari 5 A, SF-02150 Espoo, Finland
Volume
1
fYear
1992
fDate
5-9 Sept. 1992
Firstpage
305
Lastpage
310
Abstract
The Radioastron space VLBI satellite, expected to be launched in 1995, will have on board four sensitive two-channel radiometers. Finland is responsible for the 22 GHz receiver. The most important properties of the receiver are sensitivity, phase stability and gain stability. To reach maximum sensitivity, a modern space qualified low noise HEMT amplifier has been designed. The measured receiver noise temperature is 140 K. For maximum phase and amplitude stabilities, temperature stabilisation and a high Q dielectric resonator oscillator design have been utilized. The measured phase stability is better than 3 o/h. The main aspects of the space qualification tests and the reliability analysis are described.
Keywords
Dielectric measurements; HEMTs; Low-noise amplifiers; Phase measurement; Qualifications; Radiometers; Satellite broadcasting; Stability; Temperature measurement; Temperature sensors;
fLanguage
English
Publisher
ieee
Conference_Titel
Microwave Conference, 1992. 22nd European
Conference_Location
Helsinki, Finland
Type
conf
DOI
10.1109/EUMA.1992.335685
Filename
4135468
Link To Document