Title :
A cryogenic microwave measuring system for satellite receiver testing
Author :
Sjöman, P. ; Hughes, N.J. ; Jukkala, P. ; Ovaska, S. ; Tuovinen, J. ; Kangaslahti, P. ; Eskelinen, P.
Abstract :
A cryogenic microwave test system for the 70 GHz Planck satellite receiver has been built. It consists of 4 K and 20 K active helium coolers mounted in large 2× 10-7 mbar vacuum chamber. Special RF-components have been designed for the test, e.g. a 4 K load for the continuous comparator reference temperature stimulus. External electronics has been constructed to measure the two orthogonal polarizations from two parallel receiver units. The noise temperature measurement uncertainty is better than 4 K and the test system´s post-detection noise characteristics with a matched load is better than 1.6·10-6 V/√Hz from 15 mHz, when the integration time constant is 0.5 s.
Keywords :
artificial satellites; astronomical instruments; cryostats; electric noise measurement; horn antennas; measurement uncertainty; microwave measurement; millimetre wave detectors; radiometers; space vehicle electronics; 20 K; 4 K; 70 GHz; Planck satellite; active helium coolers; continuous comparator reference temperature stimulus; cosmic microwave background measurements; cryogenic microwave measurement system; microwave components; noise temperature measurement uncertainty; orthogonal polarizations; parallel receiver units; radiometers; satellite receiver testing; space-probe receiver; vacuum chamber; Cryogenics; Electronic equipment testing; Helium; Microwave measurements; Polarization; Receivers; Satellite broadcasting; System testing; Temperature; Time measurement;
Conference_Titel :
Microwave Conference, 2003. 33rd European
Print_ISBN :
1-58053-834-7
DOI :
10.1109/EUMC.2003.1262223
