Perform channel measurements at Wbands by means of a beacon designed, developed and launched on a Cubesat platform.
Augment ITU-R models for W-band with specific measurements such as
For large broadband satellite networks, the number of gateways may be such that the cost of the ground segment exceeds the cost of the satellite, even whenusing Q/V band in the gateway feeder link. The use of W-band as a feeder link frequency band in future HTS system could significantlyreduce the cost of the ground segment.
The usage of the spectrum available in W-band (70/80 GHz) for satellite communications will significantly reduce the number of gateways and consequently the overall cost of the ground segment. However, the channel models available from ITU are known to be accurate only until 30~40 GHz. Therefore new measurement campaigns are needed to characterize the channel propagation at W-band.
In this activity a Cubesat shall be used to embark a beacon in W-band in order to perform channel measurement experimentation. The LEO orbit of the Cubesat, although different from thegeostationary orbit of future operational satellites exploiting W-band, will allow to characterize fairly well all the major satellite channel impairments. In addition, supporting tools will beused to cope with the short contact times available for the measurements. In particular, an atmospheric channel simulator will be used to bridge the gap between the relatively short LEOmeasurements and the statistical reliability needed for GEO propagation measurements. The collected Cubesat channel measurements will be used to tune the atmospheric channelsimulator. Satellite movement effects will be de-convolved from measurements in order to extrapolate the equivalent GEO propagation channel.
The activity shall design and develop the W-band beacon together with the propagation terminal and the Cubesat platform that will host the beacon. Second, the beacon will be tested,integrated in the platform launched using the first flying opportunity. A measurement campaign ofat least two years duration shall follow.