Conclusions and Remarks

The Italian Space Agency has put a lot of effort and energy in developing hardware and software tools devoted to GNSS RO in the last decade. Currently its strategy is to cover all the steps of the processing chain from data acquisition down to enduser products and applications. It is acquainted with the possibilities that in the next decade the exploitation of the GNSS technique could boost dramatically research and operations in the field of climate and meteorology. ASI indeed wants to join the current international efforts aiming to make GNSS RO reliable and relevant for atmospheric remote sensing applications. The objective can be pursued using the large number of space missions currently devoted to GPS RO: CHAMP, GRACE, Formosat-3/COSMIC, MetOp, TerraSAR-X. ASI currently does not plan to have an own space mission devoted to RO where to embark ROSA receiver. Thus ASI is asking for installing it as an added payload on other international space missions just like the Indian OCEANSAT-2 and next Argentinian SAC-D. The main drawback of this approach, however, is that ROSA sometimes does not find a proper allocation on the satellite. The two high gain antennas indeed are quite big and they must be mounted only facing in turn the velocity and anti-velocity direction. Thus often there is no room to place the GPS RO antennas in a proper position. For this purpose ASI team is conceiving a space mission of dozen of mini-satellites fully devoted to GPS RO like Formosat-3/COSMIC. On the other hand ASI is strongly interested to use ROSA also in bistatic mode, i.e., able to catch the GPS signal reflected by the water surfaces. For this purpose the development of a next release of the software ROSA devoted to this kind of applications is planned as well as for the treatment of GPS RO from sub-orbital platforms.

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