A novel FSS-Backed reflectarray unit cell is introduced to design a dual-band X/Ku Reflectarray Antenna (RA). A Kuband RA based on this FSS-Backed cell element is designed and located on the top of a conventional X-band RA. Actually, the band-stop Frequency Selective Surface (FSS) property is applied to a wideband element to create isolation between X and Ku band RAs which utilizing the same ra...

National Aeronautics and Space Administration (NASA) has developed a space-qualified, reprogrammable, Ka-band Software Defined Radio (SDR) to be utilized as part of an onorbit, reconfigurable testbed. The testbed will operate on the truss of the International Space Station beginning in late 2012. Three unique SDRs comprise the testbed, and each radio is compliant to the Space Telecommunications...

In this paper, precipitation rate retrieval algorithms for the Global Precipitation Measurement mission's Dual-frequency Radar (DPR) are developed. The DPR consists of a Ku-band radar (KuPR; 13.6 GHz) and Ka-band (KaPR; 35.5 GHz). For KuPR, an algorithm similar to Tropical Rainfall Measuring Mission's is developed, with relation between R massweighted mean diameter Dm (R?Dm relation) replacing ...

AbstructThe space shuttle orbiter (SSO) Ku-band single access return (KSAR) link and the space station freedom (SSF) KSAR link' via the tracking and data relay satellite system (TDRSS) use the same carrier frequency. The interference between spacecraft is minimized by opposite antenna polarizations and by TDRSS antenna beam pointing, but if the SSF and SSO are in close proximity, it is expected...

The National Aeronautics and Space Administration (NASA) through the Jet Propulsion Laboratory (JPL) has been involved in the development of mobile satcom technologies for more than ten years. The initial work was performed at L-band (1.5 -1.6 GHz), and included system studies and analysis, subsystem and full terminal development, and culminated in numerous field experiments and demonstrations ...

Abstract. Although snow depth on sea ice is a key parameter for thickness (SIT) retrieval, there currently does not exist reliable estimations. In the Arctic, nearly all SIT products use climatology (the modified Warren-99 climatology, W99m) constructed from in situ data obtained prior to first significant impacts of climate change. Antarctic, lack information remains major obstacle development...

In this study, the spherical particle model and ten nonspherical models describing scattering properties of snow are evaluated for potential use in precipitation estimation from spaceborne dual-frequency radar. The single particles computed using discrete dipole approximation (DDA), while those determined Mie theory. profiles WRF output then input to a forward radiative transfer simulate radar ...

The study of mechanism design is sometimes criticized, because the designed mechanisms depend on the fine detail of the model specification, and agents’ behavior relies on the strong common knowledge assumptions on their rationality and others. Hence, the study of ‘detail-free’ mechanism design with weak informational assumptions is the most important to make as the first step towards a practic...