In the context of the increasing demand in high-speed data link for scientific, planetary exploration and earth observation missions, the Italian Space Agency (ASI), involving Thales Alenia Space as prime, the Polytechnic of Turin and other Italian partners, is developing a program for feasibility demonstration of optical communication system with the goal of a prototype flight mission in the n...

In recent years, a growing interest has been witnessed in the usage of free space optics (FSO) link for satellite communication (SATCOM) scenarios, as it offers much higher data rates up to gigabits per second (Gbps) compared existing radio frequency (RF) link. However, FSO links are sensitive beam scintillation and pointing errors. this paper, we consider hybrid FSO/RF between ground station (...

For one isolated wireless link we take a unified look at simple beamforming (BF) as contrasted with MIMO to see how both emerge and under which conditions advantage goes to one or the other. Communication is from a high base array to a user in clutter. The channel propagation model is derived from fundamentals. The base knows the power angular spectrum, but not the channel instantiation. Eigens...

This paper addresses possible capacity gains in a cdma2000 1xEV-DO system that utilizes the Opportunistic Beam Forming (OBF) scheme. Contrary to the voice-oriented cdma2000 systems, where it is desirable to maintain a fixed signal-to-interference-and-noise ratio (SINR) level at the access terminal (AT), the 1xEV-DO system is designed to take advantage of the natural SINR fluctuations in a wirel...

Free vibration characteristics of continuous grading fiber orientation (CGFO) beams resting on variable Winkler and two-parameter elastic foundations have been studied. The beam is under different boundary conditions and assumed to have arbitrary variations of fiber orientation in the thickness direction. The governing differential equations for beam vibration are being solved using Generalized...

In recent years, establishing more and more explicit, complete and accurate dynamic models for the special category of flexible link manipulators has been a formidable challenging and still open problem in robotics research. This chapter is devoted to a methodological presentation of the application of Timoshenko beam (TB) theory (TBT) concepts to the mathematical description of flexible link r...

Deployment of a satellite borne, steerable antenna array with higher directivity and gain in Low Earth Orbit makes sense to reduce ground station complexity and cost, while still maintaining a reasonable link budget. The implementation comprises a digitally beam steerable phased array antenna integrated with a complete system, comprising the antenna, hosting platform, ground station, and aircra...

The linear control of a nonlinear response is investigated in this paper, and model the system developed validated. design has been constrained based on suggested application, wherein mass expense are parameters to be kept minimum. Through these restrictions, array potential applications for widened. structure envisioned as robot manipulator link, utilises piezoelectric elements both sensors ac...