Satellite-based tracking of migratory waterfowl is an important tool for understanding the potential role of wild birds in the long-distance transmission of highly pathogenic avian influenza. However, employing this technique on a continental scale is prohibitively expensive. This study explores the utility of stable isotope ratios in feathers in examining both the distances traveled by migrato...

The performance of many electronic systems is often limited by the performance of the clocks they use. For example, a receiver in the Global Positioning System (GPS) works by attempting to align an internally generated pseudorandom signal to an identical signal sent by a satellite and measuring the phase difference between the two. The receiver then calculates the time required for the satellit...

Satellite networks have signi cant advantages over terrestrial networks. Satellites provide unique advantages such as remote coverage with rapid deployment, distance insensitivity, bandwidthon-demand, immunity to terrestrial disasters, o ering broadband links. Broadband satellite networks will play an important role in the rapidly evolving information infrastructure. However, there are several ...

In this paper we study about optical and millimeter radio wave cross-link for formation flight communication satellite system in a geostationary orbit. In formation flight system, since the distance among the satellites becomes short compared with the conventional inter satellite communication link, the size and the weight of the communication system can be reduced. If the high data rate cross-...