The possibility to generate 2-D predictions of solar radiation one hour ahead and over a large geographic area is the focus of this study. In that view, hourly satellite maps of irradiations extracted from the Heliosat-3 have been used as training data and inputs of artificial neural networks (ANN) and as inputs for apersistence model. These models were computed for each point of the map, allow...

Most demand assignment TDMA(1) satellite access protocols use centralised-control access schemes rather than distributed ones because their simplicity and robustness usually compensate for the longer allocation delay. Starting from the FODA/IBEA(2) centralisedcontrol protocol, we studied two distributed-control protocols, named DRIFS(3) and FEEDERS(4) respectively, for accessing a geostationary...

The poor satellite visibility and the weak signal power of the Global Positioning System (GPS) signal reception in side lobes are the main constraint on the Geostationary Earth Orbit (GEO) determination, however, the situation will improve when multi-constellation Global Navigation Satellite Systems (GNSS) become available in the near future. In this study, a navigation algorithm is developed i...

This paper will describe the Energetics Satellite Locating Service (ESLS) which is a unique, patented, proprietary satellite based geolocation system. This system called SAT/TRAC for Satellite Tracking, Ranging and Communications may be used to quickly determine the present location within 50 feet of any person, vehicle or object that is equipped with a ESLS low power transmitter. This technolo...

The paper proposes a new passive bistatic ISAR mode for coastal surveillance based on the exploitation of the signals transmitted by telecommunication geostationary satellites. Specifically it is demonstrated that ISAR images with acceptable quality of ship targets could be obtained by using telecommunication geostationary satellites as opportunity transmitters and stationary passive devices, l...

1 SCHMID, H.: 'Electronic analog/digital conversions' (Van Nostrand Reinhold, 1970), p. 296 2 EDSON, j . o., and HEMMING, H. H.: 'Broadband codecs for an experimental 224M6/5 PCM Terminal', Bell Syst. Tech. J., 1965, pp. 1887-1940 3 RAKOVICH, D., and DJORDJEVICH, B. Z.: 'A wide-range voltage-to-time converter', IEEE Trans., 1973, IM-22, pp. 162-165 4 HART, B. L., and BARKER, R. W. J.: 'A precis...

We discuss applications of high resolution geostationary satellite imagery and distributed high performance computing facilities for the storage, processing and delivery of satellite data products. We describe our system which is built on a distributed high performance computing environment using a number of software infrastructural building blocks and computational resources interconnected by ...

The ACTS system has provided the opportunity to closely study the operation of various data communications protocols at speeds of up to 1.536 Mbps (Megabits per second). We performed performance measurements using the TCP/IP protocol suite, particularly the application layer implementations of FTP. In a separate experiment we studied the SNA/SDLC protocol in Normal Response Mode. Our observatio...

One of the proposed solutions for increasing the speed of Internet access is to connect the home user to a direct satellite channel, at a speed 20 times faster than that of an average telephone modem. Communication over satellite links is often characterized by sporadic high bit-error rates and burst losses. This is especially true when working in the Ka band, where weather conditions greatly a...