In disaster management scenarios with seriously damaged, not existing, or saturated communication infrastructures satellite communications can be an ideal means to provide connectivity with unaffected remote terrestrial trunked radio (TETRA) core networks. However, the propagation delay imposed by the satellite link affects the signalling protocols. This paper discusses the suitability of using...

Satellite ISPs connect users to the Internet by means of satellite communication. In this paper we discuss how to misuse satellite ISPs to allow any subscribed user to broadcast arbitrary content to a group of anonymous receivers. Exploiting the fact that the satellite downstream signal, containing the data requested by a user, is not only sent to this specific user only, but can be received in...

Satellite scheduling, like all scheduling, is the problem of mapping tasks (observation, communication, downlink, control maneuvers, etc.) to resources (sensor satellites, relay satellites, ground stations, etc.). Through our work on satellite scheduling problems, we have encountered many different constraints that are particular to the satellite-scheduling domain. In this paper, we will introd...

The International Maritime Satellite (Inmarsat) communication service can be used to provide a wide area network (WAN) connection for a local area network (LAN) to the home LAN from almost anywhere on the earth. The communication link of the WAN connection is achieved through the satellite network of Inmarsat and a land-earth digital telephone network, such as Integrated Services Digital Networ...

SCADA systems have been playing important roles for industrial automation and processing, as the results the productions can be produced in minimal time with more efficiency and profitability. Mainly, the whole industrial production is carried through various connected sensors or field devices, which may configured in local area network (LAN)/Wide area network (WAN). In previous two decades, wi...

In order to address low power, low processing delay requirement of emerging satellite communication systems, there is a need for low complexity small block length forward error correction (FEC) codes. Furthermore the new trends towards the convergence of wireless and satellite terminals would also mean co-existence of support for very short and the long blocks of data in the same device. In thi...

In this paper we highlight the fact that a huge amount of information is sent unsecured via satellite broadcast data channels (here: encapsulated in DVB-s). By applying straightforward data analysis it is possible for any attacker equipped with a digital satellite dish and a DVB card PC to derive extensive confidential information on single users (e.g., legal name, banking details, monthly inco...

The computer simulation activities which have been carried out at The Aerospace Corporation for satellite link performance studies and system analysis are reported. A brief description of the modelings of a filter, nonlinear device, modulator, detector and receiver is also given. Some results from the simulation studies, such as the basic link performance in the presence of filters and nonlinea...

With the consideration of the existing Ka-band satellite channel model in data processing method deficiency, the Ka-band satellite channel propagation characteristic is analyzed and the influence of meteorological factors on the satellite channel is discussed. The channel of meteorological factor principal component is obtained by using the principal component analysis and fuzzy clustering anal...

The problem of single-channel reception global positioning system (GPS) communication waveforms makes passive sensing aerial target difficult because forward scatter. This paper proposes a novel method based on linear canonical transformation (LCT) using the scattered satellite waveforms. proposed firstly preprocesses received signal characteristics traditional tracking loop and to effectively ...