Concept for a cost/technology-driven mobile satellite communications (MOBILSATCOM) system

1990 ◽  
Author(s):  
John M. Ruddy ◽  
Robert T. Carlson ◽  
Thomas J. Ferguson ◽  
Ronald A. Haberkorn ◽  
Neal D. Hulkower ◽  
...  
Keyword(s):  
Satellite Communications ◽  
Mobile Satellite

Multi-band planar diplexers with sub-sets of frequency-contiguous transmission bands

2021 ◽  
pp. 1-11
Author(s):  
Roberto Gómez-García ◽  
Li Yang ◽  
José-María Muñoz-Ferreras ◽  
Dimitra Psychogiou
Keyword(s):  
High Frequency ◽  
Transmission Band ◽  
Satellite Communications ◽  
Proof Of Concept ◽  
Transmission Zeros ◽  
Cascade Connection ◽  
Coupling Techniques ◽  
In Series ◽  
Mobile Satellite ◽  
Multi Band

Abstract A class of multi-band planar diplexer with sub-sets of frequency-contiguous transmission bands is reported. Such a radio frequency (RF) device is suitable for lightweight high-frequency receivers aimed at multi-band/multi-purpose mobile satellite communications systems. It consists of two channelizing filters, each of them being made up of the in-series cascade connection of replicas of a constituent multi-passband/multi-embedded-stopband filtering stage. This building filtering stage defines a multi-passband transfer function for each channel, in which each main transmission band is split into various sub-passbands by the multi-stopband part. In this manner, each split passband gives rise to several sub-passbands that are imbricated with their counterpart ones of the other channel. The theoretical RF operational principles of the proposed multi-band diplexer approach with sub-sets of imbricated passbands are detailed by means of a coupling–routing–diagram formalism. Besides, the generation of additional transmission zeros in each channelizing filter for higher-selectivity realizations by exploiting cross-coupling techniques into it is also detailed. Furthermore, for experimental demonstration purposes, a microstrip proof-of-concept prototype of second-order octo-band diplexer in the frequency range of 1.5–2.5 GHz that consists of two quad-band channelizing filters with pairs of imbricated passbands is developed and characterized.

Access Control Algorithm with Limited Power Constraint for Mobile Satellite Communications

2014 ◽  
Vol 548-549 ◽  
pp. 1286-1289
Author(s):  
Ya Zhe Gao ◽  
Xiao Han Xia ◽  
Zi Ming Su ◽  
Xi Luan ◽  
Jian Jun Wu
Keyword(s):  
Admission Control ◽  
Control Algorithm ◽  
Load Capacity ◽  
Satellite Communications ◽  
Satellite System ◽  
Power Constraint ◽  
Priority Service ◽  
Limited Power ◽  
Mobile Satellite ◽  
Service Priority

The problem of admission control caused by the limitation of resource in hotspot beams in satellite system is considered in this paper. Based on the idea of borrowing resources from surrounding beams, we give a scheme that the beam reserve resources is borrowed proportionally. After that, the original admission control algorithm based on service priority is modified in order to protect access rate of the low priority service. Simulation results prove that the proved scheme can increases the available beam load capacity effectively and provide a guarantee for the access of those services with low priority.

Integrated Communications and Navigation Terminal

1991 ◽  
Vol 44 (1) ◽  
pp. 67-75
Author(s):  
M. A. Beach ◽  
P. G. Mattos ◽  
M. Chau
Keyword(s):  
Global Positioning System ◽  
Satellite Communications ◽  
Automatic Monitoring ◽  
Global Scale ◽  
Radio Communications ◽  
Communications Industry ◽  
Global Positioning ◽  
Mobile Satellite ◽  
Integrated Communications ◽  
Terminal Equipment

The mobile radio communications industry has recently witnessed a new demand for terminal equipment which can provide both communications and position reporting capabilities on a global scale–for example, the automatic monitoring of secure cargoes during international transportation. Thus, there is much interest in the development of land mobile satellite terminal equipment in the form of a single integrated unit which can economically provide both of these facilities. In this paper the development of such a unit is considered using the Inmarsat-c satellite communications service and the Navstar Global Positioning System (GPS), with extension to GLONASS possible in a receive-only version.

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