Communications: directive radio wave systems and devices (e.g. – Directive – Including a satellite
Patent
1997-07-14
1999-11-30
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Including a satellite
455 121, H04B 7185
Patent
active
059950404
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to a global system dedicated to radionavigation and radiopositioning of mobile units (for example satellites) and fixed points. It also relates to beacons and receivers used in the said system.
2. State of Prior Art
Known state of the art systems include the DORIS system, the GPS system, the GLONASS system and the PRARE system.
The DORIS system is described in references [1] [2] and [3].
The GPS-NAVSTAR system is described in reference [4].
The GLONASS system is described in reference [5].
The PRARE system is described in reference [6].
The purpose of the invention is a universal radionavigation/positioning system that is more precise and is better adapted for a large number of navigation and positioning applications, than the systems mentioned above made using prior art.
The invention is part of the GNSS (Global Navigation Space System) that refers to all global radionavigation systems using a space segment and short spectrum spreading codes.
DESCRIPTION OF THE INVENTION
This invention provides a global system dedicated to radionavigation and radiopositioning of mobiles and fixed points, characterized in that it comprises a land segment, a space segment and a user segment, and that the land segment comprises the following elements: single-directional radioelectric signal with a wide spectrum towards user satellites, each of these beacons transmitting a message containing a beacon identification code; transmits them when the satellites overfly the master beacons; center, separates remote measurements into two groups, one containing remote measurements necessary for processes specific to the processing center, and the other containing remote measurements specific to some clients of services offered by the said system; satellites, the master satellites closely participating in operation of the system, and in that the user segment is composed mainly of mobiles carrying specific receivers, and fixed client beacons.
The ground beacons are advantageously of two types, and particularly: permanently transmit a signal and periodically transmit their positions (and in some cases their velocity); put into service; user satellites and/or a part of the system accepting data.
The system also comprises autonomous local receiver and beacon cells not necessarily radioelectrically connected to the satellites in the said system.
The processing center advantageously produces the following output: time; the system time itself being produced by the processing center; clients of services provided by the system according to the invention and returned to the control center that uses them to generate its work and programming plans, and to provide routine orbits to remote measurement/remote control stations using services provided by the system according to the invention.
Master satellites may be equipped with a special receiver connected to an ultra-stable oscillator, the unprocessed measurements made by this receiver and the data originating from the beacons being formatted in the form of remote measurements received by the ground, with the processing center as the final destination. Master satellites are capable of processing the message transmitted by the master beacons.
Master satellites have quasi-heliosynchronous type orbits, possibly together with low type and/or geostationary orbits.
Client satellites do not necessarily address their remote measurement to the processing center. Client satellites are not necessarily capable of processing the message transmitted by the master beacons.
Client satellites may be in any type of orbit and form part of the space segment and the system user segment simultaneously.
Client beacons are mainly positioning beacons, or time beacons.
Advantageously, beacons are connected to a microcomputer used to program some beacon parameters and verify that they are working correctly.
The microcomputer is connected to local measurement sensors such as: sensors; order to make remote failure diagnostics at the control center;
Beacons may be single-
REFERENCES:
patent: 4445118 (1984-04-01), Taylor et al.
Aguttes Jean Paul
Berges Dominique
Cugny Bruno
Issler Jean Luc
Blum Theodore M.
Centre National d'Etudes Spatiales
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