Systems and methods for tracking mobile terrestrial terminals for satellite communications

• US 8,713,324 B2
• Filed: 01/17/2007
• Issued: 04/29/2014
• Est. Priority Date: 01/18/2006
• Status: Active Grant

• Current Assignee: Ovzon Sweden AB
• Original Assignee: OverHorizon Cyprus Plc
• Inventors: Wahlberg, Per, Lejnell, Kennet
• Primary Examiner(s): Pham, Luu
• Assistant Examiner(s): Kabir, Jahangir
• Application Number:
  US11/623,902
• Publication Number:
  US 20070168675A1
• Time in Patent Office: 2,659 Days
• Field of Search: 713/150, 713/168, 713/169, 380/255, 380/270, 725/63, 725/68, 725/72, 701/200, 701/226, 455/12.1, 455/13.1, 455/427
• US Class Current: 713/182
• CPC Class Codes: H04B 7/18567 Arrangements for providing additional services to the basic mobile satellite telephony service

Abstract

System and methods provide tracking capabilities by one or a plurality of satellites for a mobile terrestrial terminal. A user requests that a satellite track a particular mobile terrestrial terminal. If the user privilege level allows for this level of control, the satellite adjusts to track the identified terminal. One method for tracking involves the use of a steerable antenna in which the antenna steers to maintain a footprint over the identified mobile terminal. Another method for tracking involves moving the satellite itself to maintain a footprint over the identified mobile terminal. The tracking functionality may utilize a closed loop tracking method.

Claims

1. A method for allowing a user to access control of one or more steerable antennas on a communications satellite in a satellite communications network, the method comprising the steps of:

a) receiving, from the user, a request to access control of the one or more steerable antennas, wherein the user enters geoposition data corresponding to the desired area of satellite coverage into an initiating terrestrial terminal;

b) sending from the initiating terrestrial terminal to the communications satellite a request signal comprising the user'"'"'s request and a user identification with a user privilege level, or a terrestrial terminal identification with a terminal privilege level, wherein;

the initiating terrestrial antenna automatically transmits geoposition data to the communications satellite when the initiating terrestrial terminal moves; and

the communications satellite (i) receives, demodulates and unpacks the request signal and routes the request to a software engine on-board the communications satellite, (ii) uses the geoposition data to change the pointing direction of the one or more steerable antennas, and (iii) further transmits geoposition data of the one or more steerable antennas to the initiating terrestrial terminal;

c) receiving, by the communications satellite, the request signal comprising the user identification or the initiating terrestrial terminal identification;

d) determining whether the user or the initiating terrestrial terminal is authorized to send the request;

e) using the software engine on-board the communications satellite, identifying a required privilege level for accessing control of the one or more steerable antennas on the communications satellite;

f) comparing the privilege level associated with the user or with the initiating terrestrial terminal to the required privilege level;

g) determining from the request signal whether the initiating terrestrial terminal or the user has a privilege level corresponding to, or exceeding, the required privilege level; and

h1) if the determined privilege level meets or exceeds the required privilege level, sending a confirmation of service signal to the initiating terrestrial terminal to permit the user to access control of the one or more steerable antennas on the communications satellite, or

h2) if the privilege level determined from the request signal does not meet or exceed the required privilege level, sending a denial of service signal to the initiating terrestrial terminal,

wherein the confirmation or denial of service signal is sent by the software engine on board the communications satellite to the initiating terrestrial terminal, and wherein the user'"'"'s control of the one or more steerable antennas is based on billing information.

2. The method according to claim 1, wherein the communications satellite further comprises a database that stores privilege levels, each privilege level associated with at least one of a plurality of users and a plurality of terrestrial terminals.

3. The method according to claim 1, wherein the request signal specifies a request for accessing manual control of the one or more steerable antennas.

4. The method according to claim 1, wherein the initiating terrestrial terminal automatically transmits position data to the communications satellite if the initiating terrestrial terminal is approved for accessing control of the one or more steerable antennas.

5. The method according to claim 1, wherein the request signal is sent from the initiating terrestrial terminal to the communications satellite on an encrypted channel.

6. The method according to claim 1, further comprising the step of sending a confirmation of service signal to at least one other terrestrial terminal in a same network as the initiating terrestrial terminal.

7. The method according to claim 1, further comprising the steps of detecting a jammer on a particular satellite beam and informing the user of the detected jammer.