Systems and methods for satellite communications with mobile terrestrial terminals
A system of satellite communications provides high throughput data transmission rates for mobile terrestrial terminals. The system may allow point to point communication between two terrestrial terminals. Further, the system may allow point to multipoint communication from an initiating terrestrial terminal to a plurality of target terrestrial terminals. Still further, the system may allow multipoint to multipoint communication from a plurality of initiating terrestrial terminals to a plurality of target terrestrial terminals. The satellites in the system may utilizes on-board functionality such as routing, network management and other data handling functionality. Further, the satellites in the system may communicate amongst each other and route signals through in-box and inter-box communication.
1. A method for controlling an antenna of a satellite in a satellite communications network, wherein the satellite comprises an on-board software processor and the antenna is steerable and has a coverage footprint, the method comprising the steps of:
(a) packing an uplink signal with data in connection with a target terrestrial terminal in the satellite communications network and sending the uplink signal to the satellite, wherein the data is selected from the group consisting of identification data, geoposition data and combinations thereof;
(b) receiving, demodulating and unpacking the uplink signal to determine the current geoposition of the target terrestrial terminal;
(c) comparing geoposition data corresponding to the center of the current coverage footprint of the antenna to be controlled with the current geoposition of the target terrestrial terminal;
(d) creating an error value based on the comparison; and
(e) correcting the error by steering the antenna to be controlled to ensure coverage of the target terrestrial terminal,
wherein steps (b)-(e) are performed in real time by the on-board software processor.
2. The method according to claim 1 , wherein the target terrestrial terminal is non-spaced based and is selected from the group consisting of terminals on terra firma, terminals in sea-borne platforms and terminals in air-borne platforms.
3. The method according to claim 1 , wherein the uplink signal is packed with identification data and geoposition data of the target terrestrial terminal.
4. The method according to claim 1 , wherein the method runs continuously until an interrupt command is received.
5. The method according to claim 1 , wherein the method runs at predetermined intervals until an interrupt command is received.
6. The method according to claim 1 , wherein the coverage area of the antenna to be controlled is subject to consecutive changes.
7. The method according to claim 1 , wherein the uplink signal is sent by the target terrestrial terminal.
8. The method according to claim 1 , wherein the uplink signal is sent by a terrestrial terminal that is not the target terrestrial terminal.
9. The method according to claim 1 , wherein the method runs consecutive changes of the coverage area while conducting signal level measurements to calculate the geoposition of a terrestrial terminal that is not the target terrestrial terminal.
10. The method according to claim 1 , wherein the uplink signal is also packed with an authorization code, and further comprising the steps of authenticating the authorization code and authorizing communication by the on-board software processor.