Inter-satellite crosslink communications system, apparatus, method and computer program product

• US 7,460,830 B2
• Filed: 12/29/2004
• Issued: 12/02/2008
• Est. Priority Date: 12/29/2003
• Status: Expired due to Fees

• Current Assignee: Peersat LLC
• Original Assignee: Peersat LLC
• Inventors: Moore, Roscoe M. III
• Primary Examiner(s): Lee; John J.
• Application Number:
  US11/023,400
• Publication Number:
  US 20050143005A1
• Time in Patent Office: 1,434 Days
• Field of Search: 455/427, 455/428, 455/454, 455/456.1, 455/13.1, 455/13.2, 455/429, 455/430, 455/12.1, 455/13.3, 455/431, 455/422.1, 455/3.02, 455/457, 370/316, 370/390
• US Class Current: 455/13.2
• CPC Class Codes: H04B 7/18513 Transmission in a satellite or space-based system
• CPC Class Codes: H04B 7/18521 Systems of inter linked satellites, i.e. inter satellite service for optical links between satellites H04B10/118
• CPC Class Codes: H04B 7/18563 Arrangements for interconnecting multiple systems data switching networks H04L12/00

Abstract

A communications system, apparatus, method, and computer program product for inter-satellite and inter-spacecraft crosslinks (ISL) with non-ISL optimized antennas on spacecraft. The system includes a mobile communications platform that includes an ISL antenna configured to transmit information to a target satellite through a non-ISL antenna of the target satellite. The mobile communications platform is configured to relay transmissions through the non-ISL antenna of the target satellite to another communications platform. The mobile communications platform includes a controller configured to determine a location of the mobile platform; determine whether the target satellite is within communications range; and prepare a signal for relayed transmissions through a non-ISL antenna of the target satellite to another communications platform in a signal format that is decipherable by this other communications platform.

Claims

1. A communications system having at least one component in space, comprising:

a mobile communications platform configured for use in space and to transmit information through an inter-spacecraft link (ISL) antenna to a target satellite through a non-ISL antenna of the target satellite, wherein

the target satellite is configured to transmit signals in a predetermined format to another communication platform,

said mobile communications platform includes a controller configured to

determine a location of the mobile communications platform,

determine whether the target satellite is within communications range, and

prepare a signal for transmission through the non-ISL antenna of the target satellite and for compatible reception at the another communications platform,

said mobile communications platform is configured to relay transmissions through the non-ISL antenna of the target satellite to the another communications platform,

the controller of the mobile communications platform is configured to adapt the mobile communications platform to be able to communicate with the target satellite, and

the mobile communications platform is configured to communicate with more than one target satellite;

the mobile communications platform includes a table look-up device configured to identify a signaling format for a signal used to communicate with each target satellite, wherein

the ISL antenna is configured to increase its beam width and lower its antenna gain in the direction of any one target satellite, and

the controller is further configured to

determine in which zone the mobile communications platform is located for the each target satellite, and

adapt the mobile communications platform to communicate with the each target satellite by changing at least one of frequency, power, modulation, and protocol.

2. A communications system having at least one component in space, comprising:

a mobile communications platform configured for use in space and to transmit information through an inter-spacecraft link (ISL) antenna to a target satellite through a non-ISL antenna of the target satellite, wherein

the target satellite is configured to transmit signals in a predetermined format to another communication platform,

said mobile communications platform includes a controller configured to

determine a location of the mobile communications platform,

determine whether the target satellite is within communications range, and

prepare a signal for transmission through the non-ISL antenna of the target satellite and for compatible reception at the another communications platform,

said mobile communications platform is configured to relay transmissions through the non-ISL antenna of the target satellite to the another communications platform,

the mobile communications platform is configured to adapt a data transfer rate thereof based on a capacity of a link formed with the target satellite,

the mobile communications platform is further configured to determine if the mobile communications platform is located within at least one of a main-lobe and a side-lobe of the target satellite, and

the non-ISL antenna of the target satellite is not configured to track a trajectory of the mobile communications platform.

3. A communications system having at least one component in space, comprising:

a mobile communications platform configured for use in space and to transmit information through an inter-spacecraft link (ISL) antenna to a target satellite through a non-ISL antenna of the target satellite, wherein

the target satellite is configured to transmit signals in a predetermined format to another communication platform,

said mobile communications platform includes a controller configured to

determine a location of the mobile communications platform,

determine whether the target satellite is within communications range, and

prepare a signal for transmission through the non-ISL antenna of the target satellite and for compatible reception at the another communications platform, and

said mobile communications platform is configured to relay transmissions through the non-ISL antenna of the target satellite to the another communications platform,

wherein the mobile communications platform further comprises;

a determination device configured to determine what radio communication parameters, including signaling format, are associated with the target satellite before the mobile communications platform enters a communication area of the target satellite, said determination device including

an identification device configured to identify the target satellite as being a next communications resource to communicate therewith;

a location device configured to locate the target satellite in a look-up table before attempting to establish a communications link with the target satellite;

an accessing device configured to access information in the look-up table for a particular zone into which the mobile communications platform moves for communicating with the target satellite; and

a transmitting device configured to transmit a signal in a proper signaling format through the target satellite while located in the particular zone of the target satellite before the mobile communications platform is no longer within the communication area of the target satellite.

4. A method of using an agile radio hosted on a mobile communications platform configured for use in space to relay transmissions through a non-ISL antenna of a target satellite, comprising steps of:

monitoring frequencies in use for radio communications with the non-ISL antenna of a target satellite while the mobile communications platform enters a communication area of the target satellite;

comparing frequencies identified in said monitoring step with a table of available frequencies stored in memory;

forming a signal to communicate with the target satellite formatted to be compatible with a signaling format used by the target satellite; and

transmitting the signal in an unused frequency spectrum of the target satellite so as to transmit information through the target satellite for a predetermined telecommunications purpose before the mobile communications platform is no longer within the communication area of the target satellite.

5. An agile radio hosted on a mobile communications platform configured for use in space to relay transmissions through a non-ISL antenna of a target satellite, comprising:

a monitoring device configured to monitor frequencies to generate monitored frequencies in use for radio communications with the target satellite while the mobile communications platform enters a communication area of a target satellite;

a comparing device configured to compare the monitored frequencies in use with a table of available frequencies stored in memory;

a table look-up device configure to identify a signaling format for a signal used to communicate with the target satellite; and

a transmitter configured to use an unused frequency spectrum within the available frequencies of the target satellite to transmit the signal through the target satellite for a predetermined telecommunications purpose before the mobile communications platform is no longer within the communication area of the target satellite.

6. A method of a mobile communications platform configured to use a look-up table in space to adapt to communicate with non-ISL antenna of a target satellite, comprising steps of:

determining what radio communication parameters, including signaling format, are associated with the target satellite before the mobile communications platform enters a communication area of the target satellite, said determining step including

identifying the target satellite as being a next communication resource to communicate with, and

locating the target satellite in the look-up table before attempting to establish a communications link with the target satellite;

accessing information in the look-up table for a particular zone into which the mobile communications platform moves for communicating with the target satellite; and

transmitting a signal in the signaling format through the target satellite while located in the particular zone before the mobile communications platform is no longer within the communication area of the target satellite.

7. The method of claim 6, wherein the zone includes a side-lobe, a main-lobe, or a narrow beam.

8. A mobile communications platform in space configured to use a look-up table to adapt to communicate with a non-ISL antenna of a target satellite, comprising:

a determination device configured to determine what radio communication parameters, including signaling format, are associated with the target satellite before the mobile communications platform enters a communication area of the target satellite, said determination device including

an identification device configured to identify the target satellite as being a next communications resource to communicate therewith;

a location device configured to locate the target satellite in the look-up table before attempting to establish a communications link with the target satellite;

an accessing device configured to access information in the look-up table for a particular zone into which the mobile communications platform moves for communicating with the target satellite; and

a transmitting device configured to transmit a signal in the signaling format through the target satellite while located in the particular zone of the target satellite before the mobile communications platform is no longer within the communication area of the target satellite.

9. The mobile communications platform of claim 8, wherein the zone includes a side-lobe, a main-lobe, or a narrow beam.

10. A method for using a link channeler on a mobile communications platform, comprising steps of:

determining an information display standard of an end-user communication terminal while the mobile communications platform enters a communication area of a non-ISL antenna of a target satellite;

using the information display standard to format data and generate formatted data to be transmitted from an ISL antenna of the mobile communications platform to the non-ISL antenna of the target satellite;

transmitting the formatted data over a link formed between the ISL antenna on the mobile communications platform and the non-ISL antenna on the target satellite before the mobile communications platform exits the communication area of the target satellite; and

said target satellite relaying the data to the end-user communication terminal in an appropriate format to transmit information over a communications link.

11. A link channeler used in a mobile communications platform, comprising:

a determination device configured to determine an information display standard of an end-user communication terminal while the mobile communications platform enters a communication area of a target satellite;

a format device configured to use the information display standards to format data to generate formatted data to be transmitted from an ISL antenna of the mobile communications platform to a non-ISL antenna of the target satellite;

a transmitter configured to transmit the formatted data over a link formed between the ISL antenna on the mobile communications platform and the non-ISL antenna on the target satellite before the mobile communications platform exits the communication area of the target satellite; and

said target satellite relaying the data to the end-user communication terminal.

12. A method of using a software defined radio hosted on a mobile communications platform configured for use in space to relay transmissions through a non-ISL antenna of a target satellite, comprising steps of:

looking up signal formatted parameters for use in radio communications with the non-ISL antenna of the target satellite while the mobile communications platform enters a communication area of the target satellite;

comparing the signal formatted parameters with a table of all available modulation waveforms stored in memory;

adapting the signal formatted parameters with the software defined radio on board the mobile communications platform to communicate with the non-ISL antenna of the target satellite; and

communicating using a signal having the signal formatted parameters with the non-ISL antenna of the target satellite to transmit information through the target satellite for a specific telecommunications purpose to close an end-to-end communication link before the mobile communications platform is no longer within the communication area of the target satellite.

13. A communications system having at least one component in space, comprising:

a mobile communications platform configured for use in space and to transmit information through an inter-spacecraft (ISL) antenna to a target satellite through a non-ISL antenna of the target satellite using a same transmission format and communication standard that a non-ISL antenna would receive from a conventional antenna within the Earth'"'"'s atmosphere designed to communicate with the non-ISL antenna, wherein

said mobile communications platform includes a controller configured to

determine a location of the mobile communications platform,

determine whether the target satellite is within communications range, and

prepare a signal for transmission through the non-ISL antenna of the target satellite and for compatible reception at another communication platform communicatively linked to the conventional antenna that uses the same transmission format and communications standard that the non-ISL antenna normally receives from the conventional ground antenna designed to operate with that non-ISL antenna, and

the mobile communications platform is configured to relay the signal through the non-ISL antenna of the target satellite to the another communications platform.

14. A communications system having at least one component in space, comprising:

a mobile communications platform configured for use in space and to transmit information through an inter-spacecraft link (ISL) antenna to a target satellite through a non-ISL antenna of the target satellite, wherein

the target satellite is configured to transmit signals in a predetermined format to another communication platform,

said mobile communications platform includes a controller configured to

determine a location of the mobile communications platform,

determine whether the target satellite is within communications range, and

prepare a signal for transmission through the non-ISL antenna of the target satellite and for compatible reception at the another communications platform,

said mobile communications platform is configured to relay transmissions through the non-ISL antenna of the target satellite to the another communications platform,

the controller of the mobile communications platform is configured to adapt the mobile communications platform to be able to communicate with the target satellite, and

the mobile communications platform is configured to communicate with more than one target satellite;

the mobile communications platform includes a table look-up device configured to identify a signaling format for a signal used to communicate with each target satellite; and

the ISL antenna is configured to increase its beam width and lower its antenna gain in the direction of any one target satellite.

15. A communications system having at least one component in space, comprising:

a mobile communications platform configured for use in space and to transmit information through an inter-spacecraft link (ISL) antenna to a target satellite through a non-ISL antenna of the target satellite, wherein

the target satellite is configured to transmit signals in a predetermined format to another communication platform,

said mobile communications platform includes a controller configured to

determine a location of the mobile communications platform,

determine whether the target satellite is within communications range, and

prepare a signal for transmission through the non-ISL antenna of the target satellite and for compatible reception at the another communications platform,

said mobile communications platform is configured to relay transmissions through the non-ISL antenna of the target satellite to the another communications platform,

the controller of the mobile communications platform is configured to adapt the mobile communications platform to be able to communicate with the target satellite, and

the mobile communications platform is configured to communicate with more than one target satellite, and

the controller is further configured to

determine in which zone the mobile communications platform is located for the each target satellite, and

adapt the mobile communications platform to communicate with the each target satellite by changing at least one of frequency, power, modulation, and protocol.

16. A communications system having at least one component in space, comprising:

a mobile communications platform configured for use in space and to transmit information through an inter-spacecraft link (ISL) antenna to a target satellite through a non-ISL antenna of the target satellite, wherein

the target satellite is configured to transmit signals in a predetermined format to another communication platform,

said mobile communications platform includes a controller configured to

determine a location of the mobile communications platform,

determine whether the target satellite is within communications range, and

prepare a signal for transmission through the non-ISL antenna of the target satellite and for compatible reception at the another communications platform,

said mobile communications platform is configured to relay transmissions through the non-ISL antenna of the target satellite to the another communications platform,

the controller of the mobile communications platform is configured to adapt the mobile communications platform to be able to communicate with the target satellite, and

the mobile communications platform is configured to communicate with more than one target satellite;

the mobile communications platform includes a table look-up device configured to identify a signaling format for a signal used to communicate with at least two target satellites at a same time; and

the ISL antenna is configured to increase its beam width and lower its antenna gain in a direction of at least two or more satellites to transmit information to the another communications platform.