Managing inter-satellite connections in a constellation with overlapping orbital planes

• US 6,249,513 B1
• Filed: 02/06/1998
• Issued: 06/19/2001
• Est. Priority Date: 02/06/1998
• Status: Expired due to Fees

• Current Assignee: Com Dev Limited (Honeywell International Inc.)
• Original Assignee: Com Dev Limited (Honeywell International Inc.)
• Inventors: Malarky, Alastair
• Primary Examiner(s): Vu, Huy D.
• Assistant Examiner(s): Boakye, Alexander
• Application Number:
  US09/019,904
• Time in Patent Office: 1,229 Days
• Field of Search: 370/316, 370/317, 370/318, 455/13.1, 701/226, 701/224, 342/357, 342/356, 342/357.06
• US Class Current: 370/316
• CPC Class Codes: H04B 7/18521 Systems of inter linked satellites, i.e. inter satellite service for optical links between satellites H04B10/118

Abstract

A system and method for managing inter-satellite connectivity in the overlapped regions of a satellite constellation having a plurality of overlapping orbital planes. The overlapped regions are created by the intersection of orbital planes having satellites traveling in one direction with orbital planes having satellites traveling in a similar or in the opposite direction. One orbital plane is designated as the master plane and within the overlapped region, the satellites in the master plane are dynamically switched to non-overlapped satellites in the intersecting planes across a seam created by the intersection of the master plane with the intersecting planes.

Claims

1. A method of managing inter-satellite connections in a constellation of satellites having overlapping orbital planes, each orbital plane including a plurality of satellites, and each satellite having a plurality of inter-satellite links for connecting to other satellites, the method comprising the steps of:

(a) designating at least one orbital plane as the master plane; and

(b) at regions where the orbital planes overlap, dynamically switching the satellites in the master plane to satellites in intersecting orbital planes across a boundary created by the intersection of the master plane with the intersecting orbital planes by

(b) (1) for each satellite in the master plane, making a first connection to a non-overlapped satellite in a first intersecting plane;

(b) (2) after a certain period of time, breaking the first connection to the non-overlapped satellite in the first intersecting plane; and

(b) (3) making a second connection to a non-overlapped satellite in a second intersecting plane.

2. The method of claim 1, wherein the constellation includes a plurality of intersecting planes to the master plane, and wherein the steps of breaking a connection to a satellite in one intersecting plane and subsequently making a connection to a satellite in another intersecting plane are repeated until the satellites in the master plane reach a particular orbital latitude.

3. The method of claim 1, wherein the designating and dynamically switching steps are pre-programmed into a network that commands and controls the inter-satellite connections by transmitting directions to make and break connections in the satellite constellation.

4. The method of claim 1, wherein the designating and dynamically switching steps are managed by one or more computers on-board each satellite.

5. The method of claim 1, wherein the inter-satellite links are optical terminals.

6. The method of claim 1, wherein the inter-satellite links are radio-frequency terminals.

7. A method of managing inter-satellite connections in a constellation of satellites having overlapping orbital planes, each orbital plane including a plurality of satellites, and each satellite having a plurality of inter-satellite links for connecting to other satellites, the method comprising the steps of:

(a) designating at least one orbital plane as the master plane; and

(b) at regions where the orbital planes overlap, dynamically switching the satellites in the master plane to satellites in intersecting orbital planes across a boundary created by the intersection of the master plane with the intersecting orbital planes, wherein satellites in the intersecting planes that are overlapped by satellites in the master plane are only connected to satellites traveling in the same direction.

8. A method of managing inter-satellite connections in a constellation of satellites having overlapping orbital planes, each orbital plane including a plurality of satellites, and each satellite having a plurality of inter-satellite links for connecting to other satellites, the method comprising the steps of:

(a) designating at least one orbital plane as the master plane; and

(b) at regions where the orbital planes overlap, dynamically switching the satellites in the master plane to satellites in intersecting orbital planes across a boundary created by the intersection of the master plane with the intersecting orbital planes, wherein the dynamically switching step includes the steps of;

connecting the satellites in the master plane across the boundary to non-overlapped satellites in the intersecting planes, and dynamically switching the satellites in the master plane to other non-overlapped satellites in the intersecting planes.

9. The method of claim 8, wherein each satellite in the master plane is first connected to a non-overlapped satellite in a first intersecting plane, and as the connected satellites move out of range, the satellite in the master plane is then connected to a non-overlapped satellite in a second intersecting plane.

10. The method of claim 9, wherein each satellite in the master plane is subsequently connected to non-overlapped satellites in additional intersecting planes until the satellites in the master plane reach an orbital latitude where the connections across the boundary are no longer established.

11. The method of claim 10, wherein the satellites of the master plane subsequently reach an orbital latitude where the connections across the boundary are reestablished.

12. A satellite constellation comprising:

a plurality of satellites, each satellite having a plurality of inter-satellite links for making connections to other satellites wherein the plurality of satellites are organized into a plurality of overlapping orbital planes;

wherein at least one orbital plane is designated as the master plane, and the inter-satellite links of the satellites in the master plane are dynamically switched to satellites in intersecting orbital planes in regions where the orbital planes overlap; and

on-board computer systems on each satellite that manage the dynamic switching of satellites between planes using orbital data derived from command and control computers at Earth ground stations that track the satellite orbits.

13. The satellite constellation of claim 12, wherein the inter-satellite links are optical terminals.

14. A system for managing inter-satellite connections in a constellation of satellites having overlapping orbital planes, each orbital plane including a plurality of satellites, and each satellite having a plurality of inter-satellite links for connecting to other satellites, the system comprising:

(a) means for designating at least one orbital plane as the master plane; and

(b) means for dynamically switching the satellites in the master plane to non-overlapped satellites in intersecting planes across a seam created by the intersection of the master plane with the intersecting planes.