# US 8,783,621 B2 · Method and system for controlling a set of at least two satellites, designed to provide a service on a geostationary orbit, rendering said service on a non-geostationary orbit

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- Number: US 8,783,621 B2
- Document ID: US8783621B2
- Status: Granted
- Kind: B2
- Application number: 13/707,464
- Filed: 2012-12-06
- Published: 2013-06-13
- Granted: 2014-07-22
- Earliest claimed: 2011-12-09
- Assignees: Thales
- Applicants: Thales
- Inventors: Hervé Sainct; Joël Amalric
- Web page: https://patentgrep.com/patent/US8783621B2

## CPC

- B64G 1/1085: {Swarms and constellations}
- B64G 1/2425: {Geosynchronous orbits}
- B64G 1/2427: {Transfer orbits}
- B64G 1/244: {Spacecraft control systems}
- B64G 1/1021: {Earth observation satellites}
- B64G 1/503: {Radiator panels}
- B64G: COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR

## Abstract

A method is provided for controlling a set of at least two satellites, designed to provide a service on a geostationary orbit, rendering said service on a non-geostationary orbit, in which means involved in the performance of said service, installed on board a satellite, are deactivated when the sun can damage it, and means involved in the performance of said service installed on board another satellite of the set are activated, when this is necessary to the continuity of the service.

## Claims

### Claim 1

A method for controlling a set of at least two satellites designed to provide a service on a geostationary orbit and to render said service on a non-geostationary orbit, the method comprising:
deactivating components configured to be involved in performance of said service, the components being installed on board a satellite of the set, when the sun is in a position relative to the satellite to damage said satellite; and
activating other components configured to be involved in the performance of said service, the other components installed on board another satellite of the set, to continue performance of the service.

### Claim 2 (depends on 1)

The method according to claim 1, wherein an attitude of the satellite is controlled based on an instantaneous position of the sun, the method further comprising temporarily modifying the attitude of the satellite when the sun is in the position relative to the satellite to damage the satellite.

### Claim 3 (depends on 2)

The method according to claim 2, wherein temporarily modifying the attitude of the satellite comprises continuous yaw angle piloting of the satellite, such that:
the attitude of the satellite is modified continuously when the sun is in the position relative to the satellite to damage said satellite, and
the satellite reverts to pointing to a target geographic area over which said service is rendered when the sun is not in a position relative to the satellite to damage said satellite.

### Claim 4 (depends on 1)

The method according to claim 1, wherein said service rendered by the set of at least two satellites is imaging of the geographic area of the Earth, and the components configured to be involved in the performance of said service installed on board the other satellite of the set are activated with a temporal offset between said at least two satellites , relative to an imaging duration of a satellite.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the set comprises two satellites, and wherein one of the two satellites starts imaging of a geographic area following completion of half of the imaging of said geographic area by another of the two satellites.

### Claim 6 (depends on 1)

The method according to claim 1, wherein, when the sun is not in a position relative to the satellite to damage said satellite, said satellite is controlled such that, at each instant, the service performed for a geographic area is performed by only one of said at least two satellites.

### Claim 7

A satellite system comprising a set of at least two satellites designed to provide a service on a geostationary orbit and to render said service on a non-geostationary orbit, the satellite system being configured to:
deactivate components configured to be involved in performance of said service, the components being installed on board a satellite of the set, when the sun is in a position relative to the satellite to damage said satellite; and
activate other components configured to be involved in the performance of said service, the other components installed on board another satellite of the set, to continue performance of the service.