# US 8,783,620 B2 · Method and system for controlling a set of at least two satellites adapted to provide a service

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- Number: US 8,783,620 B2
- Document ID: US8783620B2
- Status: Granted
- Kind: B2
- Application number: 13/656,283
- Filed: 2012-10-19
- Published: 2013-05-02
- Granted: 2014-07-22
- Earliest claimed: 2011-10-28
- Assignees: Thales
- Applicants: Thales
- Inventors: Herve Sainct; Joel Amalric; Pierre Bassaler; Xavier Roser
- Web page: https://patentgrep.com/patent/US8783620B2

## CPC

- B64G 1/242: {Orbits and trajectories}
- B64G 1/1085: {Swarms and constellations}
- B64G 1/2429: {Station keeping}
- B64G 1/1007: {Communications satellites}
- B64G 1/1021: {Earth observation satellites}
- B64G: COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR

## Abstract

A method is provided for controlling a set of at least two satellites adapted to provide a service used by at least one portion of the set of the said satellites at a given moment, in which, continuously or pseudo-continuously, a mean value of the longitudes of the respective ascending nodes of each satellite is computed, and, for each satellite, a correction of trajectory of the satellite is applied by regulating the longitude of the ascending node on a setpoint equal to said current mean value.

## Claims

### Claim 1

A method for controlling a set of at least two satellites configured to provide a service used by at least one portion of the set of said satellites at a given moment, the method comprising:
computing, continuously or pseudo-continuously, a mean value of longitudes of respective ascending nodes of each satellite; and
controlling, for each satellite, a correction of trajectory of the satellite by regulating a longitude of an ascending node on a setpoint equal to said mean value.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the longitude of the ascending node of each satellite is measured, respectively, when the satellite is visible from a ground control station.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the ground control station is connected to other ground control stations via a communication network.

### Claim 4 (depends on 1)

The method according to claim 1, wherein a single ground control station is used for the set of the said satellites.

### Claim 5 (depends on 1)

The method according to claim 1, wherein controlling the correction of the trajectory of the satellite is deferred to a moment when the satellite no longer participates in provision of said service.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the computing and controlling are carried out autonomously by the set of satellites, the controlling being configured to communicate to broadcast values of the ascending node longitudes necessary for the computing of said mean value.

### Claim 7

A system for controlling a set of at least two satellites configured to provide a service used by at least one portion of the set of said satellites at a given moment, the system being configured to:
compute, continuously or pseudo-continuously, a mean value of longitudes of respective ascending nodes of each satellite; and
control, for each satellite, a trajectory correction of the satellite by regulation of a longitude of an ascending node on a setpoint equal to said mean value.