Method and system for aligning an earth station antenna with a satellite antenna
A method for aligning an earth station antenna with a satellite antenna includes sending an uplink signal from the earth station antenna to the satellite antenna; measuring at least a strength of the uplink signal received by the satellite antenna; sending by telemetry the measured signal strength to a telemetry station; adjusting the orientation of the earth station antenna in order to maximize the measured signal strength.
1. Method for aligning an earth station antenna with a satellite antenna, the method comprising:
(a) sending an uplink signal from the earth station antenna to the satellite antenna;
(b) measuring at least a strength of the uplink signal received by the satellite antenna;
(c) sending by telemetry the measured strength to a telemetry station, and
(d) adjusting an orientation of the earth station antenna in order to maximize the measured strength.
2. The method according to claim 1 , wherein the earth station antenna comprises an axis, step (d) of adjusting the orientation of the earth station antenna comprising adjusting the orientation of the axis of the earth station antenna in order to maximize the measured signal strength.
3. The method according to claim 1 , further comprising the following steps for linear polarization:
measuring a first strength of the uplink signal received by the satellite antenna according to a first polarization plane;
measuring a second strength of the uplink signal received by the satellite antenna according to a second orthogonal polarization plane.
4. The method according to claim 3 , further comprising sending by telemetry the first and the second measured signal strengths.
5. The method according to claim 4 , further comprising adjusting an orientation of the earth station antenna about its axis in order to maximize the ratio between the first and the second measured signal strengths.
6. The method according to claim 1 , further comprising calculating the amplitude of the uplink signal by using the first and the second measured signal strengths.
7. The method according to claim 1 , further comprising prepositioning the earth station antenna with respect to the satellite antenna.
8. System for aligning an earth station antenna with a satellite antenna, the system comprising:
an earth station antenna configured to send an uplink signal,
a sensing unit configured to measure at least the strength of the uplink signal sent by the earth station antenna and received by the satellite antenna;
a telemetry emitter configured to send by telemetry the measured signal strength to a telemetry station;
a telemetry station configured to receive the measured signal strength, and
a control loop configured to adjust a position of the earth station antenna in order to maximize the measured signal strength.
9. The system according to claim 8 , wherein the control loop comprises an actuator configured to adjust a position of the axis of the earth station antenna in order to maximize the measured signal strength.
10. The system according to claim 8 , wherein the sensing unit is further configured to measure:
a first strength of the uplink signal received by satellite antenna according to a first polarization plane;
a second strength of the uplink signal received by satellite antenna according to a second, orthogonal polarization plane.
11. The system according to claim 8 , further comprising a processor configured to deduce the ratio between the first and second measured signal strengths.
12. The system according to claim 8 , wherein the actuator is further configured to adjust the orientation of the earth station antenna about its axis in order to maximize the ratio of the first and second measured signal strengths.
13. The system according to claim 8 , wherein the sensing unit and the telemetry emitter are mounted onboard the satellite.