Multi-channel satellite antenna calibration
First Claim
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1. A system comprising:
- a calibration system communicatively coupled with a spacecraft, the calibration system configured to;
transmit an orthogonal frequency division multiplexed (OFDM) calibration signal to a satellite communications network of the spacecraft, the calibration signal including a first plurality of sub-carrier signals;
receive from the spacecraft an OFDM receive calibration signal-including a second plurality of sub-carrier signals;
determine a first set of differences between the first plurality of sub-carrier signals and the second plurality of sub-carrier signals; and
use the determined first set of differences to adjust one or more transmission properties of the spacecraft.
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Abstract
This disclosure provides systems, methods and apparatus for multi-channel satellite calibration. In one aspect, a calibration system can provide a transmit calibration signal based on a reference calibration signal to a satellite. The satellite can transmit back a receive calibration signal that can be obtained by the calibration system. Sub-carriers of the receive calibration signal can be compared with sub-carriers of the reference signal to determine adjustments to transmission properties of antennas of the satellite.
26 Citations
20 Claims
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1. A system comprising:
a calibration system communicatively coupled with a spacecraft, the calibration system configured to; transmit an orthogonal frequency division multiplexed (OFDM) calibration signal to a satellite communications network of the spacecraft, the calibration signal including a first plurality of sub-carrier signals; receive from the spacecraft an OFDM receive calibration signal-including a second plurality of sub-carrier signals; determine a first set of differences between the first plurality of sub-carrier signals and the second plurality of sub-carrier signals; and use the determined first set of differences to adjust one or more transmission properties of the spacecraft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 9. A calibration sub-system configured to calibrate transmission properties of antennas of a spacecraft by transmitting an orthogonal frequency-division multiplexed (OFDM) calibration signal to the spacecraft, and receiving an OFDM receive calibration signal from the spacecraft, and providing an adjustment signal representing adjustments to the transmission properties of one or more antennas, the adjustments corresponding to changes to one or more of a phase, amplitude, group delay, or power level of signals provided by the one or more of the antennas based on a comparison of a first plurality of sub-carriers associated with the transmit calibration signal and a second plurality of sub-carriers associated with the receive calibration signal.
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17. A method comprising:
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transmitting, by a calibration system, an orthogonal frequency division multiplexed (OFDM) calibration signal having a first plurality of sub-carriers; receiving, by the calibration system, an OFDM receive calibration system signal having a second plurality of sub-carriers from a spacecraft; generating, by the calibration system, adjustment data representing differences between the first plurality of sub-carriers and the second plurality of sub-carriers; and providing, by the calibration system, an adjustment signal providing the adjustment data to adjust transmission properties of one or more antennas of the spacecraft. - View Dependent Claims (18, 19, 20)
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Specification