Multi-channel satellite calibration
First Claim
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1. A system comprising:
- a calibration system communicatively coupled with a spacecraft, the calibration system configured to;
provide a transmit calibration signal to a plurality of channels of the spacecraft, the transmit calibration signal including a first plurality of sub-carrier signals corresponding to non-overlapping frequency components, each of the channels associated with a corresponding antenna;
obtain from the spacecraft, concurrently for all of the channels, a receive calibration signal including a second plurality of sub-carrier signals derived from the first 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 antennas.
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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.
20 Citations
20 Claims
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1. A system comprising:
a calibration system communicatively coupled with a spacecraft, the calibration system configured to; provide a transmit calibration signal to a plurality of channels of the spacecraft, the transmit calibration signal including a first plurality of sub-carrier signals corresponding to non-overlapping frequency components, each of the channels associated with a corresponding antenna; obtain from the spacecraft, concurrently for all of the channels, a receive calibration signal including a second plurality of sub-carrier signals derived from the first 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 antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
- 9. A calibration sub-system configured to calibrate transmission properties of one or more antennas of a spacecraft by providing an orthogonal frequency-division multiplexed (OFDM) transmit calibration signal having sub-carriers corresponding to non-overlapping frequency components to the spacecraft, and receiving an OFDM receive calibration signal from the spacecraft and having sub-carriers corresponding to non-overlapping frequency components, and providing an adjustment signal representing adjustments to the transmission properties of the 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 the sub-carriers of the transmit calibration signal with the sub-carriers of the receive calibration signal.
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17. A method comprising:
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providing, by a calibration system, a transmit calibration signal having sub-carriers with non-overlapping frequency components; receiving, by the calibration system, a receive calibration signal having sub-carriers with non-overlapping frequency components from a spacecraft; generating, by the calibration system, adjustment data representing differences between sub-carriers of the transmit calibration signal and the sub-carriers of the receive calibration signal; 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