Antenna system calibration
First Claim
1. A method for calibrating an antenna system having electronics and a pair of passive antennas for connection to the electronics in which modification control is applied to the electronics based upon a pilot signal injected into the electronics through a pair of signal interfaces when the electronics is being operated, the method comprising:
- receiving a signal with the passive antennas and determining amplitude and phase differences in the received signal between the first and second passive antennas;
injecting a test signal to one of the signal interfaces and then the other and determining the amplitude and phase differences in the test signal between when it is injected to the one of the signal interfaces and the other; and
determining a calibration offset that is equal to the determined amplitude and phase differences in the test signal between when it is injected to the one of the signal interfaces and the other, subtracted from the determined amplitude and phase differences in the received signal between the passive antennas.
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Accused Products
Abstract
A method for calibrating an antenna system having electronics and two or more passive antennas for connection to the electronics and two or more signal interfaces for use with a pilot signal. The method includes compensating for three major errors in order to find calibration offsets in a deterministic process. These errors are caused by differences between antenna interfaces, differences between signal interfaces and frequency margin, i.e., frequency offset, between main signal and accessory (pilot) signal. In the method, a calibration offset is initially determined that accounts for the errors caused by antenna and signal interfaces. Further refinement is performed by accounting for errors caused by the frequency margin between the main and accessory signals.
147 Citations
16 Claims
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1. A method for calibrating an antenna system having electronics and a pair of passive antennas for connection to the electronics in which modification control is applied to the electronics based upon a pilot signal injected into the electronics through a pair of signal interfaces when the electronics is being operated, the method comprising:
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receiving a signal with the passive antennas and determining amplitude and phase differences in the received signal between the first and second passive antennas; injecting a test signal to one of the signal interfaces and then the other and determining the amplitude and phase differences in the test signal between when it is injected to the one of the signal interfaces and the other; and determining a calibration offset that is equal to the determined amplitude and phase differences in the test signal between when it is injected to the one of the signal interfaces and the other, subtracted from the determined amplitude and phase differences in the received signal between the passive antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for calibrating an antenna system having a first passive antenna and a second passive antenna and first and second signal interfaces, the method comprising:
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supplying a signal to the passive antennas and determining amplitude and phase differences between transmissions of the first and second antennas; passing a test signal through one of the signal interfaces and then the other and determining the amplitude and phase difference in the test signal between when it is passed through the one of the signal interfaces and the other; determining a calibration offset that is equal to the determined amplitude and phase difference in the test signal between when it is passed through the one of the signal interfaces and the other, subtracted from the determined amplitude and phase difference in the transmissions between the first and second antennas. - View Dependent Claims (9, 10, 11, 12, 13, 14, 16)
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15. The method of 8, wherein said supplying a signal is performed in an anechoic environment.
Specification