Phase array calibration orthogonal phase sequence
First Claim
1. A method of calibrating an array antenna element having a signal with a phase and an amplitude, the method comprising:
- sequentially switching the phase of the antenna element signal through four orthogonal phase states;
measuring the power of the array antenna signal at each of the four orthogonal phase states;
determining a phase error for the antenna element signal as a function of the power of the array antenna signal at each of the four orthogonal phase states; and
adjusting the phase of the antenna element signal by the phase error.
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Accused Products
Abstract
Methods and systems for calibrating an array antenna are described. The array antenna has a plurality of antenna elements each having a signal with a phase and an amplitude forming an array antenna signal. For calibration, the phase of each element signal is sequentially switched one at a time through four orthogonal phase states. At each orthogonal phase state, the power of the array antenna signal is measured. A phase and an amplitude error for each of the element signals is determined based on the power of the array antenna signal at each of the four orthogonal phase states. The phase and amplitude of each of the element signals is then adjusted by the corresponding phase and amplitude errors.
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Citations
20 Claims
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1. A method of calibrating an array antenna element having a signal with a phase and an amplitude, the method comprising:
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sequentially switching the phase of the antenna element signal through four orthogonal phase states; measuring the power of the array antenna signal at each of the four orthogonal phase states; determining a phase error for the antenna element signal as a function of the power of the array antenna signal at each of the four orthogonal phase states; and adjusting the phase of the antenna element signal by the phase error. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for calibrating an array antenna provided with a plurality of antenna elements each having a signal with a phase and an amplitude forming an array antenna signal, the method comprising:
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sequentially switching the phase of each antenna element signal one at a time through four orthogonal phase states; measuring at each orthogonal phase state the power of the array antenna signal; determining a phase error for each of the antenna element signals, wherein the phase error for an antenna element signal is a function of the power of the array antenna signal at each of the four orthogonal phase states; and adjusting the phase of each of the antenna element signals by the corresponding phase error. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An array antenna system comprising:
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an array antenna provided with a plurality of antenna elements each having a signal with a phase and an amplitude forming an array antenna signal; and a calibration processor operable with the array antenna to sequentially switch the phase of each antenna element signal one at a time through four orthogonal phase states and measure at each orthogonal phase state the power of the array antenna signal, the calibration processor further operable to determine a phase error for each of the antenna element signals, wherein the phase error for an antenna element signal is a function of the power of the array antenna signal at each of the four orthogonal phase states, the calibration processor further operable to adjust the phase of each of the antenna element signals by the corresponding phase error. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification