Phase calibration method and apparatus
First Claim
1. A phase calibration method of a phased array antenna for inserting a calibration signal into a transmit signal, inputting the resultant signal to a prescribed circuit and calibrating phase of the transmit signal using the calibration signal, which is contained in an output signal from said circuit, comprising the steps of:
- extracting the calibration signal by subtracting the transmit signal from the output signal of said circuit;
estimating the phase characteristic of said circuit based upon a change in phase of the calibration signal; and
subjecting the transmit signal to a phase adjustment having a characteristic that is opposite the phase characteristic.
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Accused Products
Abstract
Disclosed is a phase calibration method for inserting a calibration signal (SC) into main signals (SM1 to SMn) of a plurality of branches in turn, estimating the phase characteristic of an analog circuit to which a respective one of the main signals is input and calibrating the phase of each main signal. The method includes steps of outputting a first combined signal obtained by combining output signals from the analog circuits (62a to 62n) in all branches, outputting a second combined signal obtained by combining the main signals in all branches, extracting the calibration signal by removing the second combined signal from the first combined signal in a calibration signal extracting unit (64), estimating the phase characteristics of the analog circuits, to which the main signals having the inserted calibration signal are input, based upon a change in phase of the calibration signal, and subjecting the main signals to phase adjustment having characteristics that are opposite the phase characteristics.
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Citations
23 Claims
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1. A phase calibration method of a phased array antenna for inserting a calibration signal into a transmit signal, inputting the resultant signal to a prescribed circuit and calibrating phase of the transmit signal using the calibration signal, which is contained in an output signal from said circuit, comprising the steps of:
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extracting the calibration signal by subtracting the transmit signal from the output signal of said circuit; estimating the phase characteristic of said circuit based upon a change in phase of the calibration signal; and subjecting the transmit signal to a phase adjustment having a characteristic that is opposite the phase characteristic.
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2. A phase calibration method of a phased array antenna for inserting a calibration signal into transmit signals in a plurality of branches in turn, estimating a phase characteristic of a circuit to which a respective one of the transmit signals is input and calibrating phase of each transmit signal, comprising the steps of:
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outputting a first combined signal obtained by combining output signals from said circuit in all branches, and outputting a second combined signal obtained by combining the transmit signals in all branches; extracting the calibration signal by removing the second combined signal from the first combined signal; estimating phase characteristics of said circuits, to which the transmit signals having the inserted calibration signal are input, based upon a change in phase of the calibration signal; and subjecting the transmit signals to phase adjustment having characteristics that are opposite said phase characteristics. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A phase calibration apparatus of a phased array antenna for inserting a calibration signal into transmit signals in a plurality of branches in turn, estimating a phase characteristic of a circuit to which each transmit signal is input and calibrating phase of each transmit signal, comprising:
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a calibration signal inserting unit for inserting a calibration signal into transmit signals in a plurality of branches in turn; a first combining circuit for outputting a first combined signal by combining output signals from said circuit in all branches; a second combining circuit for outputting a second combined signal by combining the transmit signals in all branches; a calibration signal extracting unit for extracting the calibration signal by removing the second combined signal from the first combined signal; and a phase adjusting unit for estimating phase characteristics of said circuits, to which the transmit signals having the inserted calibration signal are input, based upon a change in phase of the calibration signal, and subjecting the transmit signals to phase adjustment having characteristics that are opposite said phase characteristics. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification