Phased array transmission device
First Claim
Patent Images
1. A phased array transmission device, comprising:
- an N (N≧
3) number of transmission branches including a first transmission branch and a second transmission branch, the second transmission branch being adjacent to the first transmission branch, each having;
a transmitter which transmits a transmission signal at a radio frequency;
a phase adjuster which adjusts a phase of the transmission signal;
an amplitude adjuster which adjusts an amplitude of the transmission signal; and
a transmission output detector which extracts a part of an output of the transmitter;
an (N−
1) number of inter-branch error detectors, which detect relative errors between adjacent transmission branches, each including;
a signal combiner which combines outputs of the transmission output detectors of the adjacent transmission branches with each other;
a detector which detects a level of an output of the signal combiner; and
an AD converter which converts an analog voltage from the detector into a digital value;
a correction controller which detects phases and amplitudes of the transmission branches according to outputs from the inter-branch error detectors;
a phase controller which controls the phase adjuster based on a result of phase detection by the correction controller; and
an amplitude controller which controls the amplitude adjuster based on a result of amplitude detection by the correction controller.
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Abstract
Transmission output detectors extract transmission outputs of a plurality of transmission branches, and an inter-branch error detector detects a combined signal level of the transmission outputs of the transmission branches to obtain an error detection signal. A correction controller calculates an amplitude error between the transmission branches based on an error detection signal, and calculates a phase error between the transmission branches based on an error detection signal which is obtained by changing the phases of the transmission branches. A phase controller and an amplitude controller correct the amplitude error and the phase error.
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Citations
7 Claims
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1. A phased array transmission device, comprising:
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an N (N≧
3) number of transmission branches including a first transmission branch and a second transmission branch, the second transmission branch being adjacent to the first transmission branch, each having;a transmitter which transmits a transmission signal at a radio frequency; a phase adjuster which adjusts a phase of the transmission signal; an amplitude adjuster which adjusts an amplitude of the transmission signal; and a transmission output detector which extracts a part of an output of the transmitter; an (N−
1) number of inter-branch error detectors, which detect relative errors between adjacent transmission branches, each including;a signal combiner which combines outputs of the transmission output detectors of the adjacent transmission branches with each other; a detector which detects a level of an output of the signal combiner; and an AD converter which converts an analog voltage from the detector into a digital value; a correction controller which detects phases and amplitudes of the transmission branches according to outputs from the inter-branch error detectors; a phase controller which controls the phase adjuster based on a result of phase detection by the correction controller; and an amplitude controller which controls the amplitude adjuster based on a result of amplitude detection by the correction controller. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A phased array transmission device, comprising:
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a first transmission branch and a second transmission branch, each having; a transmitter which transmits a transmission signal at a radio frequency; a phase adjuster which adjusts a phase of the transmission signal; an amplitude adjuster which adjusts an amplitude of the transmission signal; and a transmission output detector which extracts a part of an output of the transmitter; an inter-branch error detector including; a signal combiner which combines outputs of the transmission output detectors of the first transmission branch and the second transmission branch, with each other; a detector which detects a level of an output of the signal combiner; and an AD converter which converts an analog voltage from the detector into a digital value; a correction controller which detects phases and amplitudes of the first transmission branch and the second transmission branch according to an output from the inter-branch error detector; a phase controller which controls the phase adjuster based on a result of phase detection by the correction controller; and an amplitude controller which controls the amplitude adjuster based on a result of amplitude detection by the correction controller, wherein the correction controller controls the phase controller to change the phase adjuster of at least one of the first transmission branch and the second transmission branch, thereby changing a phase between the first and second transmission branches over 360 degrees, detects two phase values at which an output of the inter-branch error detector has a preset reference value, and calculates a phase error as a phase value at which a median value between the two phase values is in-phase and reverse-phase conditions of a phase difference between the first and second transmission branches; and wherein the phase controller adjusts the phase adjusters of the first and second transmission branches based on the phase error which is calculated by the correction controller, thereby correcting the phase error between the two transmission branches.
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Specification