Multiple-beam antenna system
First Claim
1. A holographic multiple-beam antenna system capable of forming a plurality of beams at one time in different directions, comprising:
- an antenna array having a plurality of element antennas arranged in a predetermined configuration;
a plurality of receiver means each connected to the corresponding one of said element antennas for phase-detecting the signal received by said corresponding element antenna so as to output a digital complex signal which includes amplitude information and phase information;
a plurality of correction means each adapted to receive the digital complex signal output from the corresponding receiver means and operable to correct the received digital complex signal on the basis of correction data preset in accordance with changes in characteristics of amplitude and/or phase that have occurred in the receiving path from said element antenna to said receiver means corresponding thereto, thereby removing the amplitude and/or phase errors from the digital complex signal; and
multiple-beam forming means adapted to receive the corrected digital complex signals output from said plurality of correction means and to perform signal processing for forming a plurality of beams, whereby amplitude and/or phase errors occurring in the receiving paths are removed from the digital complex signals to enable highly accurate beams to be formed.
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Accused Products
Abstract
A multiple-beam antenna system capable of forming a plurality of beams at one time in different directions. The antenna system has a plurality of element antennas arranged in a predetermined configuration. A signal received by each element antenna is converted to a digital signal which in turn is subjected to a Fourier transform. The Fourier-transformed receiving signal is multiplied with a Fourier-transformed weighting function. The resultant product is subjected to an inverse Fourier transform to be used for calculating an antenna radiation pattern. A holographic multiple-beam antenna is also disclosed.
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Citations
7 Claims
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1. A holographic multiple-beam antenna system capable of forming a plurality of beams at one time in different directions, comprising:
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an antenna array having a plurality of element antennas arranged in a predetermined configuration; a plurality of receiver means each connected to the corresponding one of said element antennas for phase-detecting the signal received by said corresponding element antenna so as to output a digital complex signal which includes amplitude information and phase information; a plurality of correction means each adapted to receive the digital complex signal output from the corresponding receiver means and operable to correct the received digital complex signal on the basis of correction data preset in accordance with changes in characteristics of amplitude and/or phase that have occurred in the receiving path from said element antenna to said receiver means corresponding thereto, thereby removing the amplitude and/or phase errors from the digital complex signal; and multiple-beam forming means adapted to receive the corrected digital complex signals output from said plurality of correction means and to perform signal processing for forming a plurality of beams, whereby amplitude and/or phase errors occurring in the receiving paths are removed from the digital complex signals to enable highly accurate beams to be formed. - View Dependent Claims (2, 3)
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4. A holographic multiple-beam antenna system capable of forming a plurality of beams at one time in different directions, comprising:
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an antenna array having a plurality of element antennas; a plurality of receiver means each connected to the corresponding one of said element antennas for phase-detecting the signal received by the corresponding element antenna so as to output a digital complex signal which includes amplitude information and phase information; a plurality of correction means each adapted to receive the digital complex signal output from the corresponding receiver means and operable to correct the received digital complex signal on the basis of correction data preset in accordance with changes in characteristics of amplitude and/or phase that have occurred in the receiving path from said element antenna to said receiver means corresponding thereto, thereby removing the amplitude and/or phase errors from the digital complex signal; multiple-beam forming means adapted to receive the corrected digital complex signals output from said plurality of correction means and to perform signal processing for forming a plurality of beams, whereby the amplitude and/or phase errors occurring in the receiving paths are removed from the digital complex signals to enable highly accurate beams to be formed; transmission means capable of transmitting a test wave to said antenna array at a predetermined time; and setting means operable to detect the amplitude and/or phase characteristics of the respective receiving paths on the basis of the digital signals output from the respective element antennas when they receive the test wave so as to cause correction data corresponding to the detected characteristics of the receiving paths to be set in the respective correction means, whereby the amplitude and/or phase errors occurring in the receiving paths are removed from the digital complex signals to enable highly accurate beams to be formed. - View Dependent Claims (5, 6, 7)
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Specification