CODED APERTURE BEAM ANALYSIS METHOD AND APPARATUS
First Claim
1. An apparatus for determining a direction of arrival of at least one RF signal from at least one source of the at least one RF signal, the apparatus comprising:
- an array of antenna elements for receiving the at least one RF signal;
an array of single bit modulators, each single bit modulator in said array of single bit modulators being coupled with a corresponding antenna element in said array of antenna elements for modulating signals from the corresponding antenna elements according to a multibit code;
a mixer;
a summation network for applying a summation of signals from the array of single bit modulators to said mixer, the mixer converting the summation of signals either to baseband or to intermediate frequency analog signals;
an analog to digital convertor for detecting and converting the baseband or intermediate frequency analog signals from the mixer to corresponding digital signals; and
means for analyzing the corresponding digital signals to determine the direction of arrival of the at least at least one RF signal from the at least one emitting source of the at least one RF signal.
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Accused Products
Abstract
A method and apparatus for determining the range, radial velocity, and bearing angles of scattering objects reflecting RF signals or for determining the range, radial velocity, and bearing angles of sources RF signals. An array of antenna elements is utilized, the array of antenna elements each having an associated two state modulator wherein transmitted and/or received energy is phase encoded according to a sequence of multibit codes, the multibit codes each having two states with approximately a 50% probability for each of the two states occurring in each given multibit code in said sequence of multibit codes, thereby allowing the determination of range, radial velocity, and bearing angles through digital computation after the scattered signals have been received.
79 Citations
21 Claims
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1. An apparatus for determining a direction of arrival of at least one RF signal from at least one source of the at least one RF signal, the apparatus comprising:
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an array of antenna elements for receiving the at least one RF signal; an array of single bit modulators, each single bit modulator in said array of single bit modulators being coupled with a corresponding antenna element in said array of antenna elements for modulating signals from the corresponding antenna elements according to a multibit code; a mixer; a summation network for applying a summation of signals from the array of single bit modulators to said mixer, the mixer converting the summation of signals either to baseband or to intermediate frequency analog signals; an analog to digital convertor for detecting and converting the baseband or intermediate frequency analog signals from the mixer to corresponding digital signals; and means for analyzing the corresponding digital signals to determine the direction of arrival of the at least at least one RF signal from the at least one emitting source of the at least one RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus for determining a direction of arrival of at least one RF signal from at least one source of the at least one RF signal reflected from an object, the apparatus comprising:
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a receiving antenna and a transmitting antenna, at least one of the receiving antenna and the transmitting antenna comprising an array of antenna elements for transmitting or receiving the at least one RF signal; and at least one array of single bit modulators, each single bit modulator in said at least one array of single bit modulators being coupled with a corresponding antenna element in said array of antenna elements for modulating signals for or from the corresponding antenna elements according to a state of a bit at a defined bit position in a sequence of supplied multibit codes, the multibit codes each having two states with approximately a 50% probability for either of the two states occurring in each given multibit code in said sequence of said multibit codes. - View Dependent Claims (17)
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18. A method for determining the range, radial velocity, and bearing angles of scattering objects reflecting signals or for determining the range and bearing angle of sources of signals, the method comprising:
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utilizing an array of antenna elements, the array of antenna elements each having an associated two state modulator, coding transmitted and/or received energy according to a sequence of multibit codes, the multibit codes each having two states with approximately a 50% probability for each of the two states occurring in each given multibit code in said sequence of multibit codes, thereby allowing the determination of range, radial velocity, and bearing angles through digital computation after the scattered signals have been received. - View Dependent Claims (19)
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20. An apparatus for determining a direction of arrival of at least one RF signal from at least one source of the at least one RF signal reflected and/or emitted from an object, the apparatus comprising:
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a receiving antenna comprising an array of antenna elements for receiving the at least one RF signal; and at least one array of single bit phase modulators, each single bit phase modulator in said at least one array of single bit modulators being coupled with a corresponding antenna element in said array of antenna elements for modulating signals from the corresponding antenna elements according to a state of a bit in a sequence of supplied multibit codes, the multibit codes each having two states with approximately a 50% probability for either of the two states occurring in each given multibit code in said sequence of said multibit codes. - View Dependent Claims (21)
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Specification