Compact beacon radar and full ATC services system
First Claim
1. A single site beacon transceiver, comprising:
- an omni-directional transceiver;
a plurality of directional receiving antennas providing 360 degrees of coverage for receiving a signal; and
a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein the plurality of receivers are calibrated periodically and said processor estimates a coarse signal azimuth for said signal by calculating an amplitude monopulse ratio for said signal using two of the plurality of directional receiving antennas receiving the highest amplitude signal, and estimates a final signal azimuth for said signal using the estimated coarse signal azimuth and an interferometer baseline between said two of the plurality of directional receiving antennas.
2 Assignments
0 Petitions
Accused Products
Abstract
A system and method for a single site beacon transceiver including an omni-directional transceiver, a plurality of directional receiving antennas for receiving a signal, and a digital receiver for processing the signal to determine an azimuth to the source of the received signal. The digital receiver includes a plurality of receiver channels that are calibrated periodically and at least one processor that estimates a coarse signal azimuth for the signal by calculating an amplitude monopulse ratio for the signal using the two directional receiving antennas receiving the highest amplitude signal, and estimates a final signal azimuth for the signal using an interferometer baseline between the two directional receiving antennas or, alternately, subtracts the complex ratio of the measurements from the complex ratio of the antenna array RF model to determine the angle corresponding to the minimum of the absolute value of the difference.
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Citations
80 Claims
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1. A single site beacon transceiver, comprising:
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an omni-directional transceiver; a plurality of directional receiving antennas providing 360 degrees of coverage for receiving a signal; and a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein the plurality of receivers are calibrated periodically and said processor estimates a coarse signal azimuth for said signal by calculating an amplitude monopulse ratio for said signal using two of the plurality of directional receiving antennas receiving the highest amplitude signal, and estimates a final signal azimuth for said signal using the estimated coarse signal azimuth and an interferometer baseline between said two of the plurality of directional receiving antennas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 59)
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11. A single site beacon transceiver, comprising:
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an omni-directional transceiver, wherein the omni-directional transceiver transmits an interrogation signal; a plurality of directional receiving antennas providing 360 degrees of coverage for receiving a signal; a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein the processing of said signal comprises; calibrating the plurality of receiver channels periodically before estimating the angle of arrival of said signal; determining which two of the plurality of directional receiving antennas received the highest amplitude signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; calculating an amplitude monopulse ratio for said signal; calculating a coarse signal azimuth angle for said signal by converting said signal amplitude monopulse ratio to an azimuth angle relative to the interferometric baseline; calculating an interferometric phase difference for said signal relative to the interferometric baseline; estimating an interferometric azimuth deviation from the calculated coarse signal azimuth angle; and determining a final signal azimuth for said signal using the calculated coarse signal azimuth angle and the estimated interferometric azimuth deviation. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 60)
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20. A single site beacon transceiver, comprising:
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an omni-directional transceiver; a plurality of directional receiving antennas providing 360 degrees of coverage for receiving signals; a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein processing of said signal comprises; calibrating the plurality of directional receiving antennas periodically before estimating the angle of arrival of said signal; determining which two of the plurality of directional receiving antennas received the highest amplitude signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; wherein the processing of said signal uses the following equation to determine an azimuth angle with respect to an interferometer baseline; - View Dependent Claims (21, 22, 23, 61)
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24. A method of localizing targets using a single site compact beacon transceiver, the method comprising:
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transmitting an interrogation signal from an omni-directional transceiver; receiving a reply signal at a plurality of directional receiving antennas providing 360 degrees of coverage for receiving a signal; and processing the received reply signals in a digital receiver, said digital receiver comprising a plurality of receiver channels and at least one processor;
wherein the processing comprises;calibrating the plurality of receiver channels periodically before estimating the angle of arrival of the signal; determining which two of the plurality of directional receiving antennas received the highest amplitude signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; calculating an amplitude monopulse ratio for said signal; calculating a coarse signal azimuth angle for said signal by converting said signal amplitude monopulse ratio to an azimuth angle relative to the interferometric baseline; calculating an interferometric phase difference for said signal relative to the interferometric baseline; estimating an interferometric azimuth deviation from the calculated coarse signal azimuth angle; and determining a final signal azimuth angle for said signal using the calculated coarse signal azimuth angle and the estimated interferometric azimuth deviation. - View Dependent Claims (25, 26, 27, 28, 29, 62)
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30. A single site beacon transceiver, comprising:
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at least one directional transceiver located at a central position in said single site beacon transceiver; a plurality of directional receiving antennas located along a periphery of said single site beacon transceiver providing 360 degrees of coverage for receiving said signal; and a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein said digital receiver periodically calibrates each of the plurality of receiver channels, estimates a coarse signal azimuth for said signal by calculating an amplitude monopulse ratio for said signal using two of the plurality of directional receiving antennas that receive the highest amplitude signal, and estimates a final signal azimuth for said signal using the estimated coarse signal azimuth and an interferometer baseline between said two of the plurality of directional receiving antennas. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 63)
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40. A single site beacon transceiver, comprising:
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at least one directional transceiver located at a central position in said single site beacon transceiver for transmitting a signal and receiving a signal, wherein said at least one directional transceiver transmits an interrogation signal; a plurality of directional receiving antennas located along a periphery of said single site beacon transceiver providing 360 degrees of coverage for receiving signals; and a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein the processing of said signal comprises; calibrating the plurality of receiver channels periodically before estimating the angle of arrival of said signal; determining which two of the plurality of directional receiving antennas received the highest amplitude signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; calculating an amplitude monopulse ratio for said signal; calculating a coarse signal azimuth angle for said signal by converting said signal amplitude monopulse ratio to an azimuth angle relative to the interferometric baseline; calculating an interferometric phase difference for said signal relative to the interferometric baseline; estimating an interferometric azimuth deviation from the calculated coarse signal azimuth angle; and determining a final signal azimuth for said signal using the calculated coarse signal azimuth angle and the estimated interferometric azimuth deviation. - View Dependent Claims (41, 42, 43, 44, 45, 46, 47, 48, 64)
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49. A single site beacon transceiver, comprising:
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at least one directional transceiver located at a central position in said single site beacon transceiver; a plurality of directional receiving antennas located along a periphery of said single site beacon transceiver providing 360 degrees of coverage for receiving said signal; and a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein processing of said signal comprises; calibrating the plurality of receiver channels periodically before estimating the angle of arrival of said signal; determining which two of the plurality of directional receiving antennas received the highest amplitude signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; wherein the processing of said signal uses the following equation to determine an azimuth angle with respect to an interferometer baseline; - View Dependent Claims (50, 51, 52, 65)
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53. A method of localizing targets using a single site beacon transceiver, the method comprising:
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transmitting an interrogation signal from at least one of the at least one directional transceivers located at a central position in said single site beacon transceiver; receiving a reply signal at a plurality of directional receiving antennas providing 360 degrees of coverage for receiving signals; and processing the received reply signals in a digital receiver, said digital receiver comprising a plurality of receiver channels and at least one processor;
wherein the processing comprises;calibrating the plurality of receiver channels periodically before estimating the angle of arrival of the signal; determining which two of the plurality of directional receiving antennas received the highest amplitude a signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; calculating an amplitude monopulse ratio for said signal; calculating a coarse signal azimuth angle for said signal by converting said signal amplitude monopulse ratio to an azimuth angle relative to the interferometric baseline; calculating an interferometric phase difference for said signal relative to the interferometric baseline; estimating an interferometric azimuth deviation from the calculated coarse signal azimuth angle; and determining a final signal azimuth angle for said signal using the calculated coarse signal azimuth angle and the estimated interferometric azimuth deviation. - View Dependent Claims (54, 55, 56, 57, 58, 66)
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67. A single site beacon transceiver, comprising:
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an omni-directional transceiver; at least one directional receiving antenna; a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein processing of said signal comprises; calibrating the plurality of receiver channels periodically before estimating the angle of arrival of said signal; determining which two of the plurality of directional receiving antennas received the highest amplitude signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; wherein the processing of said signal uses two interferometer baselines in the following equation to determine an azimuth angle with respect to an interferometer baseline; - View Dependent Claims (68, 69, 70, 75, 76, 77)
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71. A single site beacon transceiver, comprising:
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at least one directional transceiver located at a central position in said single site beacon transceiver; a plurality of directional receiving antennas located along a periphery of said single site beacon transceiver providing 360 degrees of coverage for receiving said signal; and a digital receiver for processing said signal, said digital receiver comprising a plurality of receiver channels and at least one processor, wherein processing of said signal comprises; calibrating the plurality of directional receiving antennas periodically before estimating the angle of arrival of said signal; determining which two of the plurality of directional receiving antennas received the highest amplitude signal; determining an interferometric baseline between said two of the plurality of directional receiving antennas; downconverting, digitizing and transforming said signal at each of said two of the plurality of directional receiving antennas into a numerical representation of said signal; calculating a numerical representation of a complex envelope from the numerical representation of said signal for each of said two of the plurality of directional receiving antennas; wherein the processing of said signal uses two interferometer baselines and the following equation to determine an azimuth angle with respect to an interferometer baseline; - View Dependent Claims (72, 73, 74, 78, 79, 80)
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Specification