TRACKING APPARATUS AND METHOD FOR AIRBORNE TARGETS
First Claim
1. An apparatus for determining location information for an airborne target, the apparatus comprising:
- a signal generation module configured to synthesize a cyclic transmit signal having a fixed frequency slope over a substantial portion of each cycle;
an antenna array comprising at least one transmit antenna configured to emit an electromagnetic beam corresponding to the cyclic transmit signal wherein the electromagnetic beam spans more than 30 degrees in elevation and less than 12 degrees in azimuth;
the antenna array further comprising at least two receive antennas that are vertically offset and configured to provide a corresponding plurality of vertically offset return signals;
a down-conversion module configured to down-convert the plurality of vertically offset return signals with the cyclic transmit signal to provide a corresponding plurality of baseband signals;
a magnitude and phase extraction module configured to receive the plurality of baseband signals and provide magnitude and phase information for each return baseband signal as a function of range; and
a target tracking module configured to receive the phase information and determine elevation information for an airborne target.
1 Assignment
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Accused Products
Abstract
A method for determining location information for an airborne target includes synthesizing a cyclic transmit signal, transmitting an electromagnetic beam corresponding to the cyclic transmit signal, providing a plurality of vertically offset return signals corresponding to at least two receive antennas that are vertically offset, down-converting the plurality of vertically offset return signals with the cyclic transmit signal to provide a corresponding plurality of baseband signals, determining magnitude and phase information for each vertically offset return signal as a function of range from the corresponding baseband signal, and determining elevation information for an airborne target from the magnitude and phase information. Azimuthal information for the airborne target may be determined by tracking amplitude variations in the return signal in response to azimuthal rotation of the receive antennas. A corresponding apparatus, system, and computer readable medium are also disclosed herein.
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Citations
20 Claims
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1. An apparatus for determining location information for an airborne target, the apparatus comprising:
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a signal generation module configured to synthesize a cyclic transmit signal having a fixed frequency slope over a substantial portion of each cycle; an antenna array comprising at least one transmit antenna configured to emit an electromagnetic beam corresponding to the cyclic transmit signal wherein the electromagnetic beam spans more than 30 degrees in elevation and less than 12 degrees in azimuth; the antenna array further comprising at least two receive antennas that are vertically offset and configured to provide a corresponding plurality of vertically offset return signals; a down-conversion module configured to down-convert the plurality of vertically offset return signals with the cyclic transmit signal to provide a corresponding plurality of baseband signals; a magnitude and phase extraction module configured to receive the plurality of baseband signals and provide magnitude and phase information for each return baseband signal as a function of range; and a target tracking module configured to receive the phase information and determine elevation information for an airborne target. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer-implemented method for determining location information for an airborne target, the method comprising:
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synthesizing a cyclic transmit signal having a fixed frequency slope over a substantial portion of each cycle; transmitting an electromagnetic beam corresponding to the cyclic transmit signal wherein the electromagnetic beam spans more than 30 degrees in elevation and less than 12 degrees in azimuth; providing a plurality of vertically offset return signals corresponding to at least two receive antennas that are vertically offset; down-converting the plurality of vertically offset return signals with the cyclic transmit signal to provide a corresponding plurality of baseband signals; determining magnitude and phase information for each vertically offset return signal as a function of range from the corresponding baseband signal; and determining elevation information for an airborne target from the magnitude and phase information. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A non-transitory computer readable medium having computer executable instructions stored thereon that when executed by a digital processing apparatus cause the digital processing apparatus to conduct a method for determining location information for an airborne target, the method comprising:
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synthesizing a cyclic transmit signal having a fixed frequency slope over a substantial portion of each cycle; transmitting an electromagnetic beam corresponding to the cyclic transmit signal wherein the electromagnetic beam spans more than 30 degrees in elevation and less than 12 degrees in azimuth; providing a plurality of vertically offset return signals corresponding to at least two receive antennas that are vertically offset; down-converting the plurality of vertically offset return signals with the cyclic transmit signal to provide a corresponding plurality of baseband signals; determining magnitude and phase information for each vertically offset return signal as a function of range from the corresponding baseband signal; and determining elevation information for an airborne target from the magnitude and phase information.
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- 15. The computer readable medium of claim 15, wherein the method further comprises determining azimuthal information for the airborne target.
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16. The computer readable medium of claim 16, wherein azimuthal information is determined by tracking amplitude variations in the return signal, or the signal corresponding thereto, in response to azimuthal rotation of the receive antennas.
Specification