Method and system for calibrating an antenna array for an aircraft surveillance system
First Claim
1. A method for calibrating an aircraft surveillance system for a protected aircraft, the system having a phased antenna array comprising antenna elements, the method comprising:
- transmitting a first signal from a first antenna element in the antenna array;
receiving the first signal at a third antenna element in the antenna array;
transmitting a second signal from a second antenna element in the antenna array;
receiving the second signal at the third antenna element;
calculating calibration information for the antenna array based on the first and second signals received at the third antenna element; and
wherein the first and second signals constitute interrogation signals transmitted in connection with a Whisper/Shout pulse sequence to locate potential intruding aircraft within a range of the protected aircraft.
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Accused Products
Abstract
In accordance with one aspect of the present invention, a method is provided for calibrating an aircraft surveillance system for a protected aircraft. The system has a phased antenna array comprising antenna elements. The method comprises transmitting a first signal from a first antenna element in the array, and receiving the first signal at a third antenna element. The first signal may represent an interrogation signal transmitted in connection with a surveillance transmit sequence to locate potential intruding aircraft into a range of the protected aircraft. The method further includes transmitting a second signal from a second antenna element and receiving the second signal at the third antenna element. The method also includes calculating calibration information for the antenna array based on the first and second signals received at the third antenna element. During each transmit operation only a single antenna element transmits at one point in time.
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Citations
22 Claims
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1. A method for calibrating an aircraft surveillance system for a protected aircraft, the system having a phased antenna array comprising antenna elements, the method comprising:
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transmitting a first signal from a first antenna element in the antenna array; receiving the first signal at a third antenna element in the antenna array; transmitting a second signal from a second antenna element in the antenna array; receiving the second signal at the third antenna element; calculating calibration information for the antenna array based on the first and second signals received at the third antenna element; and wherein the first and second signals constitute interrogation signals transmitted in connection with a Whisper/Shout pulse sequence to locate potential intruding aircraft within a range of the protected aircraft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for calibrating an aircraft surveillance system for a protected aircraft, the system having a phased antenna array comprising antenna elements, the method comprising:
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transmitting a first interrogation signal from a first antenna element in the antenna array, the first interrogation signal constituting part of a surveillance transmit sequence, wherein the first interrogation signal constitutes part of a Whisper/Shout pulse sequence; receiving the first interrogation signal at a second antenna element in the antenna array; and calculating calibration information for the antenna array based on the first interrogation signal received by the second antenna element. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification