Phase only bearing mesurement with amiguity correction in a collision avoidance system
First Claim
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1. Apparatus for measuring bearing of a target from a signal transmitted by the target, comprising:
- an antenna array having a first, a second, a third and a fourth element, each of said antenna elements being circumferentially spaced;
a first, a second and a third receiver, each of said receivers having an input and an output;
a first and second phase detector, each having a first input, a second input and an output;
first switching means for making a first measurement by connecting said first element to said input of said first receiver, said second element to said input of said second receiver, said fourth element to said input of said third receiver, said output of said first receiver to said first input of said first and said second phase detectors, said output of said second receiver to said second input of said first phase detector and said output of said third receiver to said second input of said second phase detector and for making a second measurement by connecting said third element to said input of said first receiver, said fourth element to said input of said second receiver and said second element to said input of said third receiver, said output of said first receiver to said second input of said first and said second phase detector, said output of said second receiver to said first input of said first phase detector, and said output of said third receiver to said first input of said second phase detector; and
means for determining target bearing from said first and second measurements.
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Abstract
A receiver system for measuring the bearing of a target having ambiguity correction. The receiver system includes a four element antenna array, three receivers and two phase detectors. The system further includes switching means for selectively connecting the antenna elements to the receivers and the receivers to the phase detectors to obtain two pairs of bearing components, from which the target bearing is computed.
23 Citations
12 Claims
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1. Apparatus for measuring bearing of a target from a signal transmitted by the target, comprising:
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an antenna array having a first, a second, a third and a fourth element, each of said antenna elements being circumferentially spaced; a first, a second and a third receiver, each of said receivers having an input and an output; a first and second phase detector, each having a first input, a second input and an output; first switching means for making a first measurement by connecting said first element to said input of said first receiver, said second element to said input of said second receiver, said fourth element to said input of said third receiver, said output of said first receiver to said first input of said first and said second phase detectors, said output of said second receiver to said second input of said first phase detector and said output of said third receiver to said second input of said second phase detector and for making a second measurement by connecting said third element to said input of said first receiver, said fourth element to said input of said second receiver and said second element to said input of said third receiver, said output of said first receiver to said second input of said first and said second phase detector, said output of said second receiver to said first input of said first phase detector, and said output of said third receiver to said first input of said second phase detector; and means for determining target bearing from said first and second measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification