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US 11,705,974 B2Granted
Efficient in-situ radiative loop-back AESA calibration and prognostic health monitoring
AssigneeRockwell Collins, Inc.
InventorsJames B. West, Jeffery A. Finley
Life of this patent
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Abstract
A system and method for real-time in-situ calibration of an Active Electronically Scanned Array (AESA) utilizes an S-parameter matrix-based EM transfer function between an end fire, unobtrusive, near field probe radiating element to minimize AESA look angle blockage. A sniffer probe is integrated in the AESA aperture of mechanical mounting frame or embedded with the AESA aperture structure. Hadamard orthogonal coding is utilized to simultaneously energize AESA elements.
Claims15
An apparatus for calibrating an Active Electronically Scanned Array (AESA) comprising:
- at least one near-field transmit probe;
- at least one near-field receive probe;
- and
- a calibration circuit,
- where:
- the calibration circuit is configured to:
- apply signals to the at least one near-field transmit probe and at least one near-field receive probe, the signals comprising uncorrelated RF channel signals with orthogonal phase coding, and receive measurements from the at least one near-field transmit probe and the at least one near-field receive probe and apply a Hadamard matrix algorithm to the measurements to determine one or more performance metrics;
- and
- simulate a relationship between stimuli and mutual coupling via fractional array testing.
6 more elements
A system comprising:
- an Active Electronically Scanned Array (AESA);
- at least one half-duplex near-field probe disposed proximal to the aperture of the AESA;
- and
- a calibration circuit,
- where:
- the calibration circuit is configured to:
- apply signals to the at least one near-field transmit probe and at least one near-field receive probe, the signals comprising uncorrelated RF channel signals with orthogonal phase coding, and receive measurements from the at least one half-duplex near-field probe and apply a Hadamard matrix algorithm to the measurements to determine one or more performance metrics;
- and
- simulate a relationship between stimuli and mutual coupling via fractional array testing.
6 more elements
Dependencies are inferred from the claim text.