METHODS AND SYSTEMS FOR INTERFEROMETRIC CROSS TRACK PHASE CALIBRATION
First Claim
1. A method to compensate for variances in signal path delays for a plurality of radar return processing channels, said method comprising:
- providing a signal in the signal path between an antenna and a corresponding receiver of each radar return processing channel, wherein providing the signal in the signal path comprises momentarily switching an output of a signal source into each radar return processing channel;
receiving a reflection of the provided signal from each antenna at the corresponding receiver;
measuring phase variances between the reflected signals processed by each receiver; and
adjusting compensation algorithms for each radar return processing channel based on the measured phase variances.
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Accused Products
Abstract
A method to compensate for variances in signal path delays for a plurality of radar return processing channels is described. The method comprises providing a signal in the signal path between an antenna and a corresponding receiver of each radar return processing channel, receiving a reflection of the provided signal from each antenna at the corresponding receiver, measuring phase variances between the reflected signals processed by each receiver, and adjusting compensation algorithms for each radar return processing channel based on the measured phase variances.
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Citations
21 Claims
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1. A method to compensate for variances in signal path delays for a plurality of radar return processing channels, said method comprising:
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providing a signal in the signal path between an antenna and a corresponding receiver of each radar return processing channel, wherein providing the signal in the signal path comprises momentarily switching an output of a signal source into each radar return processing channel; receiving a reflection of the provided signal from each antenna at the corresponding receiver; measuring phase variances between the reflected signals processed by each receiver; and adjusting compensation algorithms for each radar return processing channel based on the measured phase variances. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A radar altimeter comprising:
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a system processor; a plurality of receive antennas; a plurality of receivers; a plurality of receive channels coupled to corresponding said receive antennas and said receivers, said receive channels configured to output processed signals, originating from receptions at said antennas, to said processor; and a signal source switchably coupled to the couplings between said receive antennas and corresponding said receive channels, said antennas thereby reflecting signals from said signal source back toward said receivers, said processor configured to measure phase variances between the reflected signals processed by each said receiver and adjust compensation algorithms programmed therein for each said receive channel based on the measured phase variances. - View Dependent Claims (9, 10, 11, 12, 13)
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14. (canceled)
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15. (canceled)
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16. A radar receiver comprising:
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a plurality of receive channels comprising corresponding receive antennas, said receive channels configured to output processed signals corresponding to receptions at said antennas; a plurality of phase detectors, each said phase detector configured to determine a phase difference between processed signals received from a different pair of said receive channels; a signal source switchably coupled to each of said receive channels, a signal from said signal source configured to reflect from said antennas through said receive channels; and a processor configured to utilize phase differences resulting from the reflected signals to adjust results of subsequent phase difference determinations, the phase differences resulting from the reflected signals indicative of signal delay times between said receive antennas and said phase detectors. - View Dependent Claims (17, 18, 19, 20, 21)
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Specification