SYSTEMS AND METHODS FOR PERFORMING HIGH ACCURATE DISTANCE MEASURING FOR RADAR ALTIMETERS
First Claim
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1. A method performed on an aircraft, the method comprising:
- simultaneously transmitting a signal having different two or more modulating frequencies;
receiving returns of the signal with two modulating frequencies;
determining the phase of the return of the first modulating signal;
determining the phase of the returned second modulating signal; and
determining a distance value based on the determined phase of the first and second return modulating signals.
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Abstract
Systems and methods for measuring aircraft altitude less than 10 meters. Two signals having different frequencies are simultaneously transmitted. Returns or echos of the two signals are received. The phase of the return of the first and second signals are determined. A distance value based on the determined phase of the first and second return signals is determined.
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Citations
18 Claims
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1. A method performed on an aircraft, the method comprising:
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simultaneously transmitting a signal having different two or more modulating frequencies;
receiving returns of the signal with two modulating frequencies;
determining the phase of the return of the first modulating signal;
determining the phase of the returned second modulating signal; and
determining a distance value based on the determined phase of the first and second return modulating signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An aircraft system comprising:
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a transmitter configured to generate a signal having two or more different modulating frequencies;
an antenna configured to simultaneously transmit the generated signals and receive returns of the transmitted signals;
a receiver configured to process the received returns; and
a processing component configured to determine the phase of the return of the first signal modulating, determine the phase of the returned second modulating signal, and determine a distance value based on the determined phase of the first and second return modulating signals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification