High doppler rate high altitude capability coherent pulsed...

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G01S 13/53 (2006.01) G01S 13/20 (2006.01) G01S 13/22 (2006.01) G01S 13/70 (2006.01) G01S 7/40 (2006.01) G01S 13/02 (2006.01) G01S 13/18 (2006.01) G01S 13/88 (2006.01)

Patent

CA 2082174

A pulse Doppler radar altimeter designed to resolve the ambiguous range problem associated with the use of a pulse repetition interval, which is less than the aircraft altitude, includes a radar transmitter configured to transmit first and second series of pulses where the first series has a pulse repetition interval slightly different from the pulse repetition interval of the second series. At a time when the first series is being transmitted, the receiver electronics including a range gate and a tracker searches for ground returns and positions the range gate in time coincidence with the detected ground return. Control then shifts so that the second series of pulses is transmitted and a determination is made whether overlap of the range gate with the ground return from the second series corresponds to the same altitude as when the first series was involved. If not, it is known that the detected range is ambiguous and the tracker continues repositioning the range gate (altitude) until an unambiguous range determination is made.

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