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US 5,898,401 AGranted
Continuous wave radar altimeter
AssigneeGEC-Marconi Limited
InventorRaymond John Walls
Life of this patent
Estimating the term…
Abstract
A continuous wave radar altimeter comprises a pulsed power control (4), operable when the signal-to-noise ratio of the received signal is likely to be too low, to pulse the transmitted power so that the power varies between a non-zero base level and a higher level. The receiver channel (13, 14) is switched off during each transmitted pulse.
Claims6
A continuous wave radar altimeter comprising:
- a pseudo-random code generator;
- a phase modulator for modulating a continuous wave r.f. signal in accordance with code generated by said code generator;
- a transmitter for transmitting said modulated signal;
- pulse means for switching the transmitted power between a non-zero base level and a higher level, with the periods at the higher level being pulses whose separations are of the order of the expected transmit-receive delay, said pulse means including a pseudo-random code generator for varying said pulse separations;
- a receiver for receiving returned modulated signals;
- means, responsive to the pulse means, for rejecting signals received during said transmitted pulses;
- and means for determining the height of the altimeter above ground by correlating a received signal with said transmitted signal.
4 more elements
Dependencies are inferred from the claim text.