Method and apparatus for automatically calibrating a radio...

Details Method and apparatus for automatically calibrating a radio... Method and apparatus for automatically calibrating a radio...

G - Physics

01

S

343/1

G01S 7/40 (2006.01) G01S 13/34 (2006.01)

Patent

CA 1114480

METHOD AND APPARATUS FOR AUTOMATICALLY CALIBRATING A RADIO ALTIMETER Abstract of the Disclosure A method and apparatus for automatically calibrating and correcting for nonlinearities in a CWFM radio altimeter transmitter frequency sweep includes a coupling element to sample the transmitted signal. A calibration delay line receives and delays the sampled signal, and a mixer recombines the delayed signal with the currently sampled transmitted signal to provide a calibration signal for use as a time base against which the ground reflected transmitted signal also mixed with the currently transmitted signal is compared. The calibration signal, derived from the actual transmitted signal, varies in accordance with nonlinearities of the transmitted frequency sweep and thereby cancels the effects of such nonlinearities in the ground returned mixed signal. A phase locked loop to which the calibration signal is applied generates pulses at a higher frequency to increase the resolution available for determining the period of the ground returned signal. A period converter which receives the ground returned mixed signal as well as the calibration signal for compari- son therebetween provides outputs that can be accumulated and processed by a microprocessor and associated memory for output to derive appropriate altitude indicators. -1-

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