Low cost radar altimeter with accuracy enhancement

Communications: directive radio wave systems and devices (e.g. – Determining distance – Altimeter

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342122, G01S 1308

Patent

active

054772265

ABSTRACT:
A low cost frequency modulated (FM) radar altimeter system with enhanced accuracy for continuously providing an altitude of a target, comprising a transmitter means for transmitting a carrier modulated output signal towards the target; a receiver means having an altitude output signal for receiving the carrier modulated output signal reflected from the target after a time delay, and for providing an open loop error correction means for correcting errors resulting from nonlinearities in the transmitter means and signal processing delay variations in the receiver means so that the altitude determined is accurate; a coupling means for directing a portion of the carrier modulated output signal to the receiver means, and searching means having a first output directed to the receiver means and a second output directed to the transmitter means and having a symmetrical search output signal with a slope, s.sub.s, and a fixed period for providing continuous and repeated sweeping from a low altitude to a high altitude, an upsweep, and then back down to the low altitude, a downsweep, so that the radar altimeter is in a constant searching mode, and for automatically altering a search rate of the radar altimeter with changes in the slope, s.sub.s, of the search output signal so that the sensitivity of the radar altimeter increases as the slope, s.sub.s, decreases.

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