FMCW system for providing search-while-track functions and altit

Details FMCW system for providing search-while-track functions and altit FMCW system for providing search-while-track functions and altit

1982-07-26

1985-04-02

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 12A, 343 14, G01S 1332

Patent

active

045090491

ABSTRACT:
An FMCW distance measuring system is disclosed which provides a search and track function for enabling searching for nearer returns during altitude tracking, and for more accurately determining altitude rate. A portion of the transmitted wave in an FMCW altimeter is mixed with the received signal indicating distance to target to produce a beat frequency between the transmitted wave and the received wave. The transmitted wave is triangularly modulated to produce separate upsweep and downsweep modulations which are maintained to produce a constant beat frequency from the return signal. The up and downsweep of the triangular modulation are independently operable so that tracking may be maintained on either or both of the sweeps or one sweep may track while the other sweep is searching for a nearer return. By comparing the difference in the modulation slopes during the up and downsweep, a reading can be provided which is indicative of the rate of change in altitude. The operation thus allows altitude searching during nearest return tracking along with a combined instantaneous reading of altitude rate without additional circuitry.

REFERENCES:
patent: 2928085 (1960-03-01), Katz
patent: 4146890 (1979-03-01), Klensch
patent: 4367473 (1983-01-01), Marin et al.

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