Phase comparator system

Details Phase comparator system Phase comparator system

1980-07-21

1983-01-25

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 7PL, G01S 1378

Patent

active

043706533

ABSTRACT:
An improved interrogation means in a range finding system having signal generating means for generating interrogation signals having a first encoded portion and a first basic tone portion. A transponder means responds to said interrogation signal to generate and transmit a responsive signal having a second encoded portion and a second basic tone portion phase synchronous with said first encoded and basic tone portions as received at the transponder. The interrogator means has further means for storing the phases of the first encoded and basic tone portions after transmission thereof and other means for determining the difference between the stored phase of the first encoded portion and the phase of the received second encoded portion. A third means determines the difference between the stored phase of the first basic tone portion and the phase of the received second basic tone portion to produce a first signal whose frequency is proportional to said phase difference and a second signal indicating the leading or lagging phase relationship of said first and second basic tones. Up/down counter means counts at a rate determined by the frequency of said first signal and in a direction determined by said second signal. The signal generating means responds to the count in said up/down counter to alter the stored phase of said first basic tone portion to become phase synchronized with the phase of said received second basic tone.

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