Range determining system

Details Range determining system Range determining system

1979-05-04

1981-07-14

Tubbesing, T. H.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

G01S 1378

Patent

active

042789770

ABSTRACT:
A range finding method and system comprising an interrogator and a transponder. The interrogator generates a signal with a first portion comprising a carrier signal amplitude modulated by a first two-level iterative pseudo random sequence (PRS) whose level changes coincide with level changes of a first two-level tone of frequency f.sub.T, which phase modulates said first portion. A second portion of the signal is phase modulated by the product of the PRS and said first tone. The transponder tracks the received interrogation signal and then generates and transmits a responsive signal having first and second portions comprised of a carrier signal phase modulated by a second two-level tone phase synchronized with the received first tone. The first portion is further amplitude modulated by a second iterative PRS phase synchronized with the received PRS signal, and the second portion is further phase modulated by the second, phase synchronized PRS. In response to the responsive signal, the interrogator generates a tracking tone of frequency f.sub.T, precisely phase locked by means including an arithmetic synthesizer, with the received second tone. The phases of the received second PRS and the originally generated first PRS are compared to determine the round-trip signal propagation time and thus the range.

REFERENCES:
patent: 3530467 (1970-09-01), Attwood et al.
patent: 3530470 (1970-09-01), Sheftelman
patent: 3900873 (1975-08-01), Bouvier et al.
patent: 4012696 (1977-03-01), Fletcher et al.
patent: 4045796 (1977-08-01), Kline, Jr.
patent: 4128835 (1978-12-01), Russell

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