Communications: electrical – Systems – Call station
Patent
1974-10-21
1977-06-14
Swann, III, Glen R.
Communications: electrical
Systems
Call station
212 39P, 390258D, 343225, G08B 2100
Patent
active
040300889
ABSTRACT:
A position detecting and control system for a vehicle includes a low frequency transmitter and associated antenna and a receiver and associated antenna, one of the antennas being mounted on the vehicle so the distance between the antenna carried by the vehicle and the other antenna is determined by the amplitude of the signal induced in the receiving antenna. The frequency of the transmitter is such that the distances to be monitored are a small fraction of the wavelength of the frequency involved, and any significant signal variations due to signal reflections which can reinforce or cancel the received signal are avoided. The system monitors at least two different spacings between the transmitting and receiving antennas where the signals received at the receiving antenna are of widely different orders of magnitude. Separate range detecting circuits are coupled to a common point of the receiver, each of which includes an attenuator at the input thereof for adjusting the level of the signal to be fed to an associated signal level detector which operates a control device when the signal at the receiver output point involved reaches a level indicating the associated spacing to be monitored.
REFERENCES:
patent: 2188293 (1940-01-01), Williams
patent: 2762913 (1956-09-01), Jepson
patent: 3138357 (1974-06-01), Whitwell et al.
patent: 3419847 (1968-12-01), Bonney
patent: 3537006 (1970-10-01), Hampton
Dynascan Corporation
Swann III Glen R.
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