Multiplex communications – Wide area network – Packet switching
Patent
1980-01-24
1981-11-24
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
370 85, 34082554, 367 79, H04J 302
Patent
active
043028357
ABSTRACT:
An apparatus for multiplexing a plurality of sensor signals onto a common transmission line without employing electrically active devices at each sensor. A modulated carrier signal is coupled to propagate along the common transmission line to a plurality of sensor terminals wherefrom portions of the carrier signal energy are coupled to the sensors for the inclusion of data signals and returned therefrom to propagate through a common transmission line to a common demodulator. Modulated carrier signals from each sensor are distinguished by providing a different round trip path length for each sensor, thus establishing unique round trip time delays. These time delays may be utilized with pulse amplitude modulation applied to the carrier signals and concomitant pulse amplitude modulated carrier signal returns that may be resolved by determining the time of arrival or with linear fm cw amplitude modulation applied to the carrier signal and concomitant delayed linear fm cw returns which may be resolved by determining a constant frequency difference between the linear fm cw signal applied to the carrier signal coupled to the transmission line and the linear fm cw signals returned from each sensor.
REFERENCES:
patent: 3990036 (1976-11-01), Savit
patent: 3996553 (1976-12-01), Siems et al.
patent: 4089584 (1978-05-01), Polczynski
patent: 4117448 (1978-09-01), Siems
Levine Seymour
Olms Douglas W.
Sperry Corporation
Terry Howard P.
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