Communications: directive radio wave systems and devices (e.g. – Determining distance – With remote cooperating station
Patent
1988-09-08
1990-04-03
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With remote cooperating station
342127, G01S 1332
Patent
active
049147358
ABSTRACT:
A propagation time detecting system wherein a transmitting station transmits to a receiving station, over a plurality of transmitting paths or lines having different propagation times, a transmission signal comprising a sequence of transmission data digitized by a clock signal of a clock frequency. The receiving station receives the transmission signal through the respective transmitting paths or lines as different received signals, and reproduces the sequence of transmission data and the clock signal as different reproduced sequences of transmission data and different reproduced clock signals, from which differences are detected among the different propagation times. In order to improve the accuracy of the detected differences, at least one subcarrier signal with a frequency higher than the clock frequency is also transmitted together with the transmission signal. The receiving station also reproduces the subcarrier signals as different reproduced subcarrier signals which are compared with each other to determine time differences therebetween with a reduced time order. In an application to a radar system, the transmission signal including the subcarrier signal is compared with an echo of the transmission signal from an target to determine the propagation time between the radar and the target.
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patent: 4216472 (1980-08-01), Albanese
patent: 4346382 (1982-08-01), Bose et al.
patent: 4370653 (1983-01-01), Crowley
patent: 4633198 (1986-12-01), Goetz et al.
patent: 4652838 (1987-03-01), Nossen
patent: 4758839 (1988-07-01), Goebel et al.
NEC Corporation
Sotomayor John B.
Tarcza Thomas H.
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