Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1985-07-08
1987-04-21
Tubbesing, T. H.
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342 68, 342193, G01S 1332
Patent
active
046600400
ABSTRACT:
A carrier frequency is frequency modulated with a triangular wave and transmitted from a sensor to a target having relative motion to the sensor. The reflection from the target is received and mixed with a portion of the transmitted signal. At least two harmonics of the modulating frequency are filtered from the output of the mixer. Each harmonic is synchronously detected with an harmonic of the same frequency to obtain a doppler signal that is detected and fed to a comparator. Each harmonic, and its corresponding doppler envelope, amplitude peaks at a respective range to the target. When the doppler of one harmonic exceeds the doppler of another harmonic in amplitude, a predetermined range to the target is signaled by the comparator.
REFERENCES:
patent: 2907023 (1959-09-01), Skinner
patent: 3149330 (1964-09-01), Flocco
patent: 3173138 (1965-03-01), Erst
patent: 3339198 (1967-08-01), Glegg
patent: 3343164 (1967-09-01), Clarke
patent: 3789398 (1974-01-01), Erst
patent: 3992711 (1976-11-01), Stoakes
patent: 4302758 (1981-11-01), Tomasi
patent: 4354192 (1982-10-01), Kohler
Briody Thomas A.
Magnavox Government and Industrial Electronics Company
Seeger Richard T.
Streeter William J.
Tubbesing T. H.
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