Communications: directive radio wave systems and devices (e.g. – Determining distance – With frequency modulation
Patent
1990-07-13
1992-07-28
Barron, Jr., Gilberto
Communications: directive radio wave systems and devices (e.g.,
Determining distance
With frequency modulation
342128, 342 70, C01S 1338, C01S 1393
Patent
active
051344114
ABSTRACT:
A range detection apparatus comprising means for generating high frequency energy over a finite frequency range and for frequency modulating over a limited range of bandwidth the generated signal. A first path provides a phase reference while a second path provides for transmitting and receiving the signal. Along one of the two paths, the frequency modulated signal is phase shifted at a plurality of predetermined frequency values over a finite frequency range of bandwidth and at a predetermined plurality of phase-shifting values (greater than two) and at combinations of phase-shifting and frequency values to improve the relative range resolution. The signal in one path is phase compared to the signal in the second path to produce range measurement signals related to the combined phase shifts of the two paths, the results of the phase comparison, and the combinations of phase states of the phase shifts and frequencies of the frequency modulated signal.
REFERENCES:
patent: 3112481 (1963-11-01), Goldberg
patent: 3150367 (1964-09-01), Harrington
patent: 3789398 (1974-01-01), Erst
patent: 4044354 (1977-08-01), Bosher et al.
patent: 4354192 (1982-10-01), Kohler
patent: 4901083 (1990-02-01), May et al.
Jacobson et al., "Microwave Distance Mekr with .+-.2.5 mm Resolution" Conf. 5th European Microwave, Hamburg, Germany, Sep. 1975.
Barron Jr. Gilberto
General Microwave Corporation
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