Phase locked detector

Details Phase locked detector Phase locked detector

1977-05-02

1978-08-15

Wilbur, Maynard R.

Communications: radio wave antennas

Antennas

Balanced doublet - centerfed

343 12R, 343 14, 343 5PD, 340552, G01S 940, G01D 2104

Patent

active

041076842

ABSTRACT:
A microwave or ultrasonic detection system is disclosed which has a voltage controlled transmitter oscillator. The output of the transmitter oscillator is transmitted into a designated area from a transmit antenna and is reflected by objects in the area and received by means of a second antenna. The reflected signal is phase compared to the output of the transmitter oscillator. A phase error signal is generated that varies with the phase difference, and this signal is input to the transmitter oscillator to cause the frequency of the oscillator to vary in such a way to produce a null phase difference. When the position of an object which reflects the transmitted signal is changed, the length of the propagation path for the signal changes which produces a phase error signal. This phase error signal in turn causes the transmitter oscillator to shift frequency. Thus, either the output of the phase comparator or a change in the frequency of the output of the transmitter oscillator indicates a change in position of objects in the field of the transmitted signal. Range to the object is measured by phase locking at two ranges which differ by a known distance.

REFERENCES:
patent: RE27786 (1973-10-01), Roth
patent: 3246322 (1966-04-01), Kuecken
patent: 3649123 (1972-03-01), Ulicki
patent: 3730628 (1973-05-01), Wolcott et al.
patent: 3754222 (1973-08-01), Eisenberg
patent: 3973259 (1976-08-01), Hellgren et al.
patent: 4037161 (1977-07-01), Westell

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