Communications: radio wave antennas – Antennas – Balanced doublet - centerfed
Patent
1984-02-24
1985-03-19
Blum, Theodore M.
Communications: radio wave antennas
Antennas
Balanced doublet - centerfed
343 7AG, G01S 734, G01S 1358
Patent
active
RE0318515
ABSTRACT:
An improved system for processing an electrical velocity information signal in a velocity detecting system in which a detector is utilized for developing an electrical information signal, such as a Doppler signal, having a characteristic (e.g. frequency) that varies systematically with the object's velocity. A converter develops an oscillatory signal having a frequency which varies in accordance with the velocity information signal characteristic. A tracking filter having a center frequency that varies with the oscillatory signal filters all frequencies other than the center frequency. A signal generator is responsive to the frequency of the signal passed by the tracking filter for generating an output signal having a frequency which is a preset ratio relative to the center frequency, whereby the output signal of the system is relatively noise-free and has a frequency which represents the velocity of the object being detected. Another feature of the disclosed embodiment of the invention utilizes a switching network comprising a pair of flip-flops and a pair of shift registers which are responsive to the oscillatory signal passed by the tracking filter and to an oscillatory signal generated by a voltage-controlled oscillator for alternately charging and discharging a storage capacitor which is coupled to the inverting input of an operational amplifier used as a comparator. A variable resistance is placed in either the charging or discharging path and the output of the op amp is used as an error voltage to control the frequency of the VCO to thus provide a frequency locked loop.
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Blum Theodore M.
Dickey-john Corporation
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