Communications: directive radio wave systems and devices (e.g. – Return signal controls radar system – Transmitter
Patent
1986-09-02
1988-06-28
Tarcza, Thomas H.
Communications: directive radio wave systems and devices (e.g.,
Return signal controls radar system
Transmitter
331 4, G01S 1332
Patent
active
047542772
ABSTRACT:
A circuit and method for generating an output signal having an output frequency that varies linearly with time, and an FM CW radar system utilizing such a circuit. The circuit includes a VCO, a rate detector, a phase detector, a filter and an integrator. The VCO produces an output signal at its output terminal at an output frequency that corresponds to the voltage of a tuning signal applied to the VCO input terminal. The rate detector receives the output signal and produces a rate signal having a rate frequency that corresponds to the rate of change of the output frequency. The phase detector compares the rate signal to a reference signal having a fixed frequency, and produces a correction signal corresponding to the phase difference between the rate and reference signals. The filter filters the correction signal to produce a first current signal, and the integrator integrates the first current signal to produce the tuning signal. The circuit may also include a current source for producing a constant magnitude second current signal, in which case the integrator integrates the combined first and second current signals to produce the tuning signal.
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Swann Tod
Tarcza Thomas H.
The Boeing Company
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