초록 ▼

Disclosed is a Doppler tracking processor and time of closest approach detector for use in active or semi-active radar-guided missiles. A known processor uses a fractional Doppler gate (FDG) to process the Doppler signal to activate the warhead detonation properly at time of closest approach (TCA);

Disclosed is a Doppler tracking processor and time of closest approach detector for use in active or semi-active radar-guided missiles. A known processor uses a fractional Doppler gate (FDG) to process the Doppler signal to activate the warhead detonation properly at time of closest approach (TCA); it indicates when the Doppler energy has rolled off to, for example, one-half the pre-intercept Doppler frequency. The present invention uses a Doppler tracking processor and TCA detector. The tracking filter can extract the instantaneous value of the Doppler frequency even during roll-off. The system processes the Doppler from the pre-intercept frequency up to an appropriate fractional frequency occurring at TCA, at which time it provides a signal for use in warhead detonation.

대표청구항 ▼

A Doppler tracking processor and time of closest approach detector system comprising: first means for deriving a reference signal proportional to a predetermined fraction of the frequency of a Doppler signal, said first means comprising a fractional ratio converter having an input to receive a volta

A Doppler tracking processor and time of closest approach detector system comprising: first means for deriving a reference signal proportional to a predetermined fraction of the frequency of a Doppler signal, said first means comprising a fractional ratio converter having an input to receive a voltage proportional to the Doppler signal, said converter having filtering and attenuation means for deriving said reference signal from said voltage; second means for deriving a second signal which is dynamic and is proportional to the instantaneous Doppler frequency of the Doppler signal during Doppler roll-off; and comparator means for comparing said second signal and said reference signal, said comparator producing an output signal if said second signal drops below said reference signal.