Abstract: A signal processing circuit for producing a warhead firing pulse when the rhead is in a position to cause maximum target damage in a missile, target encounter. The received doppler signal is processed through filter circuits and a first band-pass amplifier. A second band-pass amplifier tuned to pass a narrow portion of the frequency spectrum above the doppler signal is connected in parallel with the first amplifier and its output signal is used to vary the threshold bias to compensate for the presence of extremely noisy signals.

Abstract: A high altitude pulse doppler ordnance fuze which includes a plate pulsed cillator having an integrated loop antenna. A modulator coupled to the plate pulses the oscillator to provide main and secondary pulses. The main pulse produced in the oscillator is radiated to a target and the echo therefrom interacts with the secondary pulse produced in the oscillator to provide grid current variation indicative of doppler signal. Gate circuitry, including a differentiating circuit, monostable multivibrators, and a reset network, is responsive to the modulator output to gate a detector to detect the grid current variation and, therefore, obtain doppler information upon interaction of the echo and secondary pulse signals.