| 摘要 |
1. An improved air target fuze for use on a missile, said fuze comprising in combination: an oscillator, a modulator connected to frequency modulate said oscillator with a modulating waveform chosen so that the carrier frequency of said oscillator is changed from its initial value at approximately a t2/3 rate, where t represents time, until a predetermned frequency is reached, the wave then decreasing at a -t2/3 rate until the carrier frequency returns to its initial value, the above cycle then repeating periodically, a sidewise looking transmitting antenna to which the frequency modulated output of said oscillator is fed, a sidewise looking receiving antenna for receiving a reflected wave from a target, a mixer to which the received wave and a portion of the transmitted wave are fed, a narrow band amplifier having a center frequency fo to which the output of said mixer is fed, said modulating waveform further being chosen so that at the fuze-to-target cut-off distance beyond which the fuze is not to respond the difference frequency between the transmitted and received waves when the transmitted wave has a frequency corresponding to said predetermined point is substantially equal to the center frequency fo of said amplifier, a detonator, and means connected to the output of said narrow band amplifier for functioning said detonator in response to the receipt of a signal from said amplifier.
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