Electromagnetic proximity fuse

Details Electromagnetic proximity fuse Electromagnetic proximity fuse

1983-03-25

1985-03-12

Jordan, Charles T.

Ammunition and explosives

Igniting devices and systems

Ignition or detonation circuit

F42C 1304

Patent

active

045037752

ABSTRACT:
An electromagnetic proximity fuse system operating by transmitting an electromagnetic wave and which is reflected by an object. The reflected wave is combined with the transmitted wave to produce a doppler signal, which is used to trigger an ignition circuit. The doppler signal U.sub.1 is applied to an analog divider (12) together with a delayed version of the doppler signal U.sub.2. The analog divider (12) delivers an output signal of doppler frequency (f.sub.d), the amplitude of which is equal to the quotient U.sub.1 /U.sub.2. This output signal is applied to a filter (15), which has a frequency characteristic approximately equal to 1/(f.sub.o +f), where f.sub.o is a system parameter and f is the frequency (f.sub.d). The output signal from the filter (15) is applied to an ignition circuit (17) via a threshold circuit (16) having a fixed threshold at which the ignition circuit (17) is to be triggered. The ignition circuit (17) will be triggered at a constant distance from the reflecting object independently of such unknown variables as the approaching speed, the reflection factor of the object and the gain factor of the system.

REFERENCES:
patent: 4192235 (1980-03-01), Jacomini
patent: 4205316 (1980-05-01), Peperone
patent: 4232609 (1980-11-01), Held

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