F - Mech Eng,Light,Heat,Weapons – 42 – C
Patent
F - Mech Eng,Light,Heat,Weapons
42
C
343/23
F42C 13/04 (2006.01) G01S 13/50 (2006.01)
Patent
CA 1211545
12 ABSTRACT: "An electromagnetic proximity fuse". The invention relates to an electromagnetic pro- ximity fuse operating with transmission of an electro- magnetic IIF-wave and reception of a reflected wave received after reflection against an object, which reflected wave is combined with the transmitted one for generating a signal of doppler frequency (fd) or so called doppler signal, which is used to initiate an ignition circuit. According to the invention the said doppler signal is led to an analogue divider (12) together with a delayed version of the said doppler signal. The analogue divider (12) delivers an output signal of doppler frequency (fd), the amplitude of which is equal to the quotient between the prevailing value (U1) of the doppler signal and the value of the doppler signal a predetermined time interval pre- viously (U2). This quotient signal of doppler frequency is led to a filter (15), which at least approximately has a frequency characteristic equal to 1/(fo + f), where fo is a system parameter and f is the input frequency, i.e. in the present case equal to the doppler frequency (fd). The output signal from the filter (15) is finally led to an ignition circuit (17) via a threshold circuit (16) having a fixed threshold in order to initiate the ignition circuit (17), when the output signal from the filter ex- ceeds a given value. Hereby the ignition circuit (17) will be triggered at a constant distance from the reflect- ing object independently of such unknown variables as the approaching speed, the reflection factor of the object and the gain factor of the HF-system. (Fig. 1).
424980
N.v.philips'gloeilampenfabrieken
Van Steinburg C.e.
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