Automatic-gain rotary projectile revolution number calculating method

Abstract

The invention provides an automatic-gain rotary projectile revolution number calculating method. A revolution number calculating circuit is arranged in a projectile and comprises a magnetic electronic chip, an amplifying module, an effective value detector, a single chip microcomputer, a feedback resistance network, a window comparer and a revolution number calculating module. The feedback resistance network comprises a one-out-of-eight switch and resistors from R1 to R8. The amplifying module is used for receiving sinusoidal signals transmitted by the magnetic electronic chip in the projectile. The effective value detector is used for converting the alternating-current signals output by the amplifying module into direct-current signals. The single chip microcomputer is used for carrying out AD conversion on the direct-current signals output by the effective value detector and can gate one resistor in the feedback resistance network to participate in operation of an operational amplifier according to AD conversion results. The window comparer is used for converting the sinusoidal waves output by the amplifying module into square wave pulse. The revolution number calculating module is used for counting the number of the square waves output by the window comparer to obtain the revolution number of the projectile. The automatic-gain rotary projectile revolution number calculating method enables the amplitude of the output voltage of the operational amplifier to be basically constant.

Description

technical field [0001] The invention relates to a method for counting revolutions of a rotating projectile with automatic gain, and belongs to the technical field of non-contact fuzes such as air bomb fuzes and proximity fuzes. Background technique [0002] After the shell projectile or grenade projectile is launched, its range can be determined according to its number of revolutions. Theoretically, after the rotating projectile exits the muzzle or barrel, the flight distance of the projectile is related to the number of revolutions of the projectile, and the number of revolutions has a linear relationship with the range, but has nothing to do with the initial velocity. Therefore, the explosion point of the projectile can be determined by setting the number of revolutions of the projectile—that is, the detonation at a fixed distance can be achieved by counting the number of revolutions. [0003] Transforming the sine wave with a window comparator can output two square wave ...

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Problems solved by technology

This will cause difficulties in the processing of the back-end acquisition circuit

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