阅读说明：本技术 一种通/断靶自适应识别的触发电路 (Trigger circuit for adaptive identification of on/off target ) 是由 王代华 宋林丽 刘彬 马竹新 于 2021-08-11 设计创作，主要内容包括：本发明公开了一种通/断靶自适应识别的触发电路,所述触发电路应用于网靶测速系统,所述触发电路包括光耦合器、第一触发器、第二触发器、双路与门、或门,所述光耦合器的输入端与网靶测速系统的网靶输出端连接,光耦合器的输出端分别与第一触发器及第二触发器的输入端连接,所述第一触发器的两个复位信号端与第二触发器的时钟端连接,所述双路与门的每个与门的输入端分别连接第一触发器和第二触发器的一个输出端,所述双路与门的两个输出端分别与或门的输入端连接,或门的输出端输出触发信号。本发明的触发电路在通靶或者断靶情况下均能输出脉冲信号,实现电路的自适应通/断靶触发,解决了后续信号处理电路对于通/断靶的适配问题。(The invention discloses a trigger circuit for on/off target self-adaptive identification, which is applied to a net target speed measuring system and comprises an optical coupler, a first trigger, a second trigger, a two-way AND gate and an OR gate, wherein the input end of the optical coupler is connected with the net target output end of the net target speed measuring system, the output end of the optical coupler is respectively connected with the input ends of the first trigger and the second trigger, two reset signal ends of the first trigger are connected with the clock end of the second trigger, the input end of each AND gate of the two-way AND gate is respectively connected with one output end of the first trigger and one output end of the second trigger, the two output ends of the two-way AND gate are respectively connected with the input end of the OR gate, and the output end of the OR gate outputs a trigger signal. The trigger circuit of the invention can output pulse signals under the condition of target on or target off, realizes the self-adaptive on/off target triggering of the circuit, and solves the problem of adaptation of a subsequent signal processing circuit to the on/off target.)

1. The trigger circuit is characterized in that the trigger circuit is applied to a net target speed measuring system, the trigger circuit comprises an optical coupler, a first trigger, a second trigger, a two-way AND gate and an OR gate, the input end of the optical coupler is connected with the net target output end of the net target speed measuring system, the output end of the optical coupler is respectively connected with the input ends of the first trigger and the second trigger, two reset signal ends of the first trigger are connected with the clock end of the second trigger, the input end of each AND gate of the two-way AND gate is respectively connected with one output end of the first trigger and one output end of the second trigger, two output ends of the two-way AND gate are respectively connected with the input end of the OR gate, and the output end of the OR gate outputs a trigger signal.

2. The trigger circuit for on/off target adaptive identification according to claim 1, wherein the mesh targets in the mesh target speed measurement system comprise on targets and off targets.

3. The on/off target adaptive identification trigger circuit of claim 1, wherein the optical coupler is a high speed logic gate optical coupler.

4. The on/off target adaptive identification trigger circuit according to claim 1, wherein the first trigger is a monostable trigger.

5. The on/off target adaptive identification trigger circuit according to claim 1, wherein the second trigger is a D trigger.

Technical Field

The invention relates to a trigger circuit technology, in particular to a trigger circuit for on/off target self-adaptive identification.

Background

An important content in the processes of weapon development and artillery firing schedule compilation is the measurement of the flight speed of the projectile. The measurement of the projectile velocity can well reflect the accuracy and the destructiveness of the weapon and whether the basic condition of the weapon is normal. Accurate projectile velocity measurement can monitor and predict the trajectory, so that the hit rate of the projectile is greatly improved. Meanwhile, the speed of the projectile is also one of the main parameters for measuring the overall performance of the powder charge, the projectile and the artillery weapon system and the artillery damage. Among the testing means of the initial speed and the fragment speed of the projectile at the muzzle, the net target method is a mature means. The net target is divided into an open target and a broken target according to different principles. Generally speaking, a common target is easier to manufacture than a broken target, but can be triggered only once, and is often used for the requirement of measuring the speed of a projectile; the broken target can be triggered for multiple times according to different target spots, and is more suitable for the occasions of fragment speed measurement.

The main defect of the conventional net target speed measuring method is that different subsequent adaptation circuits need to be designed aiming at the two net targets, and the net targets cannot be interchanged and used universally.

Therefore, it is necessary to design a trigger circuit for on/off target adaptive identification.

Disclosure of Invention

In order to solve the defects of the prior art, the invention provides the trigger circuit for the on/off target self-adaptive identification, which can realize the on/off target self-adaptive identification trigger function in the net target speed measurement.

The invention is realized by adopting the following technical scheme:

the trigger circuit comprises an optical coupler, a first trigger, a second trigger, a two-way AND gate and an OR gate, wherein the input end of the optical coupler is connected with the net target output end of the net target speed measuring system, the output end of the optical coupler is respectively connected with the input ends of the first trigger and the second trigger, two reset signal ends of the first trigger are connected with the clock end of the second trigger, the input end of each AND gate of the two-way AND gate is respectively connected with one output end of the first trigger and one output end of the second trigger, two output ends of the two-way AND gate are respectively connected with the input end of the OR gate, and the output end of the OR gate outputs a trigger signal. In the invention, the optical coupler is used for converting the state of the target line into a corresponding edge signal; the first trigger is used for outputting a pulse signal according to the edge signal of the optical coupler; the second trigger is used for latching an initial state formed by power-on reset; the two-way AND gate is used for shielding the invalid signal; or gates are used to generate unique output signals.

Furthermore, the net target in the net target speed measuring system comprises an on target and an off target.

Further, the optical coupler is a high-speed logic gate optical coupler.

Further, the first flip-flop is a monostable flip-flop.

Further, the second flip-flop is a D flip-flop.

Compared with the prior art, the invention has the following beneficial effects:

the trigger circuit for on/off target self-adaptive identification provided by the invention has the advantages that the optical coupler can transmit a net target line signal to the first trigger, the first trigger and the second trigger output a non-effective signal which is shielded by the double-path AND gate, and the single output of the signal is realized by the OR gate, so that the problem of the adaptation of a subsequent signal processing circuit to on/off targets is solved, namely, pulse signals can be output under the condition of on or off targets, and the self-adaptive on/off target triggering of the circuit is realized.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of a trigger circuit according to the present invention.

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

1-2, a trigger circuit for adaptive identification of on/off targets, wherein the trigger circuit is applied in a net target speed measurement system, and the trigger circuit comprises an optical couplerThe input end of the optical coupler U1 is connected with the net target output end of the net target speed measuring system, and the output end of the optical coupler U1 is respectively connected with 1B of the first trigger U2 and the output end of the optical coupler U1Terminals D of a second flip-flop U3, two of the first flip-flops U2The signal end is connected with a clock end CLK of a second flip-flop U3, two output ends 1Q and 2Q of the first flip-flop U2 are respectively connected with the 1B end and the 2A end of a two-way AND gate U4, and two output ends Q and 2A of the second flip-flop U3The two output ends 1Y and 2Y of the two-way AND gate U4 are respectively connected with the input ends A and B of the OR gate U5, and the output end Y of the OR gate U5 outputs a trigger signal.

The net target in the net target speed measuring system comprises an on target and an off target.

The optical coupler U1 is a high-speed logic gate optical coupler, and specifically selects an HCPL-2601 chip, the first trigger U2 is a monostable trigger, specifically selects a 74HC123 chip, the second trigger U3 is a D trigger, specifically selects a CD4013 chip, the two-way AND gate U4 specifically selects an SN74LVC2G08 chip, or the gate U5 specifically selects an SN74HC1G32 chip.

The working principle of the trigger circuit of the invention is as follows:

when the net target connected with the trigger circuit is a through target, the optical coupler U1 outputs low level, the Q pin of the second trigger U3 is low level,outputting a high level; when the projectile passes through the target, the optical coupler U1 correspondingly has rising edge output, the 1Q output pulse of the first trigger U2 and the 2Q output are not output, and the 1Q and the 2Q of the first trigger U2 are subjected to double-circuit connection andof doors U4 with second flip-flops U3, respectivelyThe phase Q is AND, 1Y of the two-way AND gate U4 outputs a pulse signal, and 2Y does not output;

when the net target connected with the trigger circuit is an open target, the optocoupler U1 outputs high level, the Q pin of the second trigger U3 is high level,outputting a low level; when the projectile passes through the target, the optical coupler U1 correspondingly has a falling edge output, 2Q of the first trigger U2 outputs a pulse, 1Q has no output, and 1Q and 2Q of the first trigger U2 are respectively connected with that of the second trigger U3 through a double-way AND gateThe phase Q is AND, 2Y of the two-way AND gate U4 outputs a pulse signal, and 1Y does not output;

the 1Y and 2Y of the two-way AND gate U4 are output through an OR gate U5, and single output of a trigger circuit, namely self-adaptive on/off target triggering, is realized.

The above embodiments are not limited to the technical solutions of the embodiments themselves, and the embodiments may be combined with each other into a new embodiment. The above embodiments are only for illustrating the technical solutions of the present invention and are not limited thereto, and any modification or equivalent replacement without departing from the spirit and scope of the present invention should be covered within the technical solutions of the present invention.