RU2591293C1 - Method of actuation of initiator of gas-dynamic pulse device - Google Patents

Abstract

FIELD: weapons and ammunition.

SUBSTANCE: invention can be used in proximity fuses ammunition. Method of actuation of initiator of gas-dynamic pulse device involves detection of object. Detection is carried out using a sensor responding to approach to external bodies by probing space with a series of light pulses with subsequent recording of reflected pulses. Method also includes generating a signal of actuation of initiator at recording all reflected pulses of current series. End of pulses recorded in a predetermined time interval that defines the distance to object. Probing light pulses are emitted at least one pair of differently directed radiators. Reflected signals are registered by photodetectors associated with each radiator. Every next probing pulse series formed after detecting previous reflected one. Generating a signal for actuating the initiator is indicated with recording of reflected signals of current series of one of the pairs of radiators. Duration of time interval, which characterises the error of determining distance to the object is specified taking into account the duration of the leading edge of the light pulse.

EFFECT: higher noise immunity, reduced power consumption of the device.

3 cl, 2 dwg

Description

The invention relates to methods for generating signals that drive the initiators of gas-dynamic pulsed devices based on the use of optical non-contact sensors that respond to proximity with external bodies and generate a signal without contact with them, which ensures activation at the optimum time.

One of the main tasks in this technical field is to ensure the accuracy of determining the distance to the object. When using optical non-contact sensors, special attention is paid to noise immunity, which is enhanced by the use of optical radiation with wavelengths that reduce the influence of finely dispersed media: dust, fog, rain, artificial media.

A known method of driving the initiator of a gas-dynamic pulsed device, which is based on laser sounding of space with two light beams and registration of reflected radiation by two receivers, one object is identified at a long distance, the other at a short distance, the time interval between the moments of identification is measured, the speed is estimated approaching the object, and then form a signal for activation (patent RU 2300729, publ. 10.06.2007, Bull. No. 17).

The disadvantage of this method is that there may be an error in determining the distance, since the acceleration and projection of the length of the object on the longitudinal axis of the initiator are not taken into account, in addition, the disadvantage is increased energy consumption, as well as the significant dimensions and weight of the device that implements this method.

There is another way to actuate the initiator of a gas-dynamic pulsed device, partially eliminating the disadvantages of the previous analogue (patent RU 2387949, publ. 04/27/2010, bull. No. 12), including the detection of an object by laser sounding of space with three light beams and registration of reflected radiation with three receivers, at the same time, they enable the formation of a delay in use, taking into account the speed and acceleration of approaching the object, as well as the projection of the length of the object on the longitudinal axis of the initiator.

The disadvantage of this method is the significant energy consumption of the device, which provides the formation of a signal for activating the initiator at an optimal distance, as well as the significant dimensions and weight of the specified device.

There is another method of actuating the initiator of a gas-dynamic pulse device (patent RU 2442956, publ. 02.20.2012, bull. No. 5), which is the closest analogue. The method is based on the detection of an object by sensing space with light pulses and registering the reflected radiation with a receiver, followed by analysis of the recorded signals, the radiation of the probe light pulses being carried out by one emitter, and the registration of reflected radiation by one receiver, the registration being carried out in a test time window that opens through time interval determining the distance at which the initiator must be activated, counted from the moment of teachings of the light pulse, and the duration of the test time window sets the error in determining the distance, while the activating pulse is formed after the registration of radiation. To exclude activation from random interference, an established series of light pulses is emitted, in the case of registration of the reflected signals of all emitted light pulses of the current series and subject to registration of the final reflected signal of the series in the test time window, an activating pulse is generated. Object detection at two distances: far and near, is carried out by one emitter and one receiver, while the speed of approach to the object is estimated by the value of the time interval between them and a time delay of initiator activation is formed depending on its speed.

This method allows to reduce the power consumption of the device, compared with the previous analogue, however, the power consumption remains significant, in addition, protection against random small interference is not sufficiently provided.

The technical result of the claimed invention is to increase noise immunity. An additional technical result is the reduction of energy consumption.

The specified technical result is achieved due to the fact that in the method of driving the initiator of a gas-dynamic pulsed device, which includes detecting an object using a sensor that responds to proximity with external bodies, by sensing the space with a series of light pulses with subsequent registration of reflected pulses and generating an initiator activation signal when registration of all reflected pulses of the current series, the final of which is recorded in a predetermined time interval, determining the distance to the object, it is new that probing light pulses emit at least one pair of oppositely directed emitters, and the reflected signals are recorded by a photodetector corresponding to each emitter, while each subsequent probe pulse of the series is formed after registering the reflected previous one, the formation of the initiator activation signal produce only when registering the reflected signals of the current series of one of a pair of emitters, and the duration of the time interval Characterizing the error in determining the distance to the object set with the duration of the leading edge of the light pulse.

Besides:

After registering the reflected signal of the first of the probe pulses of the current series, the pulse repetition rate is increased by an order of magnitude.

In the absence of one reflected pulse from the current series, the probe pulses cease and begin the series again.

The use of at least one pair of oppositely directed emitters and registration of the reflected signals with a photodetector corresponding to each emitter increases the probability of detecting an object and allows for an operation algorithm that excludes interference from random interference, since when registering all the reflected signals with two receivers, a signal for activation is not formed.

The algorithm for the formation of each subsequent pulse of the series after registering the reflected previous increases the probability of detecting the object and eliminates the use of random interference, because in the absence of registration of the reflected pulse, the probe pulses are stopped and the series starts again. The termination of the formation of probe pulses in the absence of one reflected pulse from the current series and the beginning of the series again provides noise immunity.

The formation of a detonation pulse only when registering all the reflected signals of the current series of one of a pair of emitters also increases the noise immunity.

The duration of the time interval characterizing the error in determining the distance of detonation is set taking into account the duration of the leading edge of the light pulse, which increases the noise immunity when detecting a target and generating a triggering pulse.

Scanning the space with light pulses on the trajectory before detecting an object with a frequency an order of magnitude lower than after its detection, reduces energy consumption.

The invention is illustrated in FIG. 1 and 2.

In FIG. 1 shows graphs of pulses at which an actuating signal is generated, and in FIG. 2 - refusal to activate, where

LZI1 and LZI2 - laser probe pulses of a pair of emitters;

SFP1 and SFP2 - registered reflected light pulses from photodetectors;

IVI - the impulse of the time interval;

ZI - activating impulse.

The proposed method for driving the initiator of a gas-dynamic pulsed device at an optimal distance from the object is implemented as follows. The space is probed by light pulses with a frequency f, which form a pair of emitters (infrared semiconductor lasers) operating synchronously. The probe light pulses LZI1 and LZI2 have a given duration and, in the object detection mode, emit a series of pulses with an increased frequency (in a series of 8 pulses, frequency f * 10). Each subsequent probe pulse of the series is formed after registration of the reflected previous one. The reflected signals TFP1 and TFP2 are registered by a photodetector corresponding to each emitter. After registering the reflected signal, the first of the probe pulses of the current series, for example, a series of LZI1 corresponding photodetector, the pulse repetition rate is increased by an order of magnitude (shown in Fig. 1). In the absence of one reflected pulse from the current series, for example, LZI2 (Fig. 1), the probe pulses are stopped and, if the LZI1 series does not form a ZI command, the series starts again.

The driving pulse ZI is formed only when all the reflected signals of the current series of one of the pair of emitters are registered, and the duration of the time interval t1, which characterizes the error in determining the distance ± 0.5 m, is set taking into account the duration of the leading edge of the light pulse. In FIG. Figure 1 shows the variant when all pulses of the LZI1 series are registered by the corresponding photodetector SFP1, and not all pulses of the LZI2 series are registered.

In FIG. Figure 2 shows the variant when, in the event of interference, all pulses of the LZI1 and LZI2 series are detected by the corresponding photodetectors SFP1 and SFP2, which excluded the formation of a ZI pulse.

Thus, the inventive method provides noise immunity, accuracy of determining the distance of ± 0.5 m and reducing energy consumption when sensing the space to detect the object.

Claims (3)

1. A method of driving an initiator of a gas-dynamic pulsed device, including detecting an object using a sensor that responds to proximity with external bodies, by sensing the space with a series of light pulses followed by registration of reflected pulses and generating an initiator activation signal when registering all reflected pulses of the current series, the final of which register in a predetermined time interval that determines the distance to the object, characterized in that the probes The light pulses emit at least one pair of oppositely directed emitters, and the reflected signals are recorded by a photodetector corresponding to each emitter, and each subsequent probe pulse of the series is generated after the reflection of the previous one is recorded, the initiator activation signal is generated only when the reflected signals of the current series of one of pairs of emitters, and the duration of the time interval characterizing the error in determining the distance to the object , set taking into account the duration of the leading edge of the light pulse. 2. The method according to p. 1, characterized in that after registering the reflected signal of the first of the probe pulses of the current series, the pulse repetition rate is increased by an order of magnitude. 3. The method according to p. 1, characterized in that in the absence of one reflected pulse from the current series, the probe pulses are stopped and the series starts again.

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