An anti-aerosol interference method for pulsed laser fuze based on echo feature recognition

A pulsed laser and feature recognition technology, applied in the field of laser fuze, can solve the problem that laser fuze is easily interfered by aerosol, and achieve the effect of eliminating interference and improving accuracy

Active Publication Date: 2022-07-05
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a pulsed laser fuze anti-aerosol interference method based on echo feature recognition, which can solve the problem that the laser fuze is susceptible to aerosol interference

Method used

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  • An anti-aerosol interference method for pulsed laser fuze based on echo feature recognition
  • An anti-aerosol interference method for pulsed laser fuze based on echo feature recognition
  • An anti-aerosol interference method for pulsed laser fuze based on echo feature recognition

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Experimental program
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Effect test

Embodiment 1

[0025] A pulsed laser fuze with a laser wavelength of 0.86μm detects a target at a distance of 5m, the target is a Lambertian plate with a reflectivity of 0.1, and the target plane is perpendicular to the axis of the emitted laser, such as figure 2 shown.

[0026] Step 1. Modulate the emitted laser into a narrow pulse signal: the half-height width of the pulse signal is 5ns, such as image 3 shown;

[0027] Step 2: Pulse echo signal sampling: The pulse echo signal received by the laser fuze is as follows: Figure 4 As shown, set the sampling threshold to 4E-4, set the sampling time interval to 0.5ns, sample the pulse echo signal, and save the time and echo intensity of the sampling point;

[0028] Step 3. Divide the rising edge and falling edge of the echo: the sampling point with the largest echo intensity is at the time of 40ns, with the time of 40ns as the dividing point, the echo before the time of 40ns is the rising edge, and the echo after the time of 40ns is the fall...

Embodiment 2

[0033] A pulsed laser fuze with a laser wavelength of 0.86μm detects aerosols at a distance of 5m. The aerosol is a sandy aerosol with a visibility of 50m and a particle size range of 0.1-50μm, such as Figure 5 shown.

[0034] Step 1. Modulate the emitted laser into a narrow pulse signal: the half-height width of the pulse signal is 5ns, such as image 3 shown;

[0035] Step 2: Pulse echo signal sampling: The pulse echo signal received by the laser fuze is as follows: Image 6 As shown, set the sampling threshold to 4E-4, set the sampling time interval to 0.5ns, sample the pulse echo signal, and save the time and echo intensity of the sampling point;

[0036] Step 3: Divide the rising edge and falling edge of the echo: the sampling point with the largest echo intensity is at the time of 44ns, with the time of 44ns as the dividing point, the echo before the time of 44ns is the rising edge, and the echo after the time of 44ns is the falling edge ;

[0037] Step 4. Calculate...

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Abstract

The invention discloses an anti-aerosol interference method for pulsed laser fuze based on echo feature identification, belonging to the technical field of laser fuze. The method first modulates the emitted laser into a narrow pulse signal; then samples the narrow pulse echo signal received by the laser fuze, and saves the time and echo intensity of the sampling point; then divides the rising edge and falling edge of the echo and calculates the echo signal. The duration of the rising and falling edges of the wave; finally compare the duration of the rising and falling edges to determine the source of the echo: if the duration of the falling edge exceeds 1.5 times the duration of the rising edge, the echo is considered to be from aerosol, otherwise The echoes are considered to originate from the target. The invention can solve the problem that the laser fuze is easily interfered by aerosol.

Description

technical field [0001] The invention belongs to the technical field of laser fuzes, and relates to a method for resisting aerosol interference of pulsed laser fuzes. Background technique [0002] Laser fuze is a weapon subsystem that uses laser to detect the target at a short distance, and timely controls the detonation of the ammunition according to the detected target information. Laser fuze has the advantages of strong anti-electromagnetic interference ability and high accuracy of fixed distance, but it also has the disadvantage of being easily interfered by aerosols such as smoke and clouds. When the laser fuze works in the aerosol environment, the scattering effect of the aerosol on the laser will form false target echoes, resulting in false alarms and premature explosion of the laser fuze. SUMMARY OF THE INVENTION [0003] In view of this, the present invention provides an anti-aerosol interference method for a pulsed laser fuze based on echo feature identification,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/495G01S17/88
CPCG01S7/495G01S17/88
Inventor 陈慧敏王凤杰马超刘伟博杨尚贤徐立新邓甲昊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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