A device and method for measuring the target coordinates of a large-target supersonic projectile

Abstract

The present invention discloses a device for measuring the coordinates of a supersonic projectile hitting a target with a large target surface and a measuring method thereof. The coordinate measuring device comprises a dual-path laser light source, a laser receiving device and a projectile signal acquisition and processing device. The dual-path laser light source is respectively located above, to the right, below and to the left of the measuring target surface. The dual-path laser light source comprises a main light and a side light. The laser receiving device is respectively located at the four corners of the measuring target surface. The laser receiving device is used to receive the light emitted by the dual-path laser light source and output a projectile simulation signal. The projectile signal acquisition and processing device is used to collect and process the four-path projectile simulation signals output by four laser receiving devices. Measuring method: After processing the projectile simulation signal, a time value is obtained, and the projectile hitting the target coordinates are calculated according to the time value and the distance of the laser light. The advantages of the present invention are: a simple measuring principle, a large coverage range of the measuring target surface, and high measuring accuracy, and it can be used for measuring the hitting coordinates of target surfaces of various sizes.

Description

Technical Field

[0001] The invention relates to the technical field of shooting range trajectory parameter testing, and in particular to a device and a method for measuring the target coordinates of a large-target supersonic projectile based on the principle of laser sensing projectile shock waves. Background Art

[0002] In the inspection of guns (cannons), bullets and propellants at the weapons shooting range, the dispersion parameters such as the projectile target coordinates and the density of the vertical targets are key indicators for assessing the important performance of the weapon system aiming, the consistency of the ammunition launch, etc. For the measurement of indoor projectile target coordinates, the commonly used methods are: target plate method, acoustic method, mesh light curtain coordinate measurement method, multi-light curtain intersection method, and dual-line array CCD camera intersection method.

[0003] The target plate method is to erect a wooden board or gauze at the position specified in the trajectory according to the test regulations. After a group of shooting is completed, the position of the bullet holes on the target plate is measured manually. Although the target plate method is highly reliable, it consumes a lot of materials, the target plate with a large target surface is inconvenient to install, and it cannot identify duplicate holes. It is time-consuming and labor-intensive. Not only can it not achieve real-time data processing, but also due to manual measurement, the human error is large.

[0004] The acoustic target uses an array of acoustic sensors to receive shock wave information generated by supersonic projectiles. The projectile impact coordinates can be calculated by using the multi-point positioning method based on the order and time difference of the projectile shock wave hitting each acoustic sensor. The advantage of the acoustic target is that it is not affected by external light and does not require a light source, but its disadvantage is that compared with other projectile impact coordinate measurement methods, the acoustic target measurement error is larger.

[0005] The grid light curtain coordinate measurement method uses multiple light-emitting device arrays and corresponding semiconductor receiving device arrays to form a grid light curtain. When the projectile hits the target, the corresponding light is blocked to form an on-off signal of the light. The corresponding receiving device receives the signal and finally obtains the target coordinates after real-time processing. This test method requires more light-emitting devices, photoelectric detection devices and corresponding signal processing circuits, so the system is more complex and has a high failure rate. The system also requires a sturdy and bulky target stand, which is inconvenient to install. After a long period of use, the target stand is easily deformed, which eventually leads to problems such as low sensitivity of the system.

[0006] The multi-light curtain intersection target used indoors includes the four-light curtain intersection target, the six-light curtain intersection target, the seven-light curtain intersection target, etc. The four-light curtain intersection target is to arrange four light curtains formed by light curtain targets or sky curtain targets in space at specific positions and angles. When the projectile passes through the light curtain, the time value of the projectile passing through the four light curtains is recorded by a time meter or a data acquisition instrument. The position coordinates of the projectile passing through the light curtain can be calculated based on the four time values ​​and the spatial position parameters of the light curtain. The four-light curtain intersection target requires the projectile to be incident vertically on the predetermined target surface. When it is not vertical, the coordinate value calculated by the coordinate calculation formula used is greatly different from the actual value. The six-light curtain intersection target is based on the four-light curtain intersection target. By adding two light curtain surfaces, it can measure multiple parameters of the oblique incident projectile velocity, the spatial angle of the velocity direction and the target position coordinates. This system successfully solves the problem of inaccurate measurement of the four-light curtain intersection target for the oblique incident trajectory target coordinates and velocity. However, when the multi-light curtain measurement method is used for indoor projectile target coordinate measurement, each detection light curtain needs to be equipped with a stable background light source, which makes the system more complex and bulky, and it is not easy to form a larger measurement target surface. The size of the general indoor multi-light curtain intersection target surface is only between 1m×1m and 1.5m×1.5m.

[0007] The dual-line array CCD intersection target uses the detection light screens of two high-speed line array CCD cameras to intersect in the same plane in space to form a target surface for measuring the projectile's target coordinates. When the projectile passes through the measurement target surface, it is imaged on the corresponding CCD detection device through the lenses of the two cameras. The system can determine the two straight lines corresponding to the projectile's target coordinates based on the center position of the projectile image, the focal length of the lens, and the distance between the two cameras. The intersection of the two straight lines can calculate the projectile's target coordinates. Its advantages are: simple structure, easy to use, and high measurement accuracy; but its disadvantages are: when the system is used for indoor measurement, it is necessary to equip the two cameras with a long strip light source with stable light emission. When a larger target surface needs to be formed, the complexity of the light source will increase. Summary of the invention

[0008] In view of the defects of the prior art, the present invention provides a device and method for measuring the impact coordinates of a large-target supersonic projectile. The measuring device has a simple structure and is applicable to supersonic projectiles of various materials. The target size can cover various sizes of existing indoor target tracks ranging from 1m×1m to 10m×10m. The device of the present invention is installed on a target stand and is also applicable to measuring the impact coordinates of projectiles of various target sizes outdoors.

[0009] In order to achieve the above invention object, the technical solution adopted by the present invention is as follows:

[0010] A device for measuring the target coordinates of a large-target supersonic projectile comprises four dual-light-path laser light sources, four laser receiving devices and a projectile signal acquisition and processing device.

[0011] The four dual-path laser light sources are respectively located above, below, left and right of the measurement target surface. Each dual-path laser light source includes two parallel light rays, a main light ray and a side light ray. The light emitted by the laser forms a rectangular frame inside the measurement target surface. The four light rays emitted by the upper and lower dual-path laser light sources are parallel to each other, and the four light rays emitted by the left and right dual-path laser light sources are parallel to each other.

[0012] Four laser receiving devices are located at the four corners of the measuring target surface, respectively, for receiving the light emitted by the dual-path laser light source and outputting four-path projectile simulation signals.

[0013] The projectile signal acquisition and processing device is used to collect four-channel projectile simulation signals output by four laser receiving devices, process the four-channel projectile simulation signals, obtain eight time values ​​when the projectile shock wave sound signal reaches eight laser lights in the upper, lower, left and right directions, and calculate the projectile target coordinates based on the eight time values ​​and the distance value between the main light and the side light generated by the dual-path laser light source; the four laser receiving devices and the projectile signal acquisition and processing device are connected by a signal transmission cable.

[0014] Furthermore, the laser is a red light point laser with a wavelength of 650nm.

[0015] Furthermore, each of the dual-path laser light sources includes: a point laser, a front-end semi-transparent and semi-reflective mirror, a front-end reflective mirror, a main light, a side light, a rear-end reflective mirror, and a rear-end semi-transparent and semi-reflective mirror; the light emitted by the point laser first passes through the front-end semi-transparent and semi-reflective mirror, the transmitted light is the main light, and the reflected light is then reflected by the front-end reflective mirror to become the side light, and the side light and the main light are parallel to each other; the main light propagates forward in a straight line, and then after passing through the rear-end semi-transparent and semi-reflective mirror, the transmitted light is received by the laser receiving device; the side light is reflected by the rear-end reflective mirror, and then reflected by the rear-end semi-transparent and semi-reflective mirror to be received by the laser receiving device.

[0016] Furthermore, each of the laser receiving devices comprises: a narrowband filter, an aperture piece at the front end of the lens, a focusing lens, an aperture piece at the rear end of the lens, a photoelectric detection device and a signal processing circuit board; the light emitted by the dual-path laser light source passes through the narrowband filter, the aperture piece at the front end of the lens, the focusing lens and the aperture piece at the rear end of the lens in sequence and is finally received by the photoelectric detection device. When the supersonic projectile passes through the measurement target surface, the conical projectile shock wave acoustic signal generated by the projectile reaches the edge of the measurement target surface in sequence and compresses the air that propagates the laser light, thereby causing the laser light to jitter, and finally causing the light reaching the photoelectric detection device to change rapidly. The photoelectric detection device converts the rapidly changing optical signal into a changing weak current signal, and the signal processing circuit board performs current-to-voltage conversion, signal amplification and filtering on the current signal. Finally, the four laser receiving devices output four projectile simulation signals, and each projectile simulation signal contains two projectile shock wave electrical signals corresponding to the moment when the projectile shock wave acoustic signal hits the main light and the side light.

[0017] The present invention also discloses a method for measuring the target coordinates of a large-target supersonic projectile, comprising: processing four-channel projectile simulation signals, calculating the time values ​​of eight projectile shock wave electrical signals in the four-channel projectile simulation signals, and finally solving the projectile target coordinates according to the projectile target coordinate calculation model of the measuring device.

[0018] Furthermore, the method for measuring the target coordinates of a large target surface supersonic projectile is specifically implemented by the following steps:

[0019] Step 1: Take the center line of the main light corresponding to the two dual-path laser light sources on the top and bottom as the X-axis, take the center line of the main light corresponding to the two dual-path laser light sources on the left and right as the Y-axis, establish a plane rectangular coordinate system XOY, the plane corresponding to the coordinate system XOY is the measurement target surface, and set the distance between the main light corresponding to the two dual-path laser light sources on the left and right as S X , let S be the distance between the main rays corresponding to the two dual-path laser light sources above and below Y , let the distance between the main light and the side light inside each dual-path laser light source be D, let the propagation speed of the shock wave in the measurement target surface be V, let the target coordinates of the projectile be (X, Y);

[0020] Step 2, live ammunition shooting, when the projectile passes through the predetermined measurement target surface, the shock wave sound signal generated by the supersonic projectile reaches the eight main rays and side rays emitted by the four dual-path laser light sources in sequence, and causes the light reaching the four laser receiving devices to change instantly, and the four laser receiving devices output four-path projectile simulation signals;

[0021] Step 3: The projectile signal acquisition and processing device acquires four projectile simulation signals output by four laser receiving devices and processes the four projectile simulation signals; obtains the time T when the projectile shock wave acoustic signal reaches the main light and side light of the left dual-path laser light source X左主 and T X左侧 , the time when the main light and the side light of the dual-path laser light source on the right side arrive at T X右主 and T X右侧 , the time when the main light and the side light of the dual-path laser light source on the upper side arrive at T Y上主 and T Y上侧 , the time when the main light and the side light of the dual-path laser light source on the lower side arrive at T Y下主 and T Y下侧 The time difference between the projectile shock wave sound signal reaching the main light of the right and left dual-path laser light sources is calculated to be ΔT X主 =T X右主 -T X左主 The time difference between the projectile shock wave sound signal reaching the main light of the upper and lower dual-path laser light sources is calculated to be ΔT Y主 =T Y上主 -T Y下主 ; The propagation velocity V of the shock wave in the measurement target surface is calculated as:

[0022]

[0023] Step 4: On the target surface, the distance between the impact point and the main light of the right dual-path laser light source is: The distance between the impact point and the main light of the left dual-path laser light source is: The distance between the impact point and the main light of the dual-path laser light source above is: The distance between the impact point and the main light of the dual-path laser light source below is: According to the propagation characteristics of the projectile shock wave, taking the impact of the projectile on the target surface as the starting time reference, the time for the shock wave to reach the main light of the dual-path laser light source on the right side of the target surface is: The time it takes for the shock wave to reach the main light of the dual-path laser light source on the left side of the target surface is: The time it takes for the shock wave to reach the main light of the dual-path laser light source above the target surface is: The time it takes for the shock wave to reach the main light of the dual-path laser light source below the target surface is:

[0024] Step 5, so we have: Further solve to get the projectile target coordinates:

[0025] in:

[0026] ΔT X主 =T X右主 -TX左主 , ΔT Y主 =T Y上主 -T Y下主 ;

[0027] Finally, the projectile impact coordinates (X, Y) are obtained.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] The invention has a wide range of applications and can be used to measure the projectile impact coordinates of flying targets such as supersonic projectiles and fragments made of various materials. Since it has its own laser light source, it can be used both indoors and outdoors.

[0030] Since the light energy of the point laser used in the device of the present invention can be transmitted over a long distance with almost no loss, the distance between the point laser and the laser receiving device can be set to 1m to 10m, or even farther. The present invention is applicable to the measurement needs of projectile target coordinates of various existing target surface sizes, and the measurement target surface covers the commonly used 1m×1m to 10m×10m, or even larger target surfaces.

[0031] Compared with the existing acoustic targets, the present invention has higher measurement accuracy because it adopts the laser positioning technology based on optical principles; compared with several commonly used coordinate measurement methods such as the mesh light curtain coordinate measurement method, the multi-light curtain intersection method, and the double-line array CCD camera intersection method, the device and the measurement method of the present invention have the advantages of simple system, simple measurement principle, simple measurement device, simple measurement mathematical model, large measurement target surface coverage, and low measurement cost.

[0032] Since the present invention adopts three anti-stray light interference measures of narrow-band filter, slit aperture and optical lens, the system has a strong ability to resist the interference of muzzle flash, and overcomes the disadvantage of being afraid of muzzle flash interference in other photoelectric principle projectile target coordinate measurement equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of a measuring device according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of a dual-light path laser light source of the device of the present invention;

[0035] Figure 3 This is a schematic diagram of the structure of the laser receiving device of the device of the present invention;

[0036] Figure 4 It is a schematic diagram of the projectile target coordinate calculation method of the present invention.

[0037] In the figure: 1. Upper dual-path laser light source, 2. Right dual-path laser light source, 3. Lower dual-path laser light source, 4. Left dual-path laser light source, 5. Upper right laser receiving device, 6. Lower right laser receiving device, 7. Lower left laser receiving device, 8. Upper left laser receiving device, 9. Projectile signal acquisition and processing device, 10. Point laser, 11. Front semi-transparent and semi-reflective mirror, 12. Front reflector, 13. Main light, 14. Side light, 15. Rear reflector, 16. Rear semi-transparent and semi-reflective mirror, 17. Narrow-band filter, 18. Front aperture of lens, 19. Focusing lens, 20. Rear aperture of lens, 21. Photoelectric detection device, 22. Signal processing circuit board, 23. Impact point. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.

[0039] The embodiment of the present invention provides a device for measuring the target coordinates of a large-target supersonic projectile, comprising four dual-light-path laser light sources, four laser receiving devices and a projectile signal acquisition and processing device.

[0040] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 The four dual-path laser light sources are: the upper dual-path laser light source 1, the right dual-path laser light source 2, the lower dual-path laser light source 3, and the left dual-path laser light source 4; the four dual-path laser light sources are respectively located above, to the right, below and to the left of the measurement target surface, each dual-path laser light source includes two parallel light rays, namely the main light 13 and the side light 14, the light emitted by the laser forms a rectangular frame inside the measurement target surface, the four light rays emitted by the upper dual-path laser light source 1 and the lower dual-path laser light source 3 are parallel to each other, and the four light rays emitted by the left dual-path laser light source 4 and the right dual-path laser light source 2 are parallel to each other.

[0041] The four laser receiving devices are: upper right laser receiving device 5, lower right laser receiving device 6, lower left laser receiving device 7, and upper left laser receiving device 8; the laser receiving devices are respectively located at the upper right corner, lower right corner, lower left corner, and upper left corner of the measurement target surface, and are respectively used to receive light emitted by the upper dual-path laser light source 1, the right dual-path laser light source 2, the lower dual-path laser light source 3, and the left dual-path laser light source 4. Finally, the four laser receiving devices output four-path projectile simulation signals.

[0042] The projectile signal acquisition and processing device 9 is used to collect four projectile simulation signals output by four laser receiving devices, process the four projectile simulation signals, obtain eight time values ​​when the projectile shock wave sound signal reaches eight laser lights in the upper, lower, left and right directions, and calculate the projectile target coordinates based on the eight time values ​​and the distance value D between the main light 13 and the side light 14 generated by the dual-path laser light source; the four laser receiving devices and the projectile signal acquisition and processing device 9 are connected by a signal transmission cable.

[0043] See also Figure 2 The four dual-path laser light sources respectively include: a point laser 10, a front semi-transparent and semi-reflective mirror 11, a front reflector 12, a main light 13, a side light 14, a rear reflector 15, and a rear semi-transparent and semi-reflective mirror 16; the point laser 10 is a red light point laser with a wavelength of 650nm, and the light emitted by the point laser 10 first passes through the front semi-transparent and semi-reflective mirror 11, and the transmitted light is the main light 13, and the reflected light is then reflected by the front reflector 12 to become the side light 14, and the main light 13 and the side light 14 are parallel to each other; the main light 13 propagates forward in a straight line, and then passes through the rear semi-transparent and semi-reflective mirror 16, and the transmitted light is received by the laser receiving device; the side light 14 is reflected by the rear reflector 15, and then reflected by the rear semi-transparent and semi-reflective mirror 16 to be received by the laser receiving device.

[0044] See also Figure 3 The four laser receiving devices respectively include a narrow-band filter 17, an aperture piece 18 at the front end of the lens, a focusing lens 19, an aperture piece 20 at the rear end of the lens, a photoelectric detection device 21, and a signal processing circuit board 22. The light projected onto the laser receiving device passes through the narrowband filter 17, the aperture 18 at the front end of the lens, the focusing lens 19, the aperture 20 at the rear end of the lens in sequence and is finally received by the photoelectric detection device 21. When the supersonic projectile passes through the measurement target surface, the conical projectile shock wave sound signal generated by the projectile reaches the edge of the measurement target surface in sequence, and compresses the air at the corresponding spatial position of the propagating laser light. Due to the local change in air density, the direction of the laser light changes instantaneously, and then the laser light jitters, and finally the light energy reaching the photoelectric detection device 21 changes instantaneously. The photoelectric detection device 21 converts the changing light signal into a changing weak current signal, and the signal processing circuit board 22 performs current-to-voltage conversion, signal amplification and filtering on the current signal, and finally outputs four projectile simulation signals, each of which contains two projectile shock wave electrical signals corresponding to the moment when the projectile shock wave sound signal hits the main light 13 and the side light 14.

[0045] See also Figure 3The central passing wavelength of the narrow band filter 17 is 650nm. The narrow band filter only allows the light with a corresponding wavelength of 650nm to pass through, and the light of other wavelengths is cut off. The front aperture piece 18 of the lens is a metal piece with a central circular hole, and the diameter of the circular hole is 10mm. The front aperture piece 18 of the lens is used to allow only the light at the central hole position to pass through, and the rest of the stray light is blocked to reduce the interference of the system stray light. The focusing lens 19 is a convex lens with a focal length of 100 mm, and the aperture piece 20 at the rear end of the lens is a metal sheet with a central circular hole with a diameter of 2 mm. The function of the focusing lens 19 is to converge the light projected onto the lens by the dual-path laser light source, and pass through the central hole of the aperture piece 20 at the rear end of the lens, and finally project onto the photoelectric detection device 21. At the same time, the focusing lens 19 and the central hole of the aperture piece 20 at the rear end of the lens form a restricted field of view with a cone angle of 1.1° in space. Light outside the 1.1° restricted field of view cannot pass through the central hole of the aperture piece 20 at the rear end of the lens, so it cannot reach the photoelectric detection device 21. Therefore, the focusing lens 19 and the aperture piece 20 at the rear end of the lens jointly play the role of removing stray light outside the 1.1° restricted field of view, thereby improving the system's ability to resist interference from muzzle flash and stray light.

[0046] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 A method for measuring the target coordinates of a large-target supersonic projectile is as follows: the projectile signal acquisition and processing device 9 processes four-way projectile analog signals, calculates the time values ​​of eight projectile shock wave electrical signals, and finally solves the projectile target coordinates according to the projectile target coordinate calculation model of the measuring device.

[0047] A method for measuring the target coordinates of a large target surface supersonic projectile is specifically implemented by the following steps:

[0048] Step 1: Take the center line of the main light 13 corresponding to the upper dual-path laser light source 1 and the lower dual-path laser light source 3 as the X-axis, take the center line of the main light 13 corresponding to the left dual-path laser light source 4 and the right dual-path laser light source 2 as the Y-axis, establish a plane rectangular coordinate system XOY, the plane corresponding to the coordinate system XOY is the measurement target surface, and set the distance between the main light 13 corresponding to the left dual-path laser light source 4 and the right dual-path laser light source 2 as S X , assuming that the distance between the main light beams 13 corresponding to the upper dual-path laser light source 1 and the lower dual-path laser light source 3 is S Y , let the distance between the main light 13 and the side light 14 inside each dual-path laser light source be D, let the propagation speed of the shock wave in the measurement target surface be V, let the projectile target coordinates be (X, Y);

[0049] Step 2, live ammunition shooting, when the projectile passes through the predetermined measurement target surface, the shock wave sound signal generated by the supersonic projectile sequentially reaches the eight main light rays 13 and side light rays 14 emitted by four dual-path laser light sources, and causes the light rays reaching the four laser receiving devices to change instantly, and the four laser receiving devices output four-path projectile simulation signals;

[0050] Step 3, the projectile signal acquisition and processing device 9 acquires the four-way projectile simulation signals output by the four laser receiving devices, and processes the four-way projectile simulation signals; obtains the time T when the projectile shock wave acoustic signal reaches the main light 13 and the side light 14 of the left dual-path laser light source 4 X左主 and T X左侧 , the time when the main light 13 and the side light 14 of the dual-path laser light source 2 arrive at the right side is T X右主 and T X右侧 , the time when the main light 13 and the side light 14 of the double-path laser light source 1 above arrive at T Y上主 and T Y上侧 , the time when the main light 13 and the side light 14 of the dual-path laser light source 3 reach the bottom is T Y下主 and T Y下侧 The time difference between the projectile shock wave acoustic signal reaching the two main light beams 13 of the right dual-path laser light source 2 and the left dual-path laser light source 4 is calculated to be ΔT X主 =T X右主 -T X左主 The time difference between the projectile shock wave acoustic signal reaching the two main rays 13 of the upper dual-path laser light source 1 and the lower dual-path laser light source 3 is calculated to be ΔT Y主 =T Y上主 -T Y下主 ; The propagation velocity V of the shock wave in the measurement target surface is calculated as:

[0051] Step 4: On the target surface, the distance between the impact point 23 and the main light 13 of the right dual-path laser light source 2 is: The distance between the impact point 23 and the main light 13 of the left dual-path laser light source 4 is: The distance between the impact point 23 and the main light 13 of the upper dual-path laser light source 1 is: The distance between the impact point 23 and the main light 13 of the dual-path laser light source 3 below is: According to the propagation characteristics of the projectile shock wave, the time when the projectile hits the measurement target surface is taken as the time starting reference, and the time when the shock wave reaches the main light 13 of the dual-path laser light source 2 on the right side of the target surface is: The time for the shock wave to reach the main light 13 of the dual-path laser light source 4 on the left side of the target surface is: The time for the shock wave to reach the main light 13 of the dual-path laser light source 1 above the target surface is: The time for the shock wave to reach the main light 13 of the dual-path laser light source 3 below the target surface is:

[0052] Step 5, so we have: Further solving can get the target coordinates of the projectile:

[0053] in:

[0054] ΔT X主 =T X右主 -T X左主 , ΔT Y主 =T Y上主 -T Y下主 ;

[0055] Finally, the projectile impact coordinates (X, Y) are obtained.

[0056] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the implementation methods of the present invention, and should be understood that the protection scope of the present invention is not limited to such special statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. A device for measuring the target coordinates of a large-target supersonic projectile, characterized in that: include: Four dual-path laser light sources, four laser receiving devices and one projectile signal acquisition and processing device; The four dual-path laser light sources are respectively located above, to the right, below and to the left of the measurement target surface. Each dual-path laser light source includes two mutually parallel light rays, namely, a main light ray and a side light ray. The light emitted by the laser forms a rectangular frame inside the measurement target surface. The four light rays emitted by the upper and lower dual-path laser light sources are mutually parallel, and the four light rays emitted by the left and right dual-path laser light sources are mutually parallel. Four laser receiving devices are located at the four corners of the measurement target surface, respectively, to receive the light emitted by four dual-path laser light sources and output four-path projectile simulation signals; The projectile signal acquisition and processing device is used to collect four-channel projectile simulation signals output by four laser receiving devices, process the four-channel projectile simulation signals, obtain eight time values ​​when the projectile shock wave sound signal reaches eight laser lights in the upper, right, lower and left directions, and calculate the projectile target coordinates based on the eight time values ​​and the distance value between the main light and the side light generated by the dual-path laser light source; the four laser receiving devices and the projectile signal acquisition and processing device are connected by a signal transmission cable.

2. A device for measuring the target coordinates of a large-target supersonic projectile according to claim 1, characterized in that: The dual-path laser light source includes: a point laser, a front semi-transparent and semi-reflective mirror, a front reflector, a main light, a side light, a rear reflector, and a rear semi-transparent and semi-reflective mirror; the light emitted by the point laser first passes through the front semi-transparent and semi-reflective mirror, the transmitted light is the main light, and the reflected light is then reflected by the front reflector to become the side light, and the side light and the main light are parallel to each other; the main light propagates forward in a straight line, and then passes through the rear semi-transparent and semi-reflective mirror, and the transmitted light is received by the laser receiving device; the side light is reflected by the rear reflector, and then reflected by the rear semi-transparent and semi-reflective mirror to be received by the laser receiving device.

3. The device for measuring the target coordinates of a large-target supersonic projectile according to claim 2, characterized in that: The point laser is a red light point laser with a wavelength of 650nm.

4. The device for measuring the target coordinates of a large-target supersonic projectile according to claim 1, characterized in that: The laser receiving device comprises: a narrowband filter, an aperture piece at the front end of a lens, a focusing lens, an aperture piece at the rear end of a lens, a photoelectric detection device and a signal processing circuit board; the light emitted by the dual-path laser light source sequentially passes through the narrowband filter, the aperture piece at the front end of the lens, the focusing lens and the aperture piece at the rear end of the lens and is finally received by the photoelectric detection device; after the supersonic projectile passes through the measurement target surface, the conical projectile shock wave acoustic signal generated by the projectile sequentially reaches the edge of the measurement target surface and compresses the air that propagates the laser light, thereby causing the laser light to vibrate, and finally causing the light energy reaching the photoelectric detection device to change rapidly; the photoelectric detection device converts the rapidly changing light signal into a changing weak current signal; the signal processing circuit board performs current-voltage conversion, signal amplification and filtering on the current signal; and finally four laser receiving devices output four projectile simulation signals, each of which contains two projectile shock wave electrical signals corresponding to the moment when the projectile shock wave acoustic signal hits the main light and the side light.

5. A method for measuring the target coordinates of a large-target supersonic projectile, characterized in that: The method is implemented on the basis of the large target surface supersonic projectile target coordinate measuring device described in one of claims 1 to 4, and specifically includes: by processing four-way projectile simulation signals, calculating the time values ​​of eight projectile shock wave electrical signals in the four-way projectile simulation signals, and finally solving the projectile target coordinates according to the projectile target coordinate calculation model of the measuring device.

6. A method for measuring the target coordinates of a large target surface supersonic projectile according to claim 5, characterized in that: The specific steps include: Step 1: Take the center line of the main light corresponding to the two dual-path laser light sources on the top and bottom as the X-axis, take the center line of the main light corresponding to the two dual-path laser light sources on the left and right as the Y-axis, establish a plane rectangular coordinate system XOY, the plane corresponding to the coordinate system XOY is the measurement target surface, and set the distance between the main light corresponding to the two dual-path laser light sources on the left and right as S X , let S be the distance between the main rays corresponding to the two dual-path laser light sources above and below Y , let the distance between the main light and the side light inside each dual-path laser light source be D, let the propagation speed of the shock wave in the measurement target surface be V, let the projectile target coordinates be (X, Y); Step 2, live ammunition shooting, when the projectile passes through the predetermined measurement target surface, the shock wave generated by the supersonic projectile reaches the eight main rays and side rays emitted by the four dual-path laser light sources in sequence, and causes the light reaching the four laser receiving devices to change instantly, and the four laser receiving devices output four-path projectile simulation signals; Step 3: The projectile signal acquisition and processing device acquires four projectile simulation signals output by four laser receiving devices and processes the four projectile simulation signals; obtains the time T when the projectile shock wave acoustic signal reaches the main light and side light of the left dual-path laser light source X左主 and T X左侧 , the time when the main light and the side light of the dual-path laser light source on the right side arrive at T X右主 and T X右侧 , the time when the main light and the side light of the dual-path laser light source on the upper side arrive at T Y上主 and T Y上侧 , the time when the main light and the side light of the dual-path laser light source on the lower side arrive at T Y下主 and T Y下侧 The time difference between the projectile shock wave sound signal reaching the main light of the right and left dual-path laser light sources is calculated to be ΔT X主 =T X右主 -T X左主 The time difference between the projectile shock wave sound signal reaching the main light of the upper and lower dual-path laser light sources is calculated to be ΔT Y主 =T Y上主 -T Y下主 ; The propagation velocity V of the shock wave in the measurement target surface is calculated as: Step 4: On the target surface, the distance between the impact point and the main light of the right dual-path laser light source is: The distance between the impact point and the main light of the left dual-path laser light source is: The distance between the impact point and the main light of the dual-path laser light source above is: The distance between the impact point and the main light of the dual-path laser light source below is: According to the propagation characteristics of the projectile shock wave, taking the impact of the projectile on the target surface as the starting time reference, the time for the shock wave to reach the main light of the dual-path laser light source on the right side of the target surface is: The time it takes for the shock wave to reach the main light of the dual-path laser light source on the left side of the target surface is: The time it takes for the shock wave to reach the main light of the dual-path laser light source above the target surface is: The time it takes for the shock wave to reach the main light of the dual-path laser light source below the target surface is: Step 5, so we have: Further solve to get the projectile target coordinates: in: ΔT X主 =T X右主 -T X左主 ; ΔT Y主 =T Y上主 -T Y下主 ; Finally, the projectile impact coordinates (X, Y) are obtained.

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