An all-weather enhanced external ballistic parameter measurement device and method

Abstract

The present invention belongs to the technical field of range testing, and particularly relates to an all-day enhanced external ballistic parameter measurement device and method. The device includes an infrared transceiver device, a wireless data transceiver device, a computer, and two unmanned aerial vehicles (UAVs). A sky screen target is installed under each of the two UAVs. The sky screen target includes a housing and a lens group fixedly arranged therein that can form an N-shaped light curtain. When a projectile passes through the N-shaped light curtain, the light flux entering the lens group becomes smaller, and the change in the light flux is converted into an electrical signal; the electrical signal can be calculated by the computer to obtain projectile information. The present invention has a high safety factor, accurate measurement, a wide range of applications, and the targeted selection of an ultrasonic altimeter can avoid the influence of using an infrared altimeter on the detection accuracy of the double N-shaped light curtain. The device of the present invention has a simple structure, low cost, is convenient to carry and operate, has a simple target layout for the device, and has a relatively high position tolerance, greatly improving the adaptability.

Description

Technical Field:

[0001] The present invention belongs to the technical field of range testing, and mainly relates to a sky screen target measuring device for measuring the flight speed of projectiles of various calibers using optoelectronic technology. Specifically, it relates to an all-day enhanced external ballistic parameter measuring device and method. Background Art:

[0002] In the research and production of guns, cannons, projectiles, and propellants, the initial velocity of the projectile is a key parameter that needs to be frequently tested. Currently, the more common method in production verification ranges is to jointly form a velocity measurement system with an interception device and a time meter. The interception devices commonly used in domestic ranges at present are coil targets, sky screen targets, and light curtain targets, all of which use non-contact measurement principles to detect the moment when the projectile passes through the detection area.

[0003] For existing sky screen targets, due to the limitations of their working principles, they must be aligned with the sky having a certain brightness during use. Therefore, they are generally used outdoors and cannot work at night. For some live ammunition tests using sky screen targets outdoors, due to various conditions, the tests sometimes continue until it gets dark. At this time, there is an urgent need for a sky screen target that can work at night. Sometimes, during the test, thunderstorm, cloudy, or light rain weather occurs. Since the dark clouds cover the sky, it affects the sufficient sky brightness required for the sky screen target to work, causing the ongoing test to be interrupted. In summary, in actual tests, a sky screen target that is not affected by sky brightness and can work at night and is convenient for mobile use is needed. To make the sky screen target not affected by sky brightness, artificial light sources must be used to brighten the background area where the sky screen target's field of view is aligned, and its brightness should be sufficient to ensure the normal operation of the sky screen target. Commonly used artificial light sources usually use artificial light sources with a fixed brightness. In the entire system, the artificial light source is the place with the highest power consumption ratio. Using a high-power fixed light source will cause waste of power consumption during use, and using a low-power light source may not be able to ensure the normal operation of the entire system. Therefore, in order to ensure the operation of the system, only high-power light sources can be used, resulting in waste of power consumption.

[0004] The sky screen target equipped with artificial light sources can be used indoors and at night because it is not affected by the sky brightness. For example, the light source of the sky screen target mentioned in Chinese Patent ZL 200420086340.2 can meet the above requirements, but its layout is extremely difficult. First, when laying out the sky screen target, it is required that the two light curtains of the sky screen target are at a certain target distance and parallel to each other, and the configured artificial light sources must also be strictly parallel and within the field of view of the sky screen target, which increases the difficulty of target layout; second, when the sky screen target is placed below the ballistic trajectory, it is even more difficult to install the light source directly above the sky screen target. There is also the XGK-2002 type light screen target widely used in domestic shooting ranges. Since it uses LED light sources, it can work at night and can also be used indoors and outdoors. However, due to the limited target surface of the light screen target and the fact that a frame for supporting instruments must be used in the area where the projectile passes through, the frame is at risk of being hit by the projectile, so it cannot be used for some projectiles with clap petals and cartridge belts.

[0005] In summary, the current velocity measurement system has the following disadvantages: the sky screen target cannot be used when the light source is insufficient, the frame structure brings difficulties in erection and low safety factor, and the use of fixed high-power light sources results in waste of power consumption. Continuously improving the velocity measurement device based on the sky screen target and seeking a sky screen target detection device and method that can supplement the light source and has no frame structure are the key research directions for those skilled in the art. Summary of the Invention:

[0006] The purpose of the present invention is to provide an all-weather enhanced external ballistic parameter measurement device and method to solve the problems existing in the prior art, such as being unable to be used when the light source is insufficient, the attached frame structure having difficulties in erection and low safety factor, and the waste of power consumption caused by using fixed light sources.

[0007] An all-weather enhanced external ballistic parameter measurement device includes an infrared transceiver device, a wireless data transceiver device, and a computer, and also includes two unmanned aerial vehicles (UAVs). Sky screen targets are installed below both UAVs. The sky screen target includes a housing and a lens group fixedly arranged therein that can form an N-shaped light curtain; altimeters are installed on the sides of the quadrotor UAVs, and an infrared transceiver device and a wireless data transceiver device are respectively installed on the opposite sides of the two UAVs; a dot matrix LED light is located below the UAVs, and the LED light emitted by the dot matrix LED is in the same plane as the sky screen target.

[0008] Further, the above lens group includes a columnar housing, a lens is arranged along the axis inside the columnar housing, and an N-shaped photodiode is arranged at the end of the columnar housing.

[0009] Further, the above UAVs are selected as quadrotor UAVs; the altimeters are selected as ultrasonic altimeters.

[0010] Further, the measurement method of the above all-weather enhanced external ballistic parameter measurement device includes the following steps:

[0011] Two quadrotor unmanned aerial vehicles fly above the dot matrix LED. After the wireless data transceiver is powered on, the altimeter transmits the current altitude H to the computer through the wireless data transceiver. The computer adjusts the brightness of the dot matrix LED according to the ultrasonic altimeter. The light flux passing through the N-shaped light curtain into the lens group becomes smaller. The change in the light flux generates a corresponding signal of the projectile passing through the curtain through the computer and is converted into an electrical signal through the lens; the electrical signal is transmitted to the computer through the wireless data transceiver; the computer aggregates the data and can obtain the projectile information through calculation.

[0012] Further, the formula for adjusting the brightness of the dot matrix LED is

[0013]

[0014] where L is the brightness of the dot matrix LED, f is the focal length of the lens, H is the altitude of the ultrasonic altimeter, F is the aperture number, and E is the minimum light flux of the lens.

[0015] Further, the above calculation process is as follows:

[0016] Within the range of the 7 target surfaces of the double N-shaped light curtain, the times for the projectile to pass through the 6 target surfaces of the N-shaped are set as t1, t2, t3, t4, t5, and t6 respectively. S is the distance between the two lens groups, and the angle between the light curtains G1 and G2 is α

[0017]

[0018] where the angle between the projection of the velocity vector on the YOZ plane and the XOZ plane is: γ2, and the distance between the speed measurement targets formed by G2 and G5 is Scosβ. Further, the above projectile information includes the pitch angle θ, azimuth angle γ, velocity V, coordinate quantity X, and / or coordinate quantity y. Compared with the prior art, the advantages of the present invention are as follows:

[0019] (1) High safety factor: The height can be adjusted by controlling the unmanned aerial vehicle to be applicable to the ballistic detection of more projectiles, avoiding the use of a frame structure to avoid damage to the frame structure caused by projectile fragments, saving costs indirectly, and ensuring the safety of personnel.

[0020] (2) Accurate measurement and wide application range: The height of the quadrotor unmanned aerial vehicle and the brightness of the dot matrix photoelectric tube can be adjusted according to different projectiles to make the measurement more accurate; it can be tested at night or when the light brightness is insufficient, not affected by the change of sky brightness and the alternation of day and night, greatly improving the timeliness of the experiment.

[0021] (3) Based on the usage environment of the present invention, the targeted selection of an ultrasonic altimeter can avoid affecting the detection accuracy of the double N-shaped light curtain when using an infrared altimeter.

[0022] (4) The device has a simple structure, low cost, is convenient to carry and operate, the device layout of the target is simple, and has a relatively high position tolerance, greatly improving the adaptability.

[0023] (5) Adjust the brightness of the dot matrix LED in real time according to the height, saving power consumption, and at the same time adapting to the detection of various projectile parameters. Description of the Drawings:

[0024] Figure 1 is a schematic structural diagram of the present invention;

[0025] Figure 2 is Figure 1 the view in the A direction of

[0026] Figure 3 is Figure 1 the bottom view of the quadrotor UAV in

[0027] Figure 4 is the detailed view of the light curtain of the present invention;

[0028] Figure 5 is the schematic structural diagram of the lens group of the present invention.

[0029] In the figure: 1. Dot matrix LED lamp; 2. Quadrotor UAV; 3. Infrared transceiver device; 4. Altimeter; 5. Wireless data transceiver device; 6. Sky screen target; 7. N-shaped light curtain; 8. Lens group; 9. LED light. Detailed Embodiment:

[0030] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] See Figures 1 - 3, An all-weather enhanced external ballistic parameter measurement device, comprising an infrared transceiver device 3, an ultrasonic altimeter 4, a wireless data transceiver device 5, a computer, a sky screen target 6, and two quadrotor unmanned aerial vehicles 2. Sky screen targets 6 are installed below both of the two quadrotor unmanned aerial vehicles 2. The sky screen target 6 includes a housing and a lens group 8 fixedly arranged therein that can form an N-shaped light curtain 7. The lens group 8 includes a columnar housing. A lens is arranged along the axis (optical path direction) inside the columnar housing, and an N-shaped photodiode is arranged at the end of the columnar housing. Altimeters 4 are installed on the sides of the quadrotor unmanned aerial vehicles 2. An infrared transceiver device 3 and a wireless data transceiver device 5 are respectively installed on the opposite sides of the two quadrotor unmanned aerial vehicles 2; The dot matrix LED light 1 is located below the unmanned aerial vehicle, and the led light 9 emitted by the dot matrix LED 1 is in the same plane as the sky screen target 6.

[0032] The design principle of the present invention is as follows: As Figure 1 , The distance measurement by the infrared transceiver device 3 between the two quadrotor unmanned aerial vehicles 2 ensures that the plane where the two quadrotor unmanned aerial vehicles 2 are located is at the same level as the dot matrix LED light 1. The ultrasonic altimeter 4 carried by the quadrotor unmanned aerial vehicle 2 ensures the overall height stability. The quadrotor unmanned aerial vehicle 2 is equipped with a wireless data transceiver device 5. The quadrotor unmanned aerial vehicle 2 carries a sky screen target 6 below, and the N-shaped light curtain 7 generated by the lens group 8 in the sky screen target 6 is in the same plane as the light generated by the dot matrix LED light 1. The wireless data transceiver device 5 transmits the height information of the quadrotor unmanned aerial vehicle 2, the distance information between the two quadrotor unmanned aerial vehicles 2, and the circuit signal of the passing projectile to the computer, and the computer processes the signals and then controls the brightness of the dot matrix LED and the external ballistic parameter measurement data in real time.

[0033] As Figure 2 , The real-time brightness of the dot matrix LED can be obtained according to the height information of the quadrotor unmanned aerial vehicle 2. The N-shaped light curtain 7 formed by the sky screen target 6 uses natural light as the background during the day, and uses the LED light 9 as the background when it is night or the light conditions are poor. Due to the function of the N-shaped photodiode, the field of view of the imaging lens is a fan shape with a certain thickness, which is usually called the sky screen, see Figure 4 . When the projectile passes through the N-shaped light curtain 7, it will block part of the light entering the lens, resulting in a decrease in the light flux entering the lens group 8. The change in the light flux can generate a corresponding projectile passing curtain signal through the photoelectric conversion device and the signal processing circuit. The user can obtain the measurement of the projectile passing target ballistic parameters by using the computer to summarize this information.

[0034] The measurement method provided by the present invention for the all-weather enhanced external ballistic parameter measurement device includes the following steps:

[0035] (1) Two quadrotor drones 2 fly above the dot matrix LED 1. After the wireless data transceiver 5 is powered on, the ultrasonic altimeter 4 transmits the current height H to the computer through the wireless data transceiver 5, and the computer adjusts the brightness of the dot matrix LED 1 according to the ultrasonic altimeter 4. The calculation formula is:

[0036]

[0037] Where L is the brightness of the dot matrix LED, f is the focal length of the lens, H is the height of the ultrasonic altimeter, and F is the f-number.

[0038] (2) When the projectile passes through the N-shaped light curtain 7, it will block part of the light entering the lens, resulting in a decrease in the light flux entering the lens group 8. The change in the light flux generates a corresponding projectile passing-through curtain signal through the computer and is converted into an electrical signal through the lens; the electrical signal transmits data to the computer through the wireless data transceiver 5;

[0039] (3) The computer aggregates the data and performs calculations. The calculation process is as follows:

[0040] The times when the projectile passes through the 6 target surfaces of the N shape within the target surface range of the double N-shaped light curtain 7 are t1, t2, t3, t4, t5, and t6 respectively. S is the distance between the two lens groups, and the angle between the light curtains G1 and G2 is α.

[0041]

[0042] Where the angle between the projection of the velocity vector on the YOZ plane and the XOZ plane is γ2, and the target distance of the velocity measurement target formed by G2 and G5 is Scosβ.

[0043] Through calculation, the pitch angle θ, azimuth angle γ, velocity V, coordinate quantity X, and / or coordinate quantity y of the projectile can be obtained.

[0044] As described above, it is only the preferred embodiment of the present invention and is not used to limit the protection scope of the present invention. Any equivalent structural changes made using the description and drawings of the present invention should be included in the patent protection scope of the invention.

Claims

1. An all-day enhanced external ballistic parameter measurement device, comprising an infrared transceiver device (3), a wireless data transceiver device (5) and a computer, characterized in that, It also includes two drones, with sky targets (6) installed at the lower parts of the two drones. The sky target (6) includes a housing and a lens group (8) fixedly installed therein that can form an N-shaped light curtain (7); altimeters (4) are installed on the sides of the quadcopter drones (2), and an infrared transceiver device (3) and a wireless data transceiver device (5) are respectively installed on the opposite sides of the two drones; the dot matrix LED light (1) is located below the drones, and the LED light (9) emitted by the dot matrix LED (1) is in the same plane as the sky target (6).

2. The all-day enhanced external ballistic parameter measurement device according to claim 1, wherein: The lens group (8) includes a columnar housing. A lens is arranged along the axis inside the columnar housing, and an N-shaped photodiode is arranged at the end of the columnar housing.

3. An all-day enhanced external ballistic parameter measurement device according to claim 1 or 2, characterized in that: The drones selected are quadcopter drones (2); the altimeters (4) selected are ultrasonic altimeters.

4. The measurement method of an all-day enhanced external ballistic parameter measurement device according to claim 1, characterized in that It includes the following steps: The two drones fly above the dot matrix LED (1). After the wireless data transceiver device (5) is powered on, the altimeter (4) transmits the current height H to the computer through the wireless data transceiver device (5). The computer adjusts the brightness of the dot matrix LED (1) according to the altimeter (4). After the projectile passes through the double N-shaped light curtain (7) composed of six light curtain planes of G1, G2, G3, G4, G5, and G6, the light flux entering the lens group (8) becomes smaller. The change in the light flux generates a corresponding projectile passing curtain signal through the computer and is converted into an electrical signal through the lens; the electrical signal transmits data to the computer through the wireless data transceiver device (5); the computer aggregates the data and calculates to obtain the projectile information.

5. The measuring method of an all-day enhanced external ballistic parameter measuring device according to claim 4, characterized in that, The formula for adjusting the brightness of the dot matrix LED is where L is the brightness of the dot matrix LED, f is the focal length of the lens, H is the height of the ultrasonic altimeter, F is the aperture number, and E is the minimum light flux of the lens.

6. The measurement method of an all-day enhanced external ballistic parameter measurement device according to claim 4 or 5, characterized in that The calculation process is as follows: Within the target surface range of the double N-shaped light curtain 7, the times for the projectile to pass through the 6 target surfaces of the N shape are set as t1, t2, t3, t4, t5, and t6 respectively. S is the distance between the two lens groups, and the included angle between the light curtains G1 and G2 is α where the included angle between the projection of the velocity vector on the YOZ plane and the XOZ plane is γ2, and the target distance for speed measurement formed by G2 and G5 is Scosβ.

7. The measurement method of an all-day enhanced external ballistic parameter measurement device according to claim 6, characterized in that, The projectile information includes the pitch angle θ, azimuth angle γ, velocity V, coordinate quantity X, and / or coordinate quantity y.

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