Intelligent simulation training bomb for ground attack of unmanned aerial vehicle

Abstract

The invention provides an intelligent simulation training bomb for ground attack of an unmanned aerial vehicle. The training bomb comprises a bomb body, a thrust reverser, a fairing, a mounting frame, a smoke tank and a control module. Wherein a gas cabin is arranged in the bomb body, and the thrust reverser is composed of an electromagnetic valve and a multi-way pipe. The mounting frame integrates a fuming tank, a control module and a motion sensing module, and the control module calculates the falling speed, the grounding time and the position coordinates in real time based on data of all sensors of the motion sensing module so as to control the electromagnetic valve to be opened, so that compressed gas in the gas cabin is ejected from a reverse thrust gas opening in the circumferential direction of the fairing through the multi-way pipe; in combination with deformation buffering of the fairing made of an elastic material, nondestructive recovery of the training bomb is achieved, and repeated use is facilitated. And meanwhile, the fuming tank is controlled to trigger and release tracing smoke, so that an impact point is marked, and parameters such as latitude and longitude during landing are sent to a ground guide training system to serve as an evaluation basis of throwing precision.

Description

Technical Field

[0001] The present invention relates to the technical field of training bombs, and in particular to an intelligent simulation training bomb for ground attacks by unmanned aerial vehicles (UAVs). Background Art

[0002] Drone-based ground-to-ground bombing attacks are an effective method for striking ground targets, including manpower and equipment, and are a new combat strategy that has emerged in recent years. The operational skill and accuracy of drone-based ground-to-ground attacks are crucial factors influencing their effectiveness in combat. Only with skilled operation can an attack be unexpected, and only with a quick withdrawal after an attack can the operator effectively protect itself. Therefore, improving operational training in drone-based ground-to-ground bombing attacks is crucial for achieving effective ground-to-ground attacks in wartime. An effective method for ensuring drone-based ground-to-ground bombing training is to use training munitions, which reduces training costs, ensures safety, and significantly improves training efficiency.

[0003] However, existing drone simulation training projectile technology suffers from irreversible design flaws, severely limiting training costs. Its core issue lies in its non-repeatability. For example, the patent application number 202421038592.1 discloses a training projectile without a ground impact cushioning structure, resulting in plastic deformation and destruction upon impact. More critically, the internal pyrotechnics (such as electric detonators and explosives) trigger a self-destructive explosion, rendering it completely useless after a single use. This dual destruction mechanism necessitates the use of a new projectile for each training session. Combined with the stringent regulatory requirements for pyrotechnics (specialized production, explosion-proof transportation, and ammunition depot storage), the overall cost per projectile remains high. Even improved solutions attempt to reuse the projectile through parachute recovery, but the drift in landing point caused by the deployment altitude renders the training data ineffective, effectively leading to ineffective reuse and deviating from the core requirements of a modern, sustainable training system. Summary of the Invention

[0004] In response to the deficiencies raised in the above-mentioned background technology, the present invention provides an intelligent simulation training bomb for UAV ground attack.

[0005] The present invention adopts the following technical solutions: An intelligent simulated training missile for UAV ground attack, comprising: A projectile having a gas chamber disposed therein, wherein the gas chamber is filled with compressed gas; a thrust reverser device disposed in the projectile body, the thrust reverser device comprising a solenoid valve and a multi-way pipe, an air inlet end of the solenoid valve being connected to the gas compartment, and an air exhaust end of the solenoid valve being connected to one of the ports of the multi-way pipe; A fairing is fixed to the front end of the projectile, an altitude sensor is fixed in the fairing, and the altitude sensor detects the current height above the ground. The fairing has a plurality of reverse thrust air ports distributed circumferentially toward the front end of the projectile, and each of the reverse thrust air ports is connected to the remaining ports of the multi-way pipe. A mounting bracket fixed to the tail of the missile body, the mounting bracket being combined with a UAV hanging device; a smoke canister mounted to the mounting frame; A control module receives the height sensor signal, and calculates the estimated touchdown time based on the current height from the ground and the falling speed, and the control module is preset with a height threshold and a time threshold; wherein, When the altitude sensor detects that the height from the ground drops to the altitude threshold, the control module triggers the solenoid valve to open, so that the compressed gas in the gas cabin is regulated by the solenoid valve and then diverted to each of the reverse thrust air ports through the multi-way pipe and ejected outward; When the estimated touchdown time calculated by the control module reaches a preset threshold, the control module triggers the smoke canister to release tracer smoke.

[0006] In a possible implementation, the fairing is made of elastic material.

[0007] In a possible implementation, a side wall of the projectile is provided with an inflation port communicating with the gas compartment.

[0008] In one possible implementation, the mounting frame includes a back cover, a second screw, an elastic member, a pressure plate and a contact plate, a plurality of second screws are circumferentially distributed on the end surface of one end of the back cover, the pressure plate is fixed to the second screw, and a mounting notch is provided on one side of the pressure plate, the contact plate is provided between the pressure plate and the back cover, and the contact plate forms an elastic clamping structure with the pressure plate through the elastic member; a circle of protruding limiting portions is provided on the bottom annular surface of the smoking canister, the smoking canister is embedded in the mounting notch, and the limiting portion is pressed toward the pressure plate by the contact plate, so that the smoking canister is fixed to the mounting frame.

[0009] In one possible implementation, the contact plate has a copper-clad electrode, which is electrically connected to the control module. A contact is provided at the bottom of the smoking canister. When the smoking canister is embedded in the mounting notch, the elastic member presses the contact plate toward the smoking canister, causing the copper-clad electrode to contact the contact of the smoking canister.

[0010] In one possible implementation, the training missile also includes a motion sensing module and a wireless data link module. The motion sensing module is used to obtain data such as the position and posture of the training missile and send the data to the control module. The control module transmits the parameter information of the training missile to the ground control system wirelessly and receives instructions from the ground control system.

[0011] In one possible implementation, the mounting frame includes a back cover and a first screw, a plurality of the first screws are circumferentially distributed on the end surface of one end of the back cover, the circuit board of the control module, the circuit board of the motion sensing module and the circuit board of the wireless data link module are all fixed to the first screw, and the back cover is fixed to the port at the tail of the projectile, so that the first screw, the control module, the motion sensing module and the wireless data link module are all embedded in the projectile.

[0012] In a possible implementation, the rear cover is embedded in the projectile body, and screws are radially inserted inwardly from the outside of the projectile body to connect with the rear cover for fixation.

[0013] From the above description of the structure of the present invention, it can be seen that compared with the prior art, the present invention has the following advantages: when the altitude sensor detects that the training missile has descended to the preset altitude threshold of the control module, the control module starts the solenoid valve of the reverse thrust device to release compressed gas to the multi-way pipe, so as to divert the compressed gas in the missile body to the outside of the fairing. In conjunction with the elastic fairing, a double buffer can be formed for the training missile touching the ground, so that the training missile can land at a safe speed and prevent damage. The training missile of the present invention can still maintain accurate data collection and transmission capabilities after experiencing multiple release impacts, so as to facilitate reuse, which meets the core requirements of a sustainable training system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention.

[0016] Figure 3 for Figure 2 Schematic diagram of the front end of the training projectile.

[0017] Figure 4 It is a schematic diagram of the three-dimensional structure of the reverse thrust device.

[0018] Figure 5 for Figure 2 Schematic diagram of the tail of a training projectile.

[0019] Figure 6 This is a schematic diagram of the three-dimensional structure of the mounting frame connecting the smoke canister and various electronic modules.

[0020] Figure 7for Figure 6 Schematic diagram of the upper end of the mounting frame without the smoke canister installed.

[0021] Figure 8 This is a schematic diagram of the three-dimensional structure of the smoke canister from an upward perspective.

[0022] Figure 9 Schematic diagram of the control of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of this application clearer, this application will be further described in detail below with reference to the accompanying drawings.

[0024] In the following, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0025] In addition, in this application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0026] The present invention provides a UAV ground attack intelligent simulation training bomb, as shown in the attached Figure 1 and 2 As shown, the training missile includes: a missile body 1, a thrust reverser 2, a fairing 3, a mounting bracket 4, a smoke canister 6, and a control module 5. The missile body 1 has a cavity formed inside, the fairing 3 is fixed to the front end of the missile body 1, and the thrust reverser 2 is disposed within the missile body and connected to the fairing 3. The mounting bracket 4 is fixed to the rear end of the missile body 1 and is used to be combined with the drone hanging device. The smoke canister 6 and the control module 5 are both fixed to the mounting bracket 4, with the smoke canister 6 located outside the missile body 1 and the control module 5 located inside the missile body 1.

[0027] The fairing 3 is a conical structure, effectively guiding the airflow for a smooth transition, reducing turbulence at the moment of separation between the training missile and the drone, and avoiding the risk of loss of control due to asymmetric aerodynamic forces. Meanwhile, four tail fins 12 are fixed symmetrically at 90 degrees to the tail annulus of the missile body 1 to ensure that the training missile descends in a correct and stable posture after airdrop.

[0028] Two partitions 11 are fixed inside the projectile body 1, forming three compartments. The compartment formed between the two partitions 11 is the gas compartment 101, which is used to be filled with compressed gas. Specifically, the side wall of the projectile body 1 is provided with an inflation port 102 connected to the gas compartment 101. This inflation port 102 is connected to an air compressor to replenish the compressed gas in the gas compartment 101, making the gas compartment 101 reusable. Preferably, a one-way valve can be installed at the inflation port 102 to prevent compressed air leakage.

[0029] As attached Figure 3 and 4 As shown, the thrust reverser 2 includes a solenoid valve 21 and a multi-way pipe 22. The air inlet end of the solenoid valve 21 is fixed to the partition 11 near the front end of the projectile 1, and the solenoid valve 21 is connected to the gas compartment 101 through the corresponding through-holes provided on the partition 11, so that the air inlet end of the solenoid valve 21 is connected to the gas compartment 101. The exhaust end of the solenoid valve 21 is connected to one of the ports of the multi-way pipe 22, and the remaining ports of the multi-way pipe 22 are connected to the outside of the front end of the projectile 1 through the pipe 23. In addition, the fairing 3 is circumferentially distributed with multiple thrust reverser ports 301 toward the front end of the projectile 1, and each thrust reverser port 301 is respectively connected to the remaining ports of the multi-way pipe 22 toward the outside of the front end of the projectile 1. In this structure, when the solenoid valve 21 is opened, the compressed gas in the gas compartment 101 is sequentially directed through the through-holes of the partition plate 11, the solenoid valve 21, and the multi-way pipe 22, where it is shunted from each reverse thrust port 301 and ejected outward from the fairing 3. This multi-directional injection design creates a uniform and stable reverse thrust field relative to the ground before the training projectile lands, effectively slowing its descent speed and thus reducing the impact of the training projectile upon impact, thus preventing damage to the projectile upon landing and making it reusable after passing technical status testing. Furthermore, the fairing 3 can be made of an elastic material, so that when the training projectile lands, it elastically deforms to form a cushion, further reducing the impact of the ground on the training projectile.

[0030] As attached Figure 5 and 6 As shown, the training missile of the present invention is also equipped with a motion sensing module 7, a wireless data link module 8, and a power storage module 9. The power storage module 9 is used to provide electrical energy to the training missile. The wireless data link module 8 is used to establish a communication connection with the ground control system, facilitating the control module 5 to wirelessly transmit training missile parameter information to the ground control system and receive commands from the ground control system. This data exchange forms an integrated air-ground training system, completing the controllable operation of the intelligent simulated training missile.

[0031] Please refer to the attached Figure 9The motion sensing module 7 is used to obtain data such as the position and attitude of the training projectile and transmit this data to the control module 5. Specifically, the motion sensing module 7 includes a positioning sensor, an attitude sensor, and the aforementioned altitude sensor. The positioning sensor is used to measure the longitude and latitude of the drone during various stages of flight, including the descent and landing of the intelligent simulated training projectile. The attitude sensor detects the flight attitude of the training projectile. The altitude sensor, which can be a distance sensor, is used to monitor the distance of the training projectile from the ground (i.e., its height above the ground) in real time. The altitude sensor is fixed to the fairing 3. The control module 5, which uses a single-chip microcomputer as its core control, receives signals from the positioning sensor, attitude sensor, and altitude sensor to obtain data on the position, attitude, and altitude of the training projectile after it is thrown. It also calculates the descent velocity of the training projectile. Furthermore, the control module 5 calculates the estimated touchdown time of the training projectile based on the current height above the ground and the falling velocity.

[0032] Furthermore, the control module 5 is preset with an adjustable height threshold and a time threshold, wherein the height threshold is a specified height from the ground. When the height sensor detects that the height from the ground has dropped to the height threshold, the control module 5 controls the solenoid valve 21 to start, so that the compressed gas in the gas chamber 101 is ejected outward from each reverse thrust port 301 through the multi-way pipe 22, forming a reverse thrust relative to the ground. The time threshold is the time threshold for the expected impact. When the control module 5 calculates that the expected impact time reaches the preset threshold, the control module 5 triggers the smoke canister 6 to release tracer smoke to visually indicate the impact point location, facilitating timely correction of bombing deviations. At the same time, the control module 5 sends parameters such as the longitude and latitude at the time of landing to the ground training system via the wireless data link module 8 as a basis for evaluating throwing accuracy.

[0033] Continue to refer to the attached Figure 5 and 6 The mounting frame 4 includes a rear cover 41 and first screws 42. Multiple first screws 42 are circumferentially distributed along the end surface of one end of the rear cover 41. The corners of the circuit boards for the control module 5, motion sensing module 7, wireless data link module 8, and battery storage module 9 are respectively inserted outside the first screws 42. Nuts 43 are screwed onto both sides of each circuit board to secure them. The circuit boards are clamped and secured by the two nuts 43, thereby securing the control module 5, motion sensing module 7, and battery storage module 9 to one end of the rear cover 41. The rear cover 41 is secured to a port at the rear of the projectile 1, such that the first screws 42, control module 5, motion sensing module 7, wireless data link module 8, and battery storage module 9 are all embedded within the projectile 1. The rear cover 41 can be secured by inserting screws radially inward from the outside of the projectile 1 after the rear cover 41 is embedded within the projectile 1.

[0034] It's also worth noting that the altitude sensor in motion sensing module 7 is located within fairing 3. Therefore, it's connected to a circuit board located within the tail section of projectile 1 via a data cable. This data cable passes through two partitions 11 of projectile 1 to establish a signal connection with the circuit board and altitude sensor. Preferably, both partitions 11 are equipped with cable glands, through which the data cable passes, ensuring a sealed interior of gas chamber 101.

[0035] Please refer to the attached Figure 7 The mounting frame 4 also includes a second screw 44, an elastic member 47, a pressure plate 45, and a contact plate 46, forming a quick disassembly structure for the smoke canister 6. Multiple second screws 44 are distributed circumferentially on the end surface of the rear cover 41 facing away from the first screw 42. The corners of the pressure plate 45 are respectively sleeved outside the second screws 44. Each second screw 44 is screwed onto a nut 43 on both sides of the pressure plate 45 until it is tightened, securing the pressure plate 45 relative to the rear cover 41. A mounting notch 451 is provided on one side of the pressure plate 45, corresponding to the space between the two second screws 44, to facilitate the insertion of the smoke canister 6 from between the two second screws 44 until it is embedded in the mounting notch 451.

[0036] The contact plate 46 is disposed between the pressure plate 45 and the rear cover 41. A limiting hole is provided on the contact plate 46 at a position corresponding to each second screw 44. Each limiting hole is respectively sleeved on the outside of each second screw 44, thereby limiting the contact plate 46 to slide linearly relative to the pressure plate 45 along the second screw 44. An elastic member 47 is also disposed between the contact plate 46 and the rear cover 41. The elastic force of the elastic member 47 forms a thrust that pushes the contact plate 46 toward the pressure plate 45, so that the contact plate 46 forms an elastic clamping structure that clamps the smoking canister 6 with the pressure plate 45 through the elastic member 47. Figure 8 Of particular note is the prefabricated reinforcing retaining portion 61 on the bottom surface of the smoke canister 6. During assembly, after accurately placing the retaining portion 61 of the smoke canister 6 into the clamping zone formed between the pressure plate 45 and the contact plate 46, pressure is then applied inward along the predetermined mounting notch 451, forcing the smoke canister 6 fully into the mounting notch 451. At this point, the contact plate 46 simultaneously pushes the retaining portion 61 against the pressure plate 45, clamping the retaining portion 61 within the mounting frame 4. When consumables (i.e., smoke canister 6) need to be replaced, the discarded smoke canister 6 is simply removed along the mounting notch 451. The entire process requires no tools, truly achieving a revolutionary breakthrough in the rapid replacement of combat training equipment. This innovative quick-release technology demonstrates unparalleled operational advantages in actual combat training environments, allowing training rounds to be quickly deployed in the next round of training after completing technical status testing, significantly reducing training costs.

[0037] Furthermore, the contact plate 46 utilizes a high-strength PCB circuit board design, and a copper-clad electrode 461 is provided on the side of the contact plate 46 facing the pressure plate 45. The copper-clad electrode 461 interconnects the electrical signals with the control module 5 via a circuit. A conductive contact 62 is also provided at the bottom of the smoke canister 6. When the smoke canister 6 is pushed into place along the installation notch 451, the thrust generated by the elastic member 47 causes the copper-clad electrode 461 on the contact plate 46 to form a reliable pressure contact with the contact 62 at the bottom of the smoke canister 6. This not only completes the mechanical fixation, but also simultaneously establishes a stable electrical signal connection path. This mechatronic design achieves the dual function of "plug and play"—signal conduction is automatically completed at the moment of mechanical locking, enabling the control system to control the working status of the smoke canister 6 in real time.

[0038] Preferably, the elastic member 47 can be an elastic plate fixed to the rear cover 41, and the elastic plate is made of heat-resistant elastic material to provide elastic force for the contact plate 46. Alternatively, the elastic member 47 can also be an attached Figure 7 As shown, each second screw rod 44 is sheathed with a spring.

[0039] The structure of the mounting frame 4 integrates and fixes the electronic modules into a whole, which can effectively reduce the risk of structural disintegration caused by mechanical stress concentration and ensure the integrity of the system functionality of the training projectile. Figure 6 The mounting frame 4 also includes a hanging member 48, which is fixed to the second screw rod 44 by a nut 43 in the same manner as the fixing method of the pressure plate 45. The hanging member is provided with a hanging hole 481, which is used to be combined with the hanging device of the UAV to realize the lifting and delivery of the training bomb.

[0040] After the drone flies to the ground attack bombing point and releases the training bomb of the present invention, the working method of the training bomb of the present invention is as follows: The positioning sensor, attitude sensor and altitude sensor send data to the control module 5 in real time, so that the control module 5 continuously collects the attitude, altitude, landing speed and longitude and latitude parameters of the training missile during flight, and transmits them to the ground guidance and training system through the wireless data link module 8; The altitude sensor measures the ground impact height. When the altitude sensor detects that the ground impact height has dropped to a threshold, the control module 5 controls the solenoid valve 21 to start, causing the compressed gas in the gas chamber 101 to be ejected outward from each reverse thrust port 301 through the multi-way pipe 22, thereby generating reverse thrust relative to the ground, causing the intelligent simulated training projectile to quickly decelerate and land smoothly. The control module 5 calculates the estimated touchdown time according to the descent speed and the height above the ground. When the estimated touchdown time reaches a time threshold, the control module 5 triggers the smoke canister 6 to start and release the tracer smoke. The control module 5 sends the latitude and longitude parameters at the time of landing to the ground guidance system through the wireless data link module 8 as a basis for evaluating the throwing accuracy.

[0041] As can be seen from the above method, in the training projectile of the present invention, the control module 5 can collect altitude, attitude, and position data in real time to determine the final latitude and longitude position data of the training projectile's landing. Furthermore, when the training projectile is detected to have descended to a preset altitude threshold, the solenoid valve 21 of the thrust reverser 2 is automatically activated to release compressed gas to the manifold 22, diverting the compressed gas within the projectile body 1 to the outside of the fairing 3. This, combined with the elastic fairing 3, creates a double cushion for the training projectile's impact, allowing the training projectile to land at a safe speed and prevent damage. This allows the training projectile of the present invention to maintain accurate data collection and transmission capabilities after multiple drop impacts, facilitating reuse. Furthermore, before impact, the smoke canister 6 is precisely triggered to release tracer smoke, and the impact coordinates are simultaneously transmitted back to the ground system via a wireless data link, which is then used as a basis for evaluating the accuracy of the drop. Thus, the training projectile of the present invention is reusable and offers comprehensive features such as accurate position and attitude positioning, reliable buffering protection, and real-time transmission of training data, effectively improving the practical level and safety of UAV ground-to-ground bomb attack training.

[0042] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A UAV ground attack intelligent simulation training bomb, characterized by: The training rounds include: A projectile having a gas chamber disposed therein, wherein the gas chamber is filled with compressed gas; a thrust reverser device disposed in the projectile body, the thrust reverser device comprising a solenoid valve and a multi-way pipe, an air inlet end of the solenoid valve being connected to the gas compartment, and an air exhaust end of the solenoid valve being connected to one of the ports of the multi-way pipe; A fairing is fixed to the front end of the projectile, an altitude sensor is fixed in the fairing, and the altitude sensor detects the current height above the ground. The fairing has a plurality of reverse thrust air ports distributed circumferentially toward the front end of the projectile, and each of the reverse thrust air ports is connected to the remaining ports of the multi-way pipe. A mounting bracket fixed to the tail of the missile body, the mounting bracket being combined with a UAV hanging device; a smoke canister mounted to the mounting frame; A control module receives the height sensor signal, and calculates the estimated touchdown time based on the current height from the ground and the falling speed, and the control module is preset with a height threshold and a time threshold; wherein, When the altitude sensor detects that the height from the ground drops to the altitude threshold, the control module triggers the solenoid valve to open, so that the compressed gas in the gas cabin is regulated by the solenoid valve and then diverted to each of the reverse thrust air ports through the multi-way pipe and ejected outward; When the estimated touchdown time calculated by the control module reaches a preset threshold, the control module triggers the smoke canister to release tracer smoke.

2. The training bullet according to claim 1, characterized in that The fairing is made of elastic material.

3. The training bullet according to claim 1, characterized in that: The side wall of the projectile is provided with an inflation port which is communicated with the gas cabin.

4. The training bullet according to claim 1, characterized in that The mounting frame includes a rear cover, a second screw, an elastic member, a pressure plate and a contact plate. A plurality of second screws are circumferentially distributed on the end surface of one end of the rear cover. The pressure plate is fixed to the second screw, and a mounting notch is provided on one side of the pressure plate. The contact plate is provided between the pressure plate and the rear cover, and the contact plate forms an elastic clamping structure with the pressure plate through the elastic member. A circle of protruding limiting portions is provided on the bottom annular surface of the smoking canister, the smoking canister is embedded in the mounting notch, and the limiting portion is pressed toward the pressure plate by the contact plate, so that the smoking canister is fixed to the mounting frame.

5. The training bullet according to claim 4, characterized in that: The contact plate has a copper-clad electrode, which is electrically connected to the control module. A contact is set at the bottom of the smoking can. When the smoking can is embedded in the installation notch, the elastic member presses the contact plate toward the smoking can, so that the copper-clad electrode contacts the contact of the smoking can.

6. The training bullet according to claim 1, characterized in that: The training missile also includes a motion sensing module and a wireless data link module. The motion sensing module is used to obtain data such as the position and posture of the training missile and send the data to the control module. The control module transmits the parameter information of the training missile to the ground control system wirelessly and receives instructions from the ground control system.

7. The training bullet according to claim 6, characterized in that: The mounting frame includes a rear cover and a first screw, and a plurality of the first screws are circumferentially distributed on the end surface of one end of the rear cover. The circuit board of the control module, the circuit board of the motion sensing module, and the circuit board of the wireless data link module are all fixed to the first screw. The rear cover is fixed to the port at the tail of the projectile, so that the first screw, the control module, the motion sensing module, and the wireless data link module are all embedded in the projectile.

8. The training bullet according to claim 4 or 7, characterized in that: The rear cover is embedded in the projectile body, and screws are radially passed inwardly from the projectile body to connect with the rear cover for fixation.

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