CN114870363A - Trampoline action parameter measuring system and method based on non-uniform sensor arrangement - Google Patents

Abstract

The invention discloses a trampoline action parameter measuring system and method based on non-uniform sensor arrangement, and belongs to the field of athletic performance monitoring. The system comprises N groups of laser measuring units, a high-precision time service module, a signal control and processing module and a data display terminal. The N groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline, the light paths of the laser emitting modules and the laser reflecting modules in each group of laser measuring units are coaxial, the light paths of any two groups of laser measuring units are parallel, and the vertical distances between every two adjacent groups of laser measuring units are not completely the same. The invention can be used for measuring the drop point position and the flight time of athletes, improves the measuring precision of the trampoline action parameters, and has the advantages of simple and convenient installation and operation and low cost. Aiming at the point falling characteristics of different athletes, the invention can also carry out non-uniform individualized installation, provide individualized point falling position information feedback, improve the accurate holding capacity of the athletes to the point falling positions and reduce the risk of injury.

Description

Trampoline action parameter measuring system and method based on non-uniform sensor arrangement

Technical Field

The invention relates to a trampoline action parameter measuring system and a trampoline action parameter measuring method, and belongs to the field of athletic performance monitoring.

Background

Trampoline action parameter measurement system is often seen in the competition at home and abroad, mainly realizes the measurement of every group action flying height and horizontal displacement volume in trampoline set road action. Currently, the international gymnastics association designates the eurottramp measuring system as an official scoring system for the event, and the hardware part of the system mainly comprises four strain type pressure sensors and a central processing unit, wherein the sensors and the central processing unit are in wired connection through network cables. The four pressure sensors measure the pressure change of the four supporting points of the trampoline and send the pressure value to the central processing unit. The central processing unit calculates the flight time and the drop point of the athlete according to the pressure value sum of the four points and the four-point difference, and sends the displacement, the height, the flight time and the final score to a user terminal (a mobile phone, a tablet or a computer). However, in the game, the displacement and the real value may have a large error due to the difference between the actual two-foot touch net and the algorithm model used by the athlete.

Other research institutions have attempted to measure the distance between the trampoline and the floor using ultrasonic sensors to calculate the time of flight and the amount of horizontal displacement for each set of actions. However, the research results show that the system error increases with the falling speed of the athlete, and therefore, the system error is not practically applied.

In addition, the systems are foreign devices, are high in price and complex to install and use, so that most domestic daily trampoline training and teaching still mainly take coach subjective experiences and cooperate with video playback, objective and accurate action parameter measuring means are lacked, and meanwhile, the high price also hinders the pace of promotion of trampoline events and sports to the public at home.

Disclosure of Invention

In order to reduce the measurement error of the conventional trampoline action parameter measurement system, the trampoline action parameter measurement system and method based on non-uniform sensor arrangement disclosed by the invention mainly aim to: the device is used for measuring the drop point position and the flight time of the athlete on the trampoline, improves the measuring precision of the action parameters of the trampoline, and has the advantages of simple and convenient installation and operation and low price. The invention can also carry out personalized installation according to the characteristics of the drop point position of each athlete, provides personalized drop point position information feedback for the athlete, improves the accurate holding capacity of the athlete on the drop point position, and reduces the risk of sports injury during training.

The purpose of the invention is realized by the following technical scheme.

The invention discloses a trampoline action parameter measuring system based on non-uniform sensor arrangement, which comprises a plurality of laser emitting modules, a plurality of laser reflecting modules, a high-precision time service module, a signal control and processing module and a data display terminal. The N laser emitting modules and the N laser reflecting modules are respectively in wireless connection with the signal control and processing module, and the high-precision time service module is in wired connection with the signal control and processing module; the signal control and processing module is in wireless connection with the data display terminal.

The N laser emission modules and the N laser reflection modules are paired one by one to form N groups of laser measurement units, namely the laser emission modules and the laser reflection modules are matched one by one to work. The N groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline, and the photoelectric switch of the laser emitting module in each group of laser measuring units is coaxial with the reflector of the laser reflecting module. In any group of laser measuring units, the photoelectric switch in the laser emitting module is used for being matched with a reflector in the laser reflecting module matched with the photoelectric switch, the triggering time when the photoelectric switch is shielded is measured, and meanwhile, the distance between the photoelectric switch and the adjacent laser emitting module is measured by the internal distance measuring circuit. The reflector in the paired laser reflection module is used for assisting the shielding moment measurement of the photoelectric switch of the paired laser emission module, and the internal distance measurement circuit measures the distance between the reflector and the adjacent laser reflection module. The high-precision time service module provides high-precision stable clock signals for the signal control and processing module and all the laser emission modules, and is used for time identification and duration calculation in the process of measuring the motion parameters of athletes, the time precision of the output clock signals is not lower than 1us, and the updating frequency is not lower than 1 Hz. The signal control and processing module is used for controlling the electrification of photoelectric switches of all laser emitting modules, controlling the distance measuring function of any laser emitting module and an adjacent laser emitting module, controlling the distance measuring function of any laser reflecting module and the adjacent laser reflecting module, reading the triggering time information when any laser emitting module is shielded, the distance information between any laser emitting module and the adjacent laser emitting module, and the distance information between any laser reflecting module and the adjacent laser emitting module, and wirelessly synchronizing the clock of each laser emitting module according to high-precision stable clock information output by the high-precision time service module, meanwhile calculating the falling point position and the flight time result of the trampoline action, and wirelessly transmitting the result to the data display terminal. And the data display terminal is used for receiving the information of the signal control and processing module and displaying the position of the jumping bed action flight drop point and the flight time.

The N groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline. The non-uniform installation means that the light paths of the laser emission module and the laser reflection module in each group of laser measurement units are coaxial, the light paths of any two groups of laser measurement units are parallel, and the vertical distances between two adjacent groups of laser measurement units are not completely the same.

The advantages of the non-uniform mounting are: 1. compared with the trampoline action parameter measuring system specified by the international gymnastics association at present, the system adopts the mode that each group of laser measuring units is non-uniformly installed at the bottom of the trampoline, so that the detailed non-uniform rasterization division is carried out on the bottom of the trampoline, and more accurate drop point position information of the interested area is provided for athletes, coaches and judges. 2. The non-uniform installation mode of the system can perform personalized installation according to the characteristics of the position of the drop point of each athlete, provides personalized information feedback of the position of the drop point for the athlete, improves the accurate holding capacity of the athlete on the position of the drop point, and reduces the risk of sports injury during training. 3. According to the development of the trampoline competitive game rules, the judgment standard of horizontal displacement by trampoline sports is more and more strict, and the trampoline sports are installed in a non-uniform mode with dense centers and sparse sides in advance in daily training, so that the control capability of athletes on the horizontal displacement can be enhanced in the daily training, and more rigorous game rules and technical strength are reserved. 4. In a trampoline area where athletes fall infrequently, the laser measuring units are properly sparse when installed; in the trampoline area where the athlete frequently falls, the laser measuring units are installed appropriately and densely, the measuring resolution and precision of the falling point position and the flight time of the trampoline area where the athlete frequently falls are effectively improved, and meanwhile, the cost is saved.

The method for measuring the triggering moment when the laser emission module is shielded comprises the following steps: when no object is on the optical path of the photoelectric switch of the laser emission module and the reflector of the laser reflection module matched with the photoelectric switch, the photoelectric switch in the laser emission module outputs high level; when an object appears on the optical path, the internal photoelectric switch outputs low level. The time when the photoelectric switch changes from high level output to low level is the trigger time when the photoelectric switch is blocked.

When the distance between the laser emitting module and the adjacent module is measured by the distance measuring circuit in the laser reflecting module, the laser emitting module and the distance measuring circuit in the laser reflecting module are realized by adopting a laser distance measuring technology based on a flight time method: the signal processing circuit in the two types of modules identifies the time of the signals of the laser output and the laser received by the ranging circuit, generates timing starting time and timing ending time, and further calculates to obtain distance information according to the flight time ranging principle.

The signal control and processing module controls the photoelectric switch of the laser emission module to be powered on, the signal control and processing module controls the distance measurement function of any laser emission module and the adjacent laser emission module, and the method for controlling the distance measurement function of any laser reflection module and the adjacent laser reflection module by the signal control and processing module comprises the following steps: and a signal processor in the signal control and processing module sends corresponding trigger signals to the laser emission module and the laser reflection module through a wireless communication circuit, so that different functions in the laser emission module and the laser reflection module are controlled.

The method for reading the triggering time information when the laser emitting modules are shielded, the distance information of the adjacent laser emitting modules and the distance information between the laser reflecting modules and the adjacent laser reflecting modules, which are measured by the signal control and processing module, is as follows: and a signal processor in the signal control and processing module reads the measurement data of the laser emitting module and the laser reflecting module through a wireless communication circuit in a polling mode.

The method for the signal control and processing module to wirelessly synchronize the clocks of the laser emission modules according to the high-precision and stable clock information output by the high-precision time service module comprises the following steps: and a signal processor in the signal control and processing module synchronizes clocks of all laser emission modules through a wireless communication circuit by utilizing high-precision and stable clock information output by the high-precision time service module and the existing mature clock synchronization protocol.

The method for calculating the drop point position and the flight time of the trampoline action by the signal control and processing module comprises the following steps: firstly, the signal control and processing module reads the distance between the adjacent laser emitting modules measured by each laser emitting module and the distance information between the adjacent laser reflecting modules measured by each laser reflecting module, and the bottom of the trampoline is divided into non-uniform gridding areas according to the distance information. And then, the signal control and processing module detects whether photoelectric switches in all the laser emission modules are shielded or not in real time. When an athlete is in a falling stage on the trampoline, the athlete can descend from the two feet falling points to other areas of the trampoline in different degrees along with time, shielding is formed when a part of bed surface areas descend to coaxial light paths of a photoelectric switch in the laser emission module of the corresponding area and a reflector in the laser reflection module, and the laser emission module in the corresponding area is triggered to obtain the shielded triggering time information. Because the laser emission module closest to the drop point position can be triggered before other laser emission modules in time, the signal control and processing module can obtain the drop point position of the athlete according to the read trigger moment information that the laser emission module is blocked. When the athlete is in the ascending stage on the trampoline, which is completely opposite to the descending stage, the athlete can ascend to different degrees along with time from the two feet falling points to other areas of the trampoline, and when a part of the bed surface area ascends to the position above the coaxial light path of the photoelectric switch in the laser emitting module and the reflecting mirror in the laser reflecting module in the corresponding area, the shielding disappears. When the shielding signals of all the laser emission modules disappear, the athlete is judged to leave the trampoline, the signal control and processing module starts timing at the moment, and the timing is stopped when any one laser emission module is triggered, and the time corresponds to the flight time of the athlete in the current action.

The action drop point position and flight time calculation method based on the non-uniform installation mode has the advantages that: 1. the laser measuring unit is installed in a dense area, and the calculation of the action drop point position and the flight time of the area is more accurate than that of an area where the laser measuring unit is installed sparsely. 2. The laser measurement unit is installed in a sparse area, the real-time data volume of the area is smaller than that of an area which is installed densely, the measurement speed of the system is improved, the implementation difficulty of system signal processing and calculation is reduced, and the software and hardware development cost is reduced.

The invention discloses a trampoline action parameter measuring method based on non-uniform sensor arrangement, which is used for a trampoline action parameter measuring system based on non-uniform sensor arrangement and comprises the following steps:

the method comprises the following steps: a plurality of groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline, and a photoelectric switch of a laser emitting module in each group of laser measuring units is coaxial with a reflector of a laser reflecting module;

the advantages of the non-uniform mounting are: 1. compared with the trampoline action parameter measuring system specified by the international gymnastics association at present, the system adopts the mode that each group of laser measuring units is non-uniformly installed at the bottom of the trampoline, so that the detailed non-uniform rasterization division is carried out on the bottom of the trampoline, and more accurate drop point position information of the interested area is provided for athletes, coaches and judges. 2. The non-uniform installation mode of the system can carry out personalized installation according to the characteristics of the position of the drop point of each athlete, provides personalized information feedback of the position of the drop point for the athlete, improves the accurate holding capacity of the athlete on the position of the drop point, and reduces the risk of sports injury during training. 3. According to the development of the trampoline competitive game rules, the judgment standard of horizontal displacement by trampoline sports is more and more strict, and the trampoline sports are installed in a non-uniform mode with dense centers and sparse sides in advance in daily training, so that the control capability of athletes on the horizontal displacement can be enhanced in the daily training, and more rigorous game rules and technical strength are reserved. 4. In a trampoline area where athletes fall infrequently, the laser measuring units are properly sparse when installed; in the trampoline area where the athlete frequently falls, the laser measuring units are installed appropriately and densely, the measuring resolution and precision of the falling point position and the flight time of the trampoline area where the athlete frequently falls are effectively improved, and meanwhile, the cost is saved.

Step two: the laser emitting module, the laser reflecting module, the high-precision time service module and the signal control and processing module are electrically connected with the data display terminal and powered on, and after a user clicks the data display terminal to start measurement, the signal control and processing module initializes other modules after receiving a key signal.

Step three: the signal control and processing module reads the distance between the adjacent laser emitting modules measured by each laser emitting module and the distance information between the adjacent laser reflecting modules measured by each laser reflecting module, and the bottom of the trampoline is divided into non-uniform gridding areas according to the distance information;

step four: the signal control and processing module synchronizes the clock signals of all the laser emission modules in real time, and simultaneously initializes and detects the relevant parameters and configuration of whether all the laser emission modules are shielded or not in real time.

Step five: and after the signal control and processing module reads the trigger time signal generated by any one laser emission module, starting to record the trigger time information of each laser emission module. The area corresponding to the laser emitting module triggered firstly is the drop point position of the athlete.

Step six: when the signal control and processing module reads that all the laser emission modules do not generate the blocked trigger signals any more, the trigger time information generated by the signal control and processing module is recorded as the initial time when the athlete leaves the trampoline to enter the action stage in the air.

Step seven: when the signal control and processing module reads that any laser emission module generates a shielded trigger signal, the trigger time information generated by the laser emission module is recorded as the stop time of the athlete falling on the trampoline to finish the action stage in the air. And calculating the air flight time of the athlete according to the initial moment information recorded in the step six.

The action drop point position and flight time calculation method based on the non-uniform installation mode has the advantages that: 1. the laser measuring unit is installed in a dense area, and the calculation of the action drop point position and the flight time of the area is more accurate than that of an area where the laser measuring unit is installed sparsely. 2. The laser measurement unit is installed in a sparse area, the real-time data volume of the area is smaller than that of an area which is installed densely, the measurement speed of the system is improved, the implementation difficulty of system signal processing and calculation is reduced, and the software and hardware development cost is reduced.

Step eight: and the signal control and processing module sends the calculated position of the drop point and the air flight time to the data display terminal, and the data display terminal displays related data to a user in a visual mode.

And then, the measurement of the position of the dropping point and the flight time of the motion of the athlete's own wheel is completed.

Step nine: and (5) circulating the step five to the step eight M times, namely measuring the position of the falling point and the flight time of the M-wheel action of the athlete.

Has the advantages that:

1. the invention discloses a trampoline action parameter measuring system and method based on non-uniform sensor arrangement, which realize the user-defined grid division of a trampoline area by adopting a mode of non-uniformly installing a laser emission module and a laser reflection module, and improve the resolution of an athlete drop point position.

The advantages of the non-uniform mounting are: (1) compared with the trampoline action parameter measuring system specified by the international gymnastics association at present, the system adopts the mode that each group of laser measuring units is non-uniformly installed at the bottom of the trampoline, so that the detailed non-uniform rasterization division is carried out on the bottom of the trampoline, and more accurate drop point position information of the interested area is provided for athletes, coaches and judges. (2) The non-uniform installation mode of the system can carry out personalized installation according to the characteristics of the position of the drop point of each athlete, provides personalized information feedback of the position of the drop point for the athlete, improves the accurate holding capacity of the athlete on the position of the drop point, and reduces the risk of sports injury during training. (3) According to the development of the competition rules of the trampoline sports, the judgment standard of horizontal displacement by trampoline sports is more and more strict, and the trampoline sports are installed in a non-uniform mode with dense centers and sparse sides in advance in daily training, so that the control capability of athletes on the horizontal displacement can be enhanced in the daily training, and the trampoline sports are more rigorous in competition rules and technical strength. (4) In a trampoline area where athletes fall infrequently, the laser measuring units are properly sparse when installed; in the trampoline area where the athlete frequently falls, the laser measuring units are installed appropriately and densely, the measuring resolution and precision of the falling point position and the flight time of the trampoline area where the athlete frequently falls are effectively improved, and meanwhile, the cost is saved.

2. The invention discloses a trampoline action parameter measuring system and method based on non-uniform sensor arrangement, which adopt a mode of judging a drop point by optical shielding, have high time resolution, and a dense installation area has high drop point position resolution, thereby effectively improving the measuring precision and measuring speed of the drop point position and flight time of athletes and reducing the measuring error.

Effectively improve sportsman's action placement position and time of flight measurement accuracy and measurement rate and lie in: (1) the laser measuring unit is installed in a dense area, and the measuring precision of the action drop point position and the flight time of the area is more accurate than that of an area which is installed sparsely. (2) The laser measurement unit is installed in a sparse area, the real-time data volume of the area is smaller than that of an area which is installed densely, the measurement speed of the system is improved, the implementation difficulty of system signal processing and calculation is reduced, and the software and hardware development cost is reduced.

3. The invention discloses a trampoline action parameter measuring system and method based on non-uniform sensor arrangement, which are simple in measuring system principle, easy to implement in measuring method and low in price.

Drawings

FIG. 1 is a system schematic of an embodiment of the present invention.

Fig. 2 is a schematic diagram of a laser emitting module according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of a laser reflection module according to an embodiment of the present invention.

Fig. 4 is a schematic diagram of a signal control and processing module in an embodiment of the present invention.

Fig. 5 is a schematic top view of a non-uniformly installed laser emitting module and laser reflecting module according to an embodiment of the present invention.

FIG. 6 is a flowchart of a method according to an embodiment of the present invention.

Wherein:

1-1 to 1-14 are 14 same laser emitting modules, 2-1 to 2-14 are 14 same laser reflecting modules, 3-signal control and processing modules, 4-high-precision time service modules and 5-data display terminals.

1-1 to 1-14 are the same, and taking 1-1 laser emission module as an example, the inside of the module comprises 111-photoelectric switch, 112-controller, 113-laser ranging module and 114-wireless communication module.

Since 2-1 to 2-14 are identical, taking 2-1 laser reflection module as an example, the interior of the module comprises: 211-reflector, 212-controller, 213-laser ranging module, 214-wireless communication module.

Among the 3-signal control and processing modules, 311-wireless communication module, 312-signal processor, 313-display interface module.

Detailed Description

The following describes an embodiment of a trampoline operation parameter measurement system and method based on a non-uniform sensor arrangement, with reference to the accompanying drawings and examples.

Example 1

As shown in fig. 1, the present embodiment discloses a trampoline action parameter measurement system based on non-uniform sensor arrangement, which includes: 14 laser emitting modules 1-1 to 1-14, 14 laser reflecting modules 2-1 to 2-14, a signal control and processing module 3, a high-precision time service module 4 and a data display terminal 5. 14 laser emission modules 1-1 to 1-14 and 14 laser reflection modules 2-1 to 2-14 are respectively in wireless connection with the signal control and processing module 3, and the high-precision time service module 4 is in wired connection with the signal control and processing module 3; the data display terminal 5 is connected with the signal control and processing module 3 by wire.

The 14 laser emitting modules 1-1 to 1-14 are identical. Taking the laser emitting module 1-1 as an example, the principle is shown in fig. 2, and the laser emitting module comprises: a photoelectric switch 111, a controller 112, a laser ranging module 113 and a wireless communication module 114. The photoelectric switch 111 is a retro-reflection type infrared photoelectric switch with response time of 0.25ms and maximum detection distance of 6m, and the controller 112 is a micro programmable logic controller and is provided with a high-speed digital pulse input detection port, an RS-232 communication interface and an RS-485 communication interface. The high-speed digital pulse input detection port of the controller 112 is connected with the signal output interface of the photoelectric switch 111, the RS-232 communication interface is connected with the serial port of the wireless communication module 114, and the RS-485 communication interface of the controller 112 is connected with the RS-485 interface of the laser ranging module 113. The laser ranging module 113 is a laser ranging module with the measurement precision of 1mm and the maximum sampling rate of 20Hz, and the signal output interface is an RS-485 interface. The wireless communication module 114 is a wireless module converting a UART serial port to ZigBee and can convert RS-232 into ZigBee to communicate with the signal control and processing module 3.

The 14 laser reflection modules 2-1 to 2-14 are identical. Taking the laser reflection module 2-1 as an example, the principle is shown in fig. 3, and the laser reflection module includes: a reflector 211, a controller 212, a laser ranging module 213, and a wireless communication module 214. The reflector 211 is a reflector which can be matched with the regression reflection type photoelectric switch 111 in the laser emitting module 1-1, and the controller 212 is a mini-type singlechip minimum system and is provided with RS-232 and RS-485 communication interfaces. An RS-232 communication interface of the controller 212 is connected with a serial port of the wireless communication module 214, and an RS-485 communication interface of the controller 212 is connected with an RS-485 interface of the laser ranging module 213. The laser ranging module 213 is a laser ranging module with the measurement precision of 1mm and the maximum sampling rate of 20Hz, and the signal output interface is an RS-485 interface. The wireless communication module 214 is a wireless module converting a UART serial port into ZigBee and can convert RS-232 into ZigBee to communicate with the signal control and processing module 3.

The signal control and processing module 3 includes: fig. 4 shows a principle of the wireless communication module 311, the signal processor 312, and the display interface module 313. The wireless communication module 311 is a UART serial port to ZigBee wireless module, and can perform ZigBee wireless communication with the laser emission modules 1-1 to 1-14 and the laser reflection modules 2-1 to 2-14, and the UART serial port thereof is connected to the RS-232 interface of the signal processor 312. The signal processor 312 has an external clock interface and a display output interface in addition to the RS-232 interface. The external clock interface is connected with the high-precision time service module 4, and the display output interface is connected with the signal input interface of the display interface module 313. The display interface module 313 converts the display information output by the signal processor 312 into an HDMI output signal with 1920 × 1080 resolution for connecting the data display terminal 5, and the display interface module 313 can also receive a touch signal from the display terminal and transmit the touch signal to the signal processor 312 for human-computer interaction.

The high-precision time service module 4 is an NTP network time server and supports Beidou time service or WIFI time service.

The data display terminal 5 is a 1920 × 1080 resolution liquid crystal display with a touch function, and supports HDMI signal input.

The 14 laser emission modules 1-1 to 1-14 and the 14 laser reflection modules 2-1 and 2-14 are paired into 14 groups of laser measurement units, such as: the laser emitting module 1-1 and the laser reflecting module 2-1 are matched to form a 1 st group of laser measuring units. In any group of laser measuring units, a photoelectric switch of a laser emitting module in the group is coaxial with a reflector of a laser reflecting module and is used for measuring the triggering moment when the laser emitting module is shielded. Such as: the photoelectric switch 111 in the laser emitting module 1-1 in the group 1 laser measuring unit is coaxial with the reflector 211 in the laser reflecting module 2-1, and the photoelectric switch 111 realizes the measurement of the shielded moment through the matching of the photoelectric switch and the reflector. In addition, the laser ranging module 113 in the laser emitting module 1-1 measures the distance between itself and the adjacent laser emitting module 1-2, and the laser ranging module 213 in the laser reflecting module 2-1 measures the distance between itself and the adjacent laser emitting module 2-2.

The high-precision time service module 4 is used for outputting a high-precision stable clock signal.

The signal processor 312 in the signal control and processing module 3 controls the power-on of the photoelectric switches inside the laser emitting modules 1-1 to 1-14 and the distance measuring function of any laser emitting module and the adjacent laser emitting module, and controls the distance measuring function of any laser reflecting module and the adjacent laser reflecting module in the laser reflecting modules 2-1 to 2-14 through the wireless communication module 311.

The signal processor 312 in the signal control and processing module 3 reads the triggering time information when all the photoelectric switches inside the laser emitting modules 1-1 to 1-14 are blocked, the distance information of the adjacent laser emitting modules, and the distance information of the adjacent laser reflecting modules measured by the laser reflecting modules 2-1 to 2-14 through the wireless communication module 311.

The signal processor 312 in the signal control and processing module 3 wirelessly synchronizes clocks of 14 laser emission modules 1-1 to 1-14 through the wireless communication module 311 according to the high-precision and stable clock information output by the high-precision time service module 4, so as to ensure clock synchronization of all the laser emission modules 1-1 to 1-14.

The signal processor 312 in the signal control and processing module 3 calculates the result of the jumping bed action, such as the falling point position and the flying time, according to the shielding time and the distance measuring information of 14 sets of laser measuring units, which are read by the wireless communication module 311, and transmits the result to the data display terminal 5 through the display interface module 313. The data display terminal 5 is used for displaying the trampoline action flight landing position and the flight time.

The 14 groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline from the 1 st group to the 14 th group, the non-uniform arrangement means that the light paths of the laser emitting modules and the laser reflecting modules in each group of laser measuring units are coaxial, the light paths of any two groups of laser measuring units are parallel, the vertical distances between two adjacent groups of laser measuring units are not completely the same, and as shown in fig. 5, the middle is dense, and the two sides are sparse.

The advantages of the non-uniform mounting are: 1. compared with the trampoline action parameter measuring system specified by the international gymnastics association at present, the system adopts the mode that each group of laser measuring units is non-uniformly installed at the bottom of the trampoline, so that the detailed non-uniform rasterization division is carried out on the bottom of the trampoline, and more accurate drop point position information of the interested area is provided for athletes, coaches and judges. 2. The non-uniform installation mode of the system can carry out personalized installation according to the characteristics of the position of the drop point of each athlete, provides personalized information feedback of the position of the drop point for the athlete, improves the accurate holding capacity of the athlete on the position of the drop point, and reduces the risk of sports injury during training. 3. According to the development of the trampoline competitive sports competition rules, the judgment standard of horizontal displacement by trampoline sports is more and more strict, and the trampoline sports are installed in advance in a non-uniform mode that the center is dense and the two sides are sparse in daily training, so that the control capacity of athletes on the horizontal displacement can be enhanced in the daily training, and the technical strength is reserved for the more strict competition rules. 4. In a trampoline area where athletes fall infrequently, the laser measuring units are properly sparse when installed; in the trampoline area where the athlete frequently falls, the laser measuring units are installed appropriately and densely, the measuring resolution and precision of the falling point position and the flight time of the trampoline area where the athlete frequently falls are effectively improved, and meanwhile, the cost is saved.

The laser emission modules 1-1 to 1-14 measure the trigger time when being shielded in the following manner: when no object is on the optical path of the photoelectric switches in the laser emission modules 1-1 to 1-14 and the reflectors of the laser reflection modules 2-1 to 2-14 matched with the photoelectric switches, the photoelectric switches in the laser emission modules 1-1 to 1-14 output high level; when an object appears on the optical path, the internal corresponding photoelectric switch outputs low level. The time when the photoelectric switch changes from high level output to low level is recorded as the triggering time when the photoelectric switch is shielded by the controller in the laser emitting modules 1-1 to 1-14.

When the laser ranging modules in the laser emission modules 1-1 to 1-14 and the laser reflection modules 2-1 to 2-14 measure the distances between the laser emission modules and the adjacent modules, the distances between the laser ranging modules and the adjacent modules are measured by the laser ranging modules through the RS-485 interfaces, and the internal controller reads the distances between the laser ranging modules and the adjacent modules through the RS-485 interfaces.

The method for controlling the distance measurement function between any one of the laser emitting modules 1-1 to 1-14 and the adjacent laser emitting module by the signal processor 312 in the signal control and processing module 3 through the wireless communication module 311 is as follows: the signal processor 312 in the signal control and processing module 3 sends triggering signals with corresponding functions to the laser emitting modules 1-1 to 1-14 and the laser reflecting modules 2-1 to 2-14 through the wireless communication module 311, so as to realize control of different functions of the laser emitting modules 1-1 to 1-14 and the laser ranging modules 2-1 to 2-14.

The method for the signal processor 312 in the signal control and processing module 3 to read the blocked triggering time information, the distance information of the adjacent laser emitting modules, and the distance information of the adjacent laser reflecting modules, measured by the laser reflecting modules 2-1 to 2-14, through the wireless communication module 311 is as follows: the signal processor 312 in the signal control and processing module 3 reads the trigger time and distance data stored in the controllers of the laser emitting modules 1-1 to 1-14 and the laser reflecting modules 2-1 to 2-14 in a polling manner through the wireless communication module 311.

The method for the signal processor 312 in the signal control and processing module 3 to wirelessly synchronize the clocks of the laser emitting modules 1-1 to 1-14 through the wireless communication module 311 according to the high-precision and stable clock information output by the high-precision time service module 4 is as follows: the signal processor 312 in the signal control and processing module 3 synchronizes the clocks of the laser emitting modules 1-1 to 1-14 via the wireless communication module 311 by using the high-precision and stable clock information output by the high-precision time service module 4 and the existing mature clock synchronization protocol, such as the TPSN protocol.

The method for calculating the fall point position and the flight time of the trampoline action by the signal control and processing module 3 comprises the following steps: firstly, the signal processor 312 in the signal control and processing module 3 sequentially reads the distance between the adjacent laser emitting modules measured by the laser emitting modules 1-1 to 1-14 and the distance information between the adjacent laser reflecting modules measured by the laser reflecting modules 2-1 to 2-14 through the wireless communication module 311, and accordingly, the bottom of the trampoline is divided into non-uniform gridding areas. Subsequently, the signal processor 312 in the signal control and processing module 3 detects whether the photoelectric switches in all the laser emitting modules 1-1 to 1-14 are shielded in real time through the wireless communication module 311.

When the athlete is in a falling stage on the trampoline, the athlete from the two feet falling point to other areas of the trampoline can descend along with different degrees, shielding is formed when part of the area of the trampoline surface descends to a coaxial light path of the photoelectric switch in the laser emission module of the corresponding area and a reflecting mirror in the laser reflection module, the output level of the photoelectric switch in the laser emission module in the corresponding area changes, and the controller records the information of the shielded triggering time. Because the laser emission module closest to the drop point position is triggered before other laser emission modules in time, the signal processor 312 in the signal control and processing module 3 can obtain the drop point position of the athlete according to the read triggering time information of the shielded laser emission module.

When the athlete is in the ascending stage on the trampoline, which is completely opposite to the descending stage, the athlete can ascend to different degrees along with time from the two feet falling points to other areas of the trampoline, and when a part of the bed surface area ascends to the position above the coaxial light path of the photoelectric switch in the laser emitting module and the reflecting mirror in the laser reflecting module in the corresponding area, the shielding disappears. When the blocking signals of the photoelectric switches in all the laser emission modules 1-1 to 1-14 disappear, the athlete can be considered to leave the trampoline, the signal processor 312 in the signal control and processing module 3 starts to time at this moment until the level of the photoelectric switch in any one laser emission module changes, the controller stops after recording a new blocking moment, and the time corresponds to the flight time of the athlete in the current action.

The action drop point position and flight time calculation method based on the non-uniform installation mode has the advantages that: 1. the laser measuring unit is installed in a dense area, and the calculation of the action drop point position and the flight time of the area is more accurate than that of an area where the laser measuring unit is installed sparsely. 2. The laser measurement unit is installed in a sparse area, the real-time data volume of the area is smaller than that of an area which is installed densely, the measurement speed of the system is improved, the implementation difficulty of system signal processing and calculation is reduced, and the software and hardware development cost is reduced.

When the signal processor 312 in the signal control and processing module 3 processes the photoelectric switch shielding time recorded by the laser emitting modules 1-1 to 1-14, in order to avoid the recording error of the flight time caused by the oscillation of the trampoline, methods such as a software key jitter elimination algorithm, dead time setting and the like can be adopted, so that the measurement accuracy is improved.

The trampoline action parameter measuring method based on the non-uniform sensor arrangement disclosed in the embodiment is used for the trampoline action parameter measuring system based on the non-uniform sensor arrangement to measure the single-action drop point position and the flight time of an athlete, and the specific implementation steps are as follows, as shown in fig. 6:

the method comprises the following steps: all the laser emitting modules and the laser reflecting modules are installed on the bottom of the trampoline in a non-uniform mode. 14 groups of laser measuring units consisting of the laser emitting modules 1-1 to 1-14 and the laser reflecting modules 2-1 to 2-14 are non-uniformly arranged at the bottom of the trampoline, and the photoelectric switches of the laser emitting modules in each group of laser measuring units are coaxial with the reflecting mirrors of the laser reflecting modules.

The advantages of the non-uniform mounting are: 1. compared with the trampoline action parameter measuring system specified by the international gymnastics association at present, the system adopts the mode that each group of laser measuring units is non-uniformly installed at the bottom of the trampoline, so that the detailed non-uniform rasterization division is carried out on the bottom of the trampoline, and more accurate drop point position information of the interested area is provided for athletes, coaches and judges. 2. The non-uniform installation mode of the system can carry out personalized installation according to the characteristics of the position of the drop point of each athlete, provides personalized information feedback of the position of the drop point for the athlete, improves the accurate holding capacity of the athlete on the position of the drop point, and reduces the risk of sports injury during training. 3. According to the development of the competition rules of the trampoline sports, the judgment standard of horizontal displacement by trampoline sports is more and more strict, and the trampoline sports are installed in a non-uniform mode with dense centers and sparse sides in advance in daily training, so that the control capability of athletes on the horizontal displacement can be enhanced in the daily training, and the trampoline sports are more rigorous in competition rules and technical strength. 4. In a trampoline area where athletes fall infrequently, the laser measuring units are properly sparse when installed; in the trampoline area where the athlete frequently falls, the laser measuring units are installed appropriately and densely, the measuring resolution and precision of the falling point position and the flight time of the trampoline area where the athlete frequently falls are effectively improved, and meanwhile, the cost is saved.

Step two: all modules are connected, powered up and initialized. The laser emitting modules 1-1 to 1-14, the laser reflecting modules 2-1 to 2-14, the high-precision time service module 4, the signal control and processing module 3 and the data display terminal 5 are electrically connected and powered on, after a user clicks the data display terminal 5 to start measurement, the signal processor 312 in the signal control and processing module 3 initializes the power-on parameters of other modules after receiving a start signal through the display interface module 313.

Step three: and carrying out non-uniform gridding area division on the bottom of the trampoline. The signal processor 312 in the signal control and processing module 3 reads the distance between the adjacent laser emitting modules measured by the laser emitting modules 1-1 to 1-14 and the distance information between the adjacent laser reflecting modules measured by the laser reflecting modules 2-1 to 2-14 through the wireless communication module 311, and accordingly performs non-uniform gridding area division on the bottom of the trampoline.

Step four: and all the laser emission modules are synchronized in clock, and relevant parameters and configuration for detecting shielding in real time are initialized. The signal processor 312 in the signal control and processing module 3 synchronizes the clock signals of the laser emitting modules 1-1 to 1-14 in real time through the wireless communication module 311, and initializes the relevant parameters and configurations for detecting whether the photoelectric switches in all the laser emitting modules 1-1 to 1-14 are blocked or not in real time.

Step five: and detecting whether the output level of the photoelectric switches in all the laser emission modules changes or not in real time. The signal processor 312 in the signal control and processing module 3 reads whether the level change occurs in the 1-1 to 1-14 photoelectric switches in all the laser emission modules through the wireless communication module 311 until the level change occurs in the photoelectric switches in any one of the laser emission modules and the trigger time signal recorded by the corresponding controller is read, starts to read the trigger time information recorded by the controllers in other laser emission modules, and determines the area corresponding to the laser emission module which is triggered first, that is, the drop point position of the athlete by judging the trigger time information.

Step six: and detecting whether the photoelectric switches in all the laser emission modules are stably kept in an unshielded state or not in real time. The signal processor 312 in the signal control and processing module 3 reads whether the level change occurs in the photoelectric switches in all the laser emitting modules 1-1 to 1-14 through the wireless communication module 311 until the level change does not occur in the photoelectric switches in all the laser emitting modules 1-1 to 1-14 any more and the output levels of all the photoelectric switches are in an unshielded state, and records the current time as the initial time when the athlete leaves the trampoline and enters the air action stage.

Step seven: and detecting whether the photoelectric switches in all the laser emission modules have level changes which are shielded again in real time. The signal processor 312 in the signal control and processing module 3 reads whether the level change blocked by the photoelectric switches in all the laser emitting modules 1-1 to 1-14 is generated again through the wireless communication module 311 until a level change signal blocked by the photoelectric switch in any one of the laser emitting modules is generated again is read, and records the triggering time information recorded by the corresponding controller as the stopping time when the athlete falls on the trampoline to finish the action stage in the air. And calculating the air flight time of the athlete according to the initial time information recorded in the S6.

The action drop point position and flight time calculation method based on the non-uniform installation mode has the advantages that: 1. the laser measuring unit is installed in a dense area, and the calculation of the action drop point position and the flight time of the area is more accurate than that of an area where the laser measuring unit is installed sparsely. 2. The laser measurement unit is installed in a sparse area, the real-time data volume of the area is smaller than that of an area which is installed densely, the measurement speed of the system is improved, the implementation difficulty of system signal processing and calculation is reduced, and the software and hardware development cost is reduced.

Step eight: and transmitting and displaying the position of the wheel landing point and the flight time data. The signal processor 312 in the signal control and processing module 3 sends the calculated landing point position and the air flight time to the data display terminal 5 through the display interface module 313, and the data display terminal 5 displays related data to a user in a visualized manner.

And then, the measurement of the position of the dropping point and the flight time of the motion of the athlete's own wheel is completed.

Step nine: and circularly finishing M rounds of motion parameter measurement. And (5) circulating the step five to the step eight M times, and then completing the measurement of the position of the M-wheel action landing point and the flight time of the athlete.

The above detailed description is intended to illustrate the objects, aspects and advantages of the present invention, and it should be understood that the above detailed description is only exemplary of the present invention and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (8)

1. The utility model provides a trampoline action parameter measurement system based on inhomogeneous sensor arranges which characterized in that: the system comprises a plurality of laser emitting modules, a plurality of laser reflecting modules, a high-precision time service module, a signal control and processing module and a data display terminal; the N laser emitting modules and the N laser reflecting modules are respectively in wireless connection with the signal control and processing module, and the high-precision time service module is in wired connection with the signal control and processing module; the signal control and processing module is wirelessly connected with the data display terminal;

the N laser emission modules and the N laser reflection modules are paired one by one to form N groups of laser measurement units, namely the laser emission modules and the laser reflection modules are matched one by one to work; the N groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline, and a photoelectric switch of a laser emitting module in each group of laser measuring units is coaxial with a reflector of a laser reflecting module; in any group of laser measuring units, an internal photoelectric switch of a laser emitting module is used for matching with a reflector in a laser reflecting module matched with the photoelectric switch, measuring the triggering time when the photoelectric switch is shielded, and simultaneously, an internal distance measuring circuit measures the distance between the photoelectric switch and the adjacent laser emitting module; the reflector in the paired laser reflection module is used for assisting the measurement of the shielding time of the photoelectric switch of the paired laser emission module, and the internal distance measurement circuit measures the distance between the reflector and the adjacent laser reflection module; the high-precision time service module provides high-precision stable clock signals for the signal control and processing module and all the laser emission modules, and is used for time identification and duration calculation in the motion parameter measuring process of athletes; the signal control and processing module is used for controlling the electrification of photoelectric switches of all laser emitting modules, controlling the distance measuring function of any laser emitting module and an adjacent laser emitting module, controlling the distance measuring function of any laser reflecting module and the adjacent laser reflecting module, reading the shielded triggering time information of any laser emitting module, the distance information of the adjacent laser emitting module and the distance information of the laser emitting module and the adjacent laser reflecting module measured by any laser reflecting module, wirelessly synchronizing the clock of each laser emitting module according to high-precision stable clock information output by the high-precision time service module, simultaneously calculating the falling point position and the flight time result of the trampoline action, and wirelessly transmitting the result to the data display terminal; the data display terminal is used for receiving the information of the signal control and processing module and displaying the position of a jumping bed action flight drop point and the flight time;

the N groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline; the non-uniform installation means that the light paths of the laser emission module and the laser reflection module in each group of laser measurement units are coaxial, the light paths of any two groups of laser measurement units are parallel, and the vertical distances between two adjacent groups of laser measurement units are not completely the same.

2. A system for measuring parameters of trampoline activity based on a non-uniform sensor arrangement as claimed in claim 1, wherein: the mode that each group of laser measurement units are non-uniformly installed at the bottom of the trampoline is adopted, more detailed non-uniform grid division is carried out on the bottom of the trampoline, and more accurate falling point position information of an interested area is provided for athletes, coaches and judges;

by adopting the mode that each group of laser measuring units is non-uniformly installed at the bottom of the trampoline, the individual installation can be carried out according to the characteristics of the position of the drop point of each athlete, the individual feedback of the information of the position of the drop point is provided for the athlete, the accurate holding capacity of the athlete on the position of the drop point is improved, and the risk of sports injury during training is reduced;

the judgment standard of the trampoline movement on the horizontal displacement is more and more strict, the trampoline movement is installed in advance in a non-uniform mode that the center is dense and the two sides are sparse in daily training, the control capability of athletes on the horizontal displacement can be enhanced in the daily training, and the technical strength is reserved for more severe competition rules;

in a trampoline area where athletes fall infrequently, the laser measuring units are properly sparse when installed; in the trampoline area where the athlete frequently falls, the laser measuring units are installed appropriately and densely, the measuring resolution and precision of the falling point position and the flight time of the trampoline area where the athlete frequently falls are effectively improved, and meanwhile, the cost is saved.

3. A system for measuring parameters of trampoline actions based on a non-uniform sensor arrangement as claimed in claim 2, wherein: the method for measuring the triggering moment when the laser emission module is shielded comprises the following steps: when no object is on the optical path of the photoelectric switch of the laser emission module and the reflector of the laser reflection module matched with the photoelectric switch, the photoelectric switch in the laser emission module outputs high level; when an object appears on the optical path, the internal photoelectric switch outputs a low level; the time when the photoelectric switch changes from high level output to low level is the trigger time when the photoelectric switch is blocked.

4. A system for measuring parameters of trampoline actions based on a non-uniform sensor arrangement as claimed in claim 3, wherein: when the distance between the laser emitting module and the adjacent module is measured by the distance measuring circuit in the laser emitting module and the laser reflecting module, the laser distance measuring technology based on the flight time method is adopted to realize: the signal processing circuit in the two types of modules identifies the time of the signals of the laser output and the laser received by the ranging circuit, generates timing starting time and timing ending time, and further calculates to obtain distance information according to the flight time ranging principle.

5. A system for measuring parameters of trampoline actions based on a non-uniform sensor arrangement as claimed in claim 4, wherein: the signal control and processing module controls the photoelectric switch of the laser emission module to be powered on, the signal control and processing module controls the distance measurement function of any laser emission module and the adjacent laser emission module, and the method for controlling the distance measurement function of any laser reflection module and the adjacent laser reflection module by the signal control and processing module comprises the following steps: and a signal processor in the signal control and processing module sends corresponding trigger signals to the laser emission module and the laser reflection module through a wireless communication circuit, so that different functions in the laser emission module and the laser reflection module are controlled.

6. A system for measuring parameters of trampoline actions based on a non-uniform sensor arrangement as claimed in claim 5, wherein: the method for reading the triggering time information when the laser emitting modules are shielded, the distance information of the adjacent laser emitting modules and the distance information between the laser reflecting modules and the adjacent laser reflecting modules, which are measured by the signal control and processing module, is as follows: a signal processor in the signal control and processing module reads the measurement data of the laser emitting module and the laser reflecting module through a wireless communication circuit in a polling mode;

the method for the signal control and processing module to wirelessly synchronize the clocks of the laser emission modules according to the high-precision and stable clock information output by the high-precision time service module comprises the following steps: a signal processor in the signal control and processing module synchronizes clocks of all laser emission modules through a wireless communication circuit by utilizing high-precision and stable clock information output by the high-precision time service module and the existing mature clock synchronization protocol;

the method for calculating the drop point position and the flight time of the trampoline action by the signal control and processing module comprises the following steps: firstly, reading the distance between adjacent laser emission modules measured by each laser emission module and the distance information between adjacent laser reflection modules measured by each laser reflection module by a signal control and processing module, and carrying out non-uniform gridding area division on the bottom of the trampoline according to the distance information; then, the signal control and processing module detects whether photoelectric switches in all the laser emitting modules are shielded or not in real time; when an athlete is in a falling stage on the trampoline, the athlete can descend from the two feet falling points to other areas of the trampoline to different degrees along with time, shielding is formed when a part of bed surface area descends to a coaxial light path of a photoelectric switch in the laser emission module of the corresponding area and a reflector in the laser reflection module, and the laser emission module in the corresponding area is triggered to obtain the shielded triggering time information; because the laser emitting module closest to the drop point position is triggered before other laser emitting modules in time, the signal control and processing module can obtain the drop point position of the athlete according to the read trigger moment information that the laser emitting module is blocked; when the athlete is in the ascending stage on the trampoline, which is completely opposite to the descending stage, the athlete can ascend to different degrees along with time from the feet falling point to other areas of the trampoline, and when a part of bed surface area ascends to the position above the coaxial light path of the photoelectric switch in the laser emission module and the reflecting mirror in the laser reflection module in the corresponding area, the shielding disappears; when the shielding signals of all the laser emission modules disappear, the athlete is judged to leave the trampoline, the signal control and processing module starts timing at the moment, and the timing is stopped when any one laser emission module is triggered, and the time corresponds to the flight time of the athlete in the current action.

7. A system for measuring parameters of trampoline actions based on a non-uniform sensor arrangement as claimed in claim 6, wherein: the action drop point position and flight time calculation method based on the non-uniform installation mode has the advantages that: the laser measuring unit is installed in a dense area, and the calculation of the action drop point position and the flight time of the area is more accurate than that of an area with sparse installation; the laser measuring unit is installed in a sparse area, the real-time data volume of the area is smaller than that of an area with dense installation, the measuring speed of the system is improved, the implementation difficulty of system signal processing and calculation is reduced, and the software and hardware development cost is reduced.

8. A method for measuring trampoline action parameters based on a non-uniform sensor arrangement, which is implemented based on the trampoline action parameter measuring system based on the non-uniform sensor arrangement as claimed in claim 1, 2, 3, 4, 5, 6 or 7, and is characterized in that: the method comprises the following steps:

the method comprises the following steps: a plurality of groups of laser measuring units are non-uniformly arranged at the bottom of the trampoline, and a photoelectric switch of a laser emitting module in each group of laser measuring units is coaxial with a reflector of a laser reflecting module;

the advantages of the non-uniform mounting are: the mode that each group of laser measuring units are non-uniformly installed at the bottom of the trampoline is adopted, more detailed non-uniform rasterization division is carried out on the bottom of the trampoline, and more accurate drop point position information of an interested area is provided for athletes, coaches and judges; according to the characteristics of the drop point position of each athlete, personalized non-uniform installation is carried out, personalized drop point position information feedback is provided for the athlete, the accurate holding capacity of the athlete on the drop point position is improved, and the risk of sport injury during training is reduced; the judgment standard of the trampoline movement on the horizontal displacement is more and more strict, the trampoline movement is installed in advance in a non-uniform mode that the center is dense and the two sides are sparse in daily training, the control capability of athletes on the horizontal displacement can be enhanced in the daily training, and the technical strength is reserved for more severe competition rules; in a trampoline area where athletes fall infrequently, the laser measuring units are properly sparse when installed; in a trampoline area where athletes frequently fall, laser measurement units are installed appropriately and densely, so that the measurement resolution and precision of the falling point position and the flight time of the trampoline area where athletes frequently fall are effectively improved, and meanwhile, the cost is saved;

step two: the laser emitting module, the laser reflecting module, the high-precision time service module and the signal control and processing module are electrically connected with the data display terminal and powered on, and after a user clicks the data display terminal to start measurement, the signal control and processing module initializes other modules after receiving a key signal;

step three: the signal control and processing module reads the distance between the adjacent laser emitting modules measured by each laser emitting module and the distance information between the adjacent laser reflecting modules measured by each laser reflecting module, and the bottom of the trampoline is divided into non-uniform gridding areas according to the distance information;

step four: the signal control and processing module synchronizes clock signals of all the laser emission modules in real time and initializes and detects related parameters and configuration of whether all the laser emission modules are shielded or not in real time;

step five: when the signal control and processing module reads a trigger time signal generated by any one laser emission module, starting to record the trigger time information of each laser emission module; wherein, the area corresponding to the laser emission module triggered firstly is the drop point position of the athlete;

step six: when the signal control and processing module reads that all the laser emission modules do not generate the shielded trigger signals any more, recording the trigger moment information generated by the laser emission modules as the initial moment when the athlete leaves the trampoline and enters the action stage in the air;

step seven: when the signal control and processing module reads that any laser emission module generates a shielded trigger signal, recording the generated trigger time information as the stop time of the athlete falling on the trampoline to finish the action stage in the air; calculating the air flight time of the athlete according to the initial moment information recorded in the step six;

the action drop point position and flight time calculation method based on the non-uniform installation mode has the advantages that: the laser measuring unit is installed in a dense area, and the calculation of the action drop point position and the flight time of the area is more accurate than that of an area with sparse installation; the laser measurement unit is installed in a sparse area, and the real-time data volume of the area is smaller than that of an area with dense installation, so that the measurement speed of the system is improved, the difficulty in realizing signal processing and calculation of the system is reduced, and the development cost of software and hardware is reduced;

step eight: the signal control and processing module sends the calculated position of the drop point and the air flight time to a data display terminal, and the data display terminal displays related data to a user in a visual mode;

so far, the measurement of the position of the dropping point and the flight time of the motion of the athlete's own wheel is completed;

step nine: and (5) circulating the step five to the step eight M times, namely measuring the position of the falling point and the flight time of the M-wheel action of the athlete.

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