TWI717078B - Speed measuring system for moving sphere - Google Patents

Abstract

The present invention provides a speed measuring system for a moving sphere, including asphere and a wearable device.The sphere is provided with a radio-frequency transmitter unit.The wearable device is provided with a processing unit and a radio-frequency reader unit coupled to the processing unit. The wearable device is configured to receive the RF signal transmitted by the radio-frequency transmitter unit through the radio-frequency reader unit, and calculate the speed of the sphere according to the time difference between the received RF signalsthrough the processing unit.

Description

Ball speed measurement system

The invention relates to a speed measurement system, in particular to a sphere speed measurement system.

At present, in ball sports, most of the ball's motion trajectory is captured by a high-speed camera to analyze the ball speed, or the ball speed of the ball is detected by a laser speed gun, or by a precision set inside the ball Speed measuring IC and related electronic components.

However, high-speed cameras are not affordable for ordinary people. The laser speed gun is expensive, and the radar speed gun emits laser light to irradiate moving objects. When the moving object is small and the moving speed is high, the target is difficult to capture and the speed measurement fails. In addition, the precision speed IC and related electronic components are installed inside the ball, which not only greatly increases the cost of the ball, but also the precision speed IC and related electronic components are easily damaged by impact.

In view of this, the present inventor has been engaged in the development and design of related products for many years, and feels that the above-mentioned shortcomings can be improved. With great concentration of research and the application of scientific theory, we finally propose an invention with reasonable design and effective improvement of the above-mentioned shortcomings.

The purpose of the present invention is to provide a ball speed measurement system in view of the shortcomings of the prior art.

One of the technical solutions adopted by the present invention is to provide a sphere speed measurement system, including: a sphere, the sphere is provided with a radio frequency transmitting unit; and a signal transceiver, the signal transceiver is provided with a processing unit and a coupling A radio frequency reading unit connected to the processing unit; wherein the signal transceiving device is used to read the radio frequency signal emitted by the radio frequency transmitting unit through the radio frequency reading unit, and to pass through the The processing unit calculates the ball speed of the sphere according to the time difference of the radio frequency signal read each time.

In a preferred embodiment, the signal transceiver device includes a handheld device and a field device, the field device can communicate with the handheld device, the handheld device is provided with a display unit, and the field device is provided with a wireless Transmission unit, the processing unit, and the wireless radio frequency reading unit, and the wireless transmission unit is coupled to the processing unit, and the venue device is used to read the wireless radio frequency through the radio frequency reading unit The radio frequency signal transmitted by the radio frequency transmitting unit is used to calculate the ball speed of the sphere according to the time difference of the radio frequency signal read each time through the processing unit, and is used to calculate the ball speed through the wireless transmission unit It is transmitted to the display unit of the handheld device for display.

In a preferred embodiment, the signal transceiving device is a wearable device, the signal transceiving device is further provided with a display unit, and the signal transceiving device is further configured to display the calculated ball speed through the display unit.

In a preferred embodiment, the signal transceiving device is a handheld device, the signal transceiving device is further provided with a display unit, and the signal transceiving device is further configured to display the calculated ball speed through the display unit.

In a preferred embodiment, the radio frequency transmitting unit is an RFID tag that can transmit radio frequency signals to the outside in the form of electric waves, and the frequency of the transmitted radio frequency signals is one of 135Khz, 13.56Mhz, and 920Mhz.

In a preferred embodiment, the RFID tag is an electronic tag with a non-directional antenna.

In a preferred embodiment, the sphere is further provided with a first radio frequency transmitting unit and a second radio frequency transmitting unit, and the frequency of the first radio frequency signal transmitted by the first radio frequency transmitting unit is the same as that of the first radio frequency signal. The frequency of the second radio frequency signal transmitted by the two radio frequency transmitting units is different, and the signal transceiver device is further used for reading the first radio frequency signal transmitted by the first radio frequency transmitting unit through the radio frequency reading unit and The second wireless radio frequency signal transmitted by the second radio frequency transmitting unit, and the signal transceiver device is further used for using the processing unit according to the first radio frequency signal and the second radio frequency signal read each time. The time difference of the radio frequency signal is used to calculate the rotation speed of the sphere.

In a preferred embodiment, the first radio frequency transmitting unit and the second radio frequency transmitting unit are a first RFID tag and a second RFID tag, respectively, and the first RFID tag and the second RFID tag are The RFID tags are arranged opposite to each other.

In a preferred embodiment, the first RFID tag and the second RFID tag are respectively an electronic tag with a directional antenna.

In a preferred embodiment, the first radio frequency transmitting unit and the second radio frequency transmitting unit are a first RFID tag and a second RFID tag, respectively, and the first RFID tag and the second RFID tag The tags are respectively an electronic tag with a directional antenna, and the first RFID tag and the second RFID tag are arranged at a vertical angle.

In a preferred embodiment, the signal transceiving device is further configured to calculate the change of the acceleration of the sphere according to the time difference of the radio frequency signal read each time through the processing unit, and according to the calculated change of the sphere The change of the rotation speed and acceleration of the sphere determines the weight of the sphere.

In a preferred embodiment, the sphere is further provided with a vibration switch, and the vibration switch is coupled to the radio frequency transmitting unit, the first radio frequency transmitting unit, and the second radio frequency transmitting unit. The vibration switch is configured to turn on the radio frequency transmitting unit, the first radio frequency transmitting unit, and the second radio frequency transmitting unit when the ball is sensed vibration, and the radio frequency transmitting unit is not sensed after a preset period of time. When the sphere vibrates, the radio frequency transmitting unit, the first radio frequency transmitting unit and the second radio frequency transmitting unit are turned off.

In a preferred embodiment, the sphere is further provided with a first radio frequency transmitting unit and a second radio frequency transmitting unit, and the frequency of the first radio frequency signal transmitted by the first radio frequency transmitting unit is the same as that of the first radio frequency signal. The frequency of the second radio frequency signal transmitted by the two radio frequency transmitting units is different, and the signal transceiver device is further used for reading the first radio frequency signal transmitted by the first radio frequency transmitting unit through the radio frequency reading unit and The second radio frequency signal transmitted by the second radio frequency transmitting unit, and the signal transceiving device is further configured to use the processing unit to sequentially read the first radio frequency signal each time the radio frequency reading unit When a radio frequency signal and the second radio frequency signal are activated, the counting circuit in the processing unit is started to count, and the rotation speed of the sphere is calculated according to the counting result.

In a preferred embodiment, the sphere is further covered with a skin, and the skin forms at least one seam gap and a plurality of seam holes located on both sides of the at least one seam gap.

In a preferred embodiment, the radio frequency transmitting unit is arranged between the skin and the sphere.

In a preferred embodiment, the system further includes at least two of the signal transceiving devices, a plurality of the signal transceiving devices are electrically connected to each other and arranged at intervals, and are respectively used to read the wireless signals transmitted by the radio frequency transmitting unit. The radio frequency signal is used to obtain the movement track of the sphere according to the time difference of the radio frequency signal read by each of the signal transceiver devices through the processing unit.

The beneficial effects of the present invention are at least that in the sphere speed measurement system provided by the present invention, a wireless radio frequency transmitting unit is arranged in the sphere, a radio frequency reading unit is arranged in the signal transceiving device, and the signal transceiving device reads through the radio frequency reading unit The radio frequency signal transmitted by the radio frequency transmitting unit is used to calculate the speed of the sphere according to the time difference of the radio frequency signal read each time through the processing unit. Thus, the present invention provides a low-cost, highly reliable and convenient sphere speed measurement system.

In order to further understand the features and technical content of the present invention, please refer to the following detailed description and drawings about the present invention. However, the provided drawings are only for reference and description, and are not used to limit the present invention.

The following is a specific example to illustrate the implementation of the "sphere speed measurement system" disclosed in this creation. Those familiar with this technique can easily understand the advantages and effects of this creation from the content disclosed in this manual. This creation can be implemented or applied through other different specific embodiments, and various details in this specification can also be based on different viewpoints and applications, and various modifications and changes can be made without departing from the spirit of this creation. The "coupling" mentioned in the full text of the present invention includes direct connection and indirect connection. It can also refer to two units or devices through wired entities, wireless media, or a combination thereof, so that the two units or devices can transmit data to each other It is understood by those with ordinary knowledge in the technical field to which the present invention belongs. In addition, the drawings of this creation are only schematic illustrations, and are not based on actual size depictions.

Please refer to FIGS. 1 to 3, an embodiment of the present invention provides a sphere speed measurement system, which basically includes a sphere 10 and a signal transceiver device 20.

The sphere 10 can be designed to have a diameter similar to that of a traditional hard baseball or softball. At the same time, by selecting the material of the sphere 10, the sphere 10 has a weight and elasticity similar to the inner sphere of a traditional hard baseball or softball.

The sphere 10 is provided with a radio frequency transmitting unit for transmitting radio frequency signals. Furthermore, the radio frequency transmitting unit may be an RFID (Radio Frequency Identification) tag 11, and the RFID tag 11 may be an active RFID tag or a passive RFID tag. In this embodiment, the RFID tag 11 can be an active RFID tag, and the sensing distance can be relatively far, up to 100 meters. Moreover, the RFID tag 11 can transmit radio frequency signals to the outside in the form of electric waves, and the frequency of the transmitted radio frequency signals can be 135Khz, 13.56Mhz, 920Mhz. In practice, the RFID tag 11 is composed of an antenna and a microchip. In this embodiment, the RFID tag 11 is a non-directional electronic tag, that is, the RFID tag 11 is an electronic tag with a non-directional antenna. Of course, the aspect of the RFID tag 11 is not limited to that shown in FIG. 1, and can be changed according to needs.

In this embodiment, the signal transceiving device 20 is a wearable device, which can be worn on the user's limbs, such as the wrists, knee joints, etc., in a sleeved manner. Moreover, the signal transceiver device 20 is provided with a processing unit 21 and a radio frequency reading unit 22 coupled to the processing unit 21, and the radio frequency reading unit 22 may be an RFID tag reading unit.

Further, the signal transceiving device 20 can be provided with an adjusting member 201 that can be wound around the user's limbs, for example, a flexible belt body, each of which is provided with a buckling structure 2011 that can be relatively combined or separated. The buckling structure 2011 can be Yes but not limited to Velcro. The adjusting member 201 may also be an elastic adjusting ring belt to be bound to the user's limbs through elasticity. The signal transceiving device 20 can be worn on the body of a catcher or a coach without limitation. In addition, the number of signal transceiver devices 20 is not limited. In other embodiments, the signal transceiving device 20 may also be a handheld device provided with an RFID reader.

The signal transceiving device 20 is used for reading the radio frequency signal emitted by the RFID tag 11 through the radio frequency reading unit 22, and for calculating the speed of the sphere 10 according to the time difference of the radio frequency signal read each time through the processing unit 21. In this embodiment, the signal transceiving device 20 is provided with a display unit 23 coupled to the processing unit 21, and the signal transceiving device 20 is used to display the calculated ball speed through the display unit 23.

Furthermore, the radio wave velocity c of the radio frequency signal emitted by the RFID tag 11 is equal to the frequency f multiplied by the wavelength λ, and the sphere 10 quickly approaches the signal transceiver 20 when flying, so that the signal transceiver 20 reads each time The shorter the time of the radio waves emitted by the RFID tag 11 is, so that the signal transceiver 20 can calculate the speed of the sphere 10 according to the time difference of the radio waves read each time.

In addition, the signal transceiver device 20 can also actively transmit an electric wave to the RFID tag 11 through the radio frequency reading unit 22, and obtain the distance change between the signal transceiver device 20 and the RFID tag 11 according to the time difference between each echo being read. Thus, the velocity of the sphere 10 is calculated.

As a preferred solution, please refer to FIG. 4, the signal transceiver device 20 may include a handheld device 20a and a field device 20b. The handheld device 20a is, for example, a mobile phone or a tablet, but not limited thereto. The field device 20b may be set at a suitable position of the field, for example, and is provided with a processing unit 21, a radio frequency reading unit 22, and a wireless transmission unit 24. The wireless radio frequency reading unit 22 and the wireless transmission unit 24 are respectively coupled to the processing unit 21. The radio frequency reading unit 22 may be an RFID tag reading unit, and the wireless transmission unit 24 may be a Bluetooth transmission unit. The field device 20b can actively transmit an electric wave to the RFID tag 11 through the radio frequency reading unit 22, and according to the time difference between each echo read, obtain the distance change between the field device 20b and the RFID tag 11, thereby calculating the sphere 10 The calculated speed of the sphere can be transmitted to the display unit 23 of the handheld device 20a for display through the wireless transmission unit 24.

As a preferred solution, please refer to FIG. 5. As shown in FIG. 5, the sphere 10 is composed of a spherical center 101 and at least one elastic layer. The elastic layer includes a first elastic layer 102 and a second elastic layer 103, and The first elastic layer 102 and the second elastic layer 103 concentrically wrap the spherical core 101 to form the sphere 10, and the RFID tag 11 is embedded in the spherical core 101. In addition, the first elastic layer 102 and the second elastic layer 103 can be made of materials with different elastic coefficients and specific gravities. Therefore, through the combination of elastic layers with different elastic coefficients and different specific gravities, a weight similar to that of a traditional hard baseball or softball can be obtained. And flexibility. Of course, the number of elastic layers is not limited to that disclosed in the embodiment shown in FIG. 5, and any number of elastic layers can be used in combination.

As a preferred solution, please refer to FIG. 6. The sphere 10 is further covered with a skin 30. The skin 30 can be wrapped on the surface of the sphere 10 as shown in FIG. 1 to form a state as shown in FIG. 6. Furthermore, the skin 20 is formed with at least one suture slit 31 and a plurality of suture holes 32 located on both sides of the suture slit 31. Thereby, the sphere 10 has a more similar feel to the traditional hard baseball or softball.

As a preferred solution, please refer to FIG. 7. The RFID tag 11 is attached under the skin 30, that is, between the sphere 10 and the skin 30. Thereby, all the physical characteristics of traditional hard baseball or softball can be retained, and the requirements for processing convenience can be met.

For traditional hard baseball or softball, in addition to ball speed, rotational speed is also an important indicator, because at the same ball speed, different rotational speeds can produce differences in the trajectory of the base. Rotation speed refers to the number of revolutions of the sphere during flight.

Therefore, in order to obtain the ball speed and rotation speed of the sphere, as a preferred solution, please refer to Figures 8 and 10 again. The sphere 10 is not only provided with a radio frequency transmitting unit (RFID tag 11), but also provided with a first radio frequency transmitting unit. And a second radio frequency transmitting unit. In this embodiment, the first radio frequency transmitting unit and the second radio frequency transmitting unit may be the first RFID tag 12 and the second RFID tag 13 respectively, and the first RFID tag 12 and the second RFID tag 13 are arranged oppositely. In a modified embodiment, as shown in FIG. 9, the first RFID tag 12 and the second RFID tag 13 are arranged at a vertical angle. Of course, the aspects of the first RFID tag 12 and the second RFID tag 13 are not limited to those shown in FIGS. 8 and 9 and can be changed as needed.

In addition, the frequency of the first radio frequency signal emitted by the first RFID tag 12 is different from the frequency of the second radio frequency signal emitted by the second RFID tag 13.

Furthermore, the first RFID tag 12 and the second RFID tag 13 are directional electronic tags, that is, the first RFID tag 12 and the second RFID tag 13 are respectively an electronic tag with a directional antenna.

In the case where the first RFID tag 12 and the second RFID tag 13 have directivity, during the rotation of the sphere 10 (as shown in FIG. 10), the radio frequency reading unit 22 of the signal transceiver 20 will sequentially read The first radio frequency signal emitted by the first RFID tag 12 and the second radio frequency signal emitted by the second RFID tag 13, and the processing unit 21 of the signal transceiver 20 can read the first radio frequency signal and the second radio frequency signal each time. 2. Calculate the rotation speed of the sphere 10 by the time difference of the radio frequency signal.

For example, the smaller the time difference between the first wireless signal and the second wireless signal read, the faster the rotation speed, and the larger the time difference between the first wireless signal and the second wireless signal read, the slower the rotation speed .

In addition, the processing unit 21 of the signal transceiving device 20 can be further configured to activate the counting circuit in the processing unit 21 every time the radio frequency reading unit 22 sequentially reads the first radio frequency signal and the second radio frequency signal. The counting function is used to count the times and calculate the rotation speed of the sphere 10 according to the counting result.

For example, the distance from the pitcher mound to the home plate is about 18 meters. A typical curve ball speed is about 110 kilometers per hour. If the revolutions per minute (RPM) of the ball 10 is 1800 rpm, it will be at this distance. The inside will rotate approximately 17 times. Therefore, if the number of counting times is 17, the rotation speed of the ball 10 is 1800 revolutions per minute.

For traditional hard baseball or softball, in addition to ball speed (SPEED) and rotation speed (SPIN), ball quality (STUFF) is also a reference indicator, because the lower the rotation speed, the faster the acceleration, and the ball will feel particularly heavy when hit. Therefore, in order to determine the weight of the sphere 10, the signal transceiver device 20 is further used to calculate the change in the acceleration of the sphere according to the acceleration formula according to the time difference of the radio frequency signal read each time through the processing unit 21, and according to the calculation The rotation speed of the sphere and the change in acceleration can be used to judge the weight of the sphere.

As a preferred solution, please refer to FIG. 11 again. The ball 10 is further provided with a vibration switch 14, and the vibration switch 14 is coupled to the RFID tag 11, the first RFID tag 12 and the second RFID tag 13. In addition, the vibration switch 14 is configured to activate the RFID tag 11, the first RFID tag 12, and the second RFID tag 13 when the sphere 10 is sensed to vibrate, and to turn off the RFID tag 11 when the sphere 10 is not sensed to vibrate after a preset period of time. The first RFID tag 12 and the second RFID tag 13. In this way, the effect of power saving can be achieved.

As a preferred solution, please refer to FIG. 12 again, and in conjunction with FIGS. 3 and 4, the system further includes at least two signal transceiver devices 20. In this embodiment, the number of signal transceiving devices 20 is three as an example, but it is not limited. The three signal transceiving devices 20 are electrically connected to each other and arranged at intervals, and arranged in a straight line. The processing unit 21 can obtain the moving track of the sphere 10 according to the time difference of the radio frequency signals read by each signal transceiving device 20. In other embodiments, as shown in FIG. 13, the three signal transceiving devices 20 are arranged in a triangle, and the processing unit 21 can obtain the moving track of the sphere 10 according to the time difference of the radio frequency signals read by each signal transceiving device 20. In addition, the processing unit 21 can be provided in the field device 20b or the handheld device 20a, and is not limited.

In summary, in the sphere speed measurement system provided by the embodiment of the present invention, a wireless radio frequency transmitting unit is arranged in the sphere, a radio frequency reading unit is arranged in the signal transceiving device, and the signal transceiving device is read through the radio frequency reading unit The radio frequency signal transmitted by the radio frequency transmitting unit is used to calculate the speed of the sphere according to the time difference of the radio frequency signal read each time through the processing unit. In addition, in the sphere speed measurement system provided by the embodiment of the present invention, a first radio frequency transmitting unit and a second radio frequency transmitting unit are also arranged in the sphere, and the frequency of the first radio frequency signal transmitted by the first radio frequency transmitting unit Different from the frequency of the second radio frequency signal transmitted by the second radio frequency transmitting unit, the signal transceiver device calculates the rotation speed of the sphere through the time difference between the first radio frequency signal and the second radio frequency signal read each time, or can be transmitted through Each time the first radio frequency signal and the second radio frequency signal are read in sequence, the counting function is activated to count the times, and the rotation speed of the sphere is calculated according to the counting result. Thus, the present invention provides a low-cost, highly reliable and convenient sphere speed measurement system.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of patent protection of the present invention. Therefore, all equivalent changes made by using the description and schematic contents of the present invention are included in the protection of the rights of the present invention. Within the scope, together to Chen Ming.

10: Sphere 101: Ball Heart 102: The first elastic layer 103: second elastic layer 11: RFID tag 12: The first RFID tag 13: The second RFID tag 14: Vibration switch 20: Signal transceiver 201: adjustment piece 2011: Fastening structure 20a: Handheld device 20b: Field installation 21: processing unit 22: Radio frequency reading unit 23: display unit 24: wireless transmission unit 30: Skin 31: Suture gap 32: Suture hole

Fig. 1 is a schematic diagram of the sphere of the sphere speed measurement system of the present invention.

2 is a schematic diagram of the signal transceiver device of the sphere speed measurement system of the present invention.

Figure 3 is a functional block diagram of the sphere speed measurement system of the present invention.

Figure 4 is another functional block diagram of the sphere speed measurement system of the present invention.

Fig. 5 is another schematic diagram of the sphere of the sphere speed measurement system of the present invention.

Fig. 6 is another schematic diagram of the sphere of the sphere speed measurement system of the present invention.

FIG. 7 is another schematic diagram of the sphere of the sphere speed measurement system of the present invention.

FIG. 8 is a schematic diagram of the first RFID tag and the second RFID tag of the sphere speed measurement system of the present invention being arranged oppositely.

9 is a schematic diagram of the first RFID tag and the second RFID tag of the sphere speed measurement system of the present invention being arranged at a vertical angle.

Fig. 10 is a schematic diagram of the action of the sphere of the sphere speed measurement system of the present invention.

FIG. 11 is a schematic diagram of the vibration switch of the ball speed measurement system of the present invention.

FIG. 12 is a schematic diagram of the signal receiving and transmitting devices of the sphere speed measuring system of the present invention are arranged in a straight line.

FIG. 13 is a schematic diagram of the signal receiving and transmitting devices of the sphere speed measurement system of the present invention in a triangular arrangement.

10: Sphere

11: RFID tag

20: Signal transceiver

21: processing unit

22: Radio frequency reading unit

23: display unit

Claims (13)

A sphere speed measurement system, comprising: a sphere, the sphere is provided with a radio frequency transmitting unit; and a signal transceiving device, the signal transceiving device is provided with a processing unit and a radio frequency reading unit coupled to the processing unit Wherein, the signal transceiving device is used to read the radio frequency signal transmitted by the radio frequency transmitting unit through the radio frequency reading unit, and is used to read the radio frequency signal through the processing unit according to each read Calculate the ball speed of the sphere; wherein the sphere is further provided with a first radio frequency transmission unit and a second radio frequency transmission unit, and the first radio frequency signal transmitted by the first radio frequency transmission unit The frequency is different from the frequency of the second radio frequency signal transmitted by the second radio frequency transmitting unit. The signal transceiving device is further used for reading the first radio frequency signal transmitted by the first radio frequency transmitting unit through the radio frequency reading unit. A radio frequency signal and a second radio frequency signal transmitted by the second radio frequency transmitting unit, and the signal transceiver device is further used for the processing unit according to the first radio frequency signal read each time and The time difference of the second radio frequency signal is used to calculate the rotation speed of the sphere. The sphere speed measurement system according to the first item of the patent application, wherein the signal transceiving device includes a handheld device and a field device, the field device can communicate with the handheld device, and the handheld device is provided with a display Unit, the venue device is provided with a wireless transmission unit, the processing unit, and the wireless radio frequency reading unit, and the wireless transmission unit is coupled to the processing unit, and the venue device is used to transmit the wireless The radio frequency reading unit reads the radio frequency signal transmitted by the radio frequency transmitting unit, and is used to calculate the ball speed of the sphere according to the time difference of the radio frequency signal read each time through the processing unit, And it is used to transmit the calculated ball speed to the display unit of the handheld device for display through the wireless transmission unit. According to the sphere speed measurement system described in item 1 of the patent application, the signal transceiver device is a wearable device, the signal transceiver device is further provided with a display unit, and the signal transceiver device is further used for calculating The ball speed is displayed through the display unit. According to the sphere speed measurement system described in item 1 of the scope of patent application, the signal transceiver device is a handheld device, the signal transceiver device is further provided with a display unit, and the signal transceiver device is further used for calculating the calculated ball speed Display through the display unit. The sphere speed measurement system described in item 1 of the scope of patent application, wherein the radio frequency transmitting unit is an RFID tag, which can transmit radio frequency signals to the outside in the form of electric waves, and the frequency of the transmitted radio frequency signals is 135Khz, 13.56 One of Mhz and 920Mhz. As described in item 5 of the scope of patent application, the sphere speed measurement system, wherein the RFID tag is an electronic tag with a non-directional antenna. According to the sphere speed measurement system described in item 1 of the scope of patent application, the first radio frequency transmitting unit and the second radio frequency transmitting unit are respectively a first RFID tag and a second RFID tag, and the first An RFID tag and the second RFID tag are respectively an electronic tag with a directional antenna, and the first RFID tag and the second RFID tag are arranged opposite to each other. According to the sphere speed measurement system described in item 1 of the scope of patent application, the first radio frequency transmitting unit and the second radio frequency transmitting unit are respectively a first RFID tag and a second RFID tag, and the first An RFID tag and the second RFID tag are respectively an electronic tag with a directional antenna, and the first RFID tag and the second RFID tag are arranged at a vertical angle. The sphere speed measurement system described in item 1 of the scope of patent application, wherein the signal The transceiver device is further used to calculate the change in the acceleration of the sphere according to the time difference of the radio frequency signal read each time through the processing unit, and determine the change in the acceleration of the sphere according to the calculated change in the rotation speed and acceleration of the sphere. The ball of the sphere is light and heavy. According to the sphere speed measurement system described in item 1 of the scope of patent application, wherein the sphere is further provided with a vibration switch, and the vibration switch is coupled to the radio frequency transmitting unit, the first radio frequency transmitting unit and the The second radio frequency transmitting unit, the vibration switch is configured to turn on the radio frequency transmitting unit, the first radio frequency transmitting unit, and the second radio frequency transmitting unit when the sphere is sensed to vibrate. Turn off the radio frequency transmitting unit, the first radio frequency transmitting unit and the second radio frequency transmitting unit when the sphere is not sensed after a preset time of vibration. According to the sphere speed measurement system described in item 1 of the scope of the patent application, wherein the sphere is further covered with a skin, and the skin forms at least one seam gap and two sides of the at least one seam gap. Multiple suture holes. The sphere speed measurement system according to item 11 of the scope of patent application, wherein the radio frequency transmitting unit is arranged between the skin and the sphere. The sphere speed measurement system described in item 1 of the scope of patent application further includes at least two of the signal transceiving devices. A plurality of the signal transceiving devices are electrically connected to each other and arranged at intervals, and are used to read the wireless The radio frequency signal transmitted by the radio frequency transmitting unit is used to obtain the movement track of the sphere according to the time difference of the radio frequency signal read by each of the signal transceiver devices through the processing unit.

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