Ball strike parameter measurement device and ball strike parameter measurement method

Abstract

SOLUTION: A sensor control unit 201 receives transmitted microwaves and reflected waves from a moving body in a practice box using a Doppler sensor. A generation control unit 202 generates distribution data indicating a distribution of signal intensities for each velocity at a reception time. A storage control unit 203 starts storing distribution data generated over time. A reverse reproduction control unit 204 reproduces, in reverse chronological order, the distribution data stored over time, from a time point of the distribution data when the signal intensity becomes lower than an analysis start threshold toward the past. A BS calculation control unit 205 identifies, as a ball peak, a peak representing a maximum velocity among peaks of signal intensity in the distribution data reproduced in the reverse chronological order, and calculates a velocity of a golf ball. A HS calculation control unit 206 identifies distribution data at a time when the ball peak disappears among the distribution data reproduced in the reverse chronological order, and calculates a velocity of a golf club head on the basis of a head peak representing a maximum velocity among peaks of signal intensity in the identified distribution data.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hitting ball parameter measuring device and a hitting ball parameter measuring method. [Background technology]

[0002] Conventionally, there are technologies at golf driving ranges and golf courses that measure the speed of a golf ball (also called ball speed) and the speed of a golf club head (also called head speed) when a golf player hits a golf ball with the head of a golf club. For example, Japanese Patent Application Laid-Open Publication No. 2003-210638 (Patent Document 1) discloses a motion measurement device equipped with an ultrasonic sensor, a DSP, and a display. Here, the ultrasonic sensor is installed facing the golf club face, and the DSP performs A / D conversion of the detected sound pressure and frequency analysis of the digital signal. The display also displays the analysis results numerically. Furthermore, the motion measurement device measures the speed and acceleration of the club head by performing time-frequency analysis using a wavelet transform on the signal captured by the ultrasonic sensor. This allows the measurement device itself to be portable and perform accurate measurements when measuring the motion of the golf club head during a swing, i.e., its speed and acceleration.

[0003] Japanese Patent Application Laid-Open Publication No. 2009-153930 (Patent Document 2) discloses a head speed measuring device including a golf ball holding means, a Doppler sensor, a velocity calculation control means, and an impact detection means. The golf ball holding means has a fixing surface on one end for fixing the golf ball in a predetermined position and is installed on a horizontal surface (ground). When the golf club is swung, the Doppler sensor converts the movement of the head at the tip of the golf club into a frequency and outputs the frequency as a detection signal to the outside. The velocity calculation control means stores the detection signal and calculates the head speed based on the stored detection signal. The impact detection means detects when the golf ball leaves the golf ball holding means and inputs a separation signal to the velocity calculation control means. The velocity calculation control means calculates the head speed based on the voltage peak value of the detection signal immediately before the separation signal was input. This allows the head speed to be measured at the moment of impact when the head collides with the golf ball during a swing of the golf club.

[0004] Furthermore, Japanese Patent Laid-Open Publication No. 2010-022739 (Patent Document 3) discloses a golf support system including a head speed measurement means, a ball speed measurement means, a contact rate calculation means, and a notification means. Here, the head speed measurement means calculates the head speed of the club head as it moves with the swing of the golf club, and the ball speed measurement means calculates the ball speed of the ball hit by the club head as it swings. Furthermore, the contact rate calculation means calculates the contact rate based on the head speed and ball speed calculated by the head speed measurement means and the ball speed measurement means, respectively. Furthermore, the notification means compares the calculated contact rate with a preset reference contact rate, and if the contact rate exceeds the reference contact rate, notifies the user of a nice shot. This makes it possible to provide the user with information about the contact rate when actually hitting the ball (such as displaying contact rate history information and notifying the user of a nice shot) in an easy-to-understand manner.

[0005] Japanese Patent Application Laid-Open Publication No. 2010-253238 (Patent Document 4) discloses a head speed measurement device equipped with a Doppler sensor and a speed calculation control means. The Doppler sensor has a fixing surface at one end for fixing a golf ball in a predetermined position, a golf ball fixing means installed on a horizontal plane (ground), and a radiation surface for emitting a radio wave beam. When a golf club is swung, the Doppler sensor converts the movement of the head at the tip of the golf club into a frequency and outputs the frequency as a detection signal to the outside. The speed calculation control means calculates the head speed based on the frequency of the detection signal. The radiation surface is positioned below the horizontal plane directly below the swing path of the golf club and facing approximately zenithward on the side of the head that moves away from the golf ball fixing means. At least one of the radio wave beams emitted from the radiation surface is tilted from the vertical toward the golf ball fixing means. This allows the swing speed measurement device to be concealed underground.

[0006] Furthermore, Japanese Patent Laid-Open Publication No. 2011-089907 (Patent Document 5) discloses a moving object speed measurement device including a Doppler sensor, a detection unit, a storage unit, a determination unit, a period setting unit, a calculation unit, a display unit, and a control unit. Here, the Doppler sensor transmits a transmission wave toward the moving object and receives a reflected wave reflected by the moving object to generate a Doppler signal having a Doppler frequency. The detection unit converts the Doppler signal into intermediate data associated with the Doppler frequency and samples the intermediate data at a predetermined sampling period. Furthermore, the storage unit sequentially stores the intermediate data sampled by the detection unit over time, and the determination unit determines whether the values ​​of N consecutive intermediate data (N is a natural number greater than or equal to 2) stored in the storage unit have increased or decreased over time. If the determination result by the determination unit is positive, the period setting unit sets the point at which the value of N consecutive intermediate data increases or decreases as a boundary point, sets the period from the sampling time of the first data of the intermediate data to the boundary point as a first period, and sets the period from the boundary point to the sampling time of the last data of the intermediate data as a second period. The calculation unit performs a first calculation operation to obtain first speed data as the maximum speed based on the minimum or maximum value of the intermediate data in the first period, and a second calculation operation to obtain second speed data as the average speed based on the average value of the intermediate data in the second period. The display unit has a display area capable of displaying both the first speed data and the second speed data, and the control unit displays one or both of the first speed data and the second speed data in the display area. This allows both the maximum speed and the average speed of the moving object to be accurately measured and displayed.

[0007] Furthermore, Japanese Patent Publication No. 2014 / 045496 (Patent Document 6) discloses a measuring device for a moving object, which includes a single antenna, a Doppler sensor, a signal strength distribution data generation unit, a velocity calculation unit, and a movement direction calculation unit. Here, the single antenna has directionality and transmits a transmission wave toward the moving object based on a transmission signal provided thereto, and receives a reflected wave reflected by the moving object to generate a received signal. The Doppler sensor provides the transmission signal to the antenna and generates a Doppler signal having a Doppler frequency based on the received signal provided thereto. The signal strength distribution data generation unit performs frequency analysis on the Doppler signal obtained from the Doppler sensor to generate signal strength distribution data indicating the distribution of signal strength at each frequency. Here, the velocity calculation unit detects a Doppler frequency component corresponding to the moving velocity of the moving object based on the signal strength distribution data, and calculates the velocity based on the detected Doppler frequency component. Furthermore, the moving direction calculation unit calculates the moving direction from the speed calculated by the speed calculation unit based on the correlation between the difference between the moving body's speed at a reference time, which has been measured in advance, and the moving body's speed after a predetermined time has elapsed since the reference time, and the moving direction of the moving body. This makes it possible to measure the moving direction and moving speed of the moving body using only a single antenna, thereby reducing the cost and size of the measurement device. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-210638 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-153930 [Patent Document 3] Japanese Patent Application Laid-Open No. 2010-022739 [Patent Document 4] Japanese Patent Application Laid-Open No. 2010-253238 [Patent Document 5] Japanese Patent Application Laid-Open No. 2011-089907 [Patent Document 6] Re-tabled publication 2014 / 045496 Summary of the Invention [Problem to be solved by the invention]

[0009] Here, the ball speed and head speed when hitting a golf ball with a golf club head, and the smash factor calculated using these, are also called hit ball parameters, and indicate the quality of a golf player's play. Therefore, hit ball parameters are values ​​that are of great interest to golf players, and golf players are always seeking hit ball parameter measuring devices that can measure hit ball parameters with high accuracy.

[0010] On the other hand, a hitting ball parameter measurement device typically measures ball speed and head speed by installing a Doppler sensor behind the batter's box. Here, the Doppler sensor emits microwaves toward the batter's box and receives the microwaves reflected from the moving object, such as a golf club head or golf ball, present at the batter's box. The hitting ball parameter measurement device then calculates the ball speed and head speed of the moving object based on the difference between the frequency of the emitted microwaves and the frequency of the received microwaves from the Doppler sensor.

[0011] Since the Doppler sensor receives reflected microwaves from all moving objects at bat, it receives reflected microwaves related to the movement of not only the golf club head and golf ball but also the golf player's body, and calculates the velocities related to these movements as noise. As a result, it is difficult to distinguish between ball speed and head speed, which poses the problem of not being able to measure head speed or ball speed with high accuracy.

[0012] In particular, with regard to head speed, the Doppler sensor receives microwaves reflected from the movement of the golf club head as well as microwaves reflected from the movement of the golf player's hands and arms when operating the golf club. As a result, when calculating head speed, the ball hitting parameter measurement device also calculates the speeds related to the movement of the golf player's hands and arms, which always includes noise in the head speed, making it difficult to identify the head speed.

[0013] The technology described in Patent Document 1 uses wavelet transform, but even in this case, if the signal captured by the ultrasonic sensor contains a signal related to body movement, the same problem as described above occurs. Furthermore, the technology described in Patent Document 2 uses a departure signal indicating the golf ball has left the club and calculates head speed based on the voltage peak value of the detection signal immediately before the departure signal was input. However, it is unclear whether the voltage peak value of the immediately preceding detection signal accurately corresponds to the movement of the golf club head. Furthermore, the technology described in Patent Document 3 assumes that it is possible to calculate the head speed of the club head, which moves with the swing of the golf club, and it is unclear whether the head speed is accurate. Furthermore, the technology described in Patent Document 4 converts the movement of the head at the tip of the golf club into frequency. However, the frequency of that movement may change depending on the type of golf club, so it is unclear whether the head speed can always be calculated accurately. Furthermore, the technology described in Patent Document 5 calculates the maximum speed based on the minimum or maximum value of intermediate data for a first period among intermediate data associated with Doppler frequencies, and calculates the average speed based on the average value of intermediate data for a second period. However, it is unclear whether this technology can directly and accurately calculate head speed. Furthermore, the technology described in Patent Document 6 generates signal intensity distribution data showing the distribution of signal intensity for each frequency by frequency analysis of the Doppler signal obtained from the Doppler sensor, and detects Doppler frequency components corresponding to the moving speed of the moving object based on the signal intensity distribution data. However, even in this case, it is impossible to avoid detecting Doppler frequency components that become noise related to the movement of the golf player's hands and arms. Therefore, the technologies described in Patent Documents 1 to 6 cannot accurately measure ball speed or head speed.

[0014] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a hitting ball parameter measurement device and a hitting ball parameter measurement method that are capable of measuring ball speed and head speed with high accuracy. [Means for solving the problem]

[0015] The hit ball parameter measurement device according to the present invention includes a sensor control unit, a generation control unit, an accumulation control unit, a reverse playback control unit, a BS calculation control unit, and an HS calculation control unit. The sensor control unit uses a Doppler sensor to emit microwaves toward a tee where a golf player hits a golf ball with a golf club head, and receives the emitted microwaves and reflected waves from a moving object at the tee. The generation control unit generates distribution data indicating a distribution of signal strength for each velocity at the time of reception based on the received microwaves and reflected waves. The accumulation control unit starts accumulating distribution data generated over time when the signal strength of some velocities in the generated distribution data exceeds a predetermined acquisition start threshold. The reverse playback control unit plays back the distribution data accumulated over time in a reverse chronological manner, starting from the time of distribution data where the signal strength fell below the predetermined analysis start threshold, when the signal strength of all velocities in the accumulated distribution data falls below the predetermined analysis start threshold. The BS calculation control unit identifies the peak indicating the maximum velocity among the signal intensity peaks of the distribution data reproduced in the reverse chronological manner as a ball peak, and calculates the velocity of the golf ball based on the identified ball peak.The HS calculation control unit identifies the distribution data at the time when the ball peak disappeared among the distribution data reproduced in the reverse chronological manner, and calculates the velocity of the golf club head based on the head peak indicating the maximum velocity among the signal intensity peaks of the identified distribution data.

[0016] The hitting ball parameter measurement method according to the present invention includes a sensor control step, a generation control step, an accumulation control step, a reverse playback control step, a BS calculation control step, and an HS calculation control step. Each control step of the hitting ball parameter measurement method corresponds to each control unit of the hitting ball parameter measurement device. [Effects of the Invention]

[0017] According to the present invention, it is possible to measure ball speed and head speed with high accuracy. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a schematic diagram of a ball-hitting parameter measuring device according to the present invention. [Figure 2] 1 is a functional block diagram of a hitting ball parameter measurement device according to the present invention. [Figure 3] 1 is a flowchart showing the execution procedure of a hit ball parameter measurement method according to the present invention. [Figure 4] FIG. 4A shows an example of a Doppler sensor, measuring device, display device, and image capturing device of a hitting ball parameter measuring device according to the present invention, and FIG. 4B shows an example of first distribution data at a first time obtained by the Doppler sensor. [Figure 5] FIG. 5A is a diagram showing an example of first distribution data at a first time and second distribution data at a second time, and FIG. 5B is a diagram showing an example of third distribution data at a third time and storage in memory. [Figure 6] FIG. 6A is a diagram showing an example of fourth distribution data at a fourth time and fifth distribution data at a fifth time, and FIG. 6B is a diagram showing an example of sixth distribution data at a sixth time and seventh distribution data at a seventh time. [Figure 7] FIG. 7A shows an example of calculating ball speed using analysis data played back in reverse chronological order, and FIG. 7B shows an example of calculating head speed using analysis data played back in reverse chronological order. [Figure 8] FIG. 8A is a diagram showing an example of various head peak shapes, and FIG. 8B is a diagram showing an example of an image of a batting position and a trajectory of a golf ball using trigger times. [Figure 9] 9A is a diagram showing an example of an embodiment of a ball hitting parameter measuring device, and FIG. 9B is a diagram showing an example of an image of a golf player's swing. [Figure 10] FIG. 10A shows an example of third distribution data at a third time indicating the acquisition start threshold, and FIG. 10B shows an example of seventh distribution data at a seventh time indicating the analysis start threshold. [Figure 11]FIG. 11A shows an example of calculating ball speed using sixth distribution data at a sixth time, and FIG. 11B shows an example of calculating head speed using fourth distribution data at a fourth time. [Figure 12] FIG. 10 is a diagram showing an example of calculation results of ball speed and head speed in a reference example and an example. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings to help understand the present invention. Note that the following embodiment is an example of the present invention and is not intended to limit the technical scope of the present invention.

[0020] As shown in Figure 1, the hitting ball parameter measuring device 1 of the present invention is installed at a hitting box 100 where a golf player P hits a golf ball B with a golf club head H, and is equipped with a Doppler sensor 10 and a measuring device 11.

[0021] Here, Doppler sensor 10 includes transmitter 10a and receiver 10b, and emits microwaves from transmitter 10a onto batter's box 100. The microwaves are then irradiated onto and reflected by moving objects (e.g., golf club head H, golf ball B, golf player P, etc.) present above batter's box 100, and Doppler sensor 10 receives the reflected microwaves at receiver 10b.

[0022] In addition, the measuring device 11 is communicatively connected to the Doppler sensor 10, and calculates the speed of the golf ball B (ball speed) and the speed of the golf club head H (head speed) based on the frequency of the microwaves emitted from the Doppler sensor 10 and the frequency of the reflected waves of the received microwaves (described below).

[0023] Furthermore, the hitting ball parameter measurement device 1 may also include a display device 12. The display device 12 is communicably connected to the measurement device 11 and displays the ball speed, head speed, etc. calculated by the measurement device 11. Here, the measurement device 11 may also serve as the display device 12, and may be, for example, a terminal device or a mobile terminal device in which the measurement device 11 and the display device 12 are integrated.

[0024] The hitting ball parameter measurement device 1 may also include an image capture device 13. The image capture device 13 is communicably connected to the measurement device 11 and captures images of the tee box 100. The measurement device 11 utilizes the image from the image capture device 13 and the calculated ball speed and head speed to display the trajectory of the ball B and the movement of the golf player P within the image. Here, the image capture device 13 may be, for example, a high-performance camera capable of high-resolution, high-speed continuous shooting. The image capture device 13 is basically a single camera, but may also be multiple (for example, two) cameras.

[0025] Here, there are no particular limitations on the configuration of the Doppler sensor 10, measuring device 11, display device 12, and image capturing device 13, but for example, all of the devices may be configured as terminal devices or mobile terminal devices, or the Doppler sensor 10 and image capturing device 13 may be installed at the hitting bay 100, the measuring device 11 may be a cloud on the network, and the display device 12 and image capturing device 13 may be mobile terminal devices that the golf player carries with him to the field.

[0026] The Doppler sensor 10 and the measuring device 11 each incorporate a CPU (GPU), ROM, RAM, etc. (not shown), and the CPU uses the RAM as a work area, for example, to execute programs stored in the ROM, etc. If the display device 12 and the image capturing device 13 are present, the display device 12 and the image capturing device 13 also incorporate a CPU (GPU), ROM, RAM, etc. Each control unit, which will be described later, is realized by the CPU executing a program.

[0027] Next, the configuration and execution procedure according to an embodiment of the present invention will be described with reference to Figures 2 to 7. First, a golf player P visits a golf driving range or golf course and, as shown in Figure 4A, turns on the Doppler sensor 10 and the measurement device 11 of the hitting ball parameter measurement device 1 provided at the hitting box 100. Then, the Doppler sensor 10 and the measurement device 11 start up (Figure 3: S101).

[0028] Here, there are no particular limitations on the configuration of the Doppler sensor 10 and the measuring device 11 of the hitting ball parameter measuring device 1. For example, the Doppler sensor 10 and the measuring device 11 can be connected via wireless communication, and the Doppler sensor 10 is installed in advance behind the hitting box 100. Then, when the golf player P turns on the power to the Doppler sensor 10 and the Doppler sensor 10 starts up, the Doppler sensor 10 emits microwaves toward the hitting box 100. Then, if there is a moving object above the hitting box 100, the microwaves are reflected by the moving object and become reflected waves, and the Doppler sensor 10 receives the reflected waves from the moving object present above the hitting box 100.

[0029] Furthermore, the measuring device 11 may be, for example, a terminal device provided in advance at the tee box 100, or a portable terminal device carried by the golf player P. Then, when the golf player P starts software (app) downloaded in advance to the measuring device 11, the sensor control unit 201 of the measuring device 11 starts wireless communication with the Doppler sensor 10. Here, when the Doppler sensor 10 emits microwaves toward the tee box 100 or receives reflected waves from a moving object above the tee box 100, the sensor control unit 201 communicates with the Doppler sensor 10 to enable reception of the microwaves emitted from the Doppler sensor 10 and the reflected waves from the moving object above the tee box 100.

[0030] If the ball hitting parameter measuring device 1 is equipped with a display device 12, when the golf player P turns on the display device 12, the display device 12 starts wireless communication with the measuring device 11. The display device 12 is provided, for example, on the side of the tee box 100, and the golf player P who has swung at the tee box 100 can immediately check the ball speed, head speed, etc. that have been measured afterwards on the display device 12.

[0031] Furthermore, if the hitting ball parameter measurement device 1 is equipped with an image capturing device 13, when the golf player P activates the image capturing device 13, the image capturing device 13 begins wireless communication with the measurement device 11. The image capturing device 13 is provided, for example, behind the tee box 100, and captures images of the area around the tee box 100, and the golf player P can immediately check the images and videos captured by the image capturing device 13 on the measurement device 11 or the display device 12.

[0032] 4B, when golf player P stands on the batter's box 100 and places golf ball B on the batter's box 100, the sensor control unit 201 receives the emitted microwaves and the reflected waves from golf player P using the Doppler sensor 10 (FIG. 3: S102). This makes it possible to use the Doppler sensor 10 to monitor golf player P on the batter's box 100 swinging golf ball B with the head H of the golf club.

[0033] Now, when the sensor control unit 201 receives the microwaves and reflected waves, the generation control unit 202 of the measuring device 11 then generates distribution data indicating the distribution of signal strength for each speed at the time of reception based on the received microwaves and reflected waves (FIG. 3: S103).

[0034] Here, there is no particular limitation on the generation method of the generation control unit 202. For example, the generation control unit 202 performs a predetermined frequency analysis process on the transmitted microwaves and the received reflected waves to generate distribution data D1 that indicates the distribution of signal strength I(-) for each speed V (m / s), as shown in Fig. 4B. Here, there is no particular limitation on the frequency analysis, and examples include fast Fourier transform and complex fast Fourier transform.

[0035] Here, in addition to the received microwaves and reflected waves, the generated distribution data D1 may contain noise specific to the Doppler sensor 10. In such cases, the generation control unit 202 may apply a predetermined filter to the generated distribution data D1 to remove the noise specific to the device from the distribution data D1. This allows the ball speed BS and head speed HS to be calculated with high accuracy.

[0036] The generation control unit 202 then obtains the first time t1 (s) at which the microwave and the reflected wave were received from a pre-installed timer, and generates first distribution data D1 at the first time t1 by associating the obtained first time t1 with the generated first distribution data D1. This makes it possible to represent the movement of the golf player P at the hitting box 100 as a distribution of signal strength I(-) for each speed V (m / s), and to associate the time with the distribution.

[0037] After the generation control unit 202 generates the first distribution data D1, the accumulation control unit 203 of the measuring device 11 determines whether the signal strength I(-) of some velocities V (m / s) in the generated first distribution data D1 exceeds a preset acquisition start threshold Ts(-) (FIG. 3: S104). If the signal strength I(-) of some velocities V (m / s) in the first distribution data D1 exceeds the acquisition start threshold Ts(-) (FIG. 3: S104 YES), the accumulation control unit 203 starts accumulating the distribution data D generated over time (FIG. 3: S105).

[0038] Here, there is no particular limitation on the accumulation method of the accumulation control unit 203. For example, as shown in Fig. 5A, the accumulation control unit 203 sets an acquisition start threshold Ts(-) for the signal strengths I(-) of all velocities V (m / s) of the first distribution data D1, and determines whether the signal strengths I(-) of some velocities V (m / s) of the first distribution data D1 exceed the acquisition start threshold Ts(-) (Fig. 3: S104).

[0039] Here, the acquisition start threshold Ts(-) is set appropriately depending on the environment of the tee box 100, the type of golf player P, the type of golf club, etc., but it is preferable to, for example, acquire distribution data D in advance when golf player P swings at the tee box 100, and set the acquisition start threshold Ts(-) to the maximum signal strength or a subtracted value obtained by subtracting a predetermined value from the maximum signal strength of the signal strength I(-) of the acquired distribution data D.

[0040] If the result of the determination is that the signal strength I(-) of all velocities V (m / s) of the first distribution data D1 does not exceed the acquisition start threshold Ts(-), that is, if the signal strength I(-) of all velocities V (m / s) of the first distribution data D1 is equal to or less than the acquisition start threshold Ts(-), the accumulation control unit 203 determines not to start accumulating the first distribution data D1 yet (FIG. 3: S104 NO). In this case, the process returns to S102, where the sensor control unit 201 receives microwaves and reflected waves (FIG. 3: S102), and the generation control unit 202 generates distribution data for the next time (FIG. 3: S103).

[0041] In this way, if the signal strength I(-) of all velocities V (m / s) of the distribution data D does not exceed the acquisition start threshold Ts(-), it means that the golf player P is not moving vigorously on the hitting box 100 and is not swinging the golf club head H. In this case, the accumulation control unit 203 does not start accumulating the distribution data D, thereby making it possible to prevent the accumulation of distribution data D that is not related to the calculation of the ball speed BS or the head speed HS.

[0042] In particular, since the swing time of golf player P is as short as a few seconds, accumulating analysis data D for a long period of time in order to capture a swing time of a few seconds would require a huge amount of memory capacity, which is not realistic. In the present invention, by streamlining the start timing of accumulating distribution data D, it is possible to avoid accumulating unnecessary distribution data D.

[0043] For example, as shown in FIG. 5A, when golf player P prepares to swing at hitting box 100, second analysis data D2 is generated at second time t2 (s) in S103. In this case, golf player P is not swinging the golf club head H, and therefore, in S104, the signal strength I(-) of all velocities V (m / s) in the second distribution data D2 does not exceed the acquisition start threshold Ts(-) (FIG. 3: S104 NO). Therefore, in this case as well, the process returns to S102.

[0044] On the other hand, for example, as shown in FIG. 5B , if golf player P is about to take a swing while standing at the hitting box 100, third analysis data D3 is generated at a third time t3(s) in S103. In this case, golf player P moves vigorously as he swings the head H of his golf club while standing at the hitting box 100. As a result, in the third analysis data D3 at the third time t3(s), the signal strength I(-) at a specific speed V (m / s) becomes significantly high, and the signal strength I(-) at some speeds V (m / s) in the third distribution data D3 exceeds the acquisition start threshold Ts(-).

[0045] That is, in S104, if the determination result indicates that the signal strength I(-) of a portion of the velocity V (m / s) in the third distribution data D3 exceeds the acquisition start threshold Ts(-), the accumulation control unit 203 determines to start accumulating the third distribution data D3 (FIG. 3: S104 YES). In this case, the accumulation control unit 203 stores the third analysis data D3 at the third time t3 (s) in a predetermined memory M provided in advance, and starts accumulating the distribution data D (FIG. 3: S105). This makes it possible to start accumulating the distribution data D from the time when the golf player P is about to take a swing at the hit box 100, and makes it possible to efficiently accumulate the distribution data D related to the calculation of the ball speed BS and the head speed HS.

[0046] After the storage control unit 203 starts storing the distribution data D, the reverse playback control unit 204 of the measuring device 11 determines whether the signal strength I(-) of all velocities V (m / s) in the stored distribution data D is less than a predetermined analysis start threshold Ta(-) (FIG. 3: S106 YES). If the signal strength I(-) of all velocities V (m / s) in the stored distribution data D is less than the analysis start threshold Ta(-) (FIG. 3: S106 YES), the reverse playback control unit 204 plays back the distribution data D stored over time in a reverse chronological manner, starting from the time of the distribution data D at which the signal strength I(-) became less than the analysis start threshold Ta(-) and proceeding backward (FIG. 3: S107).

[0047] Here, there is no particular limitation on the reverse time-lapse playback method of the reverse playback control unit 204. For example, following the third time t3(s), as shown in FIG. 6A, if golf player P swings at the hitting box 100 and hits golf ball B with the head H of the golf club, fourth analysis data D4 is generated at the fourth time t4(s) and stored in memory M. Then, the reverse playback control unit 204 sets an analysis start threshold Ta(-) for the signal intensities I(-) of all velocities V (m / s) in the fourth analysis data D4, and determines whether the signal intensities I(-) of all velocities V (m / s) in the fourth distribution data D4 are less than the analysis start threshold Ta(-) (FIG. 3: S106).

[0048] Here, the analysis start threshold Ta(-), like the acquisition start threshold Ts(-), is set appropriately depending on the environment of the tee box 100, the type of golf player P, the type of golf club, etc. However, it is preferable to acquire distribution data D in advance when golf player P completes his swing at the tee box 100, and set the minimum signal intensity or an added value obtained by adding a predetermined value to the minimum signal intensity from the signal intensity I(-) of the acquired distribution data D as the analysis start threshold Ta(-).

[0049] Furthermore, it is preferable to set the analysis start threshold Ta(-) low and the acquisition start threshold Ts(-) high. In other words, it is preferable to set the analysis start threshold Ta(-) lower than the acquisition start threshold Ts(-). As a result, when the analysis start threshold Ta(-) is low, the start timing of analysis of the analysis data D, which will be described later, can be brought closer to the completion of the golf player P's swing, making it possible to efficiently accumulate the analysis data D. When the acquisition start threshold Ts(-) is high, it is possible to bring the start timing of accumulation of the analysis data D closer to the time just before the golf player P's swing, making it possible to efficiently accumulate the analysis data D.

[0050] If the result of the determination shows that the signal strength I(-) of all velocities V (m / s) of the fourth distribution data D4 is not less than the analysis start threshold Ta(-), that is, if the signal strength I(-) of all velocities V (m / s) of the fourth distribution data D4 is equal to or greater than the analysis start threshold Ta(-), the reverse playback control unit 204 determines not to start analyzing the analysis data D yet (FIG. 3: S106 NO). In this case, the process returns to S105, and the storage control unit 203 stores the analysis data D for the next time (FIG. 3: S105).

[0051] In this way, if the signal strength I(-) of all velocities V (m / s) in the distribution data D is not less than the analysis start threshold Ta(-), it is highly likely that the golf player P is currently swinging. In this case, the reverse playback control unit 204 does not start analyzing the distribution data D, thereby making it possible to continuously accumulate distribution data D of movements related to the calculation of the ball speed BS and the head speed HS.

[0052] For example, as shown in FIG. 6A, when golf player P is swinging, fifth analysis data D5 is generated at fifth time t5 (s) and stored in memory M. In this case, the fifth distribution data D5 represents the state immediately after golf ball B has been launched, and a peak in signal intensity I(-) appears as a peak for golf ball B at a speed faster than the movement speed of golf player P and the movement speed of golf club head H. Again, since golf player P is still swinging, in S106, none of the signal intensities I(-) at any speed V (m / s) in the fifth distribution data D5 are less than the analysis start threshold Ta(-) (FIG. 3: S106 NO). Therefore, in this case, too, the process returns to S105.

[0053] Furthermore, for example, as shown in FIG. 6B, after golf player P has taken a swing, sixth analysis data D6 is generated at sixth time t6 (s) and stored in memory M. In this case, the sixth analysis data D6 indicates a point when golf ball B has traveled a further distance, and the golf ball B exhibits a stronger peak at the same speed as before. Again, since golf player P is still swinging, in S106, the signal intensity I(-) of all speeds V (m / s) in the sixth distribution data D6 does not become less than the analysis start threshold Ta(-) (FIG. 3: S106 NO). In this case, too, the process returns to S105.

[0054] On the other hand, for example, as shown in FIG. 6B , when golf player P finishes his swing and stops his body, seventh analysis data D7 is generated at seventh time t7(s) and stored in memory M. In this case, the seventh distribution data D7 indicates the time when golf ball B was flying far and golf player P stopped his body. Therefore, in the seventh distribution data D7, the peak of golf ball B appears weaker at the same velocity as before. Furthermore, because golf player P has stopped his body, the signal strength I(-) of the seventh analysis data D7 is generally weaker at all velocities, and the signal strength I(-) of all velocities V (m / s) in the seventh distribution data D7 is less than the analysis start threshold Ta(-).

[0055] That is, in S106, if the signal strength I(-) of all velocities V (m / s) of the seventh distribution data D7 is determined to be less than the analysis start threshold Ta(-), the reverse playback control unit 204 determines to start analyzing the analysis data D (FIG. 3: S106 YES). In this case, the reverse playback control unit 204 refers to the analysis data D stored in the memory M, and plays back the distribution data D accumulated over time in a reverse chronological manner from the seventh time t7 (analysis start time) of the seventh distribution data D7, at which the signal strength I(-) became less than the analysis start threshold Ta(-), toward the past (FIG. 3: S107). Here, "playback" means referring to (reading) data arranged over time in order from the beginning, whereas "reverse playback" in the present invention means referring to the chronologically arranged distribution data D in reverse order (reverse chronologically) from the analysis start time t. This makes it possible to start analyzing the distribution data D from the timing when the golf player P finishes his swing, thereby enabling efficient analysis of the distribution data D.

[0056] Here, when the signal strength I(-) of all velocities V (m / s) in the accumulated distribution data D becomes less than the analysis start threshold Ta(-), the accumulation control unit 203 may end the accumulation of the analysis data D. This makes it possible to avoid accumulating the analysis data D after the golf player P has finished his swing.

[0057] Now, when the reverse playback control unit 204 plays back the distribution data D in reverse time sequence, the BS calculation control unit 205 of the measuring device 11 next identifies the peak BP indicating the maximum speed among the peaks of the signal intensity I(-) of the distribution data D played back in reverse time sequence as the ball peak, and calculates the ball speed BS (m / s) based on the identified ball peak BP (Figure 3: S107).

[0058] Here, the calculation method of the BS calculation control unit 205 is not particularly limited. For example, as shown in FIG. 7A , based on the memory M, starting from the seventh time t7 of the seventh distribution data D7, the sixth distribution data D6 at the immediately preceding sixth time t6 is reproduced (referenced), and the fifth distribution data D5 at the even earlier fifth time t5 is reproduced. Then, among the signal intensities I(-) of the seventh distribution data D7, the sixth distribution data D6, and the fifth distribution data D5, there is a ball peak BP indicating the maximum velocity. This ball peak BP appears as a narrow peak because it is caused by the golf ball B. This is because the moving object with the fastest velocity in the swing of the golf player P is the golf goal B. Therefore, the BS calculation control unit 205 identifies the ball peak BP indicating the maximum velocity from the signal intensities I(-) of each velocity V (m / s) in the distribution data D reproduced in reverse chronological order.

[0059] Here, there is no particular limitation on the method by which the BS calculation control unit 205 identifies the golf peak BP. For example, the BS calculation control unit 205 identifies the distribution data D at time t where the signal strength I(-) of the ball peak BP is strongest from the distribution data D played back in reverse chronological order (for example, the sixth distribution data D6 at the sixth time t6), and identifies the ball peak BP from the identified distribution data D6, which makes it easier to calculate the ball speed BS (m / s), and is therefore preferable.

[0060] Next, the BS calculation control unit 205 determines the ball speed BS (m / s) using the identified ball peak BP. Here, since the determined ball speed BS (m / s) varies slightly depending on the shape of the ball peak BP, the BS calculation control unit 205 can appropriately adopt a method for determining the ball speed BS (m / s), which will be described later.

[0061] For example, as shown in Figure 7A, the ball speed BS (m / s) may be determined as the speed V (m / s) representing the peak top PT of the ball peak BP. Alternatively, the peak start PS and peak end PE of the ball peak BP may be identified, and the speed V (m / s) representing the midpoint between the peak start PS and peak end PE may be determined as the ball speed BS (m / s). Furthermore, the peak top PT, peak start PS, and peak end PE may be identified, and the peak area of ​​the ball peak BP may be calculated using the peak top PT, peak start PS, peak end PE, and the height of the ball peak BP. The speed V (m / s) representing the midpoint of the peak area of ​​the ball peak BP may be determined as the ball speed BS (m / s).

[0062] In this way, by reproducing the distribution data D in reverse chronological order, it is possible to immediately identify the ball peak BP, and to easily calculate the ball speed BS (m / s).

[0063] After the BS calculation control unit 205 calculates the ball speed BS (m / s), the HS calculation control unit 206 of the measurement device 11 next identifies the distribution data D at time t when the ball peak BP disappeared from the distribution data D reproduced in reverse chronological order, and calculates the head speed HS (m / s) based on the head peak HP, which indicates the maximum speed, among the peaks of signal intensity I(-) in the identified distribution data D (FIG. 3: S108). The time t when the ball peak BP disappeared can also be considered to be the time t immediately before the ball peak BP appeared.

[0064] Here, the calculation method of the HS calculation control unit 206 is not particularly limited. For example, as shown in FIG. 7B , based on the memory M, starting from the sixth time t6 of the sixth distribution data D6 that identified the ball peak BP, the fifth distribution data D5 at the previous fifth time t5 is reproduced, and then the fourth distribution data D4 at the even earlier fourth time t4 is reproduced. Then, as the sixth distribution data D6 is reproduced to the fourth distribution data D4, the signal intensity I(-) of the ball peak BP gradually weakens, and the ball peak BP disappears in the fourth distribution data D4. This indicates the point in golf player P's swing immediately before golf player P hits golf ball B with the head H of the golf club. Therefore, the HS calculation control unit 206 identifies the fourth distribution data D4 at the fourth time t4, at which the ball peak BP disappeared, from the signal intensity I(-) of the distribution data D reproduced in reverse chronological order.

[0065] Here, there is no particular limitation on the method by which the HS calculation control unit 206 identifies the distribution data D. However, for example, the HS calculation control unit 206 focuses on the signal strength I(-) of the ball peak BP among the distribution data D reproduced in reverse chronological order, and determines whether the signal strength I(-) of the ball peak BP gradually weakens and reaches zero. If the signal strength I(-) of the ball peak BP reaches zero, the HS calculation control unit 206 infers that the signal strength I(-) of the ball peak BP has disappeared, and identifies the distribution data D for the time t when the ball peak BP disappeared (for example, the fourth distribution data D4 for the fourth time t4), which is preferable because it makes it easier to calculate the next head speed HS (m / s). Furthermore, depending on the distribution data D, the signal intensity I(-) may not be completely zero. Therefore, for example, the HS calculation control unit 206 may determine whether the signal intensity I(-) of the ball peak BP in the distribution data D reproduced in reverse chronological order is below a preset lower threshold, and if the signal intensity I(-) of the ball peak BP is below the lower threshold, the HS calculation control unit 206 may assume that the signal intensity I(-) of the ball peak BP has disappeared, and identify the distribution data D at that time t.

[0066] Next, the HS calculation control unit 206 identifies the head peak HP indicating the maximum speed from among the peaks of the signal intensity I(-) of the identified fourth distribution data D4.

[0067] Here, in golf player P's swing, the moving object exhibiting the maximum speed immediately before golf player P hits golf ball B with golf club head H is golf club head H. In other words, the maximum speed immediately after golf player P hits golf ball B with golf club head H is ball speed BS (m / s), but the maximum speed immediately before golf player P hits golf ball B with golf club head H is head speed HS (m / s). Therefore, by estimating the time t when ball peak BP disappears to be the time immediately before golf player P hits golf ball B with golf club head H and estimating the fastest moving object at that time to be golf club head H, it is possible to appropriately identify ball speed BS (m / s) and head speed HS (m / s).

[0068] 7B, unlike the ball peak BP caused by the golf ball B, the head peak HP caused by the head H of the golf club often appears combined with peaks caused by the arms and legs of the golf player P. Therefore, the HS calculation control unit 206 identifies the wide peak that includes the maximum velocity V (m / s) in the fourth distribution data D4 at the fourth time t4 when the ball peak BP has disappeared as the head peak HP.

[0069] Then, the HS calculation control unit 206 determines the head speed HS (m / s) using the identified head peak HP. Here, since the determined head speed HS (m / s) varies slightly depending on the shape of the head peak HP, the HS calculation control unit 206 can appropriately adopt a method for determining the head speed BS (m / s), which will be described later.

[0070] For example, as shown in Figure 7B, if the head peak HP and a large peak P indicating a slow speed are combined, but the peak top PT of the head peak HP can be confirmed, the speed HV (m / s) indicating the peak top PT of the head peak HP may be determined as the head speed HS (m / s). Alternatively, the peak end PE of the head peak HP may be identified, and the speed HV (m / s) indicating the peak end PE may be determined as the head speed HS (m / s). Furthermore, the peak top PT and the peak end PE may be identified, and the intermediate value HV (m / s) between the peak top PT and the peak end PE may be determined as the head speed HS (m / s).

[0071] In this way, by reproducing the distribution data D in reverse chronological order, it becomes possible to immediately identify the disappearance of the ball peak BP, and to easily calculate the head speed HS (m / s).

[0072] Incidentally, depending on the environment of the tee box 100, the type of golf player P, the type of golf club, etc., the shape of the head peak HP may be a narrow peak like the ball peak BP, a weak peak, or may be combined with a large peak P indicating a slow speed, as shown in Figure 8A. In these cases, the method for determining the head speed HS may be changed depending on the shape of the head peak HP, or a common determination method may be adopted that can determine the head speed HS in common regardless of the shape of the head peak HP.

[0073] For example, if the shape of the head peak HP is a narrow peak like the ball peak BP, the head speed BS (m / s) may be determined as follows: the speed V (m / s) indicating the peak top PT of the head peak HP may be determined as the head speed BS (m / s) in the same manner as the method for determining the ball speed BS (m / s). Alternatively, the peak start PS and peak end PE of the head peak HP may be identified, and the speed V (m / s) indicating the median value between the peak start PS and the peak end PE may be determined as the head speed BS (m / s). Furthermore, the peak top PT, peak start PS, and peak end PE may be identified, and the peak area of ​​the head peak HP may be calculated using the peak top PT, peak start PS, peak end PE, and the height of the head peak HP, and the speed V (m / s) indicating the median value of the peak area of ​​the head peak HP may be determined as the head speed BS (m / s).

[0074] Furthermore, when the shape of the head peak HP is a weak peak, the head speed BS (m / s) may be determined by using the speed V (m / s) indicating the peak top PT of the head peak HP as the head speed BS (m / s) from among the above-mentioned determination methods. Furthermore, when the shape of the head peak HP is combined with a large peak P indicating a slow speed, the head speed BS (m / s) may be determined by using the speed HV (m / s) indicating the peak end PE as the head speed HS (m / s) from among the above-mentioned determination methods. Furthermore, regardless of the shape of the head peak HP, a common determination method that can be applied may be, for example, determining the speed HV (m / s) indicating the peak end PE as the head speed HS (m / s).

[0075] Once the HS calculation control unit 206 calculates the head speed HS (m / s), the display control unit 207 of the measurement device 11 displays the calculated ball speed BS (m / s) and head speed HS (m / s) (FIG. 3: S109).

[0076] Here, there are no particular limitations on the display method used by the display control unit 207, but for example, the display control unit 207 displays the ball speed BS (m / s) and the head speed HS (m / s) on the display device 12 connected to the measurement device 11. This allows the golf player P to easily check the ball speed BS (m / s) and head speed HS (m / s) related to his swing, thereby enabling him to check the condition of his swing and improve it.

[0077] Furthermore, the display control unit 207 calculates the quotient (-) obtained by dividing the head speed HS (m / s) by the ball speed BS (m / s) as the smash factor, and displays the calculated smash factor (-) on the display device 12. This allows the golf player P to easily check the smash factor related to the swing.

[0078] Furthermore, if the ball hitting parameter measuring device 1 is provided with an image capturing device 13, the sensor control unit 201 acquires an image of the batting station 100 from the image capturing device 13 when receiving microwaves and reflected waves from the Doppler sensor 10, and the display control unit 207 may display the acquired image of the batting station 100 directly on the display device 12, or may display the image of the batting station 100 together with the ball speed BS (m / s) and the head speed HS (m / s).

[0079] Here, the present invention may further include a trigger control unit 208 that acquires the time t immediately before the ball peak BP appears as the trigger time at which the golf player P hits the golf ball B with the head H of the golf club. In other words, the time t immediately before the ball peak BP appears in the analysis data D accumulated over time corresponds to the time at which the golf player P hits the golf ball B with the head H of the golf club. Therefore, in S108, when the HS calculation control unit 206 identifies the distribution data D at the time t immediately before the ball peak BP appears from the distribution data D played back in reverse chronological order, the trigger calculation control unit 208 acquires the time t immediately before the ball peak BP appears as the trigger time. Here, generally, to acquire the trigger time, images before and after the swing of the golf player P are captured by the image capturing device 13 along with the time, an image of the golf player P hitting the golf ball B with the head H of the golf club is identified from the captured images, and the time of that image is acquired as the trigger time. In the present invention, it is not necessary to take images of the golf player P before and after his swing using the image capturing device 13, or to identify an image of the golf player P hitting the golf ball B with the head H of the golf club, and it is possible to obtain the trigger time with high accuracy by analyzing the distribution data D.

[0080] Here, the trigger time t is used, for example, to identify, from among the images captured by the image capturing device 13, an image of the golf player P hitting the golf ball B with the head H of the golf club, or an image after the golf player P has hit the golf ball B with the head H of the golf club. For example, when the sensor control unit 201 acquires an image of the turn at bat 100 from the image capturing device 13 and the trigger control unit 208 acquires a trigger time t (for example, a fourth time t4), the display control unit 207 displays, on the display device 12, images of the turn at bat 100 from the trigger time t4 onwards, as shown in FIG. 8B . This allows the golf player P to easily check his or her own swing.

[0081] Furthermore, by acquiring the trigger time t, the display control unit 207 identifies golf ball B in images of the turn at bat 100 taken over time from the trigger time t onwards, connects the identified golf balls B over time with a line L, and displays the trajectory of golf ball B composed of golf ball B and line L on the display device 12. This allows golf player P to easily check the trajectory of golf ball B caused by his or her swing. [Example]

[0082] The effects of the present invention will be specifically explained below with reference to examples, but the present invention is not limited thereto.

[0083] First, a prototype of a hitting ball parameter measurement device 1 was created based on Figures 1 to 8, and this hitting ball parameter measurement device 1 was used as an example. As shown in Figure 9A, the hitting ball parameter measurement device 1 of the example includes a Doppler sensor 10 and a measurement device 11. The Doppler sensor 10 was installed behind the batting cage 100 and emitted microwaves above the batting cage 100. In addition, a commercially available product capable of measuring the ball speed BS and the head speed HS was installed at the batting cage 100, and this commercially available product was used as a reference example.

[0084] Then, as shown in FIG. 9B, when golf player P stands at bat 100 and hits golf ball B with head H of the golf club, Doppler sensor 10 receives the reflected wave of golf player P's swing, and sensor control unit 201 of measuring device 11 receives the microwave from Doppler sensor 10 and the reflected wave from golf player P.

[0085] Next, the generation control unit 202 of the measuring device 11 generated distribution data at the time of reception based on the received microwaves and reflected waves, and the accumulation control unit 203 of the measuring device 11 determined whether the signal strength I(-) of some of the velocities V (m / s) in the generated distribution data D exceeded a predetermined acquisition start threshold Ts(-).

[0086] 10A, in the third distribution data D3 at the third time t3, the signal intensity I(-) at some velocities V (m / s) exceeded the acquisition start threshold Ts(-), so the accumulation control unit 203 started accumulating the distribution data D generated over time. The analysis data D from the third time t3 onwards was accumulated over time.

[0087] Furthermore, the reverse playback control unit 204 of the measuring device 11 determined whether the signal strength I(-) of all velocities V (m / s) in the accumulated distribution data D was less than a predetermined analysis start threshold Ta(-).

[0088] 10B, in the seventh distribution data D7 at the seventh time t7, the signal strength I(-) of all velocities V (m / s) became less than the analysis start threshold Ta(-). Therefore, the reverse playback control unit 204 played back the distribution data D accumulated over time in a reverse chronological manner, from the time of the distribution data D at which the signal strength I(-) became less than the analysis start threshold Ta(-). Next, the BS calculation control unit 205 of the measurement device 11 identified the peak BP indicating the maximum velocity among the peaks of the signal strength I(-) of the distribution data D referenced in a reverse chronological manner as the ball peak, and calculated the ball speed BS (m / s) based on the identified ball peak BP.

[0089] Here, in the sixth distribution data D6 at the sixth time t6 that was reverse-played, the ball peak BP indicating the maximum speed was identified, as shown in FIG. 11A, and the ball speed BS (m / s) was calculated based on the ball peak BP.

[0090] In addition, the HS calculation control unit 206 of the measuring device 11 identified the distribution data D at time t when the ball peak BP disappeared from the distribution data D reproduced in reverse chronological order, and calculated the head speed HS (m / s) based on the head peak HP indicating the maximum speed among the peaks of signal intensity I(-) of the identified distribution data D.

[0091] Here, in the fourth distribution data D4 at the fourth time t4 that was played back in reverse, as shown in Figure 11B, the ball peak BP disappeared, and the head peak HP indicating the maximum speed at that time was identified, and the head speed HS (m / s) was calculated based on the head peak HP.

[0092] Here, when the calculated ball speed BS (m / s) and head speed HS (m / s) were checked, as shown in Figure 12, the head speed HS (m / s) of the Example was 41.1 m / s, and the head speed HS (m / s) of the Reference Example was 40 m / s, which was almost the same as the head speed HS (m / s) of the Reference Example. Furthermore, the ball speed BS (m / s) of the Example was 55.0 m / s, and the ball speed BS (m / s) of the Reference Example was 55 m / s, which was almost the same as the ball speed BS (m / s) of the Reference Example. This confirms that the present invention can measure ball speed BS (m / s) and head speed HS (m / s) with high accuracy.

[0093] In the embodiment of the present invention, the hitting ball parameter measurement device 1 is configured to include each control unit, but it is also possible to configure the hitting ball parameter measurement device 1 so that a program that realizes each control unit is stored on a storage medium and the storage medium is provided. In this configuration, the program is read into the device, and the device realizes each control unit. In this case, the program read from the storage medium itself achieves the effects of the present invention. Furthermore, it is also possible to provide a method for storing the control steps executed by each control unit on a hard disk. [Industrial Applicability]

[0094] As described above, the ball hitting parameter measuring device and ball hitting parameter measuring method of the present invention are effective as devices and methods for measuring ball speed and head speed in any field where balls are handled, and are effective as ball hitting parameter measuring devices and ball hitting parameter measuring methods that can measure ball speed and head speed with high accuracy. [Explanation of symbols]

[0095] 1. Ball batting parameter measuring device 10 Doppler sensor 11 Measuring equipment 12 Display device 13 Imaging device 201 Sensor control unit 202 Generation control unit 203 Storage control unit 204 Reverse playback control section 205 BS calculation control unit 206 HS calculation control unit 207 Display control unit 208 Trigger control section

Claims

1. a sensor control unit that uses a Doppler sensor to emit microwaves toward a hitting box where a golf player hits a golf ball with a golf club head, and receives the emitted microwaves and reflected waves from a moving object at the hitting box; a generation control unit that generates distribution data indicating a distribution of signal strength for each speed at the time of reception based on the received microwave and the reflected wave; an accumulation control unit that starts accumulating distribution data generated over time when signal strength of a part of the speeds among the generated distribution data exceeds a preset acquisition start threshold; a reverse playback control unit that, when signal intensities of all speeds among the accumulated distribution data become less than a predetermined analysis start threshold, plays back the distribution data accumulated over time in a reverse chronological manner from the time of distribution data when the signal intensities became less than the analysis start threshold toward the past; a BS calculation control unit that identifies a peak indicating a maximum speed as a ball peak among the signal intensity peaks of the distribution data reproduced in reverse chronological order, and calculates the speed of the golf ball based on the identified ball peak; an HS calculation control unit that identifies the distribution data at the time when the ball peak disappeared from the distribution data reproduced in reverse chronological order, and calculates the head velocity of the golf club based on the head peak that indicates the maximum velocity from among the peaks of signal intensity of the identified distribution data; A hitting ball parameter measuring device comprising:

2. the analysis start threshold is set lower than the acquisition start threshold; The ball parameter measuring device according to claim 1 .

3. a trigger control unit that acquires the time immediately before the appearance of the ball peak as a trigger time at which the golf player hits the golf ball with the head of the golf club; Further comprising: The ball parameter measuring device according to claim 1 .

4. a sensor control process for receiving, using a Doppler sensor that emits microwaves toward a hitting box where a golf player hits a golf ball with a golf club head, the emitted microwaves and reflected waves from a moving object at the hitting box; a generation control step of generating distribution data indicating a distribution of signal strength for each speed at the time of reception based on the received microwave and the reflected wave; an accumulation control step of starting accumulation of distribution data generated over time when signal strengths of some speeds among the generated distribution data exceed a preset acquisition start threshold; a reverse reproduction control step of reproducing, when the signal strengths of all speeds among the accumulated distribution data become less than a predetermined analysis start threshold, the distribution data accumulated over time in a reverse chronological manner from the time of the distribution data at which the signal strengths became less than the analysis start threshold toward the past; a BS calculation control step of identifying a peak indicating a maximum speed as a ball peak among the peaks of signal strength of the distribution data reproduced in reverse time series, and calculating the speed of the golf ball based on the identified ball peak; a HS calculation control step of identifying the distribution data at the time when the ball peak disappeared from among the distribution data reproduced in the reverse chronological order, and calculating the head velocity of the golf club based on the head peak indicating the maximum velocity among the peaks of signal intensity of the identified distribution data; A method for measuring a ball parameter comprising:

Images