CN114295125A - Golf ball positioning method and distance measuring method, server and computer storage medium - Google Patents
Golf ball positioning method and distance measuring method, server and computer storage medium Download PDFInfo
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Abstract
The invention relates to a golf positioning method and distance measuring method, server and computer storage medium, when measuring the hitting distance, the hitting and falling positions are not required to be confirmed by using the map of the whole course, but the positions of the ball-sending platform and the hole cup of each hole which are accurately measured in advance are used as anchor points, the nearest anchor point is confirmed at the falling point, the moving direction of the current falling point and the moving distance relative to the nearest anchor point are obtained by the moving track estimation function of the mobile device, the falling position is converted by combining the position data of the anchor points, the hitting distance of the current hole (s-1) th pole and the falling position of the s-th pole are combined by using the collusion theorem, the falling position of the current hole (s-1) th pole and the falling position of the s-th pole are combined, the hitting distance of the current hole (s-1) th pole is calculated, the hole cup position of the current hole(s) pole is combined, the distance between the falling position of the current hole (s-1) pole and the hole cup position is obtained, and the precision error can be controlled to be about 1.5 yards, can replace satellite positioning data with error precision exceeding five meters and replace electronic instrument ranging.
Description
Technical Field
The invention relates to the field of golf, in particular to a golf positioning method, a distance measuring method based on the golf positioning, a server and a computer storage medium, and particularly relates to a method for measuring the distance between a hitting position and a cup.
Background
The game of golf is based on the number of strokes each player takes to drive a golf ball from the tee into the cup on the green, so technical statistics require determining how far each stroke or drop is from the cup, in order to compare the difference in the number of holes at any distance with other players. Distances are typically counted on the green with an accuracy of 1 foot or 30 cm, and outside the green with a code or meter.
Many people rely on various rangefinders for accurate ranging. But the distancer is not portable on the one hand, if on the other hand can't see the target because weather reason or be located the corner blind area, use the distancer can't the range finding. A more common method is to calculate the distance using satellite positioning. However, according to the prior art, the satellite positioning data error obtained by everyone's mobile device is large, typically exceeding five meters. Although professional games do not allow electronic distance measurement, the game organization still needs to count the distance between the hitting position and the cup of each club of the player, and therefore, a method for measuring the distance between the hitting position and the cup of each club more accurately needs to be developed.
Disclosure of Invention
The invention aims to provide a golf positioning method, a distance measurement method based on the golf positioning, a server and a computer storage medium, which can replace satellite positioning data with error precision exceeding five meters, replace electronic instrument distance measurement, accurately position the ball falling position of a golf and measure the distance between each hitting point or ball falling point and a hole cup.
The invention relates to a golf positioning method, which comprises at least one mobile device provided with a positioning and ranging APP, wherein the mobile terminal has a mobile track estimation function, the positioning and ranging APP can continuously obtain the real-time moving direction and moving distance of a handheld user through the mobile track estimation function, a place with known accurate position data in advance is called an anchor point, and the pre-measured service position (X) is called an anchor pointt,Yt) And position of hole cup (X)c,Yc) Set as a start anchor and an end anchor, the user holds the mobile device from the serving position (X) of the current holet,Yt) Move toPosition of cup (X)c,Yc) Continuously obtaining real-time moving direction and moving distance relative to all anchor points through the moving track estimation function, confirming a current ball falling point through a mobile device when a user arrives at a place where a ball stays, confirming an anchor point closest to the current ball falling point through a positioning and ranging APP, converting the moving direction of the current ball falling point and the moving distance relative to the anchor point closest to the current ball falling point through the moving track estimation function according to position data of the anchor point, and calculating the ball falling position (X) of the current ball falling points,Ys)。
And adding at least one intermediate anchor point between the start anchor point and the end anchor point.
The motion track estimation function is to calculate and obtain the motion track by inertial positioning through a gyro triaxial sensor.
The motion track estimation function is to continuously acquire video streams in motion through a camera, combine difference conditions of different frames and measure the motion distance of each frame of the ground object by utilizing focusing, thereby realizing the estimation of the motion track.
Before a user drives a ball on the ball serving table, the user firstly confirms the ball serving table of the current hole through the mobile equipment, and positions and measures the APP to preset the ball serving position (X) of the current holet,Yt) And as the origin of a coordinate system, starting a movement track estimation function at the same time, continuously operating the movement track estimation function by the handheld mobile equipment between the serving table of the current hole and the hole cup of the green, and confirming the current ball falling point at the positioning distance measuring APP of the mobile equipment by the user at the position above the ball when the user reaches the stopping position of the ball each time.
A golf ball distance measuring method obtains all falling positions (X) from a service platform to a cup of each hole according to the golf ball positioning methods,Ys) Using the Pythagorean theorem in combination with the ball-falling position (X) of the s-th rod of the current holes,Ys) And ball-falling position (X) of the s-1 th bars-1,Ys-1) Calculating the hitting distance of the s-th club of the current hole and combining the position (X) of the hole cup of the current holec,Yc) Obtaining the ball falling position (X) of the s-th rod of the current holes,Ys) Position of hole cup (X)c,Yc) When s =1, the ball-falling position of the (s-1 = 0) th stick is the ball-serving position (X)t,Yt) When the s-th stick is the last stick of the current hole, its ball-falling position (X)s,Ys) Is the position of the hole cup (X)c,Yc)。
A server comprising a memory, a processor, and a golf ball locating program stored on the memory and executable on the processor, the golf ball locating program when executed by the processor implementing the steps of the golf ball locating method.
A computer readable storage medium having a golf ball locating program stored thereon, which when executed performs the steps of a golf ball locating method as described.
Further, there is a server, the server includes a memory, a processor and a golf ball ranging program stored in the memory and executable on the processor, the golf ball ranging program, when executed by the processor, implements the steps of the method for ranging a golf ball.
Further, there is a computer readable storage medium having a golf ball ranging program stored thereon, wherein the golf ball ranging program implements the steps of the golf ball ranging method when running.
By adopting the technical scheme of the invention, when measuring the hitting distance, the hitting and falling positions do not need to be confirmed by using a map of the whole court, but the hitting platform, the hole cup position and a plurality of sprinkling irrigation points of each hole which are accurately measured in advance are used as a starting anchor point, a middle anchor point and an ending anchor point, the closest anchor point is confirmed at the falling point, the moving direction of the current falling point and the moving distance relative to the closest anchor point are obtained by the moving track estimation function of the mobile equipment, and the falling position (X) of the falling point is converted by combining the absolute position data of the anchor points,Ys)。
When the ball falling position is calculated, the accurate absolute position data of the anchor point is utilized, and the position data of the current ball falling point relative to the nearest anchor point is acquired by combining the movement track estimation function of the mobile equipment, so that the superposition of errors in calculation can be greatly reduced.
Since the error increases with distance, if the center line of the fairway is used as the dividing line and only the start anchor and the end anchor are set, the longest distance between the falling ball on the non-green and the nearest anchor does not exceed 300 yards. If the precision error is 0.5%, the error is 1.5 codes, and the precision requirement is met. When the ball falling point of the s-th rod is positioned between the ball serving table and the center line of the lane, the moving direction of the ball falling point obtained in real time through the mobile equipment and the moving distance relative to the ball serving table are converted by combining the absolute position data of the starting anchor point to obtain the ball falling position (X) of the current ball falling points,Ys) When the falling ball point of the s-th rod is located between the center line of the fairway and the hole cup, the moving direction of the falling ball point and the moving distance relative to the hole cup which are obtained in real time through the mobile equipment are combined with the absolute position data of the ending anchor point to convert to obtain the falling ball position (X) of the current falling ball points,Ys) Therefore, the error from the central line of the fairway to the position of each ball falling point of the hole cup can be reduced. The same is true on the green, and the relative position of each ball stopped is calculated by the position of the hole cup.
Therefore, the invention can control the precision error to be about 1.5 codes, can replace satellite positioning data with the error precision exceeding five meters, and can replace electronic instrument ranging. If an intermediate anchor point is added between the ball serving table and the hole cup, one lane divides two areas, and the error can be reduced to 0.75 yards. If the measurement precision needs to be improved, at least one intermediate anchor point can be added as required, and when the intermediate anchor point is confirmed once, the movement track is estimated by taking the intermediate anchor point as an origin, the shorter the movement distance is, the higher the precision is, and the more accurate the ball falling position converted by combining with accurate absolute position data is.
Detailed Description
There are many different places for the golf game and the navigation while the vehicle is traveling. Although a round of play has 18 holes (7 km distance), there are several factors: (1) each hole is unrelated to each other; (2) the position and the distance from the ball serving platform to the hole cup of each hole are the positions and the distances of the court with accurate test data; (3) although people like to know the specific position of the ball on the map, for statistical purposes, only the distance between each hitting point and the hole cup needs to be known, and the interaction with the map is not needed; (4) while the distance on a green is accurate to 1 foot, green sizes are typically between 50 and 500 square meters or 500 and 5000 square feet; therefore, it can be determined that the measurement of the distance between the hitting position and the cup does not require the continuity of a large map in the golf game, and the distance measurement method with 2 yards precision between 100 and 600 yards can be adopted in the non-green area, and the distance measurement method with 1 foot precision between 1 and 100 feet can be adopted on the green (the green itself can be added with anchor points to increase the precision). Since the court is built with specific position data between the tee and the green, the exact distance of the tee and cup of 18 holes can be obtained by professional testing before the game. The present invention calls the anchor point the place where the precise position data is known in advance.
The accuracy error of the mobile device equipped with the gyroscope direction sensor, the three-axis speed sensor and the angle sensor is about 0.5%, and the error of the maximum distance of 100 feet on the green is 0.5 feet, so that the accuracy on the green meets the requirement. The error of the non-green maximum distance 600 codes is 3 codes, which does not meet the requirement of 2-code accuracy. Since the actual farthest distance of the ball serving of the player is usually located between the serving table and the hole cup and located at the front 1/2, namely the interval position of the middle line of the fairway close to the serving table, the maximum distance of the ball falling on a non-green is 300 yards, and if the accuracy error is 0.5%, the error is 1.5 yards, which meets the requirement. The camera continuously collects video streams in motion, and the moving distance of each frame of the ground object is calculated by combining the difference conditions of different frames and utilizing focusing, so that the method for estimating the moving track is more accurate than the method for calculating the moving track by performing inertial positioning based on a gyro three-axis sensor.
The invention relates to a golf ball positioning method, which comprises at least one positioning testThe positioning and ranging APP continuously obtains the real-time moving direction and moving distance of the handheld user through the moving track estimation function, the position where accurate position data are known in advance is called an anchor point, and the serve position (X) measured in advance is called the serving positiont,Yt) And position of hole cup (X)c,Yc) Set as a start anchor and an end anchor, the user holds the mobile device from the serving position (X) of the current holet,Yt) Move to the hole cup position (X)c,Yc) Continuously obtaining real-time moving direction and moving distance relative to all anchor points through the moving track estimation function of the mobile terminal, namely, the moving distance relative to a starting anchor point or an ending anchor point, confirming a current ball falling point through mobile equipment when a user arrives at a place where a ball stays, selecting the anchor point closest to the current ball falling point by the positioning and ranging APP, converting the ball falling position (X) of the current ball falling point by combining the moving direction of the current ball falling point obtained through the moving track estimation function and the moving distance relative to the anchor point closest to the anchor points,Ys)。
The mobile equipment movement track estimation function comprises (1) calculating and obtaining a movement track by inertial positioning through a gyro triaxial sensor, and providing a movement direction of any point on the movement track and a movement distance relative to a starting point; (2) the camera continuously collects video streams in motion, the moving distance of each frame of the ground object is measured and calculated by combining the difference conditions of different frames and utilizing focusing, so that the estimation of the moving track is realized, and the moving direction of any point on the moving track and the moving distance relative to a starting point can be provided. The function of estimating the moving track of the mobile device belongs to the prior art, and is not the design key point of the invention, and the details are not repeated here.
In the invention, accurate serving position and hole cup position data are known in advance and are used as a starting anchor point and an ending anchor point, the accurate position data can be obtained by accurate measurement when a court is built, can also be obtained by accurate satellite positioning instruments (for example, the error is within 0.5 meter) in advance, or can be obtained by Bluetooth beacon positioning, and the mode of obtaining the accurate position data belongs to the prior art, is not the design key point of the invention, and is not described in detail herein.
If an anchor point is added between a start anchor point and an end anchor point, a lane is divided into two areas, the precision error can be reduced to 0.75 code, and so on, the invention can add one or more anchor points between the start anchor point and the end anchor point, when the middle anchor point is approached, a user confirms the anchor point on mobile equipment, background reads the position data pre-stored by the anchor point, a moving track taking the anchor point as a starting point is formed subsequently, the sprinkling irrigation point in the lane is generally selected as the middle anchor point arranged in the lane, the code number of the anchor point away from the green can be written on the existing sprinkling irrigation cover, therefore, the sprinkling irrigation point is also the point which is accurately positioned and can be used as the anchor point of the invention.
The present invention is a server comprising a memory, a processor, and a golf ball locating program stored on the memory and executable on the processor, the golf ball locating program when executed by the processor implementing the steps of the golf ball locating method.
The present invention is a computer readable storage medium having a golf ball locating program stored thereon, the golf ball locating program when executed implementing the steps of the golf ball locating method.
The invention is based on the distance measuring method of golf positioning, and all falling positions (X) between a service table and a hole cup of each hole are obtained by the positioning methods,Ys) Using the Pythagorean theorem in combination with the ball-falling position (X) of the s-th rod of the current holes,Ys) And ball-falling position (X) of the s-1 th bars-1,Ys-1) Calculating the hitting distance of the s-th club of the current hole and combining the position (X) of the hole cup of the current holec,Yc) Obtaining the ball falling position (X) of the s-th rod of the current holes,Ys) Position of hole cup (X)c,Yc) When s =1, the ball-falling position of the s-1 th stick is the ball-serving position (X)t,Yt) When the s-th pole is the last pole of the current hole, it fallsBall position (X)s,Ys) Is the position of the hole cup (X)c,Yc)。
The present invention may also be a server including a memory, a processor, and a golf ball ranging program stored on the memory and executable on the processor, the golf ball ranging program implementing the steps of the golf ball ranging method when executed by the processor.
The present invention may also be a computer-readable storage medium having a golf ball ranging program stored thereon, the golf ball ranging program implementing the steps of the golf ball ranging method when being executed.
The invention relates to a golf positioning method, which is characterized in that a place with a known accurate position in advance is called an anchor point, and the service position (X) of a current hole service table obtained in advance is used as a service positiont,Yt) And position of hole cup (X)c,Yc) Setting a starting anchor point and an ending anchor point, and setting at least one intermediate anchor point in the lane, wherein the method specifically comprises the following positioning steps:
step 1, before a user (such as a player/a caddie) drives a ball on a serving table, the serving table of a current hole is confirmed through a mobile device, for example, the serving table of a few holes is selected, and a preset serving position (X) of the current hole is located and measured by a positioning and distance measuring APPt,Yt) As the origin of the coordinate system, starting a motion trajectory estimation function, which may be a motion trajectory obtained by inertial positioning using a gyro three-axis sensor, or a motion trajectory obtained by continuously collecting video streams in motion using a camera and performing focus measurement on different frames, or other ways capable of obtaining a motion trajectory, and acquiring the motion direction of the current position in real time and the motion distance relative to all anchor points in the motion trajectory estimation process;
step 2, the handheld mobile device continuously operates the motion track estimation function from the ball serving table of the current hole to the hole cup of the green, the position where the ball stops or the position of the middle anchor point is reached each time, and the user is positioned above the ball or close to the middle anchor point on the mobile deviceThe positioning and ranging APP determines the current ball-drop point or the intermediate anchor point, for example, clicking the corresponding position of the user interface of the positioning and ranging APP, and the positioning and ranging APP calculates the ball-drop position (X) of the current ball-drop points,Ys) Selecting the anchor point position data closest to the current ball drop point, and combining the moving direction of the current ball drop point provided by the moving track estimation function and the moving distance relative to the closest anchor point to calculate the ball drop position (X) of the current ball drop points,Ys) If the nearest anchor point is the end anchor point, the ball falling position (X) of the current ball falling points,Ys) The user can only back calculate the moving distance relative to the end anchor point after reaching the hole cup, and then the falling ball position (X) of the current falling ball point is converteds,Ys)。
The user can confirm the current ball drop point above the ball drop, and can also confirm the landform conditions of the ball drop point in the positioning and ranging APP, such as fairways, long grass, deep grass, obstacles, sand pits, pools, greens, out-of-bounds, and whether the ball is lost.
The invention is characterized in that: when measuring the hitting distance, the hitting and falling positions are not required to be confirmed by using a map of the whole court, but the hitting platform, the hole cup position and a plurality of sprinkling irrigation points of each hole which are accurately measured in advance are used as a starting anchor point, a middle anchor point and an ending anchor point, the closest anchor point is confirmed at the falling point, the moving direction of the current falling point and the moving distance relative to the closest anchor point are obtained by the moving track estimation function of the mobile equipment, and the falling position (X) of the falling point is converted by combining the absolute position data of the anchor pointss,Ys). When the ball falling position is calculated, the accurate absolute position data of the anchor point is utilized, and the position data of the current ball falling point relative to the nearest anchor point is acquired by combining the movement track estimation function of the mobile equipment, so that the superposition of errors in calculation can be greatly reduced.
Since the error increases with distance, if the center line of the fairway is used as the dividing line and only the start anchor and the end anchor are set, the longest distance between the falling ball on the non-green and the nearest anchor does not exceed 300 yards. If the precision errorAnd if 0.5 percent, the error is 1.5 codes, and the precision requirement is met. When the ball falling point of the s-th rod is positioned between the ball serving table and the center line of the lane, the moving direction of the ball falling point obtained in real time through the mobile equipment and the moving distance relative to the ball serving table are converted by combining the absolute position data of the starting anchor point to obtain the ball falling position (X) of the current ball falling points,Ys) When the falling ball point of the s-th rod is located between the center line of the fairway and the hole cup, the moving direction of the falling ball point and the moving distance relative to the hole cup which are obtained in real time through the mobile equipment are combined with the absolute position data of the ending anchor point to convert to obtain the falling ball position (X) of the current falling ball points,Ys) Therefore, the error from the central line of the fairway to the position of each ball falling point of the hole cup can be reduced. The same is true on the green, and the relative position of each ball stopped is calculated by the position of the hole cup. If the measurement precision needs to be improved, at least one intermediate anchor point can be added as required, and when the intermediate anchor point is confirmed once, the movement track is subsequently estimated by taking the intermediate anchor point as an origin, the shorter the movement distance is, the higher the precision is, and the more accurate the ball falling position converted by combining with accurate absolute position data is.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The client of the invention can be in the form of a computer program product based on implementation of cloud processing and storage space, the client can be a wearable terminal such as glasses and watches, and the display part of the terminal can be laser projection or glass of a ball car.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory. The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium. Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above description is only an example of the present invention, and is not intended to limit the present invention. Various modifications and alterations to this invention will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement or the like made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A golf positioning method is characterized in that the method comprises at least one mobile device equipped with positioning and ranging APP, the mobile terminal has a mobile track estimation function, and positioning and ranging APP is arranged on the mobile terminalContinuously obtaining the real-time moving direction and moving distance of the handheld user from the APP through the moving track estimation function, calling the site with accurate position data known in advance as an anchor point, and measuring the serve position (X) in advancet,Yt) And position of hole cup (X)c,Yc) Set as a start anchor and an end anchor, the user holds the mobile device from the serving position (X) of the current holet,Yt) Move to the hole cup position (X)c,Yc) Continuously obtaining real-time moving direction and moving distance relative to all anchor points through the moving track estimation function, confirming a current ball falling point through a mobile device when a user arrives at a place where a ball stays, confirming an anchor point closest to the current ball falling point through a positioning and ranging APP, converting the moving direction of the current ball falling point and the moving distance relative to the anchor point closest to the current ball falling point through the moving track estimation function according to position data of the anchor point, and calculating the ball falling position (X) of the current ball falling points,Ys)。
2. A method of locating a golf ball according to claim 1, wherein: and adding at least one intermediate anchor point between the start anchor point and the end anchor point.
3. The method of positioning a golf ball according to any one of claims 1 and 2, wherein: the motion track estimation function is to calculate and obtain the motion track by inertial positioning through a gyro triaxial sensor.
4. The method of positioning a golf ball according to any one of claims 1 and 2, wherein: the motion track estimation function is to continuously acquire video streams in motion through a camera, combine difference conditions of different frames and measure the motion distance of each frame of the ground object by utilizing focusing, thereby realizing the estimation of the motion track.
5. The method of positioning a golf ball according to any one of claims 1 and 2, wherein: before a user drives a ball on the ball serving table, the user firstly confirms the serving of the current hole through the mobile equipmentTable, location and distance APP Preset current hole serving position (X)t,Yt) And as the origin of a coordinate system, starting a movement track estimation function at the same time, continuously operating the movement track estimation function by the handheld mobile equipment between the serving table of the current hole and the hole cup of the green, and confirming the current ball falling point at the positioning distance measuring APP of the mobile equipment by the user at the position above the ball when the user reaches the stopping position of the ball each time.
6. A distance measuring method of golf ball, obtaining all falling positions (X) from a tee to a cup per hole according to the golf ball positioning method of any one of claims 1 to 5s,Ys) The method is characterized in that: using Pythagorean theorem in combination with the ball-falling position (X) of the s-th rod of the current holes,Ys) And ball-falling position (X) of the s-1 th bars-1,Ys-1) Calculating the hitting distance of the s-th club of the current hole and combining the position (X) of the hole cup of the current holec,Yc) Obtaining the ball falling position (X) of the s-th rod of the current holes,Ys) Position of hole cup (X)c,Yc) When s =1, the ball-falling position of the (s-1 = 0) th stick is the ball-serving position (X)t,Yt) When the s-th stick is the last stick of the current hole, its ball-falling position (X)s,Ys) Is the position of the hole cup (X)c,Yc)。
7. A server, characterized in that the server comprises a memory, a processor and a golf ball locating program stored on the memory and executable on the processor, the golf ball locating program when executed by the processor implementing the steps of the golf ball locating method according to any one of claims 1 to 5.
8. A computer-readable storage medium, having a golf ball locating program stored thereon, which when executed performs the steps of the golf ball locating method according to any one of claims 1 to 5.
9. A server, characterized in that the server comprises a memory, a processor and a golf ball ranging program stored on the memory and executable on the processor, the golf ball ranging program, when executed by the processor, implementing the steps of the golf ball ranging method according to claim 6.
10. A computer-readable storage medium, on which a ranging program of a golf ball is stored, which when executed, implements the steps of the ranging method of a golf ball according to claim 6.
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| KR102253298B1 (en) * | 2020-06-29 | 2021-05-20 | 주식회사 크리에이티브솔루션 | Measuring apparatus for golf putting line |
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- 2021-12-14 CN CN202111522880.5A patent/CN114295125A/en active Pending
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| KR102215037B1 (en) * | 2020-07-06 | 2021-02-10 | 박주환 | System and apparatus to provide distance measurement for golf |
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