A frequency conversion timing test system and method for sprint events

Abstract

This application discloses a frequency-modulated timing test system and method for sprint events, including a wireless starter, an infrared finish line detection device, a central control unit, and a display device. The infrared finish line detection device is fixedly installed at the finish line of the track, while the central control unit and display device are fixedly installed at the referee's stand. Each of the wireless starter, infrared finish line detection device, central control unit, and display device is equipped with a 2.4G wireless communication module and a 433M wireless communication module. During communication, when the number of communication failures due to interference in any frequency band reaches a preset threshold, the system automatically switches to another frequency band for retransmission, thereby effectively avoiding interference, significantly reducing the probability of communication failure, ensuring the real-time and reliable delivery of key commands, and thus guaranteeing the accuracy of timing and the fairness of the test.

Description

Technical Field

[0001] This application relates to the field of sports equipment technology, specifically to a frequency conversion timing test system and method for sprint events. Background Technology

[0002] Sprint timing devices are widely used in physical fitness assessments in schools, fire departments, and competitions to accurately collect candidates' 50-meter or 100-meter sprint times. Currently, mainstream solutions on the market generally employ "infrared photoelectric detection + wireless communication" technology. The starting signal is given by a starter, and the infrared sensor automatically triggers when the athlete crosses the finish line. Real-time wireless data transmission occurs between the central control unit, the starter, and the infrared detection device, replacing manual timing and saving manpower while avoiding human error.

[0003] In terms of wireless communication, existing sprint timing testing devices mainly use two frequency bands:

[0004] 2.4 GHz band: This band is shared with common wireless devices such as Wi-Fi and Bluetooth, and is easily subject to interference;

[0005] The 433 MHz band is commonly used in devices such as walkie-talkies and car remote keys, and it also poses a risk of co-channel interference.

[0006] In real-world testing environments, the problems are particularly pronounced: sports venues are densely populated, with a wide variety of uncontrollable electronic devices on the vehicles; some examination rooms even use Wi-Fi signal jammers to prevent cheating. These factors can all seriously affect the stability and reliability of single-band wireless communication.

[0007] Sprint timing demands extremely high real-time performance and precision—times need to be accurate to 0.01 seconds. If communication is interrupted due to interference, even if the retransmission is successful only after a delay of one or two seconds, the obtained time will have lost its competitive fairness and validity.

[0008] Therefore, existing solutions relying on a single communication frequency band cannot guarantee the timely and accurate transmission of timing data in complex electromagnetic environments, and a more reliable communication strategy is urgently needed to improve system robustness. Summary of the Invention

[0009] Therefore, this application provides a frequency conversion timing test system for sprint events to solve the problem of unstable or inaccurate timing caused by existing sprint timing test devices relying on a single communication frequency band.

[0010] To achieve the above objectives, this application provides the following technical solution:

[0011] In the first aspect, a frequency conversion sprint timing test system includes a wireless starter, an infrared finish line detection device, a central control unit and a display device. The infrared finish line detection device is fixedly installed at the finish line of the track, and the central control unit and the display device are fixedly installed at the referee's stand.

[0012] The wireless transmitter includes a first microcontroller and a trigger module, an audio-visual generation module, a first 2.4G wireless communication module, and a first 433M wireless communication module electrically connected to the first microcontroller; the infrared cross-traffic detection device includes a second microcontroller and a second 2.4G wireless communication module, a second 433M wireless communication module, and an infrared detection module electrically connected to the second microcontroller; the display device includes a third microcontroller and a third 2.4G wireless communication module, a third 433M wireless communication module, and a display screen electrically connected to the third microcontroller; the central control unit includes a central processing unit and a fourth 2.4G wireless communication module, a fourth 433M wireless communication module, and a voice broadcast module electrically connected to the central processing unit.

[0013] The central control unit establishes a first wireless communication link with the first, second, and third 2.4G wireless communication modules through the fourth 2.4G wireless communication module, and simultaneously establishes a second wireless communication link with the first, second, and third 433M wireless communication modules through the fourth 433M wireless communication module.

[0014] During operation, the wireless transmitter and the infrared cross-traffic detection device transmit data through the first wireless communication link or the second wireless communication link; if no response is received from the central control host within a preset time, the system automatically switches to the second wireless communication link or the first wireless communication link to retransmit; the central control host simultaneously monitors the first wireless communication link and the second wireless communication link, and responds to the data received first on either link.

[0015] Preferably, the infrared detection module includes a through-beam infrared emitter and an infrared receiver, which are respectively installed on both sides of the finish line of the track to form one or more horizontal infrared light curtains.

[0016] Preferably, the display screen is a high-brightness LED digital tube or a full-color LED dot matrix screen, used to display the match time, segment scores, or foul prompts in real time.

[0017] Preferably, the first microcontroller, the second microcontroller, the third microcontroller, and the central processing unit all have built-in high-precision real-time clocks, and are periodically synchronized wirelessly through the central control host.

[0018] Preferably, the central control unit further includes a storage module, which is electrically connected to the central processing unit and is used to record the starting time of each race, the finish time of each lane, communication logs and final results, and supports data export via wired or wireless means.

[0019] Preferably, the central control unit further includes a network communication module, which is electrically connected to the central processing unit and is used to realize data interaction between the central control unit and external devices or systems.

[0020] Preferably, the first, second, third, and fourth 2.4G wireless communication modules all adopt the IEEE 802.15.4 protocol or a proprietary frequency hopping protocol; the first, second, third, and fourth 433M wireless communication modules all adopt FSK modulation and operate in the civilian unlicensed frequency band of 433.05 to 434.79 MHz.

[0021] Secondly, a method for timing tests of variable frequency sprint events, the method being applied to the aforementioned variable frequency sprint event timing test system, comprising:

[0022] The wireless transmitter responds to user commands, outputs voice signals according to user commands, and simultaneously sends a start signal to the central control host through the first 2.4G wireless communication module;

[0023] If the wireless transmitter does not receive a response signal from the central control host within a preset time, it will immediately switch to the first 433M wireless communication module to resend the start signal to the central control host.

[0024] After receiving the start signal, the central control unit sends a response signal to the wireless transmitter and starts the timer at the same time;

[0025] The infrared finish line detection device detects the athlete's finish line signal in real time. When the finish line signal is detected, it immediately sends the finish line signal to the central control host through the second 2.4G wireless communication module.

[0026] If the infrared lap detection device does not receive a response signal from the central control host within a preset time, it will immediately switch to the second 433M wireless communication module to resend the lap signal to the central control host.

[0027] After receiving the finish line signal, the central control unit sends a response signal to the infrared finish line detection device, stops the timing, and pushes the athlete's final score to the display device.

[0028] Preferably, the preset time precision is set to the millisecond level.

[0029] Preferably, after the wireless transmitter switches to the first 433M wireless communication module to resend the start signal to the central control host, if the wireless transmitter still does not receive a response signal from the central control host within a preset time, it will continue to switch to the first 2.4G wireless communication module to resend the start signal to the central control host, and so on, until 10 milliseconds have elapsed.

[0030] After the infrared lap detection device switches to the second 433M wireless communication module to resend the lap signal to the central control host, if the infrared lap detection device still does not receive a response signal from the central control host within a preset time, it will continue to switch to the second 2.4G wireless communication module to resend the start signal to the central control host. This cycle continues until 10 milliseconds have elapsed.

[0031] Compared with the prior art, this application has at least the following beneficial effects:

[0032] This application provides a frequency-modulated timing test system for sprint events, including a wireless starter, an infrared finish line detection device, a central control unit, and a display device. The infrared finish line detection device is fixedly installed at the finish line of the track, while the central control unit and display device are fixedly installed at the referee's stand. Each of the wireless starter, infrared finish line detection device, central control unit, and display device is equipped with a 2.4G wireless communication module and a 433M wireless communication module. During communication, when the number of communication failures due to interference on any frequency band reaches a preset threshold, the system automatically switches to another frequency band for retransmission. This effectively avoids interference, significantly reduces the probability of communication failure, and ensures the real-time and reliable delivery of key commands, thereby guaranteeing the accuracy and stability of timing, as well as the fairness of the test. Attached Figure Description

[0033] To more intuitively illustrate the prior art and this application, exemplary drawings are provided below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing this application; for example, based on the technical concept disclosed in this application and the exemplary drawings, those skilled in the art are able to easily make conventional adjustments or further optimizations to the addition / reduction / classification, specific shapes, positional relationships, connection methods, size ratios, etc. of certain units (components).

[0034] Figure 1 This is a schematic diagram illustrating the structural principle of a frequency conversion timing test system for sprint events provided in Embodiment 1 of this application;

[0035] Figure 2 This is a schematic diagram of wireless communication link switching for a frequency conversion sprint timing test system provided in Embodiment 1 of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Wireless transmitter; 101. First microcontroller; 102. Trigger module; 103. Sound and light generation module; 104. First 2.4G wireless communication module; 105. First 433M wireless communication module; 2. Infrared cross-traffic detection device; 201. Second microcontroller; 202. Second 2.4G wireless communication module; 203. Second 433M wireless communication module; 204. Infrared detection module; 3. Display device; 301. Third microcontroller; 302. Third 2.4G wireless communication module; 303. Third 433M wireless communication module; 304. Display screen; 4. Central control host; 401. Central processing unit; 402. Fourth 2.4G wireless communication module; 403. Fourth 433M wireless communication module; 404. Voice broadcast module; 405. Storage module; 406. Network communication module. Detailed Implementation

[0038] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] In the description of this application: unless otherwise stated, "a plurality of" means two or more. The terms "first," "second," "third," etc., in this application are intended to distinguish the objects referred to and do not have any special meaning in terms of technical connotation (e.g., they should not be construed as an emphasis on importance or order). Expressions such as "including," "comprising," and "having" also mean "not limited to" (certain units, components, materials, steps, etc.).

[0040] The terms used in this application, such as "upper," "lower," "left," "right," and "middle," are generally used to indicate the general relative positional relationship for the purpose of intuitive understanding by referring to the accompanying drawings, and are not absolute limitations on the positional relationship in the actual product.

[0041] Example 1

[0042] Please see Figure 1 This embodiment provides a frequency conversion sprint timing test system, including a wireless starter 1, an infrared finish line detection device 2, a display device 3, and a central control unit 4. The wireless starter 1, the infrared finish line detection device 2, the display device 3, and the central control unit 4 are all independent units. The infrared finish line detection device 2 is fixedly installed at the finish line of the track, and the central control unit 4 and the display device 3 are fixedly installed at the referee's stand.

[0043] The wireless transmitter 1 includes a first microcontroller 101, a trigger module 102, an audio-visual generator module 103, a first 2.4G wireless communication module 104, and a first 433M wireless communication module 105. The trigger module 102, the audio-visual generator module 103, the first 2.4G wireless communication module 104, and the first 433M wireless communication module 105 are all electrically connected to the first microcontroller 101.

[0044] The infrared punching detection device 2 includes a second microcontroller 201, a second 2.4G wireless communication module 202, a second 433M wireless communication module 203, and an infrared detection module 204. The second 2.4G wireless communication module 202, the second 433M wireless communication module 203, and the infrared detection module 204 are all electrically connected to the second microcontroller 201.

[0045] The display device 3 includes a third microcontroller 301, a third 2.4G wireless communication module 302, a third 433M wireless communication module 303, and a display screen 304. The third 2.4G wireless communication module 302, the third 433M wireless communication module 303, and the display screen 304 are all electrically connected to the third microcontroller 301.

[0046] The central control unit 4 includes a central processing unit 401, a fourth 2.4G wireless communication module 402, a fourth 433M wireless communication module 403, and a voice broadcast module 404. The fourth 2.4G wireless communication module 402, the fourth 433M wireless communication module 403, and the voice broadcast module 404 are all electrically connected to the central processing unit 401.

[0047] In the frequency conversion sprint timing test system provided in this embodiment, the central control host 4 establishes a first wireless communication link with the first 2.4G wireless communication module 104, the second 2.4G wireless communication module 202, and the third 2.4G wireless communication module 302 through the fourth 2.4G wireless communication module 402, and simultaneously establishes a second wireless communication link with the first 433M wireless communication module 105, the second 433M wireless communication module 203, and the third 433M wireless communication module 303 through the fourth 433M wireless communication module 403.

[0048] Please see Figure 2 In this embodiment, a frequency conversion sprint timing test system is provided. When the system is working, the wireless starter 1 and the infrared finish line detection device 2 send data through the first wireless communication link or the second wireless communication link. If no response is received from the central control host 4 within a preset time, the system automatically switches to the second wireless communication link or the first wireless communication link to resend the data. The central control host 4 simultaneously monitors the first wireless communication link and the second wireless communication link and responds to the data received first on either link.

[0049] It should be noted that in this application, when the central control host 4 is in the receiving state, both communication links are in the monitoring state (simultaneous monitoring is not contradictory), and whichever link receives first will initiate an interruption first.

[0050] In the frequency conversion sprint timing test system provided in this application, the wireless starter 1, the infrared finish line detection device 2, the display device 3, and the central control host 4 are all configured with unique communication addresses in the software. The communication data frame contains source address and destination address fields. The receiving end decides whether to process the data frame based on the destination address, thereby realizing communication isolation and precise control under multi-device collaboration.

[0051] In the frequency conversion timing test system for sprint events provided in this application, the first 2.4G wireless communication module 104, the second 2.4G wireless communication module 202, the third 2.4G wireless communication module 302, and the fourth 2.4G wireless communication module 402 all adopt the IEEE 802.15.4 protocol or a proprietary frequency hopping protocol; the first 433M wireless communication module 105, the second 433M wireless communication module 203, the third 433M wireless communication module 303, and the fourth 433M wireless communication module 403 all adopt FSK modulation and operate in the civilian unlicensed frequency band from 433.05 to 434.79 MHz.

[0052] In the frequency conversion sprint timing test system provided in this embodiment, the preset time threshold is 2 milliseconds; if no response signal is received from the central control host 4 within 2 milliseconds, the current communication device will immediately switch to another frequency band to retransmit the data.

[0053] In a frequency conversion sprint timing test system provided in this application, the infrared detection module 204 includes a through-beam infrared emitter and an infrared receiver. The infrared emitter and the infrared receiver are respectively installed on both sides of the finish line of the track to form one or more horizontal infrared light curtains.

[0054] In the frequency conversion timing test system for sprint events provided in this application, the display screen 304 is a high-brightness LED digital tube or a full-color LED dot matrix screen, used to display the race time, split scores or foul prompts in real time.

[0055] In the frequency conversion sprint event timing test system provided in this application, the first microcontroller 101, the second microcontroller 201, the third microcontroller 301 and the central processing unit 401 are all equipped with high-precision real-time clocks, and are periodically synchronized wirelessly through the central control host 4.

[0056] In the frequency conversion sprint timing test system provided in this application, the central control host 4 also includes a storage module 405, which is electrically connected to the central processing unit 401. The storage module 405 is used to record the starting time of each race, the crossing time of each lane, the communication log and the final result, and supports data export via wired or wireless means.

[0057] In the frequency conversion sprint event timing test system provided in this application, the central control host 4 further includes a network communication module 406, which is electrically connected to the central processing unit 401 and is used to realize data interaction between the central control host 4 and external devices or systems.

[0058] The workflow of the frequency conversion timing test system for sprint events provided in this application is as follows:

[0059] Step 1: Starting Phase; The referee presses the trigger button on wireless starter 1, and wireless starter 1 immediately:

[0060] Simultaneously issue starting voice prompts (such as "On your marks - Get set - Bang!") and flashing signals for athletes to perceive;

[0061] It sends a "start-up" signal containing a unique device address to the central control host 4 through its built-in first 2.4G wireless communication module 104 (priority channel);

[0062] If the 2.4G signal is not acknowledged within a preset time (e.g., 2 milliseconds), the system will automatically switch to the first 433M wireless communication module 105 to retransmit the signal.

[0063] Step 2: Timing Start; After the central control unit 4 receives a valid "start" signal:

[0064] Start the high-precision timer immediately (accuracy up to 0.01 seconds);

[0065] Optionally, trigger audio-visual feedback or voice announcement "The match has started";

[0066] Entering the waiting state for the finish line signal.

[0067] Step 3: Finish line detection; When the athlete crosses the finish line, the infrared beam of the infrared finish line detection device 2 is blocked.

[0068] The infrared detection module 204 detects the beam interruption in real time and generates a "crossing the finish line event";

[0069] The second microcontroller 201 captures the precise moment of crossing the finish line (based on a time reference synchronized with the central control host 4).

[0070] The second 2.4G wireless communication module 202 sends a "crossing signal" containing track number information and a timestamp to the central control host 4;

[0071] If 2.4G communication fails, it will automatically switch to the second 433M wireless communication module 203 for retransmission.

[0072] Step 4: Timing End and Data Processing; After the central control unit 4 receives a valid finish line signal:

[0073] Immediately stop timing for the corresponding track.

[0074] Calculate the final result (time to cross the finish line - time to start).

[0075] The score data is stored in the local storage module 405;

[0076] The final score is pushed to the display device 3 via the wireless link of the fourth 2.4G wireless communication module 402 or the fourth 433M wireless communication module 403 (which also has dual-frequency redundancy).

[0077] Step 5: Result Display. After receiving the score data, display device 3:

[0078] Verify the communication address and verification information;

[0079] The results of the corresponding lane (e.g., "Lane 1: 12.34s") are updated and highlighted in real time on LED display screen 304.

[0080] Optionally, trigger audio-visual prompts or scrolling announcements.

[0081] This application provides a frequency conversion timing test system for sprint events, which employs wireless frequency conversion communication technology to realize data interaction between the wireless starter 1, the infrared finish line detection device 2, the display device 3, and the central control host 4. Each communication link is equipped with dual-band channels of 2.4G and 433M. When any device fails to communicate continuously in the current frequency band for a preset threshold (e.g., set to 3 times, if no response signal is received after 3 attempts to initiate information transmission), it automatically switches to another frequency band to retry. The end-to-end transmission delay of any communication process is controlled within 10 milliseconds, preferably not exceeding 10 milliseconds, to meet the real-time requirements of 0.01-second timing for sprint events. This application provides a frequency conversion timing test system for sprint events, employing dual-frequency conversion communication technology. It configures each device in the system with two independent wireless communication frequency bands: 2.4GHz and 433MHz, and monitors data transmission status in real time. When the number of communication failures due to interference on either frequency band reaches a preset threshold, the system automatically switches to the other frequency band for retransmission, effectively avoiding interference, significantly reducing the probability of communication failure, and ensuring the real-time and reliable delivery of critical instructions (such as starting signals, crossing the finish line, and result notifications). Compared to single-frequency communication schemes, this application achieves adaptive anti-interference capabilities in complex electromagnetic environments through a dynamic frequency band switching mechanism.

[0082] This application provides a frequency conversion timing test system for sprint events, applicable to 50-meter, 100-meter, and firefighter 100-meter obstacle course events, which can ensure the fairness of the test.

[0083] Example 2

[0084] This embodiment provides a variable frequency sprint timing test method, which is applied to a variable frequency sprint timing test system provided in Embodiment 1, including:

[0085] The wireless transmitter responds to user commands, outputs voice signals according to user commands, and simultaneously sends a start signal to the central control host through the first 2.4G wireless communication module;

[0086] If the wireless transmitter does not receive a response signal from the central control host within a preset time, it will immediately switch to the first 433M wireless communication module to resend the start signal to the central control host.

[0087] After receiving the start signal, the central control unit sends a response signal to the wireless transmitter and starts the timer at the same time;

[0088] The infrared finish line detection device detects the athlete's finish line signal in real time. When the finish line signal is detected, it immediately sends the finish line signal to the central control host through the second 2.4G wireless communication module.

[0089] If the infrared lap detection device does not receive a response signal from the central control host within a preset time, it will immediately switch to the second 433M wireless communication module to resend the lap signal to the central control host.

[0090] After receiving the finish line signal, the central control unit sends a response signal to the infrared finish line detection device, stops the timing, and pushes the athlete's final score to the display device.

[0091] In the frequency conversion sprint timing test method provided in this embodiment, the preset time accuracy is set to the millisecond level, that is, the preset time range is from 1 millisecond to 10 milliseconds.

[0092] In the frequency conversion timing test method for sprint events provided in this embodiment, after the wireless starter switches to the first 433M wireless communication module to resend the start signal to the central control host, if the wireless starter still does not receive a response signal from the central control host within a preset time, it continues to switch to the first 2.4G wireless communication module to resend the start signal to the central control host. This cycle continues until 10 milliseconds have elapsed. Because sprint events require high time accuracy, exceeding 10 milliseconds has a significant impact on the athlete's performance. Therefore, it is not recommended to exceed 10 milliseconds.

[0093] Similarly, after the infrared line-crossing detection device switches to the second 433M wireless communication module to resend the line-crossing signal to the central control host, if the infrared line-crossing detection device still does not receive a response signal from the central control host within a preset time, it will continue to switch to the second 2.4G wireless communication module to resend the start signal to the central control host, and so on, until 10 milliseconds have elapsed.

[0094] For specific limitations regarding the timing test method for variable frequency sprint events, please refer to the above description of the specific limitations of each module in a timing test system for variable frequency sprint events, which will not be repeated here.

[0095] The technical features of the above embodiments can be combined in any way (as long as there is no contradiction in the combination of these technical features). For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described; these embodiments not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A variable frequency sprint type event timing test system, characterized by, Including wireless starter, infrared dash line detection device, central control host and display device, the infrared dash line detection device is fixedly arranged at the track terminal point, and the central control host and the display device are fixedly arranged at the referee seat; The wireless starter includes a first microcontroller and a trigger module, an audible and visual generation module, a first 2.4G wireless communication module and a first 433M wireless communication module electrically connected with the first microcontroller; the infrared dash line detection device includes a second microcontroller and a second 2.4G wireless communication module, a second 433M wireless communication module and an infrared detection module electrically connected with the second microcontroller; the display device includes a third microcontroller and a third 2.4G wireless communication module, a third 433M wireless communication module and a display screen electrically connected with the third microcontroller; and the central control host includes a central processor and a fourth 2.4G wireless communication module, a fourth 433M wireless communication module and a voice broadcast module electrically connected with the central processor; The central control host establishes a first wireless communication link with the first 2.4G wireless communication module, the second 2.4G wireless communication module and the third 2.4G wireless communication module through the fourth 2.4G wireless communication module, and simultaneously establishes a second wireless communication link with the first 433M wireless communication module, the second 433M wireless communication module and the third 433M wireless communication module through the fourth 433M wireless communication module; In operation, the wireless starter and the infrared dash line detection device send data through the first wireless communication link or the second wireless communication link; if no response from the central control host is received within a preset time, the wireless starter and the infrared dash line detection device automatically switch to the second wireless communication link or the first wireless communication link to resend data; and the central control host simultaneously listens to the first wireless communication link and the second wireless communication link and responds to the data received first on any link.

2. The variable frequency sprint event timing test system according to claim 1, wherein, The infrared detection module includes a pair of infrared emitter tubes and infrared receiver tubes, and the infrared emitter tubes and the infrared receiver tubes are respectively installed on both sides of the track terminal line to form one or more horizontal infrared light curtains.

3. The variable frequency sprint event timing test system according to claim 1, wherein, The display screen is a high-brightness LED nixie tube or a full-color LED dot matrix screen for displaying competition time, segmented results or penalty prompt information in real time.

4. The variable frequency sprint event timing test system of claim 1, wherein, The first microcontroller, the second microcontroller, the third microcontroller and the central processor all have high-precision real-time clocks built-in and perform wireless time synchronization through the central control host regularly.

5. The variable frequency sprint event timing test system of claim 1, wherein, The central control host further includes a storage module electrically connected with the central processor for recording starting time of each competition, dash line time of each stage, communication log and final results and supporting data export through wired or wireless mode.

6. The variable frequency sprint event timing test system of claim 1, wherein, The central control host further includes a network communication module electrically connected with the central processor for realizing data interaction between the central control host and external devices or systems.

7. The variable frequency sprint event timing test system of claim 1, wherein, The first 2.4G wireless communication module, the second 2.4G wireless communication module, the third 2.4G wireless communication module and the fourth 2.4G wireless communication module all adopt IEEE 802.15.4 protocol or private frequency hopping protocol; the first 433M wireless communication module, the second 433M wireless communication module, the third 433M wireless communication module and the fourth 433M wireless communication module all adopt FSK modulation mode and work in 433.05-434.79 MHz civilian unlicensed frequency band.

8. A variable frequency short race type event timing test method, characterized by, The method is applied to the variable-frequency short-distance sprint project timing test system in any one of claims 1-7, and comprises the following steps: The wireless starter responds to the user instruction, outputs the voice signal according to the user instruction, and sends a start signal to the central control host through the first 2.4G wireless communication module; If the wireless starter does not receive the response signal from the central control host within a preset time, the wireless starter switches to the first 433M wireless communication module to resend the start signal to the central control host; After receiving the start signal, the central control host sends a response signal to the wireless starter and starts timing; The infrared finish line detection device detects the finish line signal of the athlete in real time, and sends a finish line signal to the central control host through the second 2.4G wireless communication module when the finish line signal is detected; If the infrared finish line detection device does not receive the response signal from the central control host within a preset time, the infrared finish line detection device switches to the second 433M wireless communication module to resend the finish line signal to the central control host; After receiving the finish line signal, the central control host sends a response signal to the infrared finish line detection device, ends timing, and pushes the final result of the athlete to the display device.

9. The variable frequency sprint event timing test method according to claim 8, wherein, The preset time accuracy is set to millisecond level.

10. The variable frequency sprint event timing test method according to claim 8, wherein, After the wireless starter switches to the first 433M wireless communication module to resend the start signal to the central control host, if the wireless starter still does not receive the response signal from the central control host within a preset time, the wireless starter continues to switch to the first 2.4G wireless communication module to resend the start signal to the central control host, and the process is repeated until 10 milliseconds are up. After the infrared finish line detection device switches to the second 433M wireless communication module to resend the finish line signal to the central control host, if the infrared finish line detection device still does not receive the response signal from the central control host within a preset time, the infrared finish line detection device continues to switch to the second 2.4G wireless communication module to resend the start signal to the central control host, and the process is repeated until 10 milliseconds are up.

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