A swimming timing system based on Beidou time calibration

Abstract

The invention relates to the field of swimming timing system design, and in particular to a swimming timing system based on Beidou time calibration. The invention provides a Beidou calibration module, a visual monitoring module, a time domain analysis module and a calibration correction module. The Beidou calibration module receives a time signal and calibrates a timer. The visual monitoring module collects images of a starting point and an end point area and monitors signal characteristics at the same time. The time domain analysis module identifies whether a feature calibration standard is met according to the relative position relationship between a human body contour feature and a starting point or an end point area. The calibration correction module adaptively controls the Beidou calibration module to calibrate the timer based on a determination result. Through the above process, the invention ensures the stability and accuracy of Beidou time signal transmission and improves the timing accuracy.

Description

Technical Field

[0001] The invention relates to the field of swimming timing system design, and in particular to a swimming timing system based on Beidou time calibration. Background Art

[0002] With the development of technology, swimming timing systems have gradually become automated and information-based. In order to meet the precise timing and accurate competition data of swimming competitions, this requires the swimming timing system to have the characteristics of high-precision timing, high response speed and high stability, ensuring that the swimming timing system can operate stably under various conditions, provide accurate competition timing, and meet the standards of swimming competitions.

[0003] Chinese patent publication number: CN108765624A, discloses a swimming timing system with the same clock source, including a communication controller, a lane controller and a communication bus, characterized in that the communication controller includes a constant temperature crystal oscillator and a CAN transceiver I, the lane controller includes a timing chip clock source and a CAN transceiver II, the CAN transceiver I is electrically connected to the constant temperature crystal oscillator, the CAN transceiver II is electrically connected to the timing chip clock source, and the CAN transceiver I is connected to the CAN transceiver II through the communication bus.

[0004] However, the prior art still has the following problems: in the process of receiving Beidou time signals, it may be affected by environmental noise. At the same time, the loss or interruption of data during the reception process will lead to a decrease in the quality of the received time signal, thereby affecting the subsequent calibration of the timer and reducing the precision and accuracy of the timing. Summary of the invention

[0005] To this end, the present invention provides a swimming timing system based on Beidou time calibration, so as to overcome the problem in the prior art that, in the process of receiving Beidou time signal, it may be affected by environmental noise. At the same time, the lack or break of data in the receiving process will lead to the reduction of the quality of the received time signal, thereby affecting the subsequent calibration of the timer and reducing the precision and accuracy of the timing.

[0006] To achieve the above object, the present invention provides a swimming timing system based on Beidou time calibration, which comprises:

[0007] A Beidou calibration module, comprising a signal receiving unit for receiving a time signal sent by a Beidou satellite and a signal calibration unit for calibrating a timer according to the time signal;

[0008] A visual monitoring module, comprising an image acquisition unit arranged at one side of the swimming pool for acquiring an image of a starting area and an image of an end area, and a signal monitoring unit for monitoring a signal characteristic corresponding to the time signal;

[0009] A time domain analysis module, which is connected to the visual monitoring module and the Beidou calibration module respectively, and is used to extract human body contour features based on the image collected by the image acquisition unit, and identify whether the human body contour features meet the feature calibration standard based on the distance relationship between the human body contour features and the midpoint of the starting area or the midpoint of the end area;

[0010] A calibration correction module, which is connected to the time domain analysis module and is used to control the Beidou calibration module to calibrate the timer based on the determination result of the time domain analysis module, including:

[0011] Constructing a signal strength time domain image, determining the trend of signal strength fluctuations, and calculating signal quality characterization parameters in combination with the signal characteristics to determine whether it is necessary to adjust the signal amplifier strength and signal receiving frequency of the signal receiving unit, and simultaneously increase the calibration frequency of the signal calibration unit. The signal characteristics include data integrity rate, carrier signal power, and noise power spectrum density;

[0012] Or, maintain the baseline operating parameters of the Beidou calibration module.

[0013] Furthermore, the time domain analysis module identifies whether the characteristic calibration standard is met, including:

[0014] If the distance between the human body contour feature and the midpoint of the starting area or the midpoint of the end area is less than or equal to the preset distance standard threshold, the feature calibration standard is met.

[0015] Furthermore, the calibration correction module calibrates the timer, including:

[0016] If the characteristic calibration standard is met, a signal strength time domain image is constructed to determine the signal strength fluctuation trend, and a signal quality characterization parameter is calculated in combination with the signal characteristics to determine whether the signal amplifier and the signal receiving frequency of the signal receiving unit need to be adjusted, and the calibration frequency of the signal calibration unit is simultaneously increased;

[0017] If the characteristic calibration standard is not met, the baseline operating parameters of the Beidou calibration module are maintained.

[0018] Furthermore, the calibration correction module constructs the signal strength time domain image including:

[0019] Acquiring signal strength data collected by the signal receiving unit;

[0020] A rectangular coordinate system is constructed with time as the horizontal axis and signal strength as the vertical axis;

[0021] Marking the coordinate points of the signal strength at each moment in the rectangular coordinate system;

[0022] The coordinate points are connected with a smooth curve to obtain the signal strength time domain image.

[0023] Furthermore, the calibration correction module calculates the signal quality characterization parameter according to formula (1):

[0024]

[0025] In formula (1), Z represents the signal quality characterization parameter, C represents the carrier signal power, and N 0 represents the noise power spectral density, and D represents the data integrity rate.

[0026] Furthermore, the calibration correction module determines whether the signal amplifier and the signal receiving frequency of the signal receiving unit need to be adjusted, including:

[0027] If the signal quality characterization parameter is less than the preset signal quality standard parameter standard threshold, the signal amplifier strength and the signal receiving frequency of the signal receiving unit need to be adjusted.

[0028] Furthermore, the signal receiving unit adjusts the signal amplifier strength, including:

[0029] Increasing the signal amplifier strength, the increase in signal reception strength is negatively correlated with the signal quality characterization parameter.

[0030] Furthermore, the signal receiving unit adjusts the signal receiving frequency.

[0031] The signal receiving frequency is increased, and the increase value of the signal receiving frequency is negatively correlated with the signal quality characterization parameter.

[0032] Furthermore, the signal calibration unit increases the calibration frequency.

[0033] The calibration frequency increase value is negatively correlated with the distance difference between the human body contour feature and the midpoint of the starting area or the midpoint of the end area.

[0034] Furthermore, it also includes an image display module, which is connected to the signal monitoring unit to display the data monitored by the signal monitoring unit.

[0035] Compared with the prior art, the present invention sets a Beidou calibration module, a visual monitoring module, a time domain analysis module and a calibration correction module. The Beidou calibration module receives the time signal and calibrates the timer. The visual monitoring module collects the images of the starting point and the end point area and monitors the signal characteristics at the same time. The time domain analysis module identifies whether the feature calibration standard is met according to the relative position relationship between the human body contour feature and the starting point or the end point area. The calibration correction module adaptively controls the Beidou calibration module to calibrate the timer based on the judgment result. Through the above process, the present invention ensures the stability and accuracy of Beidou time signal transmission and improves the accuracy of timing.

[0036] In particular, the present invention constructs a time domain analysis module to identify whether it meets the feature calibration standard based on the distance relationship between the human body contour feature and the midpoint of the starting area or the midpoint of the end area. When the distance between the human body contour feature and the midpoint of the starting area or the midpoint of the end area is close, it indicates that the swimming competition is about to start or end. At this time, the accuracy of the time is required to be higher, and it is more necessary to increase the calibration frequency to ensure the quality and accuracy of the Beidou time signal, and then to ensure the accuracy of the timing. Therefore, the present application adjusts the calibration frequency tendency through the feature calibration standard characterization, and provides data support for the subsequent adaptive calibration of the timer, thereby ensuring the stability and accuracy of the Beidou time signal transmission and improving the accuracy of the timing.

[0037] In particular, the present invention constructs a Beidou calibration module, determines the trend of signal strength fluctuations, and calculates signal quality characterization parameters in combination with signal characteristics. In actual situations, the Beidou time signal transmission process will be affected by many factors, such as environmental noise, signal strength, and broadband interference, which will lead to a decrease in the quality of the received Beidou time signal, thereby affecting the precision and accuracy of subsequent calibration. Therefore, the present application constructs a Beidou calibration module, determines the trend of signal strength fluctuations and calculates signal quality characterization parameters at the same time, and considers incorporating data integrity rate, carrier signal power, and noise power spectral density into the calculation. The above parameters can more explicitly characterize the quality of the received Beidou time signal, and then provide data support for the subsequent determination of whether it is necessary to adjust the signal amplifier strength and signal receiving frequency of the signal receiving unit through the signal quality characterization parameters, thereby ensuring the stability and accuracy of Beidou time signal transmission and improving the accuracy of timing. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the structure of a swimming timing system based on Beidou time calibration according to an embodiment of the invention;

[0039] Figure 2 A logic decision diagram for identifying whether a characteristic calibration standard is met for an embodiment of the invention;

[0040] Figure 3 A logic decision diagram for calibrating a timer of a calibration correction module according to an embodiment of the invention;

[0041] Figure 4 A logic decision diagram for adjusting the signal amplifier strength and the signal receiving frequency according to an embodiment of the invention. DETAILED DESCRIPTION

[0042] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0043] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0044] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] See also Figures 1 to 4 As shown, Figure 1 is a schematic diagram of the structure of a swimming timing system based on Beidou time synchronization according to an embodiment of the present invention, Figure 2 A logical decision diagram for identifying whether a characteristic calibration standard is met for an embodiment of the invention, Figure 3 This is a logic decision diagram of the calibration timer of the calibration correction module of the embodiment of the invention. Figure 4 The logical decision diagram for adjusting the signal amplifier strength and the signal receiving frequency in the embodiment of the invention is as follows: The swimming timing system based on Beidou time calibration in the embodiment of the invention includes:

[0046] A Beidou calibration module, comprising a signal receiving unit for receiving a time signal sent by a Beidou satellite and a signal calibration unit for calibrating a timer according to the time signal;

[0047] A visual monitoring module, comprising an image acquisition unit arranged at one side of the swimming pool for acquiring an image of a starting area and an image of an end area, and a signal monitoring unit for monitoring a signal characteristic corresponding to the time signal;

[0048] A time domain analysis module, which is connected to the visual monitoring module and the Beidou calibration module respectively, and is used to extract human body contour features based on the image collected by the image acquisition unit, and identify whether the human body contour features meet the feature calibration standard based on the distance relationship between the human body contour features and the midpoint of the starting area or the midpoint of the end area;

[0049] A calibration correction module, which is connected to the time domain analysis module and is used to control the Beidou calibration module to calibrate the timer based on the determination result of the time domain analysis module, including:

[0050] Constructing a signal strength time domain image, determining the trend of signal strength fluctuations, and calculating signal quality characterization parameters in combination with the signal characteristics to determine whether it is necessary to adjust the signal amplifier strength and signal receiving frequency of the signal receiving unit, and simultaneously increase the calibration frequency of the signal calibration unit. The signal characteristics include data integrity rate, carrier signal power, and noise power spectrum density;

[0051] Or, maintain the baseline operating parameters of the Beidou calibration module.

[0052] Specifically, the specific structure of the signal receiving unit is not limited. It is only necessary to provide an instrument for receiving the time signal sent by the Beidou satellite, for example, a Beidou signal receiver. This is a prior art and will not be described in detail.

[0053] Specifically, the specific structure of the signal calibration unit is not limited. It only needs to provide a signal that can identify the time signal and complete the calibration of the timer. This is a prior art and will not be described in detail.

[0054] Specifically, the specific structure of the image acquisition unit is not limited. Preferably, an industrial CCD camera can be used to obtain images with higher precision, which will not be described in detail.

[0055] Specifically, the starting point area is the area of ​​the starting platform, and the end point area is the distance range close to the moment of touching the wall, which can be calibrated in advance and will not be described in detail.

[0056] Specifically, there is no limitation on the calibration correction module or each unit therein, and it can be composed of a logic component or a combination of logic components, and the logic component includes a field programmable processor, a computer or a microprocessor in a computer.

[0057] Specifically, the time domain analysis module identifies whether the feature calibration standard is met, including:

[0058] If the distance between the human body contour feature and the midpoint of the starting area or the midpoint of the end area is less than or equal to the preset distance standard threshold, the feature calibration standard is met.

[0059] In this embodiment, the distance standard threshold L0 is selected within the interval [0 cm, 1 m].

[0060] Specifically, the present invention constructs a time domain analysis module to identify whether the distance relationship between the human body contour feature and the midpoint of the starting area or the midpoint of the end area meets the feature calibration standard. When the distance between the human body contour feature and the midpoint of the starting area or the midpoint of the end area is close, it indicates that the swimming competition is about to start or end. At this time, the accuracy of the time is required to be higher, and it is more necessary to increase the calibration frequency to ensure the quality and accuracy of the Beidou time signal, and then to ensure the accuracy of the timing. Therefore, the present application adjusts the calibration frequency tendency through the feature calibration standard characterization, and provides data support for the subsequent adaptive calibration of the timer, thereby ensuring the stability and accuracy of the Beidou time signal transmission and improving the accuracy of the timing.

[0061] Specifically, the calibration correction module calibrates the timer, including:

[0062] If the characteristic calibration standard is met, a signal strength time domain image is constructed to determine the signal strength fluctuation trend, and a signal quality characterization parameter is calculated in combination with the signal characteristics to determine whether the signal amplifier and the signal receiving frequency of the signal receiving unit need to be adjusted, and the calibration frequency of the signal calibration unit is simultaneously increased;

[0063] If the characteristic calibration standard is not met, the baseline operating parameters of the Beidou calibration module are maintained.

[0064] Specifically, the calibration correction module constructs the signal strength time domain image including:

[0065] Acquiring signal strength data collected by the signal receiving unit;

[0066] A rectangular coordinate system is constructed with time as the horizontal axis and signal strength as the vertical axis;

[0067] Marking the coordinate points of the signal strength at each moment in the rectangular coordinate system;

[0068] The coordinate points are connected with a smooth curve to obtain the signal strength time domain image.

[0069] Specifically, the calibration correction module calculates the signal quality characterization parameter according to formula (1):

[0070]

[0071] In formula (1), Z represents the signal quality characterization parameter, C represents the carrier signal power, and N 0 represents the noise power spectral density, and D represents the data integrity rate.

[0072] Specifically, in the embodiment, the carrier signal power C, the noise power spectrum density N 0And the data integrity rate D is monitored by a high-precision Beidou signal receiver, which can provide detailed information on the Beidou signal quality.

[0073] Specifically, the present invention constructs a Beidou calibration module, determines the trend of signal strength fluctuations, and calculates signal quality characterization parameters in combination with signal characteristics. In actual situations, the Beidou time signal transmission process will be affected by many factors, such as environmental noise, signal strength, and broadband interference, which will lead to a decrease in the quality of the received Beidou time signal, thereby affecting the precision and accuracy of subsequent calibration. Therefore, the present application constructs a Beidou calibration module, determines the trend of signal strength fluctuations and calculates signal quality characterization parameters at the same time, and considers including data integrity rate, carrier signal power, and noise power spectral density into the calculation. The above parameters can more explicitly characterize the quality of the received Beidou time signal, and then provide data support for the subsequent determination of whether it is necessary to adjust the signal amplifier strength and signal receiving frequency of the signal receiving unit through the signal quality characterization parameters, thereby ensuring the stability and accuracy of Beidou time signal transmission and improving the accuracy of timing.

[0074] Specifically, the calibration correction module determines whether the signal amplifier and the signal receiving frequency of the signal receiving unit need to be adjusted, including:

[0075] If the signal quality characterization parameter is less than the preset signal quality standard parameter standard threshold, the signal amplifier strength and the signal receiving frequency of the signal receiving unit need to be adjusted.

[0076] Specifically, the signal receiving unit adjusts the signal amplifier strength, including:

[0077] Increasing the signal amplifier strength, the increase in signal reception strength is negatively correlated with the signal quality characterization parameter.

[0078] In this embodiment, optionally,

[0079] The signal quality characterization parameter Z is compared with the first signal quality characterization parameter comparison threshold Z1 and the second signal quality characterization parameter comparison threshold Z2,

[0080] If Z>Z2, the signal receiving strength increase value is determined to be the first signal receiving strength increase value f1, and f1=0.2f0;

[0081] If Z1≤Z≤Z2, the signal receiving strength increase value is determined to be the second signal receiving strength increase value f2, and f2=0.3f0 is set;

[0082] If Z<Z1, the signal receiving strength increase value is determined to be the third signal receiving strength increase value f3, and f3=0.5f0 is set;

[0083] Wherein, f0 represents the initial signal receiving strength, Z1=1.1Z0, Z2=1.2Z0.

[0084] Z0 represents the standard threshold of the signal quality characterization parameter. To characterize the signal quality, Z0 is selected in the interval [33,38].

[0085] Specifically, the signal receiving unit adjusts the signal receiving frequency.

[0086] The signal receiving frequency is increased, and the increase value of the signal receiving frequency is negatively correlated with the signal quality characterization parameter.

[0087] In this embodiment, optionally,

[0088] The signal quality characterization parameter Z is compared with the first signal quality characterization parameter comparison threshold Z1 and the second signal quality characterization parameter comparison threshold Z2,

[0089] If Z>Z2, the signal receiving frequency increase value is determined to be the first signal receiving frequency increase value p1, and p1=0.2p0;

[0090] If Z1≤Z≤Z2, the signal receiving frequency increase value is determined to be the second signal receiving frequency increase value p2, and p2=0.4p0 is set;

[0091] If Z<Z1, the signal receiving frequency increase value is determined to be the third signal receiving frequency increase value p3, and p3=0.6p0;

[0092] Wherein, p0 represents the initial signal receiving frequency, Z1=1.1Z0, Z2=1.2Z0.

[0093] Specifically, the signal calibration unit increases the calibration frequency.

[0094] The calibration frequency increase value is negatively correlated with the distance difference between the human body contour feature and the midpoint of the starting area or the midpoint of the end area.

[0095] In this embodiment, optionally,

[0096] The distance difference L between the human body contour feature and the midpoint in the starting area or the midpoint in the end area is compared with the distance difference comparison threshold L1 between the first human body contour feature and the midpoint in the starting area or the midpoint in the end area and the distance difference comparison threshold L2 between the second human body contour feature and the midpoint in the starting area or the midpoint in the end area.

[0097] If L>L2, the calibration frequency increase value is determined to be the first calibration frequency increase value m1, and m1=0.3p0;

[0098] If L1≤L≤L2, the calibration frequency increase value is determined to be the second calibration frequency increase value m2, and m2=0.5m0 is set;

[0099] If L<L1, the calibration frequency increase value is determined to be the third calibration frequency increase value m3, and m3=0.7m0;

[0100] Wherein, m0 represents the initial calibration frequency, L1=1.1L0, L2=1.15L0, and m0 is selected within the range of [1200MHz, 1500MHz].

[0101] Specifically, it also includes an image display module, which is connected to the signal monitoring unit to display the data monitored by the signal monitoring unit.

[0102] Specifically, there is no limitation on the specific device of the display module. It only needs to provide an instrument for displaying the trend of signal strength fluctuation, such as an electronic display screen, which will not be described in detail.

[0103] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A swimming timing system based on Beidou time calibration, characterized in that: include: A Beidou calibration module, comprising a signal receiving unit for receiving a time signal sent by a Beidou satellite and a signal calibration unit for calibrating a timer according to the time signal; A visual monitoring module, comprising an image acquisition unit arranged at one side of the swimming pool for acquiring an image of a starting area and an image of an end area, and a signal monitoring unit for monitoring a signal characteristic corresponding to the time signal; A time domain analysis module, which is connected to the visual monitoring module and the Beidou calibration module respectively, and is used to extract human body contour features based on the image collected by the image acquisition unit, and identify whether the human body contour features meet the feature calibration standard based on the distance relationship between the human body contour features and the midpoint of the starting area or the midpoint of the end area; a calibration correction module, which is connected to the time domain analysis module and is used to control the Beidou calibration module to calibrate the timer based on the determination result of the time domain analysis module, include, Constructing a signal strength time domain image, determining the trend of signal strength fluctuations, and calculating signal quality characterization parameters in combination with the signal characteristics to determine whether it is necessary to adjust the signal amplifier strength and signal receiving frequency of the signal receiving unit, and simultaneously increase the calibration frequency of the signal calibration unit. The signal characteristics include data integrity rate, carrier signal power, and noise power spectrum density; or, maintain the baseline operating parameters of the BeiDou calibration module; The calibration correction module calculates the signal quality characterization parameter according to formula (1), In formula (1), Z represents the signal quality characterization parameter, C represents the carrier signal power, N0 represents the noise power spectrum density, and D represents the data integrity rate.

2. The swimming timing system based on Beidou time calibration according to claim 1, characterized in that: The time domain analysis module identifies whether the characteristic calibration standard is met, including: If the distance between the human body contour feature and the midpoint of the starting area or the midpoint of the end area is less than or equal to the preset distance standard threshold, the feature calibration standard is met.

3. The swimming timing system based on Beidou time calibration according to claim 1, characterized in that: The calibration correction module calibrates the timer. include, If the characteristic calibration standard is met, a signal strength time domain image is constructed to determine the signal strength fluctuation trend, and a signal quality characterization parameter is calculated in combination with the signal characteristics to determine whether the signal amplifier and the signal receiving frequency of the signal receiving unit need to be adjusted, and the calibration frequency of the signal calibration unit is simultaneously increased; If the characteristic calibration standard is not met, the baseline operating parameters of the Beidou calibration module are maintained.

4. The swimming timing system based on Beidou time calibration according to claim 1, characterized in that: The calibration correction module constructs the signal strength time domain image including: Acquiring signal strength data collected by the signal receiving unit; A rectangular coordinate system is constructed with time as the horizontal axis and signal strength as the vertical axis; Marking the coordinate points of the signal strength at each moment in the rectangular coordinate system; The coordinate points are connected with a smooth curve to obtain the signal strength time domain image.

5. The swimming timing system based on Beidou time calibration according to claim 1, characterized in that: The calibration correction module determines whether the signal amplifier and the signal receiving frequency of the signal receiving unit need to be adjusted, including: If the signal quality characterization parameter is less than the preset signal quality standard parameter standard threshold, the signal amplifier strength and the signal receiving frequency of the signal receiving unit need to be adjusted.

6. The swimming timing system based on Beidou timekeeping according to claim 1, characterized in that: The signal receiving unit adjusts the signal amplifier strength, including: Increasing the signal amplifier strength, the increase in signal reception strength is negatively correlated with the signal quality characterization parameter.

7. The swimming timing system based on Beidou time calibration according to claim 1, characterized in that: The signal receiving unit adjusts the signal receiving frequency, The signal receiving frequency is increased, and the increase value of the signal receiving frequency is negatively correlated with the signal quality characterization parameter.

8. The swimming timing system based on Beidou time calibration according to claim 1, characterized in that: The signal calibration unit increases the calibration frequency, The calibration frequency increase value is negatively correlated with the distance difference between the human body contour feature and the midpoint of the starting area or the midpoint of the end area.

9. The swimming timing system based on Beidou timekeeping according to claim 1, characterized in that: It also includes an image display module, which is connected to the signal monitoring unit to display the data monitored by the signal monitoring unit.

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