EP3613480B1 - Method and system for continuous ranking of a competitor along a route of a slalom type gliding sport discipline - Google Patents

Description

Field of the invention

The invention relates to a method for continuously ranking a competitor during a course in a slalom-type sliding sport discipline, the competitor being provided with at least one gliding board, such as skis or a snowboard. .

The invention also relates to a continuous ranking system of a competitor for implementing the method.

A method and a system of continuous classification of a competitor during a course are known for example from the document CH 707 401 .

Background of the invention

In a sliding sport competition, such as a slalom or giant slalom type ski race, which may have one or two rounds, the race is made more attractive to a spectator or viewer by displaying the competitor's split times. on the track, in order to be able to classify it what its current position is in relation to previous competitors. Intermediate times are for example measured using a light barrier between two photoelectric cells, which are placed a few meters apart from each other, and which trigger the instantaneous recording of the stopwatch value when the competitor crosses the fence. However, the configuration of the terrain and the risk of inadvertent triggering by members of the organization restrict its use on the runway.

Another method consists in manually triggering the recording of the value of the stopwatch when the competitor passes, but the precision and reliability are not great enough.

To determine the exact moment of the passage of a competitor, there is a method and a system described in the document WO2016174612 , in which magnets are placed along the path, preferably on each door. The magnets are detected by a magnetometer worn by the competitor, and the data is transmitted to know the competitor's passage time at each gate passage. However, the implementation is long, because it is necessary to place each magnet in the snow, which is all the more inconvenient when the course is modified between two runs. In addition, the range of the magnets is not always sufficient when a competitor passes a greater distance from the door.

In another document ( WO2010119084 ), accelerometers are fitted in the gates or slalom poles, to detect the passage of the competitor. However, such a device does not make it possible to identify the door in order to differentiate them from one another, and in addition does not facilitate the replacement of a door during a race.

It should also be noted that it is possible to envisage performing the speed measurement continuously using a receiver of a satellite positioning system of the GPS / GNSS type (for “Global Positioning System / Global Navigation Satellite System” in English). Depending on the disturbances due to multipath signals, a sky obstructed by mountains or other objects and the geometric dilution of the accuracy, an accuracy of 95% can still be achieved. On an assembly slope with 45 ° incline, the horizontal speed is 30% lower than the speed in three dimensions. To work accurately on a racing skier, the GPS receiver must be placed on a skier's helmet, but this represents an unacceptable safety risk during a race. In addition, as the sensor is not integral with the ski, there is a lack of precision due to the movements between the head and the ski. Even though the technology GPS allows speed measurement normally in three directions, the user of the GPS device only receives two-dimensional speed horizontally. This can cause the skier to differ greatly from their actual speed, which is a disadvantage.

Summary of the invention

The aim of the invention is therefore to overcome the drawbacks of the aforementioned state of the art by proposing a method for continuously ranking a competitor during a course in a slalom-type sliding sport discipline, the competitor being equipped with at least one board for gliding, such as skis or a snowboard, in which it is possible to rank the competitor in relation to previous competitors, which is regularly renewed throughout the course

To this end, the invention relates to a method for continuously ranking a competitor during a course in a sliding sports discipline of the slalom type, the competitor being provided with at least one gliding board, such as skis or a snowboard.

• une étape de mesure de la variation angulaire latérale de la planche de glisse autour d'un axe prédéfini,
• une étape de détection d'un instant où l'angle passe par une valeur prédéfinie,
• une étape d'enregistrement du temps de parcours du concurrent correspondant à l'instant détecté,
• une étape de comparaison du temps de parcours enregistré avec ceux des concurrents précédents pour l'instant détecté correspondant, et
• une étape de classement du concurrent par rapport aux concurrents précédents en fonction du temps de parcours de chacun.

The process is remarkable in that it iteratively includes:

• a step of measuring the lateral angular variation of the gliding board around a predefined axis,
• a step of detecting an instant when the angle passes through a predefined value,
• a step of recording the time spent by the competitor corresponding to the moment detected,
• a step of comparing the recorded journey time with those of previous competitors for the corresponding detected instant, and
• a stage of classification of the competitor compared to the preceding competitors according to the travel time of each one.

Thus, only one parameter is monitored, the lateral orientation of the gliding board, for example a ski or a snowboard, to determine the moments when the competitor makes a change of position between two turns of the slalom. Lateral orientation changes usually occur between obstacles that need to be circumvented on a slalom, for example gates or stakes.

Whatever the trajectory of the competitor, the changes in orientation generally occur at the same level of the ski slope between the gates. Consequently, by detecting at what instants they occur, we can follow the progress of the competitor throughout the slalom and determine the run times of the competitors between each change of orientation. Travel times are thus progressively recorded throughout the slalom, each recorded time corresponding to a change in orientation of the skis.

The recorded run time is compared to the recorded run time of previous competitors for a corresponding detected instant. Thus, the competitor performing the slalom can be classified in relation to the previous competitors for this moment. We know the place the competitor occupies at this point in the race.

At each new moment detected, the competitor's ranking is re-evaluated using this process. The competitor's classification is thus renewed very frequently, almost between each obstacle in the slalom.

Thanks to this process, it suffices to monitor a single parameter, the lateral rotation angle of the ski board with respect to the plane of the slalom run, to determine the journey time to be recorded and to compare it with previous competitors. In this way, we have a reliable and technically simple process which makes it possible to renew frequently ranking the competitor and monitoring changes in the competitor's position in the ranking throughout the course.

In addition, the method does not require complex installation on the track of the course or on the obstacles of the slalom. In addition, we do not have recourse to an external factor, on which we would depend, such as a satellite system for example.

According to a particular embodiment of the invention, in the measurement step, the predefined axis is chosen to be oriented substantially along the longitudinal axis of the gliding board, the lateral angle being measured relative to the plane of the track. of the sliding course.

According to a particular embodiment of the invention, in the detection step, the value of the predefined angle is chosen to be zero, the gliding board being substantially parallel to the plane of the track.

According to a particular embodiment of the invention, in the detection step, the sign of the value of the angle is detected.

According to a particular embodiment of the invention, in the detection step, instants are detected for two angle values, a first type of instants when the value of the angle goes from a value less than one. value greater than or equal to a first predefined value, and a second type of time when the angle passes from a value greater than a value less than or equal to a second predefined value.

According to a particular embodiment of the invention, at the recording step, the first types of times are associated with a bend in a first direction, substantially orthogonal to the predefined axis, and the second types of times are associated with a turn in the direction opposite to the first turn, for example to the right and to the left.

According to a particular embodiment of the invention, the first predefined value is within an interval ranging from 3 ° to 30 °, preferably from 5 ° to 15 °, for example 10 °, and the second predefined value is within a range of -30 ° to -3 °, preferably -15 ° to -5 °, for example -10 °.

According to a particular embodiment of the invention, in the comparison step, an average travel time is calculated over a series of consecutive detected instants, for example over the last four detected instants.

According to a particular embodiment of the invention, at the classification step, the competitor is classified with respect to the preceding competitors as a function of the average journey time.

According to a particular embodiment of the invention, the classification step is carried out on the basis of a predefined number of times detected, for example from the fourth moment detected.

According to a particular embodiment of the invention, the method comprises an additional step of transmitting the recorded time, between the detection step and the recording step.

According to a particular embodiment of the invention, the method comprises an additional step of displaying the ranking of the competitor for the moment detected.

According to a particular embodiment of the invention, in the display step, the journey time of the competitor for the moment detected is also displayed.

The invention also relates to a system for continuously ranking a competitor during a course in a sliding sports discipline of the slalom type, the competitor being provided with at least one gliding board, such as skis or a snowboard. snow, for the implementation of the continuous classification method described above.

• une unité de mesure pour mesurer la variation angulaire latérale de la planche de glisse autour d'un axe prédéfini, par exemple une unité de mesure inertielle munie d'un gyroscope.
• une unité de détection configurée pour détecter l'instant où l'angle passe par une valeur prédéfinie,
• un dispositif de chronométrage du temps de parcours des concurrents,
• une unité de traitement configurée pour enregistrer le temps de parcours du concurrent lorsqu'elle reçoit un signal de détection, le comparer avec ceux des concurrents précédents pour l'instant détecté correspondant, et effectuer un classement du concurrent par rapport aux concurrents précédents en fonction du temps de parcours de chacun.

To this end, the system includes:

• a measurement unit for measuring the lateral angular variation of the gliding board around a predefined axis, for example an inertial measurement unit provided with a gyroscope.
• a detection unit configured to detect the instant when the angle passes through a predefined value,
• a device for timing the time spent by competitors,
• a processing unit configured to record the competitor's journey time when it receives a detection signal, compare it with those of previous competitors for the corresponding detected instant, and perform a ranking of the competitor compared to previous competitors according to the travel time of each.

According to a particular embodiment of the invention, the system comprises a portable transponder module provided with the measurement unit, the detection unit and a transmitter for transmitting the detection signal to the processing unit. .

According to a particular embodiment of the invention, the transponder module is arranged on a ski boot of the competitor.

According to a particular embodiment of the invention, the system comprises a classification display unit.

Brief description of the drawings

• La figure 1 est une représentation schématique d'un parcours de glisse de type slalom pour lequel un procédé selon l'invention est utilisé.
• La figure 2 est un schéma synoptique d'un procédé de classement d'un concurrent selon l'invention.
• La figure 3 est un graphique représentant les variations angulaires latérale de la planche de glisse lors d'un parcours de glisse de type slalom.
• La figure 4 est un graphique représentant le comptage du nombre de virages à gauche et à droite effectué avec le procédé.
• La figure 5 est un tableau montrant un exemple de classement obtenu avec le procédé selon l'invention.
• La figure 6 est une représentation schématique d'un système de classement selon l'invention.

The aims, advantages and characteristics of the method and classification system according to the invention will appear better in the following description of at least one non-limiting embodiment illustrated by the drawings in which:

• The figure 1 is a schematic representation of a slalom-type sliding course for which a method according to the invention is used.
• The figure 2 is a block diagram of a method for classifying a competitor according to the invention.
• The figure 3 is a graph representing the lateral angular variations of the gliding board during a slalom type gliding course.
• The figure 4 is a graph showing the count of the number of left and right turns made with the method.
• The figure 5 is a table showing an example of classification obtained with the method according to the invention.
• The figure 6 is a schematic representation of a classification system according to the invention.

Detailed description of the invention

According to the invention, the method is designed to allow the continuous classification of a competitor in relation to previous competitors during a course in a slalom-type sliding sport discipline. This is for example a slalom or giant slalom track to be performed with skis or snowboard. The invention can also be extended to any sliding sport in which it is necessary to make frequent turns.

The term “continuous” is understood to mean the fact that the classification is regularly updated, and that it is frequently reproduced during the competitor's course. The competitor is equipped with at least one board for gliding, such as skis or a snowboard, which allow him to glide on the track, which is covered with snow.

During a course 13 of slalom, such as the one shown on the figure 1 , the competitor must circumvent obstacles by making turns around them by a side defined in advance. The competitor's route 13 is shown in dashes on the figure 1 . Obstacles are, for example, stakes or slalom gates 2 stuck in the snow. Generally, the successive turns are oriented in opposite directions. For example, by going in the direction of the slope of the track, the competitor makes a left turn 3 to turn around a first gate 2 that he must bypass on the right of the track, then a right turn 4 to turn around a second door 2 that he must bypass on the left. Thus, between two gates, the competitor must suddenly change position to make a turn in the other direction. To do this, he modifies the lateral orientation of the skis on the track to turn in the other direction. These changes are represented by small circles on the figure 1 .

By detecting the instant when the competitor has modified the lateral position of the skis, we determine the points of passage 5 of the course 13 for which we measure the journey times 13, which make it possible to make a renewed classification of the competitor compared to the previous competitors. , at each waypoint 5 of the route 13.

To this end, method 1, shown in figure 2 , consists in a first step 6, in measuring the lateral angular variation of the gliding board around a predefined axis. Preferably, a predefined axis is chosen which is oriented substantially along the longitudinal axis of the gliding board. When the board is flat on the track the angle is zero, and when the board is lifted on one side or the other, it makes a positive angle on one side and negative on the other with the track position . Thus, the angle that the gliding board makes with the track is measured along the predefined axis.

In a second step 7, an instant is detected when the angle passes through a predefined value.

According to a first embodiment of method 1, a value of the zero angle is chosen so that the gliding board is substantially parallel to the plane of the track when this instant is detected. Thus, when the competitor changes his skis for lateral orientation between two turns, he necessarily passes through a zero lateral angle value.

According to a second embodiment of method 1, the sign of the value of the angle is additionally detected to find out whether the angle has passed through a zero value. In addition, we can deduce from the sign, what type of turn it is. For example, when the angle becomes negative, a left turn is detected, and when the angle becomes positive, a right turn is detected. We can therefore associate with each detection, the orientation of the turn, whether it is to the left or to the right. By associating a type of turn with each detection, it is possible to follow whether the competitor is indeed following the same course as the other competitors.

According to a third embodiment of method 1, instants are detected for two values of angles, a first type of instants when the value of the angle goes from a value lower to a value greater than or equal to a first value predefined, and a second type of instants when the angle goes from a value greater than a value less than or equal to a second predefined value.

The first types of times are associated with a turn in a first direction, substantially orthogonal to the predefined axis, and the second types of times are associated with a turn in the direction opposite to the first turn. For example, a right turn is detected when the angle has a value greater than or equal to the first predefined value and a left turn when the angle has a value less than or equal to a second predefined value.

The first preset value is within a range of 3 ° to 30 °, preferably 5 ° to 15 °, and the second preset value is within a range of -30 ° to -3 °, preferably - 15 ° to -5 °, to count all turns. For example, an angle of 10 ° is chosen for the first value, and -10 ° for the second value. In this example, we detect a left turn when the angle reaches -10 °, while it was greater than this value, and a right turn when the angle reaches 10 °, while the angle was less than this value.

In this third embodiment, there is a hysteresis effect of the detection, so as to avoid detecting small turns, which the competitor makes for example to get back, and which is not due to the avoidance of 'a door. In the last example, no bend is detected for values less than 10 ° and greater than -10 °.

In the example of figure 2 , the method 1 comprises a third additional step 8 of transmission of the instant when the angle passes through a predefined value, between the detection step and the recording step. This step is optional and exists for example to make the connection between a mobile detector, such as a transponder, and a processing unit which carries out the remainder of method 1. For a mobile system which would carry out all of method 1, the transmission step does not exist.

Method 1 comprises a fourth step 9 of recording the journey time of the competitor corresponding to the moment detected. The competitor's course is timed from the start by usual timing means. Thus, as soon as an instant is detected, the current travel time is instantly recorded in order to associate it with the detected instant.

In the first embodiment, a travel time is associated with each passage of the angle by the zero value.

In the second embodiment, a travel time is associated with each change in sign of the value of the angle. In addition, we know the direction of the turn, left or right. We can therefore verify that the competitors have made the same number of turns to the left and to the right.

In the third embodiment, a travel time is associated as soon as the angle is greater than or equal to the first predefined value, or else as soon as the angle is less than or equal to the second predefined value. In addition, it is known which is the direction of the turn, to the left or to the right, as in the second embodiment.

The next step is a step of comparing the recorded journey time with those of previous competitors for the corresponding detected instant. Advantageously, the recorded journey times of the competitor are counted and the last recorded journey time is compared with the recorded journey times of previous competitors of the same order.

According to a particular embodiment, during the comparison step, an average travel time is calculated over a series of consecutive detected instants. To increase the reliability of the classification, the average value is for example calculated over the last four instants detected. Thus, an incorrect classification is avoided due to an anomaly in the competitor's course.

Thanks to the recorded travel time, we then proceed to a classification step 11 of the competitor compared to the previous competitors according to the travel time of each. In the embodiment where an average travel time is calculated over several instants, the competitor is classified with respect to the previous competitors as a function of the calculated average travel time.

Advantageously, the classification step is carried out on the basis of a predefined number of times detected, for example from the fourth moment detected. This avoids making a classification on the first moments detected because there are risks of errors.

On the figure 2 , the method 1 comprises an additional optional display step 12 of the ranking of the competitor for the moment detected. The classification can thus be followed by spectators or viewers watching the race. In addition, the competitor's journey time can be displayed to monitor whether the competitor has little or a lot of time ahead or behind previous competitors.

The continuous classification method 1 described above is implemented iteratively during the course of the competitor. Process 1 is repeated in the order of the steps described above to renew the classification frequently, here at each change of turn by the competitor.

On graph 14 of the figure 3 , function 15 represents the value of the lateral rotation angle of the gliding board around the predefined axis on a sliding sport course of the slalom type. The value of angle 16 is on the ordinate, while the abscissa represents time 17. As soon as the angle passes through the zero value of angle 18, the competitor has changed direction of turn. Each vertex 19 of the function corresponds to a door that the competitor has bypassed. Thus, by detecting the instants when the angle passes through the zero value, a travel time between two gates is deduced therefrom.

The figure 4 shows how the left or right turns are counted according to the sign of the angle that we see on the graph of the figure 3 . Here, the sign of the angle is detected in order to deduce therefrom the nature of the bends. Function 21 has a toothed profile, with positive 22 or negative 23 teeth depending on the sign of the angle, each tooth representing a left or right turn. The positive value slots correspond, for example, to right turns, and the negative value slots to left turns. The competitor therefore made thirty right turns and twenty-nine left turns here, ie fifty-nine turns counted in the end. The fifty-nine turns are counted above the square curve, while the left and right turns are differentiated and entered directly on each corresponding square.

An example of ranking between several competitors, three in the example, is shown in table 25 of the figure 5 , on which we have classified and detected five instants G0, G1, G2, G3 and G4 corresponding to five turns made during a course of the slalom type. Five lap times T01, T02, T03, T11, T12, T1, T21, T22, T23, T31, T32, T33, T41, T42, T43, were therefore recorded for each competitor at times G0, G1, G2, G3 and G4. For the first three times of passage G0, G1, G2, no classification is made, but a classification 26, 27 is carried out at the fourth and fifth time of passage of the instants G4 and G5. In addition, the table corresponds to the embodiment in which an average of the travel times is calculated from the fourth detected instant, here for the instants G3 and G4. The average [Tij] is calculated for an instant Gi, and for a competitor j, by the following equation: $$\left[\mathrm{Tij}\right]=\frac{\mathrm{Tij}+\mathrm{T}\left(\mathrm{i}-1\right)\mathrm{j}+\mathrm{T}\left(\mathrm{i}-2\right)\mathrm{j}+\mathrm{T}\left(\mathrm{i}-3\right)\mathrm{<figure-callout\; id="4"\; label="j"\; filenames="imgf0002.png"\; state="\{\{state\}\}">j</figure-callout>}}{4}$$

Thus, from the calculated averages [T31], [T32], [T33], [T41], [T42], [T43], we classify the competitors from the lowest average to the highest average for the times G3 and G4. For the moment G3, the third competitor is the fastest in front of the first and the second, while at the detected moment G4, the second competitor is faster than the first, the third being always the fastest.

The invention also relates to a system for continuously ranking a competitor during a course in a sliding sports discipline of the slalom type. The system 30 is, in particular, able to implement the method described above. The figure 6 schematically shows the main elements that make up the ranking system 30 in a slalom type race, such as a ski or snowboard race. The system 30 is designed to perform a ranking of the competitors in real time, that is to say live or continuously, while allowing a live display of this ranking on a screen or by a television broadcast on a television. spectators or viewers.

The system 30 comprises one or more transponder modules 31, which are each intended to be worn by a competitor, who wears it for the measurement in particular of the lateral angular variation of the gliding board. Each transponder module 31 for the competition is arranged for example at one of the competitor's shoes. The transponder module 31 comprises a transmitter 32 provided with an antenna for transmitting a data signal, in particular a signal for detecting an instant when the angle passes through the predefined value. For the transmission of a data signal, the carrier frequency of the signal can be between 300 MHz and 3,000 MHz, and in particular for example at 433 MHz, 868 MHz or 915 MHz. Data modulation is performed by amplitude modulation or frequency or phase modulation. It can be chosen from among several carrier frequencies for the transmission of the data signal. Thus different transmission channels can be selected.

Each transponder module comprises a measurement unit 33 for measuring the lateral angular variation of the gliding board around the predefined axis. The measurement unit 33 is for example an inertial measurement unit, which is a movement sensor generally composed of a triaxial accelerometer, a triaxial gyroscope and a triaxial magnetometer. The gyroscope makes it possible to measure the variation in angle around the predefined axis. It has been noted that a sensor provided only with a gyroscope is sufficient to measure the angular variation according to the method.

The transponder module 31 also comprises a detection unit 34 configured to detect the instant when the measured angle passes through the predefined value (s), as well as the sign of the angle if necessary. Therefore, as soon as the angle value is detected, the module instantly transmits a detection signal.

The system 30 also comprises one or more base stations 35, 36, 37, which can each receive a signal transmitted by the antenna of the transmitter 32 of the transponder module 31 while racing, in particular a signal. detection of an instant when the competitor passes through the predefined angle value (s). Each base station 35, 36, 37 can receive separately or together by a reception antenna 41, 42, 43, the signal of the transponder module 31. It should be noted that each base station 35, 36, 37 of the device can be placed at a specific location on the race track. For example, for a ski or snowboard race, it may be possible to place base stations 35, 36, 37 spaced from one another by 200 to 400 m between the start and the finish of the race. race. Each base station 35, 36, 37 or at least one base station can receive a data signal from the transponder module 31 carried by the competitor during his race.

The system 30 is also equipped with a timing device 38 and a display unit 39. The timing device 38 manages the timing of the race of each competitor, and thus measures the course time of the competitors from the start. until the arrival of the competitor. The display unit 39 makes it possible to display the ranking in real time or continuously on at least one screen for spectators or viewers via television broadcasting devices or on the Internet.

The system 30 further comprises a processing unit 40 connected to the various base stations 35, 36, 37, and to the timing device 38. The various base stations 35, 36, 37 can be connected by cable or also by communication. wireless so as to transmit the signal to the processing unit 40 by cable or also by wireless transmission. The processing unit 40 is configured to record the run time of the competitor when it receives a detection signal from the transmitter 32 of the transponder module 31, transmitted by the bases 35, 36, 37. The processing unit 40 records the journey time of the detected instant and compares the journey time with those of previous competitors for the corresponding detected instant. The processing unit 40 then performs a classification of the competitor in relation to the previous competitors as a function of the travel time of each, according to one of the embodiments of the method described above. The classification is transmitted simultaneously to the display unit 39 for the spectators or televiewers.

Claims (17)

1. Method (1) for the continuous ranking of competitors during a race of a slalom skiing type sports discipline, the competitor being provided with at least one gliding board, such as skis or a snowboard, the method (1) being characterized in that it includes the following iterative steps:

   - a step (6) of measuring the variation in the lateral angle of the gliding board about a predefined axis,

   - a step (7) of detecting the moment when the angle passes through a predefined value,

   - a step (9) of recording the competitor's run time corresponding to the detected moment,

   - a step (10) of comparing the stored run time with those of the preceding competitors for the corresponding detected moment, and

   - a step (11) of ranking the competitor with respect to the preceding competitors as a function of the run time of each competitor.
2. Method (1) according to claim 1, characterized in that, in the measuring step (6), the predefined axis is chosen to be oriented substantially along the longitudinal axis of the gliding board, the lateral angle being measured with respect to the plane of the piste of the slalom course.
3. Method (1) according to claim 2, characterized in that, in the detection step (7), the value of the predefined angle is chosen to be zero, the gliding board being substantially parallel to the plane of the piste.
4. Method (1) according to claim 3, characterized in that, in the detection step (7), the sign of the value of the angle is detected.
5. Method (1) according to claim 1 or 2, characterized in that, in the detection step (7), moments are detected for two angle values, a first type of moment when the angle value changes from a value less than a value greater than or equal to a first predefined value, and a second type of moment when the angle changes from a greater value to a value less than or equal to a second predefined value.
6. Method (1) according to claim 5, characterized in that, in the recording step (9), the first types of moment are associated with a turn in a first direction, substantially orthogonal to the predefined axis, and the second types of moment are associated with a turn in the opposite direction to the first turn, for example right (4) and left (3).
7. Method (1) according to claim 6, characterized in that the first predefined value is comprised in a range of 3° to 30°, preferably of 5° to 15°, for example 10°, and the second predefined value is comprised in a range of -30° to -3°, preferably of -15° to -5°, for example -10°.
8. Method (1) according to any of the preceding claims, characterized in that, in the comparison step (10), a mean run time is computed over a series of consecutive detected moments, for example over the last four detected moments.
9. Method (1) according to claim 8, characterized in that, in the ranking step (11), the competitor is ranked with respect to the preceding competitors as a function of the mean run time.
10. Method (1) according to any of the preceding claims, characterized in that, the ranking step (11) is performed after a predefined number of detected moments, for example after the fourth detected moment.
11. Method (1) according to any of the preceding claims, characterized in that the method includes an additional step (8) of transmitting the recorded time, between the detection step (7) and the recording step (9).
12. Method (1) according to any of the preceding claims, characterized in that the method includes an additional step (12) of displaying the ranking of the competitor for the detected moment.
13. Method (1) according to claim 12, characterized in that, in the display step, the competitor's run time for the detected moment is also displayed.
14. System (30) for the continuous ranking of competitors during a race (13) of a slalom skiing type sports discipline, the competitor being provided with at least one gliding board, such as skis or a snowboard, the method (30) being characterized in that it includes:

    - a measurement unit (33) for measuring the variation in the lateral angle of the gliding board about a predefined axis, for example an inertial measurement unit provided with a gyroscope.

    - a detection unit (34) configured to detect the moment when the angle passes through a predefined value,

    - a device for timing (38) the run time of the competitors,

    - a processing unit (40) configured to record the competitor's run time when it receives a detection signal, to compare said run time with those of the preceding competitors for the corresponding detected moment, and to rank the competitor with respect to the preceding competitors as a function of the run time of each competitor.
15. System (30) according to claim 14, characterized in that the system includes a portable transponder module (31) provided with the measurement unit (33), the detection unit (34) and a transmitter (32) for transmitting the detection signal to the processing unit (40).
16. System (30) according to claim 15, characterized in that the transponder module (31) is arranged on a ski boot of the competitor.
17. System (30) according to any of claims 14 to 16, characterized in that the system includes a ranking display unit (39).

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