Driver posture detection device and method

Abstract

The present invention pertains to a driver attitude detection device and a driver attitude detection method which can detect the attitude of a driver on a saddle-type vehicle. This driver attitude detection device comprises: at least two wireless receivers which are mounted to a saddle-type vehicle and which each have a plurality of antennas; at least one wireless transmitter mounted to an article worn by a driver of the saddle-type vehicle; a direction calculation unit that calculates the direction of the wireless transmitter with respect to the wireless receivers on the basis of phase information about a radio wave which is from the wireless transmitter and is received by the wireless receivers; a position calculation unit that calculates the position of the wireless transmitter with respect to the wireless receivers on the basis of direction data calculated by the direction calculation unit; and an attitude calculation unit that calculates the attitude of the driver with respect to the saddle-type vehicle on the basis of position data calculated by the position calculation unit.

Description

【Technical Field】 【0001】 The present invention relates to a driver posture detection device and a driver posture detection method that can detect various postures of a driver by using a wireless communication device attached to a saddle-type vehicle and the driver's clothing. 【Background Art】 【0002】 As a technology applied to saddle-type vehicles (e.g., motorcycles, bicycles, etc.), there is a known technology in which a communication device that includes a handle grip portion directly touched by a driver within a communicable range and an NFC communication device provided on gloves worn by the driver communicate with each other to perform non-contact power supply to the NFC communication device (see, for example, Patent Document 1). According to this technology, data transferred from a portable terminal is stored in a memory via the NFC communication device, and setting values used for various controls of a motorcycle can be taken in from the portable terminal based on these stored data. 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 International Publication No. 2015 / 064246 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 However, with such a communication technology, although it is possible to determine the contact state between the driver and the vehicle, it is not possible to determine the posture of the driver on the vehicle. Particularly in saddle-type vehicles such as motorcycles, since the weight ratio of the driver to the vehicle weight is larger than that of four-wheel automobiles, etc., the behavior of the vehicle body during driving greatly depends on the posture of the driver. For this reason, a wireless communication technology for determining the posture of the driver on the vehicle and applying the result to various controls of the vehicle has been desired. 【0005】 The present invention was made against the background of the above-mentioned problems, and aims to provide a driver posture detection device and a driver posture detection method that can accurately detect the driver's posture in a saddle-type vehicle with low power consumption. [Means for solving the problem] 【0006】 The driver posture detection device according to the present invention is mounted on a saddle-type vehicle and comprises at least two wireless receivers having multiple antennas, at least one wireless transmitter attached to the wear of the driver of the saddle-type vehicle, a direction calculation unit that calculates the direction of the wireless transmitter relative to the wireless receiver based on phase information of radio waves from the wireless transmitter received by the wireless receiver, a position calculation unit that calculates the position of the wireless transmitter relative to the wireless receiver based on the direction data calculated by the direction calculation unit, and a posture calculation unit that calculates the driver's posture relative to the saddle-type vehicle based on the position data calculated by the position calculation unit. 【0007】 Furthermore, the driver posture detection device according to the present invention comprises: at least one wireless receiver mounted on a saddle-type vehicle; at least two wireless transmitters mounted on the wear of the driver of the saddle-type vehicle and having multiple antennas; a direction calculation unit that calculates the direction of the wireless transmitter relative to the wireless receiver based on phase information of radio waves from the wireless transmitter received by the wireless receiver; a position calculation unit that calculates the position of the wireless transmitter relative to the wireless receiver based on the direction data calculated by the direction calculation unit; and a posture calculation unit that calculates the driver's posture relative to the saddle-type vehicle based on the position data calculated by the position calculation unit. 【0008】 Furthermore, the driver posture detection method according to the present invention is a driver posture detection method for detecting the posture of a driver riding in a saddle-type vehicle, and comprises: a transmission step of transmitting unmodulated radio waves for a certain period of time from a wireless transmitter attached to the wear of the driver of the saddle-type vehicle; a reception step of receiving unmodulated radio waves in at least two wireless receivers attached to the saddle-type vehicle and having a plurality of antennas; a direction calculation step of calculating the direction of the wireless transmitter relative to the wireless receiver based on the phase information of the radio waves from the wireless transmitter received by the wireless receiver; a position calculation step of calculating the position of the wireless transmitter relative to the wireless receiver based on the direction data calculated in the direction calculation step; and a posture calculation step of calculating the driver's posture relative to the saddle-type vehicle based on the position data calculated in the position calculation step. 【0009】 Furthermore, the driver posture detection method according to the present invention is a driver posture detection method for detecting the posture of a driver riding in a saddle-type vehicle, and comprises: a transmission step of transmitting unmodulated radio waves for a certain period of time from at least two wireless transmitters having multiple antennas and attached to the wear of the driver of the saddle-type vehicle; a reception step of receiving unmodulated radio waves in a wireless receiver attached to the saddle-type vehicle; a direction calculation step of calculating the direction of the wireless transmitter relative to the wireless receiver based on the phase information of the radio waves from the wireless transmitter received by the wireless receiver; a position calculation step of calculating the position of the wireless transmitter relative to the wireless receiver based on the direction data calculated in the direction calculation step; and a posture calculation step of calculating the driver's posture relative to the saddle-type vehicle based on the position data calculated in the position calculation step. [Effects of the Invention] 【0010】 In the driver attitude detection device and method according to the present invention, the direction of the wireless transmitter relative to the wireless receiver is calculated based on the phase information of the radio waves from the wireless transmitter received by the wireless receiver, and the driver's attitude relative to the saddle-type vehicle is calculated based on the position data calculated based on the direction data. Therefore, the driver's attitude relative to the saddle-type vehicle can be detected accurately and with low power consumption. [Brief explanation of the drawing] 【0011】 [Figure 1] This figure shows an example of how the driver posture detection device according to the present invention is mounted on a motorcycle. [Figure 2] This figure shows an example of the arrangement of wireless transmitters in the driver's clothing of the driver posture detection device according to the present invention. [Figure 3] This diagram shows the mechanism for calculating the position of the wireless transmitter relative to the wireless receiver in the driver attitude detection device according to the present invention. [Figure 4] This figure shows a system configuration diagram of the driver posture detection device according to the present invention. [Figure 5] This diagram shows the operation flow of the processing unit of the driver posture detection device according to Embodiment 1 of the present invention. [Figure 6] This diagram shows the operation flow of the processing unit of the driver posture detection device according to Embodiment 2 of the present invention. [Modes for carrying out the invention] 【0012】 The driver posture detection device and driver posture detection method according to the present invention will be described below with reference to the drawings. 【0013】 The configurations and operations described below are merely examples, and the driver posture detection device according to the present invention is not limited to such configurations and operations. 【0014】 For example, the following explanation describes the case where the saddle-type vehicle is a motorcycle, but the saddle-type vehicle may also be a bicycle or a three-wheeled vehicle. 【0015】 Furthermore, similar or identical explanations have been simplified or omitted as appropriate. Also, in each figure, identical or similar parts are denoted by the same reference numerals. Additionally, detailed structural elements have been simplified or omitted as appropriate. 【0016】 The driver posture detection device 1 will be described below. 【0017】 <Configuration of the driver posture detection device> The configuration of the driver posture detection device 1 will be described. FIG. 1 is a diagram showing the mounted state of the driver posture detection device 1 according to the present invention on a motorcycle. 【0018】 As shown in FIGS. 1 and 2, the driver posture detection device 1 includes wireless receivers 21, 22, 23, 24, 25, 26 mounted on the motorcycle 100, wireless transmitters 11, 12, 13, 14, 15, 16, 17 worn on the driver's clothing, and a processing unit 30. FIG. 1 is a view of the motorcycle 100 seen from above, and FIG. 2 is a view of the motorcycle 100 seen from the side. 【0019】 When the angle of arrival (AoA) is adopted as the direction detection method for each of the wireless receivers 21, 22, 23, 24, 225, 26, an antenna array equipped with a plurality (at least two) of antennas is attached. Since there is a predetermined distance between the antennas of each wireless receiver, signals with different phases can be received, and the angle can be calculated from the phase difference. On the other hand, when the angle of departure (AoD) is adopted as the direction detection method, the wireless receivers 21, 22, 23, 24, 25, 26 are equipped with a single antenna. In this case, an antenna array equipped with a plurality of antennas is attached to each of the wireless transmitters 11, 12, 13, 14, 15, 16, 17. 【0020】 The wireless device including the wireless receiver and the wireless transmitter has a direction detection extension function that enables position tracking. For example, BLE (Bluetooth (registered trademark) Low Energy) is applied. At least one of the wireless receiver and the wireless transmitter has at least two or more antennas, and based on the phase difference of the radio waves received between different antennas, the direction of the wireless transmitter is determined. The method for determining the position of a wireless transmitter relative to a wireless receiver using BLE, etc., will be described in detail later. 【0021】 In the example shown in Figure 1, three wireless receivers 21, 22, and 23 are positioned at equal intervals on the left grip of the handlebars, and three wireless receivers 24, 25, and 26 are positioned at equal intervals on the right grip of the handlebars. The positions of the wireless receivers 21, 22, 23, 24, 25, and 26 on the motorcycle 100 are stored in advance in the storage unit 35 of the processing unit 30. Note that the position of the wireless receivers is not limited to the grips; they may be placed in other locations fixed to the motorcycle 100, for example, inside the cluster panel 40. 【0022】 The wireless transmitters 11, 12, and 13 are positioned on the helmet worn by the driver. In the example shown in Figure 1, the wireless transmitters 12 and 13 are positioned symmetrically on the front of the helmet, and the wireless transmitter 11 is positioned in the rear center of the helmet. The positions of the wireless transmitters 11, 12, and 13 are not limited to those shown in Figure 1, but it is desirable that at least two or more wireless transmitters be positioned symmetrically on the left and right in order to determine the driver's line of sight. The wireless transmitter 14 is attached to the glove 60 worn by the driver, and in the example shown in Figure 1, it is positioned on the back of the driver's hand. Furthermore, the wireless transmitters 15, 16, and 17 are positioned on the rider's suit worn by the driver, and in the example shown in Figure 2, they are positioned at the driver's wrists, knees, and waist, respectively. Determining whether the driver is gripping the handlebars, straddling the seat with both knees, or seated on the seat has a significant impact on calculating the driver's center of gravity, so it is preferable that the wireless transmitters 15, 16, and 17 are positioned on the rider's suit at the locations corresponding to the driver's wrists, knees, and waist. 【0023】 Next, using Figure 3, we will describe in detail the mechanism of direction calculation by a wireless device including a wireless receiver and a wireless transmitter, and the method for calculating the distance between the wireless receiver and the wireless transmitter. 【0024】 There are two methods for determining the direction of a signal: Angle of Arrival (AoA) and Angle of Departure (AoD). Both AoA and AoD require an antenna array consisting of multiple antennas. 【0025】 In the AoA method shown in Figure 3a, the device whose direction is being determined (i.e., the radio transmitter 11) emits unmodulated radio waves from a single antenna, similar to a tag in a Real-Time Location System (RTLS) solution. The radio receiver 21 needs to have multiple antennas, similar to a locator in an RTLS solution. Based on this IQ sample, the direction calculation unit 31 calculates the relative direction of the signal. 【0026】 Because the distances to the single antenna of the wireless transmitter 11 and the multiple antennas of the wireless receiver 21 are all different, when a signal transmitted from the single antenna of the wireless transmitter 11 reaches the multiple antennas of the wireless receiver 21, the wireless receiver 21 detects signals with different phases for each antenna. The wireless receiver 21 acquires in-phase and quadrature-level (IQ) samples of the signal by switching between the active antennas. 【0027】 In the AoD method shown in Figure 3b, the device whose direction is being determined (i.e., the radio transmitter 11) emits unmodulated radio waves from an antenna array with multiple antennas, similar to a locator beacon in an indoor positioning system (IPS) solution. The radio receiver 21 requires a single antenna, similar to a mobile phone in an IPS solution. 【0028】 When radio waves emitted from multiple antennas of the wireless transmitter 11 reach a single antenna of the wireless receiver 21, the wireless receiver 21 acquires an IQ sample. Based on this IQ sample, the direction calculation unit 31 calculates the relative direction of the signal. 【0029】 The direction detection function uses an antenna array with multiple antennas, and detects the direction of incoming radio waves by utilizing the phase information of radio waves resulting from the different locations of the antennas. The antenna array is connected to each antenna via an RF switch from a single BLE device, and the switch is rapidly switched within a certain period of time during direction detection. 【0030】 Radio waves used for normal communication are modulated to transmit digital data, and their phase is constantly changing, so a special mechanism is required for direction detection. Here, the wireless transmitter 11 sends a monotonous sine wave, and immediately after normal data communication, it enables unmodulated radio wave transmission for a certain period as a Constant Tone Extension (CTE). AoA is a method in which the antenna array of the wireless receiver 21 receives this CTE and calculates the incident angle, while AoD is a method in which the antenna array of the wireless transmitter 11 outputs the CTE and calculates the phase difference reaching the single-antenna wireless receiver to determine the angle. 【0031】 After calculating the angle of the wireless transmitter 11 relative to the wireless receiver 21 using AoA or AoD, it is necessary to calculate the distance Y between the wireless transmitter 11 and the wireless receiver 21. This calculation method will be explained using Figure 3c. Figure 3c illustrates how to calculate the distance between the wireless receiver 21 and the wireless transmitter 11, and between the wireless receiver 22 and the wireless transmitter 11, when the angle is calculated using AoA. 【0032】 Since the wireless receivers 21 and 22 are placed at arbitrary positions as shown in Figure 1, the distance X between the wireless receivers is stored in the memory unit 35 beforehand. When radio waves are received from the wireless transmitter 11, the angle α of the wireless transmitter 11 with respect to the wireless receiver 21 and the angle β of the wireless transmitter 11 with respect to the wireless receiver 22 are obtained by AoA as described above, and the angle γ can be determined (α + β + γ = 180°). Therefore, the distances Y and Z from the wireless receivers 21 and 22 to the wireless transmitter 11 can be obtained by the following sine rule. Z / sinα = Y / sinβ = X / sinγ. In this way, the direction and distance of the wireless transmitter 11 relative to the wireless receivers 21 and 22 are calculated, and the position of the wireless transmitter 11 relative to the wireless receivers 21 and 22 is determined. 【0033】 Next, the system configuration of the driver posture detection device 1 will be explained using Figure 4. The processing unit 30 includes at least a direction calculation unit 31, a position calculation unit 32, an attitude calculation unit 33, a communication unit 34, and a storage unit 35. Each part of the processing unit 30 may be housed together in a single enclosure, or it may be housed in multiple enclosures. Furthermore, some or all of the processing unit 30 may be composed of, for example, a microcontroller, a microprocessor unit, or updatable firmware, or a program module executed by commands from a CPU, etc. 【0034】 The direction calculation unit 31 acquires phase information and calculates the direction of the radio transmitter relative to the radio receiver. In AoA, it switches the antennas of each radio receiver and calculates the phase difference for each antenna, while in AoD, it extracts the timing from the received signal based on the transmitted antenna pattern and timing information and calculates the phase difference. If there are three or more antennas, the accuracy of the direction calculation can be improved by performing the same calculation on multiple antennas on the antenna array. 【0035】 The position calculation unit 32 calculates the distance between the radio transmitter and the radio receiver using the sine rule based on the direction data calculated by the direction calculation unit 31, and calculates the position of the radio transmitter relative to the radio receiver. Similar to the direction calculation unit 31, if there are three or more antennas, the accuracy of the position calculation can be improved by performing the same calculation on multiple antennas on the antenna array. 【0036】 The attitude calculation unit 33 calculates the driver's attitude relative to the motorcycle 100 by inputting the position data calculated by the position calculation unit 32 into the attitude determination model stored in the storage unit 35. Specifically, the positional information of at least one of the wireless receivers 21, 22, 23, 24, 25, and 26 of the wireless transmitters 11, 12, and 13 attached to the helmet is input to the posture determination model, and the posture calculation unit 33 determines the driver's line of sight direction from the output of the posture determination model. 【0037】 In other words, the posture determination model has an information output function that determines whether the driver is facing forward or backward relative to the motorcycle 100, based on the combination of positions of the input wireless transmitters 11, 12, and 13. Furthermore, the accuracy of the attitude determination model can be improved by performing machine learning on the attitude determination model using the position information of the wireless transmitter as input. 【0038】 Another specific example involves inputting positional information from at least one of the wireless receivers 21, 22, 23, 24, 25, and 26 of the wireless transmitter 14 attached to the driver's glove into the attitude determination model, and the attitude calculation unit 33 calculates the state of the driver's steering wheel grip from the output of the attitude determination model. In other words, the posture determination model here includes an information output function that determines whether or not the driver is holding the steering wheel, based on the position of the input wireless transmitter 14 relative to one of the wireless receivers. 【0039】 Furthermore, as another specific example, the position of the driver's center of gravity may be calculated using a posture determination model based on positional information from at least one of the wireless receivers 21, 22, 23, 24, 25, 26 of the wireless transmitters 11, 12, 13 attached to the helmet and the wireless transmitters 15, 16, 17 attached to the driver's riding suit. 【0040】 The communication unit 34 transmits the driver's posture information calculated by the posture calculation unit 33 to various vehicle control systems. If the posture calculated by the posture calculation unit 33 is in the direction of the driver's line of sight, the communication unit 34 can transmit this posture information to the driving assist system 80. If the posture calculation unit 33 recognizes, for example, that the driver's line of sight is behind the motorcycle 100, it may transmit this information to the driving assist system 80 to automatically activate the lane change assist system, which is one of the functions of the driving assist system. 【0041】 If the posture calculated by the posture calculation unit 33 matches the driver's grip on the steering wheel, the communication unit 34 can transmit this posture information to the driving assist system 80. If the posture calculation unit 33 detects, for example, that the driver is driving with their hands off the steering wheel, it can transmit this information to the driving assist system 80, which in turn allows the warning system, one of the functions of the driving assist system, to issue a warning to the driver. 【0042】 If the posture calculated by the posture calculation unit 33 is the position of the driver's center of gravity relative to the motorcycle 100, the communication unit 34 can transmit this posture information to the brake control system 90. This enables the activation of a vehicle stability brake control function that takes the driver's center of gravity into consideration. 【0043】 <Operation of the driver posture detection device> The operation of the driver's posture detection device according to Embodiment 1 will be described below. Figure 5 is a diagram showing the operation flow of the driver attitude detection device according to Embodiment 1 of the present invention. 【0044】 The driver attitude detection device 1 executes the operation flow shown in Figure 5. Note that the embodiment shown in Figure 5 is based on the angle of incidence calculation method using AoA. 【0045】 (Radio wave transmission step by wireless transmitter) In step S101, the wireless transmitter performs normal data communication and then transmits unmodulated radio waves for a certain period of time as a Constant Tone Extension (CTE). 【0046】 (Steps for receiving radio waves using a wireless receiver) In step S102, the radio receiver having multiple antennas receives unmodulated radio waves from the radio transmitter for a certain period of time as a CTE. 【0047】 (Direction calculation step of the wireless transmitter by the direction calculation unit) In step S103, the direction calculation unit calculates the incident angle, that is, the direction of the radio transmitter relative to the radio receiver, based on the phase difference of the radio waves from each antenna, using the CTE received by the multiple antennas of the radio receiver. 【0048】 (Position calculation step of the wireless transmitter by the position calculation unit) In step S104, the position calculation unit calculates the distance between the radio transmitter and the radio receiver based on the direction of the radio transmitter calculated in the direction calculation step S103. This calculates the direction of the radio transmitter relative to the radio receiver and the distance between the radio transmitter and the radio receiver, thereby determining the position of the radio transmitter relative to the radio receiver. 【0049】 (Driver's posture calculation step by the posture calculation unit) In step S105, the attitude calculation unit calculates the driver's attitude relative to the vehicle by inputting the position information of the wireless transmitter relative to the wireless receiver, which was calculated in the position calculation step S104, into the attitude determination model. 【0050】 In step S106, the communication unit 34 transmits the driver's vehicle attitude information calculated in attitude calculation step S105 to various vehicle control systems. 【0051】 <Effects of the driver posture detection device> The effects of the driver posture detection device according to Embodiment 1 will be described. According to Embodiment 1, the direction of the wireless transmitter relative to the wireless receiver is calculated using AoA. Therefore, the position of the wireless transmitter relative to the wireless receiver can be accurately calculated with low power consumption. In particular, in the case of AoA, the wireless transmitter attached to the driver's wearable equipment is a relatively low-power wireless transmitter with a single antenna, so the power load on the power supply attached to the driver's wearable equipment can be reduced. 【0052】 Next, the operation of the driver posture detection device according to Embodiment 2 will be described. The driver attitude detection device 1 executes the operation flow shown in Figure 6. Note that the embodiment shown in Figure 6 is based on the radiation angle calculation method using AoD. 【0053】 (Radio wave transmission step by wireless transmitter) In step S201, the wireless transmitter performs normal data communication and then transmits unmodulated radio waves for a certain period of time as a Constant Tone Extension (CTE). 【0054】 (Steps for receiving radio waves using a wireless receiver) In step S202, a radio receiver having a single antenna receives radio waves from radio transmitters transmitted from multiple antennas, while also receiving unmodulated radio waves for a certain period of time as a CTE. 【0055】 (Direction calculation step of the wireless transmitter by the direction calculation unit) In step S203, the direction calculation unit calculates the radiation angle, that is, the direction of the radio transmitter relative to the radio receiver, based on the phase difference from each antenna of the radio transmitter received by the single antenna of the radio receiver. 【0056】 (Position calculation step of the wireless transmitter by the position calculation unit) In step S204, the position calculation unit calculates the distance between the radio transmitter and the radio receiver based on the direction of the radio transmitter calculated in the direction calculation step S103. This calculates the direction of the radio transmitter relative to the radio receiver and the distance between the radio transmitter and the radio receiver, thereby determining the position of the radio transmitter relative to the radio receiver. 【0057】 (Driver's posture calculation step by the posture calculation unit) In step S205, the attitude calculation unit calculates the driver's attitude relative to the vehicle by inputting the position information of the wireless transmitter relative to the wireless receiver, which was calculated in the position calculation step S204, into the attitude determination model. 【0058】 In step S206, the communication unit 34 transmits the driver's vehicle attitude information calculated in attitude calculation step S205 to various vehicle control systems. 【0059】 <Effects of the driver posture detection device> The effects of the driver posture detection device according to Embodiment 2 will be explained. According to Embodiment 2, the direction of the wireless transmitter relative to the wireless receiver is calculated by AoD. Therefore, similar to the AoA case, the position of the wireless transmitter relative to the wireless receiver can be accurately calculated with low power consumption, and position calculation options other than AoA can be provided. 【0060】 Although Embodiment 1 and Embodiment 2 have been described above, the present invention is not limited to the descriptions of each embodiment. For example, the operations of each step may be performed in the time series described, or some steps may be performed simultaneously. [Explanation of symbols] 【0061】 1 Driver attitude detection device, 11-17 Wireless transmitter, 21-26 Wireless receiver, 30 Processing unit, 31 Direction calculation unit, 32 Position calculation unit, 33 Attitude calculation unit, 34 Communication unit, 35 Memory unit, 40 Cluster panel, 60 Glove, 80 Driving assist system, 90 Brake control system, 100 Motorcycle.

Claims

[Claim 1] Mounted on a saddle-type vehicle, it includes at least two radio receivers having multiple antennas, The vehicle is equipped with at least one wireless transmitter having a single antenna, which is attached to the wear of the driver of the saddle-type vehicle. A direction calculation unit that calculates the direction of the wireless transmitter relative to the wireless receiver based on the phase information of the radio waves from the wireless transmitter received by the wireless receiver, A position calculation unit calculates the position of the wireless transmitter relative to the wireless receiver based on the direction data calculated by the direction calculation unit, A posture calculation unit calculates the driver's posture relative to the saddle-type vehicle based on the position data calculated by the position calculation unit, Equipped with a communications department, The wireless transmitter is attached to the helmet worn by the driver. The attitude calculation unit calculates the driver's line of sight direction as attitude information, The communication unit transmits the attitude information to the driving assistance system in order to automatically activate the lane change assist system, which is one of the functions of the driving assistance system. Driver posture detection device. [Claim 2] It has a memory unit that stores a posture determination model, The attitude calculation unit calculates the driver's attitude by inputting the position data calculated by the position calculation unit into the attitude determination model. The driver posture detection device according to claim 1. [Claim 3] The wireless transmitter is attached to the glove worn by the driver. The driver posture detection device according to claim 1 or 2. [Claim 4] The attitude calculation unit calculates the driver's grip state on the steering wheel. The driver posture detection device according to claim 3. [Claim 5] The wireless transmitter is attached to the rider suit worn by the driver. The driver posture detection device according to claim 1 or 2. [Claim 6] The attitude calculation unit calculates the position of the driver's center of gravity relative to the saddle-type vehicle. The driver posture detection device according to claim 5. [Claim 7] The aforementioned wireless receiver is mounted on the handlebars. The driver posture detection device according to claim 1 or 2. [Claim 8] A driver posture detection method for detecting the posture of a driver riding in a saddle-type vehicle, A transmission step in which a wireless transmitter, attached to the driver's clothing and having a single antenna, transmits unmodulated radio waves for a certain period of time, In a wireless receiver mounted on the aforementioned saddle-type vehicle and having multiple antennas, the receiving step includes receiving the unmodulated radio waves, A direction calculation step of calculating the direction of the wireless transmitter relative to the wireless receiver based on the phase information of the radio waves from the wireless transmitter received by the wireless receiver, A position calculation step that calculates the position of the wireless transmitter relative to the wireless receiver based on the direction data calculated in the direction calculation step, A posture calculation step that calculates the attitude of the driver relative to the saddle-type vehicle based on the position data calculated by the position calculation step, It has a communication step, The wireless transmitter is attached to the helmet worn by the driver. The aforementioned posture calculation step calculates the driver's line of sight direction as posture information, The communication step involves transmitting the attitude information to the driving assistance system in order to automatically activate the lane change assist system, which is one of the functions of the driving assistance system. method.

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