A method and system for positioning a mobile terminal inside a vehicle based on UWB

Abstract

The application provides a UWB-based positioning method and positioning system for a vehicle interior mobile terminal, and the positioning method comprises the following steps: S1, the mobile terminal is connected with the vehicle in communication; S2, a first UWB module and a second UWB module are arranged on the vehicle roof, and the straight-line distance between the two modules is recorded as D1; when the vehicle is running, the first UWB module and the second UWB module measure the straight-line distances between the two modules and the mobile terminal respectively, and the distances are recorded as D2 and D3 respectively; S3, the first UWB module, the second UWB module and the position of the mobile terminal form a triangle, and a triangular algorithm is used to calculate the distance between the mobile terminal and the vehicle roof according to D1, D2 and D3, and further calculate the height H1 of the mobile terminal relative to the vehicle chassis; and S4, when the height H1 is greater than a first preset height h1, the vehicle sends an alarm. The positioning method in the application is more accurate and rapid, has low cost, and can effectively ensure driving safety.

Description

Technical Field

[0001] This invention relates to a positioning method for a mobile terminal, and more particularly to a UWB-based positioning method for a mobile terminal inside a vehicle. Background Technology

[0002] With the rapid growth of the social economy, the automotive industry in China has also developed rapidly, and cars have become a common necessity in Chinese households. How to detect whether a driver is holding a mobile phone while driving to reduce driving risks has become an urgent problem to be solved. Current technology typically uses in-vehicle smart cameras to identify whether the driver is holding a phone, but this solution is too costly and difficult to promote.

[0003] To address the aforementioned technical issues, this invention employs UWB technology for high-precision positioning of the relative position of a mobile terminal within a vehicle. Based on the relative position of the mobile terminal within the vehicle, it determines whether the driver is holding the mobile terminal and making a call. If the driver is seen holding a mobile terminal and making a call while driving past another vehicle, the vehicle will promptly issue a reminder. Summary of the Invention

[0004] To overcome the aforementioned technical deficiencies, the present invention aims to provide a UWB-based method for locating mobile terminals inside vehicles, specifically comprising:

[0005] S1: The mobile terminal is communicatively connected to the vehicle;

[0006] S2: The first UWB module and the second UWB module are respectively installed on the roof of the vehicle, and the straight-line distance between them is denoted as D1. When driving, the first UWB module and the second UWB module respectively measure their straight-line distances to the mobile terminal, and denoted as D2 and D3 respectively.

[0007] S3: The positions of the first UWB module, the second UWB module and the mobile terminal form a triangle. The triangle algorithm calculates the distance of the mobile terminal relative to the vehicle roof based on D1, D2 and D3, and further calculates the height H1 of the mobile terminal relative to the vehicle chassis.

[0008] S4: When the height H1 is greater than the first preset height h1, the vehicle issues an alarm.

[0009] Preferably, S1: The mobile terminal is communicatively connected to the vehicle: The mobile terminal sends a ranging request to the vehicle, and the first UWB module responds to the mobile terminal and is communicatively connected to the mobile terminal;

[0010] S2: When driving, the first UWB module and the second UWB module respectively send UWB electromagnetic signals to the mobile terminal. The mobile terminal receives the UWB electromagnetic signals and sends UWB response signals to the first UWB module and the second UWB module respectively. The straight-line distances between the first UWB module, the second UWB module and the mobile terminal are calculated using TOF technology and are denoted as D2 and D3 respectively.

[0011] Preferably, S4: When the height H1 is greater than the first preset height h1, the vehicle issues an alarm;

[0012] S5: Repeat S2-S3 to calculate the current height H2 of the mobile terminal relative to the vehicle chassis, and simultaneously detect the current vehicle speed.

[0013] The alarm is deactivated when the current height H2 is less than the second preset height h2 and / or the vehicle speed is lower than the first preset speed.

[0014] Preferably, in step S4: when the height H1 is greater than the first preset height h1, the vehicle issues an alarm; when the height H1 is not greater than the first preset height h1, the process returns to step S1.

[0015] S5: Repeat S2-S3 to calculate the current height H2 of the mobile terminal relative to the vehicle chassis, and simultaneously detect the current vehicle speed; when the current height H2 is less than the second preset height h2 and / or the vehicle speed is lower than the first preset speed, the alarm is deactivated; when the vehicle speed is not lower than the first preset speed, the vehicle alarm is triggered.

[0016] Preferably, the first preset speed is 5 km / h.

[0017] In another aspect, the present invention provides a vehicle in-vehicle mobile terminal positioning system based on UWB signals, including an in-vehicle UWB module, including a first UWB module and a second UWB module, which are respectively installed on the roof of the vehicle, and the straight-line distance between them is denoted as D1. When driving, the first UWB module and the second UWB module are used to measure the straight-line distance between themselves and the mobile terminal, which are denoted as D2 and D3 respectively.

[0018] The calculation module, in which the positions of the first UWB module, the second UWB module and the mobile terminal form a triangle, calculates the distance of the mobile terminal relative to the vehicle roof based on D1, D2 and D3, and further calculates the height H1 of the mobile terminal relative to the vehicle chassis.

[0019] The alarm module issues an alarm when the height H1 is greater than the first preset height h1.

[0020] Preferably, the mobile terminal sends a ranging request to the first UWB module, and the first UWB module responds to the mobile terminal, establishing a communicative connection. The first UWB module and the second UWB module are respectively installed on the vehicle roof. During driving, the first UWB module and the second UWB module respectively send UWB electromagnetic signals to the mobile terminal. The mobile terminal receives the UWB electromagnetic signals and sends UWB response signals to the first UWB module and the second UWB module respectively. The straight-line distances between the first UWB module, the second UWB module, and the mobile terminal are calculated using Time-of-Flight (TOF) technology and denoted as D2 and D3 respectively.

[0021] Preferably, the system also includes a speed measurement module. When the alarm module issues an alarm, the calculation module further calculates the current height H2 of the mobile terminal relative to the vehicle chassis, and the speed measurement module detects the current vehicle speed. When the current height H2 is less than a second preset height h2 and / or the vehicle speed is lower than a first preset speed, the alarm module cancels the alarm.

[0022] Preferably, when the height H0 is greater than the first preset height h1, the alarm module issues an alarm; when the height H1 is not greater than the first preset height h1, the mobile terminal continues to send a ranging request to the first UWB module; when the alarm module issues an alarm, the calculation module further calculates the current height H2 of the mobile terminal relative to the vehicle chassis, and the speed measurement module detects the current vehicle speed; when the current height H2 is less than the second preset height h2 and / or the vehicle speed is lower than the first preset speed, the alarm module cancels the alarm; when the vehicle speed is not lower than the first preset speed, the alarm module is triggered to issue an alarm.

[0023] Preferably, the first preset speed is 5 km / h.

[0024] Using the vehicle interior mobile terminal positioning method of the present invention, the relative position of the mobile terminal inside the vehicle can be accurately located, and the cost is low, it is easy to implement, and it can effectively ensure driving safety. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a UWB-based in-vehicle mobile terminal positioning method according to an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of another UWB-based in-vehicle mobile terminal positioning method conforming to an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of another UWB-based in-vehicle mobile terminal positioning method conforming to an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram of a vehicle in-vehicle mobile terminal positioning system based on UWB signals, as described in an embodiment of the present invention.

[0029] Figure 5 This is a schematic diagram of another vehicle in-vehicle mobile terminal positioning system based on UWB signals, which conforms to another embodiment of the present invention.

[0030] Figure label:

[0031] D1 - The straight-line distance between the first UWB module and the second UWB module;

[0032] D2 - The straight-line distance between the first UWB module and the mobile terminal;

[0033] D3 - The straight-line distance between the second UWB module and the mobile terminal;

[0034] H - Distance between the mobile terminal and the vehicle roof;

[0035] H1 - The height of the mobile terminal relative to the vehicle chassis;

[0036] H2 - The current height of the mobile terminal relative to the vehicle chassis;

[0037] h1 - First preset height;

[0038] h2 - Second preset height. Detailed Implementation

[0039] The advantages of the present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments.

[0040] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0041] Figure 1 This is a schematic diagram of a UWB-based in-vehicle mobile terminal positioning method conforming to the present invention. The positioning method in this embodiment includes the following steps:

[0042] S1: The mobile terminal is communicatively connected to the vehicle;

[0043] S2: The first UWB module and the second UWB module are respectively installed on the roof of the vehicle, and the straight-line distance between them is denoted as D1. When driving, the first UWB module and the second UWB module respectively measure their straight-line distances to the mobile terminal, and denoted as D2 and D3 respectively.

[0044] S3: The positions of the first UWB module, the second UWB module and the mobile terminal form a triangle. The triangle algorithm calculates the distance of the mobile terminal relative to the vehicle roof based on D1, D2 and D3, and further calculates the height H1 of the mobile terminal relative to the vehicle chassis.

[0045] S4: When the height H1 is greater than the first preset height h1, the vehicle issues an alarm.

[0046] Preferred, Figure 2 This is a schematic diagram illustrating the communication connection between a mobile terminal and a vehicle in another embodiment of the present invention. The mobile terminal sends a distance measurement request to the vehicle, and the first UWB module responds to the mobile terminal, establishing a communication connection. During driving, the first UWB module and the second UWB module respectively send UWB electromagnetic signals to the mobile terminal. The mobile terminal receives the UWB electromagnetic signals and sends UWB response signals to the first and second UWB modules respectively. The straight-line distances between the first and second UWB modules and the mobile terminal are calculated using Time-of-Flight (TOF) technology and denoted as D2 and D3 respectively.

[0047] The mobile terminal sends a ranging request to the vehicle. This ranging request may also include a key that matches the vehicle. When the vehicle receives the ranging request, it first verifies the key. If the key matches, the UWB module is then activated. This not only improves the matching accuracy between the vehicle and the mobile terminal and enhances the accuracy of the positioning method, but also avoids keeping the UWB module constantly active, thus preventing wasted vehicle power and saving energy.

[0048] After the first UWB module is activated, it sends a signal indicating successful matching or connection to the mobile terminal. During driving, the first and second UWB modules respectively send UWB electromagnetic signals to the mobile terminal, which responds to the respective modules. The straight-line distance between the mobile terminal and the first and second UWB modules can be calculated using Time-of-Flight (TOF) technology. Upon receiving the signal from the mobile terminal, the first and second UWB modules can first determine whether the mobile terminal is inside the vehicle, using either distance information or the vehicle's current speed. If the vehicle is in motion, the mobile terminal is assumed to be inside the vehicle.

[0049] The TOF technology, or Time-of-Flight technology, involves a sensor calculating the time difference and phase difference between the emission and reflection of light, thereby determining the distance to a target object.

[0050] Furthermore, Figure 3 As shown in the preferred embodiment of the positioning method, when the height H1 is greater than the first preset height h1, the alarm module issues an alarm; when the height H1 is not greater than the first preset height h1, the mobile terminal continues to send a ranging request to the first UWB module; when the alarm module issues an alarm, the calculation module further calculates the current height H2 of the mobile terminal relative to the vehicle chassis, and the speed measurement module detects the current vehicle speed; when the current height H2 is less than the second preset height h2 and / or the vehicle speed is lower than the first preset speed, the alarm module cancels the alarm; when the vehicle speed is not lower than the first preset speed, the alarm module is triggered to issue an alarm.

[0051] This method allows for real-time monitoring of whether the mobile terminal inside the vehicle is above a preset height. When the mobile terminal's height exceeds the preset height, the vehicle issues an alarm and continuously monitors whether the mobile terminal's position is promptly lowered to within the preset height due to the alarm. Simultaneously, to avoid misjudgment or emergencies, the vehicle's current speed is also detected. If the mobile terminal's height does not decrease promptly due to the alarm, and the vehicle speed is not lower than a preset speed, it means the driver is using the mobile terminal while driving at high speed, and the alarm module will immediately sound an alarm.

[0052] When it is initially determined that the mobile terminal is higher than the preset height, the vehicle can continuously monitor the height of the mobile terminal and, in conjunction with the current vehicle speed, determine whether the vehicle is in a high-risk driving state, thereby restraining and reminding the driver.

[0053] It should be understood that all preset parameters in this invention can be set and adjusted by the driver. The first preset speed can be 5 km / h, but can also be adjusted according to the driver's personal habits and current road conditions.

[0054] Accordingly, the present invention also provides a vehicle interior mobile terminal positioning system based on UWB signals, which corresponds to the above positioning method.

[0055] In one embodiment conforming to the present invention, the positioning system of the in-vehicle mobile terminal includes an onboard UWB module, as referenced. Figure 4 The system includes a first UWB module and a second UWB module, which are respectively installed on the roof of the vehicle. The straight-line distance between them is denoted as D1. When the vehicle is in motion, the first UWB module and the second UWB module are used to measure the straight-line distance between themselves and the mobile terminal, which are denoted as D2 and D3 respectively.

[0056] The calculation module, in which the positions of the first UWB module, the second UWB module and the mobile terminal form a triangle, calculates the distance of the mobile terminal relative to the vehicle roof based on D1, D2 and D3, and further calculates the height H1 of the mobile terminal relative to the vehicle chassis.

[0057] The alarm module issues an alarm when the height H1 is greater than the first preset height h1.

[0058] In this embodiment, after the calculation module calculates the distance H between the mobile terminal and the vehicle roof based on D1, D2 and D3, since the height from the vehicle chassis to the vehicle roof is fixed, the value of H1 can be obtained by subtracting the distance H between the mobile terminal and the vehicle roof from this height.

[0059] In another preferred embodiment, the positioning system further includes a speed measurement module. When the alarm module issues an alarm, the calculation module further calculates the current height H2 of the mobile terminal relative to the vehicle chassis, and the speed measurement module detects the current vehicle speed. When the current height H2 is less than a second preset height h2 and / or the vehicle speed is lower than a first preset speed, the alarm module cancels the alarm.

[0060] When the height of the mobile terminal is higher than the first preset height h1, the vehicle continuously monitors the height of the mobile terminal and simultaneously triggers the speed measurement module to measure the speed. Figure 5 This diagram illustrates the relative positions of the mobile terminal and the vehicle in this embodiment. If the height of the mobile terminal relative to the vehicle chassis changes, and if the current height H2 is less than a second preset height h2 and / or the vehicle speed is lower than a first preset speed, the alarm is considered to have warned the driver. If the driver moves the mobile terminal to a safe height, the alarm module will deactivate the alarm. If the alarm does not produce the desired result, the alarm module will be further triggered to issue an alarm.

[0061] Using the positioning method and system of this invention, the relative height of the mobile terminal inside the vehicle relative to the vehicle chassis can be effectively and accurately measured. Combined with the vehicle's current speed, different levels of warnings can be issued under different circumstances. Furthermore, no additional hardware devices, cameras, or other sensors are required; the technical solution of this invention can be implemented solely through a UWB sensor, effectively reducing production costs and ensuring driving safety.

[0062] It should be noted that the embodiments of the present invention have better implementability and are not intended to limit the present invention in any way. Any person skilled in the art may use the above-disclosed technical content to change or modify it into equivalent effective embodiments. However, any modifications or equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A UWB-based method for locating mobile terminals inside vehicles, characterized in that, S1: The mobile terminal is communicatively connected to the vehicle; S2: The first UWB module and the second UWB module are respectively installed on the roof of the vehicle, and the straight-line distance between them is denoted as D1. When driving, the first UWB module and the second UWB module respectively measure their straight-line distances to the mobile terminal, and denoted as D2 and D3 respectively. S3: The positions of the first UWB module, the second UWB module, and the mobile terminal form a triangle. The triangle algorithm calculates the distance H of the mobile terminal relative to the vehicle roof based on D1, D2, and D3. The height from the vehicle chassis to the vehicle roof is fixed. Subtracting the distance H of the mobile terminal relative to the vehicle roof from this height yields the height H1 of the mobile terminal relative to the vehicle chassis. S4: When the height H1 is greater than the first preset height h1, the vehicle issues an alarm.

2. The positioning method as described in claim 1, characterized in that, S1: The mobile terminal is connected to the vehicle: The mobile terminal sends a ranging request to the vehicle, and the first UWB module responds to the mobile terminal and is connected to the mobile terminal in communication. S2: The first UWB module and the second UWB module are respectively installed on the roof of the vehicle. When the vehicle is in motion, the first UWB module and the second UWB module respectively send UWB electromagnetic signals to the mobile terminal. The mobile terminal receives the UWB electromagnetic signals and sends UWB response signals to the first UWB module and the second UWB module respectively. The straight-line distances between the first UWB module, the second UWB module and the mobile terminal are calculated by TOF technology and are denoted as D2 and D3 respectively.

3. The positioning method as described in claim 2, characterized in that, S4: When the height H1 is greater than the first preset height h1, the vehicle issues an alarm; S5: Repeat S2-S3 to calculate the current height H2 of the mobile terminal relative to the vehicle chassis, and simultaneously detect the current vehicle speed. The alarm is deactivated when the current height H2 is less than the second preset height h2 and / or the current vehicle speed is lower than the first preset speed.

4. The positioning method as described in claim 3, characterized in that, S4: When the height H1 is greater than the first preset height h1, the vehicle issues an alarm; If the height H1 is not greater than the first preset height h1, then return to S1; S5: Repeat S2-S3 to calculate the current height H2 of the mobile terminal relative to the vehicle chassis, and simultaneously detect the current vehicle speed. The alarm is deactivated when the current height H2 is less than the second preset height h2 and / or the current vehicle speed is less than the first preset speed; When the vehicle's current speed is not lower than the first preset speed, the vehicle alarm is triggered.

5. The positioning method as described in claim 4, characterized in that, The first preset speed is 5 km / h.

6. A vehicle interior mobile terminal positioning system based on UWB signals, characterized in that, The vehicle-mounted UWB module includes a first UWB module and a second UWB module, which are respectively installed on the roof of the vehicle. The straight-line distance between them is denoted as D1. When driving, the first UWB module and the second UWB module are used to measure the straight-line distance between themselves and the mobile terminal, which are denoted as D2 and D3 respectively. The calculation module is used to calculate the distance H between the mobile terminal and the positions of the first UWB module, the second UWB module, and the mobile terminal, which form a triangle. The triangle algorithm calculates the distance H between the mobile terminal and the vehicle roof based on D1, D2, and D3. The height from the vehicle chassis to the vehicle roof is fixed. The height H1 between the mobile terminal and the vehicle chassis is obtained by subtracting the distance H between the mobile terminal and the vehicle roof from this height. The alarm module issues an alarm when the height H1 is greater than the first preset height h1.

7. The positioning system as described in claim 6, characterized in that, The mobile terminal sends a ranging request to the first UWB module, and the first UWB module responds to the mobile terminal and establishes a communication connection with the mobile terminal. The first UWB module and the second UWB module are respectively installed on the roof of the vehicle. When the vehicle is in motion, the first UWB module and the second UWB module respectively send UWB electromagnetic signals to the mobile terminal. The mobile terminal receives the UWB electromagnetic signals and sends UWB response signals to the first UWB module and the second UWB module respectively. The straight-line distances between the first UWB module, the second UWB module and the mobile terminal are calculated using Time-of-Flight (TOF) technology and are denoted as D2 and D3 respectively.

8. The positioning system as described in claim 7, characterized in that, It also includes a speed measurement module. When the alarm module issues an alarm, the calculation module further calculates the current height H2 of the mobile terminal relative to the vehicle chassis, and the speed measurement module detects the current speed of the vehicle. When the current height H2 is less than the second preset height h2 and / or the current vehicle speed is lower than the first preset speed, the alarm module cancels the alarm.

9. The positioning system as described in claim 8, characterized in that, When the height H1 is greater than the first preset height h1, the alarm module issues an alarm; If the height H1 is not greater than the first preset height h1, the mobile terminal continues to send a ranging request to the first UWB module. When the alarm module issues an alarm, the calculation module further calculates the current height H2 of the mobile terminal relative to the vehicle chassis, and the speed measurement module detects the current vehicle speed; when the current height H2 is less than the second preset height h2 and / or the current vehicle speed is lower than the first preset speed, the alarm module cancels the alarm. When the vehicle's current speed is not lower than the first preset speed, the alarm module is triggered to issue an alarm.

10. The positioning system as described in claim 9, characterized in that, The first preset speed is 5 km / h.

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