Vehicle-mounted UWB positioning module
Patent Information
- Application Number
- CN202522281178.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-28
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-28
AI Technical Summary
[0003]目前，基于UWB的数字钥匙定位系统多为基于TOF（Time-of-Flight Module）的三边定位，需要至少三个锚点，而且，功能也相对单一，若要实现脚踢检测及或活体检测等功能，还需要增加额外锚点数量，增加了系统成本与部署复杂度
[0015]采用上述技术方案后，本实用新型实施例至少具有如下有益效果：本实用新型实施例通过采用阵列天线与UWB SOC芯片进行搭配应用，在所述阵列天线中设置的天线包括用于实现数字钥匙功能的第一天线、第二天线和第三天线以及用于实现附加检测功能的第四天线和第五天线，而UWB SOC芯片设有至少两个天线收发端口，各根所述天线与所述至少两个天线收发端口按照相应规则进行连接，当一个所述天线收发端口连接有多根所述天线时则通过相应的一分多的射频开关来实现相应连接和线路切换，从而，不仅可以单锚点实现数字钥匙功能，而且，还能通过控制射频开关进行相应线路切换实现硬件复用，达成诸如活体检测、脚踢检测等附加功能，有效拓展了模块的应用功能。
Smart Images
Figure CN224843760U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of automotive intelligent control technology, and in particular to an in-vehicle UWB positioning module. Background Technology
[0002] In recent years, automakers have begun to incorporate UWB (Ultra-WB) technology. Wideband (Ultra-Broadband) devices are integrated into the digital key solution.
[0003] Currently, most UWB-based digital key positioning systems are based on TOF (Time-of-Flight Module) trilateration, which requires at least three anchor points. Moreover, their functions are relatively limited. To achieve functions such as kick detection and / or liveness detection, additional anchor points are needed, increasing system cost and deployment complexity. Utility Model Content
[0004] The technical problem to be solved by this utility model embodiment is to provide an in-vehicle UWB positioning module that can effectively reduce the difficulty of system design and deployment.
[0005] To solve the above-mentioned technical problems, this utility model embodiment first provides the following technical solution: a vehicle-mounted UWB positioning module, comprising: A UWB SOC chip, wherein the UWB SOC chip has at least two antenna transceiver ports; and An array antenna, comprising a substrate and antennas respectively disposed on the substrate, the antennas including a first antenna, a second antenna and a third antenna for implementing digital key functions, and a fourth antenna and a fifth antenna for implementing additional detection functions, wherein the spacing between the first antenna, the second antenna and the third antenna is less than or equal to half a wavelength, and the fourth antenna and the fifth antenna maintain an effective isolation distance. The first antenna, the second antenna, and the third antenna are each connected to only one of the antenna transceiver ports, and each antenna transceiver port is connected to at least one of the first antenna, the second antenna, and the third antenna. The fourth antenna and the fifth antenna are connected to different antenna transceiver ports. A radio frequency switch with more than one minute is provided between the multiple antennas connected to the same antenna transceiver port and the corresponding antenna transceiver port.
[0006] Furthermore, the UWB SOC chip has two antenna transceiver ports. One of the antenna transceiver ports is connected to the first antenna and the fourth antenna via a first RF switch that splits the output into two. The other antenna transceiver port is connected to the second antenna, the third antenna, and the fifth antenna via a second RF switch that splits the output into three.
[0007] Furthermore, the UWB SOC chip has three antenna transceiver ports. The first antenna transceiver port is connected to the first antenna and the fourth antenna via a first RF switch that splits the signal into two. The second antenna transceiver port is connected to the third antenna and the fifth antenna via a third RF switch that splits the signal into two. The third antenna transceiver port is directly connected to the second antenna.
[0008] Furthermore, the first antenna, the second antenna, and the third antenna are circularly polarized omnidirectional antennas, and the maximum radiation directions of the first antenna, the second antenna, and the third antenna are parallel to the various directions of the horizontal plane XOY; the fourth antenna and the fifth antenna are directional linearly polarized antennas and the maximum radiation direction is perpendicular to the horizontal plane XOY in the +Z direction.
[0009] Furthermore, the first antenna, the second antenna, and the third antenna are circularly polarized directional antennas or dual-polarized directional antennas. The first antenna, the second antenna, and the third antenna are arranged parallel to the horizontal plane XOY. The fourth antenna and the fifth antenna are directional linearly polarized antennas. The maximum radiation direction of the first antenna, the second antenna, the third antenna, the fourth antenna, and the fifth antenna is the +Z direction, which is perpendicular to the horizontal plane XOY.
[0010] Furthermore, the first antenna, the second antenna, and the third antenna are circularly polarized directional antennas or dual-polarized directional antennas. The first antenna, the second antenna, and the third antenna are arranged perpendicular to the horizontal plane XOY, and the maximum radiation direction of the first antenna, the second antenna, and the third antenna is parallel to the horizontal plane XOY. The fourth antenna and the fifth antenna are directional linearly polarized antennas, and the maximum radiation direction is the +Z direction perpendicular to the horizontal plane XOY.
[0011] Furthermore, the GPIO pins of the UWB SOC chip are connected to the control pins of the first RF switch and the second RF switch respectively, and the switching of the first RF switch and the second RF switch is realized by controlling the GPIO signal.
[0012] Furthermore, the first antenna, the second antenna, and the third antenna are rotationally symmetrically distributed on the middle part of the substrate.
[0013] Furthermore, the fourth antenna and the fifth antenna are distributed on opposite sides of the substrate.
[0014] Furthermore, the fourth and fifth antennas are fed in series.
[0015] After adopting the above technical solution, the present utility model embodiment has at least the following beneficial effects: The present utility model embodiment uses an array antenna in combination with a UWB SOC chip. The antennas set in the array antenna include a first antenna, a second antenna, and a third antenna for realizing the digital key function, and a fourth antenna and a fifth antenna for realizing additional detection functions. The UWB SOC chip has at least two antenna transceiver ports. Each antenna is connected to the at least two antenna transceiver ports according to corresponding rules. When multiple antennas are connected to one antenna transceiver port, the corresponding connection and line switching are realized through a corresponding one-to-many RF switch. Thus, not only can the digital key function be realized with a single anchor point, but hardware multiplexing can also be realized by controlling the RF switch to switch the corresponding lines, achieving additional functions such as liveness detection and kick detection, effectively expanding the application functions of the module. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of an optional embodiment of the vehicle-mounted UWB positioning module of this utility model.
[0017] Figure 2 This is a schematic diagram of another optional embodiment of the vehicle-mounted UWB positioning module of this utility model.
[0018] Figure 3 This is a schematic diagram illustrating the principle of the application of the vehicle-mounted UWB positioning module of this utility model in conjunction with a handheld device and anchor points.
[0019] Figure 4 This is a schematic diagram of the application steps of an optional embodiment of the vehicle-mounted UWB positioning module of this utility model. Detailed Implementation
[0020] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present utility model and are not intended to limit the present utility model. Moreover, the embodiments and features in the embodiments of the present application can be combined with each other unless otherwise specified.
[0021] like Figure 1 and Figure 2 As shown, an optional embodiment of this utility model provides a vehicle-mounted UWB positioning module, comprising: UWB SOC chip 1, wherein the UWB SOC chip 1 has at least two antenna transceiver ports 10; and An array antenna 3 includes a substrate 30 and antennas 32 respectively disposed on the substrate 30. The antennas 32 include a first antenna 321, a second antenna 322 and a third antenna 323 for implementing digital key functions, and a fourth antenna 324 and a fifth antenna 325 for implementing additional detection functions. The spacing between the first antenna 321, the second antenna 322 and the third antenna 323 is less than or equal to half a wavelength, while the fourth antenna 324 and the fifth antenna 325 maintain an effective isolation distance. In this configuration, the first antenna 321, the second antenna 322, and the third antenna 322 are each connected to only one of the antenna transceiver ports 10, and each antenna transceiver port 10 is connected to at least one of the first antenna 321, the second antenna 322, and the third antenna 323. The fourth antenna 324 and the fifth antenna 325 are connected to different antenna transceiver ports 10. A radio frequency switch 5 is provided between the multiple antennas 32 connected to the same antenna transceiver port 10 and the corresponding antenna transceiver port 10.
[0022] This embodiment of the invention employs an array antenna 3 in conjunction with a UWB SOC chip 1. The array antenna 3 includes antennas 32 for implementing digital key functionality, a first antenna 321, a second antenna 322, and a third antenna 323, as well as a fourth antenna 324 and a fifth antenna 325 for additional detection functions. The UWB SOC chip 1 has at least two antenna transceiver ports 10. Each antenna 32 is connected to one of the at least two antenna transceiver ports 10 according to corresponding rules. When multiple antennas 32 are connected to one antenna transceiver port 10, corresponding connections and line switching are achieved through a multi-channel RF switch 5. Therefore, not only can the digital key function be implemented at a single anchor point, but hardware multiplexing can also be achieved by controlling the RF switch 5 to switch corresponding lines, enabling additional functions such as liveness detection and kick detection, effectively expanding the module's application functionality.
[0023] In one optional embodiment of this utility model, such as Figure 1As shown, the UWB SOC chip 1 has two antenna transceiver ports 10, namely: a first antenna transceiver port 101 and a second antenna transceiver port 102. The first antenna transceiver port 101 is connected to the first antenna 321 and the fourth antenna 324 via a first RF switch 51 (split from 1 to 2). The second antenna transceiver port 102 is connected to the second antenna 322, the third antenna 323, and the fifth antenna 325 via a second RF switch 52 (split from 1 to 3). This embodiment provides a specific implementation scheme for the UWB SOC chip 1 with two antenna transceiver ports 10. By reasonably configuring the connection methods between each antenna 32 and the two antenna transceiver ports 10, multiple functions such as digital keys, liveness detection, and kick detection can be effectively realized.
[0024] In one optional embodiment of this utility model, such as Figure 2 As shown, the UWB SOC chip 1 has three antenna transceiver ports: a first antenna transceiver port 101, a second antenna transceiver port 102, and a third antenna transceiver port 103. Antenna transceiver port 101 is connected to the first antenna 321 and the fourth antenna 324 via a first RF switch 51 (split into two). Antenna transceiver port 102 is connected to the third antenna 323 and the fifth antenna 325 via a third RF switch 53 (split into two). Antenna transceiver port 103 is directly connected to the second antenna 322. This embodiment is a specific implementation plan provided in conjunction with the UWB SOC chip 1 having three antenna transceiver ports 10. By reasonably configuring the connection methods between each antenna 32 and the three antenna transceiver ports 10, multiple functions such as digital keys, liveness detection, and kick detection can also be well realized.
[0025] In an optional embodiment of this utility model, the first antenna 321, the second antenna 322, and the third antenna 323 are circularly polarized omnidirectional antennas, and the maximum radiation directions of the first antenna 321, the second antenna 322, and the third antenna 323 are parallel to the various directions of the horizontal plane XOY; the fourth antenna 324 and the fifth antenna 325 are directional linearly polarized antennas, and their maximum radiation directions are perpendicular to the horizontal plane XOY in the +Z direction. This embodiment, by limiting the antenna used for the digital key function to a circularly polarized omnidirectional antenna and the antenna used for additional functions to a directional linearly polarized antenna, and by limiting the maximum radiation direction of each antenna, can achieve relatively small polarization loss and improve detection performance. Furthermore, in situations such as... Figure 1 In the embodiment shown, the UWB SOC chip 1 has two antenna transceiver ports 10, which can correspondingly generate two sets of PDOA (the first antenna 321 and the second antenna 322 form one set, and the first antenna 321 and the third antenna 323 form the third set), while in the example of Figure 3In an embodiment where the UWB SOC chip 1 has three antenna transceiver ports 10, it can also generate three sets of PDOA (the third set being the second antenna 322 and the third antenna 323), all of which can achieve 360° positioning around the vehicle from a single anchor point; while the maximum radiation direction of the fourth antenna 324 and the fifth antenna 325 is perpendicular to the horizontal plane XOY in the +Z direction, that is, towards the vehicle's seat and the ground, thus effectively realizing liveness detection and / or kick detection, and can realize an enhanced mode for liveness detection and / or kick detection. At this time, when the module is in digital key mode, if the initial liveness detection or kick detection fails, it will actively switch to the enhanced mode for a second re-inspection, improving the accuracy of the system.
[0026] In an optional embodiment of this invention, the first antenna 321, the second antenna 322, and the third antenna 323 are circularly polarized directional antennas or dual-polarized directional antennas. The first antenna 321, the second antenna 322, and the third antenna 323 are arranged parallel to the horizontal plane XOY. The fourth antenna 324 and the fifth antenna 325 are directional linearly polarized antennas. The maximum radiation direction of the first antenna 321, the second antenna 322, the third antenna 323, the fourth antenna 324, and the fifth antenna 325 is perpendicular to the horizontal plane XOY in the +Z direction. This embodiment, by limiting the antenna used for the digital key function to a circularly polarized directional antenna and the antenna used for additional functions to a directional linearly polarized antenna, and by limiting the maximum radiation direction corresponding to each antenna 32, can also achieve relatively small polarization loss, ensuring detection performance, and generating two or three sets of PDOA, and providing an enhanced mode for liveness detection and / or kick detection.
[0027] In an optional embodiment of this invention, the first antenna 321, the second antenna 322, and the third antenna 323 are circularly polarized directional antennas or dual-polarized directional antennas. The first antenna 321, the second antenna 322, and the third antenna 323 are arranged perpendicular to the horizontal plane XOY, and their maximum radiation directions are parallel to the horizontal plane XOY. The fourth antenna 324 and the fifth antenna 325 are directional linearly polarized antennas, and their maximum radiation direction is in the +Z direction, perpendicular to the horizontal plane XOY. This embodiment, by limiting the antenna used for the digital key function to a circularly polarized directional antenna or a dual-polarized directional antenna, and the antenna used for additional functions to a directional linearly polarized antenna, and by limiting the maximum radiation direction corresponding to each antenna 32, can also achieve relatively small polarization loss, ensuring detection performance, and generating two or three sets of PDOA, and providing an enhanced mode for liveness detection and / or kick detection.
[0028] In an optional embodiment of this invention, the GPIO pins of the UWB SOC chip 1 are connected to the control pins of the RF switches 5, and the switching of the RF switches 5 is achieved by controlling the GPIO signals. This invention connects the GPIO pins of the UWB SOC chip 1 to the control pins of each of the RF switches 5, allowing the switching of the RF switches 5 to be achieved by controlling the GPIO signals, which is convenient and the circuit is simple. In specific implementations, the UWB SOC chip 1 uses its built-in MCU controller or an external MCU controller, and defines the GPIO output signals through software algorithms to control the on / off switching of each of the RF switches 5.
[0029] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the first antenna 321, the second antenna 322, and the third antenna 323 are rotationally symmetrically distributed on the middle part of the substrate 30. This embodiment achieves a compact structure and better detection performance by rotationally symmetrically distributing the first antenna 321, the second antenna 322, and the third antenna 323 on the middle part of the substrate 30.
[0030] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the fourth antenna 324 and the fifth antenna 325 are distributed on opposite sides of the substrate 30. In this embodiment, by distributing the fourth antenna 324 and the fifth antenna 325 on opposite sides of the substrate 30, the fourth antenna 324 and the fifth antenna 325 can have the greatest possible isolation, achieving effective isolation and ensuring the implementation of the corresponding additional detection functions.
[0031] In an optional embodiment of this invention, the fourth antenna 324 and the fifth antenna 325 are fed in series. This embodiment, by designing the fourth antenna 324 and the fifth antenna 325 to be fed in series for antenna pattern synthesis, facilitates the achievement of high gain.
[0032] The vehicle-mounted UWB positioning module provided in this embodiment of the utility model is used in conjunction with the handheld device 6. In specific applications, such as... Figure 3 As shown, the handheld device 6 typically consists of a BLE module 61 and a handheld UWB module 62. The BLE module 61 is mainly used to communicate with the anchor points via Bluetooth (e.g., the BLE module 21 of the main control anchor point 2, the BLE module 42 of the sub-anchor points, etc.) to wake up the corresponding module, and then verify the identity through the SE module 22 to achieve UWB secure ranging and positioning.
[0033] The technical solution provided by this utility model embodiment requires only one anchor point (master anchor point) to realize digital key, liveness detection, and kick detection; in addition, it can be customized according to different needs. Figure 3 The layout is flexible and can be freely expanded. If there are multiple anchor points, all the sub-anchor points 4 are connected to the CAN bus through the communication module 41, and then connected to the CAN communication module 25 of the main control anchor point 2. Thus, the distance and angle measurement information of the sub-anchor points 4 are transmitted to the data acquisition module 23 of the main control anchor point 2 via the CAN bus and CAN communication module 25 for aggregation, and then further calculated by the calculation module 24.
[0034] like Figure 4 As shown, the specific working principle and process of this vehicle-mounted UWB positioning module are as follows: When the tag on the handheld device approaches the vehicle, the vehicle-mounted UWB positioning module establishes a Bluetooth communication link with the tag through the BLE module to complete authentication and verify identity; subsequently, the vehicle-mounted UWB module begins to perform safe distance measurement and angle measurement; in the presence of sub-anchor points, the sub-anchor point signals are also aggregated to the main control anchor point for calculation, and the welcome / unlock / start functions are performed according to the preset distance; when driving ends and the tag on the handheld device moves away from the vehicle, the vehicle-mounted UWB positioning module simultaneously performs distance measurement and radar mode to perform safe distance measurement and liveness detection. If a child is detected before locking and no adult is present, an alarm will be sounded; if no child is detected... If a child is detected, the radio frequency switch 5 switches to the connection between the fourth antenna 324 and the fifth antenna 325, activating the enhanced child presence detection (CPD) mode for a second check. According to relevant industry technical specifications / standards, it is necessary to confirm whether a child is detected in the cabin within a specified time (e.g., 15 seconds). If a child is detected, an alarm is issued. After the alarm lasts for a predetermined time (e.g., 1-3 minutes), the enhanced liveness detection mode is exited, and the radio frequency switch 5 returns to the digital key mode corresponding to the connection between the first antenna 321, the second antenna 322, and the third antenna 323, to wait for the next safe ranging connection. If no child is detected, the radio frequency switch 5 directly returns to the digital key mode to wait for the next safe ranging connection.
[0035] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many variations under the guidance of the present invention without departing from the inventive spirit and the scope of protection of the claims. These variations are all within the protection scope of the present invention.
Claims
1. A vehicle-mounted UWB positioning module, comprising a UWB SOC chip, said UWB SOC chip having at least two antenna transceiver ports; characterized in that, The module also includes: An array antenna, comprising a substrate and antennas respectively disposed on the substrate, the antennas including a first antenna, a second antenna and a third antenna for implementing digital key functions, and a fourth antenna and a fifth antenna for implementing additional detection functions, wherein the spacing between the first antenna, the second antenna and the third antenna is less than or equal to half a wavelength, and the fourth antenna and the fifth antenna maintain an effective isolation distance. The first antenna, the second antenna, and the third antenna are each connected to only one of the antenna transceiver ports, and each antenna transceiver port is connected to at least one of the first antenna, the second antenna, and the third antenna. The fourth antenna and the fifth antenna are connected to different antenna transceiver ports. A radio frequency switch with more than one minute is provided between the multiple antennas connected to the same antenna transceiver port and the corresponding antenna transceiver port.
2. The vehicle-mounted UWB positioning module as described in claim 1, characterized in that, The UWB SOC chip has two antenna transceiver ports. One of the antenna transceiver ports is connected to the first antenna and the fourth antenna via a first RF switch that splits the output into two. The other antenna transceiver port is connected to the second antenna, the third antenna, and the fifth antenna via a second RF switch that splits the output into three.
3. The vehicle-mounted UWB positioning module as described in claim 1, characterized in that, The UWB SOC chip has three antenna transceiver ports. The first antenna transceiver port is connected to the first antenna and the fourth antenna via a first RF switch that splits the signal into two. The second antenna transceiver port is connected to the third antenna and the fifth antenna via a third RF switch that splits the signal into two. The third antenna transceiver port is directly connected to the second antenna.
4. The vehicle-mounted UWB positioning module as described in claim 1, 2, or 3, characterized in that, The first, second, and third antennas are circularly polarized omnidirectional antennas, and their maximum radiation directions are parallel to various directions of the horizontal plane; the fourth and fifth antennas are directional linearly polarized antennas, and their maximum radiation direction is perpendicular to the XOY direction of the horizontal plane in the +Z direction.
5. The vehicle-mounted UWB positioning module as described in claim 1, 2, or 3, characterized in that, The first, second, and third antennas are circularly polarized directional antennas or dual-polarized directional antennas. The first, second, and third antennas are arranged parallel to the horizontal plane XOY. The fourth and fifth antennas are directional linearly polarized antennas. The maximum radiation direction of the first, second, and third antennas, as well as the fourth and fifth antennas, is perpendicular to the horizontal plane XOY in the +Z direction.
6. The vehicle-mounted UWB positioning module as described in claim 1, 2, or 3, characterized in that, The first, second, and third antennas are circularly polarized directional antennas or dual-polarized directional antennas. The first, second, and third antennas are arranged perpendicular to the horizontal plane XOY, and the maximum radiation direction of the first, second, and third antennas is parallel to the horizontal plane XOY. The fourth and fifth antennas are directional linearly polarized antennas, and the maximum radiation direction is the +Z direction perpendicular to the horizontal plane XOY.
7. The vehicle-mounted UWB positioning module as described in claim 2, characterized in that, The GPIO pins of the UWB SOC chip are connected to the control pins of the first RF switch and the second RF switch, respectively, and the switching of the first RF switch and the second RF switch is realized by controlling the GPIO signal.
8. The vehicle-mounted UWB positioning module as described in claim 1, 2, or 3, characterized in that, The first antenna, the second antenna, and the third antenna are rotationally symmetrically distributed on the middle part of the substrate.
9. The vehicle-mounted UWB positioning module as described in claim 1, 2, or 3, characterized in that, The fourth antenna and the fifth antenna are located on opposite sides of the substrate.
10. The vehicle-mounted UWB positioning module as described in claim 9, characterized in that, The fourth and fifth antennas are fed in series.