CN113543079A - Multifunctional vehicle-mounted communication system and method based on Bluetooth AOA mode - Google Patents
Multifunctional vehicle-mounted communication system and method based on Bluetooth AOA mode Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00571—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by interacting with a central unit
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00896—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys specially adapted for particular uses
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- H04B5/48—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/14—Direct-mode setup
Abstract
The invention discloses a multifunctional vehicle-mounted communication system and method based on a Bluetooth AOA mode, wherein the communication system utilizes a Bluetooth transceiver to detect an adaptive mobile terminal in real time, when adaptive equipment is detected, the Bluetooth transceiver sends a signal to a central processing unit, the central processing unit obtains the position of the mobile terminal and calculates the relative distance between the mobile terminal and a vehicle body according to the position of the Bluetooth transceiver and detection signal data transmitted by the Bluetooth transceiver by combining a Bluetooth AOA technology, and compares the relative distance value with a preset range value to obtain the judgment of locking or unlocking so as to control the working mode of the Bluetooth transceiver. The invention combines the working characteristics of the Bluetooth AOA technology, utilizes a transmitting terminal to simultaneously correspond to an array antenna receiving terminal, simplifies the complexity of the whole vehicle equipment process, can realize the synchronous switching of various wireless communication functions, and obviously improves the comprehensive performance of a vehicle-mounted communication system.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted network communication, in particular to a multifunctional vehicle-mounted communication system based on a Bluetooth AOA mode.
Background
With the increasing requirements of people on automobile intellectualization, automation and comfort, wireless equipment is widely applied to modern automobiles. The most common wireless communication equipment is bluetooth, which can realize the basic entertainment functions of playing music, wireless communication and the like, and another important application is that no entity key enters (inductive switch), and a vehicle-mounted bluetooth system automatically detects the relative position of a bluetooth key (such as a smart phone) and a vehicle body, so that the vehicle door is controlled to be automatically unlocked and unlocked.
Currently, bluetooth technology has been developed to the BT5.2 standard, and one bluetooth transceiver can support both the classic bluetooth mode and the bluetooth low energy mode. Classic bluetooth's prevalence is very high, can be used for the transmission of higher data volumes such as bluetooth telephone or bluetooth music, and the AOA location mode is supported from 5.1 standards to the bluetooth low energy, has accurate directional function, has realized centimeter level positioning accuracy.
However, the current vehicle-mounted bluetooth entity-free key entry system (inductive switch system) is based on the RSSI positioning mode, the positioning accuracy is roughly positioned within 5m to 10m, and depending on the entity-free key entry system roughly positioned, the position of the smart phone detected by the vehicle has a large deviation from the actual position, so that misjudgment may occur on unlocking or unlocking of the vehicle door, and certain potential safety hazards are caused.
The RSSI locate mode based on bluetooth needs to install at least three bluetooth device and every bluetooth device all need to connect independent antenna, and the antenna distributes in the automobile body different positions. The three Bluetooth devices are only used for a keyless entry system, the Bluetooth function is single, and the Bluetooth entertainment function can be realized only by additionally adding one Bluetooth device. In this case, the plurality of bluetooth devices may increase power consumption and hardware costs, and also increase installation and wiring complexity during the entire vehicle assembly process.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides a multifunctional vehicle-mounted communication system based on a Bluetooth AOA mode, so as to solve the technical problems of low positioning accuracy and complex wiring caused by a positioning mode based on a Bluetooth RSSI (received signal strength indicator) in the prior art.
A multifunctional vehicle-mounted communication system based on a Bluetooth AOA mode is characterized by comprising a central processing unit, a Bluetooth transceiver, a radio frequency switch and an antenna module which are arranged on a vehicle body, wherein,
the Bluetooth transceiver is used for detecting whether adaptive Bluetooth mobile terminals exist around the Bluetooth transceiver, and if adaptive mobile terminal information is detected, the Bluetooth transceiver sends a wireless signal to the central processing unit;
the central processing unit is used for calculating the position of the mobile terminal according to the position of the Bluetooth transceiver and wireless signal data transmitted by the Bluetooth transceiver by combining a Bluetooth AOA technology, and judging whether the relative distance between the mobile terminal and the vehicle body meets an unlocking or locking preset value; if the unlocking preset value is met, informing a vehicle control unit to unlock, and controlling the Bluetooth transceiver to enter a Bluetooth entertainment mode; if the preset locking value is met, the vehicle control unit is informed to continue to lock, and the Bluetooth transceiver is controlled to keep a low-power Bluetooth mode;
the antenna device comprises two antenna groups, and the central processing unit controls the Bluetooth transceiver to be connected with the corresponding antenna group according to the judgment result of unlocking or locking, wherein the first antenna group corresponds to the low-power Bluetooth mode, and the second antenna group corresponds to the Bluetooth entertainment mode;
and the radio frequency switch is used for switching connection between the Bluetooth transceiver and different antenna groups.
Preferably, the first antenna group comprises more than three antenna units, and the distance between each antenna unit is equal, and the distance value does not exceed one half wavelength of the bluetooth working frequency band.
Preferably, after the bluetooth transceiver detects the adapted mobile terminal information, the bluetooth transceiver sends a control signal to control the radio frequency switch to cyclically switch among the antenna units in the first antenna group in sequence, so as to obtain a phase difference between the radio frequency signals transmitted by the mobile terminal and received by each antenna unit.
Preferably, each of the antenna units is electrically connected to the rf switch through a corresponding cable, and the lengths of the cables are equal.
Preferably, the radio frequency switch is a single-pole multi-throw switch.
Preferably, the second antenna group comprises an antenna unit, when the relative distance between the moving end and the vehicle body meets an unlocking preset value, the central processing unit controls the bluetooth transceiver to send a designated control signal, and the radio frequency switch is connected with the second antenna group in a switching mode.
Preferably, the first antenna group is arranged on a vehicle roof, the second antenna group is arranged at a central control position in a vehicle, and the central control unit is arranged on a vehicle-mounted central control system.
Preferably, the mobile terminal is provided with a bluetooth module, and the bluetooth module is used for achieving communication connection with the bluetooth transceiver in advance.
Preferably, the mobile terminal is in a mobile phone form or a vehicle key with a bluetooth module.
The second purpose of the present invention is to provide a multifunctional vehicle-mounted communication method based on bluetooth AOA mode, comprising the following steps:
(1) the method comprises the following steps that a Bluetooth module of a mobile terminal is used for achieving communication connection with a Bluetooth transceiver configured on a vehicle body in advance;
(2) opening a Bluetooth module of a mobile terminal and approaching the detection range of a Bluetooth transceiver;
(3) the Bluetooth transceiver sends the detected adaptive signal to the central processing unit, and the central processing unit calculates the position of the mobile end according to the position of the Bluetooth transceiver and detection signal data transmitted by the Bluetooth transceiver by combining a Bluetooth AOA technology and judges whether the relative distance between the mobile end and the vehicle body meets an unlocking or locking preset value;
(3.1) if the unlocking preset value is met, the central processing unit informs the vehicle control unit to unlock, and controls the Bluetooth transceiver to enter a Bluetooth entertainment mode through switching of the radio frequency switch, so that the Bluetooth transceiver is used for transmitting high data volume such as Bluetooth telephone or Bluetooth music;
and (3.2) if the preset locking value is met, informing the vehicle control unit to continuously lock, controlling the Bluetooth transceiver to keep a low-power-consumption Bluetooth mode, and sensing the entry of the entity-free key into the system.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes multiple functions of waking up the vehicle in medium and short distance, entering without key, blue tooth entertainment and the like through the central processing unit, the blue tooth transceiver, the radio frequency switch and the antenna device. Under the flameout state of the vehicle, the system automatically detects the relative position of the mobile equipment through the Bluetooth AOA technology, and judges whether to obtain unlocking or locking operation, thereby realizing full-automatic induction keyless entry; after the vehicle is started, the Bluetooth transceiver is automatically switched to the classic function modes such as Bluetooth telephone, Bluetooth music and the like under the regulation and control of the central processing unit, and the Bluetooth transceiver is adaptive to the driving environment of the vehicle.
The Bluetooth AOA mode is applied to the vehicle-mounted communication system, the working characteristics that one transmitting end simultaneously corresponds to a plurality of antenna receiving ends in the Bluetooth AOA technology are skillfully utilized, the using number of Bluetooth positioning devices is greatly reduced, and the antenna units can be intensively distributed at adjacent positions, so that the complexity of the assembly of the whole vehicle is simplified; the bluetooth AOA technique can reach centimeter-level positioning accuracy, effectively avoids the vehicle mistake unblock and locks.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of the operation of the system of the present invention;
fig. 2 is a schematic diagram of an antenna layout of the antenna device of the present embodiment;
in the figure, 10-central processor; 20-a bluetooth transceiver; 30-a radio frequency switch; 40-an antenna arrangement; 401-a first antenna group; 402-second antenna group.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, the present embodiment provides a multifunctional vehicle-mounted communication system based on bluetooth AOA mode, which includes a central processing unit 10, a bluetooth transceiver 20, a radio frequency switch 30 and an antenna module 40, wherein,
the bluetooth transceiver 20 is configured to detect whether there is an adapted bluetooth mobile terminal around, and if the adapted bluetooth mobile terminal information is detected, the bluetooth transceiver 20 sends a wireless signal to the central processing unit 10;
the central processing unit 10 is configured to calculate a position of the mobile terminal according to the position of the bluetooth transceiver 20 and the wireless signal data transmitted by the bluetooth transceiver 20 by combining a bluetooth AOA technology, and determine whether a relative distance between the mobile terminal and the vehicle body meets an unlocking or locking preset value; if the unlocking preset value is met, informing a vehicle control unit to unlock, and controlling the Bluetooth transceiver 20 to enter a Bluetooth entertainment mode; if the preset locking value is met, the vehicle control unit is informed to continue to lock, and the Bluetooth transceiver 20 is controlled to keep a low-power Bluetooth mode;
the antenna device 30 includes two antenna groups 401 and 402, and the cpu controls the bluetooth transceiver to connect to the corresponding antenna group according to the determination result of unlocking or locking, wherein the first antenna group 401 corresponds to the bluetooth low energy mode, and the second antenna group 402 corresponds to the bluetooth entertainment mode;
the radio frequency switch 30 is used for switching and connecting the bluetooth transceiver 20 with different antenna groups.
Specifically, the radio frequency switch 30 is a single-pole four-throw switch (S is used in fig. 1, and three connection states K0-K1, K0-K2, K0-K3, and K0-K4 are respectively connected to the first antenna group 401 and the second antenna group 402, respectively, where the first antenna group 401 includes three antenna units (Ant 1, Ant2, Ant3 are used in fig. 1). When the vehicle enters a flameout state from a starting state, the cpu controls the bluetooth transceiver 20 to operate in the bluetooth low energy mode, and then enters a sleep mode, where the connection state of the rf switch 30 is K0-K1. In the bluetooth low energy mode, the bluetooth transceiver 20 always detects the surrounding environment, and when the adaptive mobile terminal information is detected in the working range, the bluetooth transceiver 20 will send a signal to wake up the central processing unit, the central processing unit 10 further controls the bluetooth transceiver 20 to send an RF control signal to the RF switch 30, and the RF switch 30 sequentially and cyclically switches among K0-K1, K0-K2, and K0-K3.
The antenna units are in equidistant array, the distance value interval is controlled within 6cm, namely, the distance value interval does not exceed one half wavelength of a Bluetooth working frequency band, the switching time of the radio frequency switch 30 needs to be known, the cyclic switching connection state is used for AOA calculation compensation phase difference, the whole period ambiguity of the phase difference can be eliminated, and the positioning accuracy can be improved.
In order to measure and calculate the device position more accurately, the first antenna set 401 may further include more than three antenna units according to actual requirements, which is helpful to improve the detection accuracy, and the number of the ports of the rf switch 30 is adjusted accordingly.
The central processing unit 10 accurately calculates the position of the mobile terminal relative to the vehicle body according to the position and phase difference information of the bluetooth transceiver 20 and by combining the bluetooth AOA technology, and then judges whether the relative distance meets the unlocking or locking preset value, thereby controlling the vehicle to start or continue to close. When the vehicle is started, the central processor 10 controls the bluetooth transceiver 20 to switch to connect with the second antenna set 402, thereby entering a classic bluetooth mode.
The second antenna set 402 is an antenna unit (represented by Ant4 in the figure), and in the vehicle starting state, the connection state of the radio frequency switch is K0-K4, and at this time, the bluetooth transceiver 20 is used for transmitting higher data volume such as bluetooth telephone or bluetooth music, so as to meet the entertainment requirement of the vehicle running state.
In this embodiment, the antenna units Ant1, Ant2, Ant3 of the first antenna group 401 and the RF switch 30 are proposed to be connected by coaxial cables X1, X2, and X3, and the lengths of the respective traces are equal, so as to ensure that the transmission time of the RF bluetooth control signal in each path is equal. The antenna unit Ant4 of the second antenna set 402 is connected to the rf switch 30 by a coaxial cable X4, and the length of the cable X4 is not limited.
Referring to fig. 2, specifically, in order to further reduce the installation space and the complexity of the assembly of the entire vehicle, the bluetooth transceiver 20, the rf switch 30 and the antenna units Ant1, Ant2 and Ant3 of the first antenna group 401 are all installed at the position of the vehicle roof, and more preferably, the feeding points of the antenna units Ant1, Ant2 and Ant3 are wired with the rf switch 30 through the same PCB, so as to reduce the wiring position as much as possible. The antenna unit Ant4 and the central processing unit 10 are placed in a central control position in the vehicle.
It is supplementary to explain, the removal end is the smart mobile phone form, or is the vehicle key of taking bluetooth module certainly. As the operation foundation of the bluetooth wireless sensing work, before using the communication system, a manufacturer or a user needs to make a communication connection between the bluetooth module of the mobile terminal and the bluetooth transceiver in advance.
The low-power-consumption Bluetooth mode of the communication system preferably adopts the AOA technology of 5.2 standards, the AOA technology reaches centimeter-level positioning accuracy at present, accurate measurement and calculation of a mobile terminal can be realized, and mistaken unlocking and mistaken locking of a vehicle are avoided.
With reference to the above communication modules, a multifunctional vehicle-mounted communication method based on bluetooth AOA mode is described herein, which includes the following steps:
(1) the bluetooth module of the mobile terminal is used to achieve communication connection with the bluetooth transceiver 20 configured on the vehicle body in advance;
(2) opening the bluetooth module of the mobile terminal and approaching the detection range of the bluetooth transceiver 20;
(3) the bluetooth transceiver 20 sends the detected adaptive signal to the central processing unit 10, and the central processing unit 10 calculates the position of the mobile terminal according to the position of the bluetooth transceiver 20 and the detection signal data transmitted by the bluetooth transceiver 20 by combining the bluetooth AOA technology, and judges whether the relative distance between the mobile terminal and the vehicle body meets an unlocking or locking preset value;
(3.1) if the unlocking preset value is met, the central processing unit 10 informs the vehicle control unit to unlock, and controls the Bluetooth transceiver 20 to enter a Bluetooth entertainment mode through switching of the radio frequency switch 30, so that the Bluetooth transceiver is used for transmitting high data volume such as Bluetooth telephone or Bluetooth music;
and (3.2) if the preset locking value is met, informing the vehicle control unit to continuously lock, controlling the Bluetooth transceiver 20 to keep a low-power-consumption Bluetooth mode, and sensing the system without the entity key.
In summary, the invention utilizes the bluetooth transceiver 20 to detect the adapted mobile terminal in real time, when the adapted device is detected, the bluetooth transceiver 20 sends a signal to the central processing unit 10, the central processing unit 10 obtains the position of the mobile terminal and calculates the relative distance between the mobile terminal and the vehicle body according to the position of the bluetooth transceiver 20 and the detection signal data transmitted by the bluetooth transceiver 20 by combining the bluetooth AOA technology, and compares the relative distance value with the preset range value to obtain the judgment of locking or unlocking, thereby controlling the working mode of the bluetooth transceiver.
In the process of judging the position of the mobile terminal, the bluetooth transceiver 20 belongs to a bluetooth low energy mode, and according to the working principle of the AOA technology, the bluetooth transceiver 20 is sequentially switched with more than three antenna units in a circulating manner through the radio frequency switch 30, so that the accurate positioning of the equipment to be tested can be realized only by configuring one bluetooth transceiver 20 corresponding to different routing lines, the hardware cost and the power consumption are reduced on the design of a hardware system, the positioning accuracy cannot be influenced even if a plurality of antenna units are intensively distributed in one area (such as the position of the car roof), and the complexity of device assembly is greatly simplified;
on the basis, the radio frequency switch 30 is connected with another antenna unit, and when the unlocking decision is received, the central processing unit 10 simultaneously changes the control signal of the bluetooth transceiver 20, namely, the control signal can be switched and connected to the antenna unit, so that the bluetooth transceiver 20 conveniently enters a bluetooth entertainment mode, and a higher data volume transmission function such as bluetooth telephone or bluetooth music is quickly and efficiently started.
In general, the invention combines the working characteristics of the Bluetooth AOA technology, utilizes a transmitting terminal to simultaneously correspond to an array antenna receiving terminal, simplifies the complexity of the whole vehicle equipment process, can realize the synchronous switching of various wireless communication functions, and obviously improves the comprehensive performance of a vehicle-mounted communication system.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (10)
1. A multifunctional vehicle-mounted communication system based on a Bluetooth AOA mode is characterized by comprising a central processing unit, a Bluetooth transceiver, a radio frequency switch and an antenna module which are arranged on a vehicle body, wherein,
the Bluetooth transceiver is used for detecting whether adaptive Bluetooth mobile terminals exist around the Bluetooth transceiver, and if adaptive mobile terminal information is detected, the Bluetooth transceiver sends a wireless signal to the central processing unit;
the central processing unit is used for calculating the position of the mobile terminal according to the position of the Bluetooth transceiver and wireless signal data transmitted by the Bluetooth transceiver by combining a Bluetooth AOA technology, and judging whether the relative distance between the mobile terminal and the vehicle body meets an unlocking or locking preset value; if the unlocking preset value is met, informing a vehicle control unit to unlock, and controlling the Bluetooth transceiver to enter a Bluetooth entertainment mode; if the preset locking value is met, the vehicle control unit is informed to continue to lock, and the Bluetooth transceiver is controlled to keep a low-power Bluetooth mode;
the antenna device comprises two antenna groups, and the central processing unit controls the Bluetooth transceiver to be connected with the corresponding antenna group according to the judgment result of unlocking or locking, wherein the first antenna group corresponds to the low-power Bluetooth mode, and the second antenna group corresponds to the Bluetooth entertainment mode;
and the radio frequency switch is used for switching connection between the Bluetooth transceiver and different antenna groups.
2. The multifunctional vehicular communication system according to claim 1, wherein the first antenna group comprises more than three antenna units, and the antenna units are equally spaced from each other by a distance not exceeding one-half wavelength of the bluetooth operating band.
3. The multifunctional vehicular communication system according to claim 2, wherein the bluetooth transceiver detects the adapted mobile terminal information and then sends a control signal to control the rf switch to cyclically switch between the antenna units in the first antenna group in turn, so as to obtain a phase difference between the rf signals received by each of the antenna units and transmitted by the mobile terminal.
4. The multifunctional vehicular communication system according to claim 3, wherein each of the antenna units is electrically connected to the RF switch via a corresponding cable, and the length of each cable is equal.
5. The multifunctional vehicular communication system according to claim 4, wherein the RF switch is a single-pole multi-throw switch.
6. The multifunctional vehicular communication system according to claim 5, wherein the second antenna group comprises an antenna unit, when the relative distance between the mobile terminal and the vehicle body satisfies an unlocking preset value, the central processing unit controls the bluetooth transceiver to send out a designated control signal, and the radio frequency switch is connected to the second antenna group in a switching manner.
7. The multifunctional vehicular on-board communication system according to claim 6, wherein the first antenna set is disposed on a vehicle roof, the second antenna set is disposed at a central control position in the vehicle, and the central control unit is disposed in a vehicular central control system.
8. The multifunctional vehicular communication system according to any one of claims 1 to 7, wherein the mobile terminal has a bluetooth module, and the bluetooth module is used to make a communication connection with the bluetooth transceiver in advance.
9. The multifunctional vehicular communication system according to claim 8, wherein the mobile terminal is in the form of a mobile phone or a vehicle key with a bluetooth module.
10. A multifunctional vehicle-mounted communication method based on a Bluetooth AOA mode is characterized by comprising the following steps:
(1) the method comprises the following steps that a Bluetooth module of a mobile terminal is used for achieving communication connection with a Bluetooth transceiver configured on a vehicle body in advance;
(2) opening a Bluetooth module of a mobile terminal and approaching the detection range of a Bluetooth transceiver;
(3) the Bluetooth transceiver sends the detected adaptive signal to the central processing unit, and the central processing unit calculates the position of the mobile end according to the position of the Bluetooth transceiver and detection signal data transmitted by the Bluetooth transceiver by combining a Bluetooth AOA technology and judges whether the relative distance between the mobile end and the vehicle body meets an unlocking or locking preset value;
(3.1) if the unlocking preset value is met, the central processing unit informs the vehicle control unit to unlock, and controls the Bluetooth transceiver to enter a Bluetooth entertainment mode through switching of the radio frequency switch, so that the Bluetooth transceiver is used for transmitting high data volume such as Bluetooth telephone or Bluetooth music;
and (3.2) if the preset locking value is met, informing the vehicle control unit to continuously lock, controlling the Bluetooth transceiver to keep a low-power-consumption Bluetooth mode, and sensing the entry of the entity-free key into the system.
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| CN113993112A (en) * | 2021-10-28 | 2022-01-28 | 厦门理工学院 | Control management system of intelligent circuit breaker |
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| CN110676559A (en) * | 2018-07-03 | 2020-01-10 | 李尔公司 | Angle-of-arrival antenna assembly for passively entering passively-started base station |
| CN109466505A (en) * | 2018-09-18 | 2019-03-15 | 广东远峰汽车电子有限公司 | Vehicle key-free control system and method based on RSSI and AOA |
| CN110933647A (en) * | 2019-11-28 | 2020-03-27 | 长城汽车股份有限公司 | Vehicle-mounted Bluetooth control method and system and vehicle |
| CN111784876A (en) * | 2020-06-30 | 2020-10-16 | 成都四海万联智能电子设备有限公司 | Bluetooth digital key positioning system for acquiring reference point data containing azimuth angle |
| CN111873942A (en) * | 2020-07-24 | 2020-11-03 | 上海纳恩汽车技术有限公司 | Automobile door handle module based on UWB technology and implementation method |
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