CN114696061A - Vehicle key positioning method and terminal equipment - Google Patents
Vehicle key positioning method and terminal equipment Download PDFInfo
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- CN114696061A CN114696061A CN202011578773.XA CN202011578773A CN114696061A CN 114696061 A CN114696061 A CN 114696061A CN 202011578773 A CN202011578773 A CN 202011578773A CN 114696061 A CN114696061 A CN 114696061A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/125—Means for positioning
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/32—Adaptation for use in or on road or rail vehicles
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/3822—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving specially adapted for use in vehicles
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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
- H04W4/30—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]
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Abstract
The invention is suitable for the technical field of vehicle key positioning, and provides a vehicle key positioning method and terminal equipment, wherein the method comprises the following steps: controlling a first low-frequency antenna, a second low-frequency antenna and a third low-frequency antenna to emit a magnetic field outwards when the vehicle performs keyless entry or keyless start; acquiring the magnetic field intensity of the vehicle key obtained through induction; according to the magnetic field intensity, respectively calculating a first included angle between the magnetic field intensity corresponding to the first low-frequency antenna and the magnetic field intensity corresponding to the third low-frequency antenna, and a second included angle between the magnetic field intensity corresponding to the second low-frequency antenna and the magnetic field intensity corresponding to the third low-frequency antenna; when first contained angle and second contained angle all are greater than predetermineeing the contained angle, confirm the position of car key according to magnetic field intensity to can pinpoint the car key, and can prevent 1D relay attack, improve the security of vehicle, reduce the risk that the vehicle that leads to because car key location defect loses.
Description
Technical Field
The invention belongs to the technical field of vehicle key positioning, and particularly relates to a vehicle key positioning method and terminal equipment.
Background
As technology developed, vehicles became more highly deployed and some vehicle ignition systems were upgraded from the first knob-type ignition devices to one-button starting devices. A user can start the vehicle by directly pressing a start button and simultaneously stepping on a brake or a clutch without taking out the key after the vehicle enters the vehicle, the principle is that a magnetic field is emitted outwards through low-frequency antennas inside and outside the vehicle, the vehicle key senses the magnetic field, then the magnetic field intensity of the corresponding position is calculated and returned to the vehicle, and the specific position of the key can be determined through the magnetic field intensity of multiple antennas returned by the vehicle key.
However, since only one low-frequency antenna is operated at the same time and the strength of the magnetic field is returned by the vehicle key, when the vehicle key is far away from the vehicle, the low-frequency signal of the vehicle needs to be amplified to the magnetic field strength which can be identified by the vehicle key through an amplifier (1D relay attack device), and then the magnetic field strength is actively sent back by the vehicle key, and the relay attack can unlock and start the vehicle with a keyless entry system and/or a keyless start system in an unauthorized situation, so that the risk of vehicle loss is increased.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method for locating a vehicle key and a terminal device, which aim to solve the problem of risk of vehicle loss due to a vehicle key location defect in the prior art.
In order to achieve the above object, a first aspect of the embodiments of the present invention provides a method for positioning a vehicle key, where a first low-frequency antenna is disposed at a front left door position outside a vehicle, a second low-frequency antenna is disposed at a position corresponding to a front seat on a roof of the vehicle, and a third low-frequency antenna is disposed at a front right door position inside the vehicle, an included angle between the first low-frequency antenna and the second low-frequency antenna is greater than zero, and an included angle between the second low-frequency antenna and the third low-frequency antenna is greater than zero;
the method for positioning the vehicle key comprises the following steps:
when the vehicle performs keyless entry or keyless start, controlling the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna to emit a magnetic field outwards;
acquiring the magnetic field intensity of the vehicle key obtained through induction;
according to the magnetic field strength, respectively calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, and a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
and when the first included angle and the second included angle are both larger than a preset included angle, determining the position of the vehicle key according to the magnetic field intensity.
As another embodiment of the present application, the car key is provided with coils for sensing the magnetic field strength of the antenna in the directions of the xyz axes;
the method for acquiring the magnetic field intensity by the vehicle key comprises the following steps:
the car key passes through the coil response first low frequency antenna is respectively at the first magnetic field intensity of the three axle direction of xyz, the second low frequency antenna respectively at the second magnetic field intensity of the three axle direction of xyz and the third low frequency antenna is respectively at the third magnetic field intensity of the three axle direction of xyz, and receive through LF first magnetic field intensity the second magnetic field intensity with behind the third magnetic field intensity, give vehicle controller through the RF transmission.
As another embodiment of the present application, calculating a first included angle between a magnetic field strength corresponding to the first low-frequency antenna and a magnetic field strength corresponding to the third low-frequency antenna includes:
calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the first magnetic field strength and the second magnetic field strength;
calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, including:
and calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the second magnetic field strength and the third magnetic field strength.
As another embodiment of the present application, the calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the first magnetic field strength and the second magnetic field strength includes:
according to
Calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(1，2)Represents the first angle, (x)1，y1，z1) Representing the first magnetic field strength, (x)2，y2，z2) Representing the second magnetic field strength.
As another embodiment of the present application, the calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the second magnetic field strength and the third magnetic field strength meter includes:
according to
Calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(2，3)Represents said second angle, (x)3，y3，z3) Representing the third magnetic field strength.
As another embodiment of the present application, a fourth low-frequency antenna is disposed at a position corresponding to a rear seat on the roof of a vehicle, an included angle between the first low-frequency antenna and the fourth low-frequency antenna is greater than zero, and an included angle between the fourth low-frequency antenna and the third low-frequency antenna is greater than zero;
the method for positioning the vehicle key further comprises the following steps:
when the first included angle and the second included angle are not larger than the preset included angle, controlling the fourth low-frequency antenna to emit a magnetic field outwards;
acquiring fourth magnetic field intensity obtained by the vehicle key through induction;
calculating a third included angle between the first magnetic field strength and the fourth magnetic field strength according to the first magnetic field strength and the fourth magnetic field strength;
calculating a fourth included angle between the third magnetic field strength and the fourth magnetic field strength according to the third magnetic field strength and the fourth magnetic field strength;
and when the third included angle and the fourth included angle are both larger than the preset included angle, determining the position of the vehicle key according to the magnetic field intensity.
As another embodiment of this application, when third contained angle with the fourth contained angle all is not greater than when predetermineeing the contained angle, withdraw from car key location flow.
A second aspect of the embodiments of the present invention provides a vehicle key positioning device, where a first low-frequency antenna is disposed at a front left door position outside a vehicle, a second low-frequency antenna is disposed at a position corresponding to a front row of seats on a roof inside the vehicle, and a third low-frequency antenna is disposed at a front right door position, an included angle between the first low-frequency antenna and the second low-frequency antenna is greater than zero, and an included angle between the second low-frequency antenna and the third low-frequency antenna is greater than zero;
the device for positioning the car key comprises:
the control module is used for controlling the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna to emit magnetic fields outwards when the vehicle performs keyless entry or keyless starting;
the acquisition module is used for acquiring the magnetic field intensity obtained by the vehicle key through induction;
the calculation module is used for calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna and a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna respectively according to the magnetic field strengths;
and the positioning module is used for determining the position of the car key according to the magnetic field intensity when the first included angle and the second included angle are both larger than a preset included angle.
A third aspect of an embodiment of the present invention provides a terminal device, including: a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the method for locating a vehicle key according to any of the above embodiments when executing the computer program.
A fourth aspect of an embodiment of the present invention provides a computer-readable storage medium, including: the computer-readable storage medium stores a computer program which, when executed by a processor, implements the steps of the method for vehicle key location as described in any of the above embodiments.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: compared with the prior art, the low-frequency antennas for transmitting the magnetic field are arranged at different positions of the vehicle, so that the vehicle key can sense the magnetic field intensity in each direction in the space, the vehicle controller can accurately position the vehicle key according to the angle of the magnetic field intensity corresponding to different low-frequency antennas, 1D relay attack can be prevented, the safety of the vehicle is improved, and the risk of vehicle loss caused by the positioning defect of the vehicle key is reduced.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a schematic flow chart illustrating an implementation of a method for locating a vehicle key according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a vehicle with a low frequency antenna according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a hardware connection of a vehicle key provided by an embodiment of the invention;
FIG. 4 is an exemplary diagram of a method for vehicle key location provided by another embodiment of the present invention;
FIG. 5 is a schematic view of a vehicle key positioning device provided by an embodiment of the present invention;
fig. 6 is a schematic diagram of a terminal device according to an embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 1 is a schematic flow chart illustrating an implementation of a method for positioning a vehicle key according to an embodiment of the present invention, first describing a position of a low-frequency antenna disposed on a vehicle in a vehicle key positioning system according to the embodiment of the present invention, as shown in FIG. 2, the vehicle is provided with four low frequency antennas, a first low frequency antenna is arranged at the front left door outside the vehicle, a second low frequency antenna is arranged at the position corresponding to the front row seat on the roof inside the vehicle, a third low frequency antenna is arranged at the front right door, a fourth low frequency antenna is arranged at the position corresponding to the rear row seat on the roof inside the vehicle, and the included angle between the first low-frequency antenna and the second low-frequency antenna is greater than zero, the included angle between the second low-frequency antenna and the third low-frequency antenna is greater than zero, the included angle between the first low-frequency antenna and the fourth low-frequency antenna is greater than zero, and the included angle between the fourth low-frequency antenna and the third low-frequency antenna is greater than zero. That is, a certain angle needs to exist between the low-frequency antenna arranged inside the vehicle and the low-frequency antenna arranged outside the vehicle, and as shown in fig. 2, the low-frequency antenna arranged inside the vehicle and the low-frequency antenna arranged outside the vehicle are perpendicular to each other.
As shown in a hardware block diagram of the car key in fig. 3, a coil for sensing magnetic field strength of an antenna in an xyz three-axis direction is disposed on the car key, where the coil may be a 3D coil, a Low Frequency (LF) receiving module is connected to three axes of the 3D coil and configured to receive magnetic field strength sensed by the three axes, and a Micro Control Unit (MCU) is respectively connected to the LF receiving module and a Radio Frequency (RF) transmitting module, and in this embodiment, is configured to forward the magnetic field strength received by the LF to the RF transmitting module.
The method for positioning the vehicle key can comprise the following steps.
When the vehicle controller controls the low-frequency antenna to emit a magnetic field outwards, the vehicle key is in the range of the magnetic field, and the magnetic field can be sensed.
And 102, acquiring the magnetic field intensity of the vehicle key obtained through induction.
Optionally the car key passes through the coil response first low frequency antenna is respectively at the first magnetic field intensity of the three axle direction of xyz, the second low frequency antenna is respectively at the second magnetic field intensity of the three axle direction of xyz and the third low frequency antenna is respectively at the third magnetic field intensity of the three axle direction of xyz, and receive through LF first magnetic field intensity the second magnetic field intensity with behind the third magnetic field intensity, give vehicle controller through the RF transmission.
The first magnetic field strength can be noted as (x)1，y1，z1) The second magnetic field strength can be expressed as (x)2，y2，z2) The third magnetic field strength can be expressed as (x)3，y3，z3)。
Optionally, when the first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna is calculated in this step, the method may include:
and calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the first magnetic field strength and the second magnetic field strength.
Optionally, can be based on
Calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(1，2)Represents the first angle, (x)1，y1，z1) Representing the first magnetic field strength, (x)2，y2，z2) Representing the second magnetic field strength.
Optionally, when a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna is calculated in this step, the method may include:
and calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the second magnetic field strength and the third magnetic field strength.
Optionally, can be based on
Calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(2，3)Represents said second angle, (x)3，y3，z3) Representing the third magnetic field strength.
And 104, when the first included angle and the second included angle are both larger than a preset included angle, determining the position of the vehicle key according to the magnetic field intensity.
Optionally, the preset included angle may be set according to an actual situation, for example, the preset included angle may be calibrated in an auxiliary manner according to the 1D relay attack device, and a value of the preset included angle is not limited in this embodiment.
When alpha is(1，2)>Alpha and alpha(2，3)>Alpha, the magnetic field intensity sensed by the vehicle key is effective, at the moment, the vehicle controller can compare the first magnetic field intensity with a magnetic field intensity threshold value corresponding to a preset first low-frequency antenna, compare the second magnetic field intensity with a magnetic field intensity threshold value corresponding to a preset second low-frequency antenna, compare the third magnetic field intensity with a magnetic field intensity threshold value corresponding to a preset third low-frequency antenna, and obtain the specific position of the key according to the comparison result.
As shown in fig. 4, this step is followed by:
and 105, controlling the fourth low-frequency antenna to emit a magnetic field outwards when the first included angle and the second included angle are not larger than a preset included angle.
In this step, when the first included angle and the second included angle are not greater than the preset included angle, it indicates that the magnetic field strength sensed by the car key is invalid, and the car key can continue to emit a magnetic field through a fourth low-frequency antenna arranged on the vehicle, so that the car key senses the fourth magnetic field strength again.
And 106, acquiring a fourth magnetic field intensity obtained by the vehicle key through induction.
Optionally, the vehicle key induces the fourth low-frequency antenna through the coil to obtain a fourth magnetic field strength (x)4，y4，z4) And transmitting the fourth magnetic field intensity to a vehicle controller through RF after receiving the fourth magnetic field intensity through LF.
Optionally, according to
Calculating a third angle between the first magnetic field strength and the fourth magnetic field strength;
wherein alpha is(1，4)Representing said third angle.
And 108, calculating a fourth included angle between the third magnetic field strength and the fourth magnetic field strength according to the third magnetic field strength and the fourth magnetic field strength.
Optionally according to
Calculating a fourth angle between the third magnetic field strength and the fourth magnetic field strength;
wherein alpha is(3，4)Representing said fourth angle.
And step 109, when the third included angle and the fourth included angle are both larger than the preset included angle, determining the position of the vehicle key according to the magnetic field intensity.
Optionally, when third contained angle and fourth contained angle all are greater than when predetermineeing the contained angle, it is effectual to explain the magnetic field intensity that car key sensed, and vehicle controller can compare according to the magnetic field intensity threshold value that first magnetic field intensity and the first low frequency antenna of predetermineeing correspond, and second magnetic field intensity compares with the magnetic field intensity threshold value that second low frequency antenna of predetermineeing correspond and third magnetic field intensity compares with the magnetic field intensity threshold value that third low frequency antenna of predetermineeing correspond this moment, obtains the concrete position of key according to the comparison result.
Optionally, when the third included angle and the fourth included angle are not greater than the preset included angle, it is indicated that the magnetic field strength sensed by the car key is invalid, and the car key positioning process is exited.
According to the method for positioning the vehicle key, when the vehicle performs keyless entry or keyless starting, the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna are controlled to emit a magnetic field outwards; acquiring the magnetic field intensity of the vehicle key obtained through induction; according to the magnetic field strength, respectively calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, and a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna; and when the first included angle and the second included angle are both larger than a preset included angle, determining the position of the vehicle key according to the magnetic field intensity. The 3D coil that sets up in the vehicle key promptly, the magnetic field intensity of all directions in the perception place space, the special arrangement of the low frequency antenna that the car end is used for launching the magnetic field simultaneously to can accurate positioning vehicle key, and can prevent 1D relay attack, improve the security of vehicle, reduce the risk that the vehicle that leads to because vehicle key location defect loses.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
The method for positioning the vehicle key according to the above embodiment includes that a first low-frequency antenna is arranged at a front left vehicle door position outside the vehicle, a second low-frequency antenna is arranged at a position corresponding to a front row of seats on the roof of the vehicle inside the vehicle, a third low-frequency antenna is arranged at a front right vehicle door position, an included angle between the first low-frequency antenna and the second low-frequency antenna is greater than zero, and an included angle between the second low-frequency antenna and the third low-frequency antenna is greater than zero. Fig. 5 is a diagram illustrating an example of a vehicle key positioning device provided by an embodiment of the invention. As shown in fig. 5, the apparatus may include: a control module 501, an acquisition module 502, a calculation module 503, and a location module 504.
A control module 501, configured to control the first low-frequency antenna, the second low-frequency antenna, and the third low-frequency antenna to emit a magnetic field outwards when a vehicle performs keyless entry or keyless start;
an obtaining module 502, configured to obtain a magnetic field intensity obtained by sensing a vehicle key;
a calculating module 503, configured to calculate, according to the magnetic field strength, a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, and a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, respectively;
and the positioning module 504 is configured to determine the position of the car key according to the magnetic field strength when the first included angle and the second included angle are both greater than a preset included angle.
Optionally, the car key is provided with coils for sensing the magnetic field intensity of the antenna in the directions of the xyz axes;
the car key obtains during magnetic field intensity, the car key passes through the coil response first low frequency antenna is respectively at the first magnetic field intensity of the three axle direction of xyz, the second low frequency antenna respectively at the second magnetic field intensity of the three axle direction of xyz and the third low frequency antenna is respectively at the third magnetic field intensity of the three axle direction of xyz, and receive through LF first magnetic field intensity second magnetic field intensity with behind the third magnetic field intensity, give vehicle controller through the RF transmission.
Optionally, when the calculating module 503 calculates a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, the calculating module may be configured to:
calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the first magnetic field strength and the second magnetic field strength;
optionally, when the calculating module 503 calculates a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, the calculating module may be configured to:
and calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the second magnetic field strength and the third magnetic field strength.
Optionally, the calculating module 503 is configured to:
according to
Calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(1，2)Represents the first angle, (x)1，y1，z1) Representing the first magnetic field strength, (x)2，y2，z2) Representing the second magnetic field strength.
Optionally, the calculating module 503 is configured to:
according to
Calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(2，3)Represents said second angle, (x)3，y3，z3) Representing the third magnetic field strength.
Optionally, a fourth low-frequency antenna is arranged at a position corresponding to a rear seat on the roof of the vehicle, the included angle between the first low-frequency antenna and the fourth low-frequency antenna is greater than zero, and the included angle between the fourth low-frequency antenna and the third low-frequency antenna is greater than zero.
Optionally, the control module 501 is further configured to control the fourth low-frequency antenna to emit a magnetic field outwards when the first included angle and the second included angle are not greater than a preset included angle;
the obtaining module 502 is further configured to obtain a fourth magnetic field strength obtained by the vehicle key through induction;
the calculating module 503 is further configured to calculate a third included angle between the first magnetic field strength and the fourth magnetic field strength according to the first magnetic field strength and the fourth magnetic field strength;
the calculating module 503 is further configured to calculate a fourth included angle between the third magnetic field strength and the fourth magnetic field strength according to the third magnetic field strength and the fourth magnetic field strength;
the positioning module 504 is further configured to determine the position of the car key according to the magnetic field strength when the third included angle and the fourth included angle are both greater than the preset included angle.
Optionally, when the third included angle and the fourth included angle are not greater than the preset included angle, the vehicle key positioning process is exited.
According to the device for positioning the vehicle key, when the vehicle performs keyless entry or keyless starting, the control module controls the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna to emit a magnetic field outwards; the acquisition module acquires the magnetic field intensity obtained by the vehicle key through induction; according to the magnetic field strength, a calculation module respectively calculates a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna and a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna; when the first included angle and the second included angle are larger than the preset included angle, the positioning module determines the position of the car key according to the magnetic field intensity. The 3D coil that sets up in the vehicle key promptly, the magnetic field intensity of all directions in the perception place space, the special arrangement of the low frequency antenna that the car end is used for launching the magnetic field simultaneously to can accurate positioning vehicle key, and can prevent 1D relay attack, improve the security of vehicle, reduce the risk that the vehicle that leads to because vehicle key location defect loses.
Fig. 6 is a schematic diagram of a terminal device according to an embodiment of the present invention. As shown in fig. 6, the terminal device 600 of this embodiment includes: a processor 601, a memory 602 and a computer program 603 stored in said memory 602 and executable on said processor 601, such as a program for car key location. The processor 601 executes the computer program 603 to implement the steps in the above-mentioned method embodiment of vehicle key positioning, such as the steps 101 to 104 shown in fig. 1 or the steps shown in fig. 4, and the processor 601 executes the computer program 603 to implement the functions of the modules in the above-mentioned device embodiments, such as the functions of the modules 501 to 504 shown in fig. 5.
Illustratively, the computer program 603 may be partitioned into one or more program modules, which are stored in the memory 602 and executed by the processor 601 to implement the present invention. The one or more program modules may be a series of computer program instruction segments capable of performing specific functions for describing the execution of the computer program 603 in the device or terminal 600 for vehicle key location. For example, the computer program 603 may be divided into a control module 501, an obtaining module 502, a calculating module 503 and a positioning module 504, and specific functions of the modules are shown in fig. 5, which are not described in detail herein.
The terminal device 600 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 601, a memory 602. Those skilled in the art will appreciate that fig. 6 is merely an example of a terminal device 600 and does not constitute a limitation of terminal device 600 and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the terminal device may also include input-output devices, network access devices, buses, etc.
The Processor 601 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 602 may be an internal storage unit of the terminal device 600, such as a hard disk or a memory of the terminal device 600. The memory 602 may also be an external storage device of the terminal device 600, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 600. Further, the memory 602 may also include both an internal storage unit and an external storage device of the terminal device 600. The memory 602 is used for storing the computer programs and other programs and data required by the terminal device 600. The memory 602 may also be used to temporarily store data that has been output or is to be output.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus/terminal device and method may be implemented in other ways. For example, the above-described embodiments of the apparatus/terminal device are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method according to the embodiments of the present invention may also be implemented by a computer program, which may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the method embodiments may be implemented. . Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, usb disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution medium, and the like. It should be noted that the computer readable medium may contain content that is subject to appropriate increase or decrease as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, computer readable media does not include electrical carrier signals and telecommunications signals as is required by legislation and patent practice.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. A method for positioning a vehicle key is characterized in that a first low-frequency antenna is arranged at the position of a front left vehicle door outside a vehicle, a second low-frequency antenna is arranged at the position corresponding to a front row of vehicle seats on the top of the vehicle inside the vehicle, a third low-frequency antenna is arranged at the position of a front right vehicle door, the included angle between the first low-frequency antenna and the second low-frequency antenna is greater than zero, and the included angle between the second low-frequency antenna and the third low-frequency antenna is greater than zero;
the vehicle key positioning method comprises the following steps:
when the vehicle performs keyless entry or keyless start, controlling the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna to emit a magnetic field outwards;
acquiring the magnetic field intensity of the vehicle key obtained by induction;
according to the magnetic field strength, respectively calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, and a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
and when the first included angle and the second included angle are both larger than a preset included angle, determining the position of the vehicle key according to the magnetic field intensity.
2. The method for locating a vehicle key according to claim 1, wherein the vehicle key is provided with coils for sensing the magnetic field strength of the antenna in directions of three xyz axes;
the method for acquiring the magnetic field intensity by the vehicle key comprises the following steps:
the car key passes through the coil response first low frequency antenna respectively in the first magnetic field intensity of the three axle direction of xyz the second low frequency antenna respectively in the second magnetic field intensity of the three axle direction of xyz and the third low frequency antenna is respectively in the third magnetic field intensity of the three axle direction of xyz, and receive through LF first magnetic field intensity second magnetic field intensity with behind the third magnetic field intensity, give vehicle controller through the RF transmission.
3. The method of claim 2, wherein calculating a first angle between the magnetic field strength corresponding to the first low frequency antenna and the magnetic field strength corresponding to the third low frequency antenna comprises:
calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the first magnetic field strength and the second magnetic field strength;
calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna, including:
and calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna according to the second magnetic field strength and the third magnetic field strength.
4. The method of claim 3, wherein calculating a first angle between a magnetic field strength corresponding to the first low frequency antenna and a magnetic field strength corresponding to the third low frequency antenna based on the first magnetic field strength and the second magnetic field strength comprises:
according to
Calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(1，2)Represents the first angle, (x)1，y1，z1) Representing the first magnetic field strength, (x)2，y2，z2) Representing the second magnetic field strength.
5. The method of claim 4, wherein calculating a second angle between the magnetic field strength of the second low-frequency antenna and the magnetic field strength of the third low-frequency antenna based on the second magnetic field strength and the third magnetic field strength meter comprises:
according to
Calculating a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna;
wherein alpha is(2，3)Represents said second angle, (x)3，y3，z3) RepresentThe third magnetic field strength.
6. The method for locating vehicle keys according to any one of claims 2-5, wherein a fourth low-frequency antenna is arranged in a position corresponding to a rear seat on the roof of the vehicle, and the included angle between the first low-frequency antenna and the fourth low-frequency antenna is greater than zero degree, and the included angle between the fourth low-frequency antenna and the third low-frequency antenna is greater than zero degree;
the method for positioning the vehicle key further comprises the following steps:
when the first included angle and the second included angle are not larger than the preset included angle, controlling the fourth low-frequency antenna to emit a magnetic field outwards;
acquiring fourth magnetic field intensity obtained by the vehicle key through induction;
calculating a third included angle between the first magnetic field strength and the fourth magnetic field strength according to the first magnetic field strength and the fourth magnetic field strength;
calculating a fourth included angle between the third magnetic field strength and the fourth magnetic field strength according to the third magnetic field strength and the fourth magnetic field strength;
and when the third included angle and the fourth included angle are both larger than the preset included angle, determining the position of the vehicle key according to the magnetic field intensity.
7. The method of vehicle key location of claim 6,
and when the third included angle and the fourth included angle are not larger than the preset included angle, the vehicle key positioning process is withdrawn.
8. A device for positioning a car key is characterized in that a first low-frequency antenna is arranged at the position of a front left car door outside a car, a second low-frequency antenna is arranged at the position corresponding to a front row of seats on the top of the car in the car, a third low-frequency antenna is arranged at the position of a front right car door, the included angle between the first low-frequency antenna and the second low-frequency antenna is greater than zero, and the included angle between the second low-frequency antenna and the third low-frequency antenna is greater than zero;
the device for positioning the car key comprises:
the control module is used for controlling the first low-frequency antenna, the second low-frequency antenna and the third low-frequency antenna to emit magnetic fields outwards when the vehicle performs keyless entry or keyless starting;
the acquisition module is used for acquiring the magnetic field intensity obtained by the vehicle key through induction;
the calculation module is used for calculating a first included angle between the magnetic field strength corresponding to the first low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna and a second included angle between the magnetic field strength corresponding to the second low-frequency antenna and the magnetic field strength corresponding to the third low-frequency antenna respectively according to the magnetic field strengths;
and the positioning module is used for determining the position of the car key according to the magnetic field intensity when the first included angle and the second included angle are both larger than a preset included angle.
9. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011578773.XA CN114696061A (en) | 2020-12-28 | 2020-12-28 | Vehicle key positioning method and terminal equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011578773.XA CN114696061A (en) | 2020-12-28 | 2020-12-28 | Vehicle key positioning method and terminal equipment |
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| CN114696061A true CN114696061A (en) | 2022-07-01 |
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