CN114650109A - Method and system for detecting direction of entering vehicle and vehicle - Google Patents
Method and system for detecting direction of entering vehicle and vehicle Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
- G01S3/14—Systems for determining direction or deviation from predetermined direction
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/02—Power saving arrangements
- H04W52/0209—Power saving arrangements in terminal devices
- H04W52/0261—Power saving arrangements in terminal devices managing power supply demand, e.g. depending on battery level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a method, a system and a vehicle for identifying the direction of entering the vehicle, comprising the following steps: sequentially acquiring first signal strength of signals received by an antenna corresponding to each vehicle door; screening out the maximum value and the secondary maximum value in the first signal intensity; and when the difference value between the maximum value and the secondary maximum value exceeds a judgment threshold value, judging the direction of the antenna corresponding to the maximum value as the direction of entering the vehicle. The direction of entering the vehicle can be judged only by one node by utilizing the method, the arrangement quantity of the nodes can be greatly reduced, the manufacturing cost is saved, the antenna only receives signals, the power consumption is low, and meanwhile, the static power consumption can be reduced only by supplying power to one node.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a method and a system for detecting a direction of entering a vehicle and the vehicle.
Background
At present, a keyless entry/start system for an automobile generally adopts a multi-node arrangement mode of one master and multiple slaves, that is, a slave node is arranged on each automobile door, and a master node is arranged in the automobile, wherein the node refers to an active electronic device which can be connected to a network, and can transmit, receive or forward information through a communication channel. And each slave node acquires the distance from the slave node to the user and sends the distance to the master node, and the master node judges the direction of the user entering the vehicle through distance comparison. The inventor finds that in the process of implementing the application, a multi-node arrangement mode of one master and multiple slaves needs to arrange multiple nodes, and the cost is high.
Disclosure of Invention
In view of the above, the present application provides a method and a system for detecting a direction of entering a vehicle, and a vehicle, so as to solve the above technical problems.
The application provides a method for identifying a direction of entering a vehicle, which comprises the following steps: sequentially acquiring first signal strength of signals received by an antenna corresponding to each vehicle door; screening out the maximum value and the secondary maximum value in the first signal intensity; and when the difference value between the maximum value and the secondary maximum value exceeds a judgment threshold value, judging the direction of the antenna corresponding to the maximum value as the direction of entering the vehicle. This application only needs a node can judge and get into the vehicle direction, and the quantity of arranging of the node that can significantly reduce practices thrift manufacturing cost, and the antenna only receives signal moreover, and the low power dissipation simultaneously, only needs to supply power to a node, also can reduce static consumption.
Optionally, sequentially acquiring the first signal strength of the signal received by the antenna corresponding to each vehicle door includes: acquiring second signal strength of signals received by the antenna corresponding to each vehicle door for multiple times; calculating the average signal intensity of the signals received by each antenna according to the second signal intensities acquired for multiple times; and taking the average signal strength as a first signal strength. By calculating the average signal strength, the accuracy of the first signal strength can be increased, improving the accuracy of the recognition of the direction of the incoming vehicle.
Optionally, when a difference between the maximum value and the secondary maximum value exceeds a determination threshold value, determining a direction in which an antenna corresponding to the maximum value is located as a direction of entering the vehicle, and then further including: monitoring the distance between the user and the vehicle by using the antenna corresponding to the maximum value; when the distance is smaller than the preset distance, opening the vehicle door corresponding to the antenna corresponding to the maximum value; and when the situation that a user enters the vehicle or the vehicle is started is monitored, the antenna corresponding to the maximum value stops working, and the antenna corresponding to the door of the main cab is started. When the vehicle is flamed out, the antenna on one side of the door of the main cab can directly enter the locking distance judging process, so that the vehicle is conveniently locked.
Optionally, screening out the maximum value and the second maximum value in the first signal strength further includes: the signal received by each antenna is amplified and noise reduced to improve the signal-to-noise ratio of the signal output.
Optionally, amplifying and denoising the signal received by each antenna, the method further includes: obtaining a noise coefficient NFn and a gain Gn of each component, wherein n is more than or equal to 2; according to the formula
The total noise figure NFsys is calculated. By calculating the total noise figure, the noise figure of the system can be evaluated for better reception of the signal.
The application also provides a vehicle entering direction identification system, which comprises a plurality of antennas, a communication module and a main control processor; the plurality of antennas are respectively arranged on one side where the main cab door is arranged and one side where the auxiliary cab door is arranged; the antennas are used for receiving signals and sending the signals to the main control processor through the communication module; the main control processor is used for controlling the antenna to sequentially receive signals, receiving the signals sent by the antenna, acquiring first signal strength of the signals, and screening out the maximum value and the secondary maximum value in the first signal strength; and when the difference value between the maximum value and the secondary maximum value exceeds a judgment threshold value, judging the direction of the antenna corresponding to the maximum value as the direction of entering the vehicle. This application only needs a node can judge and get into the vehicle direction, and the quantity of arranging of the node that can significantly reduce practices thrift manufacturing cost, and the antenna only received signal moreover, and the low power dissipation simultaneously, only need supply power to a node, also can reduce static consumption.
Optionally, the system further comprises a radio frequency switch, an antenna is also installed on one side of the tail gate, each antenna is connected with the communication module through the radio frequency switch, and the main control processor controls the plurality of antennas to receive signals in sequence by controlling the radio frequency switch, so that the antennas can be controlled conveniently.
Optionally, the radio frequency switch further comprises a low noise amplifier in one-to-one correspondence with the antenna, and the antenna is connected with the radio frequency switch sequentially through the low noise amplifier and the coaxial cable so as to improve the signal-to-noise ratio of the signal output.
Optionally, the communication module is a vehicle-mounted bluetooth module or a vehicle-mounted UWB module, the antenna is a directional antenna, so that the structure can be simplified, the power consumption can be reduced, and the difference between the maximum value and the secondary maximum value can be increased, so that the direction of entering the vehicle can be better judged, and the judgment accuracy can be improved.
The present application further provides a vehicle comprising an incoming vehicle direction identification system as described above. This application only needs a node can judge and get into the vehicle direction, and the quantity of arranging of the node that can significantly reduce practices thrift manufacturing cost, and the antenna only receives signal moreover, and the low power dissipation simultaneously, only needs to supply power to a node, also can reduce static consumption.
The method, the system and the vehicle for identifying the direction of the entering vehicle receive signals in a time division multiplexing mode, the first signal strength of the signals is sequentially obtained, the difference value of the maximum value and the sub-maximum value of the first signal strength is compared with the judgment threshold value to judge the direction of the entering vehicle, the direction of the entering vehicle can be judged by only one node, the arrangement number of the nodes can be greatly reduced, the manufacturing cost is saved, an antenna only receives the signals, the power consumption is low, meanwhile, only one node needs to be powered on, and the static power consumption can be reduced.
Drawings
Fig. 1 is a flowchart of an incoming vehicle direction identification method of the present application.
Fig. 2 is a schematic view of the installation of the antenna of the present application.
Fig. 3 is a schematic configuration diagram of the entering vehicle direction recognition system of the present application.
Detailed Description
The technical solutions of the present application are described in detail below with reference to the accompanying drawings and specific embodiments. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Fig. 1 shows a flowchart of an entering vehicle direction identifying method of the present application, and as shown in fig. 1, the entering vehicle direction identifying method provided by the present application includes:
s100, sequentially acquiring first signal strength of signals received by antennas corresponding to each vehicle door;
as shown in fig. 2, an antenna 1 is provided on the side where the main cab door is located, on the side where the sub-cab door is located, and on the side where the tailgate is located.
The signals can be received in sequence by adopting the main cab door, the auxiliary cab door and the tail gate, and the first signal intensity is obtained.
S200, screening out the maximum value and the secondary maximum value in the first signal intensity;
and sorting the first signal intensity from large to small, and screening out a maximum value and a secondary maximum value. The second maximum is only smaller than the maximum and larger than all other values.
And S300, when the difference value between the maximum value and the secondary maximum value exceeds a judgment threshold value, judging the direction of the antenna corresponding to the maximum value as the direction of entering the vehicle.
For example, the first signal strength of the signal received by the antenna on the side where the main cab door is located is the maximum value, the maximum value is-60 dBm, the secondary maximum value is-70 dBm, the difference value is 10dBm, the judgment threshold value is 5dBm, and if 10 > 5, the side of the main cab door is considered as the entering direction of the vehicle.
The method for identifying the direction of the vehicle entering receives the signal in a time division multiplexing mode, the first signal strength of the signal is sequentially obtained, the difference value between the maximum value and the second maximum value of the first signal strength is compared with the judgment threshold value to judge the direction of the vehicle entering, the direction of the vehicle entering can be judged only by one node, the number of the nodes can be greatly reduced, the manufacturing cost is saved, the antenna only receives the signal, the power consumption is low, meanwhile, only one node needs to be powered on, and the static power consumption can be reduced.
In addition, if the method of measuring the flight time is adopted to identify the direction of entering the vehicle, each node needs to send a signal to a user once, receive the signal twice, perform information interaction at least three times, and have high power consumption. And the antenna 1 is only needed to receive signals, so that the power consumption can be greatly reduced.
Further, S100, sequentially obtaining the first signal strength of the signal received by the antenna corresponding to each vehicle door includes:
s110, sequentially obtaining second signal strength of signals received by the antenna corresponding to each vehicle door for multiple times;
that is, step S100 is repeated a plurality of times to obtain a plurality of second signal strengths. In this embodiment, it may be repeated 10 times.
S120, calculating the average signal intensity of the signals received by each antenna according to the second signal intensities acquired for multiple times;
an arithmetic average is obtained as an average signal strength from the second signal strengths of the signals received by each antenna 1 a plurality of times.
And S130, taking the average signal intensity as a first signal intensity.
By calculating the average signal strength, the accuracy of the first signal strength can be increased, improving the accuracy of the recognition of the direction of the incoming vehicle.
In one embodiment, S300, when the difference between the maximum value and the secondary maximum value exceeds a determination threshold, determining that the direction of the antenna corresponding to the maximum value is the direction of entering the vehicle, and then further includes:
s310, monitoring the distance between the user and the vehicle by using the antenna corresponding to the maximum value;
for example, when a user enters the vehicle from the passenger compartment door side, only the antenna 1 on the passenger compartment door side is opened to monitor the distance between the user and the vehicle.
S320, when the distance is smaller than the preset distance, opening the vehicle door corresponding to the antenna corresponding to the maximum value;
for example, if the distance is 20cm and the predetermined distance is 30cm, the passenger compartment door is opened.
S330, when it is monitored that a user enters the vehicle or the vehicle is started, the antenna corresponding to the maximum value stops working, and the antenna corresponding to the door of the main cab is started.
When a user enters the vehicle or the vehicle starts, the antenna 1 on the door side of the passenger compartment stops operating, and the antenna 1 on the door side of the main compartment starts operating. When the vehicle is flamed out, the antenna 1 on one side of the door of the main cab can directly enter the locking distance judgment process, so that the vehicle is conveniently locked. And locking the vehicle when the distance between the user and the vehicle is greater than the set distance.
Further, S200, the screening of the maximum value and the second maximum value in the first signal strength further includes: the signal received by each antenna is amplified and noise reduced to improve the signal-to-noise ratio of the signal output.
As shown in fig. 3, the present application also provides an entering vehicle direction recognition system, which includes a plurality of antennas 1, a communication module 4 and a main control processor 5;
as shown in fig. 2, a plurality of antennas 1 are respectively mounted on the side where the main cab door is located and the side where the sub-cab door is located.
The antennas 1 are all used for receiving signals and sending the signals to the main control processor through the communication module 4.
The main control processor 5 is used for controlling the antenna 1 to sequentially receive signals, receiving the signals sent by the antenna 1, acquiring first signal strength of the signals, and screening out a maximum value and a secondary maximum value in the first signal strength; and when the difference value between the maximum value and the secondary maximum value exceeds a judgment threshold value, judging the direction of the antenna corresponding to the maximum value as the direction of entering the vehicle.
The application provides an entering vehicle direction identification system is through adopting the mode received signal of time division multiplex to acquire the first signal strength of signal in proper order, compare the difference of the maximum value of first signal strength and time maximum value with judge the threshold value and judge and get into the vehicle direction, only need a node can judge and get into the vehicle direction, the quantity of arranging of the node that can significantly reduce practices thrift manufacturing cost, and the antenna is received signal only, low power dissipation, and simultaneously, only need to supply power to a node, also can reduce static consumption.
Furthermore, the system for identifying the direction of the entering vehicle also comprises a radio frequency switch 3, an antenna 1 is also arranged on one side of the tail gate, each antenna 1 is connected with a communication module 4 through the radio frequency switch 3,
the main control processor 5 is connected with a control port of the radio frequency switch 3, and sequentially controls the plurality of antennas 1 to receive signals by controlling the radio frequency switch 3.
By providing the radio frequency switch 3, the control of each antenna 1 can be facilitated.
As shown in fig. 3, the default connection mode of the rf switch 3 is: is connected to the antenna 1 on the side of the main cab door.
When a user enters the vehicle or starts the vehicle or locks the vehicle, the radio frequency switch 3 is reset to the default state, namely: is connected to the antenna 1 on the side of the main cab door.
The insertion loss is typically around 0.5dB, since the rf switch 3 introduces additional insertion loss. In addition, the distance from the radio frequency switch 3 to each antenna 1 is about 2m, the insertion loss of the length of coaxial cable 6 is about 3.5dB, and therefore, the insertion loss of the whole link is about 4 dB. Since the insertion loss of the passive device can be considered as a noise coefficient, the noise coefficient introduced by the coaxial cable 6 and the radio frequency switch 3 in the link is about 4 dB.
In order to compensate the increase of the noise coefficient and improve the receiving sensitivity, a low noise amplifier 2 is added between an antenna 1 and a radio frequency switch 3. The low noise amplifiers 2 correspond to the antennas 1 one to one. The antenna 1 is connected with the radio frequency switch 3 through the low noise amplifier 2 and the coaxial cable 6 in sequence.
Through setting up low noise amplifier 2, not only can improve the SNR of signal, but also the influence of coaxial cable length to total noise figure that still can significantly reduce can make the node lay in the optional position of vehicle.
In a specific embodiment, the amplifying and the noise reducing are performed on the signals received by each antenna, and the method further comprises the following steps:
obtaining a noise coefficient NFn and a gain Gn of each component, wherein n is more than or equal to 2;
as shown in fig. 2-3, the noise figure and gain of the low noise amplifier 2, the coaxial cable 6, and the rf switch 3 are obtained. Wherein, the noise coefficient of the low noise amplifier 2 is 0.5dB, the gain is 20dB, the noise coefficient of the coaxial cable 6 is 3.5dB, the gain is 0, the noise coefficient of the radio frequency switch 3 is 0.5dB, the gain is 0.
According to the formula
The total noise figure NFsys is calculated.
Calculated from the above data, NFsys is 0.55 dB.
By calculating the total noise figure, the noise figure of the system can be evaluated for better reception of the signal.
In a specific embodiment, the communication module 4 may adopt a vehicle-mounted bluetooth module or a vehicle-mounted UWB (Ultra Wide Band) module to simplify the structure and reduce power consumption.
Further, the antenna 1 is a directional antenna, and the difference between the maximum value and the secondary maximum value can be increased, so that the entering direction of the vehicle can be judged better.
In the present embodiment, the antenna 1 may be a linearly polarized directional antenna, with a general lobe angle of 120 degrees and a gain of about 5-10 dBi, such as a patch antenna.
The selection of the judgment threshold value is an important precondition for accurately judging the entering direction of the key carrier, and the installation position of the antenna 1, the type of the antenna and the like can influence the selection of the judgment threshold value.
According to Friis's transmission law, the received signal strength Pr at the free space distance Dr position can be calculated by equation (1):
wherein, Pt is the intensity of the transmitting power, Gt is the gain of the transmitting antenna, Gr is the gain of the receiving antenna, and lambda is the wavelength of the wireless signal.
Taking the two antennas 1 located at the side where the main and auxiliary cab doors are located in fig. 2 as an example, assuming that the key is located at the side where the main cab door is located, the difference between the signal strengths respectively received at the positions of the two antennas 1 can be obtained according to equation (1):
dr2 has a relationship to Dr 1:
Dr2＝Dr1+W (3)
where W is the spacing between the two antennas 1.
Therefore, equation (3) can be simplified as:
the greater Δ pr (db), the easier it is to distinguish the difference in signal strength between the received signals on the two antennas 1, so that, when installed, the distance between the two antennas 1 should be as large as possible so that the distance between them is as large as possible
The larger the item.
However, it is possible to use a single-layer,
will decrease as the required judgment distance increases: for example, in an automatic parking scene, it is required to determine whether the key carrier is on the main cab door side or the sub-cab door side when the key carrier is located 6m away from the vehicle body. W is the general width of the car body 2 m. At this time, the process of the present invention,
only about 2dB difference can be provided and the direction of entry into the vehicle is not easily determined.
With directional antennas, the difference between Gr1 and Gr2 may be at least about 10 dB. Therefore, by means of the characteristics of the directional antenna, a sufficiently large Δ pr (db) can still be obtained at a long judgment distance, which is beneficial to setting a proper judgment threshold value.
The present application further provides a vehicle comprising an incoming vehicle direction identification system as described above.
The utility model provides a vehicle is through adopting time division multiplex's mode received signal to acquire the first signal strength of signal in proper order, compare the difference of the maximum value of first signal strength and time maximum value with the judgement threshold value and judge and get into the vehicle direction, only need a node can judge and get into the vehicle direction, the quantity of arranging of the node that can significantly reduce practices thrift manufacturing cost, and the antenna only received signal moreover, and the low power dissipation, simultaneously, only need to supply power to a node, also can reduce static consumption.
The technical solutions of the present application are described in detail with reference to specific embodiments, which are used to help understand the ideas of the present application. The derivation and modification made by the person skilled in the art on the basis of the specific embodiment of the present application also belong to the protection scope of the present application.
Claims (10)
1. An entering-vehicle direction identifying method, characterized by comprising:
sequentially acquiring first signal strength of signals received by an antenna corresponding to each vehicle door;
screening out the maximum value and the secondary maximum value in the first signal intensity;
and when the difference value between the maximum value and the secondary maximum value exceeds a judgment threshold value, judging the direction of the antenna corresponding to the maximum value as the direction of entering the vehicle.
2. The entering-vehicle direction identifying method according to claim 1, wherein sequentially acquiring the first signal strength of the signal received by the antenna corresponding to each vehicle door comprises:
acquiring second signal strength of signals received by the antenna corresponding to each vehicle door for multiple times;
calculating the average signal intensity of the signals received by each antenna according to the second signal intensities acquired for multiple times;
and taking the average signal strength as a first signal strength.
3. The entering-vehicle direction identifying method according to claim 1, wherein when a difference between the maximum value and the secondary maximum value exceeds a determination threshold value, a direction in which an antenna corresponding to the maximum value is located is determined as a entering-vehicle direction, and thereafter further comprising:
monitoring the distance between the user and the vehicle by using the antenna corresponding to the maximum value;
when the distance is smaller than the preset distance, opening the vehicle door corresponding to the antenna corresponding to the maximum value;
and when the situation that the user enters the vehicle or the vehicle is started is monitored, the antenna corresponding to the maximum value stops working, and the antenna corresponding to the door of the main cab is started.
4. A method of identifying a direction of an entering vehicle as claimed in any one of claims 1 to 3, screening out maxima and sub-maxima in the first signal strength, and further comprising:
the signal received by each antenna is amplified and noise reduced.
5. A method of identifying a direction of entry into a vehicle as claimed in claim 4 wherein the signals received by each antenna are amplified and de-noised, further comprising:
obtaining a noise coefficient NFn and a gain Gn of each component, wherein n is more than or equal to 2;
according to the formula
The total noise figure NFsys is calculated.
6. The system for identifying the direction of entering the vehicle is characterized by comprising a plurality of antennas, a communication module and a main control processor;
the plurality of antennas are respectively arranged on one side where the main cab door is arranged and one side where the auxiliary cab door is arranged;
the antennas are used for receiving signals and sending the signals to the main control processor through the communication module;
the main control processor is used for controlling the antenna to sequentially receive signals, receiving the signals sent by the antenna, acquiring first signal strength of the signals, and screening out the maximum value and the secondary maximum value in the first signal strength; and when the difference value between the maximum value and the secondary maximum value exceeds a judgment threshold value, judging the direction of the antenna corresponding to the maximum value as the direction of entering the vehicle.
7. An incoming vehicle direction recognition system as claimed in claim 6, further comprising a radio frequency switch, wherein an antenna is also mounted on a side of the tailgate, each antenna is connected to the communication module through the radio frequency switch, and the master processor sequentially controls the plurality of antennas to receive signals by controlling the radio frequency switch.
8. The entering vehicle direction recognition system of claim 7, further comprising a low noise amplifier in one-to-one correspondence with the antenna, the antenna being connected to the radio frequency switch sequentially through the low noise amplifier and the coaxial cable.
9. The entering-vehicle direction recognition system of claim 8, wherein the communication module is a vehicle-mounted bluetooth module or a vehicle-mounted UWB module, and the antenna is a directional antenna.
10. A vehicle characterized by comprising an incoming vehicle direction recognition system as claimed in any one of claims 6 to 9.
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