CN109859352A - A kind of automobile key based on NB-IoT network - Google Patents
A kind of automobile key based on NB-IoT network Download PDFInfo
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- CN109859352A CN109859352A CN201811496019.4A CN201811496019A CN109859352A CN 109859352 A CN109859352 A CN 109859352A CN 201811496019 A CN201811496019 A CN 201811496019A CN 109859352 A CN109859352 A CN 109859352A
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- 238000001228 spectrum Methods 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims abstract description 12
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- 230000008569 process Effects 0.000 claims description 10
- 238000012512 characterization method Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- 230000003595 spectral effect Effects 0.000 claims 1
- 230000000875 corresponding effect Effects 0.000 description 12
- 230000009466 transformation Effects 0.000 description 6
- 231100000572 poisoning Toxicity 0.000 description 5
- 230000000607 poisoning effect Effects 0.000 description 5
- 238000005457 optimization Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- 241000287196 Asthenes Species 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 208000002173 dizziness Diseases 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012802 pre-warming Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- 238000012706 support-vector machine Methods 0.000 description 1
Abstract
The present invention provides a kind of automobile keys based on NB-IoT network, it mainly include shell, battery module, micro-control unit and display screen, the automobile key includes NB-IoT module, and NB-IoT module positions to obtain own location information by radio spectrum intensity fingerprint image；A long-range car service key is additionally provided on the shell, when persistently pressing the key, automobile key then continues through NB-IoT module and sends own location information to automobile.Automobile key of the invention can obtain own location information, realize remote coded communication.
Description
Technical field
The present invention relates to a kind of automobile key, specifically a kind of automobile key based on NB-IoT network.
Background technique
Automobile key has been the necessary condition of automobile starting at this stage, most of to issue faintness wave by automobile key,
The electric wave signal is received by car antenna, through electronic control unit identification signal code；Or using nothings such as ZigBee or bluetooths
Line radio-frequency technique is opened and locks door.But the effective distance of these technologies is short, can not start vehicle at a distance, lead to Summer and winter,
Car owner can not first pass through starting vehicle in advance and then open air-conditioning system, or carry out engine prewarming.
Currently, with the fast development of advanced DAS (Driver Assistant System) and automatic Pilot technology, original short distance communication vehicle
Key is no longer satisfied the demand of people.When needing vehicle to go on a journey, vehicle can be driven the urgent hope of user automatically
It sails to designated place.Therefore, the car key for having telecommunication becomes research hotspot.Here " remote " distance, Jin Jinqu
Not in the bluetooth car key of the communication distance 10m of current main-stream or so, can reach hundreds of meters or even several kilometers.
Existing key is wanted to realize long-range car service function, needs to solve the problems, such as first three following:
1. existing automobile key control effective distance is closer, can not remote control；
2. automobile key encounters signal interference, loss of data, malice infiltration when with receiver carried by automobile and controller communication
Deng；
3. car key does not have when user wishes to call automatic driving to required place at remote (3-5km)
It is standby that the ability of self poisoning information is provided.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind can telecommunication be capable of providing itself
The automobile key based on NB-IoT network of location information.
To achieve the above object, the present invention adopts the following technical scheme: a kind of automobile key based on NB-IoT network, main
It to include shell, battery module, micro-control unit and display screen, which is characterized in that the automobile key includes NB-IoT mould
Block, NB-IoT module position to obtain own location information by radio spectrum intensity fingerprint image；
A long-range car service key is additionally provided on the shell, when persistently pressing the key, automobile key then continues through NB-
IoT module sends own location information to automobile.
Preferably, steps are as follows for the automobile key acquisition own location information:
(1) radio spectrum intensity fingerprint image is established according to the node with GPS function in base station, has in the foundation area of coverage
The received signal strength characterization information (Received Signal Strength Indicator, RSSI) of the node of GPS function,
Main plot domain is divided into several sub-regions by base station, and each subregion includes that cluster has the node of GPS function and its corresponding
RSSI characteristic is classified as some the most similar subregion then according to the RSSI information of the automobile key of collection；
(2) principle that point-to- point communication is carried out between the node using ordinary node and with GPS function passes through estimation
The distance between ordinary node and the node with GPS function in region, it is accurate to estimate automobile key and common section in subregion
The distance between point is carried out a method of distance estimations as RSSI function using regression process algorithm, is reduced and built with this
Found the cost of entire radio spectrum intensity fingerprint image.
Preferably, at least have three NB-IoT nodes with GPS function in the step (2) in subregion.
Preferably, the regression process in the step (2) for doing discrete attributes, and then generates one continuously
Function output, to obtain giving the distance estimations solution of any RSSI value；Given each node L with GPS function apart
RSSI sampled value corresponding to a different distance, the mathematical modeling of regression process are as follows:
The d of formula (1)lIt is at a distance of the corresponding distance in first of base station position.Spectrum intensity expression formula is inserted for convenience
Value, selection uses polynomial regression, ψ (RSSI herel) polynomial regression expression formula are as follows:
The a of formula (2)j, j=0,1,2 ..., n are corresponding polynomial coefficients, once obtain ψ (RSSIl), obtain one newly
Spectrum intensity measured value RSSIm, so that it may learn its corresponding distance are as follows:
Preferably, the node is the access device that network always supports NB-IoT agreement, including automobile key and automobile.
Preferably, plain-text instructions are encrypted using AES256 Encryption Algorithm between the node.
Beneficial effects of the present invention:
1. the present invention uses NB-IoT module, communication distance can achieve 3-5km, have low in energy consumption, and network capacity is big, clothes
The features such as quality of being engaged in is high, high safety, and adapt to the diversity of network application.
2. the present invention obtains own location information by radio-frequency fingerprint network positions using NB-IoT module, subsequent progress is more
High-precision regression optimization can be used for realizing long-range car service function to accurately obtain the location information of automobile key.
3. the present invention is encrypted communication data using AES256 Encryption Algorithm at automobile key end, effectively protect
The safety and integrality of communication data between automobile key and automobile.
Detailed description of the invention
Fig. 1 is a kind of automobile key system hardware catenation principle figure based on NB-IoT network of the present invention；
Fig. 2 is a kind of automobile key Shell model figure based on NB-IoT network of the present invention；
Fig. 3 provides self poisoning information principle figure for a kind of automobile key based on NB-IoT network of the present invention.
Specific embodiment
The present invention provides a kind of automobile key based on NB-IoT network, to make the purpose of the present invention, technical solution and effect
Fruit is clearer, clear, and the present invention is described in more detail as follows in conjunction with drawings and embodiments.It should be appreciated that this place
Specific examples are only used to explain the present invention for description, is not intended to limit the present invention.
A kind of automobile key system hardware catenation principle figure based on NB-IoT network as shown in Figure 1, system hardware packet
Include power supply processing module, MCU minimum system, TFT-LCD display screen, NB-IoT module and key.MCU minimum system, including MCU
Chip, RAM chip and eeprom chip；The NB-IoT module is attached by metal-oxide-semiconductor and GPIO mouthfuls and MCU, described
After GPIO mouthfuls can be set to off-state, NB-IoT module enters dormant state, reduces power consumption to the greatest extent.
On the MCU minimum system of automobile key, AES256 Encryption Algorithm has been run.The AES256 Encryption Algorithm, specifically
Refer to the symmetric encipherment algorithm (Advanced Encryption Standard, AES) for using 256 bit length keys, in cryptography
The inside is also known as Rijndael Encryption Algorithm.The key that AES256 Encryption Algorithm is specified user by cipher key spreading method
It is expanded into a linear array, then passes through the transformation of S box, row transformation, rank transformation and the behaviour for carrying out exclusive or with expanded keys
Make completion data encryption.It is similar, MCU computing unit is likewise supplied on the car body matched with car key, by transformation of driving in the wrong direction,
Data deciphering is completed in inverse S box transformation and the operation of inverse rank transformation, obtains the plaintext control instruction that car key is sent.
The NB-IoT module is connected by metal-oxide-semiconductor, GPIO with MCU, close when needing to send by NB-IoT module
When literary data, MCU activates NB-IoT module by GPIO, and carries out broadcast transmission to car body.
Power management module has USB type-c interface, and has power management chip, realizes the charging function to battery
Energy.
TFT-LCD display screen is used to show the information such as current vehicle door status, state of charge or oil mass state, current time.
A kind of automobile key Shell model figure based on NB-IoT network as shown in Figure 2, the automobile key shell are equipped with
One car service key " CALL ", the Continued depression key then send positioning instruction to MCU.
A kind of automobile key based on NB-IoT network provides self poisoning information principle figure, this system institute as shown in Figure 3
The fundamental being related to is as follows:
Base station: being responsible for the access dispatch deal of a large amount of long range IoT equipment, and usual one big IoT network passes through several
Base station can cover entire city, and base station completes the processing of various information by connection data processing centre, such as in the present invention
The positioning of key.
Node: the access device of network support NB-IoT agreement, as the present invention in key and automobile be all node.
GPS node: it other than the basic demand for meeting node, is additionally configured with GPS recipient and determines self poisoning information
And location information can be sent to other nodes.
NB-IoT agreement supports transmission at a distance, and the signal bandwidth that agreement itself is supported only has 180kHz, can be with base
Positioning function is completed in RSSI or arrival time.But in order to improve positioning accuracy, the present invention completes vehicle using following scheme
The positioning of key:
Radio-frequency fingerprint network is established according to the node with GPS function in base station, i.e., base station is according to the GPS receiver in the area of coverage
RSSI information main plot domain is divided into several sub-regions, each subregion includes the extremely corresponding RSSI of cluster GPS node
Characteristic is classified as some the most similar subregion then according to the RSSI information of the car key of collection.
To indicate that the other label of sub-district, n indicate the label of base station, a GPS node in moment t subregion is surveyed from base station
The RSSI of amount is expressed asThen the radio-frequency fingerprint data of a GPS node can be expressed as follows:
1 radio spectrum finger print data table of table
If there is L GPS node in the subregion, can collect latitude is L × N × T data volume, and classification is asked
Topic is wanted to work as and provides L × T sample, and each sample has N number of attribute.The problem is not a linear classification problem,
Nonlinear SVM (Support Vector Machine, SVM) can be the effective ways for solving the problems, such as such.SVM passes through introducing
The mechanism of kernel function is mapped as the linear separability problem of high latitude attribute space in the low inseparable problem of latitude attribute space originally, often
Kernel function is into Gaussian kernel as follows:
SVM learns the decision function of each class by error in classification most lowerization, brings the x in formula respectively into when training
The RSSI attribute value of training data.Subregion classification where key in order to obtain brings the RSSI numerical value of key into each determine
Plan function, the corresponding category regions of the highest decision function of value are the subregion where key.
Because radio-frequency fingerprint information has consequence, including optimization mobile phone user's attachment in Modern Communication System design
It is likely to after building a station in optimal base station, therefore required for the calculating process of the first step using GPS node finger print information
It is set up and offline storage is got off, do not need temporarily to collect when carrying out the sub-zone dividing of car key, the key of subregion is fixed
Position not necessarily meets required precision, carries out the regression optimization of higher precision in second step in subregion thus.
It is logical that the GPS node of positioning system can carry out point-to-point with the node (such as described car key node) for not having GPS
News, this feature can be used to the distance between accurate estimation ordinary node, by estimation ordinary node and periphery GPS node it
Between distance.In order to improve positioning accuracy, at least have three GPS nodes in each described class, at the same time, in order to drop
The low cost for establishing entire radio spectrum intensity fingerprint image, used here as regression process as RSSI function a method into
Row distance estimation.The regression process for doing discrete attributes, and then generates a continuous function output, thus
To the distance estimations solution for giving any RSSI value.RSSI sampling corresponding to given each L different distance of GPS node apart
Value, the mathematical modeling of regression process are as follows:
The d of formula (1)lIt is at a distance of the corresponding distance in first of base station position.Spectrum intensity expression formula is inserted for convenience
Value, selection uses polynomial regression here.ψ(RSSIl) polynomial regression expression formula are as follows:
The a of formula (2)j, j=0,1,2 ..., n are corresponding polynomial coefficients.Once obtaining ψ (RSSIl), obtain one newly
Spectrum intensity measured value RSSIm, so that it may learn its corresponding distance are as follows:
By algorithm above, automobile key can be obtained self poisoning information, then by pressing car service key, by itself
Location information by way of point-to-point communication or base station forward by way of be sent to autonomous driving vehicle, this
It can continuous interactive refreshing location information between period key and base station, key and automobile.In order to guarantee car key and vehicle body it
Between communication security, phase is used by software realization AES256 Encryption Algorithm, automobile key and vehicle body on MCU minimum system
Same key, car key end run Encryption Algorithm, plain-text instructions are encrypted；Body end runs decipherment algorithm, will receive
Wireless data be decrypted by decipherment algorithm, and control body of a motor car make corresponding actions response.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.Any label in claim should not be construed as limiting the claims involved.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (6)
- It mainly include shell, battery module, micro-control unit and display screen 1. a kind of automobile key based on NB-IoT network, It is characterized in that, the automobile key includes NB-IoT module, NB-IoT module is positioned by radio spectrum intensity fingerprint image To obtain own location information；A long-range car service key is additionally provided on the shell, when persistently pressing the key, automobile key then continues through NB-IoT Module sends own location information to automobile.
- 2. a kind of automobile key based on NB-IoT network according to claim 1, which is characterized in that the automobile key Obtaining own location information, steps are as follows:(1) radio spectrum intensity fingerprint image is established according to the node with GPS function in base station, interior with GPS function according to the area of coverage The node received signal strength characterization information of energy, i.e. main plot domain is divided into several sub-regions, every height by RSSI information, base station Region includes node and its corresponding RSSI characteristic of the cluster with GPS function, then according to the RSSI of the automobile key of collection Information is classified as some the most similar subregion；(2) principle that point-to- point communication is carried out between the node using ordinary node and with GPS function, by estimating subregion The distance between interior ordinary node and the node with GPS function, it is accurate estimate in subregion automobile key and ordinary node it Between distance, using regression process algorithm as RSSI function carry out distance estimations a method, reduced with this establish it is whole The cost of a radio spectrum intensity fingerprint image.
- 3. a kind of automobile key based on NB-IoT network according to claim 2, which is characterized in that the step (2) At least have three NB-IoT nodes with GPS function in middle subregion.
- 4. a kind of automobile key based on NB-IoT network according to claim 2, which is characterized in that the step (2) In regression process, for doing discrete attributes, and then generate a continuous function output, thus obtain it is given arbitrarily The distance estimations solution of RSSI value；RSSI sampling corresponding to given each L different distance of node with GPS function apart Value, the mathematical modeling of regression process are as follows:The d of formula (1)lIt is at a distance of the corresponding distance in first of base station position.For convenience to spectrum intensity expression formula interpolation, here Selection uses polynomial regression, ψ (RSSIl) polynomial regression expression formula are as follows:The a of formula (2)j, j=0,1,2 ..., n are corresponding polynomial coefficients, once obtain ψ (RSSIl), obtain a new frequency Spectral intensity measured value RSSIm, so that it may learn its corresponding distance are as follows:。
- 5. a kind of automobile key based on NB-IoT network according to claim 2, which is characterized in that the node is branch Hold the network access equipment of NB-IoT agreement, including automobile key and automobile.
- 6. a kind of automobile key based on NB-IoT network according to claim 2, which is characterized in that bright between the node Text instruction is encrypted using AES256 Encryption Algorithm.
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Cited By (1)
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| CN114019943A (en) * | 2021-11-05 | 2022-02-08 | 浙江吉利控股集团有限公司 | Energy consumption control method and system for automobile key |
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