CN106297318A - A kind of magnetic detection system at a distance based on radio spread spectrum communication - Google Patents
A kind of magnetic detection system at a distance based on radio spread spectrum communication Download PDFInfo
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- CN106297318A CN106297318A CN201610908728.3A CN201610908728A CN106297318A CN 106297318 A CN106297318 A CN 106297318A CN 201610908728 A CN201610908728 A CN 201610908728A CN 106297318 A CN106297318 A CN 106297318A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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Abstract
The invention discloses a kind of magnetic detection system at a distance based on radio spread spectrum communication, including power management module, CPU control unit, geomagnetism detecting module, real-time clock module and radio spread spectrum communication module；Described power management module is connected to CPU control unit, geomagnetism detecting module and the equal communication of real-time clock module are connected to CPU control unit, geomagnetism detecting module is used for Scanning Detction geomagnetic data, and CPU control unit is waken up up when significant change occurs in geomagnetic data, the geomagnetic data that simultaneously will appear from significant change is sent to CPU control unit, and real-time clock module sends real time clock data when significant change occurs in geomagnetic data to CPU control unit；Described CPU control unit connects radio spread spectrum communication module, and CPU control unit is connected to receive gateway by radio spread spectrum communication module wireless telecommunications.The present invention improves the accuracy of detection, improves the communication distance of detection node and data gateway, and saves the energy.
Description
Technical field
The present invention relates to vehicle geomagnetism detecting technical field, a kind of remote earth magnetism based on radio spread spectrum communication
Detecting system.
Background technology
At present, the mode of vehicle detection mainly has Coil technique, video technique, microwave radar technology, also has magnetic strength technology.
Coil technique is to be embedded under road surface with metal ring coil, utilizes vehicle through coil region because of vehicle body iron material
The change of the inductance value that material is caused is to detect the existence of vehicle.Shortcoming is I&M since it is desired that suspend traffic, destroy
Road surface and become the most complicated, add that the factors such as vehicle weight cause the life-span the longest, thus maintenance cost be the highest.With traffic light
Control system is compatible very well, but poor with the compatibility of traffic information acquisition system based on other technology.The most conventional
The transmission of coil transport information detecting system information use repeating query, and system based on other technology mainly uses master
The dynamic mode reported.
Video technique is to use computer video detection transport information, by video frequency pick-up head and computer mould apery
The function of eye, delimit virtual coil in range of video, and vehicle enters detection region makes background gray scale change, thus perception
The existence of vehicle. these Detection Techniques can measuring car speed, vehicle flowrate, the basic transport information parameter such as occupation rate, it can be difficult to realize very
Multilane detects simultaneously.I&M is made to become the most complicated since it is desired that forward is installed on L-type crossbeam.And technology is not
It is the most ripe, needs to overcome the impact of external condition.
Microwave radar technology is to utilize radar antenna to launch electromagnetic wave, when having vehicle through out-of-date, then can wave reflection be returned
Coming, then received and calculate process by radar detector, different tracks cause echo-signal owing to its target reflection distance is different
Difference, it is thus possible to detect the information of many parking stalls simultaneously.Shortcoming is that power consumption is too high, invests of a relatively high, is not suitable for
Magnetic strength technology is that the ferromagnetic material contained based on vehicle itself can produce shadow to the Geomagnetic signal of vehicle domain of the existence
Ring, make the geomagnetic chart linesofforce of vehicle domain of the existence bend.When vehicle is through sensor proximity, and sensor can sensitive perception
To the change of signal, can be obtained by detecting the relevant information of target through signal analysis.Shortcoming is in the case of long term stop,
Geomagnetic data is highly susceptible to interference and causes data inaccurate.
For current vehicle detection means, all come with some shortcomings, but use the method for multiple detection can be the biggest
Improve detection accuracy, make up the deficiency of single detection.
Wiresounding method, needs existing parking lot is changed wiring of then constructing on a large scale, and cost is higher.
The technology of WSN day by day maturation also allows vehicle testing techniques is more intelligent, convenient, miniaturization, for earth magnetism vehicle detection sensing with pass
Defeated solution " last one kilometer " has played important framework.Frequency range 433.05-434.79MHz and 2.4-2.5GHz belong to domestic
Exempting from ISM (industry, science and the medical science) open frequency range of license, using these frequency ranges is to need not the radio control Shen to local
Please authorize, therefore the two section frequency range is widely used.International and national is for wireless geomagnetism parking space detector at present
Low-speed wireless sensing network main You Liang great camp, be Zigbee wireless sense network based on 2.4GHz and based on FSK respectively
The 433MHz radio sensing network of sensing mode.Wireless vehicle detection receiver receptor (gateway) sends to wireless geomagnetism vehicle
Information, then upload to control centre by wireless or Ethernet.In the range of radio detection receptor can receive communication distance
The signal of wireless vehicle detector.
Carry out parking stall measure based on Zigbee wireless sensor network, the scheme of this realization be existing Zigbee without
Carry out secondary development on line sensor network foundation, add AMR magnetoresistive transducer and then carry out the detection of the vehicle on parking position.
Method based on ZigBee-network is then a kind of wireless method, than wired method convenient and flexible installation, but ZigBee
Work 2.4GHz frequency range, this frequency range overlaps with WIFI, bluetooth etc., the most crowded, be particularly susceptible to WIFI interference or
Being to interfere with WiFi user, and 2.4GHz is because wavelength is shorter, diffracting power is inadequate, and penetrance is not strong, in parking lot so
Communication quality susceptible in the middle of more complicated indoor environment.Major part engineering uses and all adds relaying to increase communication distance, but
Which increase cost and the difficulty of construction of whole engineering, also reduce the robustness of whole parking vehicle detection wireless network.
For Parking Stall detecting system, geomagnetism detecting device installation environment is special, and 2.4GHZ signal is because of its diffraction energy
Power is the poorest, and decay is relatively big, so 433MHz is more suitable for the application of wireless geomagnetism vehicle detection.433MHz is longer than 2.4GHz wavelength,
Penetrance is higher, is more suitable for more complicated outdoor environment.433MHz based on FSK is wirelessly transferred, and does not the most all have steady
Fixed Networking protocol, is used mostly now transparent transmission mode networking, causes bigger frequencies wastes, make whole networking capability significantly
Reduce.Whole networking mode does not takes into account that the utilization rate of room and time, sacrifices power consumption and ensures the transmission of data.It addition, based on
Although the distance that the wireless sense network communication distance of the 433MHz of FSK is than 2.4GHz is far, but still can not meet reality
Application.
Summary of the invention
It is an object of the invention to provide a kind of magnetic detection system at a distance based on radio spread spectrum communication, on solving
State the problem proposed in background technology.
For achieving the above object, the present invention provides following technical scheme:
A kind of magnetic detection system at a distance based on radio spread spectrum communication, controls single including power management module, CPU
Unit, geomagnetism detecting module, real-time clock module and radio spread spectrum communication module；Described power management module is connected to
CPU control unit, and power management module is used for carrying out CPU control unit, geomagnetism detecting module, real-time clock module
And the electric energy management and control between radio spread spectrum communication module；Described geomagnetism detecting module and the equal communication of real-time clock module are even
Being connected to CPU control unit, geomagnetism detecting module is used for Scanning Detction geomagnetic data, and calls out when significant change occurs in geomagnetic data
Awake CPU control unit, the geomagnetic data that simultaneously will appear from significant change is sent to CPU control unit；Described high-precision real is constantly
Clock module is for sending real time clock data when significant change occurs in geomagnetic data to CPU control unit, and high-precision real is constantly
Clock module and geomagnetism detecting module one_to_one corresponding；Described CPU control unit connects radio spread spectrum communication module, and CPU controls single
Unit is connected to receive gateway by radio spread spectrum communication module wireless telecommunications, and the geomagnetic data obtained is carried out by CPU control unit
Process and obtain parking space state data, and parking space state data are sent to radio spread spectrum communication module, radio spread spectrum communication module
It is uploaded to the parking space state data of acquisition receive gateway.
As the further scheme of the present invention: described geomagnetism detecting module is arranged in parking stall, and geomagnetism detecting module with
Parking stall one_to_one corresponding.
As the present invention further scheme: be embedded with vehicle detecting algorithm module and event in described geomagnetism detecting module
Barrier self-recovery module.
As the present invention further scheme: the rate of scanning of described geomagnetism detecting module is 10-100Hz.
As the present invention further scheme: the real time clock data of described real-time clock module is accurate to milli
Second；Described real-time clock Module-embedding is arranged in geomagnetism detecting module.
As the present invention further scheme: described radio spread spectrum communication module includes LORA spread spectrum chip, LORA expands
Frequently built-in chip type has a wireless communication protocol module, and wireless communication protocol module by parking space state data with the multiple loads set
Ripple carries out being wirelessly transmitted to receive gateway.
As the present invention further scheme: be also built-in with RSSI value detection module on described LORA spread spectrum chip,
The RSSI value being wirelessly transferred between radio spread spectrum communication module and reception gateway is detected by RSSI value detection module, and will obtain
The RSSI value taken is sent to CPU control unit.
As the present invention further scheme: the method for work of described power management module, step is as follows:
1) geomagnetism detecting module is in normal scan state, and real-time clock module is in normal time status, CPU
Control unit and radio spread spectrum communication module are in sleep state；
2) whether the geomagnetic data of geomagnetism detecting module there is significant change, the most then carry out step 3), otherwise return step
Rapid 1)；
3) power management module wakes up CPU control unit up, and geomagnetic data is processed by CPU control unit, it is judged that parking stall
Whether there is vehicles while passing situation, the most then carry out step 4), otherwise, return step 1)；
4) CPU control unit wake on wireless spread spectrum communication module, and CPU control unit passes through radio spread spectrum communication module will
Parking space state data send to receiving gateway, return step 1).
As the present invention further scheme: described real-time clock module is by CPU control unit and wireless
Spread spectrum communication module is connected to receive timing between gateway, and real-time clock module and reception gateway and is calibrated behaviour
Make.
As the present invention further scheme: during the school of described real-time clock module, frequency is 30-60min/
Secondary.
Compared with prior art, the invention has the beneficial effects as follows:
1, the present invention is during vehicle detection, by geomagnetism detecting technology and Wireless microwave technology with the use of, by double
Re-detection, improves the accuracy of detection, practical；
2, the present invention uses radio spread spectrum communication module, and the LORA spread spectrum chip of its radio spread spectrum communication module is built-in with base
In the wireless communication protocol module of Technology of Wireless Spread Spectrum low rate, be greatly improved the communication of detection node and data gateway away from
From；
3, the present invention is by arranging power management module, and power management module carries out CPU control unit, geomagnetism detecting mould
Electric energy management and control between block, real-time clock module and radio spread spectrum communication module, saves the energy, reaches energy-conserving and environment-protective
Purpose.
Accompanying drawing explanation
Fig. 1 is that the structure of magnetic detection system at a distance based on radio spread spectrum communication is not intended to.
Detailed description of the invention
Below in conjunction with detailed description of the invention, technical scheme is described in more detail.
Refer to Fig. 1, a kind of magnetic detection system at a distance based on radio spread spectrum communication, including power management module,
CPU control unit, geomagnetism detecting module, real-time clock module and radio spread spectrum communication module；Described power management mould
Block is connected to CPU control unit, and when power management module is used for carrying out CPU control unit, geomagnetism detecting module, high-precision real
Electric energy management and control between clock module and radio spread spectrum communication module；Described geomagnetism detecting module and real-time clock module
All communications are connected to CPU control unit, and described geomagnetism detecting module is arranged in parking stall, and geomagnetism detecting module is with parking stall one by one
Correspondence, geomagnetism detecting module is used for Scanning Detction geomagnetic data, and wake up CPU control up when significant change occurs in geomagnetic data single
Unit, the geomagnetic data that simultaneously will appear from significant change is sent to CPU control unit, described geomagnetism detecting module is embedded with vehicle
Detection algorithm and fault self-recovery module, vehicle detecting algorithm module is it can be avoided that interference between adjacent parking stall, fault
Self-recovery module is capable of the fault self-recovering function of geomagnetism detecting module, and the rate of scanning of described geomagnetism detecting module is
10-100Hz；
Described real-time clock module is real for sending to CPU control unit when significant change occurs in geomagnetic data
Time clock data, the real time clock data of real-time clock module is accurate to millisecond, real-time clock module and ground
Magnetic testi module one_to_one corresponding, in the present embodiment, it is preferred that described real-time clock Module-embedding is arranged on geomagnetism detecting
In module, in dynamic traffic, the time accurately have a strong impact on its test result, the present invention is by embedding for real-time clock module
Enter in each geomagnetism detecting module, thus avoid other time error, such as network delay, host process time delay etc., with
It is accompanied by the most real time to whole system；
Described CPU control unit connects radio spread spectrum communication module, and CPU control unit is by radio spread spectrum communication module
Wireless telecommunications are connected to receive gateway, and CPU control unit carries out processing acquisition parking space state data to the geomagnetic data obtained, and
Sending parking space state data to radio spread spectrum communication module, the parking space state data of acquisition are uploaded by radio spread spectrum communication module
To receiving gateway, described radio spread spectrum communication module includes that LORA spread spectrum chip, LORA spread spectrum chip are built-in with radio communication association
Discuss module, and parking space state data are carried out being wirelessly transmitted to receive net with the multiple carrier waves set by wireless communication protocol module
Close, be arranged such that and just have separate channel to have interference, also whole being wirelessly transferred will not be caused too much influence；
Also being built-in with RSSI value detection module on described LORA spread spectrum chip, RSSI value detection module is to radio spread spectrum communication
The RSSI value being wirelessly transferred between module and reception gateway detects, and the RSSI value of acquisition is sent to CPU control unit,
When there being vehicle to sail into, wireless signal transmission will be deteriorated, and when vehicle leaves, wireless signal transmission will improve, and utilize this phenomenon,
CPU control unit is by according to the RSSI value auxiliary judgment parking space state obtained.
The method of work of described power management module, step is as follows:
1) geomagnetism detecting module is in normal scan state, and real-time clock module is in normal time status, CPU
Control unit and radio spread spectrum communication module are in sleep state；
2) whether the geomagnetic data of geomagnetism detecting module there is significant change, the most then carry out step 3), otherwise return step
Rapid 1)；
3) power management module wakes up CPU control unit up, and geomagnetic data is processed by CPU control unit, it is judged that parking stall
Whether there is vehicles while passing situation, the most then carry out step 4), otherwise, return step 1)；
4) CPU control unit wake on wireless spread spectrum communication module, and CPU control unit passes through radio spread spectrum communication module will
Parking space state data send to receiving gateway, return step 1).
Described real-time clock module is connected to receive net by CPU control unit and radio spread spectrum communication module
Close, and between real-time clock module and reception gateway, timing is calibrated operation, to ensure real-time clock mould
The accuracy of block time, in the present embodiment, it is preferred that during the school of described real-time clock module, frequency is 30-60min/
Secondary.
The operation principle of the present invention is: described magnetic detection system, power management at a distance of based on radio spread spectrum communication
Module is used for carrying out between CPU control unit, geomagnetism detecting module, real-time clock module and radio spread spectrum communication module
Electric energy management and control.In normal state, geomagnetism detecting module is in normal scan state, and real-time clock module is just in
Often time status, CPU control unit and radio spread spectrum communication module be in sleep state, and geomagnetism detecting module is used for scanning inspection
Geodetic magnetic data, and CPU control unit is waken up up when significant change occurs in geomagnetic data, will appear from the earth magnetism of significant change simultaneously
Data are sent to CPU control unit, and CPU control unit carries out processing acquisition parking space state data to the geomagnetic data obtained, and
Judge whether parking stall exists vehicles while passing situation, if it is present CPU control unit wake on wireless spread spectrum communication module, and will
Parking space state data send to radio spread spectrum communication module, and the parking space state data of acquisition are uploaded to by radio spread spectrum communication module
Receiving gateway, after uploading, CPU control unit and radio spread spectrum communication module are all recovered to sleep state.It addition, RSSI value
The RSSI value being wirelessly transferred between radio spread spectrum communication module and reception gateway is detected by detection module, and by acquisition
RSSI value is sent to CPU control unit, and when there being vehicle to sail into, wireless signal transmission will be deteriorated, and when vehicle leaves, be wirelessly transferred
Signal will improve, and utilize this phenomenon, and CPU control unit is by according to the RSSI value auxiliary judgment parking space state obtained.
The present invention during vehicle detection, by geomagnetism detecting technology and Wireless microwave technology with the use of, by dual
Detection, improves the accuracy of detection, practical；The present invention uses radio spread spectrum communication module, its radio spread spectrum communication mould
The LORA spread spectrum chip of block is built-in with wireless communication protocol module based on Technology of Wireless Spread Spectrum low rate, and inspection is greatly improved
Survey the communication distance of node and data gateway；The present invention is by arranging power management module, and power management module carries out CPU control
Electric energy management and control between unit, geomagnetism detecting module, real-time clock module and radio spread spectrum communication module, saves energy
Source, reaches the purpose of energy-conserving and environment-protective.
Above the better embodiment of the present invention is explained in detail, but the present invention is not limited to above-mentioned embodiment party
Formula, in the ken that one skilled in the relevant art is possessed, it is also possible on the premise of without departing from present inventive concept
Various changes can be made.
Claims (10)
1. a magnetic detection system at a distance based on radio spread spectrum communication, it is characterised in that include power management module,
CPU control unit, geomagnetism detecting module, real-time clock module and radio spread spectrum communication module；Described power management mould
Block is connected to CPU control unit, and when power management module is used for carrying out CPU control unit, geomagnetism detecting module, high-precision real
Electric energy management and control between clock module and radio spread spectrum communication module；Described geomagnetism detecting module and real-time clock module
All communications are connected to CPU control unit, and geomagnetism detecting module is used for Scanning Detction geomagnetic data, and occurs substantially at geomagnetic data
Waking up CPU control unit during change up, the geomagnetic data that simultaneously will appear from significant change is sent to CPU control unit；Described high-precision
Degree real-time clock module is for sending real time clock data when significant change occurs in geomagnetic data to CPU control unit, high-precision
Degree real-time clock module and geomagnetism detecting module one_to_one corresponding；Described CPU control unit connects radio spread spectrum communication module, and
CPU control unit is connected to receive gateway by radio spread spectrum communication module wireless telecommunications, the CPU control unit earth magnetism to obtaining
Data carry out processing acquisition parking space state data, and send parking space state data to radio spread spectrum communication module, wireless frequency expansion
The parking space state data of acquisition are uploaded to receive gateway by communication module.
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 1, it is characterised in that described
Geomagnetism detecting module is arranged in parking stall, and geomagnetism detecting module and parking stall one_to_one corresponding.
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 2, it is characterised in that described
Vehicle detecting algorithm module and fault self-recovery module it is embedded with in geomagnetism detecting module.
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 3, it is characterised in that described
The rate of scanning of geomagnetism detecting module is 10-100Hz.
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 4, it is characterised in that described
The real time clock data of real-time clock module is accurate to millisecond；Described real-time clock Module-embedding is arranged on ground
In Magnetic testi module.
6. according to the magnetic detection system at a distance based on radio spread spectrum communication described in claim 1 or 2 or 3 or 4 or 5, its
Being characterised by, described radio spread spectrum communication module includes that LORA spread spectrum chip, LORA spread spectrum chip are built-in with wireless communication protocol
Module, and parking space state data carry out being wirelessly transmitted to receiving net by wireless communication protocol module with the multiple carrier waves set
Close.
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 6, it is characterised in that described
Also being built-in with RSSI value detection module on LORA spread spectrum chip, RSSI value detection module is to radio spread spectrum communication module and reception net
The RSSI value being wirelessly transferred between pass detects, and the RSSI value of acquisition is sent to CPU control unit.
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 7, it is characterised in that described
The method of work of power management module, step is as follows:
1) geomagnetism detecting module is in normal scan state, and real-time clock module is in normal time status, and CPU controls
Unit and radio spread spectrum communication module are in sleep state；
2) whether the geomagnetic data of geomagnetism detecting module there is significant change, the most then carry out step 3), otherwise return step
1)；
3) power management module wakes up CPU control unit up, and geomagnetic data is processed by CPU control unit, it is judged that whether parking stall
There is vehicles while passing situation, the most then carry out step 4), otherwise, return step 1)；
4) CPU control unit wake on wireless spread spectrum communication module, and CPU control unit passes through radio spread spectrum communication module by parking stall
Status data sends to receiving gateway, returns step 1).
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 8, it is characterised in that described
Real-time clock module is connected to receive gateway, and high-precision real by CPU control unit and radio spread spectrum communication module
Time clock module and receive timing between gateway and be calibrated operation.
Magnetic detection system at a distance based on radio spread spectrum communication the most according to claim 9, it is characterised in that institute
When stating the school of real-time clock module, frequency is 30-60min/ time.
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| CN107707359B (en) * | 2017-11-09 | 2021-07-06 | 上海众人网络安全技术有限公司 | Method and device for checking electronic cipher device |
| CN109979225A (en) * | 2017-12-28 | 2019-07-05 | 珠海华大智慧科技有限公司 | A kind of parking position detector and parking position detection system |
| CN108093379A (en) * | 2018-02-01 | 2018-05-29 | 深圳市泰比特科技有限公司 | A kind of train door monitor terminal and its system based on LoRa |
| CN108093379B (en) * | 2018-02-01 | 2024-01-26 | 深圳市泰比特科技有限公司 | Train door monitoring terminal based on loRa and train door monitoring system based on loRa |
| WO2020042833A1 (en) * | 2018-08-28 | 2020-03-05 | 南京理工大学 | Parking space detection system and method based on lora wireless communication technology |
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