CN109547927A - A kind of livestock locating and monitoring system and method based on LoRa technology - Google Patents
A kind of livestock locating and monitoring system and method based on LoRa technology Download PDFInfo
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- CN109547927A CN109547927A CN201811620195.4A CN201811620195A CN109547927A CN 109547927 A CN109547927 A CN 109547927A CN 201811620195 A CN201811620195 A CN 201811620195A CN 109547927 A CN109547927 A CN 109547927A
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
Abstract
The invention belongs to livestock management technical fields, disclose a kind of livestock locating and monitoring system and method based on LoRa technology；It is provided with livestock label；Livestock label is connect by wireless GPRS network with public base station by wireless LoRa network transmission livestock label electric signal to wireless relay gateway, wireless relay gateway, and public base station is connect by data line with data server, monitoring host computer, monitoring host computer/standby host；Location information is transferred to client by electric signal.Livestock locating and monitoring system provided by the invention realizes that free networking, equipment installation and distribution can be configured arbitrarily by the way of full Wireless covering；It is fast and simple to increase system equipment, livestock monitoring device is by realizing on-line real time monitoring of each monitoring unit on Terminal Server Client in mobile special network accessing Internet.
Description
Technical field
The invention belongs to livestock management technical field more particularly to a kind of livestock locating and monitoring systems based on LoRa technology
And method.
Background technique
Currently, the prior art commonly used in the trade is such that the continuous improvement taken in people, the public meat to livestock
Matter requirement is higher and higher, especially the free-ranging livestock meat of natural nuisance-free, obtains more and more favors.But the livestock of free-ranging
For raiser, there is the specific location for being difficult to obtain livestock, livestock easily wanders away, livestock number is not easy the problems such as counting.Base
In the livestock location technology of GPS, although positioning accuracy is higher, GPS technology power consumption is big, at high cost, is unfavorable in livestock
Large-scale application in positioning system.Livestock location technology based on RFID and unmanned plane corrects target position range using RSSI.
But in practical applications, once RSSI is blocked, range error just will appear very big fluctuation, be not easy steadily to obtain domestic animal
The specific location of poultry.And the coverage area of RFID is small, and the unmanned plane hang time is short, for the livestock of free-ranging, using single
Unmanned plane is in the presence of the risk that all livestocks can not be completely covered.
In conclusion problem of the existing technology is:
(1) easily there is very big fluctuation, are not easy in the existing livestock location technology based on RFID and unmanned plane, range error
Steadily obtain the specific location of livestock.
(2) coverage area of existing RFID is small, and the unmanned plane hang time is short, for the livestock of free-ranging, using single
Unmanned plane is in the presence of the risk that all livestocks can not be completely covered.
(3) the livestock location technology of existing GPS, although positioning accuracy is higher, GPS technology power consumption is big, cost
Height is unfavorable for the large-scale application in livestock positioning system.
Solve the difficulty and meaning of above-mentioned technical problem:
According to incompletely statistics, national livestock inventories amount ten thousand up to more than 50000 at present, wherein 60%~70% on grassland
It is herded using nomadic field-rotatable type free-ranging.With the intelligence of livestock aquaculture, informationization, the way to manage of free-ranging livestock is also mentioned
Gone out new demand, according to township, village, town administrative division free-ranging livestock different zone of action, the behaviour area of free-ranging livestock
Domain cannot be trans-regional, to be managed to free-ranging livestock.It can be seen that and herd according to the trial state of existing herding positioning system
Had a mind to after the people are on probation using with buyer up to 90%, cattle and sheep rich and influential family up to 100%, but mostly interviewed herdsman require monitoring system at
Originally low to be just ready that purchase uses.
It can be seen that there is very big demand, and this herding locating and monitoring in China nomadic area in livestock monitoring system
System combination LoRa technology, area coverage is big, battery is long, range error is small, and the cost of system is low, user Ke Tong
The distributing position and current state of remote monitoring center observation free-ranging livestock are crossed, is done after capable of there is transregional behavior to free-ranging livestock
Timely warning note out, be conducive to by animal husbandry realize accurate help-the-poor policy in the implementation of poverty-stricken area, therefore the system will
Have extraordinary development prospect.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of livestock locating and monitoring system based on LoRa technology
System,
The invention is realized in this way a kind of livestock locating and monitoring system based on LoRa technology, described based on LoRa
The livestock locating and monitoring system of technology, is provided with livestock label；
Livestock label passes through wireless LoRa network transmission livestock label electric signal to wireless relay gateway, wireless relay gateway
It is connect by wireless GPRS network with public base station, public base station is led by data line and data server, monitoring host computer, monitoring
Machine/standby host connection, is transferred to client for location information by electric signal.
Further, the livestock label is made of 4 parts, power management module, microprocessor, LoRa communication module and day
Line.
Wherein power management module is made of battery and power supply control chip circuit, and major function provides electricity for livestock label
Energy；LoRa communication module sends position data to wireless relay gateway using LoRa technology；Microprocessor major function is analysis
The data obtained from LoRa communication module, and control LoRa communication module and put row location information into wireless relay network and exchange；
Antenna emits for livestock label and receives LoRa wireless signal.
Further, the wireless relay gateway is made of 6 parts, power management module, microprocessor, storage equipment,
GPRS communication module, LoRa communication module and antenna.
It is each that cell voltage or external direct current power supply voltage are converted to wireless relay intra-gateway by power management module
The voltage rating that module needs；LoRa communication module is used to obtain the position of all livestock labels in wireless relay gateway coverage area
Confidence breath；Microprocessor is completed to control the working condition of LoRa communication module, GPRS communication module and storage equipment, just
The information data for each livestock label that step processing and amendment wireless relay gateway receive, and these data are saved in storage and are set
In standby；GPRS communication module is communicated using GPRS technology with public base station for wireless relay gateway, by livestock label
Information is uploaded to monitoring host computer；Storage equipment is kept away using large capacity ferroelectric memory for saving the data of each livestock label
Exempt from the case where loss of data occur when communication failure；Antenna for wireless relay gateway emit and receive LoRa wireless signal and
GPRS wireless signal.
Another object of the present invention is to provide described in a kind of application based on the livestock locating and monitoring system of LoRa technology
The livestock positioning and monitoring method based on LoRa technology, it is described fixed using TOA based on the livestock positioning and monitoring method of LoRa technology
Position technology calculates the distance between wireless relay gateway and livestock label, and specific ranging is as follows:
First time ranging:
1) wireless relay gateway sends ranging data packet to livestock label；
2) livestock label carries out automatic-answering back device to the distance measurement request of wireless relay gateway；
3) wireless relay gateway is calculated from data packet is issued to the propagation delay time T1 for receiving response；
4) livestock label starts timing when receiving the data packet of wireless relay gateway sending, and to wireless relay network
It closes and stops timing after issuing response message, obtain the processing delay time T2 of livestock label；
Second of ranging:
(1) livestock label sends the data packet comprising processing delay time T2 effective information to wireless relay gateway；
(2) livestock label receives the automatic-answering back device information of wireless relay gateway；
(3) livestock label calculates propagation delay time T3；
(4) in the same way, wireless relay gateway calculates the processing delay time T4 of oneself；
(5) livestock label sends the data packet comprising T3 information to wireless relay gateway；
(6) wireless relay network puts row distance calculating into:
Wireless relay gateway is d at a distance from livestock label, and the transmission range of wireless signal is just 4d, wireless relay gateway
It is obtained with the calculating at a distance from livestock label for d by following formula:
Wherein C is the light velocity.
Further, the livestock positioning and monitoring method based on LoRa technology uses the advanced wireless modulated based on LoRa logical
News technology herds the long-haul reliable wireless telecommunications under the complex environment of region using unique band spectrum modulation and forward error correction technique.
Further, the livestock positioning and monitoring method based on LoRa technology introduces GPRS technology, and equipment lays and pacifies
The Qu Junneng of dress, mobile network's covering is freely installed.
Another object of the present invention is to provide the livestock positioning and monitoring methods described in a kind of application based on LoRa technology
Information data processing terminal.
In conclusion advantages of the present invention and good effect are as follows: the livestock positioning provided by the invention based on LoRa technology
Monitoring system, the system obtain the location information of livestock using LoRa technology and upload to monitoring host computer by GPRS network.Prison
Control host shows the specific location of livestock on map, and judges whether livestock abnormality occurs.Finally to system
Range error value, livestock label power consumption and livestock display interface be tested, to holding for livestock aquaculture industry
Supervention exhibition provides technical support.
Livestock locating and monitoring system provided by the invention realizes free networking, equipment installation by the way of full Wireless covering
And distribution can be configured arbitrarily；It is fast and simple to increase system equipment, livestock monitoring device passes through in mobile special network accessing Internet, real
Now on-line real time monitoring of each monitoring unit on Terminal Server Client.
Detailed description of the invention
Fig. 1 is the livestock locating and monitoring system schematic diagram provided in an embodiment of the present invention based on LoRa technology；
Fig. 2 is TOA positioning principle schematic diagram provided in an embodiment of the present invention；
Fig. 3 is livestock label functional block diagram provided in an embodiment of the present invention；
Fig. 4 is wireless relay gateway functional block diagram provided in an embodiment of the present invention；
Fig. 5 is test schematic diagram of a scenario provided in an embodiment of the present invention；
Fig. 6 is average range error schematic diagram provided in an embodiment of the present invention；
Fig. 7 is the average range current diagram of livestock label provided in an embodiment of the present invention；
Fig. 8 is livestock locating and monitoring system monitoring interface schematic diagram provided in an embodiment of the present invention；
In figure, 1, livestock label；2, wireless relay gateway；3 public base stations；4, data server；5, monitoring host computer；6, it supervises
Control host/standby host；7, client.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Problem in view of the prior art, the present invention propose that livestock locating and monitoring system is realized by the way of full Wireless covering
Free networking, equipment installation and distribution can be configured arbitrarily；It is fast and simple to increase system equipment, livestock monitoring device passes through mobile special
In network accessing Internet, on-line real time monitoring of each monitoring unit on Terminal Server Client is realized；
It elaborates with reference to the accompanying drawing to livestock locating and monitoring system of the invention；
As shown in Figure 1, the livestock locating and monitoring system provided in an embodiment of the present invention based on LoRa technology includes: livestock mark
Sign 1, wireless relay gateway 2, public base station 3, data server 4, monitoring host computer 5, monitoring host computer/standby host 6, client 7；
Public base station 3 passes through the flow of purchase communication common carrier using the communication base station of existing movement, connection or telecommunications company
Card number passes to the data that wireless relay gateway 2 receives on the monitoring host computer 5 communicated with internet by 4G or 5G network.Prison
It controls host 5 and monitoring standby host 6 is used for installation monitoring system management software, and the data that preservation and backup receive.Client 7 is to use
Family mobile phone or computer are shown the position of livestock in 7 user interface of client by installing client software.
Livestock label 1 passes through wireless LoRa network transmission livestock label electric signal to wireless relay gateway 2, wireless relay network
It closes 2 to connect by wireless GPRS network with public base station 3, public base station 3 passes through data line and data server 4, monitoring host computer
5, monitoring host computer/standby host 6 connects, and location information is transferred to client 7 by electric signal.
System provided in an embodiment of the present invention uses the advanced wireless mechanics of communication modulated based on LoRa, is spread using uniqueness
Modulation and forward error correction technology herds the long-haul reliable wireless telecommunications under the complex environment of region.
System equipment provided in an embodiment of the present invention laying and installing, and introduces GPRS technology, the area of mobile network's covering
Can freely it install.
It is provided in an embodiment of the present invention in livestock locating and monitoring system, calculate wireless relay using TOA location technology
The distance between gateway and livestock label, specific ranging are as follows:
First time ranging:
1) wireless relay gateway sends ranging data packet to livestock label；
2) livestock label carries out automatic-answering back device to the distance measurement request of wireless relay gateway；
3) wireless relay gateway is calculated from data packet is issued to the propagation delay time T1 for receiving response；
4) livestock label starts timing when receiving the data packet of wireless relay gateway sending, and to wireless relay network
It closes and stops timing after issuing response message, obtain the processing delay time T2 of livestock label；
Second of ranging:
(1) livestock label sends the data packet comprising processing delay time T2 effective information to wireless relay gateway；
(2) livestock label receives the automatic-answering back device information of wireless relay gateway；
(3) livestock label calculates propagation delay time T3；
(4) in the same way, wireless relay gateway calculates the processing delay time T4 of oneself；
(5) livestock label sends the data packet comprising T3 information to wireless relay gateway.
(6) wireless relay network puts row distance calculating into:
Assuming that wireless relay gateway is d at a distance from livestock label, and in above-mentioned ranging process, the transmission of wireless signal
Distance is just 4d, and therefore, wireless relay gateway is obtained for the calculating of d by following formula (1) at a distance from livestock label:
Wherein C is the light velocity.
Livestock label provided in an embodiment of the present invention is made of 4 parts, power management module, microprocessor, LoRa communication
Module and antenna.
Wherein power management module is made of battery and power supply control chip circuit, and major function provides electricity for livestock label
Energy；LoRa communication module sends position data to wireless relay gateway using LoRa technology；Microprocessor major function is analysis
The data obtained from LoRa communication module, and control LoRa communication module and put row location information into wireless relay network and exchange；
Antenna emits for livestock label and receives LoRa wireless signal.
Wireless relay gateway provided in an embodiment of the present invention is made of 6 parts, power management module, microprocessor, storage
Equipment, GPRS communication module, LoRa communication module and antenna.
It is each that cell voltage or external direct current power supply voltage are converted to wireless relay intra-gateway by power management module
The voltage rating that module needs；LoRa communication module is used to obtain the position of all livestock labels in wireless relay gateway coverage area
Confidence breath；Microprocessor is completed to control the working condition of LoRa communication module, GPRS communication module and storage equipment, just
The information data for each livestock label that step processing and amendment wireless relay gateway receive, and these data are saved in storage and are set
In standby；GPRS communication module is communicated using GPRS technology with public base station for wireless relay gateway, by livestock label
Information is uploaded to monitoring host computer；Storage equipment is kept away using large capacity ferroelectric memory for saving the data of each livestock label
Exempt from the case where loss of data occur when communication failure；Antenna for wireless relay gateway emit and receive LoRa wireless signal and
GPRS wireless signal.
As shown in Fig. 2, TOA positioning principle provided in an embodiment of the present invention；
In livestock locating and monitoring system, calculated using TOA location technology between wireless relay gateway and livestock label
Distance.
As shown in figure 3, livestock label functional block diagram provided in an embodiment of the present invention；
Livestock label is carried by livestock, for sending the location information of livestock to wireless relay gateway.LoRa communication module
Row wireless data exchange is put by antenna and wireless relay network, the modulation and demodulation including wireless signal；Microprocessor is control
Livestock label processed sends the position data of label to wireless relay gateway periodically；Power management module control microprocessor and
LoRa communication module, in low power consumpting state, extends the use of livestock tag battery when not putting row into wireless relay network and communicating
Service life.
As shown in figure 4, wireless relay gateway functional block diagram；
Wireless relay gateway provided in an embodiment of the present invention is used to collect, store the location information of livestock, and passes through GPRS
Network uploads in mobile network.The microprocessor major function of wireless relay gateway is that control LoRa communication module is collected and divided
The information data of each livestock label in overlay area is analysed, and the information preservations such as position therein, number, time are set to storage
In standby.Then these information are uploaded in public network by GPRS communication module；Wireless relay gateway is using 12V battery or outside
It connects 12V DC power supply to be powered, 12V voltage is converted to by 3.3V and 2.5V voltage by power management module, be micro process
Device, LoRa communication module, GPRS communication module and storage equipment are powered.
The working principle of the invention is further elaborated below；
System is made of two-stage wireless network, and the first order is livestock label to wireless relay gateway, is communicated using LoRa；The
Second level is wireless relay gateway to public network base station, then arrives monitoring center, using GPRS network.The data that livestock label will monitor
It is sent initially to wireless relay gateway, then is shut by wireless relay network and passes to monitoring host computer.User can pass through cell phone, computer
And other networked devices check the more specific location information of livestock.
Livestock locating and monitoring system provided by the invention based on LoRa technology, the system obtain livestock using LoRa technology
Location information and monitoring host computer is uploaded to by GPRS network.Monitoring host computer shows the specific location of livestock on map
Come, and judges whether livestock abnormality occurs.Finally the range error value of system, livestock label power consumption and livestock are shown
Interface is tested, to provide technical support for the sustainable development of livestock aquaculture industry.
Application effect of the invention is explained in detail below with reference to test.
1 test results and analysis
1.1 experimental design
Circle indicates the wireless coverage of single wireless relay gateway in figure, and radius is 400 meters, i.e., it is single it is wireless in
The covering of all livestock labels within the scope of 400 meters of radius can be realized after gateway.
This pilot system is made of 4 wireless relay gateways and 17 livestock labels, and each wireless relay gateway is at a distance of about
560 meters, cover about 1.6 square kilometres of test areas.
1.2 test results and analysis
Location management of the livestock locating and monitoring system based on GIS geosystem can show the distribution feelings of livestock on map
Condition and status.
Fig. 6 illustrates each livestock physical location that this livestock locating and monitoring system obtains in its overlay area and surveys with it
Measure the mean error of position.From the available designed livestock locating and monitoring system measurement error of test result within 5 meters.
This more accurate position data has practical application value for the positioning to livestock is put in a suitable place to breed.
Fig. 7 illustrates average current of the livestock label in ranging, from the figure, it can be seen that livestock label ranging continues
Time is 25ms, and average range electric current is 13.8mA, if the ranging of progress in every ten seconds, the average operation electricity of livestock label
Stream is 34.5 μ A.When livestock label uses the CR2450 button cell of 520mAh, the service life of battery can reach a 1 year and a half left side
It is right.
Fig. 8 illustrates livestock and is herding the position distribution situation in region.This system can preset livestock simultaneously
Zone of action, if when individual livestocks have left specified zone of action, this system prompts on monitoring interface corresponding immediately
Warning information reduces the missing risk of livestock.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of livestock locating and monitoring system based on LoRa technology, which is characterized in that the livestock based on LoRa technology
Locating and monitoring system is provided with livestock label；
By wireless LoRa network transmission livestock label electric signal to wireless relay gateway, wireless relay gateway passes through livestock label
Wireless GPRS network is connect with public base station；Public base station by data line and data server, monitoring host computer, monitoring host computer/
Standby host connection；Location information is transferred to client by electric signal.
2. as described in claim 1 based on the livestock locating and monitoring system of LoRa technology, which is characterized in that the livestock label
It is made of 4 parts, power management module, microprocessor, LoRa communication module and antenna；
Power management module is made of battery and power supply control chip circuit, provides electric energy for livestock label；LoRa communication module
Position data is sent to wireless relay gateway using LoRa technology；Microprocessor is the number that analysis is obtained from LoRa communication module
According to, and control LoRa communication module and put row location information into wireless relay network and exchange；Antenna emits and connects for livestock label
Receive LoRa wireless signal.
3. as described in claim 1 based on the livestock locating and monitoring system of LoRa technology, which is characterized in that the wireless relay
Gateway is made of 6 parts, power management module, microprocessor, storage equipment, GPRS communication module, LoRa communication module and day
Line；
Cell voltage or external direct current power supply voltage are converted to wireless relay intra-gateway modules by power management module
The voltage rating needed；LoRa communication module is used to obtain the position letter of all livestock labels in wireless relay gateway coverage area
Breath；Microprocessor is completed to control the working condition of LoRa communication module, GPRS communication module and storage equipment, preliminary to locate
The information data for each livestock label that reason and amendment wireless relay gateway receive, and store data into storage equipment；
GPRS communication module is communicated using GPRS technology with public base station for wireless relay gateway, will be in the information of livestock label
Reach monitoring host computer；Storage equipment avoids communicating using large capacity ferroelectric memory for saving the data of each livestock label
There is the case where loss of data when failure；Antenna is wireless for the transmitting of wireless relay gateway and reception LoRa wireless signal and GPRS
Signal.
4. a kind of domestic animal based on LoRa technology for running the livestock locating and monitoring system described in claim 1 based on LoRa technology
Raise positioning and monitoring method, which is characterized in that it is described by the livestock positioning and monitoring method of LoRa technology using based on TOA location technology
The distance between wireless relay gateway and livestock label are calculated, specific ranging is as follows:
First time ranging:
1) wireless relay gateway sends ranging data packet to livestock label；
2) livestock label carries out automatic-answering back device to the distance measurement request of wireless relay gateway；
3) wireless relay gateway is calculated from data packet is issued to the propagation delay time T1 for receiving response；
4) livestock label starts timing when receiving the data packet of wireless relay gateway sending, and sends out to wireless relay gateway
Stop timing after response message out, obtains the processing delay time T2 of livestock label；
Second of ranging:
(1) livestock label sends the data packet comprising processing delay time T2 effective information to wireless relay gateway；
(2) livestock label receives the automatic-answering back device information of wireless relay gateway；
(3) livestock label calculates propagation delay time T3；
(4) in the same way, wireless relay gateway calculates the processing delay time T4 of oneself；
(5) livestock label sends the data packet comprising T3 information to wireless relay gateway；
(6) wireless relay network puts row distance calculating into:
Wireless relay gateway is d at a distance from livestock label, and the transmission range of wireless signal is just 4d, wireless relay gateway and domestic animal
The calculating that the distance of poultry label is d is obtained by following formula:
Wherein C is the light velocity.
5. as claimed in claim 4 based on the livestock positioning and monitoring method of LoRa technology, which is characterized in that described to be based on LoRa
The livestock positioning and monitoring method of technology uses the wireless telecommunications modulated based on LoRa, using unique band spectrum modulation and forward error correction,
Herd the long-haul reliable wireless telecommunications under the complex environment of region.
6. as claimed in claim 4 based on the livestock positioning and monitoring method of LoRa technology, which is characterized in that described to be based on LoRa
The livestock positioning and monitoring method of technology introduces GPRS, and equipment laying and installing, and the Qu Junneng of mobile network's covering is freely installed.
7. a kind of Information Number using the livestock positioning and monitoring method described in claim 4~6 any one based on LoRa technology
According to processing terminal.
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| CN112601188A (en) * | 2020-12-14 | 2021-04-02 | 深圳中科讯联科技股份有限公司 | Poultry management system |
| CN112601188B (en) * | 2020-12-14 | 2023-09-05 | 深圳中科讯联科技股份有限公司 | Poultry management system |
| CN113156463A (en) * | 2021-03-05 | 2021-07-23 | 成都航空职业技术学院 | Intelligent grazing system based on Beidou short message and monitoring method thereof |
| CN113156463B (en) * | 2021-03-05 | 2023-10-20 | 成都航空职业技术学院 | Intelligent grazing system based on Beidou short message and monitoring method thereof |
| CN114025437A (en) * | 2021-11-23 | 2022-02-08 | 重庆邮电大学 | LoRa intelligent safety helmet system ranging gateway scheduling method |
| CN114025437B (en) * | 2021-11-23 | 2023-05-23 | 重庆邮电大学 | LoRa intelligent safety helmet system ranging gateway scheduling method |
| CN115866625A (en) * | 2023-02-08 | 2023-03-28 | 成都航空职业技术学院 | Multi-base-station all-terrain complementary communication method and system |
| CN115866625B (en) * | 2023-02-08 | 2023-05-19 | 成都航空职业技术学院 | Multi-base-station all-terrain complementary communication method and system |
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