CN210781377U

CN210781377U - LoRaWAN thing networking gateway based on LBT

Info

Publication number: CN210781377U
Application number: CN201921657683.2U
Authority: CN
Inventors: 王彦凯; 靳林杰; 佟亚波; 徐海; 徐涛; 刘泽华; 陈永威; 顾超杰; 黄贤景; 张影; 章玺; 毛庭; 张家铭; 王彬杰; 范良洪; 胡燕清; 蒋磊
Original assignee: Zhejiang Lierda Core Technology Co ltd
Current assignee: Zhejiang Lierda Core Technology Co ltd
Priority date: 2019-09-30
Filing date: 2019-09-30
Publication date: 2020-06-16
Anticipated expiration: 2029-09-30

Abstract

The utility model discloses a LoRaWAN thing networking gateway based on LBT, including mechanical structure part and electronic circuit part, the electronic circuit part includes main control system and power supply system, main control system links to each other with LoRa radio frequency unit, LBT unit, location time service unit, audible-visual alarm unit, clock unit, monitor cell, sensor unit and ethernet unit respectively, LoRa radio frequency unit and LBT unit are equipped with the antenna respectively, the ethernet unit links to each other with the server, power supply system links to each other with each unit. The LBT circuit and the main radio frequency loop are independent, different antennas are used respectively, the two circuits are not affected with each other, the LBT circuit cannot cause shunting of radio frequency signals and additional noise introduction, the sensitivity and the reliability of the gateway are effectively improved, a high-performance cavity filter is added in the radio frequency sending loop, the requirement of KC authentication for radio frequency sending stray indexes is met, and the high-performance indexes of the radio frequency sending loop are guaranteed.

Description

LoRaWAN thing networking gateway based on LBT

Technical Field

The utility model relates to a network communication equipment especially relates to a LoRaWAN thing networking gateway based on LBT.

Background

On the KR920-923MHz frequency band of the LoRaWAN, based on the safety communication rule, it is required to specify the channel access rule by controlling the duty cycle limit or the LBT (listen Before talk) mode, and a solution scheme that is more common to the LoRaWAN of the KR920-923MHz ISM at present is to use the FPGA, SX1272 or the FPGA, SX1276 scheme to implement the LBT function. And the stray index of the radio frequency equipment with the radio frequency stray requirement of more than 25mW in the KC certification in the frequency band range of 904-915MHz is required to be less than-76 dBm.

In order to implement the LBT function, the existing design scheme is to directly connect a branch in parallel in the receiving loop, and this parallel branch may cause impedance discontinuity and splitting of radio frequency signals, theoretically, it may cause sensitivity reduction of at least 3dBm, and simultaneously, the parallel connected LBT branch may also introduce extra noise, which causes noise coefficient increase of the system, and the above factors may reduce the sensitivity of the receiving loop. The radio frequency radiation index in KC certification has high requirement, the existing scheme cannot be met, and the scheme of some manufacturers is to add a ceramic filter in a radio frequency transmission loop, but the ceramic filter can introduce higher insertion loss when realizing the suppression effect of more than 30dBm under 5MHz, so that the transmission power of radio frequency is reduced.

Disclosure of Invention

The utility model discloses mainly solve original LBT branch road and introduce the noise, reduce radiofrequency signal sensitivity, and be difficult to satisfy the technical problem to sending spurious requirement in radio frequency radiation index and the KC authentication, a LoRaWAN thing networking gateway based on LBT is provided, it is independent with LBT circuit and main radio frequency return circuit, use different antennas respectively, make two part circuit mutually not influence, LBT circuit can not lead to radiofrequency signal's reposition of redundant personnel and the extra noise of introducing, the sensitivity and the reliability of gateway have effectively been improved, and high performance's cavity filter has been added in the radio frequency transmission return circuit, both satisfy the demand of KC authentication, can not introduce higher insertion loss again, make the radio frequency transmission return circuit have higher performance index.

The above technical problem of the present invention can be solved by the following technical solutions: the utility model discloses a mechanical structure part and electronic circuit part, electronic circuit part include main control system and power supply system, main control system links to each other with loRa radio frequency unit, LBT unit, location time service unit, audible-visual alarm unit, clock unit, monitor cell, sensor unit and ethernet unit respectively, loRa radio frequency unit and LBT unit are equipped with the antenna respectively, the ethernet unit links to each other with the server, power supply system links to each other with each unit. The master control system is used for controlling the LoRa radio frequency unit, the LBT unit, the positioning time service unit, the sound-light alarm system, the clock unit, the system monitoring unit, the sensor unit, the expansion interface part and the Ethernet unit and carrying out information interaction. The LoRa radio frequency unit and the LBT unit are respectively connected with different antennas, so that the two parts of circuits are mutually independent and do not influence each other. The power supply system is used for converting external high-voltage direct current into internal required voltage.

Preferably, the mechanical structure part comprises an aluminum alloy metal shell, a power interface, a radio frequency interface, an Ethernet interface and a gateway fixing structure are arranged on the aluminum alloy metal shell, the power interface is connected with a power supply system, the radio frequency interface is connected with a LoRa radio frequency unit, the Ethernet interface is connected with an Ethernet unit, and the mechanical structure part has the waterproof grade of IP 67. The aluminum alloy shell effectively shields external interference signals and simultaneously reduces the radio frequency interference signals radiated outwards, the power supply interface, the radio frequency interface and the Ethernet interface are used for connecting each device, the gateway fixing structure is used for fixing the gateway, and the waterproof grade of IP67 prevents the gateway from being corroded by water to generate faults.

Preferably, the loRa RADIO frequency unit comprises a loRa gateway baseband chip U3, two chips SX1257A and chip SX1257B which are externally connected with the loRa gateway baseband chip U3, the chip SX1301 is adopted by the loRa gateway baseband chip U3,

pins

1, 6, 7, 10 and 11 of the loRa gateway baseband chip U3 are all grounded,

pins

2, 3, 4 and 5 of the loRa gateway baseband chip U3 are connected with the LBT unit, pin 8 of the loRa gateway baseband chip U3 is grounded through capacitors C16 and C17 which are connected in parallel, pin 9 of the loRa gateway baseband chip U3 is grounded through a resistor R16 and a GPS, and is grounded through a resistor R19, pin 12 of the loRa gateway baseband chip U3 is grounded through a capacitor C18, pin 13 of the loRa gateway baseband chip U3 is grounded through a resistor R588 and is grounded through a capacitor C3514A and LNA 27A which are connected with the LNA E baseband chip through an EN 24, a pin 15 of the LoRa gateway baseband chip U3 is connected with a pin PA EN A, a pin 16 of the LoRa gateway baseband chip U3 is grounded, a pin 17 and a pin 18 of the LoRa gateway baseband chip U3 are connected with a power supply system, a pin 19, a pin 20, a pin 21 and a pin 22 of the LoRa gateway baseband chip U3 are connected with a chip SX1257A, a pin 23 of the LoRa gateway baseband chip U3 is connected with a power supply and is connected with a grounded pin 24 in series with a capacitor C27, a pin 25 of the LoRa gateway baseband chip U3 is connected with a monitoring unit, a pin 29 of the LoRa gateway baseband chip U3 is sequentially connected with a resistor R25 and a capacitor C26 and is grounded, a pin 30, a pin 31, a pin 32, a pin 33 and a pin 34 of the LoRa gateway baseband chip U3 are grounded, a pin 35 of the LoRa gateway baseband chip U3 is connected with an IRXD B17 through a resistor R15, a pin 36 of the LoRa gateway baseband chip U3 is connected with the power supply system through a resistor R15, and a pin clock unit of the LoRa gateway chip U3,

pins

40 and 41 of a LoRa gateway baseband chip U3 are grounded, pin 42 of a LoRa gateway baseband chip U3 is grounded through a capacitor C15, pin 43 of the LoRa gateway baseband chip U3 is connected with a positioning time service unit through a resistor R13,

pins

44, 45, 46 and 47 of a LoRa gateway baseband chip U3 are connected with a chip SX1257A through resistors R10, R9, R8 and R7 respectively, pin 48 and pin 49 of a LoRa gateway baseband chip U3, pins 50 and 51 are connected with a direct current end through capacitors C6 and C7 which are connected in parallel, pin 52 of a LoRa gateway baseband chip U3 is grounded through capacitors C6 and C7 which are connected in parallel, pins 54, 55, 56, 57 and 58 of the LoRa gateway baseband chip U3 are connected with an LBT unit, pin 59 of a LoRa gateway baseband chip U3 is grounded, pin 60 of the LoRa gateway baseband chip U3 is grounded through capacitor C4, and pin 61, pin 62, pin 63 and pin 64 of a LoRa gateway baseband chip U3 are connected with a chip SX 1257B.

Preferably, the LBT unit includes a communication chip M1, a pin 1 and a pin 2 of the communication chip M1 are grounded, a pin 1 of the connector P1 is grounded via a capacitor C5 and is connected to a pin 13 of the communication chip M1 which is grounded via a capacitor C4, a pin 2 of the connector P1 is connected to a pin 4 of the connector P3, a pin 3 of the connector P1 is connected to a pin 3 of the connector P3, a pin 4 of the connector P1 is connected to a pin 17 of the communication chip M1 and is grounded, a pin 5 of the connector P1 is connected to a pin 18 of the communication chip M1 via a resistor R1, a pin 6 of the connector P1 is connected to a pin 19 of the communication chip M1 via a resistor R1, a pin 1 of the connector P1 is connected to a dc terminal, a pin 2 of the connector P1 is grounded, a pin 3 of the connector P1 is connected to a pin 9 of the communication chip M1 via a resistor R1, and a pin 4 of the connector P1 is connected to a resistor M1 of the communication chip M1 and a pin of the connector P1 is connected to a resistor P1 via a resistor R, the 1 pin of the connector P3 is grounded, the 2 pin of the connector P3 is connected with a direct current end, the 6 pin, the 12 pin, the 20 pin and the 21 pin of the communication chip M1 are grounded, the 22 pin of the communication chip M1 is connected with an antenna through a capacitor C1, and the connectors P1, P2 and P3 are respectively connected with a main control system and a LoRa radio frequency unit.

Preferably, the LoRa rf unit is connected to the main control system through the SPI and DIO interfaces for data exchange, and a radio frequency transmission loop of the LoRa rf unit includes a high-performance cavity filter. The high-performance cavity filter ensures that the stray parameters meet corresponding KC authentication indexes and has lower insertion loss.

Preferably, the expansion interface part comprises reserved functional interfaces which are not used by the main control unit, such as USB, SPI, USART and GPIO. The expansion interface is used for preparing the subsequent system expansion correspondingly.

The utility model has the advantages that: the LBT circuit and the main radio frequency loop are independent, different antennas are used respectively, the two circuits are not affected with each other, the LBT circuit cannot cause shunting of radio frequency signals and additional noise introduction, the sensitivity and the reliability of a gateway are effectively improved, a high-performance cavity filter is added in the radio frequency sending loop, the requirement of KC authentication is met, high insertion loss cannot be introduced, and the radio frequency sending loop has high performance indexes.

Drawings

Fig. 1 is a block diagram of a circuit principle connection structure of the present invention.

Fig. 2 is a circuit diagram of the LoRa rf unit of the present invention.

Fig. 3 is a circuit diagram of an LBT unit of the present invention.

In the figure, 1 a main control system, 2 a power supply system, 3 LoRa radio frequency unit, 4 LBT unit, 5 Ethernet unit, 6 positioning time service unit, 7 acousto-optic alarm unit, 8 clock unit, 9 monitoring unit, 10 sensor unit, 11 expansion interface unit, 12 antenna, 13 server

Detailed Description

The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.

Example (b): the LoRaWAN thing networking gateway based on LBT of this embodiment, as shown in FIG. 1, including mechanical structure part and electronic circuit part, wherein mechanical structure part includes aluminum alloy metal casing, installs power source, radio frequency interface and Ethernet interface on the aluminum alloy metal casing and is used for connecting each equipment, and shell surface mounting has gateway fixed knot to construct and is used for fixing the shell on wall body or equipment, avoids rocking and causes the gateway trouble, and the complete machine can realize IP 67's waterproof grade simultaneously. The electronic circuit part of the gateway comprises a main control system 1 and a power supply system 2, wherein the main control system 1 is respectively connected with a LoRa radio frequency unit 3, an LBT unit 4, a positioning time service unit 6, a sound and light alarm unit 7, a clock unit 8, a monitoring unit 9, a sensor unit 10, an expansion interface unit 11 and an Ethernet unit 5 so as to control each unit and carry out information interaction. The ethernet unit is used to connect with the server 13, and the LoRa rf unit and the LBT unit are respectively provided with their own antennas 12. The master control system 1 includes a CPU of Cortex-A8 up to a 1GHz master frequency, DDR3 RAM of 512MB, 8GB eMMC, and runs a linux operating system. The main control system can reliably run in the industrial full-temperature range, and has the function of online upgrading of the operating system and the APP.

LoRa radio frequency unit 3 and LBT unit 4 link to each other with different antennas 12 respectively, use the antenna that self links to each other separately for two parts circuit is independent each other, and each other does not influence, makes the gateway realize the LBT function on the basis that accords with safe communication requirement, ensures that receiver sensitivity does not receive the influence of LBT circuit. Wherein the LoRa rf unit 3 includes a LoRa gateway baseband chip U3 (in this embodiment, a chip SX1301) and two chips SX1257A and SX1257B externally connected thereto, as shown in fig. 2,

pins

1, 6, 7, 10, and 11 of the LoRa gateway baseband chip U3 are all grounded,

pins

2, 3, 4, and 5 of the LoRa gateway baseband chip U3 are connected to the LBT unit 4, pin 8 of the LoRa gateway baseband chip U3 is grounded through capacitors C16 and C17 connected in parallel, pin 9 of the LoRa gateway baseband chip U3 is grounded through a resistor R16 and a resistor R19 while being connected to the GPS, pin 12 of the LoRa gateway baseband chip U3 is grounded through a capacitor C18, pin 13 of the LoRa gateway baseband chip U3 is grounded through a resistor R582 while being connected to an ENA pin and a capacitor C23 while being connected to the ground, pin of the LoRa gateway baseband chip U59692 is connected to the resistor R6314 through an eai resistor R6314 and an eai resistor R638, a pin 15 of the LoRa gateway baseband chip U3 is connected with a pin PA EN A, a pin 16 of the LoRa gateway baseband chip U3 is grounded, a pin 17 and a pin 18 of the LoRa gateway baseband chip U3 are connected with the power supply system 2, a pin 19, a pin 20, a pin 21 and a pin 22 of the LoRa gateway baseband chip U3 are connected with the chip SX1257A, a pin 23 of the LoRa gateway baseband chip U3 is connected with a power supply and is connected with a 24 pin which is grounded in series with a capacitor C27, a pin 25 of the LoRa gateway baseband chip U3 is connected with the monitoring unit 9, a pin 29 of the LoRa gateway baseband chip U3 is sequentially connected with a resistor R25 and a capacitor C26 and is grounded, a pin 30, a pin 31, a pin 32, a pin 33 and a pin 34 of the LoRa gateway baseband chip U3 are grounded, a pin 35 of the LoRa gateway baseband chip U3 is connected with the IRXD B through a resistor R17, a pin 36 of the LoRa gateway baseband chip U3 is connected with a pin 15 of the power supply system and a pin 58R 29 of the power supply system is connected with the clock unit of the, the 40 pins and 41 pins of the LoRa gateway baseband chip U3 are grounded, the 42 pin of the LoRa gateway baseband chip U3 is grounded through a capacitor C15, the 43 pin of the LoRa gateway baseband chip U3 is connected with the positioning time service unit 6 through a resistor R13, the 44 pin, 45 pin, 46 pin and 47 pin of the LoRa gateway baseband chip U3 are connected with the chip SX1257A through resistors R10, R9, R8 and R7 respectively, the 48 pin, 49 pin, 50 pin and 51 pin of the LoRa gateway baseband chip U3 are connected with the direct current end through capacitors C6 and C7 which are connected in parallel, the 52 pin of the LoRa gateway baseband chip U3 is grounded through capacitors C6 and C7 which are connected in parallel, the 54 pin, 55 pin, 56 pin, 57 pin and 58 pin of the LoRa gateway baseband chip U3 are connected with the LBT unit 4, the pin 59 pin of the LoRa gateway baseband chip U3 is grounded, the LoRa gateway baseband chip U60 pin 5960, 60 pin of the LoRa gateway baseband chip U4 and the chip is connected with the LBT chip U599 pin 599 and the chip 599 pin 599, LoRa radio frequency unit 3 passes through SPI interface and DIO interface and links to each other and carry out data interchange with master control system 1, including high performance's cavity filter in LoRa radio frequency unit 3's the radio frequency transmission return circuit. The high-performance cavity filter ensures that the stray parameters meet corresponding KC authentication indexes and has lower insertion loss.

As shown in fig. 3, the LBT unit 4 includes a communication chip M1, the model number of which is LSD4WN-2L717M90, the 1 and 2 pins of the communication chip M1 are grounded, the 1 pin of the connector P1 is grounded via a capacitor C5 and is connected to the 13 pin of the communication chip M1 which is grounded via a capacitor C4, the 2 pin of the connector P1 is connected to the 4 pin of the connector P3, the 3 pin of the connector P1 is connected to the 3 pin of the connector P3, the 4 pin of the connector P3 is connected to the 17 pin of the communication chip M3 and is grounded, the 5 pin of the connector P3 is connected to the 18 pin of the communication chip M3 via a resistor R3, the 6 pin of the connector P3 is connected to the 19 pin of the communication chip M3 via a resistor R3, the 1 pin of the connector P3 is connected to the dc terminal, the 2 pin of the P3 is grounded, the 3 pin of the connector P3 is connected to the communication chip M3 via a resistor R3610, and the communication chip M3 is connected to the connector P3 via a resistor R3, the pin 5 of the connector P2 is connected with the pin 14 of the communication chip M1 through a resistor R5, the pin 1 of the connector P3 is grounded, the pin 2 of the connector P3 is connected with a direct current end, the

pins

6, 12, 20 and 21 of the communication chip M1 are grounded, the pin 22 of the communication chip M1 is connected with an antenna through a capacitor C1, and the connectors P1, P2 and P3 are respectively connected with the main control system 1 and the LoRa radio frequency unit 3.

The ethernet unit 5 includes a PHY chip and an ethernet transformer, the ethernet unit 5 is connected to the main control system 1 and the server 13 through an MII interface for data communication, so that 10/100M data interaction capability can be realized, and a protection circuit is disposed on a network interface of the ethernet unit 5, so as to ensure that the ethernet unit 5 can normally operate under external interference, thereby enhancing system reliability. The power supply system 2 comprises a DC/DC converter and an LDO (low dropout regulator), wherein the input end of the DC/DC converter is connected with an external direct current power supply, the output end of the DC/DC converter is connected with the input end of the LDO, and the output end of the LDO is connected with each unit of the electronic circuit part. The gateway of the embodiment belongs to direct current power supply, an external direct current power supply supplies power for a power supply system, and power is supplied separately in the gateway according to the condition of each unit. The power supply system first uses a DC/DC converter to reduce the external high voltage DC to a low voltage, and then uses a LDO (low dropout regulator) to convert the voltage to 3.3V for the digital part.

The positioning time service unit 6 mainly has two functions, and the main control system 1 firstly communicates with the positioning time service unit 6 through a serial port to acquire longitude and latitude coordinate information and uploads the longitude and latitude coordinate information to the server 13, so that subsequent positioning and accurate maintenance are facilitated. Meanwhile, the positioning time service unit 6 can provide a pulse-per-second signal for the master control system 1 and the LoRa radio frequency unit 3, beacon can be realized according to real time for the LoRa radio frequency unit 3, and time synchronization of the whole network is guaranteed. The sound-light alarm unit 7 is controlled by the main control system 1 and is used for realizing sound-light indication of various states of the system, so that a user and a developer can conveniently judge the working state of the system according to various indications, man-machine simple interaction is realized, and corresponding processing is timely carried out. The clock unit 8 communicates with the master control system through an IIC interface, the clock unit 8 is provided with a standby power supply, and the standby power supply ensures that the clock unit normally operates when the power supply of the system is powered off, so that the system can reliably record various data. Monitoring unit 9 is mainly through watchdog chip real-time supervision system's feed dog pulse, in time judges the running state of system and APP, can in time reset the system when system or APP operation is unusual, prevents the system's dead halt, and the chip has the low-voltage reset function simultaneously, guarantees that the system operates when voltage is unusual again and prevents that the system from makeing mistakes unusually. The sensor unit 10 comprises a temperature sensor and a humidity sensor, and the main control system 1 is connected with the temperature sensor and the humidity sensor through IIC interfaces. The main control system 1 judges whether the inside of the gateway is abnormal such as short circuit, water inflow and the like by analyzing the information collected by the temperature sensor and the humidity sensor, and uploads the temperature and humidity information to the server 13 so as to remind a system administrator to take corresponding measures. The expansion interface part 11 includes reserved functional interfaces such as USB, SPI, USART, and GPIO that are not used by the main control unit, and makes corresponding consideration for subsequent system expansion.

When the gateway works, the LoRa radio frequency unit 3 and the main control system 1 exchange data through the SPI and the DIO interface, the main control unit 1 processes received LoRaWAN data and then carries out data communication with the Ethernet unit 5 through the MII interface, the Ethernet unit 5 uploads the processed LoRaWAN data to the corresponding server 13, and meanwhile, the main control unit 1 issues an instruction according to the data of the server 13 to issue corresponding data. The LBT unit controls the LoRa radio frequency chip through the control system, monitors the service condition of the corresponding air channel in real time, and when the server sends an instruction under certain data of the channel, the LBT unit can assist the main control system to judge whether to execute the instruction of the server, so that the LBT function is realized.

Claims

1. The utility model provides a LoRaWAN thing networking gateway based on LBT, includes mechanical structure part and electronic circuit part, its characterized in that, electronic circuit part includes major control system (1) and power supply system (2), major control system links to each other with LoRa radio frequency unit (3), LBT unit (4), location time service unit (6), audible and visual alarm unit (7), clock unit (8), monitor cell (9), sensor unit (10) and Ethernet unit (5) respectively, LoRa radio frequency unit (3) and LBT unit (4) are equipped with antenna (12) respectively, Ethernet unit (5) link to each other with server (13), power supply system (2) link to each other with each unit.

2. The LoRaWAN Internet of things gateway based on LBT (local binary translation) of claim 1, wherein the mechanical structure part comprises an aluminum alloy metal shell, a power supply interface, a radio frequency interface, an Ethernet interface and a gateway fixing structure are arranged on the aluminum alloy metal shell, the power supply interface is connected with a power supply system (2), the radio frequency interface is connected with a LoRa radio frequency unit (3), the Ethernet interface is connected with an Ethernet unit (5), and the mechanical structure part is provided with a waterproof grade of IP 67.

3. The LoRa WAN Internet of things gateway based on LBT (local area network) as claimed in claim 1, wherein the LoRa RADIO frequency unit (3) comprises a LoRa gateway baseband chip U3, two chips SX1257A and chip SX1257B which are externally connected with the LoRa gateway baseband chip U3, an SX1301 chip is adopted by the LoRa gateway baseband chip U3, 1 pin, 6 pin, 7 pin, 10 pin and 11 pin of the LoRa gateway baseband chip U3 are all grounded, 2 pin, 3 pin, 4 pin and 5 pin of the LoRa gateway baseband chip U3 are connected with the LBT unit (RADD 4), 8 pin of the LoRa gateway baseband chip U3 is grounded through capacitors C16 and C17 which are connected in parallel, 9 pin of the LoRa gateway baseband chip U3 is grounded through a resistor R16 and then connected with a GPS and then through a resistor R19, 12 pin of the LoRa gateway baseband chip U3 is grounded through a capacitor C18, pin of the LoRa gateway baseband chip U3 is grounded through a resistor R68613 pin connected with a LNA 3513A and then connected with a LNA 19A and then connected through a capacitor C24A and then connected with a LNA 19A and then connected through a resistor A and then connected with the LNA 19A and then connected through the LNA 7 The 15 pin of the LoRa gateway baseband chip U3 is connected with a PA EN A pin, the 16 pin of the LoRa gateway baseband chip U3 is grounded, the 17 pin and the 18 pin of the LoRa gateway baseband chip U3 are connected with a power supply system (2), the 19 pin, the 20 pin, the 21 pin and the 22 pin of the LoRa gateway baseband chip U3 are connected with a chip SX1257A, a capacitor C27 is connected in series between the 23 pin of the LoRa gateway baseband chip U3 and a 24 pin which is grounded while being connected with a power supply, the 25 pin of the LoRa gateway baseband chip U3 is connected with a monitoring unit (9), the 29 pin of the LoRa gateway baseband chip U3 is sequentially connected with a resistor R25 and a capacitor C26 and grounded, the 30 pin, the 31 pin, the 32 pin, the 33 pin and the 34 pin of the LoRa gateway baseband chip U3 are grounded, the 35 pin of the LoRa gateway baseband chip U3 is connected with an IRXD B through a resistor R17, the pin 36 of the LoRa gateway chip U3 is connected with a power supply system R582 and a resistor R15 and a clock unit (39) of the LoRa gateway baseband chip U5968, pins 40 and 41 of a LoRa gateway baseband chip U3 are grounded, pin 42 of the LoRa gateway baseband chip U3 is grounded through a capacitor C15, pin 43 of the LoRa gateway baseband chip U3 is connected with a positioning time service unit (6) through a resistor R13, pins 44, 45, 46 and 47 of the LoRa gateway baseband chip U3 are connected with a chip SX1257A through resistors R10, R9, R8 and R7 respectively, pin 48 and pin 49 of the LoRa gateway baseband chip U3, pins 50 and 51 are connected with a direct current end through capacitors C6 and C7 which are connected in parallel, pin 52 of a LoRa gateway baseband chip U3 is grounded through capacitors C6 and C7 which are connected in parallel, pins 54, 55, 56, 57 and 58 of the LoRa gateway baseband chip U3 are connected with an LBT unit (4), pin 59 of a LoRa gateway baseband chip U3 is grounded, pin 60 of the LoRa gateway baseband chip U3 is grounded through capacitor C4, and pin 61, pin 62, pin 63 and pin 64 of a LoRa gateway baseband chip U3 are connected with a chip SX 1257B.

4. An LBT-based LoRaWAN internet of things gateway according to claim 1 or 3, wherein the LBT unit (4) includes a communication chip M1, wherein the 1 and 2 pins of the communication chip M1 are grounded, the 1 pin of the connector P1 is grounded via a capacitor C5 and is connected to the 13 pin of the communication chip M1 grounded via a capacitor C4, the 2 pin of the connector P1 is connected to the 4 pin of the connector P3, the 3 pin of the connector P1 is connected to the 3 pin of the connector P3, the 4 pin of the connector P1 is connected to the 17 pin of the communication chip M1 and is grounded, the 5 pin of the connector P1 is connected to the 18 pin of the communication chip M1 via a resistor R2, the 6 pin of the connector P1 is connected to the 19 pin of the communication chip M1 via a resistor R1, the 1 pin of the connector P2 is connected to the dc terminal, the 2 pin of the connector P2 is grounded, the 3 pin of the connector P2 is connected to the communication chip M3 via a resistor R3, and the communication chip 3 is connected to the communication chip 3 via a resistor R3, the pin 5 of the connector P2 is connected with the pin 14 of the communication chip M1 through a resistor R5, the pin 1 of the connector P3 is grounded, the pin 2 of the connector P3 is connected with a direct current end, the pins 6, 12, 20 and 21 of the communication chip M1 are grounded, the pin 22 of the communication chip M1 is connected with an antenna through a capacitor C1, and the connectors P1, P2 and P3 are respectively connected with a main control system (1) and a LoRa radio frequency unit (3).

5. The LoRaWAN Internet of things gateway based on LBT (local binary system for transmission) as claimed in claim 1, 2 or 3, wherein the LoRa radio frequency unit (3) is connected with the main control system (1) through SPI and DIO interfaces for data exchange, and a radio frequency transmission loop of the LoRa radio frequency unit (3) comprises a high-performance cavity filter.

6. The LoRaWAN Internet of things gateway based on LBT (local binary translation) as claimed in claim 1, 2 or 3, characterized in that the gateway comprises an expansion interface part (11), wherein the expansion interface part (11) comprises reserved functional interfaces USB, SPI, USART and GPIO which are not used by the main control unit.