CN112004185B - Dual-mode communication base station and Bluetooth positioning system - Google Patents

Dual-mode communication base station and Bluetooth positioning system Download PDF

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Publication number
CN112004185B
CN112004185B CN202010801011.5A CN202010801011A CN112004185B CN 112004185 B CN112004185 B CN 112004185B CN 202010801011 A CN202010801011 A CN 202010801011A CN 112004185 B CN112004185 B CN 112004185B
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chip
module
base station
pin
unit
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CN112004185A (en
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吴春
赵元国
余旭
陈小磊
刘满红
陈军慧
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CETHIK Group Ltd
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CETHIK Group Ltd
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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
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a dual-mode communication base station and a Bluetooth positioning system, wherein the dual-mode communication base station comprises a central processing unit, a 2.4G communication unit, a LoRa communication unit, an Ethernet unit and a power supply unit; the Bluetooth positioning system is realized based on the dual-mode communication base station. The dual-mode communication base station of the invention integrates gateway function, can directly transmit the information data received by 2.4G or LoRa communication to the public network, and reduces construction difficulty and cost; the dual-mode communication base station integrates LoRa communication and 2.4G communication, the 2.4G communication is utilized to meet the positioning requirement of short distance and high concurrency, the LoRa communication is utilized to meet the positioning requirement of long distance and low concurrency, the communication problems that office areas are concentrated, the number of people in dangerous operation areas is small, and the distance from the office areas is long are solved, and the hardware layout cost is reduced.

Description

Dual-mode communication base station and Bluetooth positioning system
Technical Field
The application belongs to the technical field of communication, and particularly relates to a dual-mode communication base station and a Bluetooth positioning system.
Background
In a bluetooth-based people positioning system, four devices, a beacon, a tag, a base station, and a gateway, are typically included. The beacon provides physical position coordinates and sends a broadcast data packet at regular time; the tag scans the broadcast data packet at regular time to obtain an RSSI (received signal strength) value (received signal strength) of a corresponding beacon, and then packs the data at regular time and sends the data to the base station; the base station has certain coverage and can be used for receiving data packets uploaded by all tags in one region; and the gateway is connected with the base station and forwards the data collected by the base station to the public network.
There are many implementations of the existing base station, for example, there are 433M LoRa communication base station, 2.4G Zigbee communication base station, 2.4G bluetooth communication base station, and so on.
Among them, the LoRa communication has an advantage of a long transmission distance, but causes a small amount of concurrency due to a long aperture time in the communication. In 2.4G communication, the aperture time is generally about 1ms, and the time is very short, so that the amount of concurrency is large, but the communication distance is short, and about ten meters is obtained without adding a PA (power amplifier). Both communication technologies can meet specific scene requirements, but are not suitable for certain scenes (centralized office areas, few people in dangerous operation areas and about 1KM away from the office areas). Although the LoRa base station can meet the positioning of personnel in dangerous operation areas, a large number of base stations are required to be input in office areas, and the cost is increased. By using the 2.4G base station, although the positioning of personnel in an office area can be met, and coverage can be met by possibly several base stations, for a dangerous operation area, the base station needs to be separately deployed in the area, so that the difficulty and the cost of field deployment construction are increased.
Disclosure of Invention
The application aims to provide a dual-mode communication base station and a Bluetooth positioning system, which can simultaneously meet the requirements of short-distance and long-distance information transmission and effectively reduce the hardware layout cost.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
A dual-mode communication base station is used for information transfer with a mobile terminal and comprises a central processing unit, a 2.4G communication unit, an LoRa communication unit, an Ethernet unit and a power supply unit;
the 2.4G communication unit is used for receiving information data transmitted by the mobile terminal in the first range and sending the information data to the central processing unit;
the LoRa communication unit is used for receiving information data transferred by mobile terminals in a second range and sending the information data to the central processing unit, and the second range is farther away from the dual-mode communication base station than the first range;
the central processing unit is used for receiving the information data sent by the 2.4G communication unit and the LoRa communication unit and issuing an uploading instruction to the Ethernet unit;
the Ethernet unit is used for receiving an uploading instruction issued by the central processing unit and uploading the information data received by the central processing unit to a public network;
and the power supply unit is used for supplying power to the central processing unit, the 2.4G communication unit, the LoRa communication unit and the Ethernet unit.
Preferably, the 2.4G communication unit includes a 2.4G data receiving module and a bluetooth beacon broadcast packet transmitting module;
the 2.4G data receiving module comprises a wireless transceiving chip connected with the central processing unit, a first radio frequency processing module connected with the wireless transceiving chip and an antenna connected with the first radio frequency processing module;
bluetooth beacon broadcast package sending module include with the microcontroller of taking bluetooth function in that central processing unit connects, with the second radio frequency processing module that the microcontroller of taking bluetooth function in was connected and with the antenna that second radio frequency processing module connects.
Preferably, the wireless transceiver chip of the 2.4G data receiving module is an nRF24L01 chip, and the first radio frequency processing module of the 2.4G data receiving module includes a first RFX2401C chip;
the nRF24L01 chip is connected with the central processing unit through an SPI communication interface, the SPI communication interface of the nRF24L01 chip comprises pins 1, 2, 3, 4 and 5, the 11 th pin of the nRF24L01 chip is connected with a filter capacitor C319, the other end of the filter capacitor C319 is grounded, the 12 th pin of the nRF24L01 chip is connected with an inductor L302, the other end of the inductor L302 is respectively connected with the 11 th pin of the nRF24L01 chip and a capacitor C320, the other end of the capacitor C320 is grounded, the 13 th pin of the nRF24L01 chip is connected with an inductor L301, the other end of the inductor L301 is connected with the 12 th pin of the nRF24L01 chip, the 13 th pin of the nRF24L01 chip is further connected with an inductor L300, the other end of the inductor L300 is connected with a capacitor C313, the other end of the capacitor C313 is connected with the first RFX2401C chip, and the other end of the capacitor C313 is further grounded through a second harmonic filter capacitor C314.
Preferably, the 4 th pin of the first RFX2401C chip is connected to the other end of the capacitor C313 through a dc blocking capacitor C1677, the 10 th pin of the first RFX2401C chip is connected to an SMA connector J303 through a dc blocking capacitor C315, and the SMA connector J303 is connected to an antenna of the 2.4G data receiving module.
Preferably, the microcontroller with the bluetooth function in the bluetooth beacon broadcast packet sending module is an NRF52832 chip, and the second radio frequency processing module of the bluetooth beacon broadcast packet sending module includes a second RFX2401C chip;
the NRF52832 chip is connected with the central processing unit through a serial communication interface, the serial communication interface of the NRF52832 chip comprises 11 th, 14 th and 16 th pins, wherein the 11 th and 16 th pins are sending ports, the 14 th pin is a receiving port, and the 14 th pin is matched with one of the 11 th and 16 th pins to be connected and communicated with the central processing unit;
the 30 th pin of the NRF52832 chip is connected with the second RFX2401C chip through an impedance matching circuit, the impedance matching circuit includes a capacitor C370 and an inductor L306, one end of the capacitor C370 is connected with the 30 th pin of the NRF52832 chip, one end of the capacitor C370 is grounded, one end of the inductor L306 is connected with the 30 th pin of the NRF52832 chip, and the other end of the inductor L306 is connected with the second RFX2401C chip.
Preferably, the LoRa communication unit includes an LoRa gateway connected to the central processing unit, and an antenna connected to the LoRa gateway.
Preferably, the power supply unit includes a POE power module and a DCDC module;
the POE power module is used for acquiring power from a POE switch or equipment with POE power supply and outputting 5V voltage to the DCDC module;
the DCDC module is used for converting 5V voltage input by the POE power module into 3.3V voltage, and the central processing unit, the 2.4G communication unit, the LoRa communication unit and the Ethernet unit supply power.
The application also provides a bluetooth positioning system, which comprises a beacon, a tag, a server and the dual-mode communication base station in any technical scheme.
Preferably, the tags comprise tags in a first range and tags in a second range;
the label in the first range carries out information data transmission with a 2.4G communication unit of the dual-mode communication base station;
and the tags in the second range carry out information data transmission with the LoRa communication unit of the dual-mode communication base station.
Preferably, the 2.4G communication unit comprises a Bluetooth beacon broadcast packet sending module, and the Bluetooth beacon broadcast packet sending module sends beacon broadcast packets outwards at regular time;
the label regularly scans the beacon broadcast packet sent by the Bluetooth beacon broadcast packet sending module, and if the beacon broadcast packet is scanned, the label is in a first range; otherwise, it is a label in the second range.
According to the dual-mode communication base station and the Bluetooth positioning system, the dual-mode communication base station is integrated with a gateway function, information data received by 2.4G or LoRa communication can be directly forwarded to a public network, and construction difficulty and cost are reduced; the dual-mode communication base station integrates LoRa communication and 2.4G communication, the 2.4G communication is utilized to meet the positioning requirement of short distance and high concurrency, the LoRa communication is utilized to meet the positioning requirement of long distance and low concurrency, the communication problems that office areas are concentrated, the number of people in dangerous operation areas is small, and the distance from the office areas is long are solved, and the hardware layout cost is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a dual-mode communication base station according to the present application;
fig. 2 is a flowchart of the operation of the bluetooth beacon broadcast packet transmitting module according to the present application;
fig. 3 is a circuit structure diagram of an embodiment of a wireless transceiver chip of the 2.4G data receiving module of the present application;
fig. 4 is a circuit structure diagram of an embodiment of a radio frequency processing module of the 2.4G data receiving module of the present application;
fig. 5 is a circuit configuration diagram of an embodiment of a microcontroller with a bluetooth function in a bluetooth beacon broadcast packet transmitting module according to the present application;
fig. 6 is a circuit structure diagram of an embodiment of a radio frequency processing module of the bluetooth beacon broadcast packet transmitting module according to the present application;
FIG. 7 is a main flow chart of the central processing unit of the present application;
FIG. 8 is a flowchart of a serial port receive interrupt service routine of the present application;
FIG. 9 is a flowchart of the SPI receive interrupt server subroutine of the present application;
fig. 10 is a schematic structural diagram of the bluetooth positioning system of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
In one embodiment, a dual-mode communication base station is provided, which is used for information transmission with a mobile terminal, and adopts a dual-communication mode in the transmission process, so as to satisfy various conditions such as uneven distribution of the mobile terminal position or uneven distribution density.
It is easy to understand that the mobile terminal in this embodiment is understood as a device capable of exchanging information with the dual-mode communication base station, which may be a mobile phone, a PC, or a tag.
As shown in fig. 1, the dual-mode communication base station in this embodiment includes a central processing unit, a 2.4G communication unit, an LoRa communication unit, an ethernet unit, and a power supply unit.
The 2.4G communication unit is used for receiving the information data transmitted by the mobile terminals in the first range and sending the information data to the central processing unit.
And the LoRa communication unit is used for receiving the information data transferred by the mobile terminal in the second range and sending the information data to the central processing unit, and the second range is farther away from the dual-mode communication base station than the first range, namely, the mobile terminal closer to the base station communicates with the base station through the 2.4G communication unit, and the mobile terminal farther away from the base station communicates with the base station through the LoRa communication unit.
And the central processing unit is used for receiving the information data sent by the 2.4G communication unit and the LoRa communication unit and issuing an uploading instruction to the Ethernet unit.
And the Ethernet unit is used for receiving an uploading instruction issued by the central processing unit and uploading the information data received by the central processing unit to the public network.
And the power supply unit is used for supplying power to the central processing unit, the 2.4G communication unit, the LoRa communication unit and the Ethernet unit.
The dual-mode communication base station of the embodiment combines the Ethernet unit to realize the function of combining with the gateway, and can directly forward information data received by 2.4G or LoRa communication to the public network, thereby reducing the construction difficulty and cost; and the dual-mode communication base station integrates LoRa communication and 2.4G communication, the 2.4G communication is utilized to meet the positioning requirement of short distance and high concurrency, the LoRa communication is utilized to meet the positioning requirement of long distance and low concurrency, the communication problems of centralized office areas, few people in dangerous operation areas and long distance from the office areas are solved, and the hardware layout cost is reduced.
In order to flexibly switch the communication mode applicable to each mobile terminal, the 2.4G communication unit in this embodiment includes a 2.4G data receiving module and a bluetooth beacon broadcast packet transmitting module.
The 2.4G data receiving module comprises a wireless transceiving chip connected with the central processing unit, a first radio frequency processing module connected with the wireless transceiving chip and an antenna connected with the first radio frequency processing module.
The Bluetooth beacon broadcast packet sending module comprises a Microcontroller (MCU) with a Bluetooth function connected with the central processing unit, a second radio frequency processing module connected with the MCU with the Bluetooth function, and an antenna connected with the second radio frequency processing module.
The 2.4G data receiving module ceaselessly receives information data uploaded by all mobile terminals in a 2.4G mode under the coverage of the base station, wherein the first radio frequency processing module is a low-noise amplifier and aims to increase the receiving sensitivity of the 2.4G data receiving module and further increase the range of the base station for receiving data.
The Bluetooth beacon broadcast packet sending module sends beacon broadcast packets outwards periodically, the mobile terminals scan the packets, and once the packets are scanned, the mobile terminals are located in the coverage range of the base station, so that the communication modes suitable for each mobile terminal are switched flexibly. The second radio frequency processing module is a power amplifier and aims to increase the signal sending power and further increase the signal transmission distance.
The time interval value for sending beacon broadcast packets is very critical, and the too fast time interval value can influence the mobile terminal to receive other beacon broadcast packets nearby; too slow may result in the mobile terminal not receiving beacon broadcast packets from the base station. In this embodiment, the time interval for sending beacon broadcast packets is preferably 100ms.
It should be noted that, in the present application, the range of the mobile terminal is detected based on the bluetooth beacon broadcast packet sending module, the communication mode that the mobile terminal uses best is flexibly switched, and the work flow of the bluetooth beacon broadcast packet sending module is implemented based on the existing work flow. For example, as shown in fig. 2, an alternative workflow is as follows:
step 1: initializing a system, including Bluetooth protocol stack initialization, flash storage initialization, timer initialization and broadcast initialization;
step 2: managing low power consumption, and enabling the system to enter a low power consumption mode;
and step 3: the protocol stack judges whether the timing time is up, if yes, the step 4 is entered; otherwise, jumping to the step 2;
and 4, step 4: and transmitting the Beacon broadcast packet.
For the circuit structure in the 2.4G communication unit, it can be implemented based on the existing circuit, but in order to ensure the stability of the circuit operation and improve the strength and stability of the 2.4G communication and beacon broadcast packets, in an embodiment, a preferred circuit structure is provided as follows:
in this embodiment, the wireless transceiver chip of the 2.4G data receiving module is an nRF24L01 chip, and the radio frequency processing module of the 2.4G data receiving module includes a first RFX2401C chip.
As shown in fig. 3, the nRF24L01 chip is connected to the central processing unit through an SPI communication interface, and the SPI communication interface of the nRF24L01 chip includes 1 st, 2 nd, 3 th, 4 th, and 5 th pins, wherein the 5 th pin is connected to the central processing unit through a current limiting resistor R310.
A 11 th pin of the nRF24L01 chip is connected to a filter capacitor C319, the other end of the filter capacitor C319 is grounded, a 12 th pin of the nRF24L01 chip is connected to an inductor L302, the other end of the inductor L302 is connected to the 11 th pin of the nRF24L01 chip and a capacitor C320, the other end of the capacitor C320 is grounded, a 13 th pin of the nRF24L01 chip is connected to an inductor L301, the other end of the inductor L301 is connected to the 12 th pin of the nRF24L01 chip, the 13 th pin of the nRF24L01 chip is further connected to an inductor L300, the other end of the inductor L300 is connected to a capacitor C313, the other end of the capacitor C313 is connected to the first RFX2401C chip, and the other end of the capacitor C313 is further grounded through a second harmonic filter capacitor C314. The inductor L300, the inductor L301, the inductor L302, the capacitor C320 and the capacitor C313 form a balun circuit together, so that current flowing into the outer part of a cable shielding layer is restrained, and the radiation range of the antenna is ensured.
And the 6 th pin of the nRF24L01 chip is connected with a common I/O port of the central processing unit through a current limiting resistor R313 for controlling an interrupt input of the nRF24L01 chip, and the 6 th pin of the nRF24L01 chip is also connected with 3.3V (i.e., VA3V3 shown in the figure) through a pull-up resistor R380. Pin 7 of nRF24L01 chip is connected to 3.3V and to ground through three parallel filter capacitors C316, C317, C318. The 8 th pin of the nRF24L01 chip is grounded, a crystal oscillator circuit is connected between the 9 th pin and the 10 th pin of the nRF24L01 chip, the crystal oscillator circuit comprises a 16M passive crystal oscillator Y300 connected between the 9 th pin and the 10 th pin of the nRF24L01 chip, a resistor R318 is connected in parallel with the 16M passive crystal oscillator Y300, two ends of the resistor R318 are grounded through a crystal oscillator load capacitor C322 and a crystal oscillator load capacitor C323 respectively, the Q value of the crystal is reduced through the arrangement of the resistor R318, and the crystal oscillation starting probability is improved.
The 14 th pin of the nRF24L01 chip is grounded, the 15 th pin of the nRF24L01 chip is connected with the 18 th pin of the nRF24L01 chip, the 18 th pin of the nRF24L01 chip is connected with 3.3V, and meanwhile, the nRF24L01 chip is grounded through filter capacitors C302, C303, C304 and C305 which are connected in parallel, so that the power supply stability is improved. The 16 th pin of the nRF24L01 chip is grounded through a pull-down resistor R306, the 19 th pin of the nRF24L01 chip is grounded through a filter capacitor C308, and the 17 th, 20 th and 21 th pins of the nRF24L01 chip are grounded.
As shown in fig. 4, the 4 th pin of the first RFX2401C chip is connected to the other end of the capacitor C313 connected to the nRF24L01 chip through a dc blocking capacitor C1677, the 10 th pin of the first RFX2401C chip is connected to an SMA contact J303 through a dc blocking capacitor C315, and the SMA contact J303 is connected to the antenna of the 2.4G data receiving module. The first RFX2401C chip is configured in a low noise amplification mode.
The 1 st, 2 nd, 3 rd, 7 th, 8 th, 9 th, 11 th, 12 th and 15 th pins of the first RFX2401C chip are grounded, the 5 th pin is grounded through a pull-down resistor R315, the 6 th pin is connected with 3.3V through a pull-up resistor R316, the 14 th pin is connected with 3.3V through a pull-up resistor R307, one end of the pull-up resistor R307 connected with the 3.3V is also connected with the 17 th pin through filter capacitors C309, C310, C306, C311 and C312 which are connected in parallel, and the 17 th pin is grounded.
In this embodiment, the microcontroller with the bluetooth function in the bluetooth beacon broadcast packet sending module is an NRF52832 chip, and the second radio frequency processing module of the bluetooth beacon broadcast packet sending module includes a second RFX2401C chip.
As shown in fig. 5, the NRF52832 chip is connected to the central processing unit through a serial communication interface, the serial communication interface of the NRF52832 chip includes 11 th, 14 th and 16 th pins, wherein the 11 th and 16 th pins are transmission ports, the 14 th pin is a reception port, and the 14 th pin is matched with one of the 11 th and 16 th pins to communicate with the central processing unit. In order to improve the emergency capability of the circuit, the embodiment provides two sending ports for the need of time and convenience for the function expansion of the circuit.
It is easy to understand that, under the condition of not influencing the use of the IO ports of the chip, the number of the sending ports and the receiving ports can be adjusted correspondingly.
For the NRF52832 chip, the 1 st pin is grounded through a filter capacitor C352, a crystal oscillator circuit is connected between the 2 nd pin and the 3 rd pin, the crystal oscillator circuit comprises a crystal oscillator Y303, a capacitor C353 and a capacitor C366, the crystal oscillator Y303 is connected between the 2 nd pin and the 3 rd pin, meanwhile, the two ends of the crystal oscillator Y303 are grounded through the capacitor C353 and the capacitor C366, the crystal oscillator Y303 is a passive crystal oscillator of 32.768KHz, and the C353 and the C366 are crystal oscillator load capacitors and provide a low-speed clock for the Bluetooth chip.
The 13 th pin of the NRF52832 chip is connected with 3.3V and is grounded through the series-connected filter capacitors C374, C375 and C376, so that the power supply stability is improved. The 24 th pin is connected with 3.3V through a pull-up resistor R350, grounded through a filter capacitor C372 and connected with the central processing unit through a current limiting resistor R352, and is used for controlling the NRF52832 chip to reset by the central processing unit. The 25 th and 26 th pins are connected with a program downloading circuit for loading a logic program into the NRF52832 chip. The program downloading circuit in this embodiment includes a program downloading interface J305, a 1 st pin of the program downloading interface J305 is grounded, a 2 nd pin of the program downloading interface J305 is connected to a 25 th pin of the NRF52832 chip through a current limiting resistor R357, a3 rd pin of the program downloading interface J305 is connected to a 26 th pin of the NRF52832 chip through a current limiting resistor R356, and a 4 th pin of the program downloading interface J305 is connected to 3.3V and grounded through a filter capacitor C373.
The 30 th pin of the NRF52832 chip is connected with the second RFX2401C chip through an impedance matching circuit, the impedance matching circuit includes a capacitor C370 and an inductor L306, one end of the capacitor C370 is connected with the 30 th pin of the NRF52832 chip, one end of the capacitor C370 is grounded, one end of the inductor L306 is connected with the 30 th pin of the NRF52832 chip, and the other end of the inductor L306 is connected with the second RFX2401C chip.
For an NRF52832 chip, a 31 th pin is grounded, a 32 th pin is grounded through a filter capacitor C369, a 33 th pin is grounded through a filter capacitor C368, a crystal oscillator circuit is connected between 34 th pins and 35 th pins, the crystal oscillator circuit comprises a crystal oscillator Y304, a capacitor C354 and a capacitor C367, the crystal oscillator Y304 is connected between the 34 th pin and the 35 th pin, two ends of the crystal oscillator Y304 are grounded through the capacitor C354 and the capacitor C367 respectively, wherein Y304 is a 16MHz passive crystal oscillator, and C354 and C367 are crystal oscillator load capacitors and provide a high-speed clock for a Bluetooth chip.
The 36 th pin of the NRF52832 chip is connected with 3.3V and is grounded through the filter capacitors C350 and C351 which are connected in parallel, so that the power supply stability is improved. The 37 th pin is grounded through a filter capacitor C348, the 38 th pin is grounded through a filter capacitor C344, the 42 th and 43 th pins are respectively connected with a current-limiting resistor R344 and R343 and then serve as standby ports for controlling the second RFX2401C chip, the 45 th and 49 th pins are grounded, the 46 th pin is grounded through the filter capacitor C343, the 47 th pin is grounded through an inductor L305 and an energy storage inductor L304, the energy storage inductor L304 releases electric energy under the condition that the power supply is disconnected, so that the NRF52832 chip can be protected from instant high-voltage impact generated by suddenly disconnecting the power supply, the service life of the chip is prolonged, the 48 th pin is connected with 3.3V and is grounded through the filter capacitors C345, C346, C347 and C349 which are connected in series, and the power supply stability is improved.
As shown in fig. 6, the 4 th pin of the second RFX2401C chip is connected to the other end of the inductor L306 connected to the NRF52832 chip through a dc blocking capacitor C341, the 10 th pin of the second RFX2401C chip is connected to an SMA connector J304 through a dc blocking capacitor C338, and the SMA connector J304 is connected to an antenna of the bluetooth beacon broadcast packet transmitting module. The second RFX2401C chip is configured in PA mode.
The 1 st, 2 nd, 3 rd, 7 th, 8 th, 9 th, 11 th, 12 th and 15 th pins of the second RFX2401C chip are grounded, the 5 th pin is connected with 3.3V through a pull-up resistor R333, the 6 th pin is connected with the ground through a pull-down resistor R340, the 14 th pin is connected with 3.3V through a pull-up resistor R330, one end of the pull-up resistor R330 connected with the 3.3V is also connected with the 17 th pin through filter capacitors C329, C331, C332, C333 and C334 which are connected in parallel, and the 17 th pin is grounded.
In order to switch the operating mode of the second RFX2401C chip conveniently to improve the applicability and functional expansibility of the device, pins 5 and 6 of the second RFX2401C chip may be connected to pins 42 and 43 of the NRF52832 chip instead of ground or 3.3V, and the operating mode of the second RFX2401C chip is directly controlled by the NRF52832 chip.
It should be noted that, in this embodiment, the specification of each resistor, capacitor and inductor may be adjusted according to an actual design requirement of the dual-mode communication base station, for example, adjusted according to a radiation range, a power supply stability requirement, and the like, and one of the specifications used in this embodiment is shown in the drawing.
In the circuit structure among the 2.4G communication unit that this embodiment provided, it is stable to have preferred, and expansibility is strong, and the moderate chip of economic cost is as preferred chip, through the circuit layout to the chip, effectively improve the stability of chip work, obtain suitable 2.4G signal receiving and dispatching scope and the stable frequency of sending of bluetooth beacon broadcast, satisfy the nimble demand of switching communication mode between and the mobile terminal of bimodulus communication basic station, established reliable hardware basis for bimodulus communication basic station.
The LoRa communication unit in the dual-mode communication base station comprises a LoRa gateway connected with a central processing unit, and an antenna connected with the LoRa gateway and is responsible for information data sent by the mobile terminal through the LoRa. In this embodiment, an existing gateway is used as the LoRa gateway, and the antenna may be designed to be integrated with the LoRa gateway or to be separated from the LoRa gateway.
In this embodiment, the power supply unit includes a POE power module and a DCDC module. The POE power module is used for acquiring power from a POE switch or equipment with POE power supply and outputting 5V voltage to the DCDC module; and the DCDC module is used for converting the 5V voltage input by the POE power supply module into 3.3V voltage to supply power to the central processing unit, the 2.4G communication unit, the LoRa communication unit and the Ethernet circuit.
The power supply unit that adopts in this embodiment utilizes POE power module to reduce the power and acquires the degree of difficulty, reduces the restriction that the basic station selected the position to convert out 3.3V voltage through the DCDC module, improved stability and reliability for central processing unit, 2.4G communication unit, loRa communication unit and ethernet unit power supply.
The Ethernet unit in this embodiment includes Ethernet circuit and RJ45 interface, and wherein the Ethernet circuit adopts hundred million network standards to carry out circuit design, is responsible for in the information data that will collect sends the switch to the public network through RJ45 interface connection, when the Ethernet circuit based on communication chip builds carries out circuit design, its communication chip preferably is LAN8720A chip.
The central processing unit in this embodiment includes a crystal oscillator circuit module, a reset circuit module, a mode selection module, an interface circuit, and the like, all of which are conventional modules carried by the central processing unit, and no specific description is given in this embodiment, and the central processing unit may select a corresponding chip according to an actual use requirement, for example, the central processing unit in this embodiment preferably employs an STM32F407 series chip.
The central processing unit works with three cores: (1) Reading information data received by the wireless transceiver chip through the SPI bus; (2) Reading information data received by the LoRa gateway through a serial bus; (3) And information data is packaged and transmitted to the public network through the RMII bus.
As shown in fig. 7, the main workflow of the central processing unit is as follows.
Step 1: and system initialization, including GPIO initialization, system clock setting, interrupt vector initialization, serial port initialization, SPI initialization and the like.
Step 2: and setting Ethernet parameters, including initialization of LWIP protocol, setting of memory size, resetting of PHY chip and the like.
And step 3: a TCP connection is created.
And 4, step 4: and opening a serial port receiving interrupt and an SPI receiving interrupt.
And 5: judging whether the 100ms delay time arrives, and jumping to the step 6 if the 100ms delay time arrives; otherwise, the system is always in waiting state;
step 6: judging whether the data area T to be sent is empty, if the data area T to be sent is empty, indicating that no data needs to be sent, not starting Ethernet for sending, and jumping to the step 5; otherwise step 7 is performed.
And 7: and starting Ethernet transmission, transmitting the data area T, and jumping to the step 5 after the transmission is finished.
As shown in fig. 8, the specific steps of the serial port interrupt service receiving subroutine in the main workflow are as follows:
step 1: the interrupt is turned off.
Step 2: and judging whether the received data is a positioning data frame, if so, jumping to the step 3, otherwise, jumping to the step 6.
And step 3: continuously receiving data and storing the data into the temporary buffer area B.
And 4, step 4: whether the receiving is completed or not is judged, and the positioning data per frame is 32 bytes in fixed length, so that 32 continuous receiving indicates that the receiving is completed. And jumping to step 5 if the reception is completed, otherwise, continuing the reception.
And 5: and writing the data cache region B into a data region T to be transmitted.
Step 6: and opening the interrupt, and ending the interrupt service subprogram.
As shown in fig. 9, the specific steps of the SPI reception interrupt service routine in the main workflow are as follows:
step 1: the interrupt is turned off.
Step 2: and judging whether the received data is a positioning data frame, if so, jumping to the step 3, otherwise, jumping to the step 6.
And 3, step 3: continuously receiving data and storing the data into the temporary buffer area C.
And 4, step 4: whether the reception is completed or not is judged, and the positioning data per frame is of a fixed length of 32 bytes, so that the continuous reception of 32 indicates that the reception is completed. And if the receiving is completed, jumping to the step 5, otherwise, continuously receiving.
And 5: and writing the data cache region C into a data region T to be transmitted.
Step 6: and opening the interrupt, and ending the interrupt service subprogram.
The central processing unit of this embodiment receives and processes the information data sent by the 2.4G communication unit and the LoRa communication unit, thereby effectively widening the range of information data reception and avoiding the problem of uneven distribution of the information data sending end. And the detailed steps not mentioned in the data receiving flow of the central processing unit of the present embodiment can be implemented based on the existing logic.
In another embodiment, as shown in fig. 10, a bluetooth positioning system is also provided, which comprises a beacon, a tag, a server, and a dual-mode communication base station. The dual-mode communication base station is the dual-mode communication base station described in any of the above embodiments, and the tag is used as a mobile terminal for performing information interaction with the dual-mode communication base station.
In order to meet the requirement of simultaneous far and near distance positioning, the labels in the embodiment comprise labels in a first range and labels in a second range. Further, a beacon communicating with a tag in the first range is defined as a beacon in the first range, and a beacon communicating with a tag in the second range is defined as a beacon in the second range.
The tags in the first range carry out information data transmission with the 2.4G communication unit of the dual-mode communication base station; and the tags in the second range carry out information data transmission with the LoRa communication unit of the dual-mode communication base station.
Effectively satisfy the demand of bluetooth location through 2.4G communication unit and loRa communication unit, reduce the basic station and lay degree of difficulty and cost.
It should be noted that the range to which the tag belongs is not fixed, that is, the tag may be adjusted and updated in real time, so as to improve the applicable scenario of the bluetooth positioning system of this embodiment. The embodiment provides a method for determining a range to which a tag belongs, which comprises the following steps:
the 2.4G communication unit in the dual-mode communication base station comprises a Bluetooth beacon broadcast packet sending module, and the Bluetooth beacon broadcast packet sending module sends beacon broadcast packets outwards at regular time. The label regularly scans the beacon broadcast packet sent by the Bluetooth beacon broadcast packet sending module, and if the beacon broadcast packet is scanned, the label is in a first range; otherwise, it is a tag in the second range.
In the bluetooth positioning system of this embodiment, the beacon broadcasts the beacon broadcast packet to the outside at a fixed frequency of 2 Hz. The actual physical position needs to be recorded in actual use, and the beacon transmission power needs to be modified and adjusted in position according to the actual positioning effect.
The label opens the scanning mode according to 3.3Hz fixed frequency, and scanning duration operating time does not exceed 150ms, screens the beacon broadcast package that scans, keeps the beacon broadcast package that the signal is strong to judge whether scan the beacon broadcast package of dual mode communication base station in the screening, if scan and use 2.4G link upload data, if do not then use Lora to upload data.
The dual-mode base station broadcasts beacon broadcast packets outwards according to the fixed frequency of 10Hz, and simultaneously monitors the 2.4G data link and the LoRa data link continuously, and the beacon broadcast packets can be processed immediately as long as data exist. And then starting an Ethernet transmission data instruction at a fixed frequency of 10Hz, and sending all the received data sets to the switch.
The switch forwards the data received from the base station to the server, and the server extracts, calculates and outputs the positioning coordinates of the data transmitted by the base station and displays the positioning coordinates on a front-end page.
The bluetooth positioning system in this embodiment is realized based on the dual-mode communication base station, and can satisfy the positioning that closely and concurrency are big and far-range and concurrency are little to the equipment of entire system lays the degree of difficulty and with low costs, easily uses widely.
In this application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number, order of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (9)

1. A dual-mode communication base station is used for information transfer with a mobile terminal, and is characterized by comprising a central processing unit, a 2.4G communication unit, a LoRa communication unit, an Ethernet unit and a power supply unit;
the 2.4G communication unit is used for receiving information data transmitted by the mobile terminal in the first range and sending the information data to the central processing unit;
the LoRa communication unit is used for receiving information data transferred by mobile terminals in a second range and sending the information data to the central processing unit, and the second range is farther away from the dual-mode communication base station than the first range;
the central processing unit is used for receiving the information data sent by the 2.4G communication unit and the LoRa communication unit and issuing an uploading instruction to the Ethernet unit;
the Ethernet unit is used for receiving an uploading instruction sent by the central processing unit and uploading information data received by the central processing unit to a public network;
the power supply unit is used for supplying power to the central processing unit, the 2.4G communication unit, the LoRa communication unit and the Ethernet unit;
the 2.4G communication unit comprises a 2.4G data receiving module and a Bluetooth beacon broadcast packet sending module;
the 2.4G data receiving module comprises a wireless transceiving chip connected with the central processing unit, a first radio frequency processing module connected with the wireless transceiving chip and an antenna connected with the first radio frequency processing module;
the Bluetooth beacon broadcast packet sending module comprises a microcontroller with a Bluetooth function, a second radio frequency processing module and an antenna, wherein the microcontroller is connected with the central processing unit and is internally provided with the Bluetooth function, the second radio frequency processing module is connected with the microcontroller with the Bluetooth function, and the antenna is connected with the second radio frequency processing module; the Bluetooth beacon broadcast packet sending module sends beacon broadcast packets outwards at regular time, the mobile terminal scans the beacon broadcast packets sent by the Bluetooth beacon broadcast packet sending module at regular time, and if the beacon broadcast packets are scanned, the mobile terminal is in a first range; otherwise, the mobile terminal is in the second range;
the central processing unit receives the information data sent by the 2.4G communication unit and the LoRa communication unit, issues an uploading instruction to the Ethernet unit, and executes the following operations:
step 1: initializing a system, including GPIO initialization, system clock setting, interrupt vector initialization, serial port initialization and SPI initialization;
step 2: setting Ethernet parameters, including initializing LWIP protocol, setting memory size, and resetting PHY chip;
and step 3: creating a TCP connection;
and 4, step 4: opening a serial port receiving interrupt and an SPI receiving interrupt;
and 5: judging whether the 100ms delay time arrives, and jumping to the step 6 if the 100ms delay time arrives; otherwise, the mobile terminal is always waiting;
and 6: judging whether the data area T to be sent is empty, if the data area T to be sent is empty, indicating that no data needs to be sent, not starting Ethernet for sending, and jumping to the step 5; otherwise, executing step 7;
and 7: and starting Ethernet transmission, transmitting the data area T, and jumping to the step 5 after the transmission is finished.
2. The dual-mode communication base station of claim 1, wherein the wireless transceiver chip of the 2.4G data receiving module is an nRF24L01 chip, and the first rf processing module of the 2.4G data receiving module comprises a first RFX2401C chip;
the nRF24L01 chip is connected to the central processing unit through an SPI communication interface, the SPI communication interface of the nRF24L01 chip includes pins 1, 2, 3, 4, and 5, pin 11 of the nRF24L01 chip is connected to a filter capacitor C319, the other end of the filter capacitor C319 is grounded, pin 12 of the nRF24L01 chip is connected to an inductor L302, the other end of the inductor L302 is connected to pin 11 of the nRF24L01 chip and a capacitor C320, respectively, the other end of the capacitor C320 is grounded, pin 13 of the nRF24L01 chip is connected to an inductor L301, the other end of the inductor L301 is connected to pin 12 of the nRF24L01 chip, pin 13 of the nRF24L01 chip is also connected to an inductor L300, the other end of the inductor L300 is connected to a capacitor C313, the other end of the capacitor C313 is connected to the first RFX2401C chip, and the other end of the capacitor C313 is also grounded through a second harmonic filter capacitor C314.
3. The dual-mode communication base station of claim 2, wherein a 4 th pin of the first RFX2401C chip is connected to the other end of the capacitor C313 through a dc blocking capacitor C1677, a 10 th pin of the first RFX2401C chip is connected to an SMA contact J303 through a dc blocking capacitor C315, and the SMA contact J303 is connected to an antenna of a 2.4G data receiving module.
4. The dual-mode communication base station of claim 1, wherein the microcontroller with bluetooth function of the bluetooth beacon broadcast packet sending module is an NRF52832 chip, and the second rf processing module of the bluetooth beacon broadcast packet sending module includes a second RFX2401C chip;
the NRF52832 chip is connected with the central processing unit through a serial communication interface, the serial communication interface of the NRF52832 chip comprises 11 th, 14 th and 16 th pins, wherein the 11 th and 16 th pins are sending ports, the 14 th pin is a receiving port, and the 14 th pin is matched with one of the 11 th and 16 th pins to be connected and communicated with the central processing unit;
the 30 th pin of the NRF52832 chip is connected with the second RFX2401C chip through an impedance matching circuit, the impedance matching circuit includes a capacitor C370 and an inductor L306, one end of the capacitor C370 is connected with the 30 th pin of the NRF52832 chip, one end of the capacitor C370 is grounded, one end of the inductor L306 is connected with the 30 th pin of the NRF52832 chip, and the other end of the inductor L306 is connected with the second RFX2401C chip.
5. The dual-mode communication base station of claim 1, wherein the LoRa communication unit includes an LoRa gateway coupled to the central processing unit, and an antenna coupled to the LoRa gateway.
6. The dual-mode communication base station of claim 1, wherein the power supply unit comprises a POE power module and a DCDC module;
the POE power module is used for acquiring power from a POE switch or equipment with POE power supply and outputting 5V voltage to the DCDC module;
the DCDC module is used for converting 5V voltage input by the POE power module into 3.3V voltage, and the central processing unit, the 2.4G communication unit, the LoRa communication unit and the Ethernet unit supply power.
7. A Bluetooth positioning system, comprising a beacon, a tag, a server, and the dual-mode communication base station as claimed in any one of claims 1 to 6.
8. The bluetooth positioning system of claim 7, wherein the tags include tags within a first range and tags within a second range;
the label in the first range carries out information data transmission with a 2.4G communication unit of the dual-mode communication base station;
and the tags in the second range carry out information data transmission with the LoRa communication unit of the dual-mode communication base station.
9. The bluetooth positioning system according to claim 8, wherein the 2.4G communication unit comprises a bluetooth beacon broadcast packet transmitting module, and the bluetooth beacon broadcast packet transmitting module periodically transmits beacon broadcast packets outwards;
the label scans the beacon broadcast packet sent by the Bluetooth beacon broadcast packet sending module at regular time, and if the beacon broadcast packet is scanned, the label is in a first range; otherwise, it is a label in the second range.
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