High-precision positioning terminal based on Beidou short message data transmission

Abstract

A high-precision positioning terminal based on Beidou short message data transmission belongs to the field of communication, the terminal comprises a mounting seat, a supporting rod and a terminal main body, the terminal main body comprises a base and an upper shell, and a mainboard, a battery supporting plate, a battery, a battery fixing plate and a satellite antenna which are sequentially mounted on the base; the terminal is arranged in the sealing cover, so that perfect coexistence of multiple signals and maximum utilization efficiency of hardware resources are realized in a limited space; through effective isolation measures of multiple signals, coexistence of the signals is realized and the signals do not influence each other. According to the utility model, the capabilities of Beidou high-precision positioning, short message communication and the like are fully utilized, and the integration of displacement monitoring and data transmission is realized, so that possible dangerous cases are monitored, the monitoring precision and the monitoring efficiency are improved, and the reservoir risk early warning capability is effectively enhanced.

Description

Technical Field

[0001] The utility model belongs to the field of communication, in particular to a communication terminal based on a Beidou satellite navigation system, and specifically relates to a high-precision positioning terminal based on Beidou short message data transmission. Background Art

[0002] my country is the country with the most reservoir dams in the world, with 98,000 reservoirs. As an important public welfare project for disaster prevention and mitigation, solving water resource loss and supply-demand contradictions, dams play a very important role in maintaining social stability and ensuring sustainable social and economic development. However, since most of my country's reservoirs were built in the 1970s and 1980s, when my country's economic conditions were limited, various standards in the construction process were not strict enough, and the long-term operation of reservoir dams would gradually increase their potential safety hazards. Lack of stability, serious leakage, cracks and insufficient cross-sections are relatively common problems that have occurred in many reservoir dams in my country. Due to the lack of advanced supervision and observation facilities, it is difficult for management units to accurately judge the actual operation of the dam, and when problems occur, they cannot be discovered in time, making safety management very difficult.

[0003] In application scenarios such as dam displacement and settlement monitoring and landslide monitoring, a combination of displacement monitoring equipment and data transmission equipment is currently used, connected by cable harnesses. This has disadvantages such as complex system and low reliability, and the data transmission method is single and lacks flexibility.

[0004] The BeiDou Navigation Satellite System is a global satellite navigation system independently built and operated by China with an eye on national security and economic and social development needs. It is an important national space-time infrastructure that provides all-weather, all-day, high-precision positioning, navigation and timing services to users around the world. The BeiDou Navigation Satellite System and related technical equipment have good anti-interference capabilities, are autonomous and controllable, have low security risks, and are easy to operate and maintain.

[0005] Currently, there are many application terminals based on Beidou technology, but there are no terminal devices suitable for the above usage scenarios. Summary of the invention

[0006] The purpose of the utility model is to realize the integrated design of Beidou high-precision displacement monitoring and Beidou short message transmission, and to have the ability of long-term self-operation in remote areas.

[0007] In order to achieve the purpose of the invention, the utility model adopts the following technical solutions:

[0008] A high-precision positioning terminal based on Beidou short message data transmission includes a mounting seat, a support rod connected to the mounting seat and a terminal body connected to the support rod. The terminal body includes a base, an upper shell, a main board, a battery support plate, a battery, a battery fixing plate and a satellite antenna installed in sequence on the base.

[0009] 4-6 mounting posts with internal threads are arranged on the base, and the main board, battery support plate, battery fixing plate and satellite antenna are fixed on the mounting posts through isolation posts.

[0010] Furthermore, a waterproof breathable valve, a waterproof switch, a SIM card holder, and a connector are arranged on the base, and the waterproof switch and the connector are connected to the mainboard.

[0011] Furthermore, the main board is provided with an MCU, a Lora communication module connected to the MCU, an RTK positioning module, an RDSS communication module, a 4G communication module, a WiFi communication module, a 485 interface, a USB interface and a dual power switching circuit; the main board is also provided with a waterproof switch of the base, an external connector, a battery connection interface and an SMA interface for connecting the antennas of each communication and positioning module.

[0012] Furthermore, the battery is a rectangular parallelepiped or a cylinder, a limiting plate is arranged under the battery fixing plate, the shape formed by the limiting plate matches the outer contour of the battery, and the battery is connected to the mainboard through a cable; the SMA interface is arranged outside the battery coverage area, and a space for installing the antenna is formed between the upper shell, the battery support plate, the battery fixing plate and the battery.

[0013] Furthermore, the RDSS communication module adopts PCI-E packaging.

[0014] Furthermore, the base, the battery support plate and the battery fixing plate are made of metal materials.

[0015] Beneficial effects: The utility model integrates Beidou high-precision positioning, Beidou short message, 4G, Lora, WiFi and other functional modules, realizing the integration of displacement monitoring and data transmission. The terminal is placed inside the sealed cover, achieving the perfect coexistence of multiple signals and the maximum utilization efficiency of hardware resources in a limited space, achieving the design principle of "high performance, low power consumption, small size, industrial-grade products"; the mainboard is wrapped by a metal base and a battery support plate to form physical isolation; a rechargeable battery is fixed in the middle of the device, and 4G, Lora and WiFi antennas are placed on both sides of the battery, respectively, with a compact structure; the antenna is isolated by metal plates above and below to reduce interference with the communication and positioning signals on the upper part.

[0016] The utility model makes full use of Beidou's high-precision positioning and short message communication capabilities to monitor possible dangerous situations, improve monitoring accuracy and efficiency, and effectively enhance the reservoir risk warning capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the traditional solution schematic.

[0018] Figure 2 It is a structural schematic diagram of the utility model.

[0019] Figure 3 This is a schematic diagram of the device composition.

[0020] Figure 4-1 This is a schematic diagram of the structure under the base plate.

[0021] Figure 4-2 This is a schematic diagram of the structure on the bottom plate.

[0022] Figure 5 This is a schematic diagram of the motherboard.

[0023] Figure 6 This is a schematic diagram of the mainboard structure.

[0024] Figure 7 This is the schematic diagram of the dual power switching circuit.

[0025] Figure 8 It is a schematic diagram of the structure of the isolation column.

[0026] Fig. 9 This is a schematic diagram of the structure after the equipment is installed.

[0027] Fig.10 It is a solution principle diagram of applying the utility model.

[0028] Among them, 1: mounting seat, 2: supporting rod, 3: terminal body, 4: base, 4-1: mounting column, 4-2: ventilation valve, 4-3: waterproof switch, 4-4: SIM card holder, 4-4-1: SIM card cover, 4-4-2: SIM card cover waterproof ring, 4-5 external connector, 4-6: mounting through hole, 4-7: sealing ring groove, 4-8: indicator light, 5: upper shell, 6: main board, 6-1: battery holder, 6-2: external connector holder, 6-3: waterproof switch holder, 6-4: external connector position hole, 6-5: waterproof switch position hole, 7: battery support plate, 8: battery, 9: battery fixing plate, 9-1: limit plate, 10: satellite antenna, 11: sealing ring, 12: isolation column. DETAILED DESCRIPTION

[0029] Figure 1 A traditional solution for dam displacement and settlement monitoring and landslide monitoring is proposed, which uses a combination of displacement monitoring equipment and data transmission equipment, connected by cable harnesses. The system is complex and has low reliability.

[0030] See also Figure 2 The utility model proposes a high-precision positioning terminal based on Beidou short message data transmission, which includes a mounting base 1, a support rod 2 connected to the mounting base 1, and a terminal body 3 connected to the support rod 2. The mounting base 1 is used to fix the terminal on the ground.

[0031] See also Figure 3 The terminal body 3 includes a base 4, an upper shell 5, a main board 6, a battery support plate 7, a battery 8, a battery fixing plate 9 and a satellite antenna 10 installed in sequence on the base 4. The satellite antenna 10 includes an RTK antenna and an RDSS antenna. In this embodiment, the satellite antenna 10 adopts an RTK+RDSS combined antenna, and the RTK+RDSS combined antenna is fixed on the mounting plate.

[0032] The base 4 is used to install the entire device, and all external interfaces are arranged below it. The base 4 is circular, with 6-8 mounting through holes 4-6 arranged around the periphery, and threaded holes arranged at corresponding positions at the bottom of the upper shell 5; the base 4 is provided with a sealing ring groove 4-7, and a sealing ring 11 is arranged in the sealing ring groove 4-7. Figure 4-1 The externally visible parts include a vent valve 4-2, a waterproof switch 4-3, a SIM card holder 4-4, a connector 4-5, an indicator light 4-8 and a mounting through hole 4-6. The mounting through holes 4-6 can be set to 6-8, and 6 are set in this embodiment; the middle of the base 4 is a hole connected to the support rod 2. The position of the SIM card holder 4-4 corresponds to the position of the SIM card slot on the mainboard 6 (not shown in the figure).

[0033] See also Figure 4-2 , 4-6 mounting posts 4-1 with internal threads are arranged on the bottom plate, and 4 are arranged in this embodiment. The base 4 is made of metal material, is circular, and is surrounded by annular side plates, and a sealing ring groove 4-7 is arranged on the top of the side plate.

[0034] The main board 6 , the battery support plate 7 , the battery 8 , the battery fixing plate 9 and the RTK+RDSS combined antenna are fixed on the mounting column 4 - 1 through the isolation column 12 .

[0035] The functional components in the terminal are mainly integrated on the main board 6, see Figure 5 , the main board 6 is provided with an MCU, a Lora communication module connected to the MCU, an RTK positioning module, an RDSS communication module, a 4G communication module, a WiFi communication module, a 485 interface, a USB interface and a dual power switching circuit. Six status indicator lights are provided to indicate the status of power supply, RNSS, RDSS, 4G, Lora and WIFI respectively. Indicator lights 4-8 are provided on the base 4.

[0036] See also Figure 6The main board 6 is a double-layer or multi-layer PCB board. In the figure, 4G, RDSS, RTK, Lora, and WiFi represent 4G communication module, RDSS communication module, RTK positioning module, Lora communication module, and WiFi communication module respectively. 6-1 is a battery holder, which is connected to the battery 8 through a cable. 6-2 is an external connector holder, which is connected to the external connector 4-5 through a cable. 6-3 is a waterproof switch holder, which is connected to the waterproof switch 4-3 through a cable. 6-6-1~6-6-6 are SMA interfaces for connecting antennas of each communication and positioning module.

[0037] The main board 6, the battery support plate 7, the battery fixing plate 9, and the mounting plate of the RTK+RDSS combination antenna are provided with mounting through holes at positions corresponding to the mounting posts 4-1.

[0038] When installing the device, first place the mainboard 6 on the base 5 , align the mounting through holes of the mainboard 6 with the mounting posts 4 - 1 on the base 4 , and use the isolation posts 12 to fix them.

[0039] The RDSS communication module adopts PCI-E packaging, and a slot is set on the mainboard 6 for easy disassembly and assembly. If there is a good 4G signal on site, the RDSS module can be used to transmit short messages, saving equipment investment and use costs.

[0040] The structure of the isolation column 12 is as follows Figure 8 As shown, its cross section is circular or regular hexagonal, with threads on the top and a threaded hole on the bottom. Its length is selected according to the needs of the equipment.

[0041] A waterproof switch 4-3 and an external connector 4-5 are installed on the base 4, and a waterproof switch position hole 6-5 and an external connector position hole 6-4 are set on the main board. The waterproof switch 4-3 and the external connector 4-5 reach the main board 6 through the corresponding position holes.

[0042] Connect the waterproof switch 4 - 3 and the waterproof switch base 6 - 3 with a cable.

[0043] The external connector 4-5 is used to connect the external power supply VCC and provide a 485 interface.

[0044] Place the battery support plate 7 on the main board 6, align it with the mounting through hole, and fix it with the isolation column 12. The height of the isolation column 12 is consistent with the height of the battery 8. The battery support plate 7 corresponds to the shape of the main board 6, and a hole is opened at the position corresponding to the SMA interface, and a notch is set on one side. The position of the notch corresponds to the position of the external connector position hole 6-4 of the main board 6, the battery seat 6-1 and the external connector seat 6-2, which is convenient for cable connection.

[0045] The battery support plate 7 and the base 4 are both made of metal materials, which form a physical isolation for the main board 6 and reduce interference with the communication and positioning signals on the upper part.

[0046] Install the column antennas of the Lora communication module, 4G communication module, and WiFi communication module on the corresponding SMA interfaces 6-6-2, 6-6-1, and 6-6-3, respectively.

[0047] The battery 8 is placed on the battery support plate 7. The battery 8 is a rectangular parallelepiped or cylindrical shape. In this embodiment, a rectangular parallelepiped battery is selected. A limiting plate 9-1 is arranged below the battery fixing plate 9. The shape of the limiting plate 9-1 matches the outer contour of the battery 8. The battery fixing plate 9 is also provided with a through hole.

[0048] The battery fixing plate 9 is placed on the battery 8, and the shape formed by the limit plate 9-1 is aligned with the battery 8 and the mounting through hole, and fixed with the isolation column 12. Since the SMA interface is set outside the coverage area of ​​the battery 8, the installation of the battery 8 will not be affected. The antennas of the Lora communication module and the WiFi communication module are adjacent, and the antenna of the 4G communication module is on the other side of the battery 8.

[0049] The upper shell 5, the battery support plate 7, the battery fixing plate 9 and the battery 8 form a space for installing the antenna. The battery support plate 7 and the battery fixing plate 9 are made of metal materials, which can effectively isolate the wireless signal and reduce the impact on the satellite signal. At the same time, the battery 8 can also play a certain isolation role.

[0050] The battery 8 is connected to the battery holder 6 - 1 through a cable, and the external connector 4 - 5 is connected to the external connector holder 6 - 2 through a cable.

[0051] Pass the connection cable of the RTK+RDSS combination antenna through the through hole on the battery fixing plate 9; place the RTK+RDSS combination antenna on the battery fixing plate 9, align it with the installation through hole, and fix it with screws. Connect the connection cable to the SMA interfaces 6-6-4, 6-6-5, and 6-6-6 corresponding to the RTK+RDSS combination antenna.

[0052] The RTK+RDSS combined antenna is built into the top of the device to ensure the best performance of positioning signals and short message signals.

[0053] The RTK+RDSS combination antenna is a full-system multi-frequency high-precision RTK and RDSS combination active antenna, covering all frequency bands including Beidou and GPS as well as L (LF0-LF4) / S band. The antenna pattern has a wide beam and high isolation, and can be used with Beidou terminals to achieve centimeter-level positioning and short message transmission functions.

[0054] The RTK+RDSS combination antenna combines real-time dynamic differential (RTK) technology with satellite differential positioning system (RDSS) technology, using RTK technology to obtain centimeter-level accurate location information, and using RDSS technology to provide a wider coverage area and more stable positioning services for high-precision positioning, thus achieving dam displacement, settlement and landslide monitoring.

[0055] RTK technology can provide centimeter-level positioning accuracy, and RDSS technology can make up for the shortcomings of RTK in obstructed environments.

[0056] At this time, the device Fig. 9 shown.

[0057] Place the waterproof sealing ring 11 in the sealing ring groove 4-7, place the upper shell 5 on the base 4, and use screws to pass through the installation through holes 4-6 to fix them in the threaded holes set at the corresponding positions on the bottom of the upper shell 5.

[0058] Install the SIM card into the SIM card slot of the mainboard (indicated in the figure), and fix the SIM card cover waterproof ring 4-4-2 and the SIM card cover plate 4-4-1 on the base 4.

[0059] The above process completes the installation of the terminal body 3. When in use, the terminal body 3 is connected to the mounting base 1 through the connecting support rod 2.

[0060] The dual power switching circuit is arranged on the main board 6 to process the charging and discharging of the battery 8 and the switching between the external power supply and the battery power supply. Figure 7 The dual power switching circuit includes a diode D5 connecting an external power supply VCC and a power output VOUT, a battery output VBAT connected to a diode D6 and a D end of a PMOS tube Q7, an S end of the PMOS tube Q7 and the other end of the diode D6 connected to the power output VOUT, and an external power supply VCC is also connected to a G end of the PMOS tube Q7 through a resistor R60, and is connected to the ground through a parallel resistor R61 and a capacitor C72.

[0061] When there is power input at the external power supply VCC, the current can directly pass through the diode D5 and flow to VOUT; at this time, because VCC also pulls up the gate of the PMOS tube Q7, the difference between the gate voltage and the source voltage is very small, and the Q7 tube will be cut off to prevent the current from VOUT from flowing to VCC. In this way, when there is power from the external power supply VCC, VOUT is powered, and the VBAT battery is charged through the charging chip.

[0062] When the external power supply VCC is disconnected and there is no power input, the gate of MOS tube Q7 is pulled down to the bottom. At this time, since VBAT is connected to the battery, the source and gate of Q7 have a voltage of more than 3V, Q7 will be turned on, and the battery VBAT can supply power to VOUT.

[0063] In the figure, D5 and D6 are high-current Schottky diodes. Because Schottky diodes have a small voltage drop and a fast switching rate, they can make up for the shortcomings of slow MOS tube switching. If the external power supply is withdrawn and Q7 is not fully turned on, VOUT will drop for a short time. At this time, the current can pass through the high-speed diode D6. When Q7 is fully turned on, the voltage drop from VBAT to VOUT can be very small.

[0064] When there is external power supply, the device is powered by the external power supply and charges the battery at the same time. When the external power is disconnected, the dual power switching circuit automatically switches to battery power supply to maintain continuous operation of the device.

[0065] The terminal consists of a Linux core unit (MCU), Lora communication module, 4G communication module, RNSS positioning module, RDSS communication module, dual power switching circuit, status indicator light, power button, 485 communication interface, USB debugging port, etc. The Linux core unit is used to run Linux programs to process high-precision location data acquisition, task processing and data output, etc. The dual power switching circuit uses a power chip with a wide voltage input to ensure stable power output of each unit of the circuit, while managing the charging and discharging of the built-in battery to achieve uninterrupted switching between external power and battery; the external connector is used to realize the external interface of the device, mainly to realize external power supply and 1-way 485 data transmission; the indicator unit is used to indicate the mainboard power supply and the working status of each module.

[0066] The whole machine adopts a waterproof and dustproof structure with a sealing ring, and the whole machine meets the IP67 standard requirements. All connections are sealed and fastened with screws + sealing rings; the peripheral interface adopts a waterproof plug interface, and the SIM card slot cover is equipped with a sealing ring to ensure the protection requirements of the device interface.

[0067] Through the built-in WiFi communication module of the module, it is convenient to configure it into base station or monitoring station mode using the mobile web.

[0068] The device has built-in 4G communication module and RDSS module, which can realize multiple options for data upload. The RDSS module adopts PCI-E package and can be freely installed according to the requirements of the usage scenario.

[0069] Support connecting data acquisition sensors via RS485 to obtain sensor data.

[0070] Fig.10 A solution principle diagram implemented by applying the utility model is given.

[0071] Beidou short message communication is short message communication between Beidou short message terminals using Beidou RDSS, i.e. satellite radio determination service. It has all-weather and all-day short message communication capabilities. The data input and output of Beidou short message terminals comply with corresponding industry standards and specifications.

[0072] The positioning terminal uses Beidou short message communication technology, high-precision positioning technology, mobile communication and other technical means to realize the monitoring, early warning and alarm of geological disasters such as landslides and collapses. The positioning terminal is responsible for sending the displacement and other data of the monitoring point to the back-end monitoring platform. In the case of mobile communication network, mobile communication is used first for the transmission and reception of monitoring data; in areas without mobile ground network coverage, Beidou short messages are used for data transmission.

[0073] The positioning terminal realizes the integrated design of Beidou high-precision displacement monitoring and Beidou short message transmission, and has the ability to operate independently for a long time in remote areas; the terminal configures the device parameters through WiFi, and can be easily configured as a base station or monitoring station for flexible reuse. It supports high-precision differential data transmission based on Lora networking between the base station and the monitoring station, and supports sending differential data information to the monitoring station through Beidou short messages to carry out high-precision positioning solution mode. High-precision displacement data can be intelligently transmitted to the management background through Beidou short messages or 4G networks. The device has a built-in large-capacity battery and has the ability to continue to operate for a period of time after power failure.

Claims

1. A high-precision positioning terminal based on Beidou short message data transmission, comprising a mounting seat (1), a support rod (2) connected to the mounting seat (1), and a terminal body (3) connected to the support rod (2), characterized in that: The terminal body (3) comprises a base (4), an upper shell (5), a main board (6) installed in sequence on the base (4), a battery support plate (7), a battery (8), a battery fixing plate (9) and a satellite antenna (10); The base (4) is provided with 4 to 6 mounting columns (4-1) with internal threads, and the main board (6), the battery support plate (7), the battery fixing plate (9) and the satellite antenna (10) are fixed on the mounting columns (4-1) via isolation columns (12).

2. The terminal according to claim 1, characterized in that The base (4) is provided with a waterproof breathable valve (4-2), a waterproof switch (4-3), a SIM card holder (4-4), and an external connector (4-5); the waterproof switch (4-3) and the external connector (4-5) are connected to a mainboard (6).

3. The terminal according to claim 1, characterized in that: The main board (6) is provided with an MCU, a Lora communication module connected to the MCU, an RTK positioning module, an RDSS communication module, a 4G communication module, a WiFi communication module, a 485 interface, a USB interface and a dual power supply switching circuit. The main board (6) is also provided with connection interfaces with a waterproof switch (4-3), an external connector (4-5) and a battery (8), and an SMA interface connected to the communication module and the positioning module antenna.

4. The terminal according to claim 3, characterized in that: The battery (8) is a rectangular parallelepiped or a cylinder; a limiting plate (9-1) is arranged below the battery fixing plate (9); the shape formed by the limiting plate (9-1) matches the outer contour of the battery (8); the battery (8) is connected to the mainboard (6) via a cable; the SMA interface is arranged outside the coverage area of ​​the battery (8); and a space for installing an antenna is formed between the upper shell (5), the battery support plate (7), the battery fixing plate (9) and the battery (8).

5. The terminal according to claim 4, characterized in that: The Lora communication module, the 4G communication module and the WiFi communication module use a cylindrical antenna, and the cylindrical antenna is connected to the corresponding SMA interface of the mainboard (6).

6. The terminal according to claim 4, characterized in that: The satellite antenna (10) comprises an RTK antenna and an RDSS antenna, and the satellite antenna (10) is connected to a corresponding SMA interface of the mainboard (6) via a cable.

7. The terminal according to claim 3, characterized in that: The RDSS communication module adopts PCI-E packaging.

8. The terminal according to claim 1, characterized in that: The base (4), the battery support plate (7) and the battery fixing plate (9) are made of metal material.

9. The terminal according to claim 1, characterized in that: The base (4) is circular, with 6 to 8 mounting through holes (4-6) arranged around its periphery, and threaded holes arranged at corresponding positions on the bottom of the upper shell (5); the base (4) is provided with a sealing ring groove (4-7), and a sealing ring (11) is arranged in the sealing ring groove (4-7).

10. The terminal according to claim 3, characterized in that: The dual power switching circuit processes the charging and discharging of the battery (8) and the switching between external power and battery power supply. The dual power switching circuit includes a diode D5 connected to the external power supply VCC and the power supply output VOUT, the battery output VBAT is connected to the diode D6 and the D end of the PMOS tube Q7, the S end of the PMOS tube Q7 and the other end of the diode D6 are connected to the power supply output VOUT, and the external power supply VCC is also connected to the G end of the PMOS tube Q7 through a resistor R60, and is connected to the ground through a parallel resistor R61 and a capacitor C72.

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