CN113687389B - Integrated GNSS receiver suitable for field disaster monitoring - Google Patents
Integrated GNSS receiver suitable for field disaster monitoring Download PDFInfo
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- CN113687389B CN113687389B CN202010418271.4A CN202010418271A CN113687389B CN 113687389 B CN113687389 B CN 113687389B CN 202010418271 A CN202010418271 A CN 202010418271A CN 113687389 B CN113687389 B CN 113687389B
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/14—Receivers specially adapted for specific applications
- G01S19/17—Emergency applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/32—Multimode operation in a single same satellite system, e.g. GPS L1/L2
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/36—Constructional details or hardware or software details of the signal processing chain relating to the receiver frond end
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an integrated GNSS receiver suitable for field disaster monitoring, which comprises an upper cover and a lower cover, wherein a PCB circuit board is arranged on the lower cover, the upper cover is arranged on the lower cover and covers the PCB circuit board, a GNSS antenna is arranged in an upper cavity of the upper cover, a microprocessor module, a power management module, a solar charging control module, a GNSS board card and the like are integrated on the top layer of the PCB circuit board, a wireless communication module is integrated on the bottom layer of the PCB circuit board, and an antenna of the wireless communication module is arranged outside the lower cover. The invention simplifies the structure of the receiver, reduces the installation and design cost, improves the reliability and maintainability of the product, and simultaneously sets the GNSS board card, the GNSS antenna, the wireless communication module and the solar charging control module in different shielding cavities to improve the electromagnetic shielding effect.
Description
Technical Field
The invention belongs to the technical field of satellite receiver radio frequency, and particularly relates to a circuit composition, layout and electromagnetic shielding design of an integrated GNSS receiver suitable for field disaster monitoring.
Background
As a main instrument for monitoring earth surface displacement, GNSS receivers have been increasing year by year in the field of geological disaster deformation monitoring. In the face of various adverse conditions of field disaster monitoring, the GNSS receiver needs to be optimized in terms of structure, electricity and software, and the electricity is used as a hard core of the structure and the software, and only if the electrical design is reasonable, the design of the structure and the software is soul supported. The existing GNSS receivers for monitoring the deformation of geological disasters mostly adopt modularized architecture design, main components of a solar charging controller module, a 4G module and the GNSS receivers are placed in an electric control cabinet after being connected in a wired mode through cables, and GNSS antennas are placed at the top of a vertical rod, so that a GNSS receiver monitoring unit with an independent function is finally formed. The monitoring unit has the characteristics of flexible field configuration and convenient networking, but has low reliability, high cost, large power consumption and complex installation.
Disclosure of Invention
The invention aims to provide an integrated GNSS receiver suitable for field disaster monitoring, which adopts an integrated design framework, completes each functional module of a split receiver by a simplified integrated circuit, optimizes the circuit composition and layout of the split receiver, solves the problems of electromagnetic and signal interference, testing, transportation, maintenance and the like of products, simplifies the structure of the products on the premise of meeting the monitoring function and performance requirements, reduces the power consumption and cost of the products, and improves the reliability and maintainability of the products.
In order to achieve the above purpose, the invention provides an integrated GNSS receiver suitable for field disaster monitoring, which comprises an upper cover with an upper cavity and a lower cover with an upper cavity, wherein a PCB circuit board is arranged on the lower cover, the upper cover is arranged on the lower cover and covers the PCB circuit board, a GNSS antenna is arranged on the upper cover, a microprocessor module, a power management module, a solar charging control module and a GNSS board card or module are integrated on the top layer of the PCB circuit board, a wireless communication module is integrated on the bottom layer of the PCB circuit board, a storage module is integrated on the top layer or the bottom layer of the PCB circuit board at a spare position, an antenna of the wireless communication module is arranged outside the lower cover, and a shell is arranged outside the upper cover.
Further, a circle of shielding ground is arranged on the bottom surface of the PCB of the GNSS antenna and is in sealing connection with the upper cavity of the upper cover to form a shielding cavity, a cylindrical shielding chamber which is vertically and directly communicated is arranged between the upper cavity of the upper cover and the lower cavity of the upper cover, and a radio frequency connector of the GNSS antenna penetrates through the cylindrical shielding chamber and then is inserted into a radio frequency seat of the PCB; a circle of shielding ground is arranged on the bottom layer of the PCB, and the shielding ground is connected with the upper cavity of the lower cover in a sealing way to form a shielding cavity; the top layer of the PCB is provided with a solar charging control module shielding cavity and a GNSS board card or a module shielding cavity independently.
Further, the GNSS board card shielding cavity comprises an upper box body and a lower box body, and the upper box body and the lower box body are assembled and then are arranged on the PCB; the radio frequency connector and the connector of the GNSS board card extend out of the reserved outlet hole of the lower box body and are connected to the radio frequency base and the connector of the PCB.
Furthermore, the PCB, the lower box body and the upper box body are fastened and connected from bottom to top by adopting screws, and screw holes of the upper box body are not opened; and shielding grounds are arranged at all opening positions of the PCB, around the radio frequency seat and around the connector.
Furthermore, a circle of shielding ground is arranged outside the solar charging control module or the GNSS module on the PCB and is in sealing connection with the shielding cover.
Further, the shielding cover is an aluminum shell plate; and a signal test point is arranged at the bottom layer of the PCB corresponding to the solar charging control module.
Furthermore, the shielding ground adopts a gold plating mode, and the width or the diameter of the shielding ground completely covers the connection position.
Furthermore, a pluggable connecting terminal is arranged on the top layer of the PCB, the connecting terminal is connected with an aviation connector through a cable, and the protection grade of the aviation connector is IP68 and is used for being connected with an external battery and a solar panel; the lower cover is arranged on the vertical rod through threaded connection or a centering rod.
Further, the wireless communication module comprises a Bluetooth module, a LoRa module and a 4G module, and the three modules adopt triangular layout; the SIM card of the 4G module and the SD card of the storage module are arranged on the same side; the antennas of the Bluetooth module and the LoRa module are integrated rod antennas; the solar charging control module is far away from the GNSS board card or the module, and the corresponding bottom layer of the PCB circuit board is provided with a radiator.
Further, the microprocessor module adopts STM32L4 series controllers; the storage module comprises a SPIFASH memory and an SD card; the Bluetooth modules in the microprocessor module, the GNSS board card and the wireless communication module are in a long power-on state, and other modules are in a time-sharing working mode; the GNSS board card is a multi-star multi-frequency board card; the solar charging control module adopts a surge protection, reverse connection prevention protection and short circuit protection circuit, and adopts a photovoltaic cell maximum power point tracking technology; the GNSS antenna is a full-band built-in high-precision antenna and comprises L1/L2/L5 of a GPS, B1/B2/B3 of Beidou, G1/G2 of GLONASS and E1/E2/E5a/E5B frequency points of GALILEO.
The invention has the beneficial effects that:
The invention provides an integrated GNSS receiver suitable for field disaster monitoring, which integrates a microprocessor module, a power management module, a storage module, a solar charging control module, a GNSS board card, a wireless communication module (such as a 4G module, a LoRa module and a Bluetooth module) and the like on a PCB circuit board, wherein the wireless communication module antenna adopts an external mode, and can improve the signal strength in a severe environment. Through reasonable layout and integrated integration of the device modules, the power consumption and the production cost of the receiver can be effectively reduced, and the stability of field products is improved.
The invention provides an integrated GNSS receiver suitable for field disaster monitoring, which is characterized in that a GNSS board card, a GNSS antenna, a wireless communication module and a solar charging control module are placed in separate cavities, and each electromagnetic radiation interference source of the GNSS receiver is isolated structurally through the combined use of a shielding cavity and a shielding ground, so that the electromagnetic shielding effect is improved, and the electromagnetic interference problem of the integrated GNSS receiver is effectively solved.
The invention provides an integrated GNSS receiver suitable for field disaster monitoring, which adopts an integrated structural design, is connected with a vertical rod through a centering rod, and is convenient to install and simple in structure. The receiver shell adopts a mode of combining a plastic shell and a rigid lower cover, has good vibration resistance and meets the protection level requirement of IP 68. The receiver is connected with an external battery and a solar panel through an IP 68-level aviation connector, so that the power supply and debugging functions of the integrated GNSS receiver are completed.
The invention adopts an integrated design framework, completes each functional module of the split receiver by a simplified integrated circuit design, optimizes the circuit composition and layout thereof, solves the problems of electromagnetic and signal interference, test, transportation, maintenance and the like in product design, simplifies the product structure, reduces the power consumption and cost of the product and improves the reliability and maintainability of the product on the premise of meeting the monitoring function and performance requirements.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a circuit diagram of an integrated GNSS receiver for outdoor disaster monitoring according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of an integrated GNSS receiver for outdoor disaster monitoring according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of an integrated GNSS receiver suitable for field disaster monitoring according to an embodiment of the present invention;
The following reference numerals are included in the drawings:
The solar energy charging control module comprises a plastic shell 1, an upper cover 2, a lower cover 3, an upper box body 4, a lower box body 5, a GNSS board card 6, a GNSS antenna 7, a PCB 8, a 4G module 9, a Bluetooth module 10, a LoRA module 11 and a solar energy charging control module 12.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings and the specific embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The invention provides an integrated GNSS receiver suitable for field disaster monitoring, which mainly comprises a microprocessor module, a power management module, a GNSS board card, a storage module, a wireless communication module and an antenna (such as 4G, loRA or Bluetooth), a solar charging control module, a GNSS antenna and the like as shown in fig. 1.
The microprocessor module is used for scheduling and managing all module units, and is preferably an ultralow-power-consumption high-performance processor. In the embodiment, the microprocessor adopts a STM32L4 series controller with high performance and low power consumption, and has 5 serial ports which can complete communication with a GNSS board card, various wireless communication modules, a debugging serial port and the like; the management of a plurality of storage modules can be completed by the plurality of SPI interfaces; the abundant AD port and IO port are accomplished solar panel voltage, battery voltage, charge current's collection and monitoring work.
The power management module is used for controlling the module which needs long power-on and time-sharing work. The Bluetooth modules in the microprocessor module, the GNSS board card and the wireless communication module are in a long power-on state, and other modules can be configured in a time-sharing working mode.
The GNSS board card is used as a core unit of the GNSS receiver, can select multi-satellite multi-frequency board cards, meets the high precision requirement or the requirement of a shielded area, and also adopts a module mode for application occasions with low precision requirement and visual observation.
The storage module is used for storing the parameters, software and original data of the satellite. The storage module is realized by adopting two storage media, wherein one storage medium is used for storing parameters and software, the other storage medium is used for storing original data of a satellite, and an SD card is adopted.
The wireless communication module is used for wireless receiving and transmitting of data, remote configuration management and multi-sensor linkage. The wireless communication module in the embodiment comprises a 4G module, a LoRA module and a Bluetooth module, wherein the 4G module is mainly responsible for timing reporting of GNSS satellite original data and remote interaction of other data and commands; the LoRA module is responsible for receiving trigger signals of other sensors and completing linkage control of a plurality of LoRA sensors; the Bluetooth module is responsible for completing the functions of parameter wireless configuration, data information acquisition and batch wireless test of the field receiver. The antenna of the wireless communication module comprises a 4G antenna, a LoRA antenna and a Bluetooth antenna, wherein the antennas are all in an external mode, and LoRA and the Bluetooth antenna are designed into an integrated antenna for saving space.
The solar charging control module is used for carrying out charging and discharging management on the battery. In this embodiment, the solar charging controller adopts a Maximum Power Point Tracking (MPPT) technology of a photovoltaic cell, so that the photovoltaic cell can always output maximum power when the illumination intensity changes, so as to fully utilize solar energy. In order to improve the anti-interference and reliability of the module, a surge protection, reverse connection protection and short circuit protection circuit is added.
The GNSS antenna is a full-band built-in high-precision antenna and comprises frequency points such as L1/L2/L5 of a GPS, B1/B2/B3 of Beidou, G1/G2 of GLONASS, E1/E2/E5a/E5B of GALILEO and the like.
The invention provides an integrated GNSS receiver suitable for field disaster monitoring, which adopts the layout shown in figure 2 to realize integrated integration, and comprises an upper cover with an upper cavity and a lower cavity, a lower cover with an upper cavity, a PCB circuit board arranged between the upper cover and the lower cover, a top layer of the PCB circuit board arranged in the upper cover lower cavity, a bottom layer of the PCB circuit board arranged in the lower cover upper cavity, and the specific layout of each device module is as follows:
(a) It has been found through experimentation that the greatest source of interference from the GNSS antenna is from the GNSS card, and therefore the GNSS card and the GNSS antenna must be spatially isolated. In this embodiment, the GNSS board card and the GNSS antenna are placed in two independent sealed structural units, the GNSS antenna is placed in the upper cover upper cavity at the top of the integrated GNSS receiver, and for facilitating maintenance of the GNSS board card, the GNSS board card is placed on the top layer of the PCB circuit board and is located in the upper cover lower cavity.
(B) The microprocessor module is used as a dispatching processing unit of each module, key information is required to be judged through the pin state and the crystal oscillator state, and the key information is placed on the top layer of the PCB, so that debugging is facilitated.
(C) The power management module is used as a life channel of other modules and is placed on the top layer of the PCB, so that debugging and maintenance are facilitated.
(D) The wireless communication module is placed at the bottom layer of the PCB circuit board, so that electromagnetic interference between the wireless communication module and the GNSS circuit board is reduced. In this embodiment, the wireless communication module includes a bluetooth module, a LoRa module, and a 4G module, so that in order to reduce the interference between the three wireless communication modules, a triangle distribution manner may be adopted on the PCB; the SIM card of the 4G module is placed on the same side as far as possible with the SD card of the storage module so as to be convenient to operate. Considering that the signal intensity of the field monitoring environment is weak, the antenna of the wireless communication module adopts an external mode, so that the interference is small, and the signal gain is large. In order to simplify the interface of the external antenna, the LoRA antenna and the Bluetooth antenna can be designed as an integrated rod antenna.
(E) The solar charging control module is a high-current module, and electromagnetic fields generated when current passes through the inductor also have interference on signals of the GNSS board card. The solar charging control module is placed on the top layer of the PCB, and the solar charging control module is placed far away from the GNSS board card as far as possible in layout. Meanwhile, other devices are not placed on the back of the solar charging control module so as to place cooling fins, and electromagnetic interference brought by large charging current to a circuit board is reduced.
(F) The memory module can not produce electromagnetic interference to other modules, can be placed on the top layer and the bottom layer of the PCB, and the interface of the SD card memory is arranged at the edge position, so that the card taking is convenient.
The invention designs the electromagnetic shielding structure of each device module of the integrated GNSS receiver, and effectively solves the electromagnetic interference problem of the integrated GNSS receiver by structurally isolating each electromagnetic radiation interference source of the GNSS receiver. In the integrated GNSS receiver, the GNSS board card and the GNSS antenna are the largest pair of interference bodies, the wireless communication module is arranged at the second place, and finally the solar charging control module is arranged in a separate cavity, so that the electromagnetic shielding requirement is met.
As shown in fig. 3, the integrated GNSS receiver in this embodiment mainly includes a plastic housing 1, an upper cover 2, a lower cover 3, an upper case 4, a lower case 5, a GNSS board card 6, a GNSS antenna 7, a PCB circuit board 8, a 4G module 9, a bluetooth module 10, loRA module 11, a solar charging control module 12, and the like. The PCB circuit board 8 is the only circuit board of the integrated receiver and is arranged on the upper cavity of the lower cover 3 through screws; the upper cover 2 is connected with the lower cover 3 through screws, the lower cavity of the upper cover 2 covers the PCB 8, and the upper cavity of the upper cover 2 is provided with the GNSS antenna 7; the plastic housing 1 is mounted on the lower cover 3 and covers the upper cover 2.
In this embodiment, the structure of the integrated GNSS receiver is reduced to four cavities: GNSS antenna shielding cavity, GNSS integrated circuit board shielding cavity, solar charging control module shielding cavity and wireless communication module shielding cavity. The shielding ground of the bottom edge of the PCB of the GNSS antenna 7 and the upper cavity of the upper cover 2 form a GNSS antenna shielding cavity; the top layer of the PCB 8 and the cavity formed by the lower cavity of the upper cover 2 are respectively provided with a shielding cavity of the GNSS board card 6 and a shielding cavity of the solar charging control module 12; the shielding ground of the outermost edge of the bottom layer of the PCB 8 and the upper cavity of the lower cover 3 form a shielding cavity which is a wireless communication module shielding cavity, and the 4G module 9, the Bluetooth module 10 and the LoRA module 11 are arranged on the bottom layer of the PCB 8. The specific design of each shielding cavity is as follows:
(a) GNSS antenna shielding cavity
The GNSS antenna 7 is a full-band built-in high-precision antenna, has a circular structure, and an external output interface is a radio frequency connector.
In this embodiment, the upper cavity of the upper cover 2 is a circular structure cavity, the cavity wall is a circle of boss, a circle of shielding ground is added to the bottom plate edge of the PCB of the GNSS antenna 7, the GNSS antenna 7 is mounted on the upper cover upper cavity, and the shielding ground and the cavity wall are in sealing connection to form a shielding cavity. The PCB shielding part of the GNSS antenna 7 is uniformly provided with holes along the circumferential direction, the cavity wall of the upper cavity of the upper cover 2 is reserved with corresponding holes, the holes and the holes are connected through a plurality of screws, and the shielding part of the PCB side of the GNSS antenna is larger than the installation width of the boss of the upper cavity of the upper cover 2.
In addition, the external radio frequency connector of the GNSS antenna 7 adopts the mode of adding the radio frequency connector to the extension line, the upper cavity of the upper cover 2 and the lower cavity of the upper cover 2 are provided with a cylindrical shielding chamber which is directly connected up and down, the radio frequency connector of the GNSS antenna is inserted into a radio frequency seat on the PCB 8 after passing through the cylindrical shielding chamber, shielding ground is added around the radio frequency seat, and the area of the shielding ground is larger than the diameter of the outer circle of the cylindrical shielding chamber.
(B) GNSS board card shielding cavity
The GNSS integrated circuit board shields the chamber and sets up alone, is the rectangle box body of aluminum product matter, including last box body 4 and lower box body 5, installs on PCB circuit board 8 after the two equipment, and the GNSS integrated circuit board is installed in last, lower box body constitution's shielding chamber, and the hole position of the outside radio frequency connector of GNSS integrated circuit board and connector is reserved to lower box body 5, and the radio frequency connector of GNSS integrated circuit board and connector pass the hole connection of lower box body 5 on the radio frequency seat and the connector of PCB circuit board 8.
In this embodiment, all open the hole on four angles of last box body 4 and lower box body 5, also open corresponding hole on the PCB circuit board, the screw is from down upwards fastening connection PCB circuit board, lower box body, go up the box body trompil and can not be the through-hole, and all trompil positions of PCB circuit board set up shielding ground, guarantee good shielding effect. In addition, a gap is reserved between the lower box body 5 and the PCB circuit board, so that the GNSS board card radio frequency connector and the connector can be conveniently inserted. The lower box body 5 is provided with a circular through hole at the position of the radio frequency connector, a rectangular groove at the position of the connector, shielding grounds are arranged at the edges of the circular through hole and the rectangular groove, and shielding grounds are arranged at the positions of the radio frequency seat and the connector on the PCB.
(C) Solar charging control module shielding cavity
On one hand, the solar charging control module is a high-current device, and the inductor on the high-current device can generate electromagnetic interference on the GNSS board card or the module in the working process; on the other hand, the solar charging control module can generate larger heat in the working process.
In this embodiment, a circle of shielding ground loop is added at the edge of the solar charging control module circuit on the PCB circuit board, and a shielding cover is welded on the shielding ground loop to perform electromagnetic isolation, where the width of the shielding ground loop should be greater than the thickness of the shielding cover, so as to ensure that the electromagnetic is not leaked. If the GNSS board card adopts a module form, the GNSS board card can also adopt a shielding cover to carry out electromagnetic shielding.
The shielding cover is preferably an aluminum shell plate, so that the electromagnetic shielding effect can be achieved, and the heat dissipation can be assisted. The solar charging control module is a mature scheme, the later maintenance is less, and the cost can be effectively reduced by welding the aluminum shell plate. In addition, a test point can be added for a key signal of the solar charging control module and is arranged at the bottom layer of the PCB, so that the solar charging control module is convenient to maintain.
(D) Wireless communication module shielding cavity
Electromagnetic interference between the wireless communication module and the GNSS board card and between the wireless communication module and the solar charging control module is relatively small, and a 4G module 9, a Bluetooth module 10 and a LoRA module 11 in the wireless communication module are arranged on the bottom layer of the PCB 8 and are in shielding connection with the upper cavity of the lower cover 3 in a circle to form a shielding cavity.
The shielding ground of the PCB 8 in the integrated GNSS receiver needs to be matched with the shielding structure of each device module to achieve the electromagnetic shielding effect. If the outer edge of the bottom layer of the PCB is contacted with the lower cover, a circle of shielding ground is arranged; a circle of shielding ground is arranged in the hole for connecting the PCB with each structural member; and shielding grounds are also arranged at the positions of the radio frequency seat, the connector and the like on the PCB. In the above embodiment, the shielding ground can be gold-plated, and the width or diameter completely covers the connection position, so that good sealing is ensured.
The invention relates to an integrated GNSS receiver for monitoring outdoor disasters, which is characterized in that a lower cover of the integrated GNSS receiver is arranged on a vertical rod in a threaded connection or centering way when the integrated GNSS receiver is used in the open air; the PCB top layer is provided with a pluggable connecting terminal, the connecting terminal is connected with an aviation connector through a cable, the protection level of the aviation connector is IP68, and the PCB top layer is connected with an external battery and a solar panel to complete the power supply and debugging functions of the integrated GNSS receiver.
In summary, the invention solves the problems of transportation, test, electromagnetic and signal interference, maintenance and the like in product design by reasonably composing and arranging each functional module of the integrated GNSS receiver, simplifies the structure, reduces the installation and design cost and improves the reliability and maintainability of the product on the premise of meeting the monitoring function and performance requirements. Through multiple electromagnetic shielding tests, the composition and layout of the integrated receiver can effectively realize electromagnetic interference isolation, and the data integrity rate is ensured to be 99.67%.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The invention is not described in detail in a manner known to those skilled in the art.
Claims (2)
1. The integrated GNSS receiver is characterized by comprising an upper cover with an upper cavity and a lower cover with an upper cavity, wherein a PCB circuit board is arranged on the lower cover, the upper cover is arranged on the lower cover and covers the PCB circuit board, a GNSS antenna is arranged on the upper cover, a microprocessor module, a power management module, a solar charging control module and a GNSS board card or module are integrated on the top layer of the PCB circuit board, a wireless communication module is integrated on the bottom layer of the PCB circuit board, a storage module is integrated on the top layer or the bottom free position of the PCB circuit board, an antenna of the wireless communication module is arranged outside the lower cover, and a shell is arranged outside the upper cover;
A circle of shielding ground is arranged on the bottom surface of the PCB of the GNSS antenna, the shielding ground is in sealing connection with the upper cavity of the upper cover to form a shielding cavity, a cylindrical shielding chamber which is vertically and directly communicated is arranged between the upper cavity of the upper cover and the lower cavity of the upper cover, and a radio frequency connector of the GNSS antenna penetrates through the cylindrical shielding chamber and then is inserted into a radio frequency seat of the PCB; a circle of shielding ground is arranged on the bottom layer of the PCB, and the shielding ground is connected with the upper cavity of the lower cover in a sealing way to form a shielding cavity; the top layer of the PCB is provided with a solar charging control module shielding cavity and a GNSS board card or a module shielding cavity independently;
The GNSS board card shielding cavity comprises an upper box body and a lower box body, and the upper box body and the lower box body are assembled and then are arranged on the PCB; the radio frequency connector and the connector of the GNSS board card extend out of the reserved outlet hole of the lower box body and are connected to the radio frequency seat and the connector of the PCB;
The PCB, the lower box body and the upper box body are fixedly connected from bottom to top by adopting screws, and screw holes of the upper box body are not opened; shielding grounds are arranged at all opening positions of the PCB, around the radio frequency base and around the connector;
A circle of shielding ground is arranged outside the solar charging control module or the GNSS module on the PCB and is in sealing connection with the shielding cover;
The shielding cover is an aluminum shell plate; a signal test point is arranged at the bottom layer of the PCB corresponding to the solar charging control module;
The shielding ground adopts a gold plating mode, and the width or the diameter of the shielding ground completely covers the connection position;
The wireless communication module comprises a Bluetooth module, a LoRa module and a 4G module, wherein the three modules adopt triangular layout; the SIM card of the 4G module and the SD card of the storage module are arranged on the same side; the antennas of the Bluetooth module and the LoRa module are integrated rod antennas; the solar charging control module is far away from the GNSS board card or the module, and a radiator is arranged at the bottom layer of the corresponding PCB circuit board;
The Bluetooth modules in the microprocessor module, the GNSS board card and the wireless communication module are in a long power-on state, and other modules are in a time-sharing working mode;
The top layer of the PCB is provided with a pluggable connecting terminal, the connecting terminal is connected with an aviation connector through a cable, and the protection grade of the aviation connector is IP68 and is used for being connected with an external battery and a solar panel; the lower cover is arranged on the vertical rod through threaded connection or a centering rod.
2. The integrated GNSS receiver of claim 1 wherein the microprocessor module employs an STM32L4 series controller; the storage module comprises a SPIFASH memory and an SD card; the GNSS board card is a multi-star multi-frequency board card; the solar charging control module adopts a surge protection, reverse connection prevention protection and short circuit protection circuit, and adopts a photovoltaic cell maximum power point tracking technology; the GNSS antenna is a full-band built-in high-precision antenna and comprises L1/L2/L5 of a GPS, B1/B2/B3 of Beidou, G1/G2 of GLONASS and E1/E2/E5a/E5B frequency points of GALILEO.
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| CN202010418271.4A CN113687389B (en) | 2020-05-18 | 2020-05-18 | Integrated GNSS receiver suitable for field disaster monitoring |
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| CN202010418271.4A CN113687389B (en) | 2020-05-18 | 2020-05-18 | Integrated GNSS receiver suitable for field disaster monitoring |
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| CN105425249A (en) * | 2015-12-18 | 2016-03-23 | 上海华测导航技术股份有限公司 | GNSS receiving device |
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| US9054779B2 (en) * | 2012-09-14 | 2015-06-09 | Hewlett-Packard Development Company, L.P. | Radio frequency interference shield |
| CN105182368B (en) * | 2015-10-08 | 2018-06-12 | 广州中海达定位技术有限公司 | Gnss satellite receiver |
| CN205176278U (en) * | 2015-11-13 | 2016-04-20 | 励精科技(上海)有限公司 | Gnss receiver |
| CN206788368U (en) * | 2016-10-19 | 2017-12-22 | 湖南鼎方量子科技有限公司 | A kind of RDSS and GNSS integrate antijam receiver |
| CN210142197U (en) * | 2019-06-20 | 2020-03-13 | 湖南联智监测科技有限公司 | Low-power-consumption GNSS monitoring receiver |
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| CN103344966A (en) * | 2013-06-26 | 2013-10-09 | 上海华测导航技术有限公司 | GNSS receiver with high electromagnetic compatibility and high three-proof performance |
| CN105425249A (en) * | 2015-12-18 | 2016-03-23 | 上海华测导航技术股份有限公司 | GNSS receiving device |
| CN110133686A (en) * | 2019-06-06 | 2019-08-16 | 上海华测导航技术股份有限公司 | The big-dipper satellite geological disaster professional monitoring stations of high integration |
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