CN113791428B - Anti-electromagnetic interference Beidou short message portable mobile terminal - Google Patents
Anti-electromagnetic interference Beidou short message portable mobile terminal Download PDFInfo
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- CN113791428B CN113791428B CN202111072565.7A CN202111072565A CN113791428B CN 113791428 B CN113791428 B CN 113791428B CN 202111072565 A CN202111072565 A CN 202111072565A CN 113791428 B CN113791428 B CN 113791428B
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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
- G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
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- 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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- Radar, Positioning & Navigation (AREA)
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The utility model discloses an anti-electromagnetic interference Beidou short message portable mobile terminal, which relates to the technical field of Beidou communication equipment and comprises a shell, wherein a control module is packaged in the shell, the control module is provided with a main board body and an operation panel, components are arranged on two sides of the main board body, and each component comprises a Beidou short message unit arranged on the top surface of the main board body, and a power supply, a main control unit, a Beidou positioning unit and an expansion component group which are respectively arranged on the bottom surface of the main board body; the Beidou short message unit, the Beidou positioning unit and the expansion component group are respectively and electrically connected with the main control unit, and the operation panel is electrically connected with the main control unit. According to the utility model, through the circuit design and the design of the shielding cover, the influence of electromagnetic interference generated by each component in the portable mobile terminal on the Beidou short message function can be reduced to the maximum extent, and the normal operation of the portable mobile terminal with the built-in Beidou short message function is ensured.
Description
Technical Field
The utility model relates to the technical field of Beidou communication equipment, in particular to an anti-electromagnetic interference Beidou short message portable mobile terminal.
Background
With the successful transmission of the Beidou No. three satellite, the Beidou satellite navigation positioning system signal has realized global coverage, and the short message system becomes a unique function of the satellite world, so that the Beidou satellite navigation positioning system signal has very high practical value in the important national fields of fishery, transportation, agriculture, emergency rescue, weather hydrology and the like, plays an important role in daily life, for example, in daily portable mobile terminal equipment, the Beidou satellite watch, the Beidou satellite mobile power supply and the like are all faithful advocates of the Beidou navigation system, and most of the equipment takes an RDSS module as a basic module, introduces the latest short message information technology, and realizes the functions of accurate positioning, satellite short message position reporting and other information.
The short message module communication function is completely based on the transmission of short information by radio waves between a satellite and a mobile target, so that the realization of the short message module function is also very susceptible to the influence of a magnetic field environment in a portable mobile terminal, and the following situations can occur in a satellite watch with a Beidou system function module: 1) Along with the diversification of material life, the electronic products can be seen everywhere in the living environment, so that a magnetic field which can not circulate can be formed everywhere, the watch is used as a necessary ornament for many consumers, the running environment of the watch is more and more easily influenced by external factors, and the magnetization phenomenon of the Beidou system functional module in the watch is caused. 2) Consumers also have high demands on the functionality of satellite watches, resulting in a watch movement that requires a large number of components to be configured to achieve the intended functions. Because the space of the satellite watch is extremely limited, part of components generate communication waveforms to form electromagnetic interference radiated to different degrees during operation, so that the functions of receiving and transmitting satellite signals of the watch are likely to not reach the preset effect or even fail under the condition of electromagnetic interference.
How to weaken electromagnetic interference generated by each component in a portable mobile terminal during operation is a problem to be solved.
Electromagnetic interference is avoided through antimagnetic materials in the traditional mobile terminal, the terminal is simple in function, few in configuration components and parts, and good antimagnetic effect can be achieved under most conditions. However, for multi-configuration equipment terminals, because of the specificity of components, many of the equipment terminals cannot be manufactured and configured by adopting an antimagnetic material as a main material, and electromagnetic interference needs to be reduced in a more scientific and effective manner.
Chinese patent publication No. CN110311446A discloses a mobile power supply with Beidou positioning and short message sending position functions, which comprises a power management module, a Beidou module and a display module; the power management module provides working voltage for the Beidou module and the display module; the power management module comprises a lithium polymer battery, a power management sub-module, a charging interface and a power supply interface; the power management submodule adopts a power management chip; the power management chip is respectively connected with the lithium polymer battery, the charging interface and the power supply interface; the Beidou module comprises an antenna, a radio frequency sub-module, a control sub-module, an RDSS function sub-module and an RNSS/GPS function sub-module. The utility model is described in the [ 0016 ] section of the specification, and the Beidou module is contained in the Beidou module, and the module adopts a double-layer high-quality sealing metal box and has good electromagnetic interference resistance. The method for sealing the Beidou module by adopting the double-layer high-quality sealing metal box can weaken the interference to the Beidou module to a certain extent, but has higher material requirement to the metal box and poorer effect.
Chinese patent publication No. CN209297119U discloses a beidou antenna watch, which comprises a watch body, the watch body is connected with a watchband, a watch core component is arranged in the watch body, the watch core component comprises a dial plate, an inner shadow ring is arranged on the dial plate, and a beidou antenna is embedded on the inner shadow ring. The utility model is described in the [ 0021 ] section of the specification, and the problem that the Beidou antenna receives signals and is easy to be shielded by a steel shell and easy to be subjected to electromagnetic interference in a meter is solved by arranging the Beidou antenna at the highest receiving position in the meter, so that the manufacturing requirement on equipment is high, the problem that components and parts can not intrinsically solve the electromagnetic interference on a Beidou module is solved, and the effect is also poor.
Disclosure of Invention
The utility model aims to provide portable mobile terminal equipment with a built-in Beidou short message function module, which has small electromagnetic interference influence on the Beidou short message function module during operation.
The utility model adopts the following technical scheme: the anti-electromagnetic interference Beidou short message portable mobile terminal comprises a shell, wherein a control module is packaged in the shell, the control module is provided with a main board body and an operation panel, components are arranged on two sides of the main board body, and each component comprises a Beidou short message unit arranged on the top surface of the main board body, and a power supply, a main control unit, a Beidou positioning unit and an expansion component group which are respectively arranged on the bottom surface of the main board body; the Beidou short message unit, the Beidou positioning unit and the expansion component group are respectively and electrically connected with the main control unit, and the operation panel is electrically connected with the main control unit.
As an optimization scheme, the main board body is a four-layer printed circuit board and comprises a first signal layer, a power layer, a ground layer and a second signal layer which are sequentially arranged from top to bottom; the circuit face of the Beidou short message unit is arranged on a first signal layer, the main control unit, the Beidou positioning unit and the circuit face of the expanding component group are arranged on a second signal layer in a partitioned mode, and the periphery of each component on two sides of the main board body is provided with a ground wire in a partitioned mode.
As an optimization scheme, the expansion component group comprises a temperature sensor and an azimuth sensor.
As an optimization scheme, the beidou short message unit comprises a beidou RDSS transceiver module and a short message antenna, wherein the beidou RDSS transceiver module is positioned at the top of the short message antenna, the short message antenna is used for receiving and sending wireless message signals, and the beidou RDSS transceiver module is used for processing the message signals received by the short message antenna and sending the message signals to a north-fighting satellite system through the short message antenna.
As an optimization scheme, the main board body is connected with a flexible board, the flexible board is arranged at the bottom of the power supply, and a heart rate blood oxygen detection unit is arranged on the flexible board.
As an optimization scheme, the control module is provided with a shielding cover group, and comprises a first shielding cover and a second shielding cover, wherein the first shielding cover is respectively arranged between the short message antenna and the main board body, and the second shielding cover is arranged between the main board body and the power supply.
As an optimization scheme, the portable mobile terminal comprises an electronic watch, the shell comprises an upper shell and a lower shell which are packaged together, and the operation panel is arranged on the upper shell.
As an optimization scheme, the upper shell and the lower shell are made of ABS materials.
Compared with the prior art, the utility model has the advantages that:
the main body of the main board adopts a partition wiring technology, and the short message module of high-frequency radiation is independently arranged on the front surface of the main body, so that the electromagnetic interference of the main body to other components is reduced; other components are regional placed on the back of the main board according to functions, so that electromagnetic interference generated by the components of the main board body during operation is reduced.
The utility model adopts a layered wiring technology, and reduces electromagnetic interference generated by each functional wire when current passes.
The shielding cover is arranged on the back of the main board body, so that mutual electromagnetic interference between the main board front short message module and components on the back of the main board during operation is effectively shielded, and electromagnetic interference of the main board components on the Beidou antenna and the short message antenna is also shielded.
According to the utility model, the short message antenna is independently arranged, and the shielding covers are designed on the back surface of the short message antenna and at the bottom of the machine core, so that electromagnetic interference generated during working between the antenna and other components in the system is effectively avoided, and the integrity and timeliness of running and acquiring data of each component are ensured.
The shell of the portable mobile terminal provided by the utility model is made of ABS material, and has good electromagnetic interference resistance.
Drawings
Fig. 1 is a schematic structural diagram of an electromagnetic interference resistant beidou short message portable mobile terminal;
fig. 2 is a schematic structural diagram of a main board body of the present utility model;
FIG. 3 is a top view of the main board body of the present utility model;
FIG. 4 is a bottom view of the main board body of the present utility model;
FIG. 5 is a schematic diagram of a first signal layer circuit partition of a motherboard body according to the present utility model;
FIG. 6 is a schematic diagram of a circuit partition of a second signal layer of the main board body according to the present utility model;
fig. 7 is a schematic structural diagram of another embodiment of an electromagnetic interference resistant beidou short message portable mobile terminal provided by the present utility model;
the portable electronic device comprises a 1-main board body, a 101-first signal layer, a 102-power supply layer, a 103-ground layer, a 104-second signal layer, a 2-operation panel, a 3-Beidou short message unit, a 301-Beidou RDSS transceiver module, a 302-short message antenna, a 4-main control unit, a 5-Beidou positioning unit, a 6-expansion component group, a 601-temperature sensor, a 602-azimuth sensor, a 7-flexible board, an 8-heart rate blood oxygen detection unit, a 9-shielding cover group, a 901-first shielding cover, a 902-second shielding cover, a 10-shell, a 1001-upper shell, a 1002-lower shell and an 11-power supply.
Detailed Description
In the following, in order to facilitate the understanding of the technical solutions of the present utility model by a person skilled in the art, reference will be made to the accompanying drawings for further description. It should be understood that the description is only illustrative and is not intended to limit the scope of the utility model.
In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the utility model. It may be evident, however, that one or more embodiments may be practiced without these specific details. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present utility model.
Fig. 1 is a schematic structural diagram of an anti-electromagnetic interference beidou short message portable mobile terminal, which comprises a shell 10, wherein a control module is encapsulated in the shell 10, the control module comprises a main board body 1 and an operation panel 2, a power supply 11 for providing electric energy for each functional module is arranged on the main board body 1, components for completing each functional module are arranged on the top surface and the bottom surface of the main board body 1, each component comprises a beidou short message unit 3 arranged on the top surface of the main board body 1 and mainly used for editing short message content and transmitting the short message content to other receiving terminals through a beidou satellite, and each component further comprises a main control unit 4 which is respectively arranged on the bottom surface of the main board body 1 and mainly used for controlling the working state of each functional module, and particularly, the main control unit 4 is a microprocessor. The components also comprise a Beidou positioning unit 5 for providing a positioning navigation function for the mobile terminal and an expansion component group 6 for providing other auxiliary functions; the main board body 1 adopts a partition wiring technology, and the Beidou short message unit 3 of high-frequency radiation is independently arranged on the front surface of the main board body 1, so that electromagnetic interference to other components is reduced; other components are regional placed on the bottom surface of the main board body 1 according to functions, so that electromagnetic interference generated by the components in the main board body 1 during operation is reduced. The Beidou short message unit 3, the Beidou positioning unit 5 and the expansion component group 6 are respectively and electrically connected with a microprocessor of the main control unit 4, and the microprocessor performs unified management and coordination work on each component arranged on the main board body 1.
The operation panel 2 is electrically connected with the main control unit 4 and is used for displaying information fed back by the main control unit 4 to an operator, and meanwhile man-machine interaction with the operator is facilitated. Specifically, a client application is installed on the portable mobile terminal, a microprocessor is connected through an operation panel 2, when the client application is started to enter a Beidou short message function client interface, the mobile terminal starts a Beidou short message function, other function modules are closed at the same time, at the moment, a Beidou short message function 3 editing button displayed on the operation panel 2 becomes clickable, the button is clicked to enter a short message editing page, the content of the edited short message is sent out through a Beidou satellite, and when a client is exited or the client is switched to a background, the mobile terminal closes power supply of the Beidou short message function 3 and recovers other functions at the same time. Specifically, the operation panel 2 may be a touch screen control panel, which is more convenient to operate in a touch screen manner, and may be an operation button or other manners, so long as the use requirement is satisfied.
As shown in fig. 2, the main board body of the present utility model adopts a layered routing technology, so as to reduce electromagnetic interference generated by each functional wire when current passes. The main board body 1 is a four-layer printed circuit board and comprises a first signal layer 101, a power layer 102, a ground layer 103 and a second signal layer 104 which are sequentially arranged from top to bottom, wherein an insulating layer is arranged between each layer. As shown in fig. 3 to 4, the top layer is a first signal layer 101, the circuit surface of the beidou short message unit 3 is arranged on the first signal layer 101, a short message module function area is formed on the top layer of the main board body 1, the bottom layer is a second signal layer 104, the circuit surface partitions of the main control unit 4, the beidou positioning unit 5 and the expansion component group 6 are arranged on the second signal layer 104, and a main control area, a beidou positioning function area and other expansion component function areas such as an azimuth function area, a temperature function area and the like are respectively formed, of course, the bottom layer of the main board body 1 can be further provided with an operation function area and a display function area for being connected with an operation panel so as to realize man-machine interaction with an operator. In order to reduce electromagnetic interference generated by each component on the main board body 1 during operation, ground wires are arranged around each component on two sides of the main board body 1.
As shown in fig. 5 to 6, in one embodiment of the present utility model, the expansion component set 6 includes a temperature sensor 601 and an azimuth sensor 602, where the temperature sensor 601 may be used to sense a temperature state in an environment where the mobile terminal is located, and transmit a state value to the main control unit 4, and feedback the state value to an operator through the operation panel 2, where the azimuth sensor 602 is used to provide a function of identifying an azimuth for the operator, so as to avoid the operator getting lost, and overall promote user experience. Of course, the expansion component set 6 may be a humidity sensor, a carbon dioxide sensor, etc., and functional modules may be added according to the required use environment, which is not described herein.
In one embodiment provided by the utility model, the Beidou short message unit 3 supports Beidou third frequency points, the Beidou short message unit 3 comprises a Beidou RDSS receiving and transmitting module 301 and a short message antenna 302, the Beidou RDSS receiving and transmitting module 301 is positioned at the top of the short message antenna 302, the short message antenna 302 is used for receiving and transmitting wireless message signals, and the Beidou RDSS receiving and transmitting module 301 is used for processing message signals received by the short message antenna and transmitting the message signals to a north-fighting satellite system through the short message antenna 302. Specifically, the beidou RDSS transceiver module 301 can acquire to-be-transmitted information input by an operator from the operation panel 2 through the microprocessor, and send the to-be-transmitted information to the north bucket satellite system through the short message antenna 302 in the form of a beidou short message to another mobile terminal with a built-in beidou short message function, so that the beidou communication mode of the mobile terminal is realized. Because the Beidou satellite signals can cover the whole asia-pacific area at present, the communication terminal can be applied to areas with poor mobile signals or no mobile signals, and bidirectional information transmission and reception are carried out through the Beidou satellite system, so that the communication of the mobile terminal in the areas is realized.
As shown in fig. 7, in another embodiment provided by the present utility model, a flexible board 7 is connected to a main board body 1, so as to expand a functional module of the portable mobile terminal, and provide good technical support for enhancing entertainment and practicality of the mobile terminal, in this embodiment, the flexible board 7 is disposed at the bottom of a power supply 11, and a heart rate blood oxygen detection unit 8 is welded on the flexible board 7, so as to obtain heart rate data of an operator, detect blood oxygen concentration of the operator, and obtain blood oxygen concentration data of the operator.
As shown in fig. 7, the utility model configures a separate placement space for the short message antenna independently of the main board, and a shielding cover group 9 is further provided in the control module, wherein the shielding cover group 9 comprises a first shielding cover 901 positioned between the short message antenna 302 and the main board body 1, and a second shielding cover 902 positioned between the main board body 1 and the power supply 11, the first shielding cover 901 effectively shields the magnetic field interference generated between the main board body 1 and the short message antenna 302, and the second shielding cover 902 effectively avoids the electromagnetic interference generated during operation between other components in the main board body 1, so that the operation of each component and the integrity and timeliness of acquired data are ensured.
In one embodiment of the present utility model, the portable mobile terminal is an electronic watch, the top surface of the main board body 1 faces the dial, and the bottom surface of the main board body 1 faces away from the dial. Of course, the portable mobile terminal may also be a notebook computer, a PAD (tablet computer), a PMP (portable multimedia player), a mobile power supply, and the like.
In one embodiment of the present utility model, the housing 10 includes an upper housing 1001 and a lower housing 1002 that are packaged together to facilitate installation and removal of the device, and the control module is integrally packaged in the upper housing 1001 and the lower housing 1002, and the operation panel 2 is provided on the upper housing 1001 to facilitate observation and use by an operator.
In one embodiment of the present utility model, the upper housing 1001 and the lower housing 1002 are made by one-step injection molding of ABS material, which has no electromagnetic interference to the internal antenna of the terminal.
As can be seen from the above description, the main board body of the utility model adopts the partition wiring technology, and the short message module of high-frequency radiation is independently placed on the front surface of the main board body, so that the electromagnetic interference to other components is reduced; other components are regional placed on the back of the main board according to functions, so that electromagnetic interference generated by the components of the main board body during operation is reduced. The utility model adopts a layered wiring technology, and reduces electromagnetic interference generated by each functional wire when current passes. The shielding cover is arranged on the back of the main board body, so that mutual electromagnetic interference between the main board front short message module and components on the back of the main board during operation is effectively shielded, and electromagnetic interference of the main board components on the Beidou antenna and the short message antenna is also shielded. According to the utility model, the short message antenna is independently arranged, and the shielding covers are designed on the back surface of the short message antenna and at the bottom of the machine core, so that electromagnetic interference generated during working between the antenna and other components in the system is effectively avoided, and the integrity and timeliness of running and acquiring data of each component are ensured. The shell of the portable mobile terminal provided by the utility model is made of ABS material, has good electromagnetic interference resistance, and has no electromagnetic interference to the internal antenna of the terminal. The success rate of time service and positioning of the Beidou short message satellite watch in the open area reaches more than 99%, and the success rate of receiving and transmitting functions of the Beidou short message reaches more than 95%.
The above examples are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solution of the present utility model should fall within the scope of protection defined by the claims of the present utility model without departing from the spirit of the present utility model.
Claims (6)
1. An anti-electromagnetic interference Beidou short message portable mobile terminal is characterized in that: the device comprises a shell, wherein a control module is packaged in the shell, the control module is provided with a main board body and an operation panel, components are arranged on two sides of the main board body, and each component comprises a Beidou short message unit arranged on the top surface of the main board body, a main control unit, a Beidou positioning unit and an expansion component group which are respectively arranged on the bottom surface of the main board body; the shell is internally provided with a power supply arranged at one side of the bottom surface of the main board body; the Beidou short message unit, the Beidou positioning unit and the expansion component group are respectively and electrically connected with the main control unit, and the operation panel is electrically connected with the main control unit, wherein the Beidou short message unit comprises a Beidou RDSS transceiver module and a short message antenna; the main board body is a four-layer printed circuit board and comprises a first signal layer, a power layer, a ground layer and a second signal layer which are sequentially arranged from top to bottom; the circuit surface of the Beidou short message unit is arranged on a first signal layer, the circuit surfaces of the main control unit, the Beidou positioning unit and the expansion component groups are arranged on a second signal layer in a partitioned manner, the periphery of each component on two sides of the main board body is provided with a ground wire in a partitioned manner, the main board body is connected with a flexible board, and the flexible board is arranged at the bottom of the power supply; the control module is provided with a shielding cover group, and comprises a first shielding cover and a second shielding cover, wherein the first shielding cover is respectively arranged between the short message antenna and the main board body, and the second shielding cover is arranged between the main board body and the power supply.
2. The electromagnetic interference resistant Beidou short message portable mobile terminal of claim 1, wherein: the expansion component group comprises a temperature sensor and an azimuth sensor.
3. The electromagnetic interference resistant Beidou short message portable mobile terminal of claim 1, wherein: and a heart rate blood oxygen detection unit is arranged on the flexible plate.
4. The electromagnetic interference resistant Beidou short message portable mobile terminal of claim 1, wherein: the Beidou RDSS transceiver module is positioned at the top of the short message antenna, the short message antenna is used for receiving and sending wireless message signals, and the Beidou RDSS transceiver module is used for processing the message signals received by the short message antenna and sending the message signals to the north bucket satellite system through the short message antenna.
5. The electromagnetic interference resistant beidou short message portable mobile terminal according to any one of claims 1-4, wherein: the portable mobile terminal comprises an electronic watch, wherein the shell comprises an upper shell and a lower shell which are packaged together, and the operation panel is arranged on the upper shell.
6. The electromagnetic interference resistant Beidou short message portable mobile terminal of claim 5, wherein: the upper shell and the lower shell are made of ABS materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111072565.7A CN113791428B (en) | 2021-09-14 | 2021-09-14 | Anti-electromagnetic interference Beidou short message portable mobile terminal |
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| CN202111072565.7A CN113791428B (en) | 2021-09-14 | 2021-09-14 | Anti-electromagnetic interference Beidou short message portable mobile terminal |
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| CN113791428A CN113791428A (en) | 2021-12-14 |
| CN113791428B true CN113791428B (en) | 2023-06-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6958445B1 (en) * | 2004-12-16 | 2005-10-25 | Hewlett-Packard Development Company, L.P. | Electromagnetic interference shield for electronic devices on a circuit board |
| CN104459715A (en) * | 2014-12-25 | 2015-03-25 | 黄石一木信息科技有限公司 | Satellite signal positioning device for Beidou second-generation navigation system |
| CN107132561A (en) * | 2017-07-14 | 2017-09-05 | 北斗民用战略新兴产业（重庆）研究院有限公司 | A kind of multi-functional Big Dipper portable device |
| CN208367455U (en) * | 2018-07-06 | 2019-01-11 | 重庆九洲星熠导航设备有限公司 | A kind of multi-functional Beidou wrist-watch towards outdoor sports |
| CN212229438U (en) * | 2020-07-14 | 2020-12-25 | 湖南北斗天汇信息科技有限公司 | Beidou space-time meter with heart rate, blood oxygen and body temperature monitoring functions |
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