CN108200230B - mobile phone satellite communication method based on STM32 platform - Google Patents
mobile phone satellite communication method based on STM32 platform Download PDFInfo
- Publication number
- CN108200230B CN108200230B CN201711430326.8A CN201711430326A CN108200230B CN 108200230 B CN108200230 B CN 108200230B CN 201711430326 A CN201711430326 A CN 201711430326A CN 108200230 B CN108200230 B CN 108200230B
- Authority
- CN
- China
- Prior art keywords
- module
- chip
- adopts
- communication
- satellite communication
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Mobile Radio Communication Systems (AREA)
- Telephone Function (AREA)
Abstract
the invention relates to a mobile phone satellite communication method based on an STM32 platform, which adopts the design of an STM32F427 chip platform, wherein a storage system, a power supply network, an audio system, a core module, a BT/WIFI module, a key module, an LCD module, an SIM card module and a level conversion module which are mutually communicated and connected are integrated on a terminal main body of the STM32F427 chip; the invention realizes a complete set of digital signal processing instruction (DSP) and a Memory Protection Unit (MPU), and improves the safety of the mobile phone satellite communication application program; the hand-held terminal system based on the STM32 platform can realize the mobile phone communication function and support the free switching between the satellite communication mode and the traditional GSM mobile communication module.
Description
Technical Field
the invention relates to the technical field of satellite communication production, in particular to a mobile phone satellite communication method based on an STM32 platform.
background
The existing ground mobile communication infrastructure can already meet the communication service in the main land area, but the existing ground mobile communication infrastructure can not implement good communication service in special conditions such as sea, air, remote land area or extreme area, particularly in emergency rescue and relief work facing emergency and serious natural disaster, military application and the like, and under the condition, the satellite mobile communication system is still the only reliable choice.
the satellite mobile communication system can provide mobile communication services such as voice, data, short messages and the like in a region or even a global range for users by utilizing mobile communication satellites with different high and low orbits; the satellite mobile communication has the characteristics of large coverage area, long acting distance, flexible networking, basically unrelated communication cost with distance, no limitation of the existing ground equipment, small influence of terrain and the like.
The vigorous development of satellite communication systems, particularly the successful launching of the one-day-through mobile communication satellite in our country, marks that China enters the mobile phone era of satellite mobile communication, however, the existing satellite communication mode has poor practicability and low safety, and limits the application of the mobile phone satellite communication technology.
the scheme adopts an STM32F427 platform, and the platform supports all ARM single-precision data processing instructions and data types based on a floating point unit (single-precision floating point arithmetic unit) with the core operation frequency of a high-performance ARM CORTEX-M432-bit reduced instruction set as high as 180MHz and a CORTEX-M4 core function. It also implements a full set of digital signal processing instructions (DSP) and Memory Protection Unit (MPU), thereby improving the security of the application.
The STM32F427 platform is used as an inner core, a plurality of systems such as storage, power supply, audio and the like are built, the mobile phone function is completed, and the practicability of the communication terminal is improved.
disclosure of Invention
The invention aims to provide a mobile phone satellite communication method based on an STM32 platform aiming at the technical problems of the existing mobile phone satellite communication, wherein an STM32F427 platform is adopted, and a floating point unit with core operation frequency as high as 180MHz based on a high-performance ARM CORTEX-M432-bit simplified instruction set supports all ARM single-precision data processing instructions and data types, so that a complete set of digital signal processing instructions (DSP) and a Memory Protection Unit (MPU) are further realized, and the safety of a mobile phone satellite communication application program is improved; the hand-held terminal system based on the STM32 platform can realize the mobile phone communication function and support the free switching between the satellite communication mode and the traditional GSM mobile communication module.
The invention is realized by the following technical scheme:
a mobile phone satellite communication method based on an STM32 platform is characterized in that an STM32F427 chip platform design is adopted, and the method comprises the following steps:
Step 1): the STM32F427 chip terminal body is built, and the STM32F427 chip terminal body is integrated with a storage system, a power supply network, an audio system, a core module, a BT/WIFI module, a key module, an LCD module, an SIM card module and a level conversion module which are mutually communicated and connected;
Step 2): the method comprises the steps that a storage system of the mobile phone is constructed by combining a body memory and an external TF card, wherein the body memory adopts an MX69GL642E chip of MXIC electronics, and the MX69GL642E chip is integrated with a NOR FLASH + RAM of high-speed data transmission; the external TF card is accessed to the ideographic semiconductor STM32 through an SPI interface to support mobile phone storage expansion;
step 3): the method comprises the following steps of establishing a power supply network, wherein the power supply network is composed of a power supply part and a charging part, the power supply part adopts an LP3923 chip of a TI company, and the charging part adopts a BQ24259 chip of the TI company;
step 4): the audio system is constructed, the audio system adopts an LM49350 chip of TI as an audio coding and decoding chip, and the audio system is integrated with a satellite communication and GSM communication voice module, a Bluetooth (BT) voice module and a multimedia playing module;
The satellite communication and GSM communication voice module adopts a PCM data transmission mode, and data are processed by MODEM and then transmitted to an audio CODEC chip for AD/DA conversion and transmitted to a sounding device for playing;
The Bluetooth (BT) voice module transmits a radio frequency voice signal to the Bluetooth module in a PCM data transmission mode, and transmits the radio frequency voice signal to the Bluetooth device for playing after being received and transmitted by the Bluetooth module;
Step 5): the method comprises the following steps of building a core module, wherein the core module comprises an AP application processor module, a memory, a CP satellite communication module, a GSM mobile communication module and a voice module;
the AP application processor module is responsible for logic processing of various services, the communication processor module is responsible for establishing a communication link and packaging the services, the memory module is mainly used for storing and executing data and codes, the voice module is used for receiving and transmitting voice data,
step 6): the method comprises the following steps of establishing a BT/WIFI module, wherein the BT/WIFI module adopts a BT/WIFI module LBEE5KL1DX of MURATA company, and the BT/WIFI module LBEE5KL1DX supports WIFI 802.11 b/g/n and Bluetooth v 4.1;
Step 7): the key module is configured, the key module adopts 20 independent physical keys and is realized by adopting an extended GPIO chip, the chip adopts an AW9523B chip of Shanghai AWINIC company, and an I2C protocol is adopted to control the AW9523B chip and is extended to 16 paths of GPIO interfaces;
Step 8): the LCD module is designed, the LCD module adopts a Shenzhen Laoyou electronic TFT module with the model of SX177QQVGA101, and the TFT module adopts an SPI communication mode to carry out STM32 control and data transmission;
Step 9): the SIM card module is designed, and supports an SIM card seat integrated with 2 NANO models for matching the communication requirements of two different modes of satellite communication and GSM mobile communication;
step 10): the level conversion module is configured and integrated with a level conversion chip TXB0104 and a level conversion chip TXS0104E of the TI. The level shift chip TXB0104 is used for level shift of a common IO port, and the level shift chip TXS0104E is used for level shift of an I2C protocol.
Furthermore, the power supply part adopts sub-modules to independently supply power, the adopted LP3923 chip provides 8 different LDO power supply modes, and the output size of the LDO is controllable.
further, the charging part adopts a BQ24259 charging management chip of TI company to support the process control of complete charging.
the invention provides a mobile phone satellite communication method based on an STM32 platform, which adopts an STM32F427 platform, supports all ARM single-precision data processing instructions and data types based on a floating point unit with the core operation frequency of a high-performance ARM CORTEX-M432-bit simplified instruction set up to 180MHz and a CORTEX-M4 core function, and further realizes a complete set of digital signal processing instructions (DSP) and a Memory Protection Unit (MPU), thereby improving the safety of mobile phone satellite communication application programs; the hand-held terminal system based on the STM32 platform can realize the mobile phone communication function and support the free switching between the satellite communication mode and the traditional GSM mobile communication module.
drawings
FIG. 1 is a schematic structural diagram of an STM32F427 chip termination body in the present invention.
FIG. 2 is a schematic structural diagram of a memory system according to the present invention.
Fig. 3 is a schematic structural diagram of a power supply network according to the present invention.
fig. 4 is a schematic structural diagram of an audio system according to the present invention.
fig. 5 is a schematic structural diagram of a core module according to the present invention.
fig. 6 is a schematic structural diagram of the BT/WIFI module of the present invention.
fig. 7 is a schematic structural diagram of a key module according to the present invention.
Detailed Description
the invention is further described with reference to figures 1, 2, 3, 5, 6 and 7.
The invention relates to a mobile phone satellite communication method based on an STM32 platform, which is characterized in that an STM32F427 chip platform design is adopted, and the method comprises the following steps:
Step 1): the STM32F427 chip terminal body is built, and the STM32F427 chip terminal body is integrated with a storage system, a power supply network, an audio system, a core module, a BT/WIFI module, a key module, an LCD module, an SIM card module and a level conversion module which are mutually communicated and connected;
Step 2): the method comprises the steps that a storage system of the mobile phone is constructed by combining a body memory and an external TF card, wherein the body memory adopts an MX69GL642E chip of MXIC electronics, and the MX69GL642E chip is integrated with a NOR FLASH + RAM of high-speed data transmission; the external TF card is accessed to the ideographic semiconductor STM32 through an SPI interface to support mobile phone storage expansion;
step 3): the method comprises the following steps of establishing a power supply network, wherein the power supply network is composed of a power supply part and a charging part, the power supply part adopts an LP3923 chip of a TI company, and the charging part adopts a BQ24259 chip of the TI company;
Step 4): the audio system is constructed, the audio system adopts an LM49350 chip of TI as an audio coding and decoding chip, and the audio system is integrated with a satellite communication and GSM communication voice module, a Bluetooth (BT) voice module and a multimedia playing module;
The satellite communication and GSM communication voice module adopts a PCM data transmission mode, and data are processed by MODEM and then transmitted to an audio CODEC chip for AD/DA conversion and transmitted to a sounding device for playing;
the Bluetooth (BT) voice module transmits a radio frequency voice signal to the Bluetooth module in a PCM data transmission mode, and transmits the radio frequency voice signal to the Bluetooth device for playing after being received and transmitted by the Bluetooth module;
step 5): the method comprises the following steps of building a core module, wherein the core module comprises an AP application processor module, a memory, a CP satellite communication module, a GSM mobile communication module and a voice module;
The AP application processor module is responsible for logic processing of various services, the communication processor module is responsible for establishing a communication link and packaging the services, the memory module is mainly used for storing and executing data and codes, the voice module is used for receiving and transmitting voice data,
Step 6): the method comprises the following steps of establishing a BT/WIFI module, wherein the BT/WIFI module adopts a BT/WIFI module LBEE5KL1DX of MURATA company, and the BT/WIFI module LBEE5KL1DX supports WIFI 802.11 b/g/n and Bluetooth v 4.1;
step 7): the key module is configured, the key module adopts 20 independent physical keys and is realized by adopting an extended GPIO chip, the chip adopts an AW9523B chip of Shanghai AWINIC company, and an I2C protocol is adopted to control the AW9523B chip and is extended to 16 paths of GPIO interfaces;
Step 8): the LCD module is designed, the LCD module adopts a Shenzhen Laoyou electronic TFT module with the model of SX177QQVGA101, and the TFT module adopts an SPI communication mode to carry out STM32 control and data transmission;
step 9): the SIM card module is designed, and supports an SIM card seat integrated with 2 NANO models for matching the communication requirements of two different modes of satellite communication and GSM mobile communication;
step 10): the level conversion module is configured and integrated with a level conversion chip TXB0104 and a level conversion chip TXS0104E of the TI. The level shift chip TXB0104 is used for level shift of a common IO port, and the level shift chip TXS0104E is used for level shift of an I2C protocol.
preferably, the power supply part adopts the sub-modules to independently supply power, the adopted LP3923 chip provides 8 different LDO power supply modes, and the output size of the LDO is controllable.
preferably, the charging part adopts a BQ24259 charging management chip of TI company to support the process control of complete charging.
the invention provides a mobile phone satellite communication method based on an STM32 platform, which adopts an STM32F427 platform, supports all ARM single-precision data processing instructions and data types based on a floating point unit with the core operation frequency of a high-performance ARM CORTEX-M432-bit simplified instruction set up to 180MHz and a CORTEX-M4 core function, and further realizes a complete set of digital signal processing instructions (DSP) and a Memory Protection Unit (MPU), thereby improving the safety of mobile phone satellite communication application programs; the hand-held terminal system based on the STM32 platform can realize the mobile phone communication function and support the free switching between the satellite communication mode and the traditional GSM mobile communication module.
the invention can be applied in light of the above description.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A mobile phone satellite communication method based on an STM32 platform is characterized in that an STM32F427 chip platform design is adopted, and the method comprises the following steps:
Step 1): the STM32F427 chip terminal body is built, and the STM32F427 chip terminal body is integrated with a storage system, a power supply network, an audio system, a core module, a BT/WIFI module, a key module, an LCD module, an SIM card module and a level conversion module which are mutually communicated and connected;
Step 2): the method comprises the steps that a storage system of the mobile phone is constructed by combining a body memory and an external TF card, wherein the body memory adopts an MX69GL642E chip of MXIC electronics, and the MX69GL642E chip is integrated with a NOR FLASH + RAM of high-speed data transmission; the external TF card is accessed to the ideographic semiconductor STM32 through an SPI interface to support mobile phone storage expansion;
Step 3): the method comprises the following steps of establishing a power supply network, wherein the power supply network is composed of a power supply part and a charging part, the power supply part adopts an LP3923 chip of a TI company, and the charging part adopts a BQ24259 chip of the TI company;
Step 4): the audio system is constructed, the audio system adopts an LM49350 chip of TI as an audio coding and decoding chip, and the audio system is integrated with a satellite communication and GSM communication voice module, a Bluetooth (BT) voice module and a multimedia playing module;
The satellite communication and GSM communication voice module adopts a PCM data transmission mode, and data are processed by MODEM and then transmitted to an audio CODEC chip for AD/DA conversion and transmitted to a sounding device for playing;
the Bluetooth (BT) voice module transmits a radio frequency voice signal to the Bluetooth module in a PCM data transmission mode, and transmits the radio frequency voice signal to the Bluetooth device for playing after being received and transmitted by the Bluetooth module;
step 5): the method comprises the following steps of building a core module, wherein the core module comprises an AP application processor module, a memory, a CP satellite communication module, a GSM mobile communication module and a voice module;
The AP application processor module is responsible for carrying out logic processing on various services, the communication processor module is responsible for establishing a communication link and packaging the services, the memory module is mainly used for storing and executing data and codes, and the voice module is used for receiving and transmitting voice data;
Step 6): the method comprises the following steps of establishing a BT/WIFI module, wherein the BT/WIFI module adopts a BT/WIFI module LBEE5KL1DX of MURATA company, and the BT/WIFI module LBEE5KL1DX supports WIFI 802.11 b/g/n and Bluetooth v 4.1;
Step 7): the key module is configured, the key module adopts 20 independent physical keys and is realized by adopting an extended GPIO chip, the chip adopts an AW9523B chip of Shanghai AWINIC company, and an I2C protocol is adopted to control the AW9523B chip and is extended to 16 paths of GPIO interfaces;
Step 8): the LCD module is designed, the LCD module adopts a Shenzhen Laoyou electronic TFT module with the model of SX177QQVGA101, and the TFT module adopts an SPI communication mode to carry out STM32 control and data transmission;
step 9): the SIM card module is designed, and the SIM card module supports and integrates 2 NANO-type SIM card seats which are used for matching the communication requirements of two different modes of satellite communication and GSM mobile communication;
Step 10): the level conversion module is configured, the level conversion module is integrated with a level conversion chip TXB0104 and a level conversion chip TXS0104E of the TI, the level conversion chip TXB0104 is used for level conversion of a common IO port, and the level conversion chip TXS0104E is suitable for level conversion of an I2C protocol.
2. The STM32 platform-based mobile phone satellite communication method according to claim 1, wherein the power supply part adopts sub-modules for independent power supply, an LP3923 chip is adopted for providing 8 different LDO power supply modes, and the output of the LDO is controllable.
3. the STM32 platform-based mobile phone satellite communication method according to claim 1, wherein the charging part adopts a BQ24259 charging management chip of TI company to support complete charging process control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711430326.8A CN108200230B (en) | 2017-12-26 | 2017-12-26 | mobile phone satellite communication method based on STM32 platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711430326.8A CN108200230B (en) | 2017-12-26 | 2017-12-26 | mobile phone satellite communication method based on STM32 platform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108200230A CN108200230A (en) | 2018-06-22 |
| CN108200230B true CN108200230B (en) | 2019-12-13 |
Family
ID=62584145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711430326.8A Active CN108200230B (en) | 2017-12-26 | 2017-12-26 | mobile phone satellite communication method based on STM32 platform |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108200230B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111199731A (en) * | 2019-11-27 | 2020-05-26 | 深圳市科尚通信有限公司 | Intelligence bicycle bluetooth pronunciation mutual equipment |
| CN110989472A (en) * | 2019-12-30 | 2020-04-10 | 威创集团股份有限公司 | Equipment and method for being compatible with different level standards |
| CN111669718A (en) * | 2020-06-19 | 2020-09-15 | 天通畅达(深圳)科技有限公司 | Mobile information interaction system based on multiple wireless communication channels |
| CN113242079B (en) * | 2021-04-20 | 2023-03-28 | 中国电子科技集团公司第五十四研究所 | Terminal based on satellite broadband data communication |
| CN113242081B (en) * | 2021-04-20 | 2023-03-28 | 中国电子科技集团公司第五十四研究所 | Intelligent terminal based on satellite communication |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202059413U (en) * | 2011-05-27 | 2011-11-30 | 杭州电子科技大学 | Self-contained data multichannel transmission terminal device of iridium satellite |
| CN102693726A (en) * | 2012-05-25 | 2012-09-26 | 福建英特莱信息技术咨询有限公司 | Beidou satellite communication equipment with voice recognition function |
| CN103344975A (en) * | 2013-07-02 | 2013-10-09 | 浙江水利水电学院 | Ship-mounted positioning device based on Beidou positioning and iridium communication |
| CN105812047A (en) * | 2016-03-09 | 2016-07-27 | 南京六九零二科技有限公司 | WIFI communication device based on Beidou satellite |
| CN106128035A (en) * | 2016-06-30 | 2016-11-16 | 西安工程大学 | The geological disaster forecasting method merged based on neutral net and multi-parameter information |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6580921B1 (en) * | 1997-03-04 | 2003-06-17 | Mitsubishi Denki Kabushiki Kaisha | Dual-mode mobile telephone terminal |
| CN202548332U (en) * | 2012-04-10 | 2012-11-21 | 成都亿盟恒信科技有限公司 | Portable GPS (Global Position System) vehicle-mounted terminal with LCD (Liquid Crystal Display) screen |
| CN104168056B (en) * | 2014-09-01 | 2018-07-06 | 四川灵通电讯有限公司 | A kind of satellite communication terminal based on Andriod operating systems |
| CN104614745A (en) * | 2015-01-29 | 2015-05-13 | 陕西强星信息科技有限公司 | Intelligent electronic wristwatch based on Beidou positioning |
| CN106296055A (en) * | 2015-05-27 | 2017-01-04 | 深圳中集智能科技有限公司 | Equipment intelligent terminal and communication mode adaptive method for switching thereof |
-
2017
- 2017-12-26 CN CN201711430326.8A patent/CN108200230B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202059413U (en) * | 2011-05-27 | 2011-11-30 | 杭州电子科技大学 | Self-contained data multichannel transmission terminal device of iridium satellite |
| CN102693726A (en) * | 2012-05-25 | 2012-09-26 | 福建英特莱信息技术咨询有限公司 | Beidou satellite communication equipment with voice recognition function |
| CN103344975A (en) * | 2013-07-02 | 2013-10-09 | 浙江水利水电学院 | Ship-mounted positioning device based on Beidou positioning and iridium communication |
| CN105812047A (en) * | 2016-03-09 | 2016-07-27 | 南京六九零二科技有限公司 | WIFI communication device based on Beidou satellite |
| CN106128035A (en) * | 2016-06-30 | 2016-11-16 | 西安工程大学 | The geological disaster forecasting method merged based on neutral net and multi-parameter information |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108200230A (en) | 2018-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108200230B (en) | mobile phone satellite communication method based on STM32 platform | |
| CN108347716B (en) | Bluetooth communication system and communication method | |
| CN103067071A (en) | Method and system for communication between mobile terminal and beidou communication satellite | |
| CN102253395A (en) | Communicator applied to Beidou satellites and method thereof | |
| CN111510196B (en) | Space-based search and rescue system based on Lora technology | |
| CN104052539A (en) | Method and device for satellite communication of smart phones through Beidou terminals | |
| CN212231504U (en) | Smart phone based on big dipper short message | |
| WO2018094875A1 (en) | Information processing method, positioning chip, and mobile terminal | |
| CN202014247U (en) | Communicator applied to Beidou satellite | |
| CN203761393U (en) | Satellite communication access router terminal | |
| CN108288994B (en) | Take big dipper multi-card communication location pronunciation equipment of WIFI function | |
| CN103731194A (en) | Emergency-meeting wireless communication system and method | |
| CN115734303A (en) | Method and related device for switching network | |
| CN111373709B (en) | Terminal pairing method, server and terminal | |
| CN204795008U (en) | Visitor fixes a position communication device | |
| CN104062890A (en) | Big Dipper watch | |
| CN208079068U (en) | Heaven communication device | |
| CN203385423U (en) | Vehicle-mounted navigation system based on Bluetooth push to talk | |
| CN103327657A (en) | Portable mobile terminal based on BeiDou communication and mobile communication | |
| CN203180927U (en) | Beidou satellite based communication terminal equipment | |
| CN103327191B (en) | Based on ZigBee-network coherent system and the mobile phone mobile monitor method of voice communication | |
| CN202149941U (en) | User terminal applied to Big Dipper satellite navigation system | |
| CN107276625A (en) | Intelligent terminal adapter, system and control method | |
| CN205827129U (en) | SOS based on Big Dipper generation satellite navigation system automatic time service intelligent watch | |
| CN208143501U (en) | A kind of on-vehicle positioning terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |