CN111356095A - Beidou short message sharing terminal and Beidou short message receiving and sending method - Google Patents
Beidou short message sharing terminal and Beidou short message receiving and sending method Download PDFInfo
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- CN111356095A CN111356095A CN202010079760.1A CN202010079760A CN111356095A CN 111356095 A CN111356095 A CN 111356095A CN 202010079760 A CN202010079760 A CN 202010079760A CN 111356095 A CN111356095 A CN 111356095A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
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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
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
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- 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
- H04B7/1851—Systems using a satellite or space-based relay
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Abstract
The invention relates to a Beidou short message sharing terminal and a Beidou short message receiving and sending method. The purchasing, operation and maintenance costs are reduced by using the same shared terminal by multiple users, and the use efficiency of the Beidou short message satellite terminal is improved.
Description
Technical Field
The invention relates to the technical field of Beidou short message terminal sharing use terminals, in particular to a Beidou short message sharing terminal and a Beidou short message receiving and sending method.
Background
The Beidou second satellite navigation system (BD2, Beidou-2) is a global satellite navigation system independently developed in China. By the end of 2012, 14 satellites currently serve the asia-pacific region, including 5 GEO satellites, 5 IGSO satellites, and 4 MEO satellites. Wherein, the Beidou No. 5 GEO satellites provide a short message communication function, and other satellites provide a navigation positioning function. And 5 GEO satellites, wherein each satellite comprises 2 independent beam signals, namely 10 independent beam signals provide short message communication service.
The Beidou third project is formally started and built in 2009, and a Beidou third satellite navigation system space section consists of 27 medium earth orbit satellites, 5 synchronous orbit satellites and 3 inclined synchronous orbit satellites and provides service for the whole world. By 6 months in 2019, currently, 21 Beidou No. three orbiting satellites are available, and the global service is formally provided at the end of 2020. The Beidou III mainly provides main services such as basic navigation service, short message communication service (regional and global), satellite-based augmentation service, international search and rescue service, precise single-point positioning service and the like.
The short message communication services of the first Beidou, the second Beidou and the third Beidou all provide military services and civil services. And for the civil service terminal, the network access management is carried out in a Beidou user card mode. The Beidou short message satellite communication terminal is relatively complex in design and implementation, and the terminal purchasing cost is high. For certain specific occasions, such as each person or each unit is provided with one Beidou short message satellite communication device, the cost is high, and the erection difficulty is high. In addition, the satellite communication is characterized in that the equipment antenna unit is required to be in a good open sky-to-sky environment, so that the Beidou short message cannot be used for communication in many places such as indoors, in ships or sheltered by the sky.
Disclosure of Invention
Aiming at the problems of high purchasing cost and high requirement on erection of an empty environment of the conventional Beidou short message satellite communication equipment, the invention aims to provide a Beidou short message sharing terminal and a Beidou short message receiving and sending method, so that the use efficiency of the Beidou short message satellite terminal is improved, the purchasing and operation maintenance cost is reduced, and the sharing of the Beidou short message terminal used by multiple users and multiple scenes is realized.
In order to achieve the purpose, the invention provides a Beidou short message sharing terminal which comprises a Beidou short message module, a control module and a communication interface module;
the Beidou short message module is used for realizing short message communication between the control module and the Beidou satellite;
the communication interface module comprises various types of communication interfaces;
the control module carries out data interaction with terminal equipment of a user through the communication interface module, and the user can send and receive the Beidou short message through the Beidou short message sharing terminal.
Furthermore, the communication interface module comprises a wired network, a WIFI AP and a Bluetooth wireless communication interface module.
Further, the Beidou short message module comprises an S frequency point receiving passive antenna, an S frequency point low-noise amplification circuit, an S frequency point down-conversion circuit, an L frequency point transmitting passive antenna, an L frequency point power amplification circuit, an L frequency point up-conversion circuit and a Beidou short message baseband digital circuit; the Beidou satellite signal acquisition and tracking system comprises an S frequency point receiving passive antenna, an S frequency point low-noise amplifying circuit, an S frequency point down-conversion circuit, a Beidou short message baseband digital circuit, a Beidou satellite signal acquisition and tracking circuit, a Beidou short message baseband digital circuit and a Beidou short message decoding circuit, wherein the S frequency point receiving passive antenna receives radio frequency signals transmitted by the Beidou satellite, the radio frequency signals are amplified through the S frequency point low-noise amplifying circuit, are converted into digital intermediate frequency signals after down-conversion is carried out through the; the control module transmits Beidou short message baseband signals to be transmitted to the L frequency point up-conversion circuit, and the L frequency point up-conversion circuit up-converts the baseband signals, amplifies the baseband signals by the L frequency point power amplification circuit and transmits the baseband signals to the north-fighting satellite through the L frequency point transmitting passive antenna.
Furthermore, the L frequency point power amplifier selects a 5-watt power amplification circuit by default, and the power amplification circuit can support a range of 5-30 watts according to requirements.
Further, after receiving a request message for sending a Beidou short message satellite, the control module sends a feedback instruction to the terminal device through the communication interface module, presses the short message to be sent into a queue to be sent, sends Beidou short message data to be sent in the queue at regular time according to the sending frequency limit of the Beidou short message, removes the message in the queue to be sent after the sending is successful, sends a Beidou short message sending success feedback instruction to the terminal device, and informs that the message is sent to the Beidou satellite for transfer.
Further, after the message in the queue to be sent is sent, the control module detects whether a new message to be sent comes in the queue to be sent at regular time, and if new data enters the queue to be sent, the message is sent at regular time according to the limitation of the sending frequency of the Beidou short message satellite. The time of the timing transmission is defaulted to 60 seconds.
Further, the Beidou short message module transmission frequency F is as follows:
F＝MAX((A/C),B)
wherein A is the frequency of the Beidou short message Beidou card; b is the frequency of whether the queue is empty or not; c, designing the number of cards supported by the short message module; the sending duration E is:
E＝(D*F)
and D is the number of Beidou short messages to be transmitted.
The invention also provides a method for realizing the receiving and sending of the Beidou short message by the Beidou short message sharing terminal, which is characterized by comprising the following steps:
the process of sending the Beidou short message comprises the following steps:
a user sends a request message sent by a Beidou short message satellite to the singlechip control module through the communication interface module by terminal equipment;
the control module sends a feedback instruction to the terminal equipment through the communication interface module to inform the Beidou short message sharing terminal that the request message is received;
the control module presses the short message to be sent into a queue to be sent, regularly sends Beidou short message data to be sent in the queue according to the sending frequency limit of the Beidou short message, eliminates the message in the queue to be sent after the data is successfully sent, sends a Beidou short message sending success feedback instruction to the terminal equipment, and informs that the message is sent to a Beidou satellite for transfer;
the process of receiving the Beidou short message comprises the following steps:
after receiving a Beidou short message sent by a Beidou satellite, the control module finds an address mapping relation according to the protocol definition of message content and selects terminal equipment to be forwarded; the control module detects whether the terminal equipment to be forwarded is on line, and if so, the control module forwards the Beidou short message satellite message to the terminal equipment; if the Beidou short message is not on line, the control module caches the Beidou short message until the external terminal equipment to be forwarded is found to be on line, and then forwards the Beidou short message to the terminal equipment.
Further, after receiving the beidou short message, the external terminal device for forwarding sends a received feedback instruction to the control module, and if the control module does not receive the feedback instruction within a set time, the control module resends the beidou short message. The time of the timing transmission is defaulted to 1 second.
Further, the Beidou short message module transmission frequency F is as follows:
F＝MAX((A/C),B)
wherein A is the frequency of the Beidou short message Beidou card; b is the frequency of whether the queue is empty or not; c, designing the number of cards supported by the short message module; the sending duration E is:
E＝(D*F)
and D is the number of Beidou short messages to be transmitted.
The technical scheme of the invention has the following beneficial technical effects:
(1) according to the invention, through integrating the Beidou short message module, the wired network interface module, the WIFI AP module, the Bluetooth wireless module and other communication interfaces and through specific program design, a user can conveniently access the sharing terminal in various modes, the user does not need to be in an environment convenient for Beidou communication, the limitation of the environment is avoided, and the use problem of multiple users and multiple scenes is effectively solved.
(2) The purchasing, operation and maintenance costs are reduced by using the same shared terminal by multiple users, and the use efficiency of the Beidou short message satellite terminal is improved.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a block diagram of a Beidou short message module implementation of the present invention;
FIG. 3 is a Beidou short message satellite data transmission flow of the invention;
FIG. 4 is a Beidou short message satellite data receiving process of the present invention;
FIG. 5 is a block diagram of a Beidou short message module with multiple cards.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The Beidou short message sharing terminal is similar to a Beidou short message satellite equipment server in implementation, and provides a Beidou short message satellite communication service function for peripheral terminal individuals through professional hardware and program design in a sharing box mode.
As shown in fig. 1, the beidou short message sharing terminal of the present invention includes a beidou short message module, a single-chip microcomputer control module, and various peripheral communication interface modules. The single chip microcomputer control module is a core controller of the Beidou short message sharing terminal and is responsible for communicating the Beidou short message module with the peripheral communication interface module. The peripheral communication interface module is used for interacting data with a user, and comprises a plurality of communication modes, for example, interface modules such as a wire network, a WIFI AP and Bluetooth wireless communication can be arranged.
The WIFI AP interface module can be integrated in the Beidou short message sharing terminal, supports a mobile phone, a PAD and other devices with WIFI functions to be connected into the Beidou short message sharing terminal, and after the external WIFI terminal is connected with the Beidou short message sharing terminal, Beidou short message satellite information to be sent is sent to the Beidou short message sharing terminal first, and the Beidou short message satellite information is sent to a Beidou satellite through the Beidou short message sharing terminal. In one embodiment, the user is communicated with the Beidou short message sharing terminal through a wired network interface module. And the client accessing the system local area network can send the Beidou short message to be sent to the Beidou short message sharing terminal through the wired network, and the Beidou short message sharing terminal sends the satellite short message to the Beidou satellite.
As shown in fig. 2, the big dipper short message module is used for realizing short message digital communication with the big dipper satellite, and includes an S-frequency point receiving passive antenna, an S-frequency point low-noise amplifying circuit, an S-frequency point down-conversion circuit, an L-frequency point transmitting passive antenna, an L-frequency point power amplifying circuit, an L-frequency point up-conversion circuit, and a big dipper short message baseband digital circuit. The Beidou short message module provides interactive communication with the Beidou satellite and is connected with the single chip microcomputer controller through the TTL serial port. The S frequency point receiving passive antenna receives radio frequency signals transmitted by the Beidou satellite, the radio frequency signals are amplified through the S frequency point low-noise amplifying circuit, the radio frequency signals are converted into digital intermediate frequency signals after being subjected to down-conversion through the S frequency point down-conversion circuit, the signals are captured, tracked, decoded and analyzed through the Beidou short message baseband digital circuit, Beidou short messages transmitted by the Beidou satellite are obtained, and the Beidou short messages are transmitted to corresponding users through the singlechip control module. The singlechip control module transmits Beidou short message baseband signals to be transmitted to the L frequency point up-conversion circuit, and the L frequency point up-conversion circuit up-converts the baseband signals, amplifies the baseband signals by the L frequency point power amplification circuit and transmits the baseband signals to the north-fighting satellite through the L frequency point transmitting passive antenna.
Furthermore, the L frequency point power amplifying circuit can adjust the transmitting power of the L frequency point according to the strength of the received signal, so that the automatic transmitting power control is achieved, the communication success rate is ensured, and meanwhile, the transmitting power consumption is also saved.
In one embodiment, the Beidou short message module preferentially selects a 5-watt power amplification circuit in the selection of the L-frequency point power amplifier, so that the battery requirement on the Beidou short message sharing terminal is reduced, and the complexity of a power circuit is reduced.
As shown in fig. 3, the process of sending the beidou short message through the beidou short message sharing terminal includes: the external terminal equipment sends a request message sent by the Beidou short message satellite to the singlechip control module through the wired network interface module, the WIFI AP, the Bluetooth or other interfaces; the singlechip control module sends a feedback instruction to the external terminal through the peripheral communication interface module to inform the Beidou short message sharing terminal that the message is received; the singlechip control module presses the short message to be sent into a queue to be sent; the single chip microcomputer control module sends Beidou short message data to be sent in the queue at regular time according to the sending frequency limit of the Beidou short message, and after the Beidou short message data is sent successfully, the single chip microcomputer control module sends a Beidou short message sending success feedback instruction to external terminal equipment. And informing that the message is sent to the Beidou satellite for transfer.
Furthermore, the Beidou short message module is designed by considering the frequency limit of 60 seconds of the Beidou short message and combining a public transmitting antenna, an up-conversion circuit and a power amplifier circuit, and can be designed to support 600 Beidou card users, so that the communication bandwidth and the efficiency are greatly improved, and meanwhile, the manufacturing cost is increased very little.
Further, the frequency of the Beidou short message user card is defined to be A seconds. The default of the common civil card is 60 seconds, namely, the civil card can be transmitted once in 60 seconds and cannot be transmitted in an overclocking manner.
The frequency of whether the queue is empty or not is defined as B seconds, and the fastest frequency of the Beidou short message user card is 1 second, so that B is set as 1 second.
After the queue to be sent is sent, the single chip microcomputer detects whether a new message to be sent comes into the sending queue or not at the frequency of 1 second, if new data is sent to enter the queue to be sent, the big dipper short message module sends the data to be sent out in combination with the limitation of the sending frequency of the big dipper short message satellite when the sending time reaches A seconds. The queue to be transmitted performs a transmission process of cyclically detecting whether the queue is empty and limiting the frequency by A seconds, wherein the frequency is 1 second.
Further, as shown in fig. 5, since the transmission frequency of the big dipper short message satellite is once every 60 seconds, in order to increase the faster service frequency and bandwidth, the big dipper short message module in the big dipper short message sharing terminal can support the design of big dipper multiple cards in design.
Further, when a big dipper short message is sent, the continuous working time of the power amplifier is about 100 ms. By combining the requirement of 60s on transmission frequency, the Beidou short message module can theoretically support 600 Beidou card users. The heat dissipation of the power amplifier and the processing pressure of the single chip microcomputer are considered, and the maximum design can be optimized into 300 users in a folding mode.
Furthermore, the number of cards supported by the design of the Beidou short message module is defined to be C. And defining the number of Beidou short messages to be transmitted as D. And E is defined as how long the Beidou short message can be completely transmitted to the satellite.
And F is defined as the final frequency of transmission.
If (a/C) < B, F ═ B;
if (A/C) > < B, F is A/C
Namely:
F＝MAX((A/C),B)；
E＝(D*F)
let a be 60 seconds; c-300; b is 1 second; and D is 1000.
Then:
f is 1 second;
and E is 1000 seconds, namely 1000 seconds are needed to transmit 1000 Beidou short message messages to the satellite.
Let a be 60 seconds; c-300; b is 0.01 second; and D is 1000.
F is 0.2 seconds;
e is 200 seconds; namely, the method needs 200 seconds to be capable of transmitting 1000 Beidou short message messages to the satellite. As shown in fig. 4, the process of receiving the beidou short message through the beidou short message sharing terminal includes: the Beidou short message sharing terminal receives Beidou short message information sent by a Beidou satellite, and the single chip microcomputer control module finds an address mapping relation according to the protocol definition of the information content and selects external terminal equipment to be forwarded. Further, the single chip microcomputer control module detects whether the external terminal device is on line, and if the external terminal device is on line, the single chip microcomputer control module forwards the Beidou short message satellite message to the external terminal. And after receiving the Beidou short message, the external terminal equipment sends a received feedback instruction to the Beidou short message sharing terminal, and after 3 seconds, the external terminal equipment does not receive the feedback instruction and retransmits the feedback instruction. Further, if the external terminal is not on line, the single chip microcomputer control module caches the Beidou short message until the external terminal device is found to be on line, and then executes the Beidou short message forwarding function. Whether the terminal is online or not can design a heartbeat protocol of an external terminal and a Beidou short message sharing terminal, the heartbeat protocol can be set to be 1 second or 5 seconds in frequency to send heartbeat signals, and the heartbeat signals sent by the terminal equipment can be received by the terminal equipment connected through Bluetooth, WIFI, wires and the like.
Furthermore, considering the success rate of Beidou communication transmission and reducing power consumption, the power of the transmitting circuit is designed according to 10 watts by default, when a received signal is strong, the transmitting circuit can transmit according to the minimum transmitting power of 5 watts, and when the received signal is weak, the transmitting circuit can transmit according to the maximum power of 10 watts.
Furthermore, the strength range of the received signal of the Beidou short message is 0-4, 0 is no signal, and 4 is the strongest signal. When the received signal is 1 lattice (weak), the corresponding transmitting power is 10 watts; when the received signal is 2 grids (weak), the corresponding transmitting power is 8 watts; when the received signal is 3 grids (normal), the corresponding transmitting power is 6 watts; when the received signal is 4 grids (strong), the corresponding transmitting power is 5 watts; and correspondingly, the power output of the power amplifier of the Beidou short message can be controlled through the GPIO of the single chip microcomputer controller and the numerical control attenuator.
When the Beidou signal transmission power automatic control circuit is used, the communication success rate is ensured, and meanwhile, the transmission power consumption is also saved. In conclusion, the Beidou short message sharing terminal provided by the invention effectively solves the problem of multi-user and multi-scene use, improves the use efficiency of the Beidou short message satellite terminal, and reduces the purchasing, operating and maintaining costs.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A Beidou short message sharing terminal is characterized by comprising a Beidou short message module, a control module and a communication interface module;
the Beidou short message module is used for realizing short message communication between the control module and the Beidou satellite;
the communication interface module comprises various types of communication interfaces;
the control module carries out data interaction with terminal equipment of a user through the communication interface module, and the user can send and receive the Beidou short message through the Beidou short message sharing terminal.
2. The Beidou short message sharing terminal according to claim 1, wherein the communication interface module comprises a wired network, a WIFI AP and a Bluetooth wireless communication interface module.
3. The Beidou short message sharing terminal according to claim 1 or 2, wherein the Beidou short message module comprises an S frequency point receiving passive antenna, an S frequency point low noise amplification circuit, an S frequency point down conversion circuit, an L frequency point transmitting passive antenna, an L frequency point power amplification circuit, an L frequency point up conversion circuit and a Beidou short message baseband digital circuit; the S frequency point receiving passive antenna receives a radio frequency signal transmitted by the Beidou satellite, the radio frequency signal is amplified through the S frequency point low-noise amplifying circuit, the radio frequency signal is converted into a digital intermediate frequency signal after being subjected to down-conversion through the S frequency point down-conversion circuit, and a Beidou short message transmitted by the Beidou satellite is obtained after signal capturing, tracking, decoding and analyzing are carried out through the Beidou short message baseband digital circuit; the control module transmits a Beidou short message baseband signal to be transmitted to the L frequency point up-conversion circuit, and the L frequency point up-conversion circuit up-converts the baseband signal, amplifies the baseband signal by the L frequency point power amplification circuit and transmits the baseband signal to the north-fighting satellite through the L frequency point transmitting passive antenna.
4. The Beidou short message sharing terminal according to claim 3, wherein the L frequency point power amplifier selects a power amplifying circuit of 5-30W, and the Beidou short message module can support 600 Beidou card users.
5. The Beidou short message sharing terminal according to claim 1 or 2, wherein the control module sends a feedback instruction to the terminal equipment through the communication interface module after receiving a Beidou short message satellite sending request message, presses the short message to be sent into a queue to be sent, sends Beidou short message data to be sent in the queue at regular time according to the Beidou short message sending frequency limit, clears the message in the queue to be sent after the Beidou short message is sent successfully, sends a Beidou short message sending success feedback instruction to the terminal equipment, informs that the message has been sent to the Beidou satellite, and transfers the message.
6. The Beidou short message sharing terminal according to claim 1 or 2, wherein after the transmission of the message in the queue to be transmitted is completed, the control module periodically detects whether a new message to be transmitted comes in the queue to be transmitted, if new data enters the queue to be transmitted, the message is periodically transmitted according to the Beidou short message satellite transmission frequency limit. The time of the timing transmission is 1 second.
7. The Beidou short message sharing terminal according to claim 5, wherein the Beidou short message module transmission frequency F is:
F＝MAX((A/C),B)
wherein A is the frequency of the Beidou short message Beidou card; b is the frequency of whether the queue is empty or not; c, designing the number of cards supported by the short message module; the sending duration E is:
E＝(D*F)
and D is the number of Beidou short messages to be transmitted.
8. A method for realizing Beidou short message receiving and sending by the Beidou short message sharing terminal of any one of claims 1 to 7 is characterized in that:
the process of sending the Beidou short message comprises the following steps:
a user sends a request message sent by a Beidou short message satellite to the singlechip control module through the communication interface module by terminal equipment;
the control module sends a feedback instruction to the terminal equipment through the communication interface module to inform the Beidou short message sharing terminal that the request message is received;
the control module presses the short message to be sent into a queue to be sent, regularly sends Beidou short message data to be sent in the queue according to the sending frequency limit of the Beidou short message, eliminates the message in the queue to be sent after the data is successfully sent, sends a Beidou short message sending success feedback instruction to the terminal equipment, and informs that the message is sent to a Beidou satellite for transfer;
the process of receiving the Beidou short message comprises the following steps:
after receiving a Beidou short message sent by a Beidou satellite, the control module finds an address mapping relation according to the protocol definition of message content and selects terminal equipment to be forwarded; the control module detects whether the terminal equipment to be forwarded is on line, and if so, the control module forwards the Beidou short message satellite message to the terminal equipment; if the Beidou short message is not on line, the control module caches the Beidou short message until the external terminal equipment to be forwarded is found to be on line, and then forwards the Beidou short message to the terminal equipment.
9. The method according to claim 8, wherein the external terminal device that performs forwarding sends a received feedback command to the control module after receiving the beidou short message, and if the control module does not receive the feedback command within a set time, the control module resends the beidou short message. The time of the timing transmission is 1 second.
10. The method for realizing the Beidou short message receiving and sending according to claim 8 or 9, wherein the Beidou short message module transmitting frequency F is:
F＝MAX((A/C),B)
wherein A is the frequency of the Beidou short message Beidou card; b is the frequency of whether the queue is empty or not; c, designing the number of cards supported by the short message module; the sending duration E is:
E＝(D*F)
and D is the number of Beidou short messages to be transmitted.
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| CN113099551A (en) * | 2021-04-10 | 2021-07-09 | 北京太极疆泰科技发展有限公司 | Communication method based on self-adaptive Beidou communication node |
| CN113301517A (en) * | 2021-05-14 | 2021-08-24 | 北京天海达科技有限公司 | Terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages |
| CN113660617A (en) * | 2021-08-16 | 2021-11-16 | 广东省林业科学研究院 | Many-to-many mutual communication method for operator mobile phone number and Beidou terminal short message |
| CN116095620A (en) * | 2023-04-11 | 2023-05-09 | 北京北斗华大科技有限公司 | RDSS short message function realization system and method based on wireless network |
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