CN205071021U - Full duplex multiple access instant messaging terminal based on big dipper short message - Google Patents
Full duplex multiple access instant messaging terminal based on big dipper short message Download PDFInfo
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Abstract
The utility model discloses a full duplex multiple access instant messaging terminal based on big dipper short message. This terminal includes voice processing module, control module and big dipper communication module, wherein, voice processing module and control module are connected, and control module and big dipper communication module are connected, big dipper communication module is including having the big dipper baseband processing module of short message communication function, many calories of management module, radio frequency module and antennas, the antenna warp radio frequency module with big dipper baseband processing module is connected, many calories of management module with big dipper baseband processing module is connected, big dipper baseband processing module is connected with a big dipper SIM card that is used for data to receive, many calories of management module are connected with a plurality of data transmission's of being used for big dipper SIM card. The utility model discloses can realize instantaneity, multiple access and full duplex communication.
Description
Technical field
The utility model relates to a kind of full duplex multiple access instant messaging (comprising the information formats such as voice, short message, picture, text) terminal based on Big Dipper short message, belongs to communication technical field.
Background technology
Dipper system is satellite fix and the navigation system of China's independent research.From 27 days December in 2011, Beidou satellite navigation system started the trial run service providing continuous print navigator fix and time service service to China and surrounding area.And in November, 2014, dipper system is incorporated Global Radio Navigation System by linked groups of the United Nations, become the marine satellite navigation system of the 3rd united state accreditation after GPS of America and Russian Glonass.
Dipper system is except location and time service function, and the SMS communication function possessed is that the system such as GPS and GLONASS is unexistent.Rear both address only my where orientation problem, and such as in desert or on ocean, and where dipper system not only solves me, also solve your his where problem here.At present, dipper system has played positive role in China's national defense construction and socio-economic development, support a Big Dipper generation and two generations associating navigator fix and the professional application field such as the product of communication service has been widely used in national defence, geology, electric power, communications and transportation, public safety, communicates, water conservancy, forestry, fishery, fire-fighting, public security, the disaster relief, be with a wide range of applications, the occasion that especially (as natural calamity) wireless cellular network cannot normally use under remote districts (covering as not having wireless cellular network) or emergency case.
Although the short message function of big-dipper satellite terminal communication device achieves two places communication, greatly facilitate user.But in actual applications, still there are the following problems in short message communication for the existing Beidou terminal user with short message function:
(1) instantaneity problem.Compared with phonetic entry, short message often bring operational inconvenience and time lag problem.Some special occasions of requirement (as sent the communication under the case of emergency such as short message or emergency relief in high-speed cruising) is had especially to seem important to the time.
(2) authenticity questions.Short message display be the Word message of transmit leg, do not show the true identity of originator.At some, confidentiality, reliability, authenticity, authority are required that very tight occasion is unfavorable.If what originator sent is an error message, bring unpredictalbe consequence to destination possibly.
(3) frequency and transmission byte limitation problem.Frequency restriction is there is because big-dipper satellite short message sends, namely to wait for a period of time after once having communicated (1 minute or 30 seconds etc.) could again communicate, the bit number of each communication is relevant with Big Dipper SIM card grade, there is the bit number upper limit, the most about 628 bits of general grade card, the most about 1680 bits of high-grade card, have certain difficulty to the transmission of the information such as long message, voice and picture.
Based on the problems referred to above, cause the concern of more domestic associated companies and user, start the discussion based on the communication means such as voice picture of Big Dipper short message and research.Recent associated companies and user have applied for utility model based on the voice communication of Big Dipper short message and utility model patent in succession, but these patents still do not solve the instantaneity of communication, multiple access and full duplex problem.
Utility model content
The purpose of this utility model is to solve the technical problem of existing Beidou communication terminal room instant messaging, multiple access communication and full-duplex communication, provides a kind of full duplex multiple access instant communication terminal based on Big Dipper short message.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
Based on a full duplex multiple access instant communication terminal for Big Dipper short message, it is characterized in that, comprise speech processing module, control module and Beidou communication module; Wherein,
Described speech processing module is connected with described control module, sends to described control module for gathering voice messaging and being converted into digital information, and the speech data that described control module sends over is converted to voice messaging plays;
Described control module and described Beidou communication model calling, for the described digital information received is sent to described Beidou communication module, and send to described speech processing module by the speech data that described Beidou communication module sends over;
Described Beidou communication module, comprises the Big Dipper baseband processing module with short message communication function, many card management modules, radio-frequency module and antenna; Described antenna is connected with described Big Dipper baseband processing module through described radio-frequency module, described many card management modules are connected with described Big Dipper baseband processing module, described Big Dipper baseband processing module is connected for the Big Dipper SIM card of data receiver with one, and described many card management modules are connected with some Big Dipper SIM card sent for data.
Described speech processing module comprises pick-up, loud speaker, voice D and D/A converter and low rate codec; Wherein, pick-up, loud speaker are connected with voice D and D/A converter respectively with low rate codec.
Further, described low rate codec is the hard coder of voice adopting 600bps or 400bps.
Further, described many card management modules comprise a microprocessor, and this microprocessor is connected with each Big Dipper SIM card sent for data respectively by I/O port.
Further, described speech processing module is connected by serial ports or USB port with described information processing control module, and described speech processing module is connected by serial ports or USB port with described Beidou communication module.
Further, described control module comprises Intelligent Human-Machine Interface.
Further, described control module is connected with peripheral function circuit, and described peripheral function circuit comprises GPS module, 2G module, 3G module, 4G module, Wifi module, bluetooth module, USB interface, SD card interface, power management module or sensor circuit.
This programme comprises data obtaining module, information processing and control module, and information transmission modular, thus realizes the instant messaging of Beidou communication terminal room, multiple access communication and full-duplex communication.
Data obtaining module comprises the multiple obtain manners such as voice, image, file, as voice obtain by terminal pick-up, image can adopt terminal camera to obtain, and file can adopt local editor etc., ben be the utility model mainly with the instant messaging of voice for utility model object.For reducing voice messaging time delay in the transmission and improving instantaneity and validity, the utility model, according to transmission quality and reliability requirement, adopts two kinds of methods to realize.First method is for the occasion of authenticity and high reliability, introduce voice ELF magnetic field (lower than 1.2kbps) coding and decoding technology, as adopted the hard codec module of the voice of 600bps or 400bps, these module application sinusoidal excitation linear prediction (SELP) innovatory algorithm or MELP voice compression coding (MELPe) algorithms etc., have higher voice quality.Analog voice becomes low bit-rate data flow through hard coded module condenses, then communicates with the form of Big Dipper short message, and the data flow received is input to hard decoding module by receiving terminal again, realizes the output of analog voice.Second method is for the less demanding occasion of authenticity, introduce off-line speech recognition technology, the data flow such as word or numeral is converted to by the identification of speech-to-text, communicate with the form of Big Dipper short message, at receiving terminal, the text received is carried out off-line phonetic synthesis and export synthesizing analog voice.The introducing of these two kinds of methods, can solve the situation that Beidou communication transmittability is limited, and makes the instantaneous transmission of voice become possibility.These two kinds of methods, except the acquisition of audio data stream is different with the way of output, are similar in control with transmission, and the utility model is illustrated as master mainly with first method.
Information processing mainly realizes processing and the process of information, and in general the capacity such as voice, picture and file is comparatively large, cannot utilize the disposable transmission of Big Dipper note, need a point multiple batches of time-sharing send, breaks and merges like this by the digital information of acquisition.Transmitting terminal needs the protocol format designed in case study on implementation by the utility model break to the digital information flow that will transmit and add header, and composition meets the short message form that Big Dipper agreement 4.0 specifies, receiving terminal needs the digital information frame to receiving identify and merge, and recovers former transmission information flow.Information controls, primarily of the input and output of core controller control information stream, to be undertaken showing and operate by man-machine interface, and the management blocked and scheduling more.The address number that Beidou communication terminal distribution one is unique, for distinguishing users different in a groups of users, thus solves the multiple access problem in groups of users.
Information transmission realizes primarily of Beidou communication module, and Beidou communication module and control module carry out information interaction by communication interface.For reducing propagation delay time and realizing full-duplex communication, the utility model adopts many cards to send and single deck tape-recorder receiving mode.Many cards refer to the situation of more than one Big Dipper SIM card, as two or more, can reach 20 at most, and specifically determined the card number inserted by the grade of SIM card and demand, many cartoons are crossed hardware and software and undertaken managing and dispatching by controller.When information sends by controller by meet downlink data upon handover that Big Dipper agreement 4.0 specifies in order by card time-sharing send to the Beidou communication receiving terminal of specifying.And single deck tape-recorder receives independent of sending link, the information of other terminal in the other side or same groups of users can be received while terminal sends information, realize duplex and multiple access function.The Frame that Beidou communication end-on is received distinguishes the different information sending user according to multiple access numbering, according to the time marking of Frame and the data of frame number differentiation different time, information re-transmission mechanism is introduced to information dropout problem, illustrates and see that case realizes part.
Compared with prior art, good effect of the present utility model is:
1) instantaneity and the validity of voice transfer is improve by voice low code rate coding and decoding method;
2) unified addressing is adopted to Beidou communication many cards terminal, achieve the multiple access communication of multi-user; 3) many card transmissions and single deck tape-recorder reception mechanism is adopted to achieve the duplex communication of transmission information, and the instantaneity of transmission; 4) introducing information re-transmission mechanism reduces and causes error of transmission and raising transmission quality because satellite channel is bad.
Above measure substantially increases the message transmission capability of Beidou communication terminal.
Accompanying drawing explanation
Fig. 1 is this terminal composition schematic diagram;
Fig. 2 is the software workflow figure of terminal;
Fig. 3 is command/data frame format figure;
Fig. 4 is that terminal sends workflow diagram;
Fig. 5 is that terminal receives workflow diagram.
Embodiment
Below for transmission of speech information also by reference to the accompanying drawings, as shown in Figure 1, embodiment of the present utility model is described.
The concrete case of the utility model is by speech processing module, control module, and Beidou communication module composition, wherein speech processing module is made up of pick-up, loud speaker, voice modulus (AD)/digital-to-analogue (DA) transducer and low rate codec, control module is made up of embedded controller (CPU), operating system and application software, man-machine interface circuit and peripheral function circuit etc., and Beidou communication module is by having the Big Dipper baseband processing module of short message communication function, many card management modules and corresponding radio-frequency module and antenna forms.Speech processing module and Beidou communication module carry out data interaction with control module by serial ports or USB port respectively.
Speech processing module in the utility model adopts the hard coder of voice to be described in instances.At present, along with the development of ultralow code check speech coder and decoder algorithm, domestic contrast maturation be 600bps encoder, as think much TR600, Nanjing Chinese parasol tree electronics WT600 and Shenzhen, Beijing steps and can be MA600-P1 etc.The utility model is not limited thereto, and all Codecs lower than 1.2kbps all belong in the scope of the utility model agreement.
In the utility model the core CPU of control module can adopt arm processor CortexA series or CortexM serial, or the microprocessor of other frameworks, as x86 and MIPS, its operating system can be selected as intelligent operating systems such as Android, AppleiOS, Windows8, BlackBerryOS, Ubuntu, or the real time operating systems such as μ C/OS-II, PalmOS, VxWorks, the utility model be not limited to above-mentioned listed by.In addition, this control module also comprises Intelligent Human-Machine Interface and other peripheral function circuit, Intelligent Human-Machine Interface realizes the display of information and the operation of user by touch-screen and button, other peripheral function circuit can include but not limited to GPS, 2G/3G/4G, Wifi/ bluetooth, USB interface and SD card interface, power management, and the sensor circuit such as humiture, electronic compass and acceleration.
In the utility model, Beidou communication module is by having the Big Dipper baseband processing module of short message communication function, many card management modules and corresponding radio frequency and antenna forms, and wherein radio-frequency module comprises Up/Down Conversion, LNA and power amplifier etc.Baseband processing module is connected by serial ports with many card management modules, performs specific communication protocol.Many card management modules are connected with multiple IC-card by I/O port respectively by low and middle-end microprocessor (as CortexM series processors or single-chip microcomputer etc.).IC-card quantity can be determined according to the actual requirements, selects corresponding microprocessor by required I/O interface number.The handoff algorithms of many cartoon news is controlled by baseband processing module, and many card management modules are responsible for realizing switching.Many cards handoff algorithms comprises initial phase and communication stage.
At initial phase, send initialization directive by baseband processing module to many card management modules after powering on, many card management modules start IC-card after receiving instruction and patrol and examine, and patrol and examine IC-card groove and whether install IC-card and Card Reader situation etc.If installed also, Card Reader is correct, by many card management modules, IC card information is turned back to baseband processing module, otherwise return without card information or error message, baseband processing module is feeding back to control module after the information specimens preserving received subsequently, show current I C card-like state by human interface applications program to user by control module and preserve, the prompting user of wrong information gives respective handling.After user is disposed according to the corresponding prompting of application program, initial phase terminates, and enters wait state.
In the communication stage, sending link can be divided into and receive link.In sending link, first control module sends to baseband processing module by Beidou communication agreement frame by frame the digital information after framing, baseband processing module sends communication instruction to many card management modules after receiving digital information, many card management modules activate according to the requirement in instruction and specify effective IC-card, and perform sending action, one frame one blocks, and presses frequency circulation frame by frame send by a point frame sequential.After IC-card sends respective frame information, many card management modules return response instruction to baseband processing module, and feed back to control module by baseband processing module.If send unsuccessfully, control module should pass through application prompts user the present situation, processes in time for user.In reception link, reception is responsible for owing to adopting independent IC-card, with general Beidou subscriber machine, there is similar receiving course, difference is that the information stream received in chronological order by baseband processing module is after control module, need control module to merge frame by frame the frame information received, after merging, present to user by related application, if frame information is lost have corresponding prompting, and send frame losing repeating transmission order, otherwise transmission correctly receives order.
Above-mentioned part of the present utility model can form portable terminal, vehicular or a fixed terminal on entity.
The design of audio data stream Communications Protocol Specification and software flow is described for transmission of speech information, first the workflow of terminal is described, then data or command frame format are defined, finally the information processing manner of transmitting terminal and receiving terminal is described.
Fig. 2 gives audio data stream handling process in system.First by speech processing module analog to digital conversion is carried out to voice signal and Low Bit-rate Coding forms low bit-rate data flow at transmitting terminal, then control module is sent to by serial ports or USB port, the cutting of data flow is carried out by control module, framing is carried out by data frame format, be sent to Beidou communication module finally by serial ports/USB port framing, sent by antenna by Beidou communication frequency by card circulation; First downlink data upon handover bag is received by Beidou communication module by antenna at receiving terminal, control module is sent to through serial ports, control module is by merging each framing after the frame check mode of agreement, the data flow merged sends to speech processing module to carry out low bit-rate decoding and digital-to-analogue conversion by control module by serial ports, finally exports analog voice.Owing to having considered data encrypting and deciphering problem in Beidou communication process, as needed superencipher, the design can add data encrypting and deciphering algorithm or module, is completed by control module, and its position as shown in Figure 2.
The utility model, except transmission real-time phonetic, also can transmit picture, file, message voice and message retransmission, and some acknowledgement commands.Therefore, here to the design of command/data frame format as shown in Figure 3, and be described as follows: it is Frame or command frame that command type is used for differentiation; Frame type is for distinguishing different communication patterns, and as real-time phonetic pattern, tone information module, common text pattern and information re-transmission pattern, picture, long message and file all can regard common text pattern as; Geocoding for distinguishing the different user (transmit leg) in same groups of users, to realize multiple access communication object; Time marking, for distinguishing the data flow do not generated in the same time, prevents multiple not subframe in the same time from causing dislocation because of system transfers delay etc., cannot merge; Totalframes refers to message bit stream that synchronization the generates totalframes by frame format cutting; The sequence number that frame number distributes after referring to the message bit stream framing that synchronization generates in order; Valid data refer to the pre-transmission information bit that this subframe comprises; Parity check bit refers to the check digit of all information bits of this frame, verifies whether this frame correctly transmits.In addition, under instant communication pattern, devise calling and acknowledgement command to ensure the instantaneity communicated to connect, all communication patterns devise the acknowledgement command of correctly reception, communicate successfully, otherwise transmission and reception are unsuccessfully ordered or information re-transmission order to point out.This programme introduces information re-transmission mechanism to solve the problem of seriously packet loss under adverse circumstances, determined by communication pattern and packet loss ratio for reducing Delay number of retransmissions, speech pattern require instantaneity and fault-tolerance all stronger, can be less according to packet loss ratio number of retransmissions, and the instantaneity of common text and fault-tolerance all require more weak, do not allow packet loss, number of retransmissions can be some more.
As shown in Figure 4, specific implementation step is as follows for the utility model dataframe flow scheme design:
(1) first judging to sent a point frame type, is the message information transmitting that type.If instant messaging pattern, call command be determined whether.If call command, then send call command, wait for that the other side responds, if receive the other side to respond, then enter step (2), otherwise after waiting for certain time-delay, the whether recall of prompting call failure, if not call command directly enters step (2).If common text or tone information pattern, then enter step (2).If message retransmission pattern, resends in order to lost frames, be sent, enter step (3).
(2) data framing is sent by card by transmission frequency, and count transmission times, if transmission times equals Frame sum, then enter step (3);
(3) wait for that the other side confirms, and trigger waits for certain hour.If receive the other side's response within the stand-by period, judge that the other side receives information correctly no, send successfully if correct order is then pointed out, if retransmit order then enter step (4).If do not receive the other side's response within the stand-by period, then whether prompting sends unsuccessfully, again send.If again send, proceed to step (1).
(4) judge whether retransmit accumulative frequency reaches regulation requirement, if reach, prompting sends unsuccessfully, whether again send, otherwise the sequence number of the information re-transmission order analysis lost frames according to the other side, lost frames are rearranged in order and prepares to retransmit, and accumulative number of retransmissions, then proceed to step (1).
As shown in Figure 5, specific implementation step is as follows for the utility model data frame receipt flow scheme design:
(1) first docking receipts message information carries out checking treatment, then judges text type.If real-time phonetic pattern, then determine whether call command, if then send confirming call order, otherwise enter step (2).If message voice or common text type, then enter step (2).If message retransmission type, then enter step (3);
(2) if (judge) data framing received for the first time according to transmitting terminal station address coding and time marking, according to frame overall length setting reception delay duration, preserve downlink data upon handover and accumulative frame reception number of times (repeat to receive and do not count), then whether judgment frame count value equals totalframes, if equal, transmission and reception are correctly ordered, prompting receives successfully, control module carries out merging treatment, otherwise judge that delay time is to no, if the time does not arrive, enter step (1), wait for and judge next frame data.If the time to; judge current lost frames quantity, if (XX represents frame losing ratio, for speech pattern, requires to determine according to voice quality to be less than or equal to totalframes XX%, if common text, generally do not allow frame losing, get XX=0), then transmission and reception are correctly ordered, control module carries out merging treatment, otherwise send information re-transmission order, and accumulative number of retransmissions, retransmit reception delay duration according to the setting of re-transmission frame number.
(3) first judge that retransmission delay time is to no, if do not arrive, enter step (1), wait-receiving mode process next frame data, if time delay to; calculate total frames received, (YY represent reception ratio, for speech pattern to judge whether be more than or equal to the YY% of totalframes by frames received, require to determine according to voice quality, if common text, does not generally allow frame losing, get YY=100); If be not less than, prompting receives successfully, otherwise judges whether number of retransmissions is regulation requirement.Require if number of retransmissions reaches regulation, prompting takes defeat and sends the order that takes defeat, and requires, send information re-transmission order if do not reach regulation, and accumulative number of retransmissions, retransmit reception delay duration according to the setting of re-transmission frame number.
Special instruction, above-mentioned to description of the present utility model, illustrate only preferred embodiment object of the present utility model, there is no whole features of detailed practical embodiments.It will be understood by a person skilled in the art that the utility model is not restricted to the described embodiments.Under the prerequisite not exceeding the utility model basic function, the utility model also has various changes and modifications, and these changes and improvements all should fall in claimed scope.The claimed scope of the utility model is defined by utility model content and specific embodiment.
Claims (7)
1. based on a full duplex multiple access instant communication terminal for Big Dipper short message, it is characterized in that, comprise speech processing module, control module and Beidou communication module; Wherein,
Described speech processing module is connected with described control module, sends to described control module for gathering voice messaging and being converted into digital information, and the speech data that described control module sends over is converted to voice messaging plays;
Described control module and described Beidou communication model calling, for the described digital information received is sent to described Beidou communication module, and send to described speech processing module by the speech data that described Beidou communication module sends over;
Described Beidou communication module, comprises the Big Dipper baseband processing module with short message communication function, many card management modules, radio-frequency module and antenna; Described antenna is connected with described Big Dipper baseband processing module through described radio-frequency module, described many card management modules are connected with described Big Dipper baseband processing module, described Big Dipper baseband processing module is connected for the Big Dipper SIM card of data receiver with one, and described many card management modules are connected with some Big Dipper SIM card sent for data.
2., as claimed in claim 1 based on the full duplex multiple access instant communication terminal of Big Dipper short message, it is characterized in that, described speech processing module comprises pick-up, loud speaker, voice D and D/A converter and low rate codec; Wherein, pick-up, loud speaker are connected with voice D and D/A converter respectively with low rate codec.
3. as claimed in claim 2 based on the full duplex multiple access instant communication terminal of Big Dipper short message, it is characterized in that, described low rate codec is the hard coder of voice adopting 600bps or 400bps.
4., as claimed in claim 1 based on the full duplex multiple access instant communication terminal of Big Dipper short message, it is characterized in that, described many card management modules comprise a microprocessor, and this microprocessor is connected with each Big Dipper SIM card sent for data respectively by I/O port.
5. as claimed in claim 1 based on the full duplex multiple access instant communication terminal of Big Dipper short message, it is characterized in that, described speech processing module is connected by serial ports or USB port with described information processing control module, and described speech processing module is connected by serial ports or USB port with described Beidou communication module.
6., as claimed in claim 1 based on the full duplex multiple access instant communication terminal of Big Dipper short message, it is characterized in that, described control module comprises Intelligent Human-Machine Interface.
7. the full duplex multiple access instant communication terminal based on Big Dipper short message as described in claim 1 or 5, it is characterized in that, described control module is connected with peripheral function circuit, and described peripheral function circuit comprises GPS module, 2G module, 3G module, 4G module, Wifi module, bluetooth module, USB interface, SD card interface, power management module or sensor circuit.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105824034A (en) * | 2016-05-12 | 2016-08-03 | 江苏星宇芯联电子科技有限公司 | Multi-card supporting Beidou Bluetooth voice communication system |
| CN106374991A (en) * | 2016-08-29 | 2017-02-01 | 北京华力创通科技股份有限公司 | Method, device and system for performing data transmission by utilizing Beidou satellite |
| CN106452688A (en) * | 2016-10-11 | 2017-02-22 | 福建星海通信科技有限公司 | Beidou data lost message retransmission method and system |
| CN106716871A (en) * | 2016-11-28 | 2017-05-24 | 深圳市大疆创新科技有限公司 | Control method, remote control unit and drone |
| CN106792581A (en) * | 2016-12-21 | 2017-05-31 | 福建星海通信科技有限公司 | A kind of Big Dipper voice communication method and system |
| CN107483102A (en) * | 2017-09-23 | 2017-12-15 | 郭锐 | More card Big Dippeves receive and dispatch radio station transponder |
| CN109068354A (en) * | 2018-06-27 | 2018-12-21 | 泰斗微电子科技有限公司 | Data encoding transmission method, terminal and system based on Beidou communication |
| CN111181628A (en) * | 2020-01-09 | 2020-05-19 | 成都国星通信有限公司 | Method, terminal and storage medium for transmitting voice data through Beidou short message |
| CN111934751A (en) * | 2020-08-28 | 2020-11-13 | 中南民族大学 | Agricultural environment data acquisition system and method based on Beidou short message |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105824034A (en) * | 2016-05-12 | 2016-08-03 | 江苏星宇芯联电子科技有限公司 | Multi-card supporting Beidou Bluetooth voice communication system |
| CN106374991A (en) * | 2016-08-29 | 2017-02-01 | 北京华力创通科技股份有限公司 | Method, device and system for performing data transmission by utilizing Beidou satellite |
| CN106452688A (en) * | 2016-10-11 | 2017-02-22 | 福建星海通信科技有限公司 | Beidou data lost message retransmission method and system |
| CN106716871A (en) * | 2016-11-28 | 2017-05-24 | 深圳市大疆创新科技有限公司 | Control method, remote control unit and drone |
| CN106792581A (en) * | 2016-12-21 | 2017-05-31 | 福建星海通信科技有限公司 | A kind of Big Dipper voice communication method and system |
| CN107483102A (en) * | 2017-09-23 | 2017-12-15 | 郭锐 | More card Big Dippeves receive and dispatch radio station transponder |
| CN109068354A (en) * | 2018-06-27 | 2018-12-21 | 泰斗微电子科技有限公司 | Data encoding transmission method, terminal and system based on Beidou communication |
| CN111181628A (en) * | 2020-01-09 | 2020-05-19 | 成都国星通信有限公司 | Method, terminal and storage medium for transmitting voice data through Beidou short message |
| CN111934751A (en) * | 2020-08-28 | 2020-11-13 | 中南民族大学 | Agricultural environment data acquisition system and method based on Beidou short message |
| CN111934751B (en) * | 2020-08-28 | 2021-05-18 | 中南民族大学 | Agricultural environment data acquisition system and method based on Beidou short message |
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