CN110996274A - System and method for sending picture based on Beidou short message - Google Patents
System and method for sending picture based on Beidou short message Download PDFInfo
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- CN110996274A CN110996274A CN201911227410.9A CN201911227410A CN110996274A CN 110996274 A CN110996274 A CN 110996274A CN 201911227410 A CN201911227410 A CN 201911227410A CN 110996274 A CN110996274 A CN 110996274A
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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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- 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
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/1858—Arrangements for data transmission on the physical system, i.e. for data bit transmission between network components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
- H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets
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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
- H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
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Abstract
The invention discloses a Beidou short message based picture sending system and method. The system comprises an image processing module and a Beidou short message multi-card user terminal; when the Beidou short message multi-card user terminal sends the pictures, sub-packaging is carried out firstly, and sub-packaging data of the pictures is sent to the server side in a circulating mode through the Beidou short message multi-card terminal. And the server feeds back the frame number of the lost packet according to the receiving condition, and the Beidou short message multi-card terminal retransmits the lost packet data until the server completely receives the picture data. And the server side packages the picture data, so that an original picture file is restored. The invention solves the problem of picture transmission by using the Beidou short message satellite link, provides a supplementary means for picture transmission as a beneficial supplement to mobile wireless communication, and enriches application scenes. The unreliable of Beidou short message transmission is considered, and the reliable and efficient transmission of the pictures is realized by combining a specific data structure and an algorithm.
Description
Technical Field
The invention relates to the technical field of Beidou terminals for picture transmission, in particular to a Beidou short message based picture sending system and 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.
In the current Beidou short message satellite system design, the civil user card is divided into four grades, and the corresponding data lengths are respectively as follows:
beidou card grade 1: 110 bit-13.75 Bytes
Beidou card grade 2: 408 bits 51Bytes
Beidou card grade 3: 628bit 78.5Bytes
Beidou card grade 4: 848 bits 106Bytes
At present, civil grade cards issued by Beidou competent departments mainly take grade 3 cards and grade 4 cards as main cards to be issued, managed and used. Meanwhile, the communication frequency of the civil Beidou card is defaulted to 60 seconds, namely the fastest 60 seconds, and then a Beidou short message can be sent to the Beidou satellite. Aiming at the design characteristics of the Beidou short message satellite, the Beidou short message is mostly applied to the related fields of small quantity, low frequency and the like and is used as a beneficial supplement of mobile wireless communication, such as the fields of geological disaster monitoring, fishing boat position monitoring, emergency management and the like.
Taking a JPG compressed picture as an example, the picture file size is from several K to several megabytes, or even larger, according to parameters such as size, chroma, and the like. By adopting the traditional Beidou short message using mode, the transmission requirement of the picture can not be obviously met. In some remote scenes or scenes that a wired or mobile wireless network cannot cover, a client has a strong demand for transmitting pictures by means of a Beidou satellite so as to meet the needs of actual working services.
Disclosure of Invention
Aiming at the requirement of transmitting pictures through Beidou, the invention provides the method and the system for sending the pictures based on the Beidou short messages, so that the method and the system can meet the field use effect, have low equipment cost and easy deployment, and have industrial popularization value, thereby having higher social and economic values.
In order to solve the above problems, an aspect of the present invention provides a system for sending a picture based on a beidou short message, including: the Beidou short message multi-card user terminal comprises a picture processing module and a Beidou short message multi-card user terminal;
the picture processing module divides the picture to be transmitted into a plurality of data packets, so that each data packet meets the limitation of transmitting bytes by the Beidou user card;
the Beidou short message multi-card user terminal comprises a Beidou baseband circuit, a processing circuit, a user card interface circuit, a radio frequency transmitting circuit and a plurality of Beidou user cards;
the Beidou baseband circuit selects one Beidou user card to send a data packet by selecting a user card interface circuit;
the processing circuit receives a plurality of data packets sent by the picture processing module and sequentially sends the data packets through the Beidou user cards selected by the Beidou baseband circuit;
the data packet is transmitted to the Beidou satellite through the radio frequency transmitting circuit.
Further, the Beidou short message multi-card user terminal also comprises a radio frequency receiving circuit;
the picture receiver transmits the Beidou short message through the Beidou satellite, wherein the Beidou short message comprises a data packet receiving condition, and the radio frequency receiving circuit receives the Beidou short message; and the processing circuit acquires the receiving condition of the data packet according to the Beidou short message and transmits the data packet which is not received again.
Furthermore, the data packet does not exceed 106bytes, and the Beidou user card is 64.
Further, the transmission structure of the data packet includes a header, a frame number, a total frame number, a content and a trailer field.
Furthermore, the picture receiver is provided with a plurality of Beidou ground commander terminals, a plurality of Beidou short message multi-card user terminals are correspondingly arranged, and the picture processing module sends pictures to the Beidou ground commander terminals in parallel through the plurality of Beidou short message multi-card user terminals.
Furthermore, the user card interface circuit comprises a plurality of multiplexers, receives the data packets and the selection signals transmitted by the Beidou baseband circuit, and selects the corresponding Beidou user card to transmit the data packets according to the selection signals.
Furthermore, the user card interface circuit comprises a plurality of 8-to-1 multiplexers, wherein at least one 8-to-1 multiplexer is a main multiplexer, and the other multiplexers are slave multiplexers; 8 data output ends of the master multiplexer are respectively connected to a data input end of one slave multiplexer, receive a data packet and a selection signal transmitted by the Beidou baseband circuit, and select the corresponding slave multiplexer to transmit the data packet according to the selection signal; each data output end of the slave multiplexer is connected with a Beidou subscriber card, the selection signals transmitted by the Beidou baseband circuit are received, and the Beidou subscriber cards are selected according to the selection signals to transmit data packets transmitted by the master multiplexer.
The invention also provides a method for sending pictures based on the Beidou short message, which comprises the following steps:
dividing the picture to be transmitted into a plurality of data packets, so that each data packet meets the limitation of transmitting bytes by the Beidou user card;
sequentially selecting the Beidou user cards to sequentially transmit the data packets to the Beidou satellite;
and the picture receiver receives the data packet, sends a Beidou short message feedback data packet receiving condition through the Beidou satellite, and reissues the data packet which is not received until the feedback transmission is successful.
Furthermore, the picture receiver sets a plurality of Beidou ground director terminals to receive data packets of different pictures in parallel, and the pictures are sent to the corresponding Beidou ground director terminals in parallel through a plurality of Beidou short message multi-card user terminals.
Further, the transmission structure of the data packet includes a header, a frame number, a total frame number, a content and a trailer field.
The technical scheme of the invention has the beneficial technical effects that:
(1) according to the invention, the Beidou short message user terminal is upgraded to support 64 Beidou user cards by default, so that the sending efficiency is improved, and meanwhile, the reliable transmission of the pictures is realized by combining a specific data structure and a transmission algorithm.
(2) The Beidou short message based picture sending system and the method solve the problem of picture transmission by using a Beidou short message satellite link, provide beneficial supplementary means for picture transmission for certain special application scenes, enrich the application scenes and have great industrial popularization value.
(3) According to the Beidou short message multi-card terminal, the Beidou baseband circuit and the processing circuit are multiplexed by adopting the user card interface circuit based on the address mapping of the Beidou user card, so that the manufacturing cost and the complexity of the Beidou short message multi-card terminal are reduced.
Drawings
FIG. 1 is a system block diagram of the present invention;
FIG. 2 is a block diagram of a Beidou short message multi-card user terminal of the invention;
FIG. 3 is a logic diagram of 64 Beidou card circuits of the invention;
FIG. 4 is a data structure layout of the picture transmission of the present invention;
FIG. 5 is a picture transmission flow diagram of the present invention;
fig. 6 is a schematic diagram of the maximum bandwidth design of the present invention.
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 invention provides a Beidou short message based picture sending system, which comprises a picture processing module and a Beidou short message multi-card user terminal in combination with the system shown in FIG. 1;
the picture processing module divides a picture to be transmitted into a plurality of data packets, and each data packet meets the limitation of transmitting bytes by the Beidou user card; furthermore, the data packet does not exceed 106bytes, and the Beidou user card is 64. Further, the transmission structure of the data packet includes five fields of a header, a frame number, a total frame number, a content and a trailer. Further, the image processing module may be, for example, a PC computer.
The Beidou short message multi-card user terminal comprises a Beidou baseband circuit, a processing circuit, a user card interface circuit, a radio frequency transmitting circuit, a radio frequency receiving circuit and a plurality of Beidou user cards, and is combined with the figure 2.
The Beidou baseband circuit selects one Beidou user card to send a data packet by selecting a user card interface circuit; the user card interface circuit comprises a plurality of multiplexers, receives the data packets and the selection signals transmitted by the Beidou baseband circuit, and selects the corresponding Beidou user card to transmit the data packets according to the selection signals. In one embodiment, the user card interface circuit comprises a plurality of 8-to-1 multiplexers, wherein at least one 8-to-1 multiplexer is a master multiplexer, and the other multiplexers are slave multiplexers; 8 data output ends of the master multiplexer are respectively connected to a data input end of one slave multiplexer, receive a data packet and a selection signal transmitted by the Beidou baseband circuit, and select the corresponding slave multiplexer to transmit the data packet according to the selection signal; each data output end of the slave multiplexer is connected with a Beidou subscriber card, the selection signals transmitted by the Beidou baseband circuit are received, and the Beidou subscriber cards are selected according to the selection signals to transmit data packets transmitted by the master multiplexer. The Beidou baseband circuit can be realized by adopting an FPGA (field programmable gate array), for example.
The processing circuit receives a plurality of data packets sent by the picture processing module and sequentially sends the data packets through the Beidou user cards selected by the Beidou baseband circuit; specifically, the processing circuit is a single chip controller.
The data packet is transmitted to the Beidou satellite through a radio frequency transmitting circuit; the radio frequency transmitting circuit comprises an L frequency point passive transmitting antenna, an L frequency point power amplifying circuit and an L frequency point up-conversion circuit, a data packet to be transmitted is transmitted to the L frequency point up-conversion circuit, and after the L frequency point up-conversion circuit up-converts a baseband signal, the baseband signal is amplified by the L frequency point power amplifying circuit and transmitted to a satellite in a northward bucket through the L frequency point passive transmitting antenna.
The image receiver transmits the Beidou short message through the Beidou satellite, the receiving condition of the data packet is included, and the radio frequency receiving circuit receives the Beidou short message; and the processing circuit acquires the receiving condition of the data packet according to the Beidou short message and transmits the data packet which is not received again. The picture receiver transmits a Beidou short message through a Beidou satellite to transmit a radio frequency signal, the Beidou short message comprises a data packet receiving condition, an S frequency point receiving passive antenna receives the radio frequency signal, the radio frequency signal is amplified through an S frequency point low-noise amplifying circuit, is converted into a digital intermediate frequency signal after being subjected to down-conversion through an S frequency point down-conversion circuit, and is subjected to signal capturing, tracking, decoding and analysis through a Beidou baseband circuit to obtain the Beidou short message; and the processing circuit acquires the receiving condition of the data packet according to the Beidou short message and transmits the data packet which is not received again.
The big dipper short message multi-card user terminal and the common big dipper short message user terminal are mainly distinguished by multiplexing main circuits of the big dipper short message user terminal, including circuits such as a public antenna unit, a radio frequency unit and a baseband unit, and only by adding 64 big dipper user card interface circuits and upgrading and reconstructing a big dipper baseband processing program and a single chip controller processing program, the big dipper short message multi-card user terminal and the common big dipper short message user terminal support the use functions of 64 big dipper user cards.
Further, according to the definition of the beidou short message inbound protocol, one frame time is 31.25 milliseconds, and one short message is defined according to the length and is composed of 4 frames at most, that is, the time for sending one short message is 31.25 × 4 — 125 milliseconds. For 1 minute (60 seconds), the maximum number of messages that can be entered theoretically is 480.
Furthermore, in order to fully utilize the Beidou short message transmission bandwidth, the Beidou short message multi-card machine can be designed into terminal equipment supporting 480 Beidou user cards.
Further, the invention is only illustrated by supporting 64 Beidou subscriber cards by default, and the support of more Beidou subscriber cards can be similarly deduced.
As shown in fig. 3, for the embodiment of the user card interface circuit, the main pin definitions of the beidou user card include three, i.e., a clock, a reset, and a data IO interface. The Beidou user card can be used in the terminal equipment only in a serial mode, namely, any Beidou user card can be used at the same time. The clock lines of 64 Beidou subscriber cards can be connected in parallel and connected to the Beidou subscriber card clock pins corresponding to the Beidou baseband. The reset lines of 64 Beidou subscriber cards are connected in parallel and connected to the Beidou subscriber card reset pins corresponding to the Beidou baseband.
Further, because 64 big dipper subscriber cards have been inserted to big dipper subscriber card's clock pin, reset pin, need increase the driving force here to guarantee that the circuit can normally drive big dipper subscriber card. Further, increase the driving force, can increase 4.7K pullups on clock pin and reset pin, guarantee sufficient driving force. As described above, the circuit design of the clock pin and the reset pin of the 64 Beidou user cards is very simple, no redundant FPGA pin resource is occupied, and the circuit design is very simple and reliable.
Furthermore, 64 data IO pins of the Beidou user cards occupy 64 IO pin resources if being directly connected into the Beidou baseband FPGA, and occupy more FPGA pin resources if supporting more Beidou user cards.
In one embodiment, a mature 8-to-1 multiplexer chip, an 8-to-1 multiplexer chip, may receive a selection signal through the S1, S2, S3 pins of the thirty-eight decoder to select one of 8 outputs to communicate with the data receiving end, i.e., transmit the received data through one of the 8 outputs. The 1-out-of-8 multiplexer chip can adopt a mature chip such as SN74CBTLV 3251.
Further, if an 8-to-1 multiplexer chip is directly used for connecting the Beidou subscriber cards, 8-to-1 multiplexer chips are needed for 64 Beidou subscriber cards, and 24 ports are needed for outputting selection signals. In one embodiment, the occupation of the ports of the Beidou baseband circuit is further reduced by adopting a mode of cascading 8-to-1 multiplexer chips. Firstly, 8 multiplexer chips from 8 to 1, such as U1-U8 in FIG. 3, are placed, and data output ends are respectively connected with data IO pins of 64 Beidou user cards. At this time, 8 1-out-of-8 multiplexer chips have 8 input DATA pins, a _ DATA _1, …, a _ DATA _8, respectively. And then 1 8-to-1 multiplexer chip U9 is placed to connect 8 input DATA pins IO with the final Beidou user card DATA IO (IC _ DATA) on the Beidou baseband circuit. At the moment, the selection pins S1, S2, S3, S4, S5 and S6 are connected to the Beidou baseband circuit. When the selection is operated 64 big dipper subscriber cards, only according to the mapping table, through big dipper baseband circuit setting S1, S2, S3, S4, S5, S6 'S high-low level, can switch on the data IO intercommunication of this big dipper subscriber card and big dipper baseband circuit' S big dipper subscriber card.
The address mapping based on the Beidou user card is adopted, the core circuit is multiplexed, and the manufacturing cost and the complexity of the Beidou short message multi-card terminal are reduced.
Furthermore, when the Beidou short message is transmitted through the satellite, the success rate is generally 95% -100%, the problem of sequence dislocation possibly exists, and the Beidou short message has certain unreliable characteristics when being transmitted through the satellite. Therefore, a specific data structure and algorithm need to be designed to ensure the reliability of the picture transmission. As shown in fig. 4, the transmission structure definition of the picture data structure packet includes five fields, i.e., a header, a frame number, a total frame number, a content, and a trailer. Wherein, the head and tail of the packet are respectively 1byte for identifying and defining the beginning and the end of the packet. Here, the header is defined as a constant 0XFE and the trailer is defined as a constant 0 XEF. The constant definition users of the packet head and the packet tail can define and adjust according to the actual situation. The frame number and the total frame number are respectively 2 bytes, and the range is 0-0 XFFF, namely 0-65535. Wherein the frame number indicates the number of frames currently transferred, and the total frame number indicates how many frames a picture is composed of in total. The frame number and the total frame number are important bases for the subsequent server side to perform the image package reduction.
Furthermore, according to the definition of the civil-grade 4 Beidou user card, 106bytes of information can be transmitted, the header, the packet tail, the frame number and the total frame number are removed, 6bytes are totally removed, 100 bytes of contents can be actually transmitted in each 1 packet, and the maximum support can be 100 × 65535-6M of pictures of files according to the definition of a data structure body.
Furthermore, if the user needs to transmit a larger picture, the length definitions of the frame number and the total frame number field can be increased according to the definition of the redesign structure, so that the transmission requirement of the larger picture is met. However, according to the actual bandwidth of the Beidou short message, the 6M pictures basically meet the actual use requirements.
Further, as shown in fig. 5, for example, the civil level 4 beidou user card is taken as an example, and for example, a picture with a size of 5K is transmitted, 100 bytes are transmitted at a time, so that a minimum of 52 transmissions are required.
Further, as shown in fig. 6, in order to further improve the bandwidth and efficiency of picture transmission and realize parallel transmission of pictures, 10 big dipper short message multi-card terminals can be placed at the terminal, that is, the PC computer is connected with 10 big dipper short message multi-card terminals, at this time, 10 north fighter commanders are also erected at the server side, and the outbound beam corresponding to the 10 north fighter commanders is set to be 1-10. The design of the 10 Beidou short message terminals is mainly based on the reference of the current Beidou second short message satellite with 10 outbound wave beams in total.
At the moment, the PC computer corresponds to 10 Beidou short message multi-card terminals and respectively transmits Beidou user addresses of 10 Beidou commanders at the server end, so that 10 maximum parallel efficiencies are achieved, and meanwhile, the Beidou satellite also respectively gives a Beidou ground commander terminal through 10 wave beams, so that the purposes of maximum use bandwidth and transmission efficiency are achieved.
In another aspect, the present invention provides a method for sending a picture based on a beidou short message, as shown in fig. 5, including the following steps:
s100, dividing a picture to be transmitted into a plurality of data packets, wherein each data packet meets the limitation of transmitting bytes by the Beidou user card;
for example, the PC computer packetizes the pictures to be transmitted in a size of 100 bytes, here into 52 packets, the last 1 packet being 20 bytes in size. And the PC fills 52 data packets to be sent according to the data structure described above, and circularly sends the data packets through the Beidou short message multi-card terminal.
S200, sequentially selecting a Beidou user card to sequentially transmit the data packets to a Beidou satellite;
s300, the picture receiver receives the data packet, sends a Beidou short message through a Beidou satellite to feed back the receiving condition of the data packet, and re-sends the data packet which is not received; until receiving the transmission delivery success message.
After the 1 st round of 52 packets is sent, the server side sends a piece of feedback information to the Beidou short message multi-card terminal to inform the received picture packet data condition. If all the data are received, the Beidou short message multi-card terminal finishes working, if the server side informs that the sub-frame data are not received, the Beidou short message multi-card terminal needs to re-transmit the corresponding lost frame data packets, and the picture is not transmitted until the server side feeds back a transmission success message.
Further, after the server program collects all the picture data packets, repackaging the picture framing data according to the order of the sub-frame numbers, and restoring the picture to 1 complete picture.
In summary, the invention provides a system and a method for sending pictures based on Beidou short messages, wherein the system comprises a picture processing module and a Beidou short message multi-card user terminal; the Beidou short message multi-card user terminal comprises a Beidou baseband circuit, a processing circuit, a user card interface circuit, a radio frequency transmitting circuit, a radio frequency receiving circuit and a plurality of Beidou user cards. When the Beidou short message multi-card user terminal sends the pictures, the sub-package design is firstly carried out, and sub-package data of the pictures are sent to the server side in a circulating mode through the Beidou short message multi-card terminal. And the server side sends the frame number of the lost packet to the Beidou short message multi-card terminal according to the received actual condition, and the Beidou short message multi-card terminal resends the lost packet data until the server side completely receives the picture data. And the server program packages the picture data, so that an original picture file is restored. Meanwhile, the unreliable of Beidou short message transmission is considered, and the reliable and efficient transmission of the pictures is realized by combining a specific data structure and an algorithm. The Beidou short message based picture sending system and the method solve the problem of picture transmission by using a Beidou short message satellite link, provide a supplementary means for picture transmission as a beneficial supplement to mobile wireless communication, enrich application scenes, improve user experience and have great market popularization value.
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. The utility model provides a system for sending picture based on big dipper short message which characterized in that includes: the Beidou short message multi-card user terminal comprises a picture processing module and a Beidou short message multi-card user terminal;
the picture processing module divides the picture to be transmitted into a plurality of data packets, so that each data packet meets the limitation of transmitting bytes by the Beidou user card;
the Beidou short message multi-card user terminal comprises a Beidou baseband circuit, a processing circuit, a user card interface circuit, a radio frequency transmitting circuit and a plurality of Beidou user cards;
the Beidou baseband circuit selects one Beidou user card to send a data packet by selecting a user card interface circuit;
the processing circuit receives a plurality of data packets sent by the picture processing module and sequentially sends the data packets through the Beidou user cards selected by the Beidou baseband circuit;
the data packet is transmitted to the Beidou satellite through the radio frequency transmitting circuit.
2. The system for sending pictures based on the beidou short message of claim 1, wherein the beidou short message multi-card user terminal further comprises a radio frequency receiving circuit;
the picture receiver transmits the Beidou short message through the Beidou satellite, wherein the Beidou short message comprises a data packet receiving condition, and the radio frequency receiving circuit receives the Beidou short message; and the processing circuit acquires the receiving condition of the data packet according to the Beidou short message and transmits the data packet which is not received again.
3. The system for sending pictures based on Beidou short messages according to claim 1 or 2, wherein the data packet has no more than 106bytes, and the Beidou user card has 64 pieces.
4. The system for sending pictures based on beidou short messages as claimed in claim 1 or 2, wherein the transmission structure of the data packet comprises a header, a frame number, a total frame number, contents and a trailer field.
5. The system for sending the picture based on the Beidou short message service according to claim 1 or 2, wherein the picture receiving party is provided with a plurality of Beidou ground director terminals, a plurality of Beidou short message multi-card user terminals are correspondingly arranged, and the picture processing module sends the picture to the Beidou ground director terminals in parallel through the plurality of Beidou short message multi-card user terminals.
6. The system for sending pictures based on the Beidou short messages according to claim 1 or 2, wherein the user card interface circuit comprises a plurality of multiplexers, receives the data packets and the selection signals transmitted by the Beidou baseband circuit, and selects the corresponding Beidou user card to transmit the data packets according to the selection signals.
7. The Beidou short message based picture system according to claim 6, wherein the user card interface circuit comprises a plurality of 8-to-1 multiplexers, at least one 8-to-1 multiplexer is a master multiplexer, and the others are slave multiplexers; 8 data output ends of the master multiplexer are respectively connected to a data input end of one slave multiplexer, receive a data packet and a selection signal transmitted by the Beidou baseband circuit, and select the corresponding slave multiplexer to transmit the data packet according to the selection signal; each data output end of the slave multiplexer is connected with a Beidou subscriber card, the selection signals transmitted by the Beidou baseband circuit are received, and the Beidou subscriber cards are selected according to the selection signals to transmit data packets transmitted by the master multiplexer.
8. A method for sending pictures based on Beidou short messages is characterized by comprising the following steps:
dividing the picture to be transmitted into a plurality of data packets, so that each data packet meets the limitation of transmitting bytes by the Beidou user card;
sequentially selecting the Beidou user cards to sequentially transmit the data packets to the Beidou satellite;
and the picture receiver receives the data packet, sends a Beidou short message feedback data packet receiving condition through the Beidou satellite, and reissues the data packet which is not received until the feedback transmission is successful.
9. The method of claim 8, wherein the picture receiver sets a plurality of Beidou ground director terminals to receive data packets of different pictures in parallel, and the picture is sent to the corresponding Beidou ground director terminal in parallel through the plurality of Beidou short message multi-card user terminals.
10. The method according to claim 8, wherein the transmission structure of the data packet includes a header, a frame number, a total frame number, a content, and a trailer field.
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| CN201911227410.9A CN110996274A (en) | 2019-12-04 | 2019-12-04 | System and method for sending picture based on Beidou short message |
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| CN201911227410.9A CN110996274A (en) | 2019-12-04 | 2019-12-04 | System and method for sending picture based on Beidou short message |
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| CN112653613A (en) * | 2020-12-14 | 2021-04-13 | 北京天海达科技有限公司 | System and method for realizing ocean vessel mail based on Beidou short message |
| CN113691305A (en) * | 2021-10-26 | 2021-11-23 | 武汉兴图新科电子股份有限公司 | Cloud-edge-end-based picture transmission method for Beidou third-number short message channel |
| CN113743693A (en) * | 2020-05-29 | 2021-12-03 | 上海瀛联信息科技股份有限公司 | Beidou command system for multitask scheduling |
| CN115022253A (en) * | 2022-05-25 | 2022-09-06 | 西安北斗安全技术有限公司 | Image transmission method based on Beidou third-generation satellite short message and artificial intelligence |
| CN115665425A (en) * | 2022-11-16 | 2023-01-31 | 北极星云空间技术股份有限公司 | Progressive picture transmission method suitable for satellite short message communication |
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