CN112615664A - Beidou short message multi-card user machine and implementation method - Google Patents
Beidou short message multi-card user machine and implementation method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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
- H04B7/18515—Transmission equipment in satellites or space-based relays
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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
- H04B7/18513—Transmission in a satellite or space-based 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
- H04B7/18519—Operations control, administration or maintenance
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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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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention relates to a Beidou short message multi-card user machine and an implementation method thereof. The Beidou short message multi-card user machine has the advantages of low cost, low power consumption, small volume, batch industrialization and great popularization value. Two auxiliary baseband chips are switched in turn, so that the situation that the auxiliary baseband chips occupy the transmitting time when being restarted is avoided, one auxiliary baseband chip sends a data packet by using the other auxiliary baseband chip when being restarted, the transmitting is enabled in turn, and the transmitting efficiency is further improved.
Description
Technical Field
The invention relates to the technical field of satellite communication terminals, in particular to a Beidou short message multi-card user machine and an implementation 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. Beidou No. three has served globally by 31 months 7 in 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 Beidou short message service transmits frequency limit for 60 seconds or 300 seconds at a time and transmits maximum 106 bytes at a time, and when a user wants to transmit faster frequency or more contents, one scheme is to add a plurality of Beidou short message user machines, and the scheme is high in equipment and complex in arrangement and installation. The other scheme is based on an FPGA circuit and directly performs transmission control of the multi-user card, and the scheme has high power consumption, large circuit board volume and complex technical realization.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the Beidou short message multi-card user machine and the implementation method thereof.
In order to achieve the above object, an aspect of the present invention provides a beidou short message multi-card user machine, which includes a main baseband chip, a first sub baseband chip, a selection module, a control module, a main card and a plurality of sub cards;
the master baseband chip receives the Beidou short message through the master card, demodulates the Beidou short message and sends the demodulated Beidou short message to the control module;
the control module selects one of the plurality of secondary cards to be connected to the first secondary baseband chip through the selection module, and controls the first secondary baseband chip to send the Beidou short message after being restarted.
Further, the selection module comprises a plurality of multiple-to-1 multiplexers, wherein at least one multiple-to-1 multiplexer is a master multiplexer, and the others are slave multiplexers; the data output ends of the main multiplexer are respectively connected to the data input end of one slave multiplexer, the selection signal of the control module and the data packet transmitted by the first slave baseband chip are received, and the corresponding slave multiplexer is selected to transmit the data packet according to the selection signal; each data output end of the slave multiplexer is connected with one slave card, receives the selection signal transmitted by the control module, and selects the slave card to transmit the data packet transmitted by the master multiplexer according to the selection signal. Further, the first sub baseband chip receives the Beidou short message and judges the wave beam with the signal.
The second aspect of the invention provides another Beidou short message multi-card user machine which comprises a main baseband chip, a first secondary baseband chip, a second secondary baseband chip, a selection module, a control module, a main card and a plurality of secondary cards;
the master baseband chip receives the Beidou short message through the master card, demodulates the Beidou short message and sends the demodulated Beidou short message to the control module;
the selection module selects one of the multiple auxiliary cards to be connected to the first auxiliary baseband chip, the second of the multiple auxiliary cards is connected to the second auxiliary baseband chip, the control module restarts the first auxiliary baseband chip or the second auxiliary baseband chip after the Beidou short message is sent, and the auxiliary baseband chips after the Beidou short message is restarted are enabled to send the Beidou short message in turn.
Further, the selection module comprises two groups of selection units which are respectively connected to the first sub baseband chip and the second sub baseband chip;
each group of selection units comprises a plurality of multiple-to-1 multiplexers, wherein at least one multiple-to-1 multiplexer is a main multiplexer, and the other multiple-to-1 multiplexers are slave multiplexers; the data output ends of the main multiplexer are respectively connected to the data input end of one slave multiplexer, the selection signal of the control module and the data packet transmitted by the first sub baseband chip or the second sub baseband chip are received, and the corresponding slave multiplexer is selected to transmit the data packet according to the selection signal; each data output end of the slave multiplexer is connected with one slave card, receives the selection signal transmitted by the control module, and selects the slave card to transmit the data packet transmitted by the master multiplexer according to the selection signal. Further, the first sub baseband chip receives the Beidou short message and judges the wave beam with the signal.
Further, the control module controls the first secondary baseband chip and the second secondary baseband chip to be enabled in turn, and when one secondary baseband chip is restarted, the other secondary baseband chip is used for sending the Beidou short message. Further, the control module selects two main multiplexers in turn and selects each auxiliary card in turn.
Further, the control module sets a priority for each auxiliary card, the priority of each auxiliary card is set to be a continuous natural number at the beginning, and the control module selects the auxiliary card with the minimum number to send the Beidou short message; when one sub-card is used, the priority number of the sub-card is added with 1, and the priority numbers of other sub-cards are subtracted with 1.
Further, the system also comprises a receiving module and a sending module; the receiving module receives satellite signals of Beidou short messages through a Beidou passive receiving antenna, the satellite signals are amplified through a low-noise amplifying circuit and then converted into intermediate frequency signals through a down-conversion circuit, and the intermediate frequency signals are sampled through an AD circuit and then sent to the main baseband chip for demodulation; the transmitting module converts the Beidou short message transmitted by the baseband chip into an analog signal through the DA, modulates a baseband transmitting signal into a radio frequency analog signal through the up-conversion circuit, amplifies the radio frequency analog signal through the power amplifying circuit and transmits the radio frequency analog signal to a satellite through the Beidou passive transmitting antenna.
The third aspect of the invention provides a method for implementing a Beidou short message multi-card user machine, which comprises the following steps:
the master baseband chip receives the Beidou short message through the master card;
selecting one of the plurality of secondary cards to be connected to the first secondary baseband chip according to the priority of the secondary cards; when the Beidou short message needs to be sent, enabling the restarted first auxiliary baseband chip, sending the Beidou short message through the correspondingly selected auxiliary card, and restarting the first auxiliary baseband chip after the sending is finished;
each auxiliary card is provided with a priority, the priority of each auxiliary card is set as a continuous natural number at the beginning, the priority is alternately set according to the auxiliary cards corresponding to the first auxiliary baseband chip and the second auxiliary baseband chip, and the auxiliary card with the minimum number is selected to send the Beidou short message; when one sub-card is used, the priority number of the sub-card is added with 1, and the priority numbers of other sub-cards are subtracted with 1.
The fourth aspect of the invention provides a method for realizing a Beidou short message multi-card user machine, which comprises the following steps:
the master baseband chip receives the Beidou short message through the master card;
selecting one of a plurality of secondary cards to be connected to the first secondary baseband chip, and connecting the second of the plurality of secondary cards to the second secondary baseband chip;
when the Beidou short message needs to be sent, enabling the restarted first secondary baseband chip or the restarted second secondary baseband chip, sending the Beidou short message through the correspondingly selected secondary card, and restarting the first secondary baseband chip or the second secondary baseband chip after the sending is finished;
enabling the restarted auxiliary baseband chips to send Beidou short messages in turn, and when one auxiliary baseband chip is restarted, using the other auxiliary baseband chip to send the Beidou short messages.
Further, setting a priority for each auxiliary card, setting the priority of each auxiliary card as a continuous natural number at the beginning, alternately setting the priority according to the auxiliary cards corresponding to the first auxiliary baseband chip and the second auxiliary baseband chip, and selecting the auxiliary card with the minimum number to send the Beidou short message; when one sub-card is used, the priority number of the sub-card is set as the maximum value of the priority, and the priority numbers of other sub-cards are reduced by 1.
The technical scheme of the invention has the following beneficial technical effects:
(1) the invention realizes that the Beidou short message data packets are transmitted by adopting the plurality of cards in turn, improves the transmission efficiency, and saves the cost by sharing the baseband chip and the transmitting circuit.
(2) The Beidou short message multi-card user machine has the advantages of small equipment volume, low power consumption, low cost, convenience in installation and use and great innovation and economic value.
(3) The invention sets a switching mode based on priority, sets the number of the priority according to the number of the auxiliary cards, can directly remove the auxiliary cards when the fault auxiliary cards exist, and has flexible setting.
(4) The invention adopts the alternate switching of the two auxiliary baseband chips, avoids the occupation of the emission time when the auxiliary baseband chips are restarted, utilizes the other auxiliary baseband chip to send the data packet when one auxiliary baseband chip is restarted, and enables the emission in turn, thereby further improving the emission efficiency.
Drawings
FIG. 1 is a block diagram of an embodiment employing a negative baseband chip;
FIG. 2 is a block diagram of an embodiment employing a negative baseband chip;
FIG. 3 is a short message reception flow diagram
FIG. 4 is a multi-card launch flow diagram of the present invention;
FIG. 5 is a schematic diagram of a multi-card selection circuit;
fig. 6 is a data structure diagram of the card selection method.
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.
As shown in fig. 1, in an embodiment, the big dipper short message multi-card subscriber station of the present invention includes a big dipper passive receiving antenna (S frequency point), a big dipper passive transmitting antenna (L frequency point), a low noise amplifier circuit, a power amplifier circuit, a down-conversion circuit, an up-conversion circuit, an AD, a DA, a main big dipper short message baseband chip, an auxiliary big dipper short message baseband chip, a plurality of big dipper subscriber cards, a selection module, a control module, and the like.
The Beidou passive receiving antenna (S frequency point) is responsible for receiving satellite aerial S frequency point short message signals, is connected with a low-noise amplification circuit, is connected to a down-conversion circuit after the S frequency point satellite signals are subjected to low-noise amplification, converts radio frequency signals into intermediate frequency signals, and simultaneously sends the intermediate frequency signals into a main Beidou short message baseband chip and an auxiliary Beidou short message baseband chip after the intermediate frequency signals are subjected to AD sampling. The secondary baseband chip receives the message signal, and can judge which beams have signals, thereby selecting the corresponding beams for inbound.
The control module selects one of the plurality of secondary cards to be connected to the first secondary baseband chip through the selection module, and controls the secondary baseband chip to send the Beidou short message after being restarted.
An up-conversion circuit of the radio frequency channel chip modulates a baseband transmitting signal to a radio frequency analog signal, then amplifies the transmitting signal through a power amplifying circuit, then accesses a Beidou passive transmitting antenna (L frequency point), and transmits the signal to a satellite in the space through the L frequency point antenna.
In order to further reduce the time occupied by restarting, two secondary baseband chips can be adopted to send data packets in turn, wherein when one is restarted, the other secondary baseband chip is adopted to send the data packets.
In another embodiment, as shown in fig. 2, the big dipper short message multi-card subscriber machine includes a big dipper passive receiving antenna (S frequency point), a big dipper passive transmitting antenna (L frequency point), a low noise amplifier circuit, a power amplifier circuit, a down-conversion circuit, an up-conversion circuit, an AD, a DA, a main big dipper short message baseband chip, a first sub baseband chip, a second sub baseband chip, a plurality of big dipper subscriber cards, a selection module, a control module, and the like.
The master baseband chip receives the Beidou short message through the master card, demodulates the Beidou short message and sends the demodulated Beidou short message to the control module;
the selection module selects one of the multiple auxiliary cards to be connected to the first auxiliary baseband chip, the second of the multiple auxiliary cards is connected to the second auxiliary baseband chip, the control module restarts the first auxiliary baseband chip or the second auxiliary baseband chip after the Beidou short message is sent, and the auxiliary baseband chips after the restarting are enabled to send the Beidou short message in turn. The first secondary baseband chip also receives the message signals and judges which beams have signals, so that the corresponding beams are selected for inbound.
Further, the selection module includes a first selector and a second selector respectively connected to the first sub baseband chip and the second sub baseband chip.
The control module controls the first secondary baseband chip and the second secondary baseband chip to be enabled in turn, and when one secondary baseband chip is restarted, the other secondary baseband chip is used for sending the Beidou short message. Further, the control module selects two main multiplexers in turn and selects each auxiliary card in turn.
Further, as shown in fig. 3, the master big dipper short message baseband chip is connected to a big dipper master subscriber card, and is used for normally receiving big dipper short message subscriber information. The main Beidou short message baseband chip is on line in real time, and the condition that the auxiliary baseband chip needs to be restarted does not exist, so that short message data are not lost.
Further, as shown in fig. 4, the multi-card transmission scheme is implemented by setting a single chip microcomputer controller through a GPIO, selecting a certain big dipper subscriber card to be connected to an auxiliary big dipper short message baseband chip, resetting the auxiliary big dipper short message baseband chip through the GPIO pin, restarting the auxiliary big dipper short message baseband chip, and at this time, completing the initialization work of the corresponding big dipper subscriber card by the auxiliary baseband chip, and ensuring that the auxiliary big dipper short message baseband chip can use a new big dipper card to perform transmission work.
Further, control module adopts the singlechip as main control chip, the singlechip enables the transmission of vice big dipper short message baseband chip and transmission BPSK data pin through the GPIO pin, switch to the transmission that the radio frequency channel corresponds enables and on BPSK data pin, then, the singlechip transmits the telegraph text that will send for vice big dipper short message baseband chip through the serial ports, vice big dipper short message baseband chip accomplishes the telegraph text transmission work through the telegraph text transmission instruction this moment, the telegraph text information will be transmitted to aerial big dipper satellite this moment.
Further, the single chip microcomputer switches the transmitting enable and the transmitting BPSK data pins of the main Beidou short message baseband chip to the transmitting enable and the BPSK data pins corresponding to the radio frequency channel again through the GPIO pins, and the default working mode of the user machine is recovered.
Further, as shown in fig. 5, the invention is only illustrated by supporting 64 beidou user cards by default, and the support of more beidou user cards can be similarly deduced.
Furthermore, the main pin definitions of the Beidou user card comprise three, namely clock, reset and data IO. 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 auxiliary Beidou short message baseband chip. The reset lines of 64 Beidou subscriber cards are connected in parallel and connected to the Beidou subscriber card reset pins corresponding to the auxiliary Beidou short message baseband chip.
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.
Furthermore, the circuit design of the clock pin and the reset pin of the 64 Beidou subscriber cards is very simple, the redundant pin resources of the single chip microcomputer and the auxiliary baseband chip are not occupied, and the circuit design is very simple and reliable. Further, 64 data IO pins of big dipper subscriber card, if the vice big dipper baseband chip of direct access, will occupy 64 IO pin resources to vice big dipper baseband chip also only has 1 IO big dipper card data pin, here need with a certain big dipper card data IO pin of 64 big dipper cards, when the transmission uses, switches to vice big dipper baseband chip.
If the 8-to-1 multiplexer chip is directly adopted to connect the Beidou subscriber cards, the 64 Beidou subscriber cards need 8-to-1 multiplexer chips, but need 24 ports to output 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.
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, in conjunction with fig. 5, the inputs of the thirty-eight decoders and one of the 8 outputs can be selected for connection through the S1, S2, S3 pins of the 8-to-1 multiplexer chip.
Further, 8 multiplexer chips of 1-out-of-8 multiplexer are placed at first and 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.
Further, 1 multiplexer chip of 8-to-1 multiplexer is placed, and 8 input DATA pins IO are connected with the Beidou user card DATA IO (IC _ DATA) on the final auxiliary Beidou short message baseband chip. At the moment, the selection pins S1, S2, S3, S4, S5 and S6 are connected to the pins of the GPIO of the singlechip.
Furthermore, when 64 Beidou subscriber cards are selected to be operated, the data IO communication of the Beidou subscriber cards of the Beidou baseband chips can be conducted only by setting the high and low levels of S1, S2, S3, S4, S5 and S6 through the single chip microcomputer according to the mapping table.
For the case of adopting two secondary baseband chips, the adopted selection unit comprises a plurality of multi-selection 1 multiplexers, wherein two multi-selection 1 multiplexers are a first main multiplexer and a second main multiplexer, and the other multiplexers are slave multiplexers; the data output ends of the main multiplexer are respectively connected to the data input ends of the slave multiplexers, the selection signals of the control module and the data packets transmitted by the first sub baseband chip or the second sub baseband chip are received, and the corresponding slave multiplexer is selected to transmit the data packets according to the selection signals; each data output end of the slave multiplexer is connected with one slave card, receives the selection signal transmitted by the control module, and selects the slave card to transmit the data packet transmitted by the master multiplexer according to the selection signal.
Further, as shown in fig. 6, the frequency of the default beidou short message user card is 1 minute to 5 minutes, and the beidou user card with the corresponding frequency is obtained according to the application of the competent department. The invention supports 64 Beidou subscriber cards by default, and when a Beidou subscriber card is selected for emission, the non-over-frequency of the Beidou subscriber card is considered.
Further, the single chip microcomputer program records the communication frequency and the last-time transmission timestamp of each card through the memory, a sequential retrieval mode can be adopted, the current timestamp of the card is judged to be subtracted by the last-time transmission timestamp, a difference timestamp to be transmitted is obtained, if the difference timestamp is larger than the transmission frequency corresponding to the user card, the user card can be used for transmitting, otherwise, the next card is judged, and the Beidou user card meeting the timestamp requirement is found.
Furthermore, when the currently selected Beidou user card is transmitted, the last transmission timestamp needs to be updated in time so as to ensure subsequent use.
Further, in order to switch the secondary cards in turn, priority can be set for each secondary card, the priority of each secondary card is set to be a continuous natural number at the beginning, for example, 1 and 2 3564, and the control module selects the secondary card with the lowest number and the priority of 1 to send the beidou short message; the priority number of the sub-card is then set to 64 max, and the priority numbers of the other sub-cards are all decremented by 1. The secondary card with the priority level of 1 is still selected for transmission next time. Priority coding is carried out according to the number of the auxiliary cards, and when bad cards exist, the cards can be flexibly removed without recoding.
In summary, according to the Beidou short message multi-card user machine and the implementation method thereof, the Beidou short message auxiliary baseband chip is added, the multiplexing antenna, the low-noise amplifier, the channel circuit, the power amplifier circuit, the AD circuit and other circuits are used, and the method for selecting the Beidou user card through the switching of the GPIO of the singlechip is adopted, so that the scheme for transmitting the Beidou short message multi-card user machine is realized simply and efficiently. The Beidou short message multi-card user machine has the advantages of low cost, low power consumption, small volume, batch industrialization and great popularization value. Two auxiliary baseband chips are switched in turn, so that the situation that the auxiliary baseband chips occupy the transmitting time when being restarted is avoided, one auxiliary baseband chip sends a data packet by using the other auxiliary baseband chip when being restarted, the transmitting is enabled in turn, and the transmitting efficiency is further improved.
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 multi-card user machine is characterized by comprising a main baseband chip, a first auxiliary baseband chip, a selection module, a control module, a main card and a plurality of auxiliary cards;
the master baseband chip receives the Beidou short message through the master card, demodulates the Beidou short message and sends the demodulated Beidou short message to the control module;
the control module selects one of the plurality of secondary cards to be connected to the first secondary baseband chip through the selection module, and controls the first secondary baseband chip to send the Beidou short message after being restarted.
2. The beidou short message multi-card subscriber machine of claim 1, wherein the selection module comprises a plurality of 1-of-multiple-choice multiplexers, wherein at least one 1-of-multiple-choice multiplexer is a master multiplexer, and the others are slave multiplexers; the data output ends of the main multiplexer are respectively connected to the data input end of one slave multiplexer, the selection signal of the control module and the data packet transmitted by the first slave baseband chip are received, and the corresponding slave multiplexer is selected to transmit the data packet according to the selection signal; each data output end of the slave multiplexer is connected with one slave card, receives the selection signal transmitted by the control module, and selects the slave card to transmit the data packet transmitted by the master multiplexer according to the selection signal. Further, the first sub baseband chip receives the Beidou short message and judges the wave beam with the signal.
3. A Beidou short message multi-card user machine is characterized by comprising a main baseband chip, a first auxiliary baseband chip, a second auxiliary baseband chip, a selection module, a control module, a main card and a plurality of auxiliary cards;
the master baseband chip receives the Beidou short message through the master card, demodulates the Beidou short message and sends the demodulated Beidou short message to the control module;
the selection module selects one of the multiple auxiliary cards to be connected to the first auxiliary baseband chip, the second of the multiple auxiliary cards is connected to the second auxiliary baseband chip, the control module restarts the first auxiliary baseband chip or the second auxiliary baseband chip after the Beidou short message is sent, and the auxiliary baseband chips after the Beidou short message is restarted are enabled to send the Beidou short message in turn.
4. The beidou short message multi-card subscriber machine of claim 3, wherein the selection module comprises two groups of selection units respectively connected to the first sub baseband chip and the second sub baseband chip;
each group of selection units comprises a plurality of multiple-to-1 multiplexers, wherein at least one multiple-to-1 multiplexer is a main multiplexer, and the other multiple-to-1 multiplexers are slave multiplexers; the data output ends of the main multiplexer are respectively connected to the data input end of one slave multiplexer, the selection signal of the control module and the data packet transmitted by the first sub baseband chip or the second sub baseband chip are received, and the corresponding slave multiplexer is selected to transmit the data packet according to the selection signal; each data output end of the slave multiplexer is connected with one slave card, receives the selection signal transmitted by the control module, and selects the slave card to transmit the data packet transmitted by the master multiplexer according to the selection signal. Further, the first sub baseband chip receives the Beidou short message and judges the wave beam with the signal.
5. The beidou short message multi-card subscriber machine of claim 4, wherein the control module controls to alternately enable the first sub baseband chip and the second sub baseband chip, and when one of the sub baseband chips is restarted, the other sub baseband chip is used for sending the beidou short message. Further, the control module selects two main multiplexers in turn and selects each auxiliary card in turn.
6. The beidou short message multi-card user machine according to claim 1 or 3, wherein the control module sets a priority for each secondary card, the priority of each secondary card is set as a continuous natural number initially, and the control module selects the secondary card with the smallest number to send the beidou short message; when one sub-card is used, the priority number of the sub-card is added with 1, and the priority numbers of other sub-cards are subtracted with 1.
7. The beidou short message multi-card subscriber machine according to claim 1 or 3, further comprising a receiving module and a sending module; the receiving module receives satellite signals of Beidou short messages through a Beidou passive receiving antenna, the satellite signals are amplified through a low-noise amplifying circuit and then converted into intermediate frequency signals through a down-conversion circuit, and the intermediate frequency signals are sampled through an AD circuit and then sent to the main baseband chip for demodulation; the transmitting module converts the Beidou short message transmitted by the baseband chip into an analog signal through the DA, modulates a baseband transmitting signal into a radio frequency analog signal through the up-conversion circuit, amplifies the radio frequency analog signal through the power amplifying circuit and transmits the radio frequency analog signal to a satellite through the Beidou passive transmitting antenna.
8. A method for realizing a Beidou short message multi-card user machine is characterized by comprising the following steps:
the master baseband chip receives the Beidou short message through the master card;
selecting one of the plurality of secondary cards to be connected to the first secondary baseband chip according to the priority of the secondary cards; when the Beidou short message needs to be sent, enabling the restarted first auxiliary baseband chip, sending the Beidou short message through the correspondingly selected auxiliary card, and restarting the first auxiliary baseband chip after the sending is finished;
each auxiliary card is provided with a priority, the priority of each auxiliary card is set as a continuous natural number at the beginning, the priority is alternately set according to the auxiliary cards corresponding to the first auxiliary baseband chip and the second auxiliary baseband chip, and the auxiliary card with the minimum number is selected to send the Beidou short message; when one sub-card is used, the priority number of the sub-card is added with 1, and the priority numbers of other sub-cards are subtracted with 1.
9. A method for realizing a Beidou short message multi-card user machine is characterized by comprising the following steps:
the master baseband chip receives the Beidou short message through the master card;
selecting one of a plurality of secondary cards to be connected to the first secondary baseband chip, and connecting the second of the plurality of secondary cards to the second secondary baseband chip;
when the Beidou short message needs to be sent, enabling the restarted first secondary baseband chip or the restarted second secondary baseband chip, sending the Beidou short message through the correspondingly selected secondary card, and restarting the first secondary baseband chip or the second secondary baseband chip after the sending is finished;
enabling the restarted auxiliary baseband chips to send Beidou short messages in turn, and when one auxiliary baseband chip is restarted, using the other auxiliary baseband chip to send the Beidou short messages.
10. The method for implementing the beidou short message multi-card user machine according to claim 9, characterized in that a priority is set for each secondary card, the priority of each secondary card is initially set to be a continuous natural number, the priority is alternately set according to the secondary cards corresponding to the first secondary baseband chip and the second secondary baseband chip, and the secondary card with the smallest number is selected to send the beidou short message; when one sub-card is used, the priority number of the sub-card is set as the maximum value of the priority, and the priority numbers of other sub-cards are reduced by 1.
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