CN113301517A - Terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages - Google Patents
Terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages Download PDFInfo
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- CN113301517A CN113301517A CN202110528715.4A CN202110528715A CN113301517A CN 113301517 A CN113301517 A CN 113301517A CN 202110528715 A CN202110528715 A CN 202110528715A CN 113301517 A CN113301517 A CN 113301517A
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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
- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a terminal capable of simultaneously supporting Beidou No. two short messages and Beidou No. three short messages. The system comprises a multiplexing receiving module, a multiplexing transmitting module, a Beidou second SIM card, a Beidou third SIM card, a baseband module and a control module; the terminal realizes the receiving and sending functions of the Beidou second short message and the Beidou third short message. The terminal has the characteristics of low equipment cost, small volume, low power consumption, high integration level and the like, and has great industrial popularization value and remarkable economic benefit. The Beidou second and third short messages are multiplexed by the receiving and sending module, so that the circuit is simplified, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of Beidou short message terminals, in particular to a terminal capable of simultaneously supporting Beidou No. two short messages and Beidou No. three short messages.
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 service capacity of the Beidou third short message is enlarged by 10 times compared with that of the Beidou second short message, and the transmitting power of the Beidou third short message is reduced by 10 times compared with that of the Beidou second short message, so that the Beidou third short message has stronger communication service capacity. Meanwhile, the Beidou second short message satellite system, 5 satellites and 10 wave beams are still in normal service, and the country does not have a specific time node for suspending the Beidou second short message service, and at present, the service is specified to be at least more than 2025 years.
Considering the compatibility requirements of old users for the second and third Beidou messages and considering the new users to adopt the second Beidou message for certain compatibility or enhanced use, the second independent Beidou message device or the third independent Beidou message device cannot meet the use requirements of the users.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the terminal capable of simultaneously supporting the Beidou No. two short messages and the Beidou No. three short messages, and simultaneously supporting the Beidou No. two short message SIM card and the Beidou No. three short message SIM card, so that the purpose of simultaneously using the functions of the Beidou No. two short messages and the Beidou No. three short messages is achieved. The terminal has the advantages of high integration level, low cost, convenience in use and great market application value.
In order to achieve the purpose, the invention provides a terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages, which comprises a multiplexing receiving module, a multiplexing transmitting module, a Beidou No. two SIM card, a Beidou No. three SIM card, a baseband module and a control module;
the multiplexing receiving module receives the Beidou second short message S frequency point signal and the Beidou third short message S frequency point signal;
the baseband module captures and tracks short message signals of a Beidou second satellite and a Beidou third satellite, analyzes and decodes the short message signals and then sends the short message signals to the control module; receiving a Beidou short message request instruction sent by a control module, if the Beidou short message request instruction is a Beidou second satellite inbound application, obtaining a transmission authentication code by a Beidou second SIM card and then coding according to a Beidou second short message coding format, and if the Beidou second SIM card is a Beidou third inbound application, obtaining a transmission authentication code by a Beidou third SIM card and then coding according to a Beidou third short message coding format;
the control module receives and packages and outputs the short message signals transmitted by the baseband module; receiving an input Beidou short message request instruction;
and the multiplexing transmitting module transmits the Beidou second short message and the Beidou third short message coded by the baseband circuit.
Further, the baseband module comprises a narrow-band interference resistant circuit, a splitter, a Beidou second baseband circuit and a Beidou third baseband circuit;
the anti-narrowband interference circuit filters the Beidou second short message S frequency point signal or the Beidou third short message S frequency point signal transmitted by the multiplexing receiving module;
the splitter splits the Beidou second short message S frequency point signal or the Beidou third short message S frequency point signal, and then respectively divides the first baseband circuit and the second baseband circuit;
the Beidou second baseband circuit captures and tracks the Beidou second short message signal, analyzes and decodes the Beidou second short message signal and then sends the Beidou second short message signal to the control module; receiving a Beidou second Beidou short message request instruction sent by a control module, and coding according to a Beidou second short message coding format after obtaining a transmission authentication code by a Beidou second SIM card;
the Beidou third baseband circuit captures and tracks the Beidou third short message signal, analyzes and decodes the Beidou third short message signal, transmits the Beidou third short message signal to the Beidou third SIM card for decryption, and sends the decrypted short message information to the control module; and receiving a Beidou third Beidou short message request instruction sent by the control module, and coding according to a Beidou third short message coding format after the Beidou third SIM card obtains a transmission authentication code.
Further, the Beidou second baseband circuit comprises 1 capturing unit, 10 tracking channels and 1 decoding unit; the capturing unit searches signals of 10 wave beams in series, after capturing a certain wave beam signal, the signals are sent to a corresponding tracking channel for loop tracking and holding, the extracted messages of the corresponding tracking channel are sent to the decoding unit in series for decoding, and the decoded messages are sent to the control module.
Further, the Beidou third baseband circuit comprises 1 capturing unit, 21 tracking channels and 1 decoding unit; the acquisition unit serially searches signals of 21 wave beams, after acquiring a certain wave beam signal, the signals are sent to a corresponding tracking channel for loop tracking and holding, the extracted messages of the corresponding tracking channel are serially submitted to the decoding unit for decoding, the decoded messages are sent to the Beidou No. three SIM card for decryption, and the decrypted short message information is sent to the control module.
Furthermore, the multiplexing receiving module comprises an S frequency point passive antenna, a low-noise amplifying circuit, a down-conversion circuit and an AD conversion circuit; the S frequency point passive antenna receives radio frequency signals transmitted by Beidou No. two and Beidou No. three satellites, the radio frequency signals are amplified through the low-noise amplification circuit, the down-conversion circuit converts the radio frequency signals into intermediate frequency signals after down-conversion, and the intermediate frequency signals are converted into digital signals through the AD conversion circuit.
Furthermore, the low-noise amplifying circuit adopts a three-stage amplifying circuit, and the 1 st stage gain is 15db, the 2 nd stage gain is 18db, and the 3 rd stage gain is 35 db.
Furthermore, the S-frequency passive antenna is designed to have a central frequency point of 2491.75MHz and a bandwidth of +8.16 MHz.
Furthermore, the multiplexing transmitting module comprises a DA conversion circuit, an up-conversion circuit, a power amplification circuit and an L frequency point passive antenna;
the short message coded by the baseband module is converted into an analog signal by a DA conversion circuit, is up-converted into a radio frequency signal by an up-conversion circuit, is amplified by a power amplification circuit and is transmitted by an L frequency point passive antenna.
Furthermore, the power of the power amplifying circuit is adjustable between 2 watts and 10 watts.
Furthermore, the inbound L frequency point Lf0 for the beidou second to send short message signals has a center frequency of 1615.68 ± 4.08MHz, the inbound frequency point Lf for the beidou third to send short message signals includes two frequency points Lf1 and Lf2, the center frequency of Lf1 is 1614.26 ± 4.08MHz, and the center frequency of Lf2 is 1618.34 ± 4.08 MHz.
The technical scheme of the invention has the following beneficial technical effects:
(1) the terminal provided by the invention supports the receiving and sending of the Beidou No. two and Beidou No. three short messages, has the characteristics of low equipment cost, small volume, low power consumption, high integration level and the like, and has greater industrial popularization value and obvious economic benefit.
(2) According to the Beidou second and third short messages, only one set of S frequency point antenna, low-noise amplification circuit, down-conversion circuit, AD circuit, L frequency point antenna, power amplification circuit, up-conversion circuit and DA circuit needs to be arranged through the multiplexing receiving and sending module, so that the circuit is simplified, and the cost is saved.
(3) According to the invention, the programs of the Beidou baseband module and the control module are improved, and two Beidou user SIM cards are connected at the same time, so that the functions of simultaneously supporting the Beidou second short message and the Beidou third short message are realized concisely and efficiently.
Drawings
FIG. 1: is a system block diagram of the terminal of the present invention;
FIG. 2: is a schematic outbound view of the present invention;
FIG. 3: is a Beidou second baseband outbound flow chart;
FIG. 4: is a Beidou No. three baseband outbound flow chart;
FIG. 5: is an inbound flow diagram for the terminal 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.
As shown in fig. 1, the present invention includes a multiplexing receiving module, a multiplexing transmitting module, a beidou second SIM card, a beidou third SIM card, a baseband module and a control module.
The multiplexing receiving module receives the Beidou second short message S frequency point signal and the Beidou third short message S frequency point signal.
In one embodiment, the multiplexing receiving module comprises an S-frequency passive antenna, a low-noise amplifying circuit, a down-conversion circuit and an AD conversion circuit; the S frequency point passive antenna receives radio frequency signals transmitted by Beidou No. two and Beidou No. three satellites, the radio frequency signals are amplified through the low-noise amplification circuit, the down-conversion circuit converts the radio frequency signals into intermediate frequency signals after down-conversion, and the intermediate frequency signals are converted into digital signals through the AD conversion circuit.
Furthermore, the S-frequency point passive antenna is designed to have a central frequency point of 2491.75MHz and a bandwidth of +/-8.16 MHz, and covers Beidou second short message receiving signals and Beidou third short message receiving signals. The S frequency point passive antenna is responsible for receiving the S frequency point short message signals of the Beidou second satellite and the S frequency point short message signals of the Beidou third satellite.
Furthermore, the S-frequency passive antenna connects the received signal with a low-noise amplifying circuit, the low-noise discharging circuit adopts a three-stage amplifying circuit, the 1 st stage gain is about 15db, the 2 nd stage gain is about 18db, the 3 rd stage gain is about 15db, the filter loss is deducted, and the total gain is about 35 db.
Further, the signal after low-noise amplification is connected to a down-conversion circuit, and the radio-frequency signal 2491.75MHz is down-converted to the intermediate-frequency signal 15.75 MHz. Furthermore, the intermediate frequency analog signal is accessed into the AD circuit, becomes a digital intermediate frequency signal and is accessed into the baseband circuit.
Furthermore, the signal frequency of the second Beidou S frequency point is 2491.75MHz +/-4.08 MHz, the signal frequency of the third Beidou S frequency point is 2491.75MHz +/-8.16 MHz, the S frequency point of the second Beidou and the central frequency point of the third Beidou S frequency point are consistent, and meanwhile, the bandwidth of the third Beidou is +/-8.16 MHz and covers +/-4.08 MHz of the second Beidou.
Furthermore, the signal part of the receiving link can be designed according to +/-8.16 MHz to be compatible with all functions of the Beidou I.
The baseband module captures and tracks short message signals of a Beidou second satellite and a Beidou third satellite, analyzes and decodes the short message signals and then sends the short message signals to the control module; and receiving a Beidou short message request instruction sent by the control module, if the Beidou short message request instruction is a Beidou second satellite inbound application, coding according to a Beidou second short message coding format after the Beidou second SIM card obtains the transmission authentication code, and if the Beidou third satellite inbound application, coding according to a Beidou third short message coding format after the Beidou third SIM card obtains the transmission authentication code.
In one embodiment, the baseband module comprises a narrow-band interference resisting circuit, a splitter, a Beidou No. two baseband circuit and a Beidou No. three baseband circuit.
And the narrow-band interference resisting circuit filters the Beidou second short message S frequency point signal or the Beidou third short message S frequency point signal transmitted by the multiplexing receiving module.
As shown in fig. 2, after the received intermediate frequency signal enters the baseband circuit, the narrowband interference rejection processing is performed first, which supports the interference processing of 10% in the band and improves the signal reception quality.
The branching unit branches the second Beidou short message S frequency point signal or the third Beidou short message S frequency point signal, and the signal after anti-interference processing passes through the branching unit, and is connected with the second Beidou baseband circuit all the way and is connected with the third Beidou baseband circuit all the way.
The Beidou second baseband circuit captures and tracks the Beidou second short message signal, analyzes and decodes the Beidou second short message signal and then sends the Beidou second short message signal to the control module; and receiving a Beidou second Beidou short message request instruction sent by the control module, and coding according to a Beidou second short message coding format after the Beidou second SIM card obtains the transmission authentication code.
In one embodiment, as shown in fig. 3, the beidou No. two baseband circuit includes 1 capturing unit, 10 tracking channels, and 1 decoding unit; the capturing unit searches signals of 10 wave beams in series, after capturing a certain wave beam signal, the signals are sent to a corresponding tracking channel for loop tracking and holding, the extracted messages of the corresponding tracking channel are sent to the decoding unit in series for decoding, and the decoded messages are sent to the control module for processing and are packed according to a user interface protocol and output to a user for use.
Furthermore, the Beidou third baseband circuit captures and tracks the Beidou third short message signal, analyzes and decodes the Beidou third short message signal, transmits the Beidou third short message signal to the Beidou third SIM card for decryption, and sends the decrypted short message information to the control module; and receiving a Beidou third Beidou short message request instruction sent by the control module, and coding according to a Beidou third short message coding format after the Beidou third SIM card obtains a transmission authentication code.
In one embodiment, as shown in fig. 4, the beidou No. three baseband circuit includes 1 capturing unit, 21 tracking channels, and 1 decoding unit; the acquisition unit serially searches signals of 21 wave beams, after acquiring a certain wave beam signal, the signals are sent to a corresponding tracking channel for loop tracking and holding, the message extracted by the corresponding tracking channel is serially submitted to the decoding unit for decoding, the user message information is obtained after decoding and is transmitted to the Beidou third SIM card for decryption, the decrypted message information is obtained, and the decrypted message information is packaged according to a user interface protocol through the singlechip processor and is output to a user for use.
The control module receives and packages and outputs the short message signals transmitted by the baseband module; and receiving an input Beidou short message request instruction.
In one embodiment, the control module adopts a single-chip processor. As shown in fig. 5, the external computer sends a beidou short message request instruction, and the single chip processor receives the short message request instruction to be sent, and determines whether the user selects a beidou second inbound application or a beidou third inbound application.
Further, if the Beidou second-number inbound application is adopted, the transmitting authentication code is obtained by interacting with the Beidou second-number subscriber SIM card.
Furthermore, in the Beidou baseband circuit, encoding is carried out according to the inbound encoding format of the Beidou second short message satellite system.
Further, if the Beidou third-number inbound application is adopted, the transmitting authentication code is obtained by interacting with the Beidou third-number subscriber SIM card.
Furthermore, in the Beidou baseband circuit, coding is carried out according to the inbound coding format of the Beidou third short message satellite system.
And the multiplexing transmitting module transmits the Beidou second short message and the Beidou third short message coded by the baseband circuit.
Furthermore, the multiplexing transmitting module comprises a DA conversion circuit, an up-conversion circuit, a power amplification circuit and an L-frequency passive antenna. The short message coded by the baseband module is converted into an analog signal by a DA conversion circuit, is up-converted into a radio frequency signal by an up-conversion circuit, is amplified by a power amplification circuit and is transmitted by an L frequency point passive antenna.
Further, the digital code signal is converted into an analog signal by a DA conversion circuit.
Furthermore, the Beidou second-number inbound L frequency point Lf0 has the center frequency of 1615.68 +/-4.08 MHz, the Beidou third-number inbound frequency point comprises two frequency points Lf1 and Lf2, the center frequency of Lf1 is 1614.26 +/-4.08 MHz, and the center frequency of Lf2 is 1618.34 +/-4.08 MHz. The intermediate frequency signal is stepped up to a radio frequency signal by an up-conversion circuit according to the frequency of the inbound signal.
Furthermore, the radio frequency signal enters a power amplifying circuit to amplify the signal, and the power amplifying circuit is designed into a 2-10 watt adjustable circuit to meet the requirements of different use scenes.
Further, the radio frequency signal amplified by the power amplification circuit is transmitted to a Beidou second satellite or a Beidou third satellite through the L frequency point antenna.
In summary, the invention discloses a terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages. The system comprises a multiplexing receiving module, a multiplexing transmitting module, a Beidou second SIM card, a Beidou third SIM card, a baseband module and a control module; the terminal realizes the receiving and sending functions of the Beidou second short message and the Beidou third short message. The terminal has the characteristics of low equipment cost, small volume, low power consumption, high integration level and the like, and has great industrial popularization value and remarkable economic benefit. The Beidou second and third short messages are multiplexed by the receiving and sending module, so that the circuit is simplified, and the cost is saved.
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 terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages is characterized by comprising a multiplexing receiving module, a multiplexing transmitting module, a Beidou No. two SIM card, a Beidou No. three SIM card, a baseband module and a control module;
the multiplexing receiving module receives the Beidou second short message S frequency point signal and the Beidou third short message S frequency point signal;
the baseband module captures and tracks short message signals of a Beidou second satellite and a Beidou third satellite, analyzes and decodes the short message signals and then sends the short message signals to the control module; receiving a Beidou short message request instruction sent by a control module, if the Beidou short message request instruction is a Beidou second satellite inbound application, obtaining a transmission authentication code by a Beidou second SIM card and then coding according to a Beidou second short message coding format, and if the Beidou second SIM card is a Beidou third inbound application, obtaining a transmission authentication code by a Beidou third SIM card and then coding according to a Beidou third short message coding format;
the control module receives and packages and outputs the short message signals transmitted by the baseband module; receiving an input Beidou short message request instruction;
and the multiplexing transmitting module transmits the Beidou second short message and the Beidou third short message coded by the baseband circuit.
2. The terminal capable of simultaneously supporting the Beidou second and third satellite short messages according to claim 1, wherein the baseband module comprises a narrow-band interference resisting circuit, a splitter, a Beidou second baseband circuit and a Beidou third baseband circuit;
the anti-narrowband interference circuit filters the Beidou second short message S frequency point signal or the Beidou third short message S frequency point signal transmitted by the multiplexing receiving module;
the splitter splits the Beidou second short message S frequency point signal or the Beidou third short message S frequency point signal, and then respectively divides the first baseband circuit and the second baseband circuit;
the Beidou second baseband circuit captures and tracks the Beidou second short message signal, analyzes and decodes the Beidou second short message signal and then sends the Beidou second short message signal to the control module; receiving a Beidou second Beidou short message request instruction sent by a control module, and coding according to a Beidou second short message coding format after obtaining a transmission authentication code by a Beidou second SIM card;
the Beidou third baseband circuit captures and tracks the Beidou third short message signal, analyzes and decodes the Beidou third short message signal, transmits the Beidou third short message signal to the Beidou third SIM card for decryption, and sends the decrypted short message information to the control module; and receiving a Beidou third Beidou short message request instruction sent by the control module, and coding according to a Beidou third short message coding format after the Beidou third SIM card obtains a transmission authentication code.
3. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 2, wherein the Beidou No. two baseband circuit comprises 1 capturing unit, 10 tracking channels and 1 decoding unit; the capturing unit searches signals of 10 wave beams in series, after capturing a certain wave beam signal, the signals are sent to a corresponding tracking channel for loop tracking and holding, the extracted messages of the corresponding tracking channel are sent to the decoding unit in series for decoding, and the decoded messages are sent to the control module.
4. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 3, wherein the Beidou No. three baseband circuit comprises 1 capturing unit, 21 tracking channels and 1 decoding unit; the acquisition unit serially searches signals of 21 wave beams, after acquiring a certain wave beam signal, the signals are sent to a corresponding tracking channel for loop tracking and holding, the extracted messages of the corresponding tracking channel are serially submitted to the decoding unit for decoding, the decoded messages are sent to the Beidou No. three SIM card for decryption, and the decrypted short message information is sent to the control module.
5. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 1 or 2, wherein the multiplexing receiving module comprises an S-frequency point passive antenna, a low-noise amplifying circuit, a down-conversion circuit and an AD conversion circuit; the S frequency point passive antenna receives radio frequency signals transmitted by Beidou No. two and Beidou No. three satellites, the radio frequency signals are amplified through the low-noise amplification circuit, the down-conversion circuit converts the radio frequency signals into intermediate frequency signals after down-conversion, and the intermediate frequency signals are converted into digital signals through the AD conversion circuit.
6. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 5, wherein the low-noise amplification circuit adopts a three-stage amplification circuit, and the 1 st stage gain is 15db, the 2 nd stage gain is 18db, and the 3 rd stage gain is 35 db.
7. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 5, wherein the S frequency point passive antenna is designed to have a central frequency point of 2491.75MHz and a bandwidth of +8.16 MHz.
8. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 1 or 2, wherein the multiplexing transmitting module comprises a DA conversion circuit, an up-conversion circuit, a power amplifying circuit and an L frequency point passive antenna;
the short message coded by the baseband module is converted into an analog signal by a DA conversion circuit, is up-converted into a radio frequency signal by an up-conversion circuit, is amplified by a power amplification circuit and is transmitted by an L frequency point passive antenna.
9. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 8, wherein the power of the power amplifying circuit is adjustable between 2 watts and 10 watts.
10. The terminal capable of simultaneously supporting Beidou No. two and Beidou No. three short messages according to claim 8, wherein the inbound L frequency point Lf0 for Beidou No. two short message signals is 1615.68 +/-4.08 MHz, the inbound frequency for Beidou No. three short message signals comprises two frequency points Lf1 and Lf2, the center frequency of Lf1 is 1614.26 +/-4.08 MHz, and the center frequency of Lf2 is 1618.34 +/-4.08 MHz.
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| CN115061161A (en) * | 2022-08-18 | 2022-09-16 | 北京天海达科技有限公司 | Detection device, method and system for interference signal |
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| CN109598908A (en) * | 2018-12-04 | 2019-04-09 | 北京天海达科技有限公司 | A kind of Beidou emergency rescue device and the rescue mode based on the device |
| CN109615841A (en) * | 2018-12-21 | 2019-04-12 | 国网思极神往位置服务（北京）有限公司 | Beidou multi-user card data transmission device and transmission method applied to FTU |
| CN111356095A (en) * | 2020-02-04 | 2020-06-30 | 北京天海达科技有限公司 | Beidou short message sharing terminal and Beidou short message receiving and sending method |
| CN112615664A (en) * | 2020-12-10 | 2021-04-06 | 北京天海达科技有限公司 | Beidou short message multi-card user machine and implementation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115061161A (en) * | 2022-08-18 | 2022-09-16 | 北京天海达科技有限公司 | Detection device, method and system for interference signal |
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| CN113301517B (en) | 2022-05-06 |
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