CN114362808A - Beidou civil short message region enhancement system - Google Patents
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Abstract
The invention discloses a Beidou civil short message regional enhancement system, which relates to the field of regional enhancement; the enhancement system comprises a signal forwarding subsystem carried on a flying platform and a ground central station carried on a maneuvering platform. Based on the principle of the Beidou civil short message service system, the simplified Beidou civil short message service system is designed, and Beidou civil short message regional enhanced service is realized. The invention realizes the civil short message in-and-out station signal forwarding function of the big Dipper system GEO satellite by using the signal forwarding subsystem carried on the suspension platform, and realizes the civil short message central station function of the big Dipper system by using the ground central station comprising the signal receiving subsystem, the system software and the signal transmitting subsystem. The civil short message in-and-out-of-station signal disclosed by the invention adopts a civil signal system published by a Beidou system, and can be compatible with the existing Beidou short message terminal. The implementation scheme of the invention has the characteristics of strong applicability and easy popularization.
Description
Technical Field
The invention relates to the field of regional enhancement, in particular to a Beidou civil short message regional enhancement system.
Background
The Beidou short message service is an important component of a Beidou navigation system, can provide large-capacity and real-time short message interaction capacity, is used as a standby or emergency means under the conditions of wartime or natural disasters and the like in the area which is difficult to be covered by a ground mobile communication network, and is also an important characteristic that Beidou is different from GPS.
The Beidou short message service only can cover Asia-Pacific areas, the coverage range is limited, and users outside the service area cannot enjoy the short message service. Meanwhile, in a service range, the big dipper short message service stability is poor because trees cover serious mountain areas, local areas with intentional or unintentional interference and the like. At this time, a beidou short message region enhancement system is needed to provide short message enhancement service in a specific region.
The current regional augmentation principle in the navigation field is that a user terminal utilizes differential information broadcast by a reference station to improve positioning accuracy, and the method mainly comprises satellite-based augmentation and ground-based augmentation according to the implementation form of the reference station. Because the number of short message users is relatively small and the short message service is specific to the Beidou system, the relevant research of the regional enhancement system aiming at the Beidou short message is not looked up in the published data.
Disclosure of Invention
In view of this, the present invention is directed to a beidou civil short message zone enhancement system designed to avoid the above drawbacks in the background art.
The technical scheme adopted by the invention is as follows:
a Beidou civil short message regional enhancement system comprises a signal forwarding subsystem carried on a flight platform and a ground central station carried on a maneuvering platform; wherein the content of the first and second substances,
the signal forwarding subsystem is used for receiving the civil short message inbound uplink signal of the user terminal in the enhanced area, forwarding and generating a civil short message inbound downlink signal, and transmitting the civil short message inbound downlink signal to the ground central station; simultaneously, receiving a civil short message outbound uplink signal transmitted by the ground central station, forwarding and generating a civil short message outbound downlink signal, and transmitting the civil short message outbound downlink signal to a user terminal in an enhanced area; wherein, the civil short message inbound uplink signal, the civil short message inbound downlink signal, the civil short message outbound uplink signal and the civil short message outbound downlink signal are all wireless signals;
the ground central station is used for receiving the civil short message inbound downlink signal forwarded by the signal forwarding subsystem, performing capture, tracking and demodulation processing to generate inbound information, generating a civil short message outbound uplink signal according to the inbound information, and sending the civil short message outbound uplink signal to the signal transmitting subsystem.
Furthermore, the signal forwarding subsystem comprises a first C-band transceiver antenna, an L/S-band transceiver antenna, a C-band low noise amplifier, an L-band low noise amplifier, a C-band power amplifier, an S-band power amplifier, a signal repeater L-C and a signal repeater C-S; wherein the content of the first and second substances,
the L/S frequency band receiving and transmitting antenna receives the civil short message inbound uplink signal of the user terminal in the enhancement area and sends the signal to the L frequency band low noise amplifier; the L-frequency-band low-noise amplifier amplifies the inbound uplink signal of the civil short message and sends the amplified signal to the signal transponder L-C; the signal transponder L-C converts the amplified inbound uplink signal from an L frequency band into a C frequency band to form a civil short message inbound downlink signal, and sends the civil short message inbound downlink signal to a C frequency band power amplifier; the C-band power amplifier amplifies the C-band signal output by the signal transponder L-C and then sends the amplified signal to the first C-band transceiving antenna; the first C frequency band transceiving antenna transmits the civil short message inbound downlink signal to the ground central station;
the first C frequency band receiving and transmitting antenna receives a civil short message outbound uplink signal transmitted by the ground station and transmits the civil short message outbound uplink signal to the C frequency band low noise amplifier; the C-band low-noise amplifier amplifies the civil short message outbound uplink signal and then sends the amplified signal to a signal repeater C-S; the signal repeater C-S converts the amplified outbound uplink signal from a C frequency band to an S frequency band to form a civil short message outbound downlink signal, and sends the civil short message outbound downlink signal to an S frequency band power amplifier; the S frequency band power amplifier amplifies the signals output by the signal transponder C-S and then sends the amplified signals to the L/S frequency band transceiving antenna; and the L/S frequency band transceiving antenna transmits the civil short message outbound downlink signal to the user terminal in the enhanced area.
Furthermore, the ground central station comprises a second C frequency band transceiving antenna, a signal receiving subsystem, a signal transmitting subsystem and a system software module; wherein the content of the first and second substances,
the second C-band transceiving antenna receives the civil short message inbound downlink signal forwarded by the signal forwarding subsystem and sends the signal to the signal receiving subsystem; the signal receiving subsystem carries out capturing, tracking and demodulating processing on the civil short message inbound downlink signal to generate inbound information which is sent to a system software module; the system software module generates outbound information according to the inbound information and sends the outbound information to the signal transmitting subsystem; the signal transmitting subsystem forms the outbound information into a civil short message outbound uplink signal and transmits the civil short message outbound uplink signal to the signal forwarding subsystem through the second C frequency band transceiving antenna.
Furthermore, the signal receiving subsystem comprises a low noise amplifier, a down converter, a signal acquisition and transmission terminal, an optical fiber shunt terminal, a fast capture terminal and k signal processing terminals; wherein the content of the first and second substances,
the low-noise amplifier receives the inbound downlink signal of the civil short message sent by the C-band receiving and sending antenna, and sends the inbound downlink signal to the down converter after amplification; the down converter down converts the radio frequency signal to an intermediate frequency, and sends the intermediate frequency signal to a signal acquisition and transmission terminal; the signal acquisition and transmission terminal converts the analog signal into an optical fiber digital signal and sends the optical fiber digital signal to the optical fiber shunt terminal; the optical fiber branching terminal equally divides the optical fiber digital signal into k +1 parts, wherein 1 part is sent to the rapid capturing terminal, and k parts are respectively sent to the signal processing terminals 1-k; the signal processing terminal respectively carries out tracking demodulation and decoding processing on the optical fiber digital signal according to the capture information of the quick capture terminal, obtains inbound information, packs the inbound information and reports the inbound information to the system software module; wherein, the value calculation mode of k is as follows:
introducing an Euler-B formula:
k is a minimum integer not less than N/m;
where, a ═ λ t is the traffic, m is the number of channels of the signal processing terminal, B is the channel blocking rate of the system, N is the number of branches, t is the average length of the signal, and λ is the number of signals allowed to enter per unit time.
Furthermore, the system software module comprises a receiving monitoring and service processing module, a signal processing module and a transmitting monitoring and service processing module; wherein the content of the first and second substances,
the receiving monitoring and service processing module receives the inbound information input by the signal receiving subsystem, performs classified storage and display, and packages the inbound information according to a protocol and sends the inbound information to the signal processing module; the signal processing module analyzes the inbound information, analyzes a sender user ID, a receiver user ID, an outbound beam, an inbound information type and short message content, and packages and sends the short message content into the transmission monitoring and service processing module according to a protocol; and the emission monitoring and service processing module packs the contents to be sent according to a protocol, generates outbound information and sends the outbound information to the signal emission subsystem.
Furthermore, the signal transmitting subsystem comprises a signal transmitting terminal, an up-converter and a power amplifier; wherein the content of the first and second substances,
the signal transmitting terminal frames, codes and spreads the information according to the received outbound information, forms a civil short message outbound intermediate frequency signal according to fixed time and sends the signal into an up-converter; the up-converter up-converts the civil short message outbound intermediate frequency signal to a C frequency band radio frequency, and sends the signal to a power amplifier; the power amplifier amplifies the outbound uplink signal of the C-band radio frequency civil short message and then sends the amplified uplink signal to the C-band receiving and sending antenna.
Compared with the background technology, the invention has the following advantages:
(i) the Beidou civil short message region enhancement system provided by the invention is based on the principle of the Beidou civil short message service system, designs a simplified Beidou civil short message service system, realizes Beidou civil short message region enhancement service, and has the characteristics of simplicity and practicability.
(ii) The Beidou civil short message area enhancement system provided by the invention realizes the civil short message in-and-out station signal forwarding function of the Beidou system GEO satellite by using the signal forwarding subsystem carried on the suspension platform, and realizes the civil short message central station function of the Beidou system by using the ground central station comprising the signal receiving subsystem, the system software and the signal transmitting subsystem.
(iii) According to the civil Beidou short message region enhancement system, the civil short message in-and-out station signal disclosed by the Beidou system is adopted, the civil signal system disclosed by the Beidou system is compatible with the existing Beidou short message terminal, namely the existing Beidou short message terminal can be accessed to the system without any change, and the civil Beidou short message region enhancement system has the characteristics of strong applicability and easiness in popularization.
Drawings
FIG. 1 is a schematic diagram of a Beidou civil short message area enhancement system designed by the present invention;
FIG. 2 is a block diagram of a Beidou civil short message area enhancement system designed by the present invention;
FIG. 3 is a block diagram of a signal forwarding subsystem designed by the present invention;
fig. 4 is a block diagram of a ground center designed according to the present invention.
Detailed Description
The working schematic diagram of the Beidou civil short message regional enhancement system designed by the invention is shown in figure 1, and the system block diagram is shown in figure 2, and the Beidou civil short message regional enhancement system mainly comprises a signal forwarding subsystem and a ground central station. The specific implementation scheme is as follows:
moving a ground central station (which is designed in a vehicle-mounted form for increasing the system maneuverability) to an area needing Beidou civil short message enhancement, lifting a suspension platform (such as a helicopter, an unmanned aerial vehicle and the like) carrying a signal forwarding subsystem to a height h, and transferring the designed signal to a platformSending the visual angle of elevation theta of system L/S frequency channel receiving and dispatching antenna, in order to increase the service range of system and simplify the use procedure of system, propose the antenna design to be the omnidirectional antenna, the marginal distance signal of service range transmits the subsystem distance L ═ h/sin (theta) (need use while calculating the system link), service range R ═ pi (h/tan (theta))2The system may provide enhanced services to users within the range.
The signal forwarding subsystem is used for receiving the civil short message inbound uplink signal of the user terminal in the enhanced area, forwarding and generating a civil short message inbound downlink signal, and transmitting the civil short message inbound downlink signal to the ground central station; simultaneously, receiving a civil short message outbound uplink signal transmitted by the ground central station, forwarding and generating a civil short message outbound downlink signal, and transmitting the civil short message outbound downlink signal to a user terminal in an enhanced area; wherein, the civil short message inbound uplink signal, the civil short message inbound downlink signal, the civil short message outbound uplink signal and the civil short message outbound downlink signal are all wireless signals;
the ground central station is used for receiving the civil short message inbound downlink signal forwarded by the signal forwarding subsystem, performing capture, tracking and demodulation processing to generate inbound information, generating a civil short message outbound uplink signal according to the inbound information, and sending the civil short message outbound uplink signal to the signal transmitting subsystem.
The signal forwarding subsystem is shown in a block diagram in fig. 3, and comprises a first C-band transceiving antenna, an L/S-band transceiving antenna, a C-band low-noise amplifier, an L-band low-noise amplifier, a C-band power amplifier, an S-band power amplifier, a signal repeater L-C and a signal repeater C-S; wherein the content of the first and second substances,
the L/S frequency band receiving and transmitting antenna receives the civil short message inbound uplink signal of the user terminal in the enhancement area and sends the signal to the L frequency band low noise amplifier; the L-frequency-band low-noise amplifier amplifies the inbound uplink signal of the civil short message and sends the amplified signal to the signal transponder L-C; the signal transponder L-C converts the amplified inbound uplink signal from an L frequency band into a C frequency band to form a civil short message inbound downlink signal, and sends the civil short message inbound downlink signal to a C frequency band power amplifier; the C-band power amplifier amplifies the C-band signal output by the signal transponder L-C and then sends the amplified signal to the first C-band transceiving antenna; the first C frequency band transceiving antenna transmits the civil short message inbound downlink signal to the ground central station;
the first C frequency band receiving and transmitting antenna receives a civil short message outbound uplink signal transmitted by the ground station and transmits the civil short message outbound uplink signal to the C frequency band low noise amplifier; the C-band low-noise amplifier amplifies the civil short message outbound uplink signal and then sends the amplified signal to a signal repeater C-S; the signal repeater C-S converts the amplified outbound uplink signal from a C frequency band to an S frequency band to form a civil short message outbound downlink signal, and sends the civil short message outbound downlink signal to an S frequency band power amplifier; the S frequency band power amplifier amplifies the signals output by the signal transponder C-S and then sends the amplified signals to the L/S frequency band transceiving antenna; and the L/S frequency band transceiving antenna transmits the civil short message outbound downlink signal to the user terminal in the enhanced area.
The ground central station block diagram is shown in fig. 4, and includes a second C-band transceiving antenna, a signal receiving subsystem, a signal transmitting subsystem, and a system software module; wherein the content of the first and second substances,
the second C-band transceiving antenna receives the civil short message inbound downlink signal forwarded by the signal forwarding subsystem and sends the signal to the signal receiving subsystem; the signal receiving subsystem carries out capturing, tracking and demodulating processing on the civil short message inbound downlink signal to generate inbound information which is sent to a system software module; the system software module generates outbound information according to the inbound information and sends the outbound information to the signal transmitting subsystem; the signal transmitting subsystem forms the outbound information into a civil short message outbound uplink signal and transmits the civil short message outbound uplink signal to the signal forwarding subsystem through the second C frequency band transceiving antenna.
The signal receiving subsystem comprises a low noise amplifier, a down converter, a signal acquisition and transmission terminal, an optical fiber shunt terminal, a quick capture terminal and k signal processing terminals; the low noise amplifier receives a civil short message inbound downlink signal sent by the C-band receiving and sending antenna, and sends the signal to the down converter after amplification; the down converter down converts the radio frequency signal to an intermediate frequency, and sends the intermediate frequency signal to a signal acquisition and transmission terminal; the signal acquisition and transmission terminal converts the analog signal into an optical fiber digital signal and sends the optical fiber digital signal to the optical fiber shunt terminal; the optical fiber branching terminal equally divides the optical fiber digital signal into k +1 parts, wherein 1 part is sent to the rapid capturing terminal, and k parts are respectively sent to the signal processing terminals 1-k; the signal processing terminal respectively carries out tracking demodulation and decoding processing on the optical fiber digital signal according to the capture information of the quick capture terminal, obtains inbound information, packs the inbound information and reports the inbound information to the system software module; wherein, the value calculation mode of k is as follows:
introducing an Euler-B formula:
k is a minimum integer not less than N/m;
where, a ═ λ t is the traffic, m is the number of channels of the signal processing terminal, B is the channel blocking rate of the system, N is the number of branches, t is the average length of the signal, and λ is the number of signals allowed to enter per unit time.
The system software module comprises a receiving monitoring and service processing module, a signal processing module and a transmitting monitoring and service processing module; the receiving monitoring and service processing module receives the inbound information input by the signal receiving subsystem, performs classified storage and display, and packages the inbound information according to a protocol and sends the inbound information to the signal processing module; the signal processing module analyzes the inbound information, analyzes a sender user ID, a receiver user ID, an outbound beam, an inbound information type and short message content, and packages and sends the short message content into the transmission monitoring and service processing module according to a protocol; and the emission monitoring and service processing module packs the contents to be sent according to a protocol, generates outbound information and sends the outbound information to the signal emission subsystem.
The signal transmitting subsystem comprises a signal transmitting terminal, an up-converter and a power amplifier; the signal transmitting terminal frames, codes and spreads the information according to the received outbound information, forms a civil short message outbound intermediate frequency signal according to fixed time and sends the signal into an up-converter; the up-converter up-converts the civil short message outbound intermediate frequency signal to a C frequency band radio frequency, and sends the signal to a power amplifier; the power amplifier amplifies the outbound uplink signal of the C-band radio frequency civil short message and then sends the amplified uplink signal to the C-band receiving and sending antenna.
The invention realizes the principle that: based on the principle of the Beidou civil short message service system, the simplified Beidou civil short message service system is designed, and Beidou civil short message regional enhanced service is realized. The invention realizes the civil short message in-and-out station signal forwarding function of the big Dipper system GEO satellite by using the signal forwarding subsystem carried on the suspension platform, and realizes the civil short message central station function of the big Dipper system by using the ground central station comprising the signal receiving subsystem, the system software and the signal transmitting subsystem. The civil short message in-and-out-of-station signal disclosed by the invention adopts a civil signal system published by a Beidou system, and can be compatible with the existing Beidou short message terminal.
In addition to the above-described implementation steps, other implementations of the present invention are possible. All technical solutions which adopt equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. A Beidou civil short message regional enhancement system is characterized by comprising a signal forwarding subsystem carried on a flight platform and a ground central station carried on a maneuvering platform; wherein the content of the first and second substances,
the signal forwarding subsystem is used for receiving the civil short message inbound uplink signal of the user terminal in the enhanced area, forwarding and generating a civil short message inbound downlink signal, and transmitting the civil short message inbound downlink signal to the ground central station; simultaneously, receiving a civil short message outbound uplink signal transmitted by the ground central station, forwarding and generating a civil short message outbound downlink signal, and transmitting the civil short message outbound downlink signal to a user terminal in an enhanced area; wherein, the civil short message inbound uplink signal, the civil short message inbound downlink signal, the civil short message outbound uplink signal and the civil short message outbound downlink signal are all wireless signals;
the ground central station is used for receiving the civil short message inbound downlink signal forwarded by the signal forwarding subsystem, performing capture, tracking and demodulation processing to generate inbound information, generating a civil short message outbound uplink signal according to the inbound information, and sending the civil short message outbound uplink signal to the signal transmitting subsystem.
2. The Beidou civil short message area enhancement system according to claim 1, wherein the signal forwarding subsystem comprises a first C frequency band transceiving antenna, an L/S frequency band transceiving antenna, a C frequency band low noise amplifier, an L frequency band low noise amplifier, a C frequency band power amplifier, an S frequency band power amplifier, a signal repeater L-C and a signal repeater C-S; wherein the content of the first and second substances,
the L/S frequency band receiving and transmitting antenna receives the civil short message inbound uplink signal of the user terminal in the enhancement area and sends the signal to the L frequency band low noise amplifier; the L-frequency-band low-noise amplifier amplifies the inbound uplink signal of the civil short message and sends the amplified signal to the signal transponder L-C; the signal transponder L-C converts the amplified inbound uplink signal from an L frequency band into a C frequency band to form a civil short message inbound downlink signal, and sends the civil short message inbound downlink signal to a C frequency band power amplifier; the C-band power amplifier amplifies the C-band signal output by the signal transponder L-C and then sends the amplified signal to the first C-band transceiving antenna; the first C frequency band transceiving antenna transmits the civil short message inbound downlink signal to the ground central station;
the first C frequency band receiving and transmitting antenna receives a civil short message outbound uplink signal transmitted by the ground station and transmits the civil short message outbound uplink signal to the C frequency band low noise amplifier; the C-band low-noise amplifier amplifies the civil short message outbound uplink signal and then sends the amplified signal to a signal repeater C-S; the signal repeater C-S converts the amplified outbound uplink signal from a C frequency band to an S frequency band to form a civil short message outbound downlink signal, and sends the civil short message outbound downlink signal to an S frequency band power amplifier; the S frequency band power amplifier amplifies the signals output by the signal transponder C-S and then sends the amplified signals to the L/S frequency band transceiving antenna; and the L/S frequency band transceiving antenna transmits the civil short message outbound downlink signal to the user terminal in the enhanced area.
3. The Beidou civil short message area enhancement system according to claim 1, wherein the ground central station comprises a second C frequency band transceiving antenna, a signal receiving subsystem, a signal transmitting subsystem and a system software module; wherein the content of the first and second substances,
the second C-band transceiving antenna receives the civil short message inbound downlink signal forwarded by the signal forwarding subsystem and sends the signal to the signal receiving subsystem; the signal receiving subsystem carries out capturing, tracking and demodulating processing on the civil short message inbound downlink signal to generate inbound information which is sent to a system software module; the system software module generates outbound information according to the inbound information and sends the outbound information to the signal transmitting subsystem; the signal transmitting subsystem forms the outbound information into a civil short message outbound uplink signal and transmits the civil short message outbound uplink signal to the signal forwarding subsystem through the second C frequency band transceiving antenna.
4. The Beidou civil short message area enhancement system according to claim 3, wherein the signal receiving subsystem comprises a low noise amplifier, a down converter, a signal acquisition and transmission terminal, an optical fiber branching terminal, a fast capturing terminal and k signal processing terminals; wherein the content of the first and second substances,
the low-noise amplifier receives the inbound downlink signal of the civil short message sent by the C-band receiving and sending antenna, and sends the inbound downlink signal to the down converter after amplification; the down converter down converts the radio frequency signal to an intermediate frequency, and sends the intermediate frequency signal to a signal acquisition and transmission terminal; the signal acquisition and transmission terminal converts the analog signal into an optical fiber digital signal and sends the optical fiber digital signal to the optical fiber shunt terminal; the optical fiber branching terminal equally divides the optical fiber digital signal into k +1 parts, wherein 1 part is sent to the rapid capturing terminal, and k parts are respectively sent to the signal processing terminals 1-k; the signal processing terminal respectively carries out tracking demodulation and decoding processing on the optical fiber digital signal according to the capture information of the quick capture terminal, obtains inbound information, packs the inbound information and reports the inbound information to the system software module; wherein, the value calculation mode of k is as follows:
introducing an Euler-B formula:
k is a minimum integer not less than N/m;
where, a ═ λ t is the traffic, m is the number of channels of the signal processing terminal, B is the channel blocking rate of the system, N is the number of branches, t is the average length of the signal, and λ is the number of signals allowed to enter per unit time.
5. The Beidou civil short message area enhancement system according to claim 3, wherein the system software modules comprise a receiving monitoring and service processing module, a signal processing module and a transmitting monitoring and service processing module; wherein the content of the first and second substances,
the receiving monitoring and service processing module receives the inbound information input by the signal receiving subsystem, performs classified storage and display, and packages the inbound information according to a protocol and sends the inbound information to the signal processing module; the signal processing module analyzes the inbound information, analyzes a sender user ID, a receiver user ID, an outbound beam, an inbound information type and short message content, and packages and sends the short message content into the transmission monitoring and service processing module according to a protocol; and the emission monitoring and service processing module packs the contents to be sent according to a protocol, generates outbound information and sends the outbound information to the signal emission subsystem.
6. The Beidou civil short message area enhancement system according to claim 3, wherein the signal transmitting subsystem comprises a signal transmitting terminal, an up-converter and a power amplifier; wherein the content of the first and second substances,
the signal transmitting terminal frames, codes and spreads the information according to the received outbound information, forms a civil short message outbound intermediate frequency signal according to fixed time and sends the signal into an up-converter; the up-converter up-converts the civil short message outbound intermediate frequency signal to a C frequency band radio frequency, and sends the signal to a power amplifier; the power amplifier amplifies the outbound uplink signal of the C-band radio frequency civil short message and then sends the amplified uplink signal to the C-band receiving and sending antenna.
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| CN117278949A (en) * | 2023-11-17 | 2023-12-22 | 中国人民解放军国防科技大学 | Beidou short message communication method and system for low-power consumption user terminal |
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