CN111953406B - Cross-platform fusion communication method in satellite-ground integrated frequency hopping satellite system - Google Patents
Cross-platform fusion communication method in satellite-ground integrated frequency hopping satellite system Download PDFInfo
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- CN111953406B CN111953406B CN202010842773.XA CN202010842773A CN111953406B CN 111953406 B CN111953406 B CN 111953406B CN 202010842773 A CN202010842773 A CN 202010842773A CN 111953406 B CN111953406 B CN 111953406B
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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
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- H—ELECTRICITY
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- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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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
- H04B7/18517—Transmission equipment in earth stations
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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
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Abstract
The invention discloses a cross-platform fusion communication method in a satellite-ground integrated frequency hopping satellite system, and belongs to the technical field of satellite communication. The method aims at the comprehensive application of different types of platforms such as vehicles, ships, helicopters, unmanned aerial vehicles and the like in a satellite-ground integrated frequency hopping satellite communication system, and is suitable for the special requirements of different types of platforms through the design of uplink and downlink transmission parameter configuration according to needs, uplink carrier group and downlink carrier internal time slot division and allocation, uplink and downlink transmission parameter time slot-by-time slot variation and the like, so that the cross-platform fusion communication based on unified carriers and signal frames in the uplink and downlink is realized. The invention can reduce the complexity and cost of equipment realization and simultaneously improve the utilization rate of system resources and the flexibility of platform application under the condition of meeting the comprehensive application requirements of various platforms.
Description
Technical Field
The invention relates to a cross-platform fusion communication method in a satellite-ground integrated frequency hopping satellite system, belonging to the technical field of satellite communication.
Background
With the expansion of application requirements and the development and construction of satellite communication systems, the application of satellite communication in the civil field is increasingly wide, and the application of satellite communication from ground fixing to various platforms such as vehicles, ships, airplanes and the like is gradually expanded. Therefore, the particularity of different platforms such as vehicles, ships, helicopters and unmanned aerial vehicles is fully considered when the satellite communication system is required to be designed so as to meet the satellite communication use requirements of various platforms.
At present, in satellite communication, different frequency bands of a transparent transponder are mainly used for different types of platforms, and different carriers and different transmission methods are designed to meet the special requirements of the different types of platforms. For example, helicopter platforms with rotor blades that are blocked cause periodic signal attenuation, and transmission methods based on low-rate channel coding and interleaving techniques are generally used; remote control signals of the unmanned aerial vehicle platform require safe and reliable transmission, and a transmission method based on a spread spectrum technology is generally adopted.
The applications of the multiple platforms use multiple transmission methods, and different transmission methods form a system, so that the intercommunication among different platforms and the comprehensive application of the multiple platforms are not facilitated. In addition, in a processing and forwarding satellite communication system, the complexity and cost of satellite and ground equipment can be increased by applying ideas of multiple platforms based on multiple carriers and multiple transmission methods, and resource utilization rates of satellite power, frequency and the like are reduced.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a cross-platform fusion communication method in a satellite-ground integrated frequency hopping satellite system.
In order to achieve the purpose, the invention adopts the technical scheme that:
a cross-platform fusion communication method in a satellite-to-ground integrated frequency hopping satellite system is characterized in that an uplink from a user station to a satellite adopts MF-TDMA multiple access and frequency hopping modes, a plurality of carriers form 1 uplink carrier group, and each carrier in the carrier group carries out synchronous frequency hopping; the downlink from the satellite to the user station adopts a single carrier TDMA and frequency hopping mode, and the downlink carrier waves carry out frequency hopping; the method specifically comprises the following steps:
the method comprises the following steps: the user station loaded on different platforms is based on platform type, user station capability, service type and information speedSelecting an uplink parameter set p from the uplink parameter set U and a downlink parameter set D, respectivelyuAnd a downlink parameter set pdDetermining coding, interleaving, modulation, spreading and symbol rate used in information transmission; wherein, U ═ { p ═ puI p for uplink, D ═ p { [ p ]dP for downlink, p is a set of transmission parameters, p ═ R (R)cod,Ncod,Dint,M,L,Rs)，RcodRepresenting the code rate, NcodIndicating the code length, DintIndicating the interleaving depth, M the modulation order, L the spreading ratio, RsRepresents a symbol rate;
step two: the user station loaded on different platforms packages the service type, the information rate and the transmission parameter into a service application message and sends the message to the satellite;
step three: after receiving the service application message, the satellite extracts the service type, the information rate and the transmission parameters in the message, allocates carriers and time slot resources in an uplink carrier group and time slot resources in a downlink carrier for the subscriber station according to the extracted information, and sends the allocation result to the subscriber station through the resource allocation message;
step four: receiving resource allocation information by user stations loaded on different platforms, and acquiring uplink carrier and time slot resources and downlink time slot resources of the station;
step five: the service information to be sent is carried by the subscriber station loaded on different platforms according to the uplink parameter group puProcessing the parameters and sending frequency hopping signals in the allocated uplink carrier and time slot; at the same time, the subscriber station receives the frequency hopping signal in the allocated downlink time slot and according to the downlink parameter set pdThe parameters in (3) process the received signal and recover the service information.
Furthermore, each carrier in the uplink carrier group divides time slots by taking a frame as a period, each frame comprises a synchronous time slot, a control time slot and a plurality of service time slots, and each service time slot comprises multiple hops.
Furthermore, the downlink carrier divides time slots by taking a frame as a period, each frame comprises a synchronous time slot, a control time slot and a plurality of service time slots, and each service time slot comprises a plurality of hops.
Compared with the prior art, the invention has the following beneficial effects:
1. the uplink and the downlink of the invention both support various different transmission parameter groups, and different time slots in the uplink carrier group and the downlink carrier can use different transmission parameters, thereby ensuring that different types of platforms can use proper transmission parameters in different time slots and being capable of adapting to the specificity of the different types of platforms.
2. According to the invention, the unified uplink carrier wave group and signal frame and the unified downlink carrier wave and signal frame are used for signal transmission of different types of platforms, so that the satellite and the ground equipment can support different platform applications based on unified signal processing, the realization complexity of the equipment is facilitated to be simplified, the equipment cost is reduced, and the application flexibility is improved.
Drawings
Fig. 1 is a schematic view of an application scenario of a communication method in an embodiment of the present invention.
Fig. 2 is a diagram of a structure of a frequency hopping uplink carrier group and a signal frame in an embodiment of the present invention.
Fig. 3 is a diagram of a frame structure of a frequency hopping downlink carrier signal in an embodiment of the present invention.
Fig. 4 is a flow chart of a communication method in an embodiment of the invention.
Fig. 5 is a schematic diagram of uplink cross-platform converged communication in the embodiment of the present invention.
Fig. 6 is a schematic diagram of downlink cross-platform converged communication in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. It should be particularly noted that in the following description, a detailed description of known functions and designs will be omitted herein when it may obscure the subject matter of the present invention.
A cross-platform fusion communication method in a satellite-ground integrated frequency hopping satellite system is characterized in that an uplink from a user station to a satellite adopts MF-TDMA multiple access and frequency hopping technology, N carriers form 1 uplink carrier group, and each carrier in the carrier group carries out synchronous frequency hopping; the downlink from the satellite to the user station adopts a single carrier TDMA and frequency hopping technology, and the downlink carrier waves carry out frequency hopping;
wherein, the uplink and the downlink can use various transmission parameters such as different codes, interweaving, modulation, spread spectrum, symbol rate, etc.; defining a transmission parameter set p ═ (R)cod,Ncod,Dint,M,L,Rs) Wherein R iscodRepresenting the code rate, NcodIndicating the code length, DintIndicating the interleaving depth, M the modulation order, L the spreading ratio, RsRepresents a symbol rate; the transmission parameter group that can be used by the uplink constitutes a parameter group set U, and the transmission parameter group that can be used by the downlink constitutes a parameter group set D;
each carrier in the uplink carrier group divides time slots by taking a frame as a period, each frame comprises a synchronous time slot, a control time slot and X service time slots, and each service time slot comprises H1Hopping, and any one transmission parameter group in the set U can be used in each service time slot; the downlink carrier wave takes a frame as a period to divide time slots, each frame comprises a synchronous time slot, a control time slot and Y service time slots, and each service time slot comprises H2And hopping, and any one transmission parameter group in the set D can be used in each traffic slot.
As shown in fig. 4, the method specifically includes the following steps:
the method comprises the following steps: selecting suitable uplink parameter group p from parameter group sets U and D by the user station loaded on different platforms according to platform type, user station capability, service type, information rate and other informationuAnd a downlink parameter set pdDetermining parameters such as coding, interleaving, modulation, spread spectrum, symbol rate and the like used in information transmission;
step two: the user station loaded on different platforms packages the information of service type, information rate, transmission parameters and the like into service application information and sends the information to the satellite;
step three: after receiving the service application message, the satellite extracts information such as service type, information rate, transmission parameters and the like in the message, allocates carriers and time slot resources in an uplink carrier group and time slot resources in a downlink carrier for the subscriber station according to the extracted information, and sends the allocation result to the subscriber station through the resource allocation message;
step four: receiving resource allocation information by user stations loaded on different platforms, and acquiring uplink carrier and time slot resources and downlink time slot resources of the station;
step five: the service information to be sent is carried by the subscriber station loaded on different platforms according to the uplink parameter group puProcessing the parameters and sending frequency hopping signals in the allocated uplink carrier and time slot; at the same time, the subscriber station receives the frequency hopping signal in the allocated downlink time slot and according to the downlink parameter set pdThe parameters in (3) process the received signal and recover the service information.
The following is a more specific example:
a cross-platform fusion communication method in a satellite-ground integrated frequency hopping satellite system is disclosed, wherein an uplink from a user station to a satellite adopts MF-TDMA multiple access and frequency hopping technology, N carriers form 1 uplink carrier group, and each carrier in the carrier group carries out synchronous frequency hopping; the transmission parameter that can be used by the carriers in the uplink carrier group is K1Groups forming a set of uplink parameter sets
The structure of the uplink carrier group and the signal frame is shown in fig. 2, each frame includes 40 service time slots, each service time slot includes 3 hops, and each service time slot can use any one transmission parameter group in the set U for transmission;
the downlink from the satellite to the user station adopts a single carrier TDMA and frequency hopping technology, and the downlink carrier waves carry out frequency hopping; the transmission parameter that can be used by the downlink carrier wave is K2Groups, constituting a set of downlink parameter sets
The downlink carrier signal frame structure is shown in fig. 3, each frame includes 120 service time slots, and each serviceThe time slot comprises 1 hop, and each service time slot can use any one transmission parameter group in the set D for transmission;
fig. 1 is a schematic view of an application scenario of the method, in which 3 types of platforms such as a ship, a helicopter, and an unmanned aerial vehicle are considered, and 3 user stations loaded on the ship, the helicopter, and the unmanned aerial vehicle are respectively marked as an a station, a B station, and a C station. In the application scenario shown in fig. 1, the method includes the following steps:
selecting proper uplink parameter group and downlink parameter group from parameter group sets U and D by a station A, a station B and a station C according to information such as platform type, user station capability, service type, information rate and the like of the stations A, B and C, and determining parameters such as coding, interweaving, modulation, spread spectrum, symbol rate and the like used in information transmission;
wherein, the A station loaded on the ship platform needs to transmit data service in two directions, and the platform has no special requirement, therefore, the uplink parameter group is selected
And downlink parameter set
A station B loaded on a helicopter platform needs to transmit voice service in two directions, and the platform requires signal transmission to overcome the rotor wing shielding effect, so that an uplink parameter set is selected
And downlink parameter set
The C station loaded on the unmanned aerial vehicle platform needs to receive remote control information and send image data, and the platform requires safe and reliable transmission of downlink signals from a satellite to the unmanned aerial vehicle, so that an uplink link parameter group is selected
And downlink parameter set
And step two, the station A, the station B and the station C respectively encapsulate information such as service type, information rate, transmission parameters and the like into service application messages and send the messages to the satellite.
After receiving the service application message, the satellite extracts information such as service types, information rates, transmission parameters and the like in the message, allocates carriers and time slot resources in an uplink carrier group and time slot resources in a downlink carrier group for the station A, the station B and the station C according to the extracted information, and sends an allocation result to the subscriber station through the resource allocation message;
in the embodiment, a station A is allocated with time slots 1-6 in an uplink carrier 1 and is allocated with downlink time slots 1-3; allocating time slots 5-6 in an uplink carrier 2 and allocating a downlink time slot 4 for a station B; and allocating time slots 7-9 in the uplink carrier 2 and allocating downlink time slots 5-6 for the station C.
Step four: and the station A, the station B and the station C respectively receive the resource allocation message and acquire the uplink carrier and the time slot resource and the downlink time slot resource of the station.
Step five: the station A, the station B and the station C respectively process the service information to be sent according to the parameters in the selected uplink parameter group and send frequency hopping signals in the allocated uplink carrier and time slot; meanwhile, the station A, the station B and the station C respectively receive frequency hopping signals in the allocated downlink time slots, process the received signals according to the parameters in the selected downlink parameter group and recover service information;
in the embodiment, the A station transmits the uplink service information according to
After the parameters in (1) are processed, sending frequency hopping signals in time slots 1-6 in an uplink carrier 1; and according to the received signals in the downlink time slots 1-3
The parameters in (4) are processed to obtain downlink service information. B station to uplink service information according to
After the parameters in (3) are processed, sending a frequency hopping signal in a time slot 5-6 of an uplink carrier 2; and according to the received signal in the downlink time slot 4
The parameters in (4) are processed to obtain downlink service information. C station to uplink service information according to
After the parameters in (3) are processed, sending a frequency hopping signal in a time slot 7-9 in an uplink carrier 2; and according to the received signal in the downlink time slot 5-6
The parameters in (4) are processed to obtain downlink service information. The uplink and downlink cross-platform converged communication diagrams are shown in fig. 5 and 6.
In a word, aiming at the comprehensive application of different types of platforms such as vehicles, ships, helicopters, unmanned aerial vehicles and the like in a satellite-ground integrated frequency hopping satellite communication system, the method adapts to the special requirements of different types of platforms through the design of uplink and downlink transmission parameter configuration according to needs, uplink carrier group and downlink carrier time slot division and allocation, uplink and downlink transmission parameter time slot-by-time slot change and the like, and realizes the cross-platform fusion communication based on uniform carriers and signal frames in the uplink and downlink. The invention can reduce the complexity and cost of equipment realization and simultaneously improve the utilization rate of system resources and the flexibility of platform application under the condition of meeting the comprehensive application requirements of various platforms.
The above description is only one specific embodiment of the present invention, but the scope of the present invention is not limited thereto. Any equivalent replacement or change made by the technical solution of the present invention and the inventive concept thereof by those skilled in the art should be covered within the protection scope of the present invention.
Claims (1)
1. A cross-platform fusion communication method in a satellite-ground integrated frequency hopping satellite system is characterized in that signal transmission of different types of platforms uses unified uplink carrier wave groups and signal frames and unified downlink carrier waves and signal frames, an uplink from a user station to a satellite adopts an MF-TDMA multiple access and frequency hopping mode, a plurality of carrier waves form 1 uplink carrier wave group, and each carrier wave in the carrier wave group carries out synchronous frequency hopping; the downlink from the satellite to the user station adopts a single carrier TDMA and frequency hopping mode, and the downlink carrier waves carry out frequency hopping; each carrier in the uplink carrier group divides time slots by taking a frame as a period, each frame comprises a synchronous time slot, a control time slot and a plurality of service time slots, and each service time slot comprises a plurality of hops; the downlink carrier wave divides time slots by taking a frame as a period, each frame comprises a synchronous time slot, a control time slot and a plurality of service time slots, and each service time slot comprises a plurality of hops; the method comprises the following steps:
the method comprises the following steps: the user station loaded on different platforms selects the uplink parameter group p from the uplink parameter group set U and the downlink parameter group set D according to the platform type, the user station capability, the service type and the information rateuAnd a downlink parameter set pdDetermining coding, interleaving, modulation, spreading and symbol rate used in information transmission; wherein, U ═ { p ═ puI p for uplink, D ═ p { [ p ]dP for downlink, p is a set of transmission parameters, p ═ R (R)cod,Ncod,Dint,M,L,Rs)，RcodRepresenting the code rate, NcodIndicating the code length, DintIndicating the interleaving depth, M the modulation order, L the spreading ratio, RsRepresents a symbol rate;
step two: the user station loaded on different platforms packages the service type, the information rate and the transmission parameter into a service application message and sends the message to the satellite;
step three: after receiving the service application message, the satellite extracts the service type, the information rate and the transmission parameters in the message, allocates carriers and time slot resources in an uplink carrier group and time slot resources in a downlink carrier for the subscriber station according to the extracted information, and sends the allocation result to the subscriber station through the resource allocation message;
step four: receiving resource allocation information by user stations loaded on different platforms, and acquiring uplink carrier and time slot resources and downlink time slot resources of the station;
step five: the service information to be sent is carried by the subscriber station loaded on different platforms according to the uplink parameter group puProcessing the parameters and sending frequency hopping signals in the allocated uplink carrier and time slot; at the same time, the subscriber station receives the frequency hopping signal in the allocated downlink time slot and according to the downlink parameter set pdThe parameters in (3) process the received signal and recover the service information.
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| CN113258956B (en) * | 2021-06-22 | 2021-10-01 | 北京理工大学 | Satellite communication signal processing method, device, electronic equipment and medium |
| CN117896835B (en) * | 2024-03-14 | 2024-05-10 | 成都星联芯通科技有限公司 | Time slot resource scheduling method, device, earth station, communication system and storage medium |
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