CN116470954A - Communication broadband distribution method and system for remote sensing satellite constellation - Google Patents
Communication broadband distribution method and system for remote sensing satellite constellation Download PDFInfo
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- 238000003384 imaging method Methods 0.000 claims description 14
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
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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
- H04B7/18515—Transmission equipment in satellites or space-based relays
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a communication broadband distribution method for remote sensing satellite constellation, comprising the following steps: responding to a bandwidth configuration request; determining a target load working mode according to a task preset by a remote sensing constellation; acquiring and confirming a single target data quantity and a data generation period according to the target load working mode; tracking the current target, analyzing the data volume generated by the current target, configuring a corresponding link flow, and counting and outputting the data volume and the data rate of multi-star concurrent work; the method comprises the steps of determining the multi-satellite instantaneous data rate and the average flow according to the channel coding efficiency and the frame efficiency configured in a satellite communication link, and calculating to obtain satellite communication bandwidth, so that the data volume and time actually generated by a load are calculated, the total data rate of the load in an application period is determined, and flow parameters are analyzed, and further, the optimal allocation of the satellite communication bandwidth is realized.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a communication broadband distribution method and system for remote sensing satellite constellations.
Background
With the enhancement of satellite detection load capacity, the obtained data image can achieve higher spatial resolution, finer spectrum and wider picture, which are helpful for achieving more refined application. However, higher quality images mean greater satellite communication bandwidth is required. The present invention is limited by the existing frequency system of the ground data transmission station and the construction period of the new station, and the data volume required by the load full-state work cannot be completely satisfied at the present stage.
Disclosure of Invention
The invention aims to provide a communication bandwidth allocation method and a system for a remote sensing satellite constellation, which realize load data return under the condition of least occupied resources and provide a safe, reliable and economic data transmission channel.
The invention provides a communication broadband distribution method for a remote sensing satellite constellation, which comprises the following steps:
responding to a bandwidth configuration request;
determining a target load working mode according to a task preset by a remote sensing constellation;
acquiring and confirming a single target data quantity and a data generation period according to the target load working mode;
tracking the current target, analyzing the data volume generated by the current target, configuring a corresponding link flow, and counting and outputting the data volume and the data rate of multi-star concurrent work;
the method comprises the steps of determining the multi-satellite instantaneous data rate and the average flow according to the channel coding efficiency and the frame efficiency configured in a satellite communication link, and calculating to obtain satellite communication bandwidth, so that the data volume and time actually generated by a load are calculated, the total data rate of the load in an application period is determined, and flow parameters are analyzed, and further, the optimal allocation of the satellite communication bandwidth is realized.
Optimally, the target load working modes comprise a search finding mode, a load autonomous planning mode, a track tracking mode and an identification confirming mode, namely, the specified area is imaged through the optical load to form target search finding, the load is autonomously planned, the searched target is identified and confirmed, and in the searching process, generated target data and echo data are transmitted to the ground site to complete the search finding and identification confirming of the target of interest to form a series of target modes.
Optimally, the link flow comprises a first transmission link between constellations and a second transmission link between stars and grounds, and the paths of the first transmission link and the second transmission link are determined by constellation configuration and ground data station distribution.
Optimally, the satellite communication bandwidths comprise inter-satellite transmission bandwidths and satellite-to-ground transmission bandwidths, and each transmission bandwidth needs to be determined by combining a link flow and a data rate.
Optimally, the multi-star instantaneous data rate is the data rate of multi-star concurrence and gathered to a single star for transmission, and the average value of the multi-star instantaneous data rate is larger than the maximum data rate in any target load working mode.
Optimally, the steps of tracking the current target, analyzing the data volume generated by the current target, configuring a corresponding link flow, and counting and outputting the data volume and the data rate of the multi-star concurrency work include:
calculating the data volume of single star work:
analyzing the data amount generated by the search discovery mode:
according to the imaging mode 50m multiplied by 500m/200km multiplied by 200km, the data rate of target data generation is 2Gbps, the time is 3 s/time, 2 times are total, and the data amount is searched for 12Gb;
analyzing the data amount generated by identifying the confirmation pattern:
the imaging mode is 50m/40km multiplied by 40km, the data rate of target data generation is 0.5Gbps, the time is 4 s/time, 1 time is total, and the imaging data volume is 2Gb;
analyzing the target data volume:
the target data amount generated by single star single access is 1Mb, the data generation period is 20s, and the single star target data rate is 50kbps on average.
As an optimization, in the tasks preset by the remote sensing constellation, the data rate of the echo data generated in the search discovery mode=the data rate of the target data generated in the imaging mode is equal to the search discovery task data generation cycle time and interval time.
As an optimization, in the tasks preset by the remote sensing constellation, the data rate of the echo data generated in the recognition confirmation mode=the data rate of the target data generated in the imaging mode is the recognition confirmation task data generation cycle time is the interval time.
Optimally, the channel coding efficiency and frame efficiency are calculated as 80% of its own efficiency.
The invention provides a communication broadband distribution system for remote sensing satellite constellation, which comprises:
a response module for responding to the bandwidth configuration request;
the mode confirmation module is used for determining a target load working mode according to a task preset by the remote sensing constellation;
the data acquisition module is used for acquiring and confirming the single target data volume and the data generation period according to the target load working mode, tracking the current target, analyzing the data volume generated by the current target, configuring a corresponding link flow, and counting and outputting the data volume and the data rate of multi-star concurrent work;
the result output module is used for determining the multi-satellite instantaneous data rate and the average flow according to the channel coding efficiency and the frame efficiency configured in the satellite communication link, and calculating to obtain the satellite communication bandwidth, so as to calculate the data volume and time actually generated by the load, determine the total data rate of the load in an application period and analyze the flow parameters, and further realize the optimal allocation of the satellite communication bandwidth.
Aiming at the prior art, the invention has the following beneficial effects:
the invention starts from the aspect of throttling, and optimally distributes the whole communication bandwidth of the satellite constellation according to the service working mode of a single satellite and the concurrent data quantity of multiple satellites in the whole satellite constellation. According to the task planning condition of the remote sensing constellation, determining a specific application flow of the load, calculating the data volume and time actually generated by the load, determining the total data rate of the load in an application period, analyzing the peak flow and the average flow, and further optimally distributing the satellite communication bandwidth according to the total data rate and the average flow, so that precious frequency resources are saved.
Drawings
Fig. 1 is a flowchart illustrating an exemplary method for allocating communication bandwidth for a remote sensing satellite constellation according to an embodiment of the present invention;
fig. 2 is a graph of load steady-state detection tracking target application flow and total data rate analysis provided in an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The remote sensing satellite constellation related by the invention has the main task of imaging a designated area through an optical load, realizing the search and discovery of targets such as vehicles, ships, airplanes and the like, carrying out further autonomous planning on the load, identifying and confirming the searched targets, and downloading generated target data and echo data to a ground station in time in the process, so as to finish the search, discovery, identification and confirmation of the targets of interest. Therefore, the communication bandwidth setting of the remote sensing satellite constellation is required to be completed according to the application scene envelope, the load data return is realized in the state of least occupied resources, and a safe, reliable and economic data transmission channel is provided.
As shown in fig. 1 and 2, in one embodiment, the present invention provides a communication bandwidth allocation method for a remote sensing satellite constellation, including:
s1: responding to a bandwidth configuration request;
s2: determining a target load working mode according to a task preset by a remote sensing constellation; in this embodiment, the task preset by the remote sensing constellation adopts a load application process, where the load application process includes search discovery, autonomous load planning, track tracking, identification and confirmation, and the like. The respective duration of the load application processes such as load search discovery, load autonomous planning, track tracking, identification confirmation and the like are determined by the load field area, the spatial resolution, the performance of a satellite-borne computer and the like. The performance of the spaceborne computer determines the time required by autonomous load planning, and influences the total load application flow time and the data rate.
S3: acquiring and confirming a single target data quantity and a data generation period according to the target load working mode;
s4: tracking the current target, analyzing the data volume generated by the current target, configuring a corresponding link flow, and counting and outputting the data volume and the data rate of multi-star concurrent work; the link flow comprises transmission links between constellations and transmission links between the stars and the ground, and the specific path is determined by constellation configuration and ground data station distribution.
S5: the method comprises the steps of determining the multi-satellite instantaneous data rate and the average flow according to the channel coding efficiency and the frame efficiency configured in a satellite communication link, and calculating to obtain satellite communication bandwidth, so that the data volume and time actually generated by a load are calculated, the total data rate of the load in an application period is determined, and flow parameters are analyzed, and further, the optimal allocation of the satellite communication bandwidth is realized. Determining a multi-star instantaneous data rate by combining data format overhead and coding efficiency; the data format overhead and coding efficiency are determined by the actual link usage and can typically be calculated at 80%.
The satellite communication bandwidth is calculated by the following formula communication bandwidth = data line width x transmission line clock frequency x number of data transmissions per clock pulse/8. The satellite communication bandwidth comprises an inter-satellite transmission bandwidth and an inter-satellite transmission bandwidth, and the specific bandwidth needs to be determined by combining a link flow and a data rate. The link flow comprises transmission links between constellations and transmission links between the stars and the ground, and the specific path is determined by constellation configuration and ground data station distribution.
In one embodiment, the multi-star instantaneous data rate is a data rate of a single star concurrently combined and transmitted by a plurality of stars, and the average value of the data rate is larger than the maximum data rate in any of the target load working modes.
Taking an application flow of load steady state detection tracking targets as an example in the embodiment of the invention, according to analysis of single target tracking data volume, a link flow is given: assuming that 5 satellites are in the constellation, the distance between the satellites is 20000km, searching and finding are firstly carried out when a single satellite works, finding and classifying the targets are achieved, and then identification and confirmation are carried out on the classified targets by using a high-resolution urban and rural mode.
The data volume of single star work is calculated first.
Search discovery data volume analysis:
according to the imaging mode 50m×500m/200km×200km, the data rate 2Gbps, the time 3 s/time, 2 times total, searching the data amount 12Gb;
identification confirmation data amount analysis:
the imaging mode is 50m/40km multiplied by 40km,0.5Gbps, the time is 4 s/time, and the total time is 1 time, and the imaging data volume is 2Gb.
Target data size analysis:
the target data amount generated by single star single access is about 1Mb, the data generation period is 20s, and the single star target data rate is 50kbps on average.
And then calculating the data quantity of the multi-star concurrent work.
The original echo data quantity generated by single star single access is added up to about 14Gb, the target data quantity is ignored, redundancy coverage is carried out later, the data generation period is 20s, the average data rate is 0.7Gbps, and the 5 star concurrent echo data quantity is about 70Gb, so that the total echo data rate is 3.5Gbps.
And finally, calculating the actual satellite communication bandwidth.
For a 5-star ring network, only one star can be seen at the same time in the environment, and the star bears the task of data transmission and is responsible for transmitting data of the star and other satellite routes to the environment. Assuming that the inter-satellite link communication bandwidth is xGpbs, and the satellite-to-ground data transmission channel is yGps, wherein y is larger than x, so that the data can be completely transmitted back. Considering that the echo data volume generated by the satellite can be directly downloaded, 0.7Gbps is occupied, so that y-0.7Gbps is remained for forwarding the data paths of other satellites. Considering the inter-satellite transmission distance 20000km, the transmission delay is 0.7/x, the spatial propagation delay is 0.67s, and the total single-hop transmission delay is estimated to be 0.7/x+0.8s when the forwarding processing delay is added. At most two backhauls are needed to be transmitted into the environment under 5 star topology, so that the transmission delay is 2 (0.7/x+0.8) s. The satellite-to-ground data transmission delay is 0.7.4/(y-0.7) s, and the propagation delay is the track height divided by the speed of light and can be 1s. Engineering generally considers that the inter-satellite transmission delay and the satellite-ground transmission delay are less than 5 seconds to realize near real-time transmission. Thus there is
2·(0.7/x+0.8)+0.7*4/(y-0.7)+1＜5
And obtaining the engineering application requirements of the inter-satellite link bandwidth and the data transmission bandwidth according to the formula. Such as x=1, y=3.5; i.e. 1Gbps for inter-satellite link bandwidth and 3.5Gbps for data transmission channel bandwidth.
In addition, channel coding and frame format overhead need to be considered in satellite communication link usage. For a high-speed echo link, 7/8LDPC or 5/6LDPC channel coding is generally adopted, the coding efficiency is as high as 83%, echo data is mainly long frames, the frame header and check bit overhead is negligible, and the comprehensive frame efficiency can be estimated according to 80%. The inter-satellite link bandwidth can be set to 1.25Gbps and the data transmission channel bandwidth 4.4Gbps.
According to the technical scheme provided by the embodiment of the disclosure, the method for distributing the satellite communication bandwidth based on the load application flow is provided, the data volume and time actually generated by the load are accurately calculated based on the specific application mode of the detected load, the total data rate of the load in one application period is calculated, and therefore the satellite communication bandwidth is accurately distributed, and precious frequency resources are saved.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A communication broadband distribution method for a remote sensing satellite constellation, comprising:
responding to a bandwidth configuration request;
determining a target load working mode according to a task preset by a remote sensing constellation;
acquiring and confirming a single target data quantity and a data generation period according to the target load working mode;
tracking the current target, analyzing the data volume generated by the current target, configuring a corresponding link flow, and counting and outputting the data volume and the data rate of multi-star concurrent work;
the method comprises the steps of determining the multi-satellite instantaneous data rate and the average flow according to the channel coding efficiency and the frame efficiency configured in a satellite communication link, and calculating to obtain satellite communication bandwidth, so that the data volume and time actually generated by a load are calculated, the total data rate of the load in an application period is determined, and flow parameters are analyzed, and further, the optimal allocation of the satellite communication bandwidth is realized.
2. The communication broadband distribution method for remote sensing satellite constellation according to claim 1, wherein the target load working modes include a search discovery mode, a load autonomous planning mode, a track tracking mode and an identification confirmation mode, namely, a designated area is imaged through an optical load to form a target search discovery, the load is autonomously planned, the searched target is identified and confirmed, and in the searching process, generated target data and echo data are downloaded to a ground site to complete the search discovery and identification confirmation of the target of interest to form a series of target modes.
3. The communication broadband distribution method for remote sensing satellite constellation according to claim 1, wherein said link procedure includes a first transmission link between constellations and a second transmission link between stars and the paths of said first transmission link and said second transmission link are determined by constellation configuration and ground data station distribution.
4. The communication broadband distribution method for remote sensing satellite constellation according to claim 1, wherein said satellite communication bandwidths include inter-satellite transmission bandwidths and satellite-to-ground transmission bandwidths, each transmission bandwidth being determined in combination with a link flow and a data rate.
5. The communication broadband distribution method for remote sensing satellite constellation according to claim 1, wherein said multi-star instantaneous data rate is a data rate of multi-star concurrent and aggregated to a single star for transmission, with an average value greater than a maximum data rate in any of said target loading modes of operation.
6. The communication broadband distribution method for remote sensing satellite constellation according to claim 1, wherein said tracking the current target and analyzing the data amount generated by the current target, and configuring the corresponding link flow, and statistically outputting the data amount and the data rate of the multi-satellite concurrency operation comprises:
calculating the data volume of single star work:
analyzing the data amount generated by the search discovery mode:
according to the imaging mode 50m multiplied by 500m/200km multiplied by 200km, the data rate of target data generation is 2Gbps, the time is 3 s/time, 2 times are total, and the data amount is searched for 12Gb;
analyzing the data amount generated by identifying the confirmation pattern:
the imaging mode is 50m/40km multiplied by 40km, the data rate of target data generation is 0.5Gbps, the time is 4 s/time, 1 time is total, and the imaging data volume is 2Gb;
analyzing the target data volume:
the target data amount generated by single star single access is 1Mb, the data generation period is 20s, and the single star target data rate is 50kbps on average.
7. The communication broadband distribution method for remote sensing satellite constellation according to claim 2, wherein in the tasks preset by the remote sensing constellation, the data rate of echo data generated in the search discovery mode=the data rate of target data generated in the imaging mode is the search discovery task data generation cycle time is the interval time.
8. The communication broadband distribution method for remote sensing satellite constellation according to claim 2, wherein in the tasks preset by the remote sensing constellation, the data rate of echo data generated in the recognition confirmation mode=the data rate of target data generated in the imaging mode is the recognition confirmation task data generation cycle time is the interval time.
9. The communication broadband distribution method for remote sensing satellite constellation according to claim 1 wherein said channel coding efficiency and frame efficiency are calculated as 80% of its own efficiency.
10. A communication broadband distribution system for a constellation of remote sensing satellites, comprising:
a response module for responding to the bandwidth configuration request;
the mode confirmation module is used for determining a target load working mode according to a task preset by the remote sensing constellation;
the data acquisition module is used for acquiring and confirming the single target data volume and the data generation period according to the target load working mode, tracking the current target, analyzing the data volume generated by the current target, configuring a corresponding link flow, and counting and outputting the data volume and the data rate of multi-star concurrent work;
the result output module is used for determining the multi-satellite instantaneous data rate and the average flow according to the channel coding efficiency and the frame efficiency configured in the satellite communication link, and calculating to obtain the satellite communication bandwidth, so as to calculate the data volume and time actually generated by the load, determine the total data rate of the load in an application period and analyze the flow parameters, and further realize the optimal allocation of the satellite communication bandwidth.
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| CN117459125A (en) * | 2023-11-17 | 2024-01-26 | 南京佳格耕耘科技有限公司 | Satellite remote sensing data access system |
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| CN117459125A (en) * | 2023-11-17 | 2024-01-26 | 南京佳格耕耘科技有限公司 | Satellite remote sensing data access system |
| CN117459125B (en) * | 2023-11-17 | 2024-06-04 | 南京佳格耕耘科技有限公司 | Satellite remote sensing data access system |
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