CN106921523A - A kind of data transmission method based on GEO/LEO satellite networks - Google Patents
A kind of data transmission method based on GEO/LEO satellite networks Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/14—Network analysis or design
- H04L41/145—Network analysis or design involving simulating, designing, planning or modelling of a network
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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
- H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
- H04B7/18584—Arrangements for data networking, i.e. for data packet routing, for congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/12—Discovery or management of network topologies
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0829—Packet loss
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/026—Details of "hello" or keep-alive messages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/02—Topology update or discovery
- H04L45/04—Interdomain routing, e.g. hierarchical routing
Abstract
The invention belongs to technical field of data transmission, a kind of data transmission method based on GEO/LEO satellite networks is disclosed, including：GEO satellite is regularly sent out hello packets, and the id and other fields of GEO satellite node are included in packet；After LEO receives the hello packets of GEO transmissions, time delay value of the packet in transmitting procedure is calculated；When LEO satellite node does not have GEO to access satellite node, then data relay transmission is carried out by same orbiter node；When GEO satellite node receives the packet that LEO satellite is transmitted, the access satellite field in the packet that LEO satellite node sends is judged；Whether the id for judging this satellite node is 3 or 4 nodes；Earth station receives the data of GEO transmission and is processed accordingly.The present invention realizes the real-time Transmission to producing data in LEO satellite, realizes the real-time update to accessing satellite and detection.
Description
Technical field
The invention belongs to technical field of data transmission, more particularly to a kind of data transfer based on GEO/LEO satellite networks
Method.
Background technology
With the development of space technology, Aerospace Satellite technology has also obtained quick development in national defence and civil area.Defend
StarNet's network is widely used at aspects such as geophysical surveying, weather warning, natural calamity rescue and communications.With ground network phase
Than satellite network is not limited by geographical environments such as high mountain, river and buildings, can realize data in wide scope
Transmission.When inter-satellite is communicated, the transmission medium of data can be considered vacuum, influence of the transmission environment to data transfer compared with
Small, while distant between spatial network interior joint, influence of the propagation delay time to data transfer is more notable.In Aerospace Satellite
In network, LEO satellite is nearer away from ground, and around ground, cycle period is shorter, can be good at carrying out the geographical, collection of weather information.
Meanwhile, the cycle period of LEO satellite is short, fast translational speed and also result in the features such as small area coverage and earthward send data
Time it is very short, usual only a few minutes, therefore LEO satellite is difficult for the data of collection to be transmitted to ground in a short time.The earth
Geosynchronous satellite has good performance at aspects such as data transfer, overlay areas, it is only necessary to which three satellites can be to the earth
Middle lower latitude realizes covering, by geo-synchronous orbit satellite and the joint communication of LEO satellite network, using suitable wireless
Data collected by LEO satellite network can be carried out real-time Transmission by repetition policy.When satellite network is used to communicate, communication
Information there is diversity, have different demands to transmission link situation.In satellite network, the topologies change of network
Than very fast, using the path chosen based on static topology routing algorithm, take a broad view when in the overall situation, be then not necessarily optimal
Path.A kind of DTN routing algorithms based on GEO junction networks, the algorithm by the real-time update that is route to next-hop, and according to
It is expected delivery time and estimated delivery cost to obtain the optimal path of transmission.Proposed in GEO/LEO double layer minipellets
A kind of routing algorithm of data-driven, the routing algorithm is passed by the method that flow transmits balanced and region division to data
It is defeated, the route of this track is managed by orbital head node in the algorithm.However, due to the mobility of satellite so that rail
Trace header node cannot be constantly in the coverage of GEO satellite node.With reference to LEO satellite real-time Transmission information advantage with
The advantage of the stronger computing capability of GEO satellite, it is proposed that SARA (autonomous routing algorithm) algorithm.Using the company of ISL (inter-satellite link)
General character rule route to divide network topology and calculate.Algorithm has autonomy, with more preferable survivability, it is possible to reduce information
Load, increases the correct transfer rate of packet, improves the ability of network processes malfunctioning node.It is a kind of dynamic based on volume forecasting
State routing algorithm-TPDR algorithms, the algorithm has two-level architecture, including LEO layers and GEO layers, and TPDR algorithms support new node
Network is added, while the prediction based on flow prevents management node excess load.Mainly solve 2 problems：Treatment dynamic access is new
Node problems, solution management node loading problem.TPDR algorithms can be supported in new node addition network, it is ensured that high real-time
Property and data integrity, it is possible to reduce time delay end to end, it is possible to reduce packet loss.
In sum, the problem of prior art presence is：The transmission time of LEO satellite network data is short.
The content of the invention
For the problem that prior art is present, the invention provides a kind of data transfer based on GEO/LEO satellite networks
Method.
The present invention is achieved in that a kind of data transmission method based on GEO/LEO satellite networks, described based on GEO/
The data transmission method of LEO satellite network is comprised the following steps：
Step one, GEO satellite is regularly sent out hello packets, and the id of GEO satellite node is included in packet
And other fields；
Step 2, after LEO receives the hello packets of GEO transmissions, calculates time delay of the packet in transmitting procedure
Value, if LEO receives multiple hello packets, more different GEO satellite nodes send the propagation delay time of packet, during transmission
Prolong small, then show that GEO satellite nodal point separation LEO satellite node is nearer；Propagation delay time is big, then show GEO satellite nodal point separation LEO satellite
Node is farther out；
Step 3, when LEO satellite node does not have GEO to access satellite node, then enters line number by same orbiter node
According to relay transmission；With the transmission range of hop count statistics in transmittance process；
Step 4, when GEO satellite node receives the packet that LEO satellite is transmitted, judges what LEO satellite node sent
Access satellite field in packet：Whether acc_geo is this satellite node, if it is not, then deleting packet；If so, entering
Enter step 5；
Step 5, whether the id for judging this satellite node is 3 or 4 nodes, if id_self=3 or 4, by packet to
Ground forwarding, if id_self=1, packet is transmitted to 4 nodes, if id_self=2, data is transmitted into 3 nodes；
Step 6, earth station receives the data of GEO transmission and is processed accordingly.
Further, the computing formula of propagation delay time is shown below in the step 2：
Di=Ttemp-Tcreat(pkt) (1)
DiThe propagation delay time of GEO satellite node data bag is received for LEO satellite node, the id of GEO satellite node is i, Ttemp
It is current simulation time, Tcreat(pkt)It is the creation time of packet.
Minimum transfer time delay DminAcquisition it is as follows：
Dmin=min { Di,Dj,......} (2)
D is the access node that the GEO satellite node for selecting propagation delay time minimum is transmitted as LEO satellite node data.
Further, there is hop count field num_hop in the packet of transmission in the step 3, when packet is saved from source
When point sends, num_hop=0, packet judges whether the LEO satellite node has GEO to access and defend often by a LEO node
Star, if there is GEO to access satellite, GEO satellite node is sent to by packet, such as accesses satellite without GEO, and num_hop adds 1, after
Continue and relayed to same orbiter node.As num_hop=3, do not carry out data transmission to GEO satellite node still,
Then by data packet discarding.
Used another object of the present invention is to provide a kind of data transmission method based on GEO/LEO satellite networks
Network topology model, the network topology model be GEO/LEO double layer minipellet models；Entered by GEO satellite Internet
Row real-time Transmission, transfers data to earth station；In network topology model, LEO satellite quantity is 11*2, low using two
Rail satellite orbit, the number of satellites on every satellite orbit is 11, and GEO satellite then uses geo-synchronous orbit satellite, quantity
It is 4.
Used another object of the present invention is to provide a kind of data transmission method based on GEO/LEO satellite networks
Business mode, the business mode simulates three kinds of business using tri- kinds of data transmission rates of low, mid, high
Type.
Used another object of the present invention is to provide a kind of data transmission method based on GEO/LEO satellite networks
Routing mechanism, the routing mechanism is by the way of fixed route.
Another object of the present invention is to provide the data transmission method based on GEO/LEO satellite networks described in a kind of application
Telecommunication satellite.
Advantages of the present invention and good effect are：Propose a kind of based on GEO/LEO double layer minipellet models.By the earth
Synchronous satellite realizes the real-time Transmission to producing data in LEO satellite as the repeater satellite of data transfer, and for multilayer
The data transfer of satellite network, devises a kind of routing mechanism, in the routing mechanism, it is contemplated that the dynamic topology of satellite network
Change, realizes the real-time update to accessing satellite and detection.Network model to proposing is emulated, and demonstrates network mould
Reliability of the type in data transfer, and multi-service mode is emulated.For satellite network it is vulnerable the characteristics of, with
As a example by common saturation attack, situation about being attacked important traffic node in satellite network is simulated, difference can be obtained
The assessment that node influences on network performance.It is of the invention then be based on GEO/LEO double layer minipellets, by being updated periodically LEO's
GEO satellite is accessed to ensure the real-time Transmission of data.
Brief description of the drawings
Fig. 1 is the data transmission method flow chart based on GEO/LEO satellite networks provided in an embodiment of the present invention.
Fig. 2 is the transmission selection schematic diagram of LEO satellite data provided in an embodiment of the present invention.
Fig. 3 is the data transfer schematic diagram in GEO satellite layer provided in an embodiment of the present invention.
Fig. 4 is two distinct types of data production rate schematic diagram provided in an embodiment of the present invention；
In figure：A () uniformly produces speed；The generation speed of (b) Poisson distribution.
Fig. 5 is the packet throughput schematic diagram in satellite network model provided in an embodiment of the present invention.
Fig. 6 is the packet loss schematic diagram in satellite network provided in an embodiment of the present invention.
Fig. 7 is the propagation delay time schematic diagram of satellite network provided in an embodiment of the present invention.
Fig. 8 is the delay variation schematic diagram in data transmission procedure provided in an embodiment of the present invention.
Fig. 9 is that ground node provided in an embodiment of the present invention receives data volume change schematic diagram.
Figure 10 is the change schematic diagram of propagation delay time provided in an embodiment of the present invention.
Figure 11 is packet loss change schematic diagram provided in an embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Application principle of the invention is explained in detail below in conjunction with the accompanying drawings.
As shown in figure 1, the data transmission method based on GEO/LEO satellite networks provided in an embodiment of the present invention is including following
Step：
S101：GEO satellite is regularly sent out hello packets, include in packet the id of GEO satellite node with
And other fields；
S102：After LEO receives the hello packets of GEO transmissions, time delay of the packet in transmitting procedure is calculated
Value, if LEO receives multiple hello packets, more different GEO satellite nodes send the propagation delay time of packet, during transmission
Prolong small, then show that GEO satellite nodal point separation LEO satellite node is nearer；Propagation delay time is big, then show GEO satellite nodal point separation LEO satellite
Node is farther out；
S103：When LEO satellite node does not have GEO to access satellite node, then data are carried out by same orbiter node
Relay transmission；With the transmission range of hop count statistics in transmittance process；
S104：When GEO satellite node receives the packet that LEO satellite is transmitted, the number that LEO satellite node sends is judged
According to the access satellite field in bag：Whether acc_geo is this satellite node, if it is not, then deleting packet；If so, into
Step S105；
S105：Whether the id for judging this satellite node is 3 or 4 nodes, if id_self=3 or 4, by packet to ground
Face forwards, if id_self=1, packet is transmitted to 4 nodes, if id_self=2, data is transmitted into 3 nodes；
S106：Earth station receives the data of GEO transmission and is processed accordingly.
Application principle of the invention is further described below in conjunction with the accompanying drawings：
1 network model
1.1 network topology models
GEO/LEO double layer minipellet models are used in our current research, and the meaning that model is set up is：LEO collects corresponding
Ground data, real-time Transmission is carried out by GEO satellite Internet, transfers data to domestic earth station of China.Opened up in network
Flutter in model, LEO satellite quantity is 11*2, and using two low orbit satellite tracks, the number of satellites on every satellite orbit is
11, GEO satellite then uses geo-synchronous orbit satellite, and quantity is 4.
1.2 business modes
In real satellite network system, satellite network transmission type of service be it is diversified, such as：Message, text,
Sound, image and video etc..Service quality required by the data transfer of different service types is then very different, text
This, reliability of the message then to transmitting have requirement very high, the real-time to transmitting is then less demanding, sound, video then logarithm
Requirement of real-time according to transmission is very high.In addition, the data volume of different kinds of business is also differed.
In satellite network model, three kinds of types of service are simulated using tri- kinds of data transmission rates of low, mid, high,
And then to reflect system to three kinds of disposal abilities of type of service.The generation speed of data is divided into satellite network in addition
Even type with meet Poisson distribution type, when homogenous type is used for simulating LEO satellite for Data Collection, in normal environment
Under, the data volume produced in each fixed time period；Poisson distribution type then produces data volume to exist for simulating LEO satellite node
Have in the case of fluctuating, the packet amount produced in each fixed time period.
The generation speed of three kinds of business is as shown in table 1：
The data traffic types of table 1
Routing mechanism in 1.3 satellite networks
(1) the transmission selection of satellite
In the satellite network model of design, LEO satellite network is then mainly responsible for the collection of information data and is sent, LEO
The collection process of data is then simulated with the generation of data.After LEO satellite node produces data, then there are two kinds of transmission choosings
Select, when there is access GEO satellite, be transmitted to GEO satellite node；There is no GEO to access satellite, then passed to LEO satellite
It is defeated.As shown in Figure 2.
GEO layers of satellite network number of satellite is comparatively limited, therefore satellite network is reduced by the way of fixed route
Transport overhead.Fixed transmitting procedure is as shown in Figure 3.
As shown in figure 3, the position in GEO satellite network has determined.In satellite network route situation as shown in figure 1,
The data of GEO1 carry out relay transmission by GEO4, and the data of GEO2 carry out relay transmission by GEO4, then by GEO3 and GEO4
Hairnet network earth station.
(2) data transmission method
Step1:GEO satellite is regularly sent out hello packets, and the id of GEO satellite node is included in packet
And other fields.
Step2:After LEO receives the hello packets of GEO transmissions, time delay of the packet in transmitting procedure is calculated
Value, if LEO receives multiple hello packets, more different GEO satellite nodes send the propagation delay time of packet, during transmission
Prolong small, then show that GEO satellite nodal point separation LEO satellite node is nearer；Propagation delay time is big, then show GEO satellite nodal point separation LEO satellite
Node is farther out.The computing formula of propagation delay time is as follows：
Di=Ttemp-Tcreat(pkt) (1)
DiThe propagation delay time of GEO satellite node data bag is received for LEO satellite node, the id of GEO satellite node is i, Ttemp
It is current simulation time, Tcreat(pkt)It is the creation time of packet.
Minimum transfer time delay DminAcquisition it is as follows：
Dmin=min { Di,Dj,……} (2)
D is the access node that the GEO satellite node for selecting propagation delay time minimum is transmitted as LEO satellite node data.
Step3:When LEO satellite node does not have GEO to access satellite node, then data are carried out by same orbiter node
Relay transmission.With the transmission range of hop count statistics in transmittance process.In the packet of transmission, there is hop count field num_
Hop, when packet sends from source node, num_hop=0, packet judges the LEO satellite section often by a LEO node
Whether point has GEO to access satellite, if there is GEO to access satellite, packet is sent into GEO satellite node, and such as no GEO is accessed and defended
Star, num_hop adds 1, continues to be relayed to same orbiter node.As num_hop=3, still not to GEO satellite section
Point carries out data transmission, then by data packet discarding.
Step4:When GEO satellite node receives the packet that LEO satellite is transmitted.First, it is determined that LEO satellite node sends
Access satellite field in the packet for coming：Whether acc_geo is this satellite node, if it is not, then deleting packet；If
It is, into step 5.
Step5:Whether the id for judging this satellite node is 3 or 4 nodes, if id_self=3 or 4, by packet to ground
Face forwards, if id_self=1, packet is transmitted to 4 nodes, if id_self=2, data is transmitted into 3 nodes.
Step6:Earth station receives the data of GEO transmission and is processed accordingly.
By above step, data transfer that will be collected in LEO satellite to earth station is realized.Yet with satellite node
Mobility cause the access GEO satellite of LEO satellite often to change.Therefore it is periodically required to carry out network topology structure more
Newly.Concrete condition is：GEO satellite is periodically required to be sent out hello packets, is updated every same time in LEO satellite
Once corresponding GEO accesses satellite.
Application effect of the invention is described in detail with performance evaluation with reference to emulation.
1 emulation and performance evaluation
1.1 network performance evaluation indexs
The GEO/LEO double-layer network models for using in our current research, are mainly used in carrying out the collection and transmission of data, in net
The performance that satellite network is evaluated in network model main is estimated from handling capacity, time delay, network delay shake and packet loss.Net
Network performance indications are defined as follows：
(1) data throughput
In the network model used in present networks, packet throughput is mainly used to weigh satellite network transmittability.
Network bag throughput is then the ratio of network always reception amount and network traffic volume, i.e. σ=OUT/IN.Wherein OUT is received for network
Amount, is the number-of-packet that destination node is reached in the unit interval, and unit is packet/s (bag/second).Network traffic volume is unit
Source node sends the summation IN, unit packet/s of packet in time.For whole or local steady state network, its input and
Output speed is equal.
(2) end-to-end time delay
The network delay for using in this study is that time delay, i.e. packet are produced in purpose from source node end to end
Node is received.Shown in the calculating of time delay such as formula (1).The time delay for counting in simulations is then the number that each data collecting point is received
According to being average that packet One Way Delay is received within the past period, and the time delay for being dropped packet is not accounted for
It is interior, because packet loss means that time delay is infinite.
(3) delay variation
When packet is transmitted in the entire network, the situation of change of time delay.Delay variation herein is by end-to-end
Time-delay calculation gained, at a time TiTime delay average Di, subsequent time Ti+1Time delay average Di+1For delay variation is
(Di+1-Di)/(Ti+1-Ti)。
(4) packet loss
Packet is produced in source node, is transmitted by satellite network, reaches the number of data packets of destination node.Packet loss
Rate represents that natural R is lower to mean that its packet loss is fewer with R, and wherein z is lost data packets number, and w is generation packet sum：
R=z/w
1.2 network attacks
Aerospace Satellite network is disclosed relatively due to position, therefore, easily it is subject to outside interference and malicious attack.In design
Satellite network model in, LEO satellite network major function is the collection of data, therefore the satellite node in LEO layers
It is under attack and fail it is little to the performance impact of whole network.GEO satellite network is passed as data in whole network model
Defeated backbone network, the performance of GEO satellite node is relatively large to the performance impact of whole network.It is right during emulation
The attack of satellite node focuses primarily upon GEO satellite node.
The index of network attack is then saturation attack.The function of saturation attack, is aimed at for satellite node, it is desirable to logical
The resource for taking satellite node is attacked in supersaturation, is that satellite node is in inoperable state.By the way that packet will be sent
Carrying out replicate, the channel of satellite node is taken by such method.Increase the handling capacity of satellite node, but data
Bag is essentially invalid packets.By the saturation attack intensity (1/10/100/1000) for setting, the data for creating satellite node
Coating duplication 1 (10/100/1000) is individual, and all of packet is sent into corresponding node.Saturation intensity is bigger, number of data packets
It is bigger, can more take the resource of satellite node.
1.3 experiment simulations
1.3.1 the double-layer satellite constellation model of 22LEO+4GEO
Building for 22LEO+4GEO double layer minipellet constellations, the constellation design parameter such as institute of table 2 are completed in STK softwares
Show, wherein 22 LEO satellites are distributed in two tracks, two satellites are uniformly distributed on each track.In addition each is set
LEO satellite all can as the source node of the transmission of packet, earth station as packet destination node, GEO satellite mainly uses
In data package transfer.
The satellite constellation parameter of table 2
Wherein, the fixed position of GEO satellite is：120°W、0°、100°E、140°E.
1.3.2 OPNET emulation and interpretation of result
The operation for carrying out satellite network using STK simulation softwares in the design of network model is simulated, and is generated corresponding
Trajectory files, the satellite node trajectory files imported in OPNET, set up whole satellite network model, imitative using OPNET networks
True instrument simulates the internal data processing procedure of satellite node.The set of time for carrying out network simulation using OPNET is 5min,
The time interval that GEO satellite node is sent out hello packets is 61s.
(1) data are equally distributed produces speed and the generation speed for meeting Poisson distribution
By the contrast of data production rate in above-mentioned Fig. 4, two distinct types of data production rate can be obtained all
Stablize relatively, illustrate that the satellite network model of design is capable of the analog functuion of complete paired data collection.To simplify statistical simulation,
In follow-up experiment statisticses by taking being uniformly distributed of data as an example.
(2) it is uniform to produce satellite network performance indications under speed
In a model, when throughput statistics is carried out to network, sum as data is activation is produced using LEO layers of satellite data
The data that amount, wherein each LEO satellite are produced are TCi, packet send total amount beNumber in satellite network
According to the data volume received by bag reception amount using ground node 11 as statistical value.Throughput in network is as shown in Figure 5.
Packet reception amount and the ratio of total traffic volume are relatively, almost 1 in Fig. 5, the data that this explanation LEO sends
Bag eventually arrives at ground node.The throughput decline that each will exist for a period of time in figure is then the GEO due to LEO satellite
Accessing satellite and regularly updating causes.When its access GEO satellite of the renewal of LEO, then cannot be gone up in the whole satellite network short time
Pass data so that the data receiving amount of satellite network destination node is less.
The overall packet loss that satellite network carries out data transmission as can see from Figure 6 is relatively low, is only carried out in LEO
Bursts dropping ratio can become very high when GEO accesses satellite update.The time delay and delay variation of Fig. 7, Fig. 8 display satellite network exist
General performance is comparatively stablized in satellite network, carries out to be had a greater change when GEO accesses satellite update in LEO.
(3) change of satellite network performance when under attack
In the satellite network model of design, GEO satellite network is responsible for main communication task, in GEO satellite network
Data transfer it is as shown in Figure 3.As illustrated, the difference according to GEO satellite network Satellite nodal function can be by node point
It is two types, a kind of node type is fringe node, is mainly used in the Data Collection of LEO satellite, such as node 1,2, satellite section
After point is by Data Collection, same layer satellite node is transmitted to；Another node type is core node, and function has LEO satellite data
Collect, the relaying of data and the transmission of data over the ground, such as node 3,4 are transmitted with layer satellite node.
For accurately obtain different types of GEO satellite node it is under attack when, network Satellite net neutral can decline
Situation.GEO1 and GEO3 are attacked respectively, influence of the analysis different type node failure to network.Due in saturation attack
In the case of the data volume transmitted in satellite network have large change, at this moment at this moment throughput will grind more than 1 to it in network
Study carefully and be not worth.In the case that saturation attack intensity is 10, satellite network performance indications are mainly to the packet of ground node
Receiving amount, packet loss and Delay Variation are compared.Shown in below figure 9, Figure 10, Figure 11.
As shown in figure 9, when satellite node be subject to saturation attack when, in satellite network packet traffic volume then have one compared with
Big raising, when GEO3 is under attack, the packet amount transmitted in network is bigger when more under attack than GEO1.When under attack
When, the propagation delay time of GEO1 is more or less the same with normal circumstances, and the propagation delay time of GEO3 has a certain degree of reduction, this be due to
When the satellite network of GEO3 is subject to saturation attack, saturation attack produces packet to be transferred to ground node and reduces propagation delay time
Average value.As shown in figure 11, the packet loss of satellite network can all increase, and increase amplitude is more or less the same, and this expression is attacked by saturation
When hitting, the correct packet amount for receiving can all be a greater impact.
Presently preferred embodiments of the present invention is the foregoing is only, is not intended to limit the invention, it is all in essence of the invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of data transmission method based on GEO/LEO satellite networks is comprised the following steps：
Step one, GEO satellite is regularly sent out hello packets, include in packet GEO satellite node id and
Other fields；
Step 2, after LEO receives the hello packets of GEO transmissions, calculates time delay value of the packet in transmitting procedure,
If LEO receives multiple hello packets, more different GEO satellite nodes send the propagation delay time of packet, propagation delay time
It is small, then show that GEO satellite nodal point separation LEO satellite node is nearer；Propagation delay time is big, then show GEO satellite nodal point separation LEO satellite section
Point is farther out；
Step 3, when LEO satellite node does not have GEO to access satellite node, then in carrying out data by same orbiter node
After transmission；With the transmission range of hop count statistics in transmittance process；
Step 4, when GEO satellite node receives the packet that LEO satellite is transmitted, judges the data that LEO satellite node sends
Access satellite field in bag：Whether acc_geo is this satellite node, if it is not, then deleting packet；If so, into step
Rapid five；
Step 5, whether the id for judging this satellite node is 3 or 4 nodes, if id_self=3 or 4, by packet earthward
Forwarding, if id_self=1, packet is transmitted to 4 nodes, if id_self=2, data is transmitted into 3 nodes；
Step 6, earth station receives the data of GEO transmission and is processed accordingly.
2. the data transmission method of GEO/LEO satellite networks is based on as claimed in claim 1, it is characterised in that the step
The computing formula of propagation delay time is shown below in two：
Di=Ttemp-Tcreat(pkt) (1)
DiThe propagation delay time of GEO satellite node data bag is received for LEO satellite node, the id of GEO satellite node is i, TtempIt is to work as
Preceding simulation time, Tcreat(pkt)It is the creation time of packet；
Minimum transfer time delay DminAcquisition it is as follows：
Dmin=min { Di,Dj,......} (2)
D is the access node that the GEO satellite node for selecting propagation delay time minimum is transmitted as LEO satellite node data.
3. the data transmission method of GEO/LEO satellite networks is based on as claimed in claim 1, it is characterised in that the step
In three in the packet of transmission, there is hop count field num_hop, when packet sends from source node, num_hop=0, data
Bag judges whether the LEO satellite node has GEO to access satellite often by a LEO node, if there is GEO to access satellite, by number
GEO satellite node is sent to according to bag, such as satellite is accessed without GEO, num_hop adds 1, in continuing to be carried out to same orbiter node
After；As num_hop=3, if not carrying out data transmission to GEO satellite node still, by data packet discarding.
4. the network topology model that a kind of data transmission method for being based on GEO/LEO satellite networks as claimed in claim 1 is used,
Characterized in that, the network topology model is GEO/LEO double layer minipellet models；Reality is carried out by GEO satellite Internet
When transmit, transfer data to earth station；In network topology model, LEO satellite quantity is 11*2, is defended using two low rails
Star orbital road, the number of satellites on every satellite orbit is 11, and GEO satellite then uses geo-synchronous orbit satellite, and quantity is 4
.
5. the business mode that a kind of data transmission method for being based on GEO/LEO satellite networks as claimed in claim 1 is used,
Characterized in that, the business mode simulates three kinds of types of service using tri- kinds of data transmission rates of low, mid, high.
6. the routing mechanism that a kind of data transmission method for being based on GEO/LEO satellite networks as claimed in claim 1 is used, it is special
Levy and be, the routing mechanism is by the way of fixed route.
7. the communication of the data transmission method based on GEO/LEO satellite networks described in a kind of application claims 1 to 3 any one
Satellite.
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