CN101404547B - Satellite network simulation system - Google Patents
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Abstract
The invention discloses a satellite network simulation system and belongs to the technical field of satellite communication simulation. The system comprises a main control computer, a real-time satellite channel simulator and a plurality of service simulation node computers; the main control computer is provided with a satellite network simulation software system which can achieve establishment of a satellite network simulation scene, can select a routing algorithm, set link parameters and achieve the information management of the simulation satellite network, and is connected with the real-time satellite channel simulator by an RS232 bus; the service simulation node is provided with a service simulation software which achieves simulation of a transmission process of the satellite network service, and is connected with the real-time satellite channel simulator by an Ethernet port. The satellite network simulation system can truly and comprehensively simulate topological changes of the satellite network, channel characteristics of an inter-satellite link and a satellite-to-earth link, and the transmission process of the satellite network service under the laboratory condition.
Description
Technical field:
The present invention relates to a kind of satellite network simulation system; The system of the professional transmission course of the time-delay of especially a kind of connectedness at data link layer analog satellite network, interspace, satellite-ground link channel and the error rate and satellite network belongs to the satellite communication simulation technical field.
Background technology:
Satellite network is a system that is made up of polytype satellite on the different tracks, according to the maximum effectively comprehensive utilization principle of space information resource, the intelligent system of intercommunication interconnection, organic formation.
Along with the Internet extensive use in the world and the development of satellite technology; Satellite network is applied to every field such as military affairs, meteorology, space flight, disaster early warning, agricultural, television relay gradually, becomes a foundation of the communication network of information exchange of future generation.But satellite network have topologies change rapidly, between star and characteristics such as the satellite-ground link transmission delay is big, link error rates is high, disposal ability is limited on the star; Add because the characteristic that the satellite network that region and time zone difference, constellation running and earth rotation cause carries the data traffic skewness; Make it both be different from torus network traditionally, be different from the terrestrial wireless communication network again.To this characteristics of satellite network, be necessary its performance is assessed, thereby reference be provided for satellite network design.
Satellite network Performance Evaluation satellite capable of using or aircraft are surveyed, but this mode wastes time and energy, and particularly in the early-stage Study of predevelopment phase, it is infeasible carrying test.In some cases; Because the restriction of condition; Carry out spaceborne or air-borne test, also can have the problem on technology and the funds, therefore adopt simulation means to simulate very necessary satellite network change in topology, channel parameter and professional transmission course interspace, satellite-ground link.
At present, mainly contain modes such as software modeling emulation, channel simulator, wherein the mode flexible configuration of software modeling emulation to the emulation of the characteristic of satellite network both at home and abroad; Easy to operate; But, be difficult to realize real-time, and can't realize the actual physical interface because amount of calculation is huge; Channel simulator can be in the laboratory through controlled, accurately, the characteristic of channel of mode real simulation satellite network repeatably, be a kind of mode preferably of satellite network being carried out emulation.External existing minority major company releases commercialization satellite channel simulator product; Some related works have been done by domestic also some scientific research institution; Satellite is interspace, the emulation of the star ground characteristic of channel but current satellite channel simulator product lays particular emphasis on mostly; This performance for the whole satellite network of assessment is still comprehensive inadequately, also lacks the emulation of the characteristics such as change in topology, route, professional transmission course of satellite network.
Summary of the invention:
The present invention is through making up a ground demonstration and a checking analogue system near the real satellite network environment; Realized that the change in topology to satellite network, channel parameter and professional transmission course interspace, satellite-ground link simulate reliably, solved comprehensively, the problem of real simulation satellite network characteristic.
Concrete technical scheme of the present invention is following:
A kind of satellite network simulation system comprises a main control computer, a real-time satellite channel simulator and some business simulating node computers; Operation has system of satellite network simulation software on the said main control computer, can realize setting up the satellite network simulating scenes, selects routing algorithm, link parameter is set, and management emulation satellite network information is connected with the real-time satellite channel simulator through the RS232 bus; Operation has business simulating software on the said business simulating node, realizes the simulation of the professional transmission course of satellite network is connected with the real-time satellite channel simulator through ethernet port.
During emulation, the business simulating node with route can produce the service traffics of specified type, analog satellite Network transmission course each other.Main control computer calculation sources node is to the link time-delay and the error rate of the interspace and satellite-ground link between the destination node; Give the Real-time Channel simulator these information through RS232 then; Source node here and destination node refer to prefer scene the network node of the satellite network that will simulate; Be the node of emulation, this node can adopt and be connected to the real-time satellite channel simulator and come realistic simulation, also can not have realistic simulation and only is a virtual node.
Described main control computer; Operation has system of satellite network simulation software; These software systems comprise user interface, prefer editor module, Simulation Control module, routing calculation module, link computing module, link bit error performance simulation software bag, link bit error performance parameter library, scene rendering module, network management module.Said link bit error performance simulation software bag is accomplished the simulated extraction of link bit error performance parameter, generates the link communication scene, and the simulation result of each scene all deposits link bit error performance parameter library in; The said editor module that prefers calls said Simulation Control module through user interface and controls the operation of simulating scenes, suspends and stop with generating a simulating scenes; Said routing calculation module and link computing module extract required separately configuration parameter from preferring editor module respectively; The link computing module also needs access link scene bit error performance parameter library to extract the relevant link parameter; Calculate the routing iinformation and the link property of simulating scenes; The Simulation Control module is carried out two and three dimensions with result of calculation through the scene rendering module and is played up and be presented at user interface, also these parameters is passed to real-time satellite communication equipment simulator through RS232 simultaneously; Said network management module is realized the information management to artificial network through relevant parameter in the capturing service simulation node network.The realization of each module is explained as follows: user interface adopts visual human-computer interaction technology, realizes and user interactions.Preferring editor module realizes having adopted the XML technology to realize the configuration to the various parameters of simulating scenes; Begin and concluding time, operation step-length, simulated environment etc. like emulation, and through prefer editor module can be provided with each port of Real-time Channel simulator the IP of corresponding business simulating node; The Simulation Control module then adopts multithreading to realize the control to simulating scenes; Routing calculation module has been taken all factors into consideration the path of link and the bit error performance of link in the realization of routing algorithm, calculate with average weighted mode.The link computing module mainly is the time-delay and the error rate of calculating link, on it is realized, has considered to influence the various factors of link, comprises the type, environment of link etc.Link bit error performance simulation software bag adopts the LMS model; Build by Matlab Simulink module and self-editing S function; The parameter that need import into comprises operating frequency, orbit altitude, ground based terminal movement velocity, transmitting power, transmit/receive antenna gain, receiver G/T, signal bandwidth, channel coding method, interleaving mode, modulation system, at the enterprising edlin of Matlab Simulink module.Above-mentioned all particular combination importing parameter into are called a link communication scene, and wherein any input parameter changes, will corresponding new satellite-ground link communication scenes.The simulation result of each scene all will deposit link scenario bit error performance parameter library in.Link scenario bit error performance parameter library adopts the mode of data file to preserve the bit error performance of link scenario, according to this bit error performance, just can in simulation process, calculate the parameters such as time-delay and the error rate of link in real time.
Described real-time satellite channel simulator, major function are the real-time Simulation that realizes performances such as the connection of satellite network topology, link time-delay and the error rates.The real-time satellite channel simulator is made up of with inner real time signal processing plate the cabinet of outside, and cabinet adopts the standard PC case structure, and panel is provided with mains switch, socket, RS232 interface, ethernet port, indicator light etc.The real time signal processing plate comprises fpga chip XC2vp40, SDRAM high-speed memory HY57V561620CT, power circuit, clock distribution circuit, 8 port Fast Ethernet physics transceiver LXT9785, UART interface circuit.Said power circuit provides the supply power voltage of various needs for the real time signal processing plate; Said clock distribution circuit is the clock information that FPGA, SDRAM chip produce reliable and stable; Said Ethernet physics transceiver provides Ethernet interface, via the UART interface circuit, realizes that the real-time satellite channel simulator connects with professional simulation node and main control computer.
It is the simulation that realizes the professional transmission course of satellite network that described business simulating node, operation have business simulating software, its major function.This software comprises user interface, service management and control module, thread management module, communication module, business realizing module, timer module, random number generation module, curve plotting module.Said user interface and user interactions produce a certain type service; Said service management and control module are accomplished professional generation side and recipient's establishment of connection with thread management module and communication module; Said business realizing module generates the service traffics data of user's specified type, and realizes the real-time rendering of flow curve with timer module, random number generation module, the cooperation of curve plotting module.The realization of each module is explained as follows: user interface adopts visual human-computer interaction technology, realizes and user interactions.Service management and control module adopt multithreading, realize concurrent multiple services management and control in real time.Thread management module has then adopted the api interface that underlying operating system provided to realize establishment, control and deletion to thread.The communication module technology realizes having adopted the Socket technology, and the communication mechanism of bottom is provided for transfer of data.The business realizing module is through carrying out modeling to the common miscellaneous service of satellite network (video, voice, text data) characteristic, and simulation produces various artificial service flows.Timer module encapsulates the timing mechanism interface that operating system provides, and provides support for the artificial service flow produces required timing function.The random number generation module has then been realized common random number generation algorithm, sets up for the discharge model of business realizing module to provide support.The curve plotting module then adopts the control technology, and in artificial service flow production process, the curve plotting of flow shows provides visual support.
Technique effect of the present invention is:
Can be under laboratory environment; With lower cost truly, the professional transmission course of emulation satellite network change in topology, interspace, the satellite-ground link characteristic of channel and satellite network all sidedly, the simulation study and the checking of the satellite communication system of, satellite-ground link network interspace for having provide strong support.
Description of drawings:
Fig. 1 is system global structure figure of the present invention
Fig. 2 is a satellite network of the present invention simulation software system architecture diagram
Fig. 3 is a real-time satellite channel simulator signal-processing board hardware structure diagram of the present invention
Fig. 4 is a business simulating software architecture diagram of the present invention
Embodiment:
Below, be described with reference to the accompanying drawings execution mode of the present invention.
Fig. 1 is system global structure figure of the present invention.Visible by figure, satellite network simulation system of the present invention is made up of three parts, is respectively main control computer, real-time satellite channel simulator and business simulating node.Wherein the main control computer operation has the satellite network simulation software, and the operation of business simulating node has business simulating software.The whole system operation principle is: the user is through main control computer operation satellite network simulation software; After preferring and dispose the simulating scenes parameter, editor starts emulation; Prefer editor module and realize having adopted the XML technology to realize configuration, begin and concluding time, operation step-length, simulated environment etc. like emulation to the various parameters of simulating scenes.In the simulation run process; The satellite network simulation software calculates various parameter informations such as satellite network route, link in the simulating scenes in real time; Result of calculation is played up with the mode of two and three dimensions on the one hand; Be presented at user interface, send the real-time satellite channel simulator to through the RS232 bus on the other hand, thereby realize simulation satellite network topological connection relation and link channel characteristic in data link layer.The business simulating node then under the satellite network environment of current emulation, is simulated the transmission course of the service traffics of user's specified type.
Fig. 2 is the satellite network simulation software system architecture diagram that runs on the main control computer.These software systems comprise user interface, prefer editor module, Simulation Control module, routing calculation module, link computing module, link bit error performance simulation software bag, link bit error performance parameter library, scene rendering module, network management module.The function of these software systems is responsible for also that route is calculated, link calculates and emulation satellite network management of information etc. except editor prefers, controls the function of operation of emulation.The course of work that system of satellite network simulation software is concrete is following: the simulated extraction of at first being accomplished link bit error performance parameter by link bit error performance simulation software bag; Link bit error performance simulation software bag adopts the LMS model; Build by MatlabSimulink module and self-editing S function; The parameter that need import into comprises operating frequency, orbit altitude, ground based terminal movement velocity, transmitting power, transmit/receive antenna gain, receiver G/T, signal bandwidth, channel coding method, interleaving mode, modulation system, and above-mentioned parameter is at the enterprising edlin of Matlab Simulink module.Above-mentioned all particular combination importing parameter into are called a link communication scene, and wherein any input parameter changes, will corresponding new satellite-ground link communication scenes.The simulation result of each scene all will deposit link scenario bit error performance parameter library in; Link scenario bit error performance parameter library adopts the mode of data file to preserve the bit error performance of link scenario; According to this bit error performance, just can in simulation process, calculate the parameter such as time-delay and the error rate of link in real time.Before the simulation run; User and user interface interaction; Generate a simulating scenes through preferring editor module, this scene has comprised the necessary various configuration parameters of emulation, comprising: prefer and begin and concluding time, propelling step-length; Various parameters such as the parameter of constellations such as the population of satellite, orbital plane number, orbit parameter, the type of satellite link, loss etc., and through prefer editor module can be provided with each port of Real-time Channel simulator the IP of corresponding business simulating node.After scene generated, the user can be through operation, time-out and the termination of user interface command calls Simulation Control module controls scene.In the scene running; Routing calculation module and link computing module extract routing iinformation and the link property that required separately configuration parameter (the link computing module also needs access link scene bit error performance parameter library to extract the relevant link parameter) calculates simulating scenes from preferring editor module respectively; Pass to the Simulation Control module to result of calculation then; Wherein, Routing calculation module has been taken all factors into consideration the path of link and the bit error performance of link in the realization of routing algorithm, calculate with average weighted mode; The link computing module mainly is the time-delay and the error rate of calculating link, on it is realized, has considered to influence the various factors of link, comprises the type, environment of link etc.The Simulation Control module is then according to the parameters of obtaining such as connectedness, channel type, interspace error code parameter, star ground error code parameter and time-delay; Carrying out two and three dimensions through the scene rendering module plays up and is presented at user interface; Simultaneously also these parameters are passed to real-time satellite communication equipment simulator hardware through ethernet port; Simulator is configured the error rate, time-delay according to receiving parameter; Connection characteristic, the inter satellite link characteristic of channel and the satellite-ground link characteristic of channel of interspace, the satellite-ground link network of real-time Simulation on data link layer.In the simulation run process, each other can the transport service flow at business simulating node with route, these business simulating nodes have been formed the business simulating meshed network.Network management module is through the various parameters of capturing service simulation node network, such as receiver packet number, transmission bag number, packet loss, transmission speed or the like.Network management module is realized the information management to artificial network through above-mentioned parameter in the capturing service simulation node network.
Fig. 3 is a real-time satellite channel simulator signal-processing board hardware structure diagram.The real time signal processing plate comprises fpga chip, SDRAM high-speed memory, power circuit, clock distribution circuit, Ethernet physics transceiver, UART interface circuit, and said power circuit provides the supply power voltage of various needs for the real time signal processing plate; Said clock distribution circuit is the clock information that FPGA, SDRAM chip produce reliable and stable; Said Ethernet physics transceiver provides Ethernet interface, via the UART interface circuit, realizes that the real-time satellite channel simulator connects with professional simulation node and main control computer.The function of each several part is following: fpga chip XC2vp40 is responsible for the actuating logic instruction, is real-time satellite channel simulator control core; SDRAM high-speed memory HY57V561620CT is used to accomplish the delay function of link data bag; In order emulated port to be realized time-delay respectively, each emulated port is used a slice SDRAM, and every sdram size is 256Mbit; The highest read or write speed can reach 133MHz; Be divided into 8 memory spaces, calculate (there are data in link, and does not exist between the packet intermittently) always by maximum rate; Attainable maximum delay is 256/8/100=320ms between then per two ports, satisfies the requirement (demand that how much depends on the user of actual emulation port here) of satellite network link simulation time-delay; The power circuit major function is the 220V alternating current of input, converts direct current 5V and 12V into through Switching Power Supply, and wherein the 12V DC power supply is used for the system fan power supply, and 5V voltage then further converts the required supply power voltage of various chips on the signal-processing board into; Clock distribution circuit is the clock information that chips such as FPGA, SDRAM produce reliable and stable; 8 port Fast Ethernet physics transceiver LXT9785 provide Ethernet interface; Via the UART interface circuit, realize that the real-time satellite channel simulator connects with professional simulation node, LXT9785 is the 8 port Fast Ethernet physics transceivers of being produced by Intel Company; Support 10Mbps and 100Mbps network; Can satisfy 802.3 substandard various application demands, its mode of operation need not carried out commands for controlling by the auxiliary circuit setting; The UART interface circuit is realized the interface signal conversion that the real-time satellite channel simulator is connected with main control computer; Consider the convenience of connection; The link of main control computer uses the DB9 joint; The real-time satellite channel simulator then adopts the RJ45 joint, and stube cable uses twisted-pair feeder, and the connected mode of cable is compatible with the configuration cable of router.
Described real-time satellite channel simulator also comprises outside cabinet, and cabinet adopts the standard PC case structure, and panel is provided with mains switch, supply socket, RS232 interface, netting twine socket, indicator light etc.
Fig. 4 is the business simulating software architecture diagram.This software comprises user interface, service management and control module, thread management module, communication module, business realizing module, timer module, random number generation module, curve plotting module.The workflow of business simulating software is following: the user is through producing a certain type service with user interface interaction; Start service management and control module; This module has been accomplished professional generation side and recipient's establishment of connection with thread management module and communication module; Wherein, user interface adopts visual human-computer interaction technology, realizes and user interactions; Service management and control module adopt multithreading, realize concurrent multiple services management and control in real time; Thread management module has then adopted the api interface that underlying operating system provided to realize establishment, control and deletion to thread; The communication module technology realizes having adopted the Socket technology, and the communication mechanism of bottom is provided for transfer of data.Transmit leg begins to call the service traffics data that the business realizing module generates user's specified type.In the process that business is sent and received, the business realizing module can realize the real-time rendering of flow curve with timer module, random number generation module, the cooperation of curve plotting module.Wherein, The business realizing module is the nucleus module that service traffics produce; According to the data that service management and control module are imported into, business is shunted processing, promptly the data text services, speech business or the video traffic processing module that have flowed to lower floor respectively handled; The business realizing module is through carrying out modeling to the common miscellaneous service of satellite network (video, voice, text data) characteristic, and simulation produces various artificial service flows; Timer module encapsulates the timing mechanism interface that operating system provides, and provides support for the artificial service flow produces required timing function; The random number generation module has then been realized common random number generation algorithm, sets up for the discharge model of business realizing module to provide support; The curve plotting module then adopts the control technology, and in artificial service flow production process, the curve plotting of flow shows provides visual support.
Specific embodiment of satellite network the present invention is following:
This embodiment scene is the satellite network that the Walker constellation (4 orbital planes, each orbital plane have 6 satellites) that comprises 24 satellites is formed.Assess for various performances, can adopt following step this satellite network:
1. with main control computer, business simulating node A, business simulating Node B are connected with the real-time satellite channel simulator;
2. the system of satellite network simulation software on the operation main control computer; Set up simulating scenes through preferring editting function, comprise the Walker constellation that increases by 24 satellites, select routing algorithm, link parameter is set; Through prefer editor module can be provided with each port of Real-time Channel simulator the IP of corresponding business simulating node; If this port does not connect the business simulating node, then need not to be provided with, start emulation through menucommand then;
3. during simulation run; System of satellite network simulation software on the main control computer will the topological relation, link parameter, routing parameter etc. of satellite network calculate in real time constantly to current emulation; And result of calculation shown on user interface through three-dimensional, two-dimentional rendering module in real time; Main control computer sends result of calculation to the real-time satellite channel simulator through the RS232 bus on the other hand; The real-time satellite channel simulator is controlled, and the parameter that the real-time satellite channel simulator is passed to according to main control computer is in data link layer analog satellite network topology relation, link time-delay and the error rate; Thereby realize simulation to satellite network topological connection relation and link channel characteristic in data link layer;
4. business simulating node A, business simulating Node B are moved business simulating software respectively, and on simulation node A, the type of service of selecting institute to produce through user interface, and the configuration parameter of being correlated with are selected to business simulating Node B transport service flow then.Under current simulating scenes,, then can see traffic transmission process and transmission rate from the user interface of business simulating software separately if having route between business simulating node A and the business simulating Node B;
5. the satellite network simulation software system start-up network management module from the main control computer; Network management module is under the current simulating scenes; The various parameters of satellite network are collected and are added up, and on user interface, show time-delay, the error rate and the service traffics statistical information of each bar link in the satellite network in real time.
Through above-mentioned steps, can under ground environment, realize real-time Simulation to characteristics such as satellite network topology, link time-delay, the error rate and professional transmission courses.
Claims (4)
1. a satellite network simulation system is characterized in that, comprises a main control computer, a real-time satellite channel simulator and some business simulating node computers; Operation has system of satellite network simulation software on the said main control computer, can realize setting up the satellite network simulating scenes, selects routing algorithm, link parameter is set, and management emulation satellite network information is connected with the real-time satellite channel simulator through the RS232 bus; Operation has business simulating software on the said business simulating node, realizes the simulation of the professional transmission course of satellite network is connected with the real-time satellite channel simulator through ethernet port;
System of said satellite network simulation software comprises user interface, prefers editor module, Simulation Control module, routing calculation module, link computing module, link bit error performance simulation software bag, link bit error performance parameter library, scene rendering module, network management module; Wherein: said link bit error performance simulation software bag is accomplished the simulated extraction of link bit error performance parameter; Generate the link communication scene, the simulation result of each scene all deposits link bit error performance parameter library in; The said editor module that prefers calls said Simulation Control module through user interface and controls the operation of simulating scenes, suspends and stop with generating a simulating scenes; Said routing calculation module and link computing module extract required separately configuration parameter from preferring editor module respectively; The link computing module also needs access link scene bit error performance parameter library to extract the relevant link parameter; Calculate the routing iinformation and the link property of simulating scenes; The Simulation Control module is carried out two and three dimensions with result of calculation through the scene rendering module and is played up and be presented at user interface, also these parameters is passed to real-time satellite communication equipment simulator through RS232 simultaneously; Said network management module is realized the information management to artificial network through relevant parameter in the capturing service simulation node network;
Said business simulating software comprises user interface, service management and control module, thread management module, communication module, business realizing module, timer module, random number generation module, curve plotting module; Wherein: said user interface and user interactions produce a certain type service; Said service management and control module are accomplished professional generation side and recipient's establishment of connection with thread management module and communication module; Said business realizing module generates the service traffics data of user's specified type, and realizes the real-time rendering of flow curve with timer module, random number generation module, the cooperation of curve plotting module.
2. the system of claim 1; It is characterized in that; The said link bit error performance bag employing LMS of simulation software model; Build by Matlab Simulink module and self-editing S function,, comprise operating frequency, orbit altitude, ground based terminal movement velocity, transmitting power, transmit/receive antenna gain, receiver G/T, signal bandwidth, channel coding method, interleaving mode, modulation system through import the parameter that needs at the enterprising edlin of Matlab Simulink module.
3. the system of claim 1 is characterized in that, said real-time satellite channel simulator comprises outside cabinet and inner real time signal processing plate, and said cabinet panel is provided with mains switch and socket, RS232 interface; Said real time signal processing plate comprises fpga chip, SDRAM high-speed memory, power circuit, clock distribution circuit, Ethernet physics transceiver, UART interface circuit, and said power circuit provides the supply power voltage of various needs for the real time signal processing plate; Said clock distribution circuit is the clock information that FPGA, SDRAM chip produce reliable and stable; Said Ethernet physics transceiver provides Ethernet interface, via the UART interface circuit, realizes that the real-time satellite channel simulator connects with professional simulation node and main control computer.
4. the system of claim 1 is characterized in that, said business simulating software also comprises text services, speech business and video traffic processing module.
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