CN101404547A - 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 of the satellite network carrying data traffic skewness that region and time zone difference, constellation running and earth rotation cause, make it both be different from torus network traditionally, be different from the terrestrial wireless communication network again.At this characteristics of satellite network, be necessary its performance is assessed, thereby provide reference for satellite network design.
The satellite network Performance Evaluation can utilize satellite or aircraft to survey, 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, both at home and abroad mainly contain modes such as software modeling emulation, channel simulator, wherein the mode flexible configuration of software modeling emulation at the emulation of the characteristic of satellite network, 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 by 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 by 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 as follows:
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 described 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 by the RS232 bus; Operation has business simulating software on the described business simulating node, realizes the simulation of the professional transmission course of satellite network is connected with the real-time satellite channel simulator by 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 calculates link time-delay and the error rate of source node to the interspace and satellite-ground link between the destination node, give the Real-time Channel simulator these information by RS232 then, source node herein and destination node refer to the network node that prefers the satellite network that scene will simulate, it is the node of an 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.Described link bit error performance simulation software bag is finished 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 described editor module that prefers calls described Simulation Control module by user interface and controls the operation of simulating scenes, suspends and stop with generating a simulating scenes; Described 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 by 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 by RS232 simultaneously; Described network management module is realized information management to artificial network by relevant parameter in the capturing service simulation node network.The realization of each module is described 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 configuration to the various parameters of simulating scenes, begin and concluding time, operation step-length, simulated environment etc. as emulation, and by 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 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 in average weighted mode.The link computing module mainly is the time-delay and the error rate of calculating link, has considered to influence the various factors of link on it is realized, 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 combinations 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 calculate parameters such as the time-delay of link and the error rate in real time in simulation process.
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 the cabinet and the inner real time signal processing plate 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.Described power circuit provides the supply power voltage of various needs for the real time signal processing plate; Described clock distribution circuit is that FPGA, SDRAM chip produce reliable and stable clock information; Described 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.Described user interface and user interactions produce a certain type service, described service management and control module are finished professional generation side and recipient's establishment of connection with thread management module and communication module, described 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 described 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, the control to thread and delete.The communication module technology has adopted the Socket technology on realizing, the communication mechanism of bottom is provided for transfer of data.The business realizing module is by 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 embodiments of the present invention.
Fig. 1 is system global structure figure of the present invention.As seen from the 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 by main control computer operation satellite network simulation software, after preferring and dispose the simulating scenes parameter, editor starts emulation, preferring editor module realizes having adopted the XML technology to realize beginning configuration to the various parameters of simulating scenes and concluding time, operation step-length, simulated environment etc. as emulation.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 in the mode of two and three dimensions on the one hand, be presented at user interface, send the real-time satellite channel simulator to by the RS232 bus on the other hand, thereby in the simulation of data link layer realization to satellite network topological connection relation and link channel characteristic.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 as follows: the simulated extraction of at first being finished 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, the ground based terminal movement velocity, transmitting power, the transmit/receive antenna gain, receiver G/T, signal bandwidth, channel coding method, interleaving mode, modulation system, above-mentioned parameter is at the enterprising edlin of Matlab Simulink module.Above-mentioned all particular combinations 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 parameters such as the time-delay of link and the error rate in real time.Before the simulation run, user and user interface interaction, generate a simulating scenes by preferring editor module, this scene has comprised the necessary various configuration parameters of emulation, comprise: 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 by 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 by 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, then result of calculation is passed to the Simulation Control module, 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 in average weighted mode; The link computing module mainly is the time-delay and the error rate of calculating link, has considered to influence the various factors of link on it is realized, 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 by 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 by 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 by 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 information management to artificial network by 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 described power circuit provides the supply power voltage of various needs for the real time signal processing plate; Described clock distribution circuit is that FPGA, SDRAM chip produce reliable and stable clock information; Described 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 as follows: 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 finish the delay function of link data bag, for emulated port being realized time-delay respectively, each emulated port is used a slice SDRAM, every sdram size is 256Mbit, the highest read or write speed can reach 133MHz, be divided into 8 memory spaces, (there are data in link always by maximum rate calculating, and do not exist between the packet intermittently), 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, is converted to direct current 5V and 12V through Switching Power Supply, and wherein the 12V DC power supply is used for the system fan power supply, and 5V voltage then further is converted to the required supply power voltage of various chips on the signal-processing board; Clock distribution circuit is that chips such as FPGA, SDRAM produce reliable and stable clock information; 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 does not need to carry 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, stube cable uses twisted-pair feeder, and the connected mode of cable is with the configuration cable compatibility 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 as follows: the user is by producing a certain type service with user interface interaction, start service management and control module, this module has been finished 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, the control to thread and delete; The communication module technology has adopted the Socket technology on realizing, 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 sends and receives, 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, the data of importing into according to service management and control module, business is shunted processing, be that text services, speech business or the video traffic processing module that data have flowed to lower floor respectively handled, the business realizing module is by 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 as follows:
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 by preferring editting function, comprise the Walker constellation that increases by 24 satellites, select routing algorithm, link parameter is set, by 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 by menucommand then;
3. during simulation run, system of satellite network simulation software on the main control computer will be to the topological relation of current emulation moment satellite network, link parameter, routing parameters etc. calculate in real time, and result of calculation is passed through three-dimensional, the two dimension rendering module shows on user interface in real time, main control computer sends result of calculation to the real-time satellite channel simulator by the RS232 bus on the other hand, the real-time satellite channel simulator is controlled, the parameter that the real-time satellite channel simulator is passed to according to main control computer concerns in data link layer analog satellite network topology, the link time-delay and the error rate; Thereby in the simulation of data link layer realization to satellite network topological connection relation and link channel characteristic;
4. business simulating node A, business simulating Node B are moved business simulating software respectively, on simulation node A, select the type of service that will produce by user interface, and the configuration parameter of being correlated with, and select then to business simulating Node B transport service flow.Under current simulating scenes,, then can see professional transmission course 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 show time-delay, the error rate and the service traffics statistical information of each bar link in the satellite network on user interface in real time.
By 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 (6)
1, a kind of 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 described 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 by the RS232 bus; Operation has business simulating software on the described business simulating node, realizes the simulation of the professional transmission course of satellite network is connected with the real-time satellite channel simulator by ethernet port.
2, the system as claimed in claim 1, it is characterized in that, system of described 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:
Described link bit error performance simulation software bag is finished 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 described editor module that prefers calls described Simulation Control module by user interface and controls the operation of simulating scenes, suspends and stop with generating a simulating scenes; Described 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 by 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 by RS232 simultaneously; Described network management module is realized information management to artificial network by relevant parameter in the capturing service simulation node network.
3, system as claimed in claim 2, it is characterized in that, the described link bit error performance bag employing LMS of simulation software model, build by Matlab Simulink module and self-editing S function, by import the parameter that needs at the enterprising edlin of Matlab Simulink module, 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.
4, the system as claimed in claim 1 is characterized in that, described real-time satellite channel simulator comprises outside cabinet and inner real time signal processing plate, and described cabinet panel is provided with mains switch and socket, RS232 interface; Described real time signal processing plate comprises fpga chip, SDRAM high-speed memory, power circuit, clock distribution circuit, Ethernet physics transceiver, UART interface circuit, and described power circuit provides the supply power voltage of various needs for the real time signal processing plate; Described clock distribution circuit is that FPGA, SDRAM chip produce reliable and stable clock information; Described 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.
5, the system as claimed in claim 1, it is characterized in that, described business simulating software comprises user interface, service management and control module, thread management module, communication module, the business realizing module, timer module, the random number generation module, the curve plotting module, wherein: described user interface and user interactions produce a certain type service, described service management and control module are finished professional generation side and recipient's establishment of connection with thread management module and communication module, described business realizing module generates the service traffics data of user's specified type, and and timer module, the random number generation module, the curve plotting module is the real-time rendering of cooperation realization flow curve together.
6, system as claimed in claim 5 is characterized in that, described business simulating module also comprises text services, speech business and video traffic processing module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100358317C (en) * | 2002-09-09 | 2007-12-26 | 中国科学院软件研究所 | Community broad band Integrated service network system |
| CN1633087A (en) * | 2004-12-09 | 2005-06-29 | 中国科学院软件研究所 | A method of constellation parameter measurement for low-orbit pole-constellation satellite communication system |
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