CN116131900A - Broadband satellite communication verification system and method - Google Patents
Broadband satellite communication verification system and method Download PDFInfo
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- CN116131900A CN116131900A CN202211435912.2A CN202211435912A CN116131900A CN 116131900 A CN116131900 A CN 116131900A CN 202211435912 A CN202211435912 A CN 202211435912A CN 116131900 A CN116131900 A CN 116131900A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/41—Flow control; Congestion control by acting on aggregated flows or links
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a broadband satellite communication verification system, comprising: user segment, channel, space segment and ground segment; a user segment, comprising: broadband terminal station principle model, large-scale terminal station simulator, beam hopping modulation terminal, beam hopping demodulation terminal and service simulator; a channel, comprising: a satellite channel simulator; a space segment comprising: on-board digital transparent processor principle prototype and beam jump analog load; a ground section comprising: a network management system, a gateway station principle prototype and a gateway station simulator; the broadband terminal station principle model machine is used for receiving and transmitting Ka frequency band signals, and performing power amplification, up-conversion and down-conversion on the Ka frequency band signals to complete modulation, demodulation, processing and forwarding of data. The invention solves the problems that related verification systems and verification methods are lacking at present, and technical feasibility verification cannot be provided for engineering application.
Description
Technical Field
The invention relates to a broadband satellite communication verification system and a broadband satellite communication verification method, and belongs to the technical field of broadband communication systems.
Background
The conventional broadband satellite communication verification system only aims at the traditional Ka frequency band transparent forwarding mode, and cannot meet the demonstration verification of the Q/V link characteristic, satellite-ground integrated beam jump and the satellite broadband communication system of the novel system.
Disclosure of Invention
The invention solves the technical problems that: the system and the method for verifying the broadband satellite communication can demonstrate and verify the performance and the service capacity of the broadband satellite communication link of the novel communication system, and solve the problem that the related verification system and verification method are lacking at present and the technical feasibility verification cannot be provided for engineering application.
The solution of the invention is as follows:
a broadband satellite communication authentication system, comprising: user segment, channel, space segment and ground segment;
a user segment, comprising: broadband terminal station principle model, large-scale terminal station simulator, beam hopping modulation terminal, beam hopping demodulation terminal and service simulator;
a channel, comprising: a satellite channel simulator;
a space segment comprising: on-board digital transparent processor principle prototype and beam jump analog load;
a ground section comprising: a network management system, a gateway station principle prototype and a gateway station simulator;
the broadband terminal station principle model machine is used for receiving and transmitting Ka frequency band signals, and carrying out power amplification, up-conversion and down-conversion on the Ka frequency band signals to complete modulation, demodulation, processing and forwarding of data;
the large-scale terminal station simulator is used for simulating a large number of user terminals and verifying a satellite communication test system supporting a super-large capacity broadband system;
the beam hopping modulation terminal is used for controlling framing, generating baseband data and modulating a beam hopping signal;
the beam hopping demodulation terminal is used for demodulating the beam hopping signal and finishing the frame decomposition and statistics of the signal;
the service simulator is used for generating a service data source and is used for the centralized management and control of the gateway station simulator and the gateway station principle model machine and the demonstration verification of service diversion;
the satellite channel simulator is used for simulating the Q/V frequency band transmission channel environment, receiving the terminal signals output by the station switching principle model machine, adding noise to the terminal signals and delaying transmission, and outputting the terminal signals to the large-scale terminal station simulator; meanwhile, receiving a terminal signal output by a large-scale terminal station simulator, adding noise to the signal, delaying transmission, and outputting the signal to a gateway station principle model machine;
the principle model of the on-board digital transparent processor supports information interaction and flexible cross-beam interaction between any frequency band and any bandwidth on the board, and is used for completing verification of a digital transparent processing technology;
the beam hopping simulation load receives the beam hopping signals and the signaling, and outputs the received beam hopping signals at a specific output port; combining the jumping beam demodulation terminal and the jumping beam modulation terminal to support the satellite-ground integrated jumping beam for demonstration and verification;
the network management system is used for uniformly managing and scheduling the satellite resources of the whole network, monitoring and managing all equipment in the satellite communication network, and controlling and distributing the resources of the terminal equipment;
the gateway station principle model machine is used for satellite resource management and distribution, baseband data processing, packaging, modulation, demodulation, error correction and satellite interface adaptation;
the gateway station simulator supports 3 beams, each beam is configured with a network segment, and each network segment supports 1 forward carrier and a return carrier with corresponding bandwidth;
the satellite channel simulator receives signals output by a station switching principle model machine, applies the distortion of multipath fading, doppler frequency shift, shadow fading and rain attenuation to the signals before adding noise and transmission delay to the signals, and outputs the signals to a user terminal; and receiving a signal output by the user terminal, applying the distortion of multipath fading, doppler frequency shift, shadow fading and rain fade to the signal before adding noise and transmission delay to the signal, and outputting the signal to a gateway station principle model machine.
A broadband satellite communication authentication method, comprising:
and (3) communication system verification: the terminal station principle model machine is utilized to realize the forward link broadband signal receiving and carry out UDP and TCP service transmission; realizing network access by using a terminal station principle model machine, and checking the network access state of the terminal in a network management system;
and (3) centralized management and control of gateway stations and service diversion verification: the network management is used for centralized management of a plurality of gateway station baseband equipment and terminals, the service is transmitted between the terminals of the same gateway station, the service is transmitted between the terminals of different gateway stations, and a service distribution mechanism is verified through a service transmission path and time delay;
satellite-ground integrated beam jumping verification: based on the hopping beam modulation terminal, the hopping beam simulation load and the hopping beam demodulation terminal, satellite-ground integrated hopping beam verification is realized;
Q/V link characteristics verify system impact: based on a Q/V channel simulator, a large-scale terminal station simulator, a network management system and a gateway station principle model machine, simulating self-adaptive high-order code modulation under a Q/V frequency band channel, and evaluating the influence of the system;
mass terminal access management verification: designing a testing environment under the scaling condition, using a broadband terminal station principle model machine and a large-scale terminal station simulator to realize mass terminal access simulation demonstration verification, simulating terminal accesses of different scenes, modeling through a terminal access management system, and verifying the capability of the system for supporting mass terminals;
digital transparent processing function verification: demonstration verification is carried out on the multi-bandwidth transformation capability of the digital transparent processor; meanwhile, demonstration verification is carried out on the flexible sub-channel power control capability of the digital transparent processor, and the power of each sub-channel is independently adjusted.
Further, the communication system verification includes:
connecting a gateway station principle prototype with a satellite channel simulator and a broadband terminal station principle prototype;
the network management system is used for controlling the output symbol rate, the code modulation mode and the transmission rate of the gateway station principle model machine;
the parameters of a principle model machine of the broadband terminal station are adjusted to parameters matched with a gateway station simulator, whether the terminal can successfully access the network is observed, and the transmission rate of the terminal is recorded;
and based on the communication verification system environment, carrying out a terminal forward and return rate test, a rain failure resistance test, a terminal management and resource dynamic allocation capability test.
Further, the centralized management and control of the gateway station and the service diversion verification include:
the method comprises the steps of building a gateway station principle model machine, a gateway station simulator, a satellite channel simulator and a network management system into a distributed gateway station structure;
the network management system is used for carrying out centralized deployment, and the network management system is used for carrying out demonstration of centralized management functions of the gateway station, including equipment management, state monitoring, alarm management and performance management, on the gateway station principle model machine and the gateway station simulator.
Further, the satellite-ground integrated beam hopping verification includes:
the monitoring interface of the beam hopping modulation terminal sets the beam residence time proportion;
using a real-time spectrometer to observe whether the signal is a continuous signal at the entrance of the beam-jump simulation load;
using a real-time spectrometer to observe whether the signal is a burst signal at the outlet of the beam-jumping simulation load;
and observing the receiving frame number of the beam hopping demodulation terminal and recording data.
Further, the verification of the influence of the Q/V link characteristic on the system comprises the following steps:
configuring a network management system to enable a communication verification system to work in an ACM mode;
enabling a broadband terminal principle prototype to access to the network with a set signal-to-noise ratio, and checking the signal-to-noise ratio and the modulation mode of the terminal at the moment;
the attenuation of the Q/V frequency band satellite channel simulator is regulated, so that the signal-to-noise ratio of the broadband terminal is reduced, and then the forward modulation mode of the broadband terminal principle model machine at the moment is checked;
continuously adjusting and reducing the signal to noise ratio, checking whether the modulation mode of the broadband terminal principle prototype is changed, observing a change trend if the modulation mode is changed, and recording data.
Further, the mass terminal access management verification includes:
connecting a gateway station principle prototype with a large-scale terminal simulator;
simulating a terminal by using a large-scale terminal simulator based on the communication verification system environment;
executing the terminal network access flow, and checking the terminal network access state through the network management system.
Further, the digital transparent processing function verification includes:
connecting a gateway station principle model machine, a gateway station simulator, a satellite channel simulator and an on-board digital transparent processor principle model machine with a broadband terminal station principle model machine;
setting a code modulation mode, a transmission rate and a receiving and transmitting frequency point parameter of a gateway station principle model machine and a gateway station simulator by using a network management system;
adjusting bandwidth allocation, routing and sub-channel power parameters of a principle model machine of the on-board digital transparent processor;
and adjusting the parameters of the corresponding user terminal to parameters matched with the gateway station principle model machine and the gateway station simulator, observing whether the terminal can successfully access the network, and recording the transmission rate of the terminal.
Furthermore, the gateway station principle prototype and the gateway station simulator are connected with 2 broadband terminal station principle prototypes in an intermediate frequency mode.
Furthermore, 2 broadband terminal station principle prototypes are simultaneously accessed to the same gateway station to carry out terminal Internet access, voIP call and video demonstration, and terminal service distribution under the same gateway station is verified.
Compared with the prior art, the invention has the beneficial effects that:
(1) The ultra-large capacity broadband satellite communication verification system supports the modes of self-adaptive high-order coded modulation, variable carrier rate, power control, dynamic allocation, beam jump and the like, and realizes satellite-to-ground transmission, system management and resource allocation of mass terminals;
(2) The invention is constructed by adopting a modularized thought, has the characteristics of high flexibility and strong expansibility, can be realized by software and hardware together, and is changed into a semi-physical simulation demonstration verification system to provide a more real and credible simulation environment;
(3) The invention realizes the verification of the broadband satellite communication system based on DVB-S2x/DVB-RCS2 protocol through the ground terminal, the gateway station principle prototype and the satellite channel simulator, and solves the problem that the demonstration verification of the satellite broadband communication system with Q/V link characteristics, satellite-ground integrated jumping beams and a novel system cannot be satisfied;
(4) The invention realizes the performance test of the service rates of different signals under different channel conditions through the satellite channel simulator, the gateway station principle model machine and the network management center, simultaneously provides relevant network management services such as management, configuration, alarm and the like of the whole satellite communication network, and provides more comprehensive technical feasibility verification for engineering application.
Drawings
FIG. 1 is a diagram of the system of the present invention.
Detailed Description
The invention is further illustrated below with reference to examples.
A novel satellite communication verification system of ultra-large capacity broadband system, as shown in figure 1, comprises: user segment, channel, space segment, ground segment.
A user segment, comprising: broadband terminal station principle model, large-scale terminal station simulator, beam hopping modulation terminal, beam hopping demodulation terminal and business simulator; user segments for use in simulating an actual broadband satellite communication system;
a channel, comprising: a satellite channel simulator; for simulating satellite channels in an actual broadband satellite communication system;
a space segment comprising: on-board digital transparent processor principle prototype and beam jump simulation load; for simulating a space segment in an actual broadband satellite communication system;
a ground section comprising: a network management system, a gateway station principle prototype and a gateway station simulator; a ground segment for simulating an actual broadband satellite communication system;
the wideband terminal station principle prototype is mainly used for receiving and transmitting Ka frequency band signals, and performing power amplification, up-conversion and down-conversion on the Ka frequency band signals. And finishing the modulation, the demodulation, the processing and the forwarding of the data. Various application devices of the user are connected with the switch through the network port to access the satellite network; the transmission rate can reach 200Mbps at the downlink and 20Mbps at the uplink; supporting adaptive power control, adaptive carrier adjustment and transmission of modulation coding modes; support downlink DVB-S2X, ACM, uplink DVB-RCS2, MF-TDMA access;
the large-scale terminal station simulator is used for simulating a large number of user terminals and verifying a satellite communication test system supporting a super-large capacity broadband system; supporting the access quantity of the analog terminals to be not less than 3000; the analog terminal and the broadband terminal principle prototype can be simultaneously accessed into the gateway system;
supporting the state statistics of the analog terminal;
the main functions of the beam hopping modulation terminal comprise framing control, baseband data generation and beam hopping signal modulation; output frequency range: 2400 MHz-4000 MHz; output power: -40 dBm-0 dBm; output port interface: an N-type interface;
the beam hopping demodulation terminal mainly provides beam hopping signal demodulation, and a signal frame decomposition and statistics function; input frequency range: 2400 MHz-4000 MHz; input frequency bandwidth: 45MHz; input power: -20dBm to-60 dBm; input port interface: an N-type interface;
the service simulator is used for generating service data sources such as FTP service, voIP service, video service and the like, supporting centralized management and control of the gateway station simulator and the gateway station principle model machine and demonstration verification of service distribution; the simulation of a plurality of access systems such as random access, reserved access, on-demand access and the like is supported; multiple resource allocation system simulation such as fixed allocation, on-demand allocation, competitive allocation and the like is supported;
the satellite channel simulator is used for simulating the Q/V frequency band transmission channel environment. Receiving a terminal signal output from a station switching principle model machine, adding noise to the terminal signal and delaying transmission, and outputting the terminal signal to a terminal simulator; meanwhile, receiving a signal output from a user section, adding noise to the signal, delaying transmission, and outputting the signal to a gateway station principle model machine; the Q/V frequency band satellite-ground transmission channel simulator has 4 physical channel numbers, and the channel bandwidth is as follows: 125MHz, satellite link delay: 1us to a maximum 1.5s precision;
the principle model of the on-board digital transparent processor supports information interaction and flexible cross-beam interaction between any frequency band and any bandwidth on the board, avoids the constraint of a satellite communication system, and supports the verification of a digital transparent processing technology; in the digital transparent processing forwarding, firstly, a broadband channel is divided into fine particle channels through digital channelization, then channel circuit switching is carried out between input and output ports, and finally, sub-channels are synthesized and then output;
the beam hopping simulation load receives the beam hopping signals and the signaling, and outputs the received beam hopping signals at a specific output port. The splitter completes the splitting of the signals and respectively gives the signals to the signaling demodulator and the beam switch; the signaling demodulator receives the signaling signal, and the intermediate frequency module of the demodulator changes the received radio frequency signal to the baseband. The baseband signal processing unit adopts a high-capacity FPGA. The baseband part completes signal demodulation, extracts signaling signals, generates a switch switching command and sends the switch switching command to the beam switch; the beam switch is composed of a switch controller and a radio frequency switch. The switch controller receives a switch switching command and controls the switch to switch. The radio frequency switch is a high-performance electronic switch, so that an input signal can be rapidly switched among a plurality of output ports, and the switching time is extremely short;
the network management system performs unified management and scheduling on satellite resources of the whole network, monitors and manages all devices in the satellite communication network, and controls and allocates resources to the terminal devices. The network management system realizes the functions of configuration management, monitoring management, fault management, performance management, system management, user management and the like. The NMS supports HNO/VNO operation and maintenance functions, and simultaneously provides information service for a service operation support system (BSS/OSS) system through a standard northbound interface, and mainly comprises relevant interfaces such as alarm, flow and the like, so as to provide support for maintenance;
the gateway station principle model machine is mainly used for the functions of satellite resource management and distribution, baseband data (business data and network management data) processing, packaging, modulation, demodulation, error correction, satellite interface adaptation and the like. The modulator performs the coding (bch+ldpc) modulation functions specified by the DVB-S2x protocol for outbound data encapsulation. The demodulator performs the demodulation and decoding functions specified by the inbound DVB-RCS2 protocol. The satellite-ground integrated beam hopping communication capacity is realized by being matched with a beam hopping load controller;
the gateway station simulator comprises a baseband chassis, a modulator, a burst demodulator, a network control board and a baseband switching board; the baseband chassis provides the bearers for modulators, burst demodulators, baseband switching boards, IF interface boards, etc. The modulator performs the forward data encapsulation and coding (bch+ldpc) modulation functions specified by the DVB-S2 protocol. The burst demodulator performs demodulation (QPSK) and decoding functions specified by the backhaul DVB-RCS protocol. The baseband switching board card completes the Ethernet switching function;
a novel satellite communication verification method of ultra-large capacity broadband system comprises the following steps:
comprising the following steps: the system comprises a new generation ultra-large capacity advanced communication system verification stage, a gateway station centralized management and control and service diversion verification stage, a satellite-ground integrated beam jumping key technology verification stage, a system influence verification stage by Q/V link characteristics, a mass terminal access management verification stage and a digital transparent processing function verification stage;
the verification phase of the new generation ultra-large capacity communication system comprises the following steps:
step (1) connecting a gateway station principle prototype with a satellite channel simulator and a broadband terminal station principle prototype;
setting the output symbol rate, the code modulation mode, the transmission rate and the like of the station-closing principle prototype by using a network management system;
step (3) adjusting parameters of a user terminal principle model machine into parameters matched with a gateway station simulator, observing whether the terminal can successfully access the network, and recording the transmission rate of the terminal;
and (4) based on the demonstration verification system environment, carrying out terminal forward and return rate tests, rain failure resistance tests, terminal management and resource dynamic allocation capability tests.
For example, the forward and return rate verification phase for a terminal is as follows:
1) Connecting a gateway station principle model machine with a terminal intermediate frequency and a frequency spectrograph through a branching device;
2) Setting forward link symbol rates to be 1Msps, 30Msps, 100Msps and 500Msps respectively through a network management interface, and measuring forward link bandwidth by utilizing a spectrometer; setting symbol rates of a return link to be 125Ksps, 1Msps, 4Msps, 8Msps and 12.5Msp respectively through a network management interface, and measuring the bandwidth of the return link by utilizing a spectrometer;
3) Checking forward and return symbol rates at a terminal interface, wherein the interface displays the actual measurement result to be consistent with the configuration and passes through;
for example, the test verification phase for rain fade resistance is as follows:
1) Setting forward link symbol rates to be 30Msps, 10Msps and 5Msps respectively through a network management interface to carry out network access test of the terminal station, and measuring the success of network access of the terminal station according to the measured result;
2) Setting forward/return ACM modulation parameters through a network management interface, and checking the signal-to-noise ratio state of the terminal station through modulating channel simulator parameters so as to test the ACM self-adaptive adjustment function. The actual measurement result terminal station modcod can be adaptively adjusted;
3) Increasing the attenuation value of the return link channel simulator, and switching the actual measurement result small station from a 10Msps carrier to a 5Msps carrier;
for example, the steps of the capability stage for terminal management and dynamic resource allocation are as follows:
1) Newly adding a terminal station 1 and a terminal station in the terminal station, wherein the addition is successful;
2) The back carrier rate is configured to be 1Msps, the coding mode is 8PSK5/6, and the data is received correctly;
3) The terminal 1 sends back data of 2Mbps; the maximum receivable 2Mbps of the terminal station;
4) The terminal station 2 sends back data, and both the terminal station 1 and the terminal station 2 can receive 1Msps;
the steps of the gateway station centralized management and control and service diversion verification stage are as follows:
step (1), a gateway station principle model machine, a gateway station simulator, a satellite channel simulator and a network management system are built into a distributed gateway station structure;
the network management system is deployed in a centralized way, and a network management system is used for demonstrating centralized management functions of the gateway station, such as equipment management, state monitoring, alarm management, performance management and the like, for the gateway station principle model machine and the gateway station simulator;
step (3), connecting a gateway station principle prototype and a gateway station simulator with 2 terminal intermediate frequencies;
step (4) 2 terminal principle prototypes are simultaneously accessed into the same gateway station to carry out terminal Internet access, voIP call and video demonstration, and terminal service distribution under the same gateway station is verified;
step (5) 2 terminal principle prototypes, 1 access gateway station principle prototypes system, and 1 access gateway station simulator to perform 2 terminal Internet access, voIP call and video demonstration to verify service diversion functions under different gateway stations;
for example, the steps of the centralized control and service diversion stage for the gateway station are as follows:
1) Setting forward link symbol rates to be respectively 50Msps and returning to be 12Msps through a network management interface to carry out network access test on the terminal station, wherein the network access of the terminal station is successful;
2) The broadband terminal principle prototype is connected with the service simulator, the video conference system and the IP telephone, and the gateway station simulator is connected with the application server, the video conference system and the IP telephone, so that the connection is successful;
3) The broadband terminal principle prototype sends a video service request to the gateway station simulator, and observes and records video states, so that the video is clear and smooth;
4) The broadband terminal principle prototype dials a call to the gateway station simulator and establishes communication to check whether the voice is clear or not, and the voice is clear and smooth;
5) The broadband terminal principle prototype uploads FTP text data to the gateway station simulator, and after the file uploading is completed, whether the file uploading is successful or not is checked, and the file uploading is successful;
6) A web server simulation terminal station is deployed at a gateway station to connect with the Internet, a user simulation terminal accesses a web page of the web server, whether the web page is smooth or not is observed and recorded, the web page access is successful, and the operation is smooth;
the satellite-ground integrated beam jumping key technology verification stage comprises the following steps:
step (1), a monitoring interface of a beam hopping modulation terminal sets a beam residence time ratio;
step (2), observing whether the signal is a continuous signal or not by using a real-time spectrometer at a beam-jumping simulation load inlet;
step (3), observing whether the signal is a burst signal or not by using a real-time spectrometer at a beam-jumping simulation load outlet;
step (4) observing the number of received frames of the demodulation terminal 1 and the demodulation terminal 2;
step (5) recording data;
for example, the steps of the key technology verification stage for satellite-ground integrated beam hopping are as follows:
1) The beam hopping modulator transmits continuous beam signals, and after the beam hopping simulation load, each simulation beam only observes burst signals;
2) The burst signal duration of each wave beam can be adjusted according to a preset scheme;
the Q/V link characteristic has the following steps to the verification stage of the system influence:
step (1) configuring a network manager to enable the system to work in an ACM mode;
step (2), firstly, a broadband terminal principle prototype is enabled to access the network with a higher signal-to-noise ratio, and the signal-to-noise ratio and the modulation mode of the terminal at the moment are checked;
step (3), the attenuation of the Q/V frequency band satellite-ground transmission channel simulator is regulated, so that the signal-to-noise ratio of the broadband terminal is reduced, and then the forward modulation mode of the broadband terminal principle model at the moment is checked;
continuously adjusting and reducing the signal to noise ratio, checking whether the modulation mode of the wideband terminal principle prototype is changed, and observing a change trend if the modulation mode is changed;
step (5) recording data;
for example, the steps of the key technology verification stage for satellite-ground integrated beam hopping are as follows:
1) The method is verified in a demonstration verification system, the Q/V frequency band channel characteristics are simulated by using a channel simulator, the terminal can reliably access the network and communicate, and the modulation coding mode is automatically adjusted when the link is in large fading;
2) Test results: under the Q/V channel characteristic, the ACM works reliably;
the mass terminal access management verification stage comprises the following steps:
step (1), connecting a gateway station principle prototype with a large-scale terminal simulator;
step (2) simulating 3000 terminals by using a large-scale terminal simulator based on the demonstration verification system environment;
step (3) executing a terminal network access process, and checking the network access state of the terminal through a network management system;
for example, the steps of the access management verification phase for mass terminals are as follows:
1) 5000 analog terminal stations are added on a network management interface, and the addition is successful;
2) Clicking a network access button of the analog terminal station, wherein the clicking is successful;
3) Checking a network management interface, judging whether the 5000 terminal station is successfully on line, and judging whether all 5000 terminal stations are successfully on line;
the digital transparent processing function verification stage comprises the following steps:
step (1), connecting a gateway station principle prototype, a gateway station simulator, a satellite channel simulator and a digital transparent processor principle prototype with a broadband terminal station principle prototype;
setting parameters such as a code modulation mode, a transmission rate, a receiving and transmitting frequency point and the like of a gateway station principle model machine and a gateway station simulator by using a network management system;
step (3) adjusting parameters such as bandwidth allocation, routing selection, sub-channel power and the like of the digital transparent processor principle model machine;
step (4) adjusting the parameters of the corresponding user terminal into parameters matched with the gateway station principle model machine and the simulator, observing whether the terminal can successfully access the network, and recording the transmission rate of the terminal;
for example, the digital transparent processing function verification phase steps are as follows:
1) Firstly, completing system resource adjustment test;
2) Then completing the network access test of the terminal;
3) Simulating unicast traffic. After the gateway station inputs signals from a group of sub-bands, 1 terminal outputs sub-band receiving signals from 1 group, and the unicast service is supported;
4) Simulating multicast service. After the gateway station inputs signals from one group of sub-bands, the plurality of terminals respectively receive signals from a plurality of groups of output sub-bands. Displaying the support multicast service;
before testing in all stages, the selection of the testing environment is completed, the use requirement of the testing instrument is clarified, and the appearance wiring inspection is carried out.
The test environment, ambient temperature: 10 ℃ -35 ℃ (indoor); relative humidity: 20% -80%; air pressure: standard atmospheric pressure;
the use requirement of the selected test instrument is qualified through the calibration of a measurement unit and is within the effective use period; the instrument with self-checking function needs to be self-calibrated before use; after all the test instruments are started and preheated to a specified time, the test is effective; all the test equipment accords with the safety regulations of the electric appliance; the test site must have good grounding;
the appearance wiring inspection is used for inspecting whether equipment is put on shelf according to the equipment list of the cabinet; checking whether wiring and bundling are consistent according to a system composition block diagram;
in the foregoing, only for the best specific implementation mode of the invention, the verification system and the verification method provided by the invention realize the verification system of the broadband satellite communication system based on the DVB-S2x/DVB-RCS2 protocol, can verify the service capabilities of a new generation of ultra-large capacity advanced communication system, gateway station centralized management and control, service splitting, satellite-ground integrated beam-jumping technology, Q/V link characteristics on system influence, mass terminal access management, digital transparent processing function and the like, and provide more comprehensive technical feasibility verification for subsequent engineering application.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (10)
1. A broadband satellite communication verification system, comprising: user segment, channel, space segment and ground segment;
a user segment, comprising: broadband terminal station principle model, large-scale terminal station simulator, beam hopping modulation terminal, beam hopping demodulation terminal and service simulator;
a channel, comprising: a satellite channel simulator;
a space segment comprising: on-board digital transparent processor principle prototype and beam jump analog load;
a ground section comprising: a network management system, a gateway station principle prototype and a gateway station simulator;
the broadband terminal station principle model machine is used for receiving and transmitting Ka frequency band signals, and carrying out power amplification, up-conversion and down-conversion on the Ka frequency band signals to complete modulation, demodulation, processing and forwarding of data;
the large-scale terminal station simulator is used for simulating a large number of user terminals and verifying a satellite communication test system supporting a super-large capacity broadband system;
the beam hopping modulation terminal is used for controlling framing, generating baseband data and modulating a beam hopping signal;
the beam hopping demodulation terminal is used for demodulating the beam hopping signal and finishing the frame decomposition and statistics of the signal;
the service simulator is used for generating a service data source and is used for the centralized management and control of the gateway station simulator and the gateway station principle model machine and the demonstration verification of service diversion;
the satellite channel simulator is used for simulating the Q/V frequency band transmission channel environment, receiving the terminal signals output by the station switching principle model machine, adding noise to the terminal signals and delaying transmission, and outputting the terminal signals to the large-scale terminal station simulator; meanwhile, receiving a terminal signal output by a large-scale terminal station simulator, adding noise to the signal, delaying transmission, and outputting the signal to a gateway station principle model machine;
the principle model of the on-board digital transparent processor supports information interaction and flexible cross-beam interaction between any frequency band and any bandwidth on the board, and is used for completing verification of a digital transparent processing technology;
the beam hopping simulation load receives the beam hopping signals and the signaling, and outputs the received beam hopping signals at a specific output port; combining the jumping beam demodulation terminal and the jumping beam modulation terminal to support the satellite-ground integrated jumping beam for demonstration and verification;
the network management system is used for uniformly managing and scheduling the satellite resources of the whole network, monitoring and managing all equipment in the satellite communication network, and controlling and distributing the resources of the terminal equipment;
the gateway station principle model machine is used for satellite resource management and distribution, baseband data processing, packaging, modulation, demodulation, error correction and satellite interface adaptation;
the gateway station simulator supports 3 beams, each beam is configured with a network segment, and each network segment supports 1 forward carrier and a return carrier with corresponding bandwidth;
the satellite channel simulator receives signals output by a station switching principle model machine, applies the distortion of multipath fading, doppler frequency shift, shadow fading and rain attenuation to the signals before adding noise and transmission delay to the signals, and outputs the signals to a user terminal; and receiving a signal output by the user terminal, applying the distortion of multipath fading, doppler frequency shift, shadow fading and rain fade to the signal before adding noise and transmission delay to the signal, and outputting the signal to a gateway station principle model machine.
2. A method of broadband satellite communication verification using the system of claim 1, comprising:
and (3) communication system verification: the terminal station principle model machine is utilized to realize the forward link broadband signal receiving and carry out UDP and TCP service transmission; realizing network access by using a terminal station principle model machine, and checking the network access state of the terminal in a network management system;
and (3) centralized management and control of gateway stations and service diversion verification: the network management is used for centralized management of a plurality of gateway station baseband equipment and terminals, the service is transmitted between the terminals of the same gateway station, the service is transmitted between the terminals of different gateway stations, and a service distribution mechanism is verified through a service transmission path and time delay;
satellite-ground integrated beam jumping verification: based on the hopping beam modulation terminal, the hopping beam simulation load and the hopping beam demodulation terminal, satellite-ground integrated hopping beam verification is realized;
Q/V link characteristics verify system impact: based on a Q/V channel simulator, a large-scale terminal station simulator, a network management system and a gateway station principle model machine, simulating self-adaptive high-order code modulation under a Q/V frequency band channel, and evaluating the influence of the system;
mass terminal access management verification: designing a testing environment under the scaling condition, using a broadband terminal station principle model machine and a large-scale terminal station simulator to realize mass terminal access simulation demonstration verification, simulating terminal accesses of different scenes, modeling through a terminal access management system, and verifying the capability of the system for supporting mass terminals;
digital transparent processing function verification: demonstration verification is carried out on the multi-bandwidth transformation capability of the digital transparent processor; meanwhile, demonstration verification is carried out on the flexible sub-channel power control capability of the digital transparent processor, and the power of each sub-channel is independently adjusted.
3. The broadband satellite communication authentication method according to claim 2, wherein the communication system authentication includes:
connecting a gateway station principle prototype with a satellite channel simulator and a broadband terminal station principle prototype;
the network management system is used for controlling the output symbol rate, the code modulation mode and the transmission rate of the gateway station principle model machine;
the parameters of a principle model machine of the broadband terminal station are adjusted to parameters matched with a gateway station simulator, whether the terminal can successfully access the network is observed, and the transmission rate of the terminal is recorded;
and based on the communication verification system environment, carrying out a terminal forward and return rate test, a rain failure resistance test, a terminal management and resource dynamic allocation capability test.
4. The method of claim 2, wherein the gateway station centralized management and service splitting verification comprises:
the method comprises the steps of building a gateway station principle model machine, a gateway station simulator, a satellite channel simulator and a network management system into a distributed gateway station structure;
the network management system is used for carrying out centralized deployment, and the network management system is used for carrying out demonstration of centralized management functions of the gateway station, including equipment management, state monitoring, alarm management and performance management, on the gateway station principle model machine and the gateway station simulator.
5. The method for verifying broadband satellite communication according to claim 2, wherein the satellite-to-ground integrated beam-jumping verification comprises:
the monitoring interface of the beam hopping modulation terminal sets the beam residence time proportion;
using a real-time spectrometer to observe whether the signal is a continuous signal at the entrance of the beam-jump simulation load;
using a real-time spectrometer to observe whether the signal is a burst signal at the outlet of the beam-jumping simulation load;
and observing the receiving frame number of the beam hopping demodulation terminal and recording data.
6. The method of claim 2, wherein the Q/V link characteristic verification of the system effect comprises:
configuring a network management system to enable a communication verification system to work in an ACM mode;
enabling a broadband terminal principle prototype to access to the network with a set signal-to-noise ratio, and checking the signal-to-noise ratio and the modulation mode of the terminal at the moment;
the attenuation of the Q/V frequency band satellite channel simulator is regulated, so that the signal-to-noise ratio of the broadband terminal is reduced, and then the forward modulation mode of the broadband terminal principle model machine at the moment is checked;
continuously adjusting and reducing the signal to noise ratio, checking whether the modulation mode of the broadband terminal principle prototype is changed, observing a change trend if the modulation mode is changed, and recording data.
7. The broadband satellite communication authentication method according to claim 2, wherein the mass terminal access management authentication comprises:
connecting a gateway station principle prototype with a large-scale terminal simulator;
simulating a terminal by using a large-scale terminal simulator based on the communication verification system environment;
executing the terminal network access flow, and checking the terminal network access state through the network management system.
8. A method of authenticating broadband satellite communications according to claim 2, wherein the digital transparent processing function authentication comprises:
connecting a gateway station principle model machine, a gateway station simulator, a satellite channel simulator and an on-board digital transparent processor principle model machine with a broadband terminal station principle model machine;
setting a code modulation mode, a transmission rate and a receiving and transmitting frequency point parameter of a gateway station principle model machine and a gateway station simulator by using a network management system;
adjusting bandwidth allocation, routing and sub-channel power parameters of a principle model machine of the on-board digital transparent processor;
and adjusting the parameters of the corresponding user terminal to parameters matched with the gateway station principle model machine and the gateway station simulator, observing whether the terminal can successfully access the network, and recording the transmission rate of the terminal.
9. The method of claim 4, wherein the gateway station schematic model and the gateway station simulator are connected to the 2 broadband terminal station schematic model at intermediate frequencies.
10. The method for verifying broadband satellite communication according to claim 9, wherein 2 broadband terminal station principle prototypes are simultaneously accessed to the same gateway station to perform terminal Internet access, voIP conversation and video demonstration, and terminal service distribution under the same gateway station is verified.
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