CN114679213B - Ka frequency band double-mode airborne broadband satellite communication system - Google Patents
Ka frequency band double-mode airborne broadband satellite communication system Download PDFInfo
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- CN114679213B CN114679213B CN202111278182.5A CN202111278182A CN114679213B CN 114679213 B CN114679213 B CN 114679213B CN 202111278182 A CN202111278182 A CN 202111278182A CN 114679213 B CN114679213 B CN 114679213B
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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
- H04B7/18502—Airborne stations
- H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
- H04B7/18508—Communications with or from aircraft, i.e. aeronautical mobile service with satellite system used as relay, i.e. aeronautical mobile satellite service
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/48—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for in-vehicle communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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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
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Abstract
The invention discloses a Ka frequency band double-mode airborne broadband satellite communication system, which has the advantages of wide beam scanning range and high satellite capturing speed, and is realized by the following technical scheme: the antenna control management unit performs information interaction with the modulation and demodulation management unit according to the input parameters of the aircraft inertial navigation system, controls the beam tracking satellite alignment process, beam capturing, satellite locking, and obtains the forward channel and return channel information to complete the antenna satellite capturing and satellite alignment; the method comprises the steps that an airborne phased array antenna is matched with a modulation and demodulation management unit to establish channel connection with a master station to complete network access, the modulation and demodulation management unit receives IP data from an access internet to perform framing, coding, modulation, encryption and protocol processing, converts the IP data into an intermediate frequency signal, and converts the intermediate frequency signal into a Ka satellite radio frequency signal to be transmitted through a Ka up-conversion module built in an airborne phased array antenna housing; the modem management unit receives downlink Ka satellite radio frequency signals, converts the downlink Ka satellite radio frequency signals into intermediate frequency signals through a Ka down-conversion module arranged in the airborne phased array antenna housing, sends the intermediate frequency signals to the modem management unit to recover IP data streams, and sends the intermediate frequency signals to an airborne user through a cabin wireless local area network to realize communication service of an airborne Ka broadband satellite communication system.
Description
Technical Field
The invention relates to a Ka frequency band dual-mode airborne broadband satellite communication system, in particular to a Ka frequency band dual-mode civil aviation airborne broadband satellite communication system based on a flat-plate phased array technology.
Background
Satellite communication has the advantages of strong mobility, wide coverage, large transmission capacity, high reliability, flexible networking and the like, and has become one of the important means of modern wireless communication. The satellite communication industry is in the twenty-first century, new innovations, development, upgrading and upgrading are carried out, new stages of systematic development and globalization service are carried out, and particularly, with the rapid development of the civil aviation field, the universal high-altitude air-ground broadband mobile interconnection is realized, so that the urgent demands of the civil aviation market are met. The available spectrum resources for satellite communications are limited and higher frequencies must be used to build a broadband network. In practice, satellite connections can be divided into L-band, ku-band and Ka-band according to different band frequencies. The Ka band, also called 30/20 GHz band, is a part of the microwave band of the electromagnetic spectrum and has a frequency range of 26.5-40GHz. The Ka-band satellite communication is particularly suitable for the requirements of broadband digital transmission, high-speed satellite communication and the like, and along with the increase of global connection requirements, a plurality of satellite communication systems increasingly adopt the Ka frequency band. The current broadband satellite service basically uses the Ka frequency band, and can realize airborne broadband air-ground interconnection by using the Ka frequency band broadband satellite communication, thereby providing voice and large-flow data communication service for airlines, providing services such as surfing the Internet, electronic commerce, real-time television multimedia and the like for passengers in an aircraft cabin and solving the island problem of aviation information. The Ka-band broadband satellite communication gradually becomes the development direction and market high point of future broadband satellite communication by virtue of the advantages of high throughput, wide coverage, low cost, small terminal and the like, satellite operators and equipment manufacturers in all the world have begun to accelerate the development steps of building Ka-band broadband satellite communication services and developing the airborne broadband satellite communication system in the civil aviation field, and the planned broadband satellite communication network basically adopts the Ka-band and provides multimedia interactive service and broadcasting service through a synchronous orbit satellite, a non-stationary orbit satellite or a mixed satellite swarm system of the synchronous orbit satellite and the non-stationary orbit satellite.
At present, on-board internet technologies mainly have two kinds: ground-to-air connection (ATG): the ground transmitting base station provides a network signal; satellite connection: the satellite performs data transmission with the ground network. The advantage of ATG is that 1) the communication delay is low: the ATG is accessed to a network through a ground base station, and the communication distance is far lower than that of a satellite; 2) The theoretical capacity is large: by adopting the ground mobile communication technology, the coverage area of a single base station is generally smaller than the single beam range of a satellite, and the communication capacity is larger on the premise of ensuring frequency resources; 3) The cost of refitting the aircraft is lower. Although ATG has the above advantages, the disadvantages are more not neglected, and are mainly as follows: 1) Limited by frequency resources: the ATG generally uses the ground mobile communication frequency, so that the larger frequency resource support of the management mechanism is difficult to obtain (by 2019, china does not approve the special frequency of the ATG yet), and the peak data speed of each flight is limited to 10Mbps after the foreign ATG system (Gogo ATG-4) is limited by the frequency resource; 2) Coverage area is limited: in areas with fewer network towers, such as large-area deserts, or remote areas such as oceans and the like, the network towers cannot be built, so that the network towers cannot be used on transoceanic airlines; 3) Depending on the ground to build a net, the rapid propulsion is not facilitated; 4) The aircraft is difficult to refund: because of the dependence on the ATG networks of different countries, the aircraft needs to be forced to disassemble the ATG equipment if the buyer is in the country without the ATG network when the aircraft is rented. In contrast, the coverage range of the onboard Ka broadband satellite communication is wider, the domestic earth coverage can be rapidly realized based on domestic satellites, and the global coverage can be rapidly realized based on foreign satellites such as Inmarsat; along with the gradual becoming the global mainstream technical direction of Ka, most airlines also mainly push Ka broadband guard, which is favorable for market popularization, and in addition, the renting and resale of the aircraft are easier. Therefore, in the Ka broadband interconnection era, the development of airborne broadband defense is rapid.
The on-board Ka broadband satellite communication system utilizes a Ka frequency band transmission channel of a geostationary orbit high-flux satellite, and links a ground gateway station and a ground communication network facility through the on-board broadband satellite communication system arranged on an airplane, so that the intercommunication and interconnection of the airplane and the ground communication network are realized, and the Internet access and other telecom value-added services are provided for passengers on the airplane.
With the development of global air interconnection technology, in order to meet the future domestic and foreign market demands, the airborne broadband satellite communication system is also necessarily required to have multi-mode working capability, and most of the currently reported existing products are in a single working mode. In addition, the antennas of the existing civil aviation airborne broadband satellite communication system mainly comprise a traditional mechanical antenna and a variable-inclination angle continuous section array antenna (VICTS), wherein the traditional mechanical antenna mainly realizes accurate satellite alignment of the antennas by means of a horizontal and vertical mechanical servo system, and the servo structure is large in height and needs to be provided with an antenna fairing with a large height; although the VICTS antenna does not adopt a mechanical mode in a vertical plane, the thickness of the antenna is reduced, the airflow characteristic is good, but the frequency range of the antenna is narrow, and the antenna needs to be continuously calibrated to adapt to frequency change in the use process. At present, autonomous development of a domestic airborne Ka broadband satellite communication system is basically in a principle model machine stage, the system design structure is complex, and a system terminal only supports a single satellite mode, so that the system terminal is difficult to adapt to the future domestic and foreign market demands; the system antenna mostly adopts the traditional communication-in-motion mechanical antenna, and the system antenna has the defects of large volume, low scanning speed, poor satellite accuracy, heavy weight and the like, which are the weaknesses of the traditional mechanical antenna.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the Ka frequency band dual-mode airborne broadband satellite communication system which has the advantages of wide beam scanning range, high satellite capturing speed, low installation section, capability of improving the performance of the whole system, cost reduction, compatibility with two different satellite communication networks, mode switching support and adoption of a brand-new low-cost flat-plate phased array antenna technology according to the civil aviation airworthiness requirement and the industry standard.
The above object of the present invention can be achieved by the following technical solutions: a Ka band dual mode on-board broadband satellite communication system comprising: fix at the outside airborne phased array antenna in cabin to and set up in the cabin inside, the modem management unit and the airborne phased array antenna power supply unit of continuous aircraft power, carry out the passenger cabin network server of communication with modem management unit machine, its characterized in that: firstly, a modulation and demodulation management unit and an onboard phased array antenna chain-building antenna control management unit perform information interaction and configure software to control a beam tracking satellite-alignment process according to an aircraft inertial navigation system input parameter, perform beam capturing according to satellite beam information, lock a satellite, acquire forward channel information and return channel information, and finish antenna satellite capturing and satellite alignment; secondly, the onboard phased array antenna is matched with a modulation and demodulation management unit, the latest configuration software version is downloaded from a satellite master station, CSC and SYNC channel connection is established with the master station according to the frequency slot planning issued by the master station, authentication and authentication with the master station are completed by using an authentication rule which is coordinated with the master station in advance, if authentication is successful, the onboard Ka broadband satellite communication system completes network access, a bidirectional communication link is established between the onboard Ka broadband satellite communication system and a ground station, and data transmission is performed according to the allocated network resources; then, the modem management unit receives IP data accessed to the Internet or a cabin entertainment system from an onboard user wireless communication device in a Wi-Fi mode through an onboard network server and a wireless access point which integrate functions of an application server, a large-capacity storage, network management, route switching and the like, performs framing, coding, modulation, encryption and protocol processing, converts the IP data into an intermediate frequency signal, sends the intermediate frequency signal to a Ka up-conversion module built in an onboard phased array antenna for up-conversion and power amplification, converts the intermediate frequency signal into a Ka satellite radio frequency signal, and sends the Ka satellite radio frequency signal to a satellite through a transceiver antenna; the receiving and transmitting antenna receives downlink Ka satellite radio frequency signals, sends the downlink Ka satellite radio frequency signals to the Ka down-conversion module arranged in the airborne phased array radome, converts the Ka satellite radio frequency signals into intermediate frequency signals after down-conversion and low-noise amplification, sends the intermediate frequency signals to the modulation and demodulation management unit to perform decoding, demodulation, decryption and other processes to recover IP data streams, and sends the IP data streams to airborne users through the cabin wireless local area network to realize communication service of the airborne Ka broadband satellite communication system.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the airborne phased array antenna outside the connected cabin, the modem management unit MODMAN of the airborne navigation system, the display control unit and the airborne cabin network server and the antenna power supply unit KPSU for supplying power to the airborne phased array antenna outside the cabin are connected, the system structure is simplified, the section height of the antenna is greatly reduced, the interconnection loss among all functional modules is reduced, the performances of the working frequency band, EIRP, G/T, polarization mode, satellite tracking mode and the like of the antenna meet the system dual-mode working requirements, the dual-mode antenna is favorable for improving the performance of the whole system, and has the advantages of wide beam scanning range, high satellite capturing speed and the like. Compared with the traditional mechanical antenna, the defect that the traditional mechanical antenna realizes accurate satellite alignment of the antenna by means of a horizontal mechanical servo system and a vertical mechanical servo system, the servo structure is large in height, and an antenna fairing with large installation height is required is overcome.
The invention adopts a Ka frequency band double-mode airborne broadband satellite communication system to connect an airborne cabin network server, an on-board Internet wireless access point is provided, wireless communication equipment of an airborne user is accessed to the Internet or cabin entertainment system in a WIFI mode, a modulation and demodulation management unit modulates, codes, encrypts, processes protocols and the like on received data signals, sends the data signals to a Ka up-conversion module of an airborne phased array antenna to carry out up-conversion, and converts an intermediate frequency signal into a Ka broadband satellite radio frequency signal through the up-conversion module and transmits the Ka broadband satellite radio frequency signal to a satellite; meanwhile, the airborne phased array antenna converts the received downlink radio frequency signal of the Ka broadband satellite into an intermediate frequency signal through the Ka down-conversion module, and transmits the intermediate frequency signal to the modulation and demodulation management unit to finish the processing of demodulation, decoding, decryption and the like of the signal. The control management module of the phased array antenna is an independent component unit in the antenna and is used for realizing software control, beam tracking and status reporting of the receiving and transmitting antenna, and the control management module is connected with the modulation and demodulation management unit through an Ethernet port to realize internal information interaction of the Ka broadband satellite communication system. The system has dual-mode working capacity, is compatible with two satellite networks by adapting two satellite network systems through the system modulation and demodulation management unit, has an autonomous mode switching function, realizes mode switching by using a mode switching instruction of an antenna, and has wider communication coverage.
The invention cooperates with the airborne phased array antenna, downloads the latest configuration software version from the satellite main station, if it is not the first time staring, then determines the satellite network, directly enters the antenna staring and staring process, then captures the wave beam according to the wave beam information of the satellite, locks the satellite, and obtains the forward channel and return channel information, completes the antenna staring process, after the staring is successful, the Ka broadband satellite communication system and the ground station establish a bidirectional communication link, enter the network authentication process, authenticate, if the authentication is successful, allocate the corresponding network resource for data transmission, and provide communication service; and the interconnection and intercommunication of the air-ground big data are realized. The on-board 115V alternating current power supply and 429 bus are connected with the on-board inertial navigation and navigation satellite system to carry out test flight verification, the real-time attitude and position information of the airplane are obtained, and the pointing direction of an on-board antenna of the system is adjusted in real time according to the flying attitude and the navigation satellite system information, so that the on-board real-time communication is realized. The uplink speed is not lower than 5Mbps, the downlink speed is not lower than 150Mbps, and the system has the application capability of the functions of VOIP telephone, weChat text/picture, web browsing, online video, multiparty video conference and the like. The actual measured uplink and downlink rates show that the airborne satellite communication system provided by the invention has the capacity of real-time transmission of air-ground big data.
Compared with the traditional mechanical antenna satellite product, the invention has the characteristics of light weight, low section, easy modification and the like, greatly reduces the weight and aerodynamic drag, and is also suitable for a future low-orbit satellite network. And tracking satellites to realize space-to-ground real-time interconnection.
Drawings
FIG. 1 is a block diagram of a Ka-band dual-mode airborne broadband satellite communication system of the present invention;
FIG. 2 is a flowchart of the operation of FIG. 1;
fig. 3 is a view of the operation of fig. 1.
Detailed Description
See fig. 1. In the exemplary preferred embodiments described below, a Ka band dual mode on-board broadband satellite communication system includes: the system comprises an airborne phased array antenna fixed outside a cabin, a modem management unit and an airborne phased array antenna power supply unit which are arranged inside the cabin and connected with an aircraft power supply, and a passenger cabin network server in communication with the modem management unit. Firstly, a modulation and demodulation management unit and an onboard phased array antenna are linked, an antenna control management unit performs information interaction and configures software to control a beam tracking satellite alignment process according to an OpenAMIP protocol and the modulation and demodulation management unit according to input parameters of an aircraft inertial navigation system, performs beam capturing according to satellite beam information, locks a satellite, acquires forward channel information and return channel information, and completes antenna satellite capturing and satellite alignment; secondly, the onboard phased array antenna is matched with a modulation and demodulation management unit, the latest configuration software version is downloaded from a satellite master station, CSC and SYNC channel connection is established with the master station according to the frequency slot planning issued by the master station, authentication and authentication with the master station are completed by using an authentication rule which is coordinated with the master station in advance, if authentication is successful, the onboard Ka broadband satellite communication system completes network access, a bidirectional communication link is established between the onboard Ka broadband satellite communication system and a ground station, and data transmission is performed according to the allocated network resources; then, the modem management unit receives IP data from the wireless communication equipment of the airborne user, which is accessed to the Internet or the cabin entertainment system in a Wi-Fi mode through an airborne network server and a wireless access point which integrate the functions of an application server, a large-capacity storage, network management, route exchange and the like, processes framing, coding, modulation, encryption and protocol, converts the data into an intermediate frequency signal, sends the intermediate frequency signal to a Ka up-conversion module which is arranged in an airborne phased array antenna for up-conversion and power amplification, converts the signal into a Ka satellite radio frequency signal, and sends the Ka satellite radio frequency signal to a satellite through a transceiver antenna; the receiving and transmitting antenna receives downlink Ka satellite radio frequency signals, sends the downlink Ka satellite radio frequency signals to the Ka down-conversion module arranged in the airborne phased array radome, converts the Ka satellite radio frequency signals into intermediate frequency signals after down-conversion and low-noise amplification, sends the intermediate frequency signals to the modulation and demodulation management unit, decodes, demodulates, decrypts and the like to recover IP data streams, and sends the IP data streams to airborne users through the cabin wireless local area network to realize communication service of the airborne Ka broadband satellite communication system.
The on-board Ka broadband satellite communication system mainly comprises: the system comprises an airborne phased array antenna positioned outside a cabin, an antenna control management module, a transceiver antenna, a Ka down-conversion module, a Ka up-conversion module and a power module connected with an antenna power supply unit inside the cabin, wherein the modem management unit and the antenna power supply unit are powered by an aircraft power supply in an alternating current manner, the antenna power supply unit comprises an AD/DC sub-circuit and a distribution control sub-circuit, alternating current provided by the aircraft power supply is converted into direct current, and the power module is used for powering other modules inside the aircraft through the built-in power module of the airborne phased array antenna outside the cabin.
The modem management unit is connected with the antenna power supply unit through a 422 bus interface and a discrete line interface, wherein the 422 bus interface is used for the modem management unit to acquire the state data of the KPSU of the antenna power supply unit; the discrete line interface is used for the modem management unit to power on the antenna power supply unit for enabling control.
The modem management unit is connected with the Ka up-conversion module, the Ka down-conversion module, the antenna control management unit, the airborne navigation system, the display control unit, the airborne cabin network server, the cabin entertainment system, the cockpit communication network and the antenna power supply unit connected with the aircraft power supply for supplying power, and the modem management unit MODMN and the antenna power supply unit KPSU supply power through the aircraft power supply for alternating current, wherein the MODMN is converted into voltage required by the normal operation of the modem management unit through the internal power supply module; the antenna power supply unit directly converts the aircraft power alternating current into direct current required by normal operation of the airborne phased array antenna, and power supply of each module inside is realized through a power module built in the airborne phased array antenna housing.
The on-board cabin network server provides an Internet wireless access point for the on-board modem management unit, and the wireless communication equipment of the on-board user is accessed to the Internet or the cabin entertainment system in a WIFI mode.
The antenna control management unit is an independent component unit in the antenna, controls software of the transceiver antenna, beam tracking and status reporting, and is connected with the modulation and demodulation management unit through an Ethernet port to realize information interaction between the modulation and demodulation management unit in the airborne Ka broadband satellite communication system and the airborne phased array antenna.
The machine-mounted phased array antenna sends the received downlink radio frequency signal of the Ka broadband satellite to the Ka down-conversion module through the receiving and transmitting antenna to be converted into an intermediate frequency signal, the intermediate frequency signal is sent to the modulation and demodulation management unit to complete demodulation, decoding and decryption of the signal, an IP data stream is recovered, and the IP data stream is sent to a machine-mounted user through the cabin wireless local area network; meanwhile, the modulation and demodulation management unit receives IP data from the wireless communication equipment of the airborne user, completes framing, coding, modulation, encryption and protocol processing, converts the IP data into an intermediate frequency signal, sends the intermediate frequency signal to the Ka up-conversion module, and the up-conversion module converts the intermediate frequency signal into a Ka broadband satellite radio frequency signal, and transmits the Ka broadband satellite radio frequency signal to a satellite through a transmitting antenna.
In the operation process of the Ka frequency band double-mode airborne broadband satellite communication system, the airborne phased array antenna continuously transmits current position information to the modulation and demodulation management unit based on an OpenAMIP protocol, the modulation and demodulation management unit continuously transmits the position information to the ground master station through a return link, the ground master station monitors the position of the Ka frequency band double-mode airborne broadband satellite communication system and transmits a beam switching command to the airborne broadband satellite communication system according to actual needs, after the system receives the beam switching command, the beam switching mode is judged, if the beam switching mode is in-satellite beam switching, the beam is switched to a target beam, and the satellite flow is restarted; if the beam is switched between the satellites, the satellite network mode is selected again, and the satellite-to-satellite network flow is restarted.
See fig. 2. The Ka frequency band dual-mode airborne broadband satellite communication system is powered on to enter an initialization process, storage data inspection and power-on self-inspection of the Ka broadband satellite communication system are completed, basic parameter configuration is carried out according to stored system parameters after the Ka broadband satellite communication system is successful, a basic parameter configuration process is entered, if the Ka frequency band dual-mode airborne broadband satellite communication system fails, failure alarm information is prompted, a satellite network mode of service is selected according to airplane position information or recently stored wave beam information after the Ka frequency band dual-mode airborne broadband satellite communication system is successfully configured, and a satellite network mode selection process is entered; in the satellite network mode selection process, the modulation and demodulation management unit judges whether a satellite network stars for the first time, if yes, the parameter configuration software is installed to upgrade online, otherwise, satellite logging registration is successfully carried out through an off-board airborne antenna, if yes, satellite communication service is provided, and then a beam switching mode is judged, if yes, the satellite is switched to an antenna to catch the satellite, and the satellite logging process is restarted; if the beam is switched between the satellites, the satellite network mode is selected again, and the satellite-to-satellite network flow is restarted.
The modulation and demodulation management unit determines a satellite network, if the satellite network is the first satellite, the modulation and demodulation management unit performs initial installation parameter configuration in a satellite mode, the airborne phased array antenna is matched with the modulation and demodulation management unit, the latest configuration software version is downloaded from a satellite main station, if the satellite network is not the first satellite, the satellite network is determined to be good, the satellite network directly enters an antenna satellite capturing and satellite aligning process, then the satellite is captured according to satellite beam information, the satellite is locked, and the forward channel and return channel information are acquired, the antenna satellite aligning process is completed, after the satellite aligning process is successful, the network access authentication process is started, identity authentication is required, if the authentication is successful, the network access is successful, a bidirectional communication link is established between an airborne Ka broadband satellite communication system and a ground station, corresponding network resources are allocated for data transmission, and communication services are provided.
See fig. 3. In an alternative embodiment, after powering up the on-board Ka broadband satellite communication system, the method comprises: the system comprises an initialization state, a preparation state, a network access state, a service state and a maintenance state, wherein 5 working states are respectively the functions of each state and the permission of entering/exiting; the initialization state is powered on and restarted, the system is started to enter the initialization state, the functions of system software and hardware initialization, system parameter loading and configuration, power-on self-checking, system state recording and indication, satellite network mode selection and the like are completed, and the initialization is completed to exit;
when the initialization is finished or the maintenance state is exited, the aircraft enters a preparation state, and the functions of system service condition detection, system state recording and indication, continuous state monitoring and the like are finished, and the aircraft exits the maintenance account when the aircraft has service conditions or enters the maintenance state on the ground/logs in the maintenance account.
The preparation state of the airborne Ka broadband satellite communication system meets the network access condition, enters the network access state when the network access condition is met or a communication link is interrupted or a wave beam is switched, the functions of searching for stars, registering network access, detecting the service condition of the system, recording and indicating the system state, continuously monitoring the state and the like are completed, the network access is successful or the system state exits when the maintenance state is entered, if the network access condition is not met, the system returns to the preparation state, and if the network access condition is met, the aircraft logs in a maintenance account on the ground and enters the maintenance state; the network access is successful, the service state is entered, the functions of IP data communication, power control, beam switching, system service condition detection, system state recording and indication, continuous state monitoring and the like are completed, the communication link is interrupted or the beam switching is carried out, and the network access is exited when the network access is carried out to the maintenance state. The aircraft enters a maintenance state when entering a maintenance mode on the ground/logging in a maintenance account, and completes the functions of parameter configuration, system software loading, starting self-checking, log inquiry, system state recording and the like, and the system software loading is completed/exits the maintenance mode or exits when restarting.
While the embodiments of the present invention have been described in detail, those skilled in the art, having the benefit of this disclosure, may make various changes and modifications to the embodiments without departing from the spirit and scope of the invention. The patent claims of the present invention contain such modifications and variations.
Claims (8)
1. A Ka band dual mode on-board broadband satellite communication system comprising: fix at the outside airborne phased array antenna in cabin to and set up in the cabin inside, the modem management unit and the airborne phased array antenna power supply unit of continuous aircraft power, carry out the passenger cabin network server of communication with modem management unit machine, its characterized in that: firstly, a modulation and demodulation management unit and an onboard phased array antenna are linked, an antenna control management unit performs information interaction and configures software to control a beam tracking satellite alignment process according to an OpenAMIP protocol and the modulation and demodulation management unit according to input parameters of an aircraft inertial navigation system, performs beam capturing according to satellite beam information, locks a satellite, acquires forward channel information and return channel information, and completes antenna satellite capturing and satellite alignment; secondly, the onboard phased array antenna is matched with a modulation and demodulation management unit, the latest configuration software version is downloaded from a satellite master station, CSC and SYNC channel connection is established with the master station according to the frequency slot planning issued by the master station, authentication and authentication with the master station are completed by using an authentication rule which is coordinated with the master station in advance, if authentication is successful, the onboard Ka broadband satellite communication system completes network access, a bidirectional communication link is established between the onboard Ka broadband satellite communication system and a ground station, and data transmission is performed according to the allocated network resources; then, the modem management unit receives IP data from the wireless communication equipment of the airborne user, which is accessed to the Internet or the cabin entertainment system in a Wi-Fi mode through an airborne network server and a wireless access point which integrate the functions of an application server, a large-capacity storage, network management, route exchange and the like, processes framing, coding, modulation, encryption and protocol, converts the data into an intermediate frequency signal, sends the intermediate frequency signal to a Ka up-conversion module which is arranged in an airborne phased array antenna for up-conversion and power amplification, converts the signal into a Ka satellite radio frequency signal, and sends the Ka satellite radio frequency signal to a satellite through a transceiver antenna; the receiving and transmitting antenna receives downlink Ka satellite radio frequency signals, sends the downlink Ka satellite radio frequency signals to a Ka down-conversion module arranged in the airborne phased array radome, converts the Ka satellite radio frequency signals into intermediate frequency signals after down-conversion and low-noise amplification, sends the intermediate frequency signals to the modulation and demodulation management unit, carries out decoding, demodulation, decryption and other processes to recover IP data streams, and sends the IP data streams to an airborne user through the cabin wireless local area network to realize communication service of an airborne Ka broadband satellite communication system;
in the operation process of the Ka frequency band double-mode airborne broadband satellite communication system, the airborne phased array antenna continuously transmits current position information to the modulation and demodulation management unit based on an OpenAMIP protocol, the modulation and demodulation management unit continuously transmits the position information to the ground master station through a return link, the ground master station monitors the position of the Ka frequency band double-mode airborne broadband satellite communication system and transmits a beam switching command to the airborne broadband satellite communication system according to actual needs, after the system receives the beam switching command, the beam switching mode is judged, if the beam switching mode is in-satellite beam switching, the beam is switched to a target beam, and the satellite flow is restarted; if the beam switching is between satellites, the satellite network mode is reselected, and the satellite-to-satellite network flow is restarted;
the Ka frequency band dual-mode airborne broadband satellite communication system is powered on to enter an initialization process, storage data inspection and power-on self-inspection of the Ka broadband satellite communication system are completed, basic parameter configuration is carried out according to stored system parameters after the Ka broadband satellite communication system is successful, a basic parameter configuration process is entered, if the Ka frequency band dual-mode airborne broadband satellite communication system fails, failure alarm information is prompted, a satellite network mode of service is selected according to airplane position information or recently stored wave beam information after the Ka frequency band dual-mode airborne broadband satellite communication system is successfully configured, and a satellite network mode selection process is entered; in the satellite network mode selection process, the modulation and demodulation management unit judges whether a satellite network stars for the first time, if yes, the parameter configuration software is installed to upgrade online, otherwise, satellite logging registration is successfully carried out through an off-board airborne antenna, if yes, satellite communication service is provided, and then a beam switching mode is judged, if yes, the satellite is switched to an antenna to catch the satellite, and the satellite logging process is restarted; if the beam is switched between the satellites, the satellite network mode is selected again, and the satellite-to-satellite network flow is restarted.
2. The Ka-band dual-mode on-board broadband satellite communication system according to claim 1, wherein: onboard Ka broadband
The satellite communication system includes: the system comprises an airborne phased array antenna positioned outside a cabin, an antenna control management module, a transceiver antenna, a Ka down-conversion module, a Ka up-conversion module and a power module connected with an antenna power supply unit inside the cabin, wherein the modem management unit and the antenna power supply unit are powered by an aircraft power supply in an alternating mode, the antenna power supply unit comprises an AD/DC sub-circuit and a distribution control sub-circuit, alternating current provided by the aircraft power supply is converted into direct current, and the power module is used for powering other modules inside the aircraft through the built-in power module of the airborne phased array antenna outside the cabin.
3. The Ka-band dual-mode on-board broadband satellite communication system according to claim 1, wherein: the modem management unit is connected with the antenna power supply unit through a 422 bus interface and a discrete line interface, wherein the 422 bus interface is used for the modem management unit to acquire the state data of the KPSU of the antenna power supply unit; the discrete line interface is used for the modem management unit to power on the antenna power supply unit for enabling control.
4. The Ka-band dual-mode on-board broadband satellite communication system according to claim 1, wherein: the modem management unit is connected with the Ka up-conversion module, the Ka down-conversion module, the antenna control management unit, the airborne navigation system, the display control unit, the airborne cabin network server, the cabin entertainment system, the cockpit communication network and the antenna power supply unit connected with the aircraft power supply for supplying power, and the modem management unit MODMN and the antenna power supply unit KPSU supply power through the aircraft power supply for alternating current, wherein the MODMN is converted into voltage required by the normal operation of the modem management unit through the internal power supply module; the antenna power supply unit directly converts the aircraft power alternating current into direct current required by normal operation of the airborne phased array antenna, and power supply of each module inside is realized through a power module built in the airborne phased array antenna housing.
5. The Ka-band dual-mode on-board broadband satellite communication system according to claim 1, wherein: the on-board cabin network server provides an Internet wireless access point for the on-board modem management unit, and the wireless communication equipment of the on-board user is accessed to the Internet or the cabin entertainment system in a WIFI mode.
6. The Ka-band dual-mode on-board broadband satellite communication system according to claim 1, wherein: the antenna control management unit is an independent component unit in the antenna, controls software of a transceiver antenna, beam tracking and status reporting, is connected with the modem management unit through an Ethernet port, realizes information interaction between the modem management unit in the airborne Ka broadband satellite communication system and the airborne phased array antenna, sends a received downlink radio frequency signal of the Ka broadband satellite to the Ka down-conversion module through the transceiver antenna to be converted into an intermediate frequency signal, sends the intermediate frequency signal to the modem management unit to complete demodulation, decoding and decryption of the signal, recovers an IP data stream, and sends the IP data stream to an airborne user through a cabin wireless local area network; meanwhile, the modulation and demodulation management unit receives IP data from the wireless communication equipment of the airborne user, completes framing, coding, modulation, encryption and protocol processing, converts the IP data into an intermediate frequency signal, sends the intermediate frequency signal to the Ka up-conversion module, and the up-conversion module converts the intermediate frequency signal into a Ka broadband satellite radio frequency signal, and transmits the Ka broadband satellite radio frequency signal to a satellite through a transmitting antenna.
7. The Ka-band dual-mode on-board broadband satellite communication system according to claim 1, wherein: the modulation and demodulation management unit determines a satellite network, if the satellite network is the first satellite, the modulation and demodulation management unit performs initial installation parameter configuration in a satellite mode, the airborne phased array antenna is matched with the modulation and demodulation management unit, the latest configuration software version is downloaded from a satellite main station, if the satellite network is not the first satellite, the satellite network is determined to be good, the satellite network directly enters an antenna satellite capturing and satellite aligning process, then beam capturing is performed according to satellite beam information, a satellite is locked, and forward channel and return channel information are acquired, the antenna satellite aligning process is completed, after the satellite aligning process is successful, the network access authentication process is started, identity authentication is required, if the authentication is successful, the network access is successful, a bidirectional communication link is established between an airborne Ka broadband satellite communication system and a ground station, corresponding network resources are allocated for data transmission, and communication services are provided.
8. The Ka-band dual-mode on-board broadband satellite communication system according to claim 1, wherein: after the onboard Ka broadband satellite communication system is powered on, the system enters an initialization state, a preparation state, a network access state, a service state and a maintenance state, 5 working states are respectively the functions of each state and the permission of entering/exiting, the initialization state is powered on and restarted, the system is started to enter the initialization state, the functions of system software and hardware initialization, system parameter loading and configuration, power-on self-checking, system state recording and indication, satellite network mode selection and the like are completed, and the initialization is completed; when the initialization is finished or the maintenance state is exited, the aircraft enters a preparation state, and the functions of system service condition detection, system state recording and indication, continuous state monitoring and the like are finished, and the aircraft exits the maintenance account when the aircraft has service conditions or enters the maintenance state on the ground/logs in the maintenance account.
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