CN114679213A - Ka frequency band dual-mode airborne broadband satellite communication system - Google Patents
Ka frequency band dual-mode airborne broadband satellite communication system Download PDFInfo
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- CN114679213A CN114679213A CN202111278182.5A CN202111278182A CN114679213A CN 114679213 A CN114679213 A CN 114679213A CN 202111278182 A CN202111278182 A CN 202111278182A CN 114679213 A CN114679213 A CN 114679213A
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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
Abstract
The Ka-frequency-band dual-mode airborne broadband satellite communication system disclosed by the invention 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 a beam tracking satellite alignment process, acquires beams, locks a satellite, acquires forward channel information and return channel information, and completes antenna satellite capturing and satellite alignment; the airborne phased array antenna is matched with the 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 the access internet, and converts the IP data into intermediate frequency signals after framing, coding, modulation, encryption and protocol processing, and converts the intermediate frequency signals into Ka satellite radio frequency signals for transmission through a Ka up-conversion module arranged in the airborne phased array antenna housing; the modulation and demodulation 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 modulation and demodulation management unit to recover IP data streams, and sends the intermediate frequency signals to airborne users through a cabin wireless local area network to achieve communication service of the airborne Ka broadband satellite communication system.
Description
Technical Field
The invention relates to a Ka-band dual-mode airborne broadband satellite communication system, in particular to a Ka-band dual-mode civil aviation airborne broadband satellite communication system based on a flat-panel phased array technology.
Background
Satellite communication has many advantages such as mobility is strong, coverage is wide, transmission capacity is big, the reliability is high, network deployment is nimble, has become one of the important means of modern wireless communication. In the twenty-first century, the satellite communication industry has met a new round of innovation development and upgrading and has entered a new stage of systematization development and globalization service, and especially with the rapid development of the civil aviation field, the realization of air-to-ground broadband mobile interconnection with a height of ten thousand meters becomes an urgent need of the civil aviation market. The available spectrum resources for satellite communication are very limited, and higher frequencies are inevitably adopted for building a broadband network. In practice, satellite connections can be divided into the L-band, Ku-band and Ka-band, depending on the different band frequencies. The "Ka band" (also called 30/20 GHz band) is a part of the microwave band of the electromagnetic spectrum, and the frequency range is 26.5-40 GHz. Ka-band satellite communication is particularly suitable for requirements of broadband digital transmission, high-speed satellite communication and the like, and along with the increase of global connection requirements, many satellite communication systems increasingly adopt the Ka frequency band. The existing broadband satellite service basically uses the Ka frequency band, airborne broadband air-ground interconnection can be realized by utilizing the Ka frequency band broadband satellite communication, voice and large-flow data communication services are provided for airliners, internet access, electronic commerce, real-time television multimedia and other services are provided for passengers in airplane cabins, and the problem of 'island' of aviation information is solved. The Ka frequency band broadband satellite communication gradually becomes the development direction and market development top point of future broadband satellite communication by virtue of the advantages of high flux, wide coverage, low cost, small terminal and the like, satellite operators and equipment manufacturers all over the world start to accelerate the establishment of Ka frequency band broadband satellite communication service and the development pace of airborne broadband satellite communication systems in the field of civil aviation, and a planned broadband satellite communication network basically adopts the Ka frequency band and provides multimedia interactive services and broadcasting services through a synchronous orbit satellite, a non-static orbit satellite or a mixed satellite group system of the synchronous orbit satellite and the non-static orbit satellite.
At present, the internet technology on the machine mainly has two types: ground to air connection (ATG): the ground transmitting base station provides network signals; satellite connection: the satellite transmits data with a ground network. The ATG has advantages in that 1) 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 a 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 airplane refitting is lower. Although ATG has the above advantages, its disadvantages are not negligible, mainly as follows: 1) limited by frequency resources: the ATG generally uses the ground mobile communication frequency, and is difficult to obtain the larger frequency resource support of the management organization (as of 2019, china has not approved the ATG special frequency yet), while the foreign ATG system (Gogo ATG-4) is limited by the frequency resource, and the peak data speed of each flight is limited to 10 Mbps; 2) the coverage area is limited: in areas with few 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 routes; 3) the ground is relied on for building the network, which is not beneficial to fast propulsion; 4) the airplane is difficult to withdraw: because of the dependence on ATG networks of different countries, when the airplane is leased, if the purchaser has no ATG network in the country, the ATG equipment needs to be detached forcibly. In contrast, the airborne Ka broadband satellite communication system has a wider coverage range, can quickly realize the homeland coverage based on a domestic satellite, and can quickly realize the global coverage based on Inmarsat and other foreign satellites; along with the gradual global mainstream technical direction of Ka, most airlines also mainly push Ka broadband defense, which is beneficial to market promotion, and in addition, the airplane is easier to withdraw and resell. Therefore, in the era of Ka broadband interconnection, the airborne broadband satellite communication has been rapidly developed.
The airborne Ka broadband satellite communication system utilizes a Ka frequency band transmission channel of a geostationary orbit high-flux satellite to link a ground gateway station and ground communication network facilities through the airborne broadband satellite communication system arranged on the airplane, so that the intercommunication and interconnection of the airplane and the ground communication network are realized, and Internet access and other telecommunication value-added services are provided for passengers on the airplane.
With the development of global air interconnection technology, in order to meet the future market demands at home and abroad, an airborne broadband satellite communication system is inevitably 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 are mainly traditional mechanical antennas and variable inclination angle continuous section array antennas (VICTS), wherein the traditional mechanical antennas mainly rely on horizontal and vertical mechanical servo systems to realize accurate satellite alignment of the antennas, and the servo structure is high in height and needs to be provided with antenna fairings with large height; although the VICTS antenna does not adopt a mechanical mode on the vertical plane any more, the thickness of the antenna is reduced, the air flow characteristic is good, but the frequency range of the antenna is narrow, and the antenna needs to be continuously calibrated in the using process to adapt to frequency change. At present, the autonomous development of the domestic airborne Ka broadband satellite communication system is basically in a principle prototype stage, the system design structure is complex, and a system terminal only supports a single satellite mode and 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 has the defects of large volume, low scanning speed, poor satellite alignment precision, heavy weight and the like of the traditional mechanical antenna.
Disclosure of Invention
The invention aims to provide a Ka-band dual-mode airborne broadband satellite communication system which is wide in beam scanning range, high in satellite capturing speed, low in installation section, capable of improving the performance of the whole system and reducing cost, compatible with two different satellite communication networks and supporting mode switching and adopts a brand-new low-cost flat phased array antenna technology according to civil aviation airworthiness requirements and industrial standards.
The above object of the present invention can be achieved by the following technical solutions: a Ka band dual mode airborne broadband satellite communication system, comprising: fix the outside machine of cabin and carry the phased array antenna to and set up inside the cabin, the modem management unit and the machine that link to each other aircraft power supply carry the phased array antenna power supply unit, carry passenger cabin network server that communicates with modem management unit machine, its characterized in that: firstly, a modulation and demodulation management unit and an airborne phased array antenna link-building antenna control management unit perform information interaction and configuration software control beam tracking and satellite alignment processes with the modulation and demodulation management unit through an OpenAMIP protocol according to input parameters of an aircraft inertial navigation system, perform beam capturing according to satellite beam information, lock a satellite, acquire forward channel information and return channel information, and complete antenna satellite capturing and satellite alignment; secondly, the airborne phased array antenna is matched with a modulation-demodulation management unit to download the latest configuration software version from the satellite master station, CSC and SYNC channel connection is established with the master station according to frequency time slot planning issued by the master station, identity 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 airborne Ka broadband satellite communication system completes network access, a bidirectional communication link is established between the airborne Ka broadband satellite communication system and the ground station, and data transmission is performed according to allocated network resources; then, the modem management unit receives IP data which is accessed to the Internet or accessed to a cabin entertainment system in a Wi-Fi mode from airborne user wireless communication equipment through an airborne network server and a wireless access point which are integrated with functions of an application server, large-capacity storage, network management, route switching and the like, and after framing, coding, modulation, encryption and protocol processing, the IP data is converted into an intermediate frequency signal, the intermediate frequency signal is sent to a Ka up-conversion module arranged in an airborne phased-array antenna to be up-converted and power amplified, the intermediate frequency signal is converted into a Ka satellite radio-frequency signal, and the Ka satellite radio-frequency signal is sent to a satellite through a receiving and sending 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 antenna housing, 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 for decoding, demodulation, decryption and other processing to recover IP data streams, and sends the intermediate frequency signals to airborne users through a 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 onboard phased array antenna connected with the outside of the cabin, the modem management unit MODMAN connected with the onboard navigation system, the display control unit and the onboard cabin network server and the antenna power supply unit KPSU for supplying power to the onboard phased array antenna outside the cabin, and only comprises the modem management unit, the onboard antenna and the antenna power supply unit, thereby simplifying the system structure, greatly reducing the section height of the antenna, reducing the interconnection loss among functional modules, and meeting the dual-mode working requirements of the system on the working frequency band, EIRP, G/T, polarization mode, satellite tracking mode and other performances of the antenna The size is littleer, the reliability is higher, and the antenna need not to install under the radome, and the mounted position is comparatively nimble, in future use, antenna repacking and fuel economy will be promoted by a wide margin. Compare in traditional mechanical type antenna, overcome traditional mechanical type antenna and relied on level, perpendicular mechanical servo system to realize the accurate alignment star of antenna, servo structure height is great, needs the great antenna radome fairing's of mounting height defect.
According to the system, a Ka-band dual-mode airborne broadband satellite communication system is connected with an airborne cabin network server to provide an onboard Internet wireless access point, wireless communication equipment of an airborne user is accessed to the Internet or a cabin entertainment system in a WIFI (wireless fidelity) mode, a modulation-demodulation management unit modulates, codes, encrypts, processes protocols and the like received data signals, sends the data signals to a Ka up-conversion module of an airborne phased array antenna for up-conversion, converts intermediate-frequency signals into Ka broadband satellite radio-frequency signals through the up-conversion module and transmits the Ka broadband satellite radio-frequency signals to a satellite; meanwhile, the airborne phased array antenna converts the received downlink radio frequency signals of the Ka broadband satellite into intermediate frequency signals through the Ka down-conversion module, and the intermediate frequency signals are transmitted to the modulation and demodulation management unit to complete the demodulation, decoding, decryption and other processing of the signals. 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 state reporting of the receiving and transmitting antenna and realizing internal information interaction of the Ka broadband satellite communication system by connecting the Ethernet port with the modulation and demodulation management unit. The system has dual-mode working capacity, can be compatible with two satellite networks by adapting two satellite network systems through the system modulation and demodulation management unit, has an autonomous mode selection switching function, realizes mode switching by using a mode switching instruction with an antenna, and has wider communication coverage.
The invention cooperates with the airborne phased array antenna, download the latest configuration software version from the satellite main station, if not last time get on the star, determine the satellite network, directly enter the antenna to catch the star, to the star process, then according to the satellite beam information to catch the beam, lock the satellite, and obtain the forward channel and return channel information, finish the antenna to the star process, after successful to the star, Ka broadband satellite communication system and ground station set up the two-way communication link, enter the authentication process of network entry, authenticate, if authenticate successfully, distribute the corresponding network resource to carry on the data transmission, provide the communication service; and the interconnection and intercommunication of air and ground large data are realized. The 115V alternating current power supply on the aircraft and the 429 bus are connected with the inertial navigation and navigation satellite system on the aircraft to carry out trial flight verification, the real-time attitude and position information of the aircraft are obtained, the pointing direction of an airborne antenna of the system is adjusted in real time according to the flight attitude and the navigation satellite system information, and the real-time communication with the aircraft is realized. The uplink rate is not lower than 5Mbps, the downlink rate is not lower than 150Mbps, and the system has the application capability of VOIP telephone, WeChat characters/pictures, webpage browsing, online video, multi-party video conference and other functions. The measured uplink and downlink rates show that the airborne satellite communication system provided by the invention has the capacity of transmitting large data in the air and ground in real time.
The invention has the characteristics of light weight, low section, easy modification and the like, greatly lightens the weight and greatly reduces the pneumatic resistance compared with the traditional mechanical antenna satellite communication product, and can also be suitable for a future low-orbit satellite network. And tracking the satellite to realize the air-ground real-time interconnection.
Drawings
FIG. 1 is a block diagram of the Ka-band dual-mode airborne broadband satellite communication system according to the present invention;
FIG. 2 is a flowchart of the operation of FIG. 1;
fig. 3 is an operational state diagram of fig. 1.
Detailed Description
See fig. 1. In the exemplary preferred embodiment described below, a Ka band dual mode airborne broadband satellite communication system comprises: the system comprises an airborne phased array antenna fixed outside a cabin, a modulation and demodulation management unit and an airborne phased array antenna power supply unit which are arranged inside the cabin and connected with an airplane power supply, and a passenger cabin network server communicated with the modulation and demodulation management unit. Firstly, a modulation and demodulation management unit and an airborne phased array antenna are linked, an antenna control management unit performs information interaction and configuration software control beam tracking and satellite alignment processes with the modulation and demodulation management unit through an OpenAMIP protocol 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 backward channel information, and completes antenna satellite capturing and satellite alignment; secondly, the airborne phased array antenna is matched with a modulation-demodulation management unit to download the latest configuration software version from the satellite master station, CSC and SYNC channel connection is established with the master station according to frequency time slot planning issued by the master station, identity 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 airborne Ka broadband satellite communication system completes network access, a bidirectional communication link is established between the airborne Ka broadband satellite communication system and the ground station, and data transmission is performed according to allocated network resources; then, the modem management unit receives IP data which come from airborne user wireless communication equipment and access the Internet or access a cabin entertainment system in a Wi-Fi mode through an airborne network server and a wireless access point which integrate functions of an application server, large-capacity storage, network management, route switching and the like, and after framing, coding, modulation, encryption and protocol processing, the IP data are converted into intermediate frequency signals which are sent to a Ka up-conversion module arranged in an airborne phased-array antenna to be up-converted and power amplified, the intermediate frequency signals are converted into Ka satellite radio-frequency signals, and the Ka satellite radio-frequency signals are sent to a satellite through a receiving and sending 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 antenna housing, 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 processing such as decoding, demodulation and decryption to recover IP data streams, and sends the intermediate frequency signals to airborne users through a cabin wireless local area network, so that communication service of the airborne Ka broadband satellite communication system is achieved.
The airborne Ka broadband satellite communication system mainly comprises: the aircraft-mounted phased array antenna is located outside the cabin, an aircraft-mounted phased array antenna cover is built-in, an antenna control management module, a transmitting and receiving antenna, a Ka down-conversion module, a Ka up-conversion module and a power supply module connected with an antenna power supply unit inside the cabin, a modulation and demodulation management unit and the antenna power supply unit supply power through aircraft power supply alternating current, the antenna power supply unit comprises an AD/DC sub-circuit and a distribution control sub-circuit, alternating current provided by an aircraft power supply is converted into direct current, and power is supplied to other modules inside the aircraft-mounted phased array antenna through the built-in power supply module of the aircraft-mounted phased array antenna outside the cabin.
The modulation and demodulation 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 modulation and demodulation management unit to obtain state data of the antenna power supply unit KPSU; the discrete line interface is used for the modulation and demodulation management unit to carry out power-on enabling control on the antenna power supply unit.
The modulation and demodulation management unit is connected with a Ka up-conversion module, a Ka down-conversion module, an antenna control management unit, an airborne navigation system, a display control unit, an airborne passenger cabin network server, a passenger cabin entertainment system, a cockpit communication network and an antenna power supply unit connected with an airplane power supply for supplying power, the modulation and demodulation management unit MODMAN and the antenna power supply unit KPSU supply power through the airplane power supply in an alternating manner, wherein the MODMAN is converted into voltage required by the modulation and demodulation management unit for normal work through an internal power supply module; the antenna power supply unit directly converts airplane power supply alternating current into direct current required by normal work of the airborne phased array antenna, and power supply of each internal module is achieved through a power supply module arranged in the airborne phased array antenna housing.
The airborne cabin network server provides an internet wireless access point for the onboard modem management unit, and the wireless communication equipment of the airborne 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, beam tracking and state reporting of the receiving and transmitting antenna, and is connected with the modulation and demodulation management unit through the Ethernet port, so that information interaction between the modulation and demodulation management unit in the airborne Ka broadband satellite communication system and the airborne phased array antenna is realized.
The airborne phased array antenna sends the received downlink radio frequency signals of the Ka broadband satellite into a Ka down-conversion module through a receiving and sending antenna to be converted into intermediate frequency signals, the intermediate frequency signals are sent to a modulation and demodulation management unit to be demodulated, decoded and decrypted, IP data streams are recovered, and the IP data streams are sent to airborne users through a cabin wireless local area network; meanwhile, the modulation-demodulation management unit receives IP data from airborne user wireless communication equipment, completes framing, coding, modulation, encryption and protocol processing, converts the IP data into an intermediate frequency signal and 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-band dual-mode airborne broadband satellite communication system, an airborne phased-array antenna continuously sends current position information to a modulation and demodulation management unit based on an OpenAMIP protocol, the modulation and demodulation management unit continuously sends the position information to a ground master station through a return link, the ground master station monitors the position of the Ka-band dual-mode airborne broadband satellite communication system and sends a beam switching command to the airborne broadband satellite communication system according to actual needs, the system judges a beam switching mode after receiving the beam switching command, if the beam switching mode is intra-satellite beam switching, the system is switched to a target beam, and the satellite-to-satellite process is restarted; if the switching is the inter-satellite beam switching, the satellite network mode is reselected, and the satellite-to-satellite and network access processes are restarted.
See fig. 2. The method comprises the steps that a Ka frequency band dual-mode airborne broadband satellite communication system is powered on to enter an initialization process, stored 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 success, a basic parameter configuration process is entered, if failure occurs, failure warning information is prompted, a satellite network mode of service is selected according to airplane position information or recently stored beam information after success is configured, and a satellite network mode selection process is entered; in the process of selecting the satellite network mode, a modulation-demodulation management unit judges whether the satellite network is started for the first time, if so, parameter configuration software is installed for on-line upgrading, otherwise, the satellite network is successfully accessed and registered through an off-board airborne antenna for satellite capturing and satellite alignment, and whether the access is successful is judged, if so, satellite communication service is provided, then, a beam switching mode is judged, if the beam switching mode is intra-satellite beam switching, the satellite network is switched to the antenna for satellite capturing, and the satellite alignment process is restarted; and if the switching is the inter-satellite beam switching, the satellite network mode is reselected, and the satellite-to-satellite and network access process is restarted.
The method comprises the steps that a modulation and demodulation management unit determines a satellite network, if the satellite network is used for first satellite getting, initial installation parameter configuration in a satellite mode is carried out on the modulation and demodulation management unit, an airborne phased array antenna is matched with the modulation and demodulation management unit, a latest configuration software version is downloaded from a satellite main station, if the satellite network is not used for first satellite getting, the satellite network is determined, the satellite capturing and satellite aiming processes are directly carried out, then wave beam capturing is carried out according to satellite wave beam information, a satellite is locked, forward channel information and backward channel information are obtained, the satellite aiming process of the antenna is completed, after the satellite aiming is successful, an access authentication process is started, identity authentication is needed, if the authentication is successful, the access is successfully carried out, 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 the onboard Ka broadband satellite communication system is powered on, the method includes: 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-test, system state recording and indication, satellite network mode selection and the like are completed, and the initialization is completed and the exit is completed;
When the initialization is completed or the maintenance state exits, the airplane enters a preparation state, the functions of detecting the service condition of the system, recording and indicating the system state, monitoring the continuous state and the like are completed, and the airplane logs in a maintenance account on the ground or exits the maintenance account when having the service condition or entering the maintenance state.
The preparation state of the airborne Ka broadband satellite communication system meets the network access condition, enters the network access state when the communication link is interrupted or the wave beam is switched, completes the functions of satellite searching, satellite alignment, network access registration, system service condition detection, system state recording and indication, continuous state monitoring and the like, exits when the network access is successful or the maintenance state is entered, returns to the preparation state if the network access condition is not met, and enters the maintenance state if the network access condition is met by the airplane on the ground/logging in a maintenance account; and when the network access is successful, the network enters a service state, 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, a communication link is interrupted or the beam is switched, and the network exits when the network enters a maintenance state. The airplane 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, self-checking starting, log query, system state recording and the like, and the airplane exits when the system software loading is completed/exits the maintenance mode or is restarted.
Having thus described the embodiments of the present invention in detail, those skilled in the art will appreciate that various modifications and adaptations of the embodiments can be made without departing from the spirit and scope of the present invention. The present patent claims encompass such modifications and variations.
Claims (10)
1. A Ka band dual mode airborne broadband satellite communication system, comprising: fix the outside machine of cabin and carry the phased array antenna to and set up inside the cabin, the modem management unit and the machine that link to each other aircraft power supply carry the phased array antenna power supply unit, carry passenger cabin network server that communicates with modem management unit machine, its characterized in that: firstly, a modulation and demodulation management unit and an airborne phased array antenna are linked, an antenna control management unit performs information interaction and configuration software control beam tracking and satellite alignment processes with the modulation and demodulation management unit through an OpenAMIP protocol 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 backward channel information, and completes antenna satellite capturing and satellite alignment; secondly, the airborne phased array antenna is matched with a modulation-demodulation management unit to download the latest configuration software version from the satellite master station, CSC and SYNC channel connection is established with the master station according to frequency time slot planning issued by the master station, identity 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 airborne Ka broadband satellite communication system completes network access, a bidirectional communication link is established between the airborne Ka broadband satellite communication system and the ground station, and data transmission is performed according to allocated network resources; then, the modem management unit receives IP data which come from airborne user wireless communication equipment and access the Internet or access a cabin entertainment system in a Wi-Fi mode through an airborne network server and a wireless access point which integrate functions of an application server, large-capacity storage, network management, route switching and the like, and after framing, coding, modulation, encryption and protocol processing, the IP data are converted into intermediate frequency signals which are sent to a Ka up-conversion module arranged in an airborne phased-array antenna to be up-converted and power amplified, the intermediate frequency signals are converted into Ka satellite radio-frequency signals, and the Ka satellite radio-frequency signals are sent to a satellite through a receiving and sending 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 antenna housing, 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 processing such as decoding, demodulation and decryption to recover IP data streams, and sends the intermediate frequency signals to airborne users through a cabin wireless local area network, so that communication service of the airborne Ka broadband satellite communication system is achieved.
2. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: the airborne Ka broadband satellite communication system comprises: the aircraft-mounted phased array antenna is located outside a cabin, an antenna control management module arranged in an aircraft-mounted phased array antenna housing, a transceiving antenna, a Ka down-conversion module, a Ka up-conversion module and a power supply module connected with an antenna power supply unit inside the cabin, a modulation and demodulation management unit and the antenna power supply unit are powered by aircraft power supply alternating current, the antenna power supply unit comprises an AD/DC sub-circuit and a distribution control sub-circuit, alternating current provided by an aircraft power supply is converted into direct current, and power is supplied to other modules inside the aircraft-mounted phased array antenna through a built-in power supply module of the aircraft-mounted phased array antenna outside the cabin.
3. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: the modulation and demodulation 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 modulation and demodulation management unit to acquire state data of the antenna power supply unit KPSU; the discrete line interface is used for the modulation and demodulation management unit to carry out power-on enabling control on the antenna power supply unit.
4. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: the modulation and demodulation management unit is connected with a Ka up-conversion module, a Ka down-conversion module, an antenna control management unit, an airborne navigation system, a display control unit, an airborne passenger cabin network server, a passenger cabin entertainment system, a cockpit communication network and an antenna power supply unit connected with an aircraft power supply for supplying power, the modulation and demodulation management unit MODMAN and the antenna power supply unit KPSU are supplied with power through the aircraft power supply in an alternating current manner, wherein the MODMAN is converted into voltage required by the normal work of the modulation and demodulation management unit through an internal power supply module; the antenna power supply unit directly converts airplane power supply alternating current into direct current required by normal work of the airborne phased array antenna, and power supply of each internal module is achieved through a power supply module arranged in the airborne phased array antenna housing.
5. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: the onboard cabin network server provides an internet wireless access point for the onboard modem management unit, and the wireless communication equipment of the onboard user accesses the internet or the cabin entertainment system in a WIFI mode.
6. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: the antenna control management unit is an independent component unit in the antenna, controls software, beam tracking and state reporting of a receiving and transmitting antenna, is connected with the modulation and demodulation management unit through an Ethernet port, realizes information interaction between the modulation and demodulation management unit in the airborne Ka broadband satellite communication system and the airborne phased array antenna, and sends a received downlink radio frequency signal of the Ka broadband satellite into a Ka down-conversion module through the receiving and transmitting antenna to be converted into an intermediate frequency signal, and the intermediate frequency signal is sent to the modulation and demodulation management unit to complete signal demodulation, decoding and decryption, recover an IP data stream and send the IP data stream to an airborne user through a cabin wireless local area network; meanwhile, the modulation-demodulation management unit receives IP data from airborne user wireless communication equipment, completes framing, coding, modulation, encryption and protocol processing, converts the IP data into an intermediate frequency signal and 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 airborne broadband satellite communication system of claim 1, wherein: in the operation process of the Ka-band dual-mode airborne broadband satellite communication system, an airborne phased-array antenna continuously sends current position information to a modulation and demodulation management unit based on an OpenAMIP protocol, the modulation and demodulation management unit continuously sends the position information to a ground master station through a return link, the ground master station monitors the position of the Ka-band dual-mode airborne broadband satellite communication system and sends a beam switching command to the airborne broadband satellite communication system according to actual needs, the system judges a beam switching mode after receiving the beam switching command, if the beam switching mode is intra-satellite beam switching, the system is switched to a target beam, and the satellite-to-satellite process is restarted; and if the switching is the inter-satellite beam switching, the satellite network mode is reselected, and the satellite-to-satellite and network access process is restarted.
8. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: the method comprises the steps that a Ka frequency band dual-mode airborne broadband satellite communication system is powered on to enter an initialization process, stored 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 success, a basic parameter configuration process is entered, if failure occurs, failure warning information is prompted, a satellite network mode of service is selected according to airplane position information or recently stored beam information after success is configured, and a satellite network mode selection process is entered; in the process of selecting the satellite network mode, a modulation-demodulation management unit judges whether the satellite network is started for the first time, if so, parameter configuration software is installed for on-line upgrading, otherwise, the satellite network is successfully accessed and registered through an off-board airborne antenna for satellite capturing and satellite alignment, and whether the access is successful is judged, if so, satellite communication service is provided, then, a beam switching mode is judged, if the beam switching mode is intra-satellite beam switching, the satellite network is switched to the antenna for satellite capturing, and the satellite alignment process is restarted; if the switching is the inter-satellite beam switching, the satellite network mode is reselected, and the satellite-to-satellite and network access processes are restarted.
9. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: the method comprises the steps that a modulation and demodulation management unit determines a satellite network, if the satellite network is used for first satellite getting, initial installation parameter configuration in a satellite mode is carried out on the modulation and demodulation management unit, an airborne phased array antenna is matched with the modulation and demodulation management unit, a latest configuration software version is downloaded from a satellite main station, if the satellite network is not used for first satellite getting, the satellite network is determined, the satellite capturing and satellite aiming processes are directly carried out, then wave beam capturing is carried out according to satellite wave beam information, a satellite is locked, forward channel information and backward channel information are obtained, the satellite aiming process of the antenna is completed, after the satellite aiming is successful, an access authentication process is started, identity authentication is needed, if the authentication is successful, the access is successfully carried out, 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.
10. The Ka band dual mode airborne broadband satellite communication system of claim 1, wherein: after the onboard Ka broadband satellite communication system is powered on, the onboard Ka broadband satellite communication system enters 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-check, system state recording and indication, satellite network mode selection and the like are completed, and the initialization is completed for exiting; when the initialization is completed or the maintenance state exits, the airplane enters a preparation state, the functions of detecting the service condition of the system, recording and indicating the system state, monitoring the continuous state and the like are completed, and the airplane logs in a maintenance account on the ground or exits the maintenance account when having the service condition or entering the maintenance state.
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