CN215773120U - Multimode airborne satellite modulation and demodulation system - Google Patents
Multimode airborne satellite modulation and demodulation system Download PDFInfo
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Abstract
The application provides a multi-mode airborne satellite modulation and demodulation system, which comprises a monitoring control module, a plurality of intermediate frequency signal switching modules, a plurality of modems and a plurality of network switching modules, wherein the number of the modems and the number of the network switching modules are the same as that of the intermediate frequency signal switching modules; the monitoring control module is respectively connected with the intermediate frequency signal switching modules and is used for controlling the switch of each intermediate frequency signal switching module; each intermediate frequency signal switching module is respectively connected with a modem and a network switching module in sequence to form communication links, and each communication link is used for realizing communication with a satellite network; the plurality of intermediate frequency signal switching modules are sequentially connected to form a bypass channel, and the plurality of network switching modules are sequentially connected to form the bypass channel. The method and the device can switch to the proper modem according to the coverage conditions of different satellite networks in various regions, so that the aircraft can be accessed to the satellite network in the largest range, and the air-ground communication area of the aircraft is enlarged.
Description
Technical Field
The application relates to the technical field of satellite communication, in particular to a multi-mode airborne satellite modulation and demodulation system.
Background
In recent years, with the successful launching of a plurality of high-flux satellites and the construction of ground-air broadband networks, airborne broadband communication technology and aviation internet will be rapidly developed along with the installation of an airborne satellite communication system.
In the satellite air-ground communication of the airplane, the airborne satellite modem terminal can only access the satellite network matched with the ground master station terminal, so that the airborne satellite communication terminal A can only communicate with the satellite A, and the airborne satellite communication terminal B can only communicate with the satellite B, but cannot be used under other satellite networks. Due to the fact that flight routes are generally long and restrictions of policy and regulations of various countries, a plurality of satellite networks need to be crossed in the flight process, different satellite operators need to be accessed to achieve roaming, and at the moment, the existing airborne modem terminal cannot meet the requirements.
Disclosure of Invention
In view of the above, a primary objective of the present application is to provide a system for modem-on-board a satellite, which can switch to an appropriate modem according to coverage conditions of different satellite networks in various regions, so that an aircraft can access the satellite network to the largest extent, and an air-ground communication area of the aircraft is expanded.
In a first aspect, the present application provides a multimode airborne satellite modem system, which includes a monitoring control module, a plurality of intermediate frequency signal switching modules, and a plurality of modems and a plurality of network switching modules, the number of which is the same as that of the intermediate frequency signal switching modules;
the monitoring control module is respectively connected with the intermediate frequency signal switching modules and is used for controlling the switch of each intermediate frequency signal switching module;
each intermediate frequency signal switching module is respectively connected with a modem and a network switching module in sequence to form communication links, and each communication link is used for realizing communication with a satellite network;
the plurality of intermediate frequency signal switching modules are sequentially connected to form a bypass channel, and the plurality of network switching modules are sequentially connected to form the bypass channel.
According to the satellite network monitoring system, a plurality of modems can be configured in the system according to different satellite networks, each modem is connected with a network switching module and an intermediate frequency signal switching module respectively to form a communication link so as to realize communication with different satellite networks, then the satellite network which is required to be connected with the airplane at present is monitored through a monitoring control module, the matched modem is selected to start working according to the satellite network, and intermediate frequency signals output by the modems can be transmitted through a bypass channel formed by the intermediate frequency signal switching modules and transmitted to the satellite through a satellite antenna.
Optionally, the monitoring control module controls a power switch of the intermediate frequency signal switching module through a power discrete magnitude signal.
Specifically, the monitoring control module is configured to control, according to a satellite network to which the aircraft currently needs to be connected, an intermediate frequency signal switching module connected to a modem that is matched with the satellite network to be turned on, and control other intermediate frequency signal switching modules to be turned off.
The monitoring control module can control the power switch of each intermediate frequency signal switching module through the power discrete quantity, when one modem needs to be selected to work, the power of the intermediate frequency signal switching module connected with the modem can be controlled to be switched on, so that the modem starts to receive and transmit intermediate frequency signals, and meanwhile, the power of other intermediate frequency signal switching modules is controlled to be switched off.
Optionally, the network switching module transmits a data stream to the modem through an ethernet, and the modem modulates the data stream to generate an intermediate frequency signal, and transmits the intermediate frequency signal to the satellite network through the intermediate frequency signal switching module; or
The intermediate frequency signal switching module transmits an intermediate frequency signal to a modem through a radio frequency cable, and the modem demodulates the intermediate frequency signal to generate a data stream which is transmitted to the airplane equipment through the network switching module.
The communication link formed by the network exchange module, the modem and the intermediate frequency signal switching module can realize modulation and demodulation of the intermediate frequency signal, so that communication between the airplane and the satellite network is realized, and different modems can be matched with different satellite networks to realize modulation and demodulation of the intermediate frequency signal.
Optionally, the plurality of network switching modules are daisy-chained by ethernet.
Optionally, the plurality of intermediate frequency signal switching modules are daisy-chained by a radio frequency cable.
Therefore, the system can support daisy chain connection, so that the expansion of a plurality of communication links is realized, the modification is simple and convenient, the existing equipment is not required to be dismantled, and the cost is low.
Optionally, the intermediate frequency signal switching module includes a photoelectric conversion module.
From above, the intermediate frequency signal switching module can be realized through the photoelectric conversion module to realize the input and output of coaxial and optical fiber signals.
These and other aspects of the present application will be more readily apparent from the following description of the embodiment(s).
Drawings
Fig. 1 is a schematic diagram of a multi-mode airborne satellite modem system according to an embodiment of the present application;
fig. 2 is a flowchart of a handover method of an airborne satellite network according to an embodiment of the present application.
It should be understood that the dimensions and forms of the various blocks in the block diagrams described above are for reference only and should not be construed as exclusive of the embodiments of the present application. The relative positions and the inclusion relations among the blocks shown in the structural schematic diagram are only used for schematically representing the structural associations among the blocks, and do not limit the physical connection manner of the embodiment of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
The term "comprising" as used in the specification and claims should not be construed as being limited to the contents listed thereafter; it does not exclude other elements or steps. It should therefore be interpreted as specifying the presence of the stated features, integers, steps or components as referred to, but does not preclude the presence or addition of one or more other features, integers, steps or components, and groups thereof. Thus, the expression "an apparatus comprising the devices a and B" should not be limited to an apparatus consisting of only the components a and B.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment, but may. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments, as would be apparent to one of ordinary skill in the art from this disclosure.
The embodiments of the present application will be described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of a multimode on-board satellite modem system according to an embodiment of the present disclosure, where the multimode on-board satellite modem system may be an on-board communication system or an on-board communication terminal on an aircraft, or may be a partial device of the on-board communication system or the on-board communication terminal. The multi-mode airborne satellite modulation and demodulation system can be switched to a proper modem according to the coverage conditions of different satellite networks in various regions, so that the aircraft can be accessed to the satellite network to the maximum extent, and air-ground satellite communication is realized. As shown in fig. 1, the multi-mode airborne satellite modem system includes a monitoring control module 100, a plurality of if signal switching modules 201 and 203, a plurality of modems 301 and 303, and a plurality of network switching modules 401 and 403;
the monitoring control module 100 is respectively connected with the plurality of intermediate frequency signal switching modules 201 and 203 through control cables, the plurality of intermediate frequency signal switching modules 201 and 203 can be connected in daisy chain by adopting radio frequency cables and have a bypass channel function, namely, the plurality of intermediate frequency signal switching modules 201 and 203 can be mutually communicated to form a communication channel, one intermediate frequency signal switching module 203 is connected with a satellite antenna, other intermediate frequency signal switching modules 201 and 202 can communicate with the satellite antenna in a serial communication mode, meanwhile, each intermediate frequency signal switching module is sequentially connected with a modem and a network switching module to form a communication link, and each communication link can realize modulation or demodulation of different satellite signals according to the configuration of the modem. Specifically, the intermediate frequency signal switching module 201 is sequentially connected to the modem 301 and the network switching module 401, the intermediate frequency signal switching module 202 is sequentially connected to the modem 302 and the network switching module 402, and the intermediate frequency signal switching module 203 is sequentially connected to the modem 303 and the network switching module 403, wherein the intermediate frequency signal switching module is connected to the modem through a radio frequency cable, the modem is connected to the network switching module through an ethernet, the plurality of network switching modules 401 and 403 may also be connected in a daisy chain manner through an ethernet, one of the network switching modules 401 and 403 is connected to other equipment on the airplane for data interaction with the other equipment of the airplane, and the other network switching modules 402 and 403 may perform data interaction with the other equipment of the airplane through the network switching module 401.
In this embodiment, the intermediate frequency signal switching module may specifically adopt a photoelectric conversion module, and may implement input and output of coaxial and optical fiber signals. The multimode airborne satellite modulation and demodulation system realizes access to different satellite networks by configuring a plurality of modems, and enlarges the air-ground communication range of the airplane.
The monitoring control module 100 may obtain current geographic position information and flight route information of the aircraft through a positioning module, an aircraft bus, and other devices, formulate a satellite network switching map on the flight route according to the flight route information and satellite network coverage information on the flight route, and then determine a satellite network where the aircraft is currently located according to the current geographic position information of the aircraft, so as to preferably determine which modem should be selected to work, and transmit a control signal to each intermediate frequency signal switching module 201 and 203 through a control cable, where the control signal may specifically be a power discrete quantity control signal. Each of the intermediate frequency signal switching modules 201 and 203 can specifically control the signal to be turned on or off according to the power discrete quantity, so as to control the transmission switch of the intermediate frequency signal of the modems 301 and 303 connected thereto, so as to implement the signal transmission of the communication link formed by the intermediate frequency signal switching module 201, the modems 301 and the network switching module 401, or the signal transmission of the communication link formed by the intermediate frequency signal switching module 202, the modems 302 and the network switching module 402, or the signal transmission of the communication link formed by the intermediate frequency signal switching module 203, the modems 303 and the network switching module 403.
Specifically, when the modem 301 is judged to be working, the monitoring control module 100 controls the power switch of the intermediate frequency signal switching module 201 to be on through the discrete amount of power, and starts the transceiving intermediate frequency signal of the modem 301; the monitoring control module 100 controls a power switch of the intermediate frequency signal switching module 202 to be off through the discrete magnitude of the power supply, and the intermediate frequency signal switching module 202 and the intermediate frequency signal switching module 203 pass through a bypass channel of the radio frequency cable; the monitoring control module 100 controls a power switch of the intermediate frequency signal switching module 203 to be off through the discrete amount of the power supply, and the intermediate frequency signal switching module 203 and the satellite antenna pass through a bypass channel of the radio frequency cable;
then, the paths used for data signal transmission and transmission are: a network switching module 401, a modem 301, an intermediate frequency signal switching module 201, an intermediate frequency signal switching module 202(bypass), an intermediate frequency signal switching module 203(bypass), and a satellite antenna.
When the modem 302 is judged to work, the monitoring control module 100 controls the power switch of the intermediate frequency signal switching module 201 to be off through the discrete amount of power, and turns off the transceiving intermediate frequency signal of the modem 301; the monitoring control module 100 controls a power switch of the intermediate frequency signal switching module 302 to be on through the discrete magnitude of the power supply, and starts the receiving and transmitting intermediate frequency signal of the modem 1; the intermediate frequency signal switching module 202 and the intermediate frequency signal switching module 203 pass through a bypass channel of a radio frequency cable; the monitoring control module 100 controls a power switch of the intermediate frequency signal switching module 203 to be off through the discrete amount of the power supply, and the intermediate frequency signal switching module 203 and the satellite antenna pass through a bypass channel of the radio frequency cable;
then, the paths used for data signal reception and transmission are: network switching module 402-modem 302-if signal switching module 202-if signal switching module 203(bypass) -satellite antenna.
When the modem 303 is judged to work, the monitoring control module 100 controls the power switch of the intermediate frequency signal switching module 201 to be off through the discrete amount of the power supply, and turns off the transceiving intermediate frequency signal of the modem 301; the monitoring control module controls a power switch of the intermediate frequency signal switching module 202 to be off through the power discrete quantity, and closes the receiving and transmitting intermediate frequency signal of the modem 302; the monitoring control module 100 controls a power switch of the intermediate frequency signal switching module 203 to be on through the discrete magnitude of the power supply, and starts a transceiving intermediate frequency signal of the modem 303;
then, the paths used for data signal reception and transmission are: network switching module 403-modem 303-intermediate frequency signal switching module 203-satellite antenna.
Referring to fig. 1, the network switching module may transmit the data stream to a connected modem for modulation, and convert the data stream into an intermediate frequency signal for transmission to an intermediate frequency signal switching module connected thereto, where the intermediate frequency signal switching module may transmit the signal to the satellite antenna through the ethernet daisy chain communication link; similarly, the if signal may also transmit the if signal received by the if signal to a modem connected to the if signal for demodulation, and convert the if signal into a data stream to transmit to a network switching module connected to the if signal, and the network switching module may transmit the data stream through the ethernet daisy chain communication link to transmit to other devices on the aircraft.
In the multi-mode airborne satellite modem system in this embodiment, the network switching module, the modem, and the intermediate frequency signal switching module are all standardized designs, and the number thereof can be extended as required and support daisy chain cascade, for example, the monitoring control module 100, the intermediate frequency signal switching module 201, the modem 301, and the network switching module 401 can be combined into a main device, and the remaining intermediate frequency signal switching module, the modem, and the network switching module can be respectively matched to form a plurality of auxiliary devices, and the main device can support cascade connection with the plurality of auxiliary devices, and at the same time, when the system needs to be extended, only the auxiliary devices need to be correspondingly added, so that the aircraft can adapt to the plurality of satellite networks, and switch to a proper modem according to the satellite network where the aircraft is located, and simultaneously, the modification difficulty and modification time of the entire system are reduced.
Based on the multimode airborne satellite modem system shown in fig. 1, fig. 2 shows a method for switching an airborne satellite network according to an embodiment of the present application, which relies on the multimode airborne satellite modem system, and can automatically switch to a proper modem according to different satellite networks where an aircraft is currently located, so that the aircraft can access the satellite network to the largest extent, and air-ground satellite communication is realized. As shown in fig. 2, the method includes:
s10: acquiring flight route information of an airplane and satellite network coverage information on the flight route;
in this embodiment, a coverage map with multiple authorized satellite networks is built in the multimode airborne satellite modem system of the aircraft, flight route information can be acquired through a bus on the aircraft, the flight route can be segmented according to the multiple satellite networks through which the flight route passes and the coverage condition of the satellite networks, and the satellite network of the optimal communication of each segment of the flight route is determined.
S20: determining a satellite network switching point on the flight route according to the flight route information and the satellite network coverage information;
according to the coverage condition of the satellite network, generally, the coverage areas of two adjacent satellite networks can have an overlapping part, the coverage areas of the satellite networks can be regarded as circular coverage areas on the plane of a flight path, when the coverage areas of the two satellite networks have the overlapping part, a connecting line of two intersection points of the overlapping coverage areas can be a common chord of the overlapping coverage areas or a common chord of the two satellite networks, whether the flight path passes through the overlapping coverage areas of the two satellite networks or not is judged by judging whether the flight path and the common chord have the intersection point, and when the intersection point exists, whether the intersection point is a satellite network switching point or not can be determined according to the coverage information of the satellite network where the intersection point and the following flight path are located.
The intersection of the coverage areas of two adjacent satellite networks can be calculated by the following formula:
the position information of the coverage areas of the two satellite networks is respectively stored into a TABLE TABLE _ S and a TABLE TABLE _ D, wherein the TABLE _ S can be used as a source TABLE satellite network, the TABLE _ D can be used as a destination TABLE satellite network, and according to the radius of the earth as 6371KM, the coverage areas of the satellite networks of the two TABLEs are calculated by the formula to obtain two intersection points of the coverage areas of the two satellite networks, and a connecting line between the two intersection points can be used as a common chord of the coverage areas of the two satellite networks.
Dividing the flight route and the public string into a plurality of position points according to the Xkm (X range is 0.1-0.5) of particles respectively, acquiring the geographical position information (longitude, latitude and the like) of each position point, and judging whether the flight route and the public string have an intersection point according to whether the geographical position information of each position point of the flight route and each position point of the public string is the same or not. The division of the location points can be obtained by the following formula:
LONGn is the longitude of the nth point
LATin is latitude of nth point
Theta is the direction angle between 2 points, and X is the granularity of the distance
n is a multiple of granularity X of a connecting line of two intersection points
Dividing a connecting line between two intersection points of two satellite networks into a plurality of position points according to the formula and the granularity X, storing each position point into a TABLE TABLE _ C, dividing the flight route into a plurality of position points according to the formula and the granularity X, and storing each position point of the flight route and the satellite network corresponding to each position point into a TABLE TABLE _ D;
according to the position information of the position points of the TABLE TABLE _ C and the TABLE TABLE _ D, obtaining the intersection points of the TABLE TABLE _ C and the TABLE TABLE _ D, namely the intersection points of the flight path and the common chord, storing the intersection points into the TABLE TABLE _ E, and determining the satellite network switching points according to the number of the intersection points in the TABLE TABLE _ E;
when the flight route and the public chord do not have an intersection point, the flight route does not pass through an overlapping coverage area of two satellite networks, at the moment, the Equivalent omnidirectional radiation Power (EIRP) of each position point on the flight route in each satellite network can be directly judged, the two largest satellite networks are selected, the satellite network with the smaller time delay in the two satellite networks is used as the satellite network for the optimal communication, when the time delays are the same, the satellite network with the largest EIRP is used as the satellite network for the optimal communication, and therefore the satellite network for the optimal communication of each position point of the flight route can be determined, and when the aircraft passes through the position point, the aircraft is connected to the satellite network for the optimal communication;
when the flight route and the public chord have an intersection point, judging whether the position points of the flight route behind the intersection point belong to the coverage area of the same satellite network, if so, not using the intersection point as a satellite network switching point; if the satellite networks do not belong to the same satellite network, the intersection point is used as a satellite network switching point, the largest two satellite networks are selected through the EIRPs of the intersection point in each satellite network, the satellite networks with the smaller time delay in the two satellite networks are used as the satellite networks for optimal communication, and the satellite networks with the largest EIRP are used as the satellite networks for optimal communication when the time delays are the same, so that the satellite networks for optimal communication required to be switched by the satellite network switching point can be determined;
when the flight route and the public chord have two or more intersection points, judging whether the intersection point and the route between the adjacent next intersection point belong to the coverage area of the same satellite network, if the intersection point belongs to the same satellite network, the intersection point is not used as a satellite network switching point; if the satellite networks do not belong to the same satellite network, the intersection point is used as a satellite network switching point, the two largest satellite networks are selected through the EIRPs of the intersection point in each satellite network, the satellite networks with the smaller time delay in the two satellite networks are used as the satellite networks for the optimal communication, and the satellite networks with the largest EIRP are used as the satellite networks for the optimal communication when the time delays are the same, so that the satellite networks for the optimal communication required to be switched by the satellite network switching point can be determined.
S30: and selecting the satellite network with the optimal communication at each satellite network switching point for switching.
The method comprises the steps of determining a satellite network switching point on a flight route, forming a satellite network switching map of the flight route, acquiring the geographic position of an airplane in real time, switching according to a preset optimal communication satellite network when the airplane passes through the satellite network switching point, selecting a matched modem according to the optimal communication satellite network, sending power discrete quantity to an intermediate frequency signal switching module connected with the modem through a monitoring control module, enabling a power switch of the intermediate frequency signal switching module to be on, enabling the modem to modulate and demodulate intermediate frequency signals, and achieving data interaction between the airplane and the satellite network.
In this embodiment, the monitoring control module may be configured to be in a polling mode, and the specific polling time may be configured to be 3-10min, that is, each polling time of the monitoring control module may be one polling time, the above-mentioned switching method of the onboard satellite network may be sequentially performed, so that the aircraft may access the satellite network in the largest range, and may be switched to the matched modem in time according to the satellite network, thereby expanding the air-ground communication area of the aircraft.
It should be noted that the foregoing is only illustrative of the preferred embodiments of the present application and the technical principles employed. It will be understood by those skilled in the art that the present application is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the application. Therefore, although the present application has been described in more detail with reference to the above embodiments, the present application is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present application.
Claims (7)
1. The multimode airborne satellite modulation and demodulation system is characterized by comprising a monitoring control module, a plurality of intermediate frequency signal switching modules, a plurality of modems and a plurality of network switching modules, wherein the number of the modems and the number of the network switching modules are the same as that of the intermediate frequency signal switching modules;
the monitoring control module is respectively connected with the intermediate frequency signal switching modules and is used for controlling the switch of each intermediate frequency signal switching module;
each intermediate frequency signal switching module is respectively connected with a modem and a network switching module in sequence to form communication links, and each communication link is used for realizing communication with a satellite network;
the plurality of intermediate frequency signal switching modules are sequentially connected to form a bypass channel, and the plurality of network switching modules are sequentially connected to form the bypass channel.
2. The system of claim 1, wherein the monitoring control module controls a power switch of the intermediate frequency signal switching module through a power discrete quantity signal.
3. The system of claim 2, wherein the monitoring control module is configured to control, according to a satellite network to which the aircraft currently needs to be connected, an intermediate frequency signal switching module connected to a modem matching the satellite network to be turned on, and control other intermediate frequency signal switching modules to be turned off.
4. The system of claim 1, wherein the network switching module transmits the data stream to a modem via ethernet, and the modem modulates the data stream to generate an intermediate frequency signal, and transmits the intermediate frequency signal to the satellite network via the intermediate frequency signal switching module; or
The intermediate frequency signal switching module transmits an intermediate frequency signal to a modem through a radio frequency cable, and the modem demodulates the intermediate frequency signal to generate a data stream which is transmitted to the airplane equipment through the network switching module.
5. The system of claim 1, wherein the plurality of network switch modules are daisy-chained via ethernet.
6. The system of claim 1, wherein the plurality of intermediate frequency signal switching modules are daisy-chained by radio frequency cables.
7. The system of claim 1, wherein the intermediate frequency signal switching module comprises a photoelectric conversion module.
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