CN112152693A - Method and system for establishing communication link between ground terminal and low-orbit satellite - Google Patents
Method and system for establishing communication link between ground terminal and low-orbit satellite Download PDFInfo
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Abstract
The embodiment of the invention relates to a method and a system for establishing a communication link between a ground terminal and a low-earth-orbit satellite. A method of establishing a communication link between a ground terminal and a low earth orbit satellite, comprising: the wave control machine unit is used for acquiring satellite orbit information and platform position attitude information which are stored locally in advance, and calculating the beam direction required by the antenna according to the satellite orbit information and the platform position attitude information; the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit; the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit; and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and a system for establishing a communication link between a ground terminal and a low-earth-orbit satellite.
Background
The satellite communication system has the advantages of long transmission distance, wide coverage range, small interference, large capacity, high quality, flexible and various communication modes and the like. With the rapid development of global information and the breakthrough of rocket recovery technology in the future, the launching cost of high-throughput satellites and low-orbit satellites is greatly reduced, and the cost of satellite communication bandwidth is also obviously reduced. The internet formed by the space satellite networking can provide internet service for users on the ground and in the air. Therefore, a technical scheme for establishing a communication link between a ground terminal and a low earth orbit satellite is urgently needed at present, so that internet formed by space satellite networking can be used for providing internet access service for ground and air users.
Disclosure of Invention
In view of the above, to solve the above technical problems or some technical problems, embodiments of the present invention provide a method and a system for establishing a communication link between a ground terminal and a low earth orbit satellite.
In a first aspect, an embodiment of the present invention provides a method for establishing a communication link between a ground terminal and a low-earth satellite, where the method is applied to a system for establishing a communication link between a ground terminal and a low-earth satellite, and the system includes: the device comprises a wave control machine unit, an operation control unit, a liquid crystal driving unit and a liquid crystal regulation and control unit, and the method comprises the following steps:
the wave control machine unit is used for acquiring satellite orbit information and platform position attitude information which are stored locally in advance, and calculating the beam direction required by the antenna according to the satellite orbit information and the platform position attitude information;
the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit;
the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit;
and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite.
In one possible embodiment, the platform position and attitude information includes satellite, inertial navigation transmitted platform position and attitude information.
In one possible embodiment, the method further comprises:
processing a user terminal signal according to a preset first signal processing algorithm, and transmitting the processed signal to an antenna;
a power distribution network in the antenna transmits a user terminal signal to the liquid crystal regulation and control unit through a plurality of channels;
the liquid crystal regulation and control unit couples the user terminal signal to the antenna array for external radiation after changing the signal phases of different channels according to the driving voltage of the liquid crystal driving unit.
In one possible embodiment, the method further comprises:
the antenna array receives signals returned by the satellite, and the signals are synthesized in the power distribution network after the phases of the signals are adjusted by the liquid crystal adjusting and controlling unit;
and the signal is processed by a preset second signal processing algorithm and then transmitted to the user terminal.
In a possible embodiment, the processing the user terminal signal according to a preset signal processing algorithm, and transmitting the processed user terminal signal to the antenna, includes:
the user terminal signal is transmitted to the antenna after baseband processing, signal modulation, up-conversion and high-power amplifier.
In a possible embodiment, the transmitting to the ue after processing by the preset second signal processing algorithm includes:
the signal is transmitted to the user terminal after low noise amplification, down conversion, signal demodulation and baseband processing.
In a second aspect, an embodiment of the present invention provides a system for establishing a communication link between a ground terminal and a low-earth orbit satellite, where the system includes: the device comprises a wave control machine unit, an operation control unit, a liquid crystal driving unit and a liquid crystal regulating and controlling unit;
the wave control machine unit is used for acquiring satellite orbit information and platform position attitude information which are stored locally in advance, and calculating the beam direction required by the antenna according to the satellite orbit information and the platform position attitude information;
the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit;
the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit;
and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite.
In one possible embodiment, the platform position and attitude information includes satellite, inertial navigation transmitted platform position and attitude information.
In one possible embodiment, the system further comprises:
processing a user terminal signal according to a preset first signal processing algorithm, and transmitting the processed signal to an antenna;
a power distribution network in the antenna transmits a user terminal signal to the liquid crystal regulation and control unit through a plurality of channels;
the liquid crystal regulation and control unit couples the user terminal signal to the antenna array for external radiation after changing the signal phases of different channels according to the driving voltage of the liquid crystal driving unit.
In one possible embodiment, the system further comprises:
the antenna array receives signals returned by the satellite, and the signals are synthesized in the power distribution network after the phases of the signals are adjusted by the liquid crystal adjusting and controlling unit;
and the signal is processed by a preset second signal processing algorithm and then transmitted to the user terminal.
According to the technical scheme provided by the embodiment of the invention, a wave control machine unit acquires satellite orbit information and platform position attitude information which are locally pre-stored, and calculates the beam direction required by an antenna according to the satellite orbit information and the platform position attitude information; the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit; the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit; and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite. Therefore, by the technical scheme of the embodiment of the invention, the establishment of the communication link between the ground terminal and the low earth orbit satellite can be realized, the internet formed by the space satellite networking is convenient to follow, and the internet surfing service can be provided for ground and air users.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the embodiments of the present description, and for those skilled in the art, other drawings can be obtained according to the drawings
Fig. 1 is a schematic diagram of an overall architecture of a ground terminal system based on a liquid crystal electronic control scanning phased array antenna according to an embodiment of the present specification;
fig. 2 is a flowchart of an implementation of a method for establishing a communication link between a ground terminal and a low earth orbit satellite according to an embodiment of the present disclosure;
fig. 3 is a flowchart illustrating an implementation of a method for transmitting a signal from a user terminal to a target satellite according to an embodiment of the present disclosure;
fig. 4 is a flowchart illustrating an implementation of a method for receiving a satellite signal by a user terminal according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an lcd antenna structure according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the convenience of understanding of the embodiments of the present invention, the following description will be further explained with reference to specific embodiments, which are not to be construed as limiting the embodiments of the present invention.
Fig. 1 is a schematic diagram of an overall architecture of a ground terminal system based on a liquid crystal electrical steering scanning phased array antenna according to an embodiment of the present invention, which includes a system for establishing a communication link between a ground terminal and a low earth orbit satellite, and a user system. A system for establishing a communication link between a ground terminal and a low earth orbit satellite, comprising: the device comprises a wave control machine unit, an operation control unit, a liquid crystal driving unit and a liquid crystal regulating and controlling unit.
Based on the above system for establishing a communication link between a ground terminal and a low-earth orbit satellite, as shown in fig. 2, an implementation flowchart of a method for establishing a communication link between a ground terminal and a low-earth orbit satellite according to an embodiment of the present invention may specifically include the following steps:
s201, a wave control machine unit acquires satellite orbit information and platform position attitude information which are stored locally in advance, and calculates beam pointing required by an antenna according to the satellite orbit information and the platform position attitude information;
in the embodiment of the invention, the satellite orbit information and the platform position and attitude information are stored locally in the wave control machine unit in advance, and when a communication link between the ground terminal and the target satellite needs to be established, the satellite orbit information and the platform position and attitude information which are stored locally in advance are obtained. The platform position and attitude information includes satellite and inertial navigation transmitted platform position and attitude information, for example, the platform position and attitude information includes GPS (or beidou) and inertial navigation transmitted platform position and attitude information.
After the satellite orbit information and the platform position attitude information are obtained, the beam direction required by the antenna is calculated according to the satellite orbit information and the platform position attitude information, wherein the antenna is a liquid crystal antenna.
And transmitting the calculated beam direction required by the antenna to an operation control unit.
S202, the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit;
and for the calculated beam direction required by the antenna, the operation control unit extracts a phase calculation result in the required beam direction and calculates driving voltage information according to the phase calculation result.
And transmitting the driving voltage information obtained by the calculation to the liquid crystal driving unit.
S203, the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit;
and for the drive voltage information obtained by the calculation, the liquid crystal drive unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the drive voltage information so as to deflect the beam of the receiving antenna and receive the beacon signal transmitted by the satellite.
For the beacon signal described above, it is passed back to the wave controller unit.
And S204, the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite.
The wave control machine unit can comprise a beacon machine subunit, the beacon signals are sent to the beacon machine subunit and the wave control machine unit, the beam directions required by the antenna are repeatedly regulated and controlled through a preset algorithm, so that a target satellite is searched, and a communication link between the ground terminal and the target satellite is established.
After the above-mentioned communication link between the ground terminal and the target satellite is established, as shown in fig. 3, in the user system, an implementation flow diagram of a method for transmitting a signal from the user terminal to the target satellite according to an embodiment of the present invention is shown, where the method specifically includes the following steps:
s301, processing the user terminal signal according to a preset first signal processing algorithm, and transmitting the processed signal to an antenna;
in the embodiment of the present invention, a user terminal signal is processed according to a preset first signal processing algorithm, and is transmitted to an antenna after being processed, specifically:
the user terminal signal is transmitted to the antenna after baseband processing, signal modulation, up-conversion and high-power amplifier.
S302, a power distribution network in the antenna transmits a user terminal signal to a liquid crystal regulation and control unit through a plurality of channels;
and for the user terminal signal, the user terminal signal is transmitted to the antenna after being processed, and the power distribution network in the antenna transmits the user terminal signal to the liquid crystal regulation and control unit through a plurality of channels.
And S303, after the liquid crystal regulation and control unit changes the signal phases of different channels according to the driving voltage of the liquid crystal driving unit, coupling the user terminal signal to the antenna array for external radiation.
For the user terminal signal, after the liquid crystal regulation and control unit changes the signal phases of different channels according to the driving voltage of the liquid crystal driving unit, the user terminal signal is coupled to the antenna array to radiate outwards, so that the user terminal signal is transmitted to the target satellite.
As for the signal transmitting process described above, for signal receiving, the process is the reverse of the signal transmitting process, as shown in fig. 4, and is a schematic implementation flow diagram of the method for receiving satellite signals by a user terminal according to the embodiment of the present invention, the method may specifically include the following steps:
s401, the antenna array receives signals returned by a satellite, and the signals are synthesized in a power distribution network after the phases of the signals are adjusted by a liquid crystal adjusting and controlling unit;
and for the signal returned by the target satellite, the signal is received by the antenna array, and the phase of the signal is adjusted by the liquid crystal regulation and control unit and then synthesized in the power division network.
S402, the signal is processed by a preset second signal processing algorithm and then transmitted to the user terminal.
After the phase is adjusted by the liquid crystal regulation and control unit, the phase is synthesized in the power distribution network and is processed by a preset second signal processing algorithm and then transmitted to the user terminal, and the method specifically comprises the following steps:
the signal is transmitted to the user terminal after low noise amplification, down conversion, signal demodulation and baseband processing.
In the process of signal transmission and signal reception, a wave controller unit, an operation control unit and a liquid crystal driving unit are required to continuously calculate and change working parameters according to real-time data so as to realize beam scanning, change the beam direction of an antenna and keep the connection of a communication link between a ground terminal and a target satellite.
In addition, in the embodiment of the present invention, the antenna structure is briefly described, and as shown in fig. 5, the liquid crystal antenna includes: the power distribution/power synthesis network, the liquid crystal regulation and control unit and the antenna array.
The explanation is given by taking a transmitting antenna as an example: electromagnetic signals flow into each liquid crystal regulation and control unit through a power distribution network, the liquid crystal regulation and control units enable the amplitude and the phase of the signals to be correspondingly changed under the action of external bias signals, and the signals after amplitude and phase control respectively flow into each antenna unit on an antenna panel and are radiated to a free space to form specific wave beams.
The whole antenna takes a liquid crystal regulation and control unit as a core, and is of a multilayer structure due to the unique loading mode of liquid crystal, in order to fully utilize the processing technology of the existing liquid crystal display technology, the liquid crystal regulation and control unit comprises two layers of glass substrates and a layer of liquid crystal material, and a specific metal pattern is arranged on the glass substrates to realize the regulation and control of signals. As for other components of the antenna, the design may be different, and the embodiments of the present invention are not described in detail herein.
The liquid crystal regulation and control unit mainly functions to control the amplitude and the phase of the signal. The structure can adopt a transmission structure or a reflection structure, and the specific realization can refer to typical microwave transmission lines such as microstrip lines, coplanar waveguides, parallel double lines and the like, and the transmission lines are adaptively adjusted according to the processing technology of the liquid crystal display technology. The antenna array unit on the antenna panel can adopt a proper antenna structure to meet the requirements of the system on bandwidth, efficiency, polarization mode and directional diagram.
The liquid crystal antenna adopts a phase control system to realize electric scanning, and compared with the traditional passive phased array, the liquid crystal antenna is characterized in that a phase shifter designed by using a liquid crystal material replaces the traditional phase shifter. The liquid crystal phase shifter utilizes the anisotropic electromagnetic property of liquid crystal, and changes the dielectric constant of the liquid crystal by applying bias voltage so as to realize continuously controllable phase shift amount. The existing liquid crystal production line can be utilized for production, the cost is very low, and the method is beneficial to the civil market.
According to the technical scheme provided by the embodiment of the invention, a wave control machine unit acquires satellite orbit information and platform position attitude information which are locally pre-stored, and calculates the beam direction required by an antenna according to the satellite orbit information and the platform position attitude information; the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit; the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit; and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite. Therefore, by the technical scheme of the embodiment of the invention, the establishment of the communication link between the ground terminal and the low earth orbit satellite can be realized, the internet formed by the space satellite networking is convenient to follow, and the internet surfing service can be provided for ground and air users.
The embodiment of the invention also provides a system for establishing a communication link between the ground terminal and the low-earth orbit satellite, which comprises: the device comprises a wave control machine unit, an operation control unit, a liquid crystal driving unit and a liquid crystal regulating and controlling unit;
the wave control machine unit is used for acquiring satellite orbit information and platform position attitude information which are stored locally in advance, and calculating the beam direction required by the antenna according to the satellite orbit information and the platform position attitude information;
the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit;
the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit;
and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite.
The implementation process of the functions and actions of each module in the above device is specifically described in the implementation process of the corresponding step in the above method, and is not described herein again.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method for establishing a communication link between a ground terminal and a low-orbit satellite is applied to a system for establishing a communication link between a ground terminal and a low-orbit satellite, and the system comprises the following steps: the device comprises a wave control machine unit, an operation control unit, a liquid crystal driving unit and a liquid crystal regulation and control unit, and is characterized in that the method comprises the following steps:
the wave control machine unit is used for acquiring satellite orbit information and platform position attitude information which are stored locally in advance, and calculating the beam direction required by the antenna according to the satellite orbit information and the platform position attitude information;
the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit;
the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit;
and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite.
2. The method of claim 1, wherein the platform position attitude information comprises satellite, inertial navigation transmitted platform position attitude information.
3. The method of claim 1, further comprising:
processing a user terminal signal according to a preset first signal processing algorithm, and transmitting the processed signal to an antenna;
a power distribution network in the antenna transmits a user terminal signal to the liquid crystal regulation and control unit through a plurality of channels;
the liquid crystal regulation and control unit couples the user terminal signal to the antenna array for external radiation after changing the signal phases of different channels according to the driving voltage of the liquid crystal driving unit.
4. The method of claim 3, further comprising:
the antenna array receives signals returned by the satellite, and the signals are synthesized in the power distribution network after the phases of the signals are adjusted by the liquid crystal adjusting and controlling unit;
and the signal is processed by a preset second signal processing algorithm and then transmitted to the user terminal.
5. The method of claim 3, wherein the processing the user terminal signal according to a preset signal processing algorithm and transmitting the processed user terminal signal to the antenna comprises:
the user terminal signal is transmitted to the antenna after baseband processing, signal modulation, up-conversion and high-power amplifier.
6. The method of claim 4, wherein the processing by the preset second signal processing algorithm is transmitted to the ue, and the method comprises:
the signal is transmitted to the user terminal after low noise amplification, down conversion, signal demodulation and baseband processing.
7. A system for establishing a communication link between a ground terminal and a low earth orbit satellite, the system comprising: the device comprises a wave control machine unit, an operation control unit, a liquid crystal driving unit and a liquid crystal regulating and controlling unit;
the wave control machine unit is used for acquiring satellite orbit information and platform position attitude information which are stored locally in advance, and calculating the beam direction required by the antenna according to the satellite orbit information and the platform position attitude information;
the operation control unit calculates driving voltage information according to the required beam direction and transmits the driving voltage information to the liquid crystal driving unit;
the liquid crystal driving unit applies corresponding bias voltage to the liquid crystal regulation and control unit according to the driving voltage information so as to deflect the wave beam of the receiving antenna, receive the beacon signal transmitted by the satellite and transmit the beacon signal back to the wave control machine unit;
and the wave control machine unit repeatedly adjusts and controls the beam direction required by the antenna through a preset algorithm according to the beacon signal so as to search a target satellite and establish a communication link between the ground terminal and the target satellite.
8. The system of claim 7, wherein the platform position attitude information comprises satellite, inertial navigation transmitted platform position attitude information.
9. The system of claim 7, further comprising:
processing a user terminal signal according to a preset first signal processing algorithm, and transmitting the processed signal to an antenna;
a power distribution network in the antenna transmits a user terminal signal to the liquid crystal regulation and control unit through a plurality of channels;
the liquid crystal regulation and control unit couples the user terminal signal to the antenna array for external radiation after changing the signal phases of different channels according to the driving voltage of the liquid crystal driving unit.
10. The system of claim 9, further comprising:
the antenna array receives signals returned by the satellite, and the signals are synthesized in the power distribution network after the phases of the signals are adjusted by the liquid crystal adjusting and controlling unit;
and the signal is processed by a preset second signal processing algorithm and then transmitted to the user terminal.
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