CN113328791B - Satellite communication device and satellite communication method - Google Patents
Satellite communication device and satellite communication method Download PDFInfo
- Publication number
- CN113328791B CN113328791B CN202110741307.7A CN202110741307A CN113328791B CN 113328791 B CN113328791 B CN 113328791B CN 202110741307 A CN202110741307 A CN 202110741307A CN 113328791 B CN113328791 B CN 113328791B
- Authority
- CN
- China
- Prior art keywords
- communication
- mode
- satellite
- unit
- communication unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18513—Transmission in a satellite or space-based system
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
- H04B7/18519—Operations control, administration or maintenance
Abstract
The utility model provides a satellite communication device and satellite communication method relates to the aerospace communication field, satellite communication device includes first communication unit, second communication unit and mode control unit, first communication unit communicates with first modem mode, the second communication unit communicates with the second modem mode, the frequency bandwidth of first modem mode is greater than the frequency bandwidth of second modem mode, the mode control unit can select to pass through first communication unit and/or the second communication unit communicates. According to the satellite communication device and the satellite communication method, the problem of poor anti-jamming capability of satellite communication can be solved, the anti-jamming capability of the satellite communication can be improved by setting the double communication modes with different frequency bandwidths, and balance can be carried out between occupied bandwidth and link reliability.
Description
Technical Field
The present application relates to the field of aerospace communications, and in particular, to a satellite communication device and a satellite communication method.
Background
With the rapid development of aerospace technology, the number of orbiting satellites is increasing day by day, which leads to higher resource occupancy rate of space radio environment, and the stability of satellite communication is deteriorated, and the possibility that the satellite is interfered in the communication process is increased.
In addition, the communication between the ground wireless devices may also cause interference to the satellite measurement and control station for transmitting and receiving signals, so that the satellite-ground communication is unstable, and the communication fails to cope with sudden interference events.
Disclosure of Invention
In view of the problems of poor interference resistance and unstable communication of the conventional satellite communication, the present application provides a satellite communication device and a satellite communication method. According to the satellite communication device and the satellite communication method, the anti-interference capability of satellite communication can be improved by setting the double communication modes with different frequency bandwidths, and balance between occupied bandwidth and link reliability can be realized.
A first aspect of the present application provides a satellite communication device including a first communication unit, a second communication unit, and a mode control unit, wherein the first communication unit communicates in a first modulation and demodulation manner, the second communication unit communicates in a second modulation and demodulation manner, a frequency bandwidth of the first modulation and demodulation manner is larger than a frequency bandwidth of the second modulation and demodulation manner, and the mode control unit can select to pass through the first communication unit and/or the second communication unit for communication.
Optionally, the satellite communication device may further comprise a mode switch capable of locking and unlocking the first communication unit.
Alternatively, the mode switch may receive a mode control command from the mode control unit, the mode control command being determined according to a connection state of a communication link, and lock or unlock the first communication unit in response to the mode control command.
Optionally, the mode control unit may receive a mode control instruction and select the first communication unit and/or the second communication unit to communicate according to the mode control instruction, where the mode control instruction is determined according to a connection state of a communication link.
Alternatively, the connection state of the communication link may include a signal-to-noise ratio of the communication link, and the mode control instruction may be determined by comparing the signal-to-noise ratio of the communication link with a preset signal-to-noise ratio threshold, and control the control operation of the mode switch according to the comparison result.
Optionally, the mode control instruction may control the mode switch to unlock the first communication unit to allow the first communication unit to communicate if the comparison result indicates that the signal-to-noise ratio of the communication link is less than the signal-to-noise ratio threshold.
Optionally, the connection state of the communication link may include a communication error rate, and the mode control instruction may control the control operation of the mode switch according to a comparison result by comparing the communication error rate with a preset communication error rate threshold, where the communication error rate refers to a transmission failure rate of the satellite communication device during data transmission.
Alternatively, the mode control instruction may control the mode switch to unlock the first communication unit to allow the first communication unit to perform communication, in a case where the comparison result indicates that the communication error rate of the communication link is greater than or equal to the communication error rate threshold.
Alternatively, the mode control unit may control the mode switch to lock the first communication unit so that the satellite communication device performs communication through the second communication unit in response to the end of the single communication.
A second aspect of the present application provides a satellite communication method, including: determining a connection status of the communication link; and selecting a first modulation and demodulation mode and/or a second modulation and demodulation mode for communication based on the connection state of the communication link, wherein the frequency bandwidth of the first modulation and demodulation mode is larger than that of the second modulation and demodulation mode.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 shows a schematic block diagram of a satellite communication device according to an embodiment of the invention;
fig. 2 shows a schematic block diagram of a first communication unit according to an embodiment of the invention;
fig. 3 shows a schematic block diagram of a second communication unit according to an embodiment of the invention;
FIG. 4 illustrates a schematic diagram of mode switching for a satellite communications device according to an embodiment of the present invention;
fig. 5 shows a schematic flow diagram of a satellite communication method according to an embodiment of the invention.
Icon: 100-a first communication unit; 101-a first transmitting module; 102-a first receiving module; 103-a first buffer module; 200-a second communication unit; 201-a second transmitting module; 202-a second receiving module; 203-a second buffer module; 300-a mode control unit; 400-mode switch; 500-a memory cell; 600-coding unit.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. 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.
It is to be noted that the term "comprising" will be used in the embodiments of the invention to indicate the presence of the features stated hereinafter, but does not exclude the addition of further features.
The invention provides a satellite communication device and a satellite communication method, which can improve the reliability of satellite communication by controlling the communication mode of the satellite communication device and balance the occupied bandwidth and the reliability.
It is noted that prior to the filing of the present application, in existing satellite communication schemes, basic modem techniques such as phase shift keying (BPSK), Frequency Shift Keying (FSK), or Amplitude Shift Keying (ASK) techniques were typically employed for communication.
For example, in satellite-to-ground communication, an uplink command and downlink telemetry may be loaded onto an uplink carrier and a downlink carrier, respectively, based on BPSK technology, FSK technology, or ASK technology, to complete transmission of valid data, and a ground receiver or a satellite receiver demodulates received data based on corresponding technology after receiving a signal. However, when the above-mentioned modulation and demodulation technology builds a satellite-ground link, the anti-interference capability is weak, the communication robustness is poor, and when the satellite-ground link encounters sudden interference, the receiver cannot demodulate effective data, and may not timely and effectively measure and control the satellite. In particular, in the radio UV frequency band, the signal diffraction capability is strong, and when some wireless devices on the ground are communicated with each other, interference may be caused to the transmission and reception of signals of the satellite measurement and control station.
An aspect of the present invention provides a satellite communication device that can improve interference resistance of satellite communication by controlling a communication mode thereof, and can balance occupied bandwidth and link reliability.
As shown in fig. 1, a satellite communication device according to an embodiment of the present invention may include a first communication unit 100, a second communication unit 200, and a mode control unit 300.
The first communication unit 100 can perform communication in the first modulation and demodulation scheme.
Specifically, as shown in fig. 2, the first communication unit 100 may include a first transmitting module 101 and a first receiving module 102. The first transmitting module 101 may modulate the data it receives and transmit the modulated data to the surface. The first receiving module 102 may demodulate the data it receives and transmit the demodulated data.
As an example, data received by the first transmission module 101 may come directly from a stand-alone device on the satellite, e.g., a stand-alone device on the satellite other than a satellite communicator may send satellite telemetry data to the first transmission module 101 for transmission to the ground through the first transmission module 101.
As another example, the first communication unit 100 may further include a first buffer module 103, and the first buffer module 103 may store data it receives and may provide the data it stores to the first transmission module 101 to transmit the data to other standalone devices on the ground or satellite through the first transmission module 101. Here, the first buffer module 103 may be implemented by a FIFO memory, for example.
The data received by the first receiving module 102 may be directly from a transmitting device on the ground.
In the case that the first communication unit 100 includes the first buffer module 103, the first receiving module 102 may send the demodulated data thereof to the first buffer module 103 for storage, so as to be called by subsequent processing. In another example, the first receiving module 102 may directly transmit its demodulated data to the mode control unit 300 to be described below for subsequent processing.
Here, the first modulation and demodulation scheme adopted by the first communication unit 100 may be a wideband modulation scheme, and may include a spread spectrum modulation and demodulation scheme, for example. In this way, when the satellite communication device performs communication via the first communication unit 100, the signal-to-noise ratio of the communication link can be increased, thereby ensuring the reliability of the communication link.
The second communication unit 200 may perform communication in the second modulation and demodulation scheme.
Specifically, as shown in fig. 3, the second communication unit 200 may include a second transmitting module 201 and a second receiving module 202. The second transmitting module 201 may modulate the data it receives and transmit the modulated data to the surface. The second receiving module 202 may demodulate the data it receives and transmit the demodulated data.
As an example, the data received by the second transmission module 201 may come directly from a stand-alone device on the satellite, e.g., a stand-alone device on the satellite other than a satellite communication device may send satellite telemetry data to the second transmission module 201 for transmission to the ground through the second transmission module 201.
As another example, the second communication unit 200 may further include a second buffering module 203, and the second buffering module 203 may store data it receives and may provide the data it stores to the second transmitting module 201 to transmit the data to other standalone devices on the ground or satellite through the second transmitting module 201. Here, the second buffer module 203 may be implemented by a FIFO memory, for example.
The data received by the second receiving module 202 may be directly from a transmitting device on the ground.
In the case that the second communication unit 200 includes the second buffer module 203, the second receiving module 202 may send the demodulated data thereof to the second buffer module 203 for storage, so as to be called by subsequent processing. In another example, the second receiving module 202 may directly transmit its demodulated data to the mode control unit 300 to be described below for subsequent processing.
Here, the second modulation and demodulation scheme adopted by the second communication unit 200 may be a narrowband modulation scheme, and may include one or more of a phase shift keying modulation and demodulation scheme, a frequency shift keying modulation and demodulation scheme, and an amplitude shift keying modulation and demodulation scheme, for example. In this way, in the case where the satellite communication device performs communication through the second communication unit 200, the communication bandwidth can be saved, and the occupation of space radio resources can be reduced.
In this context, with respect to the first modulation and demodulation scheme as the wideband modulation scheme and the second modulation and demodulation scheme as the narrowband modulation scheme, the terms "wideband" and "narrowband" may refer to a relative concept that the frequency bandwidth of the first modulation and demodulation scheme is larger than the frequency bandwidth of the second modulation and demodulation scheme. Therefore, the first modulation and demodulation scheme and the second modulation and demodulation scheme are not limited to the various conventional modulation and demodulation schemes listed above, and may include other schemes as long as they satisfy a comparison relationship between frequency bandwidths of the two schemes.
The satellite communication device may further include a mode control unit 300, and the mode control unit 300 may determine the type of the data demodulated by the first receiving module 102 or the second receiving module 202, specifically, the demodulated data may include data of a direct instruction type and data of an indirect instruction type, the direct instruction is an instruction for controlling an operating state of the satellite communication device, and the indirect instruction is an instruction or a data block for controlling a stand-alone device other than the satellite communication device on a satellite where the satellite communication device is located.
In the case where the demodulated data is direct instruction type data, the mode control unit 300 may control the communication mode of the satellite communication device based on the data. For example, the satellite communication device may further include a decoding unit 600, and the mode control unit 300 may transmit the data to the decoding unit 600, to decode the data through the decoding unit 600, and to execute the decoded instruction.
In the case where the demodulated data is indirect command type data, the mode control unit 300 may control the satellite communication device to forward the data to the satellite affair subsystem for managing the satellite, so that the satellite affair subsystem may control the corresponding stand-alone or injected data block based on a command from the satellite communication device.
Further, the mode control unit 300 can select communication through the first communication unit 100 and/or the second communication unit 200 to control the communication mode of the satellite communication device.
Specifically, the mode control unit 300 may receive a mode control instruction and select a corresponding communication mode, i.e. select the corresponding first communication unit 100 and/or second communication unit 200 for communication, based on the received instruction. The mode control command may be transmitted by the surface control system or other device and may indicate a selection of the first communication unit 100 and/or the second communication unit 200 for communication, which may be determined based on a connection status of the communication link. Here, the connection state of the communication link may characterize the current stability of the communication link.
In an example, the connection status of the communication link may include a signal-to-noise ratio of the communication link, and the mode control instruction may be determined by comparing the signal-to-noise ratio of the communication link with a preset signal-to-noise ratio threshold, and selecting the first communication unit 100 and/or the second communication unit 200 for communication according to the comparison result. Here, the signal-to-noise ratio threshold may be preset according to requirements, for example, the signal-to-noise ratio may be expressed as Eb/N0, where Eb represents the signal energy averaged to each bit, and N0 represents the power spectral density of the noise, in which case, the signal-to-noise ratio threshold may be 10dB, and further, the signal-to-noise ratio threshold may be 8 dB.
In particular, the mode control instruction may instruct the mode control unit 300 to control the satellite communication device to communicate through the first communication unit 100 in case the signal-to-noise ratio of the communication link is less than the signal-to-noise ratio threshold. When the signal-to-noise ratio of the communication link is smaller than the signal-to-noise ratio threshold, it may be considered that the error rate of the current communication of the communication link is large, the communication link is in an unstable state, and may have an adverse effect on the flight control of the orbiting satellite.
The mode control instruction may instruct the mode control unit 300 to control the satellite communication device to communicate through the second communication unit 200 in case the signal-to-noise ratio of the communication link is greater than or equal to the signal-to-noise ratio threshold. When the signal-to-noise ratio of the communication link is greater than or equal to the signal-to-noise ratio threshold, the communication link may be considered to be in a stable state, which is sufficient to provide reliable communication, and in this case, communication may be performed through the second communication unit 200, that is, communication may be performed through the second modulation and demodulation manner, so as to save the bandwidth occupied by communication and release spatial radio resources.
The communication link may include a downlink communication link that may be used to transmit telemetry data in satellite-to-ground communications. Preferably, in case the signal-to-noise ratio of the downlink communication link is smaller than the signal-to-noise ratio threshold, the mode control instruction may instruct the mode control unit 300 to unlock the first communication unit 100 and may control the first communication unit 100 to perform the downlink communication.
In another example, the connection status of the communication link may include a communication error rate, and the mode control instruction may be determined by comparing the communication error rate with a preset communication error rate threshold, and selecting the first communication unit 100 and/or the second communication unit 200 for communication according to the comparison result. Here, the communication error rate threshold refers to a transmission failure rate of the satellite communication device in transmitting data, and may be preset according to a requirement.
As an example, the communication error rate threshold may be the number of transmission times that consecutive transmission fails, for example, the communication error rate threshold may be n, and when n or more instructions or data packets are continuously transmitted and are not correctly received, it may be considered that the connection state of the current communication link is bad and the stability is poor. As another example, the communication error rate threshold may also be a failure rate of transmitting data in a predetermined data amount, a predetermined number of transmissions, or a predetermined transmission time, for example, it may be a ratio of a data amount/number of transmissions/transmission time at which transmission of data in a predetermined data amount/predetermined number of transmissions/predetermined transmission time fails to a predetermined data amount/predetermined number of transmissions/predetermined transmission time.
Specifically, in the case where the communication error rate of the communication link is greater than or equal to the communication error rate threshold, the mode control instruction may instruct the mode control unit 300 to control the satellite communication device to communicate through the first communication unit 100. When the communication error rate of the communication link is greater than or equal to the communication error rate threshold, the communication link may be considered to be in an unstable state, which may adversely affect the flight control of the orbiting satellite.
In the case where the communication error rate of the communication link is less than the communication error rate threshold, the mode control instruction may instruct the mode control unit 300 to control the satellite communication device to communicate through the second communication unit 200. When the communication error rate of the communication link is less than the communication error rate threshold, the communication link may be considered to be in a stable state, which is sufficient to provide reliable communication, and in this case, the communication may be performed through the second communication unit 200, that is, the communication may be performed through the second modulation and demodulation manner, so as to save the bandwidth occupied by the communication and release the spatial radio resource.
The communication link may include an uplink that may be used to transmit terrestrial commands in satellite-to-ground communications. Preferably, in the case where the communication error rate of the uplink communication link is greater than or equal to the communication error rate threshold, or in the case where the signal-to-noise ratio is less than the signal-to-noise ratio threshold, the mode control instruction may instruct the mode control unit 300 to unlock the first communication unit 100, and may control the first communication unit 100 to perform uplink communication.
Further, the communication links may include an uplink communication link and a downlink communication link, and the mode control unit 300 may select the first communication unit 100 or the second communication unit 200 for communication according to a mode control instruction determined based on connection states of the uplink communication link and the downlink communication link, respectively. Specifically, the uplink communication link and the downlink communication link may be separately controlled, and the uplink communication link and the downlink communication link may communicate through the same communication unit or may communicate through different communication units.
Furthermore, the satellite communication device may further comprise a mode switch 400, the mode switch 400 being capable of locking and unlocking the first communication unit 100 and/or the second communication unit 200.
In the case where the satellite communication device includes the mode switch 400, the mode control command may be determined according to the connection state of the communication link to control the operation state of the mode switch 400 and select the first communication unit 100 and/or the second communication unit 200 for communication.
The mode switch 400 may be a switch for locking and unlocking the first communication unit 100. In the state where the mode switch 400 is on, the satellite communication device may be allowed to communicate through the first communication unit 100, that is, the first communication unit 100 may be in the unlocked state; in the state where the mode switch 400 is in the off state, the satellite communication device is not allowed to communicate through the first communication unit 100, that is, the first communication unit 100 may be in the locked state. In this example, the second communication unit 200 may always be in an available state. Here, the mode switch 400 may be implemented by hardware, and may also be implemented by software.
In this case, the mode control unit 300 may control the mode switch 400 to be turned on or off to unlock or lock the first communication unit 100. For example, the mode control unit 300 may control the mode switch 400 to be turned on or off according to the mode control instruction determined based on the connection state of the communication link as described above, and select communication through the first communication unit 100 and/or the second communication unit 200.
Specifically, as shown in fig. 4, the mode control instructions may include mode control instructions M1, M2, M3, M4, M5 and M6, wherein the mode control instruction M1 instructs to turn on the mode switch 400, the mode control instruction M2 instructs to turn off the mode switch 400, the mode control instruction M3 instructs to perform communication of an uplink communication link through the first communication unit 100, the mode control instruction M4 instructs to switch communication of an uplink communication link performed through the first communication unit 100 to communication of an uplink communication link performed through the second communication unit 200, the mode control instruction M5 instructs to perform communication of a downlink communication link through the first communication unit 100, and the mode control instruction M6 instructs to switch communication of a downlink communication link performed through the first communication unit 100 to communication of a downlink communication link performed through the second communication unit 200.
The modes of the satellite communication device may include modes S0, S1, S2, S3, and S4, S0, wherein the mode S0 represents that the mode switch 400 is in an off state (i.e., the first communication unit 100 is locked), communication of an uplink communication link is performed through the second communication unit 200, and communication of a downlink communication link is performed through the second communication unit 200; the mode S1 indicates that the mode switch 400 is in an open state (i.e., the first communication unit 100 is unlocked), communication of the uplink communication link is performed through the second communication unit 200, and communication of the downlink communication link is performed through the second communication unit 200; the mode S2 indicates that the mode switch 400 is in an open state (i.e., the first communication unit 100 is unlocked), communication of the uplink communication link is performed through the first communication unit 100, and communication of the downlink communication link is performed through the second communication unit 200; the mode S3 indicates that the mode switch 400 is in an open state (i.e., the first communication unit 100 is unlocked), communication of an uplink communication link is performed through the second communication unit 200, and communication of a downlink communication link is performed through the first communication unit 100; the mode S3 indicates that the mode switch 400 is in an open state (i.e., the first communication unit 100 is unlocked), communication of an uplink communication link is performed through the first communication unit 100, and communication of a downlink communication link is performed through the first communication unit 100.
Fig. 4 shows a process of switching modes when the satellite communication device receives different mode control commands in different communication modes.
Specifically, the default mode for the satellite may be mode S0. When receiving the command M1, the mode control unit 300 may control the mode switch 400 to be turned on, entering the mode S1.
In response to receiving the command M2 while the satellite communication device is in the mode S1, the satellite communication device enters the mode S0, i.e., the mode control unit 300 may control the mode switch 400 to be turned off; in response to receiving the instruction M3, the satellite communication device enters the mode S2, i.e., performs communication of the uplink communication link through the first communication unit 100; if the instruction M5 is received, the mode S3 is entered, i.e. communication of the downlink communication link is performed by the first communication unit 100.
In response to receiving the command M2 command while the satellite communication device is in the mode S2, the satellite communication device enters the mode S0, i.e., the mode control unit 300 may control the mode switch 400 to be turned off; in response to receiving the instruction M4, the satellite communication device enters the mode S1, the mode control unit 300 may switch the communication performing the uplink communication link through the first communication unit 100 to the communication performing the uplink communication link through the second communication unit 200; in response to receiving the M5 instruction, the satellite communication device enters the S4 state, and the mode control unit 300 may control communication performed on the downlink communication link through the first communication unit 100.
In response to receiving the command M2 command while the satellite communication device is in the mode S3, the satellite communication device enters the mode S0, i.e., the mode control unit 300 may control the mode switch 400 to be turned off; in response to receiving the M3 instruction, the satellite communication device enters the mode S4, i.e., the mode control unit 300 may control the mode switch 400 to be turned on; in response to receiving the M6 command, the satellite communication device enters the S1 state, i.e., the mode control unit 300 may control the mode switch 400 to be turned off.
In response to receiving the command M2 command while the satellite communication device is in the mode S4, the satellite communication device enters the mode S0, i.e., the mode control unit 300 may control the mode switch 400 to be turned off; in response to receiving the M4 instruction, the satellite communication device enters the mode S3, the mode control unit 300 may switch the communication performing the uplink communication link through the first communication unit 100 to the communication performing the uplink communication link through the second communication unit 200; in response to receiving the M6 instruction, the satellite communication device enters the S2 state, and the mode control unit 300 may switch the communication performing the downlink communication link through the first communication unit 100 to the communication performing the downlink communication link through the second communication unit 200.
Further, the mode control unit 300 may control the mode switch 400 to lock the first communication unit in response to the end of the single communication such that the satellite communication device communicates through the second communication unit but cannot communicate through the first communication unit.
In the above-mentioned example, in the case where the signal-to-noise ratio of the communication link is less than the signal-to-noise ratio threshold, the mode control unit 300 may first cause the mode switch 400 to be opened in response to the instruction M1, and may then control the communication performed on the downlink communication link by the first communication unit 100 in response to the instruction M5. At the end of a single communication, for example, when the current measurement and control arc segment in the telemetry process is about to be completed, the mode control unit 300 may control to switch the communication of the downlink communication link performed through the first communication unit 100 to the communication of the downlink communication link performed through the second communication unit 200 in response to the instruction M6, and may then cause the mode switch 400 to be turned off in response to the instruction M2 to lock the first communication unit 100. Here, the time point at which the single communication ends (for example, the time point at which the measurement and control arc segment is about to be completed) may refer to a time point separated from an outbound time point in the satellite transit time by a predetermined time, for example, the satellite transit time may be 10 minutes, and the time point at which the single communication ends may be a time point 1 minute before the satellite outbound time point, that is, a time point at the 9 th minute of satellite inbound.
In another example mentioned hereinabove, in the case where the communication error rate of the communication link is greater than the communication error rate threshold, the mode control unit 300 may first cause the mode switch 400 to be opened in response to the instruction M1, and may then control the communication of the uplink communication link performed by the first communication unit 100 in response to the instruction M3. At the end of a single communication, for example, when all the instructions in the current measurement and control arc segment in the instruction transmission process are filled up, the mode control unit 300 may control to switch the communication for performing the uplink communication link through the first communication unit 100 to the communication for performing the uplink communication link through the second communication unit 200 in response to the instruction M4, and then may cause the mode switch 400 to be turned off in response to the instruction M2 to lock the first communication unit 100.
Specifically, the mode control unit 300 may receive a control instruction and select a corresponding communication mode, i.e. select the corresponding first communication unit 100 and/or second communication unit 200 for communication, based on the received instruction. The control command may be sent by a ground control system or other device, and the mode control command may indicate a selection of the first communication unit 100 and/or the second communication unit 200 for communication, which may be determined based on a connection status of the communication link. Here, the connection state of the communication link may characterize the current stability of the communication link.
When the mode control unit 300 receives a control instruction (e.g., control instructions M3 through M6) that controls the first communication unit 100 and/or the second communication unit 200 to perform communication, the mode control unit 300 may first determine whether the operating state of the mode switch 400 satisfies an instruction requirement, and when the control instruction requirement is satisfied, may control the first communication unit 100 and/or the second communication unit 200 to perform communication according to the control instruction; when the control command requirement is not met, the control command can be identified as an invalid command, and the result that the control command cannot be executed can be fed back to the control party (for example, a ground control system) sending the control command.
For example, when the control instruction indicates that communication is performed through the first communication unit, whether the mode switch is turned on may be detected first, and when it is detected that the mode switch is in the on state, communication may be performed through the first communication unit according to the control instruction; when the mode switch is detected to be in the closed state, the control party sending the control instruction can be fed back to indicate a prompt message that the mode switch is in the closed state, so as to confirm whether the mode switch needs to be opened or not.
Here, since the first modulation and demodulation scheme needs to occupy more spectrum resources than the second modulation and demodulation scheme, unnecessary spectrum waste can be avoided by setting the mode switch, and communication by the second communication unit using the second modulation and demodulation scheme is allowed only when the mode switch is turned on, otherwise, even if a control instruction instructing communication by the second communication unit is received, it is judged as an invalid instruction.
In addition, the satellite communication device may further include a storage unit 500, and the storage unit 500 may store the control instruction and the states of the flash storage area and the cache module in advance for consistency check, so as to provide an important guarantee for the state authenticity.
In satellite communication, occupied spectrum bandwidth and link reliability are mutually restricted, and ideally, the occupied spectrum resource is as little as possible and communication is carried out under the condition of low signal-to-noise ratio, however, in actual use, the transmission rate of communication is unchanged, and under the condition of reducing communication bandwidth, the signal-to-noise ratio is inevitably reduced; in contrast, in the case of a low signal-to-noise ratio, the communication bandwidth needs to be increased. According to the satellite communication device, the occupied bandwidth and the link reliability are balanced, and the communication can be carried out in a narrow-band modulation mode under the condition that a communication link is stable, so that the occupied bandwidth is reduced; under the condition that the communication link has large interference, the communication can be carried out in a broadband modulation mode, so that the signal quality is improved, and the measurement and control requirements of the satellite in transit are met.
Another aspect of the invention provides a method of satellite communication. As shown in fig. 5, the satellite communication method may include the steps of:
and S1, determining the connection state of the communication link.
In this step, the communication link may include an uplink communication link and a downlink communication link, and the connection state of the communication link may characterize the stability of the communication link.
S2, selecting to communicate through the first modulation and demodulation mode and/or the second modulation and demodulation mode based on the connection state of the communication link.
In this step, the frequency bandwidth of the first modem mode is larger than the frequency bandwidth of the second modem mode.
Specifically, the first modulation and demodulation mode may be a wideband modulation mode, and the second modulation and demodulation mode may be a narrowband modulation mode. As an example, the first modulation and demodulation mode may include a spread spectrum modulation and demodulation mode, and the second modulation and demodulation mode may include a phase shift keying modulation and demodulation mode, a frequency shift keying modulation and demodulation mode, or an amplitude shift keying modulation and demodulation mode.
Similarly as described above, the "wideband" and "narrowband" described herein may refer to a relative concept that the frequency bandwidth of the first modem mode is larger than the frequency bandwidth of the second modem mode. Therefore, the first modem mode and the second modem mode are not limited to the various existing modem techniques listed above, but may include other techniques as long as they satisfy a comparison relationship of frequency bandwidths of the two.
In an example, the connection status of the communication link may include a signal-to-noise ratio of the communication link, in which case step S2 may include: and selecting the first modulation and demodulation mode and/or the second modulation and demodulation mode for communication based on the signal-to-noise ratio of the communication link.
Specifically, the snr of the communication link may be compared with a preset snr threshold, and communication via the first modem mode and/or the second modem mode may be selected according to the comparison result. Here, the signal-to-noise ratio threshold may be preset according to requirements, for example, the signal-to-noise ratio may be expressed as Eb/N0, where Eb represents the signal energy averaged to each bit, and N0 represents the power spectral density of the noise, in which case, the signal-to-noise ratio threshold may be 10dB, and further, the signal-to-noise ratio threshold may be 8 dB.
The communication may be conducted in a first modem mode where a signal-to-noise ratio of the communication link is less than a signal-to-noise ratio threshold. When the signal-to-noise ratio of the communication link is smaller than the signal-to-noise ratio threshold value, the error rate of the current communication of the communication link is considered to be large, the communication link is in an unstable state, and adverse effects may be caused on the flight control of the orbiting satellite.
The communication may be conducted via the second modem mode in the event that the signal-to-noise ratio of the communication link is greater than or equal to the signal-to-noise ratio threshold. When the signal-to-noise ratio of the communication link is greater than or equal to the signal-to-noise ratio threshold, the communication link can be considered to be in a stable state and be sufficient to provide reliable communication, and in this case, communication can be performed through the second modulation and demodulation mode so as to save the bandwidth occupied by communication and release spatial radio resources.
In another example, the connection state of the communication link may include a communication error rate, in which case step S2 may include: and selecting the first modulation and demodulation mode and/or the second modulation and demodulation mode for communication based on the communication error rate of the communication link.
Specifically, the communication error rate may be compared with a preset communication error rate threshold, and the first modem mode and/or the second modem mode may be selected for communication according to the comparison result. Here, the communication error rate threshold refers to a transmission failure rate of the satellite communication device in transmitting data, and may be preset according to a requirement.
As an example, the communication error rate threshold may be the number of transmission times that consecutive transmission fails, for example, the communication error rate threshold may be n, and when n or more instructions or data packets are continuously transmitted and are not correctly received, it may be considered that the connection state of the current communication link is bad and the stability is poor. As another example, the communication error rate threshold may also be a failure rate of transmitting data in a predetermined data amount, a predetermined number of transmissions, or a predetermined transmission time, for example, it may be a ratio of a data amount/number of transmissions/transmission time at which transmission of data in a predetermined data amount/predetermined number of transmissions/predetermined transmission time fails to a predetermined data amount/predetermined number of transmissions/predetermined transmission time.
The satellite communication device may be controlled to communicate via the first modem mode in the event that the communication error rate of the communication link is greater than or equal to the communication error rate threshold. When the communication error rate of the communication link is greater than or equal to the communication error rate threshold value, the communication link is considered to be in an unstable state, and the adverse effect on the flight control of the orbiting satellite can be generated.
And controlling the satellite communication device to communicate through the second modulation and demodulation mode under the condition that the communication error rate of the communication link is smaller than the communication error rate threshold value. When the communication error rate of the communication link is smaller than the communication error rate threshold value, the communication link can be considered to be in a stable state and is sufficient to provide reliable communication, and in this case, the communication can be performed through the second modulation and demodulation mode, so that the bandwidth occupied by the communication is saved, and the space radio resource is released.
When communication via the downlink communication link is required, the first modem mode and/or the second modem mode are selected for communication based on the signal-to-noise ratio. Specifically, the snr of the downlink communication link may be compared with a preset snr threshold, and the downlink communication link may be selected to be communicated through the first modem mode and/or the second modem mode according to the comparison result. The downlink communication link communication may be conducted in the first modem mode in a case where the signal-to-noise ratio of the downlink communication link is less than the signal-to-noise ratio threshold.
When communication through the uplink communication link is needed, the communication through the first modulation and demodulation mode and/or the second modulation and demodulation mode is selected preferably based on the communication error rate. Specifically, the communication error rate of the uplink communication link may be compared with a preset communication error rate threshold, and the uplink communication link may be selected to be communicated through the first modulation and demodulation mode and/or the second modulation and demodulation mode according to the comparison result. In the case where the communication error rate of the uplink communication link is greater than or equal to the communication error rate threshold, the uplink communication link communication may be performed by the first modem mode.
Further, the first modulation and demodulation mode or the second modulation and demodulation mode may be selected for communication on the uplink communication link and communication on the downlink communication link, respectively, according to the connection states of the uplink communication link and the downlink communication link, respectively, for communication. Specifically, the uplink and the downlink may be separately controlled, and the uplink and the downlink may communicate in the same modem mode or in different modem modes.
Further, step S2 may further include: determining a current working mode of the communication link based on the communication request, and sending a mode confirmation message; and selecting to communicate through the first modulation and demodulation mode and/or the second modulation and demodulation mode based on the response instruction of the mode confirmation message. Here, the communication request carries information of the operation mode desired to be used, such as a mode control command.
In this step, upon receipt of a communication request, the current operating mode of the communication link requested to be used in the communication request, i.e. the first modem mode or the second modem mode, may be determined. The mode confirmation message carries information of the determined current working mode of the communication link, and the mode confirmation message can be sent to a requesting party of the communication request (for example, the ground in the satellite-ground communication) so as to inform the requesting party of the current working mode of the communication link and inquire whether to confirm to execute the communication request.
The response instruction may be an instruction for confirming the mode confirmation message, specifically, when the current operation mode of the communication link is the first modem mode, and the mode requested to be used in the communication request is the second modem mode, the mode confirmation message may prompt the requesting party that the current operation mode of the communication link is the second modem mode, and ask whether to confirm the switching to the first modem mode, and the requesting party may feed back a response instruction in response to the mode confirmation message to indicate that the switching mode is confirmed or the switching mode is stopped.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working process of the method described above may refer to the corresponding process in the foregoing device embodiment, and is not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme of the application.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
According to the satellite communication device and the satellite communication method, the double communication units with different frequency bandwidths can be arranged, one or two of the communication units can be selected for communication, so that the anti-interference capacity of satellite communication can be improved, and balance between the occupied bandwidth and the link reliability can be realized.
In addition, according to the satellite communication device and the satellite communication method, the communication units can be locked or unlocked by arranging the mode switch, so that the corresponding communication units can be unlocked before the communication units are selected for communication, and the communication units can be locked when the communication is not carried out, and the use safety of the satellite is ensured.
In addition, according to the satellite communication device and the satellite communication method of the present application, the communication unit can be selected for communication according to the connection state of the communication link, and thus the communication mode of the satellite communication device can be flexibly selected according to the current communication state.
In addition, according to the satellite communication device and the satellite communication method, the communication unit can be selected to perform communication according to the signal-to-noise ratio or the communication error rate of the communication link, so that switching between the first modulation and demodulation mode communication and the second modulation and demodulation mode communication can be performed according to the interference situation of the actual link, and when the link state is good, the second modulation and demodulation mode is used for communication, so that the communication bandwidth is saved; when the link state is not good, the first modulation and demodulation mode is switched to for communication, the signal to noise ratio is improved, and therefore the reliability of the satellite-ground communication link is guaranteed.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (4)
1. A satellite communication apparatus comprising a first communication unit that performs communication in a first modulation/demodulation scheme, a second communication unit that performs communication in a second modulation/demodulation scheme, a frequency bandwidth of the first modulation/demodulation scheme being larger than a frequency bandwidth of the second modulation/demodulation scheme, and a mode control unit that can select communication by the first communication unit and/or the second communication unit; the satellite communication device further comprises a mode switch capable of locking and unlocking the first communication unit;
the mode control unit receives a mode control instruction and selects the first communication unit and/or the second communication unit to communicate according to the mode control instruction, and the mode control instruction is determined according to the connection state of a communication link;
the connection state of the communication link comprises a signal-to-noise ratio of the communication link, the mode control instruction is determined by comparing the signal-to-noise ratio of the communication link with a preset signal-to-noise ratio threshold value and controls the control operation of the mode switch according to a comparison result, and the mode control instruction controls the mode switch to unlock the first communication unit to allow the first communication unit to communicate when the comparison result shows that the signal-to-noise ratio of the communication link is smaller than the signal-to-noise ratio threshold value; or the connection state of the communication link comprises a communication error rate, the mode control instruction is determined by comparing the communication error rate with a preset communication error rate threshold value, and controls the control operation of the mode switch according to the comparison result, wherein the communication error rate refers to the transmission failure rate of the satellite communication device in the data transmission process, and the mode control instruction controls the mode switch to unlock the first communication unit to allow the first communication unit to communicate if the comparison result indicates that the communication error rate of the communication link is greater than or equal to the communication error rate threshold value.
2. The satellite communication device according to claim 1, wherein the mode switch receives a mode control command from the mode control unit, the mode control command being determined according to a connection state of a communication link, and locks or unlocks the first communication unit in response to the mode control command.
3. The satellite communication device according to claim 1, wherein the mode control unit controls the mode switch to lock the first communication unit in response to an end of a single communication so that the satellite communication device performs communication through the second communication unit.
4. A satellite communication method for the satellite communication apparatus according to any one of claims 1 to 3, the satellite communication method comprising:
determining a connection status of the communication link;
and selecting a first modulation and demodulation mode and/or a second modulation and demodulation mode for communication based on the connection state of the communication link, wherein the frequency bandwidth of the first modulation and demodulation mode is larger than that of the second modulation and demodulation mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110741307.7A CN113328791B (en) | 2021-07-01 | 2021-07-01 | Satellite communication device and satellite communication method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110741307.7A CN113328791B (en) | 2021-07-01 | 2021-07-01 | Satellite communication device and satellite communication method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113328791A CN113328791A (en) | 2021-08-31 |
| CN113328791B true CN113328791B (en) | 2022-04-26 |
Family
ID=77425284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110741307.7A Active CN113328791B (en) | 2021-07-01 | 2021-07-01 | Satellite communication device and satellite communication method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113328791B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114142917B (en) * | 2022-01-14 | 2024-03-19 | 中国人民解放军61096部队 | Satellite channel selection method and device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234152A (en) * | 1996-10-25 | 1999-11-03 | 艾利森公司 | Dual mode symmetric/asymmetric communication control system |
| WO2018107362A1 (en) * | 2016-12-13 | 2018-06-21 | 海能达通信股份有限公司 | Wideband and narrowband communication device and method |
| CN113038568A (en) * | 2021-03-12 | 2021-06-25 | 重庆邮电大学 | Routing method based on signal-to-noise ratio in satellite communication system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6807405B1 (en) * | 1999-04-28 | 2004-10-19 | Isco International, Inc. | Method and a device for maintaining the performance quality of a code-division multiple access system in the presence of narrow band interference |
| US7623859B2 (en) * | 2001-09-14 | 2009-11-24 | Atc Technologies, Llc | Additional aggregate radiated power control for multi-band/multi-mode satellite radiotelephone communications systems and methods |
| CN1816187A (en) * | 2005-02-05 | 2006-08-09 | 广州天润信息科技有限公司 | Multi-module mobile telecommunication terminal and method |
| CN108923841B (en) * | 2018-06-27 | 2019-05-07 | 陕西博实测控科技有限公司 | A kind of satellite communication in moving multi-mode signal detection method |
| CN113055965B (en) * | 2019-12-10 | 2023-03-31 | 成都鼎桥通信技术有限公司 | Wide-narrow dual-mode cluster terminal and mode switching method and device thereof |
-
2021
- 2021-07-01 CN CN202110741307.7A patent/CN113328791B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1234152A (en) * | 1996-10-25 | 1999-11-03 | 艾利森公司 | Dual mode symmetric/asymmetric communication control system |
| WO2018107362A1 (en) * | 2016-12-13 | 2018-06-21 | 海能达通信股份有限公司 | Wideband and narrowband communication device and method |
| CN113038568A (en) * | 2021-03-12 | 2021-06-25 | 重庆邮电大学 | Routing method based on signal-to-noise ratio in satellite communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113328791A (en) | 2021-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102386956B (en) | Method and device for rank step-down for MIMO SCW design employing HARQ | |
| US8706025B2 (en) | Link performance difference metrics and link adaptation for mesh satellite networks | |
| CN101331787B (en) | Multi-hop wireless mesh network medium access control protocol | |
| US6359934B1 (en) | Adaptive modulation method | |
| US8452238B2 (en) | Radio transmission device, method for determining modulation system, and recording medium therefor | |
| US20090207735A1 (en) | Robust cooperative spectrum sensing for cognitive radios | |
| JP4800378B2 (en) | Wireless communication apparatus and relay transmission method | |
| CN113328791B (en) | Satellite communication device and satellite communication method | |
| US9768854B2 (en) | Systems and methods for adaptive repeaters | |
| CA3163380C (en) | Systems and methods for operating a multi-band satellite terminal | |
| JP3637884B2 (en) | Despreading device, propagation path estimation device, reception device and interference suppression device, despreading, propagation channel estimation, reception and interference suppression method, program, and recording medium recording the program | |
| CN102326426A (en) | Method for adaptive modulation, wireless communication system, and wireless device | |
| US8781513B2 (en) | Radio communication system, radio communication device, and radio communication method | |
| KR100953567B1 (en) | Data reception acknowledge signal transmission/reception apparatus and method in mobile communication system | |
| US8270291B2 (en) | Protected variable data rate communication systems | |
| JP5037005B2 (en) | Base station, radio communication terminal, base station control method, and radio communication terminal control method | |
| KR102358613B1 (en) | Cooperative Jamming Power Selecting System and Method for Secure Communication via Untrusted Relay with Imperfect Channel Estimation | |
| US9787333B2 (en) | Subcarrier power reallocation | |
| US7123888B2 (en) | Variable communication system | |
| US8422554B2 (en) | Mobile communication system using adaptive transmission | |
| KR101371148B1 (en) | Base station, mobile station for processing wireless communication each other, and method for controlling the same | |
| KR20180102383A (en) | LoRa SERVER AND METHOD FOR NETWORK COMMUNICATION RECOVERY THEREOF | |
| EP2438775A1 (en) | Apparatus and method for resource utilisation in wireless systems | |
| US7257085B2 (en) | Method and controller for data rate adaptation in wireless communication networks | |
| WO2023139696A1 (en) | Wireless communication system, wireless communication method, and wireless device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Du Jiangchong Inventor after: Xue Yao Inventor before: Du Jiangchong |