CN114158128A - Asymmetric dynamic time slot communication method and device for covert communication of synchronous orbit satellite - Google Patents
Asymmetric dynamic time slot communication method and device for covert communication of synchronous orbit satellite Download PDFInfo
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- CN114158128A CN114158128A CN202210123805.XA CN202210123805A CN114158128A CN 114158128 A CN114158128 A CN 114158128A CN 202210123805 A CN202210123805 A CN 202210123805A CN 114158128 A CN114158128 A CN 114158128A
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Abstract
The invention provides an asymmetric dynamic time slot communication method and device for covert communication of a synchronous orbit satellite, wherein the asymmetric dynamic time slot communication method for covert communication of the synchronous orbit satellite comprises the following steps: receiving a target frame corresponding to first uplink data sent by a terminal; generating time delay precompensation based on a target frame corresponding to the first uplink data; based on time delay precompensation, sending first downlink data for responding to a target frame corresponding to the first uplink data to the terminal; the first downlink data comprises rate information and frame length information used for indicating the terminal to send the second uplink data; the time delay precompensation is used for enabling the terminal to receive the first downlink data when the target frame corresponding to the first uplink data is sent and the terminal is switched to a receiving state. The asymmetric dynamic time slot communication method for the hidden communication of the synchronous orbit satellite can flexibly support asymmetric services, improve the utilization rate of time-frequency resources, shorten the air duration of signals and improve the anti-detection capability.
Description
Technical Field
The invention relates to the technical field of communication satellites, in particular to an asymmetric dynamic time slot communication method and device for covert communication of a synchronous orbit satellite.
Background
The satellite communication system is an important component of the global communication system, and has the advantages of long transmission distance, wide coverage range, flexible and various communication modes, no influence of geographical environment and the like. In the related art, a miniaturized terminal generally operates in a half-duplex mode, that is, only data can be received or transmitted at the same time, but data cannot be received and transmitted at the same time; the traditional satellite network protocol adopts fixed uplink and downlink symmetric time slots, which causes the waste of distributed fixed downlink time-frequency resources and reduces the data throughput of the system for a system which emphasizes uplink data return.
Disclosure of Invention
The invention provides an asymmetric dynamic time slot communication method and device for covert communication of a synchronous orbit satellite, which are used for solving the defect of high waste rate of time-frequency resources of satellite communication in the prior art and realizing efficient resource allocation.
The invention provides an asymmetric dynamic time slot communication method for covert communication of a synchronous orbit satellite, which comprises the following steps:
receiving a target frame corresponding to first uplink data sent by a terminal;
generating time delay precompensation based on a target frame corresponding to the first uplink data;
based on the time delay precompensation, sending first downlink data for responding to a target frame corresponding to the first uplink data to the terminal; wherein the content of the first and second substances,
the first downlink data comprises rate information and frame length information for indicating the terminal to send second uplink data;
and the time delay precompensation is used for enabling the terminal to receive the first downlink data when the target frame corresponding to the first uplink data is sent and the receiving state is switched.
According to the asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite, provided by the invention, the generation of the time delay precompensation based on the target frame corresponding to the first uplink data comprises the following steps:
calculating a communication distance between the satellite and the terminal;
generating a propagation delay between a satellite and the terminal based on the communication distance;
and generating the delay precompensation based on the frame length of the target frame corresponding to the first uplink data and the propagation delay.
According to the asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite, provided by the invention, the rate information is determined by the following method:
performing signal-to-noise ratio calculation on a target frame corresponding to the first uplink data to generate a prediction result of a channel state of a next time slot;
generating the rate information based on the prediction result.
According to the asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite, provided by the invention, before a target frame corresponding to first uplink data sent by a receiving terminal, the method comprises the following steps:
broadcasting a pilot frequency;
receiving a request signal sent by the terminal, wherein the request signal is generated by the terminal based on the pilot frequency;
analyzing the request signal to generate a response signal;
sending the response signal to the terminal; wherein, the response signal includes rate information and frame length information for instructing the terminal to send the first uplink data.
According to the asymmetric dynamic time slot communication method for covert communication of the synchronous orbit satellite, provided by the invention, the target frame comprises the following steps: the frame header and the data section are combined,
a transmission rate of the data segment is determined based on the rate information;
the data segment includes at least one data packet of a target length, and the number of the data packets is determined based on the frame length information.
The invention also provides another asymmetric dynamic time slot communication method for covert communication of a synchronous orbit satellite, which comprises the following steps:
receiving first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information for indicating a terminal to send second uplink data;
and sending a target frame corresponding to the second uplink data to the satellite based on the first downlink data.
According to the asymmetric dynamic timeslot communication method for covert communication of a synchronous orbit satellite, provided by the invention, the sending of the target frame corresponding to the second uplink data to the satellite based on the first downlink data comprises:
processing the first downlink data to generate second uplink data;
and after the first uplink data target time length is processed, sending a target frame corresponding to the second uplink data to the satellite.
The invention also provides an asymmetric dynamic time slot communication device for covert communication of a synchronous orbit satellite, which comprises the following components:
the first receiving module is used for receiving a target frame corresponding to first uplink data sent by a terminal;
a first generating module, configured to generate a delay precompensation based on a target frame corresponding to the first uplink data;
a first sending module, configured to send, to the terminal, first downlink data for responding to a target frame corresponding to the first uplink data based on the delay precompensation; wherein the content of the first and second substances,
the first downlink data comprises rate information and frame length information for indicating the terminal to send second uplink data;
and the time delay precompensation is used for enabling the terminal to receive the first downlink data when the target frame corresponding to the first uplink data is sent and the receiving state is switched.
The invention also provides another asymmetric dynamic time slot communication device for covert communication of a synchronous orbit satellite, which comprises:
the second receiving module is used for receiving first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information used for indicating a terminal to send second uplink data;
and a second sending module, configured to send, to the satellite, a target frame corresponding to the second uplink data based on the first downlink data.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of the asymmetric dynamic timeslot communication method for covert communication of geostationary orbiting satellites as described in any of the above when executing the program.
The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the asymmetric dynamic timeslot communication method for geostationary orbit satellite covert communication as described in any of the above.
The present invention also provides a computer program product comprising a computer program which, when executed by a processor, performs the steps of the asymmetric dynamic timeslot communication method for geostationary orbit satellite covert communication as described in any of the above.
According to the asymmetric dynamic time slot communication method and device for the covert communication of the synchronous orbit satellite, the transmission of uplink data is controlled by adopting the self-adaptive variable rate in the data transmission stage, so that the flexibility and the reliability of data transmission are obviously improved; and the time for transmitting the first downlink data by the satellite is controlled by setting time delay precompensation, so that the terminal can start to receive and process the first downlink data when a target frame corresponding to the first uplink data is just sent out, and the utilization rate of uplink time-frequency resources is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of an asymmetric dynamic timeslot communication method for covert communication of a geostationary orbit satellite according to the present invention;
FIG. 2 is a second schematic flowchart of an asymmetric dynamic timeslot communication method for covert communication of geostationary orbit satellites according to the present invention;
FIG. 3 is a third schematic flow chart of an asymmetric dynamic timeslot communication method for covert communication of a geostationary orbit satellite according to the present invention;
FIG. 4 is one of the schematic diagrams of the asymmetric dynamic timeslot communication method for covert communication of geostationary orbit satellites provided by the present invention;
FIG. 5 is a fourth schematic flowchart of the asymmetric dynamic timeslot communication method for covert communication of geostationary orbit satellites according to the present invention;
FIG. 6 is a second schematic diagram of an asymmetric dynamic timeslot communication method for covert communication of geostationary orbit satellites according to the present invention;
FIG. 7 is a schematic structural diagram of an asymmetric dynamic timeslot communication device for covert communication of geostationary orbit satellites, provided by the present invention;
FIG. 8 is a second schematic structural diagram of an asymmetric dynamic timeslot communication device for covert communication of geostationary orbit satellites according to the present invention;
fig. 9 is a schematic structural diagram of an electronic device provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, 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.
The asymmetric dynamic time slot communication method of the concealed communication of the synchronous orbit satellite is described in the following with reference to fig. 1, 3-6.
The asymmetric dynamic timeslot communication method for blind communication of a geostationary orbit satellite proposed in this embodiment is applied to the satellite side, and the main execution unit of the asymmetric dynamic timeslot communication method for blind communication of a geostationary orbit satellite is a satellite.
The asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite is mainly applied to an application scene of emphasizing uplink data return service.
As shown in fig. 1, the asymmetric dynamic timeslot communication method for blind communication of a geostationary orbit satellite includes: step 110, step 120 and step 130.
in this step, it is understood that the terminal may be a ground terminal, and in the satellite communication process, data interaction between the satellite and other terminals is generally involved. The other terminals may be a server connected to a satellite communication, a communication device, or a user's terminal, wherein the user's terminal includes a non-mobile terminal such as a desktop computer and a mobile terminal such as a mobile phone, a tablet computer, a vehicle-mounted terminal, and a watch.
The uplink data is data uploaded by the terminal, namely data sent to the satellite by the terminal. The uplink data may include uplink service information or uplink acknowledgement.
The first uplink data is used to characterize the uplink data received by the satellite.
The target frame is a frame structure representation of the upstream data.
In the present embodiment, the satellite covert communication employs a short frame burst system, and the basic unit of communication is a frame.
By adopting a short frame burst system, the method is beneficial to improving the anti-detection capability of the system, and can shorten the total air duration of uplink and downlink signals through the maximum overlapping of the downlink time slot and the uplink time slot, thereby improving the concealment of the system.
As shown in fig. 4, in some embodiments, the target frame may include: a frame header and a data section.
In this embodiment, the frame length of the entire target frame is Tf。
The frame header belongs to the overhead part of the target frame, the accuracy of frame header information transmission determines whether the subsequent data information can be correctly received, and the frame header length is Th 。
In actual implementation, the frame header is generally transmitted at the lowest rate allowed by the system to ensure high accuracy.
The data segment contains the main information which is uploaded to the satellite by the terminal, and the length of the data segment is (T)f -Th）。
Wherein, the frame header may include: synchronizing a header, a frame identifier and a service segment; the duration of the sync header is
The duration of the frame mark is
Duration of service segment is
。
The synchronous head is used for capturing, tracking and carrier recovery of signals;
the frame mark is used for indicating the start of the frame;
the service segment is used for indicating information such as speed gear, frame length, data packet number and the like.
The data segment includes one or more packets of a target length.
The length of each data packet in the same data segment is the same and is a target length, and the target length can be customized based on a user, for example, the bit length of each data packet can be fixed to n bits, where n > 0.
It can be understood that by changing the number of data packets N in the data segment, the frame length T of the target frame can be changedfWherein N is not less than 0 and is an integer.
It should be noted that, during the transmission process, the transmission rate of the data segment may be determined based on the transmitted rate information; the number N of packets may be determined based on the frame length information of the target frame.
For example, after the frame length information of the target frame is determined, the number of packets in the data segment is adjusted based on the frame length information, so that the frame length of the target frame reaches the frame length specified by the frame length information.
The determination method of the transmission rate information and the frame length information of the target frame will be described in the following embodiments, which will not be described herein again.
According to the asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite, provided by the embodiment of the invention, the structure of the target frame is designed into a special structure, so that the target frame can be better matched with the time delay precompensation to control the time for the satellite to transmit the first downlink data, and the terminal can start to receive and process the first downlink data when the target frame corresponding to the first uplink data is just sent out, so that the utilization rate of uplink time-frequency resources is effectively improved; in addition, the frame length of the target frame can be adjusted by adjusting the number of the data packets in the target frame, so that the transmission of uplink data can be controlled by adopting the self-adaptive variable rate in the data transmission stage, and the flexibility and the reliability of data transmission are improved.
as shown in fig. 5, in this step, the time delay is pre-compensated for the duration of the time period from when the satellite receives the first uplink data to when the satellite returns the first downlink data generated based on the first uplink data to the terminal.
The time delay precompensation is used for enabling the terminal to just receive the first downlink data and process the first downlink data when the target frame corresponding to the first uplink data is sent and switched to a receiving state.
The first downlink data is data received by the terminal, that is, data received by the terminal and generated by the satellite based on the first uplink data and used for responding to the first uplink data.
The first downlink data may be downlink traffic information or response information.
In this embodiment, after receiving the first uplink data sent by the terminal, the satellite analyzes and processes the target frame corresponding to the first uplink data to generate the delay precompensation, and determines the time when the first downlink data is initiated.
The generation step of the delay pre-compensation is specifically described by the embodiment below.
As shown in fig. 6, in some embodiments, step 120 may include:
calculating a communication distance between the satellite and the terminal;
generating a propagation delay between the satellite and the terminal based on the communication distance;
and generating time delay pre-compensation based on the frame length and the propagation time delay of the target frame corresponding to the first uplink data.
In this embodiment, the communication distance is the theoretical farthest communication distance between the satellite and the ground terminal.
In actual implementation, the following formula can be used:
determining a communication distance between the satellite and the ground terminal, wherein
For the communication distance between the satellite and the ground terminal,
is the radius of the earth, h is the satellite orbit height,
is the minimum elevation angle of the satellite.
Wherein, by the formula:
the geocentric angle can be determined, wherein,
the angle of the earth's center is taken as the angle of the earth's center,
is the radius of the earth, h is the satellite orbit height,
is the minimum elevation angle of the satellite.
By the formula:
a half-view of the satellite may be determined, wherein,
the half-viewing angle is set as the half-viewing angle,
is the radius of the earth, h is the satellite orbit height,
is the minimum elevation angle of the satellite.
To obtain the geocentric angle
And half view of the satellite
Then, the minimum elevation angle of the satellite can be determined
Then based on the minimum elevation angle
The communication distance between the satellite and the ground terminal can be obtained
。
For example, in geostationary orbit the satellite parameters are: the orbit height is 35786km, and the minimum elevation angle of the satellite is 10 degrees, the orbit height can be calculated by the formula
Is at an angle of 71 DEG,
is 8.5 deg., thereby obtaining a communication distance
40586 km.
After the communication distance between the satellite and the ground terminal is obtained, based on the communication distance, the propagation delay between the satellite and the terminal can be generated.
Wherein the propagation delay is used to characterize the communication delay between the satellite and the ground terminal.
In actual implementation, the following formula can be used:
a propagation delay is determined, wherein,
1 is the signal one-way transmission delay time,
is the communication distance between the satellite and the ground terminal, and c is the speed of light.
In some embodiments, it may also be
On the basis, allowance time epsilon such as internal clock error of the terminal and other transmission estimation error time is further reserved, and certain allowance time is added to be used as a transmission delay time slot.
The margin time epsilon can be customized by a user or can be determined by testing in a real environment.
The propagation delay can be obtained by adding and summing the signal one-way transmission delay time and the margin time
。
In obtaining propagation delay
And then, calculating the frame length of a target frame corresponding to the first uplink data and the time difference of propagation delay to obtain delay precompensation.
The method can be specifically realized by the following formula:
determining a delay precompensation, wherein
In order to pre-compensate for the time delay,
is the frame length of the target frame,
in order to synchronize the duration of the header,
the duration identified for a frame is,
is the propagation delay.
In the actual implementation process, the terminal transmits to the satelliteThe radial frame length is
After the target frame corresponding to the first uplink data is acquired by the satellite, counting is started from the service section after the target frame synchronization is successful, and when the target frame corresponding to the received first uplink data is timed up
And at the moment, the satellite transmits the first downlink data to the terminal, so that the terminal starts to receive and process the first downlink data when the terminal just sends a target frame corresponding to the first uplink data.
For example, in geostationary orbit the satellite parameters are: the communication distance is calculated under the condition that the orbit height is 35786km and the minimum elevation angle of the satellite is 10 DEG
40586km, so as to calculate the signal one-way transmission delay time
Is 135ms and the margin time epsilon is determined to be 15ms through testing, the propagation delay can be determined
Is 150 ms.
When the satellite captures a target frame corresponding to the first uplink data, counting is started from the service segment after the target frame synchronization is successful, and when the target frame synchronization arrives
And at the moment, the satellite transmits the first downlink data to the terminal, so that the terminal starts to receive and process the first downlink data when the terminal just sends a target frame corresponding to the first uplink data.
In the research and development process, the inventor finds that, in the related art, dynamic adjustment of the uplink and downlink time slot switching point is mainly performed according to the ratio of the number of users to the number of uplink and downlink services to support information transmission of asymmetric services, but in the transmission mode, uplink and downlink time slots occupy independently, and for a heavy uplink data return service, the downlink time slot still occupies a certain overhead, thereby resulting in low resource utilization rate.
In the embodiment of the invention, the time of transmitting the first downlink data by the satellite is controlled by setting the time delay precompensation, namely the first downlink data is controlled to be initiated by the time delay precompensation t in advance, and the initiation time of the first downlink data is indicated by a control protocol, so that the precompensation of the propagation time delay is realized, the terminal can start to receive and process the first downlink data when a target frame corresponding to the first uplink data is just sent out, the maximum overlapping of uplink and downlink time slots is realized, the air persistence time of a signal is shortened, and the concealment of the system is improved; for data transmission emphasizing uplink data return service, the method can effectively reduce the cost occupied by the downlink time slot, and improve the utilization rate of uplink time-frequency resources, thereby improving the flexibility and rationality of resource allocation.
In this step, the first downlink data is data received by the terminal, that is, data received by the terminal and generated by the satellite based on the first uplink data for responding to the first uplink data.
The first downlink data may be downlink traffic information or response information.
The frame structure of the target frame corresponding to the first downlink data is the same as that in the above embodiment, and may include a frame header and a data segment, which are not described herein again.
The first downlink data may include instruction information for instructing the terminal to generate the second uplink data, and may include, for example, rate information for instructing the terminal to transmit the second uplink data, frame length information of a target frame corresponding to the second uplink data, power information for transmitting the second uplink data, and the like.
And the second uplink data is data which is generated by the terminal based on the first downlink data and is used for being sent to the satellite after the terminal receives the first downlink data.
The second uplink data may be new traffic information or may be the same information as traffic information corresponding to previously transmitted uplink data.
The content of the second uplink data may be determined based on the content of the first downlink data received by the terminal.
The frame structure of the target frame corresponding to the second uplink data is the same as that in the above embodiment, and may include a frame header and a data segment, which are not described herein again.
It can be understood that the first uplink data and the second uplink data are uplink data corresponding to two consecutive transmission time slots, where the second uplink data is uplink data transmitted by a next transmission time slot after the terminal transmits the first uplink data.
The rate information is a data transmission rate at which the terminal transmits the second uplink data to the satellite.
In some embodiments, the rate information may include a rate for a plurality of gears.
The frame length information is the frame length of a target frame of the second uplink data sent by the terminal to the satellite.
In addition, for uplink data transmitted by a terminal and received by the satellite at any timing, the satellite generates rate information and frame length information corresponding to the uplink data received at the next time slot based on the uplink data received at the time slot.
And then the satellite stores the rate information and the frame length information corresponding to second uplink data generated based on the first uplink data in the first downlink data and transmits the first downlink data to the terminal.
After receiving the first downlink data, the terminal analyzes the first downlink data to obtain rate information and frame length information corresponding to the second uplink data, adjusts the number of data packets in a data section in the second uplink data based on the frame length information to generate a target frame meeting the target frame length in the frame length information, and transmits the second uplink data of the target frame length to the satellite according to the target rate in the rate information.
The following describes a method for determining rate information by using a specific embodiment.
In some embodiments, the rate information is determined by:
performing signal-to-noise ratio calculation on a target frame corresponding to the first uplink data to generate a prediction result of a channel state of a next time slot;
rate information is generated based on the prediction result.
In this embodiment, the prediction result of the channel state is used to characterize the communication quality and the communication speed.
The measurement standard of the channel state is that the receiving end carries out signal-to-noise ratio estimation according to the received signal, and the estimation result is used as the prediction result of the channel state of the next time slot.
In the actual implementation process, after receiving the first uplink data, the satellite may estimate the signal-to-noise ratio of the first uplink data, and use the estimated result as a predicted result of the channel state of the next time slot to determine the rate information when the terminal transmits the second uplink data.
For example, under the condition that the prediction result is better, the gear with the higher speed is determined as the speed information corresponding to the second uplink data; and after receiving the rate information, the terminal sends the second uplink data rate to the satellite at a higher rate, so that the data transmission rate is increased.
Or under the condition that the prediction result is not good, determining the gear with lower speed as the speed information corresponding to the second uplink data; after receiving the rate information, the terminal properly reduces the rate of sending the second uplink data to the satellite to avoid the second uplink data from being lost, thereby improving the quality of data transmission.
The inventor has also found in the research and development process that, in the related art, data transmission is mainly performed at a single fixed rate, which results in poor data transmission effect and incapability of adapting to complex and variable channel states.
In the embodiment of the invention, in the data transmission stage, the transmission of uplink data is controlled by adopting the self-adaptive variable rate, the information rate and the data frame length are flexibly adjusted according to the channel state, and the dynamic allocation of time slots can be realized by adapting to the requirements of real-time changing services and the environment of a channel; when the channel environment is good, information is transmitted as much as possible so as to improve the efficiency of data transmission; when the channel environment is deteriorated, the accuracy and reliability of data transmission are guaranteed by reducing the rate of information transmission, so that the adaptability to the channel can be effectively improved, and the quality, efficiency and reliability of data transmission are improved.
For example, as shown in fig. 3, in an actual implementation process, the satellite receives a first frame transmitted by the terminal, that is, first uplink data transmitted in a current time slot.
The signal one-way transmission delay time is obtained by calculation
Is 135ms and the margin time epsilon is determined to be 15ms through testing, the propagation delay can be determined
Is 150 ms.
When the satellite captures the target frame of the first frame, counting from the service segment after the target frame synchronization is successful, and when the target frame arrives
At that moment, the satellite transmits the first downlink data to the terminal, so that the terminal starts to receive and process the first downlink data just after transmitting the first frame.
In addition, the satellite generates a prediction result of a channel state of a next slot based on a signal-to-noise ratio of a currently received first frame, and generates rate information based on the prediction result.
And generating indication information for indicating the terminal to generate the second uplink data, namely generating the indication information for indicating the terminal to generate the second frame, based on the content of the currently received first uplink data.
The satellite transmits the information to the terminal through first downlink data, wherein the first downlink data comprises indication information of whether the transmission rate is switched, whether the transmission power is changed and whether the frame length of the target frame is changed.
After receiving the first downlink data, the terminal generates second uplink data, that is, a second frame, to be sent in the next time slot based on the content of the first downlink data.
For example, in a case where the first downlink data includes indication information for determining a switching transmission rate, transmission power, or a frame length, the terminal completes framing in a new mode, generates second uplink data according to frame length information included in the first downlink data, and transmits a second frame to the satellite according to rate information included in the downlink data.
And after receiving a second frame transmitted by the satellite, the satellite updates the second frame into first uplink data in the current time slot, repeats the steps and returns the first downlink data generated based on the first uplink data to the terminal.
The first downlink data further includes acknowledgement information of the service information in the received first frame.
The acknowledgement information is used to indicate whether the terminal needs to retransmit the first uplink data sent by the first frame.
And the terminal receives a downlink response based on the second frame returned by the satellite in the process of transmitting the second frame, namely first downlink data generated by the satellite based on the second frame, wherein the first downlink data comprises confirmation of service information in the first frame, and if retransmission is needed, the terminal sends retransmission information of the first frame in a time slot of a third frame.
And if the retransmission is not needed, the terminal sends new service information in a third frame.
In the above embodiments of the present invention, a control protocol is introduced to pre-compensate the propagation delay by aiming at the asymmetric service requirement of the geostationary orbit satellite covert communication, so as to reduce the time slot resource overhead. For example, when the terminal finishes sending the uplink service and switches to the receiving state, the downlink signal just reaches the terminal, so that the waiting time for receiving the downlink signal is reduced, and the utilization rate of time-frequency resources is improved.
In addition, the transmission time delay is pre-compensated to enable the uplink time slot and the downlink time slot to be overlapped in a maximized mode, the total air duration time of the uplink signal and the downlink signal can be effectively reduced, and the concealment of the system is improved.
In addition, in the time slot resource allocation stage, the size of the service frame is adjusted according to the channel environment to ensure the data transmission, the signal-to-noise ratio estimation is introduced to estimate and predict the channel state, the information rate and the frame length of the signal are correspondingly adjusted, and the flexibility is increased.
According to the asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite, provided by the embodiment of the invention, the transmission of uplink data is controlled by adopting the self-adaptive variable rate in the data transmission stage, so that the flexibility and the reliability of data transmission are obviously improved; the time for transmitting the first downlink data by the satellite is controlled by setting time delay precompensation, so that the terminal can start to receive and process the first downlink data when a target frame corresponding to the first uplink data is just sent out, the terminal can adapt to a channel state adjustment time slot, and the asymmetric service is flexibly supported, thereby effectively improving the utilization rate of time-frequency resources, shortening the air duration of signals and improving the anti-detection capability.
According to some embodiments of the invention, prior to step 110, the method may further comprise:
satellite broadcast pilot frequency;
the method comprises the steps that a satellite receives a request signal sent by a terminal, and the request signal is generated by the terminal based on pilot frequency;
analyzing the request signal to generate a response signal;
sending a response signal to the terminal; the response signal comprises rate information and frame length information for instructing the terminal to send the first uplink data.
In this embodiment, the pilot includes information such as interference-free frequency points.
The request signal is a signal generated by the terminal for initiating an access request to the satellite.
The request signal carries information such as traffic volume.
The reply signal is a signal generated by the satellite for responding to the access request.
After the satellite receives the request signal, the spectrum sensing and the signal-to-noise ratio estimation are carried out on the request signal, information such as the traffic carried in the request signal is analyzed, and rate information and frame length information which are adaptive to the traffic and used for indicating uplink data sent by a terminal of the next time slot are generated.
The satellite generates a response signal based on the information and transmits the response signal to the terminal.
And after receiving the response signal, the terminal analyzes the response signal, generates and transmits first uplink data to the satellite based on the rate information and the frame length information in the response signal.
The satellite receives the first uplink data, enters a service transmission phase, and starts to circularly execute the step 110 and the step 120 until the service transmission is completed.
It will be appreciated that this embodiment is used in the matching phase of the satellite and terminal prior to the transmission of the traffic data.
For example, with reference to fig. 3, in an actual implementation process, the satellite periodically broadcasts a pilot, and since the satellite performs real-time spectrum sensing on the received signal, the pilot carries information such as an interference-free frequency point.
The terminal is started, receives the pilot frequency, extracts the non-interference frequency point to initiate the uplink access request signal, and the request frame carries information such as traffic and the like.
The terminal can adopt a random access or a reserved access mode, and after the access is successful, the terminal and the satellite establish time synchronization.
It should be noted that, during the access phase, the terminal may transmit the access request signal to the satellite at a default rate and frame length.
And after receiving the request signal, the satellite returns a response signal to the terminal. In the step, the satellite carries out spectrum sensing and signal-to-noise ratio estimation on the received request signal, and makes a decision by combining with the traffic, so as to indicate which speed gear and frame length are used by the terminal, and the response frame comprises adjustment information such as speed information and frame length information.
The terminal receives the response signal which is successfully accessed, starts to transmit the uplink service signal, namely, the first uplink data, and performs matching and transmission based on the rate information, the frame length information and the like indicated by the response signal during uplink.
The satellite receives the uplink backhaul service, and sends the response or downlink service data, i.e., the first downlink data, through the downlink signaling. In the process, the satellite pre-compensates the propagation delay to generate delay pre-compensation, and initiates a downlink signal based on the delay pre-compensation, that is, the terminal transmits uplink data while the satellite returns the downlink data, so that the maximum overlapping of the downlink time slot and the uplink time slot is realized, the time when the downlink signal reaches the terminal is just the time when the terminal finishes transmitting the uplink service and switches to the receiving state, and the total air duration of the uplink signal and the downlink signal is shortened.
And the terminal starts to receive and process the first downlink data when the first uplink data is just sent, and a certain protection interval is reserved after the processing is delayed.
If the satellite sends the downlink service data to the terminal, the terminal determines whether to send the uplink response or continue sending the uplink service data through the signaling according to the situation, and the rate information and the frame length information indicated by the downlink signal are matched during the uplink sending.
And if necessary, repeatedly executing the step 110 and the step 120 until the business process is ended.
It should be noted that, a fixed reserved time slot may be adopted in the access process to simplify protocol control and frame overhead; and in the phase of transmitting service data, dynamic time slot allocation can be adopted.
According to the asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite, provided by the embodiment of the invention, the speed information and the frame length information of the first uplink data used for indicating the terminal to send the first frame of service information are generated by the satellite based on the received request signal in the matching stage before service transmission, so that the time slot dynamic allocation based on the real-time changing service requirement and the channel environment can be realized, and the flexibility and the reliability of data transmission are improved. The following describes the asymmetric dynamic timeslot communication device for covert communication of a geostationary orbit satellite according to the present invention, and the following described asymmetric dynamic timeslot communication device for covert communication of a geostationary orbit satellite and the above described asymmetric dynamic timeslot communication method for covert communication of a geostationary orbit satellite can be referred to correspondingly.
The asymmetric dynamic timeslot communication device for covert communication of a synchronous orbit satellite is applied to a satellite.
As shown in fig. 7, the asymmetric dynamic timeslot communication apparatus for blind communication of a geostationary orbit satellite includes: a first receiving module 710, a first generating module 720 and a first transmitting module 730.
A first receiving module 710, configured to receive a target frame corresponding to first uplink data sent by a terminal;
a first generating module 720, configured to generate time delay pre-compensation information based on a target frame corresponding to the first uplink data;
a first sending module 730, configured to send, to the terminal, first downlink data for responding to a target frame corresponding to the first uplink data based on the delay precompensation information; wherein the content of the first and second substances,
the first downlink data comprises rate information and frame length information used for indicating the terminal to send the second uplink data;
the time delay precompensation information is used for enabling the terminal to receive the first downlink data when the target frame corresponding to the first uplink data is sent and the terminal is switched to a receiving state.
According to the asymmetric dynamic time slot communication device for the covert communication of the synchronous orbit satellite, provided by the embodiment of the invention, the transmission of uplink data is controlled by adopting the self-adaptive variable rate in the data transmission stage, so that the flexibility and the reliability of data transmission are obviously improved; and the time for transmitting the first downlink data by the satellite is controlled by setting time delay precompensation, so that the terminal can start to receive and process the first downlink data when a target frame corresponding to the first uplink data is just sent out, and the utilization rate of uplink time-frequency resources is effectively improved.
In some embodiments, the first generating module 720 may further be configured to:
calculating the farthest communication distance between the satellite and the terminal;
generating a propagation delay between the satellite and the terminal based on the farthest communication distance;
and generating time delay pre-compensation information based on the time length and the propagation time delay of the target frame corresponding to the first uplink data.
In some embodiments, the apparatus may further include a second generating module to:
performing signal-to-noise ratio calculation on a target frame corresponding to the first uplink data to generate a prediction result of a channel state of a next time slot;
rate information is generated based on the prediction result.
In some embodiments, the apparatus may further comprise:
the first broadcast module is used for broadcasting the pilot frequency before receiving a target frame corresponding to first uplink data sent by a terminal;
a third receiving module, configured to receive a request signal sent by a terminal, where the request signal is generated by the terminal based on a pilot frequency;
the third generation module is used for analyzing the request signal and generating a response signal;
the third sending module is used for sending a response signal to the terminal; the response signal comprises rate information and frame length information for instructing the terminal to send the first uplink data.
In some embodiments, the target frame comprises: the frame header and the data section are combined,
the transmission rate of the data segment is determined based on the rate information;
the data segment includes at least one data packet of a target length, and the number of the data packets is determined based on the frame length information.
Another asymmetric dynamic timeslot communication method for covert communication of a geostationary orbit satellite according to the present invention is described below with reference to fig. 2 to 6, and the following asymmetric dynamic timeslot communication method for covert communication of a geostationary orbit satellite and the above asymmetric dynamic timeslot communication method for covert communication of a geostationary orbit satellite can be referred to correspondingly.
It should be noted that the asymmetric dynamic timeslot communication method for hidden communication of a geostationary orbit satellite described below is applied to a terminal, and an execution subject of the method is a terminal, where the terminal may be a non-mobile terminal such as a computer or a server, or may also be a mobile terminal including, but not limited to, a mobile phone, a tablet computer, a vehicle-mounted terminal, or a watch.
As shown in fig. 2, the asymmetric dynamic timeslot communication method for blind communication of a geostationary orbit satellite includes: step 210 and step 220.
Step 210, the terminal receives first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information for indicating the terminal to send second uplink data;
in this step, the first downlink data is data received by the terminal, that is, data received by the terminal and generated by the satellite based on the first uplink data for responding to the first uplink data.
The first downlink data may be downlink traffic information or response information.
The first downlink data comprises rate information and frame length information for instructing the terminal to send the second uplink data.
The method for determining the rate information and the frame length information has been described in the above embodiments, and is not described herein again.
In some embodiments, the first downlink data further includes acknowledgement information indicating whether the terminal needs to retransmit the first uplink data transmitted in the last slot.
The second uplink data is data transmitted by the terminal to the satellite in the next time slot, and the second uplink data may be service information.
The second uplink data may be new service information based on the acknowledgement information in the first downlink data transmitted by the satellite, or may be service information transmitted by the terminal to the satellite in a time slot previous to the current time slot.
And step 220, the terminal sends a target frame corresponding to the second uplink data to the satellite based on the first downlink data.
In this step, the frame structure of the target frame corresponding to the second uplink data is similar to the frame structure of the target frame corresponding to the first uplink data, and may include a frame header and a data segment.
And the frame length of the target frame corresponding to the second uplink data is determined based on the frame length information in the first downlink data.
The data transmission rate at which the terminal transmits the second uplink data to the satellite is determined based on the rate information in the first downlink data.
The specific content of the second uplink data is determined based on the acknowledgement information in the first downlink data of the last time slot received by the terminal.
For example, when the acknowledgment information in the first downlink data received in the previous time slot is the service information that needs to be retransmitted, the terminal determines the second uplink data sent in the current time slot as the service information sent in the previous time slot.
And if the confirmation information is that retransmission is not needed, the terminal determines the second uplink data sent by the current time slot as new service information.
According to the asymmetric dynamic time slot communication method for the covert communication of the synchronous orbit satellite, which is provided by the embodiment of the invention, the transmission of uplink data is controlled by adopting the self-adaptive variable rate in the data transmission stage, so that the flexibility and the reliability of data transmission can be obviously improved.
In some embodiments, step 220 may further comprise:
the terminal processes the first downlink data to generate second uplink data;
and after the terminal finishes processing the first uplink data target time length, sending a target frame corresponding to second uplink data to the satellite.
In this embodiment, the target duration is the guard interval.
The target duration may be determined based on the measured results.
In the actual execution process, after the terminal processes the first uplink data, a certain guard interval may be reserved, that is, after the target duration, the second uplink data is sent to the satellite.
The satellite receives the second uplink data and starts to execute step 120, and the specific implementation steps are already described in the above embodiments and are not described herein again.
In this embodiment, by setting the guard interval, data loss can be avoided, and the reliability of data transmission is improved.
The following describes the asymmetric dynamic timeslot communication device for covert communication of a geostationary orbit satellite according to the present invention, and the following described asymmetric dynamic timeslot communication device for covert communication of a geostationary orbit satellite and the above described asymmetric dynamic timeslot communication method for covert communication of a geostationary orbit satellite can be referred to correspondingly.
The asymmetric dynamic timeslot communication device for the geostationary orbit satellite covert communication is applied to a terminal.
As shown in fig. 8, the asymmetric dynamic timeslot communication apparatus for blind communication of a geostationary orbit satellite includes: a second receiving module 810 and a second transmitting module 820.
A second receiving module 810, configured to receive first downlink data sent by a satellite, where the first downlink data includes rate information and frame length information used for instructing a terminal to send second uplink data;
and a second sending module 820, configured to send, to the satellite, a target frame corresponding to the second uplink data based on the first downlink data.
According to the asymmetric dynamic time slot communication device for the covert communication of the synchronous orbit satellite, which is provided by the embodiment of the invention, the transmission of uplink data is controlled by adopting the self-adaptive variable rate in the data transmission stage, so that the flexibility and the reliability of data transmission can be obviously improved.
In some embodiments, the apparatus may further comprise:
the fourth generation module is used for processing the first downlink data and generating second uplink data;
the second sending module 820 may further be configured to send a target frame corresponding to the second uplink data to the satellite after the processing of the first downlink data target duration is completed.
Fig. 9 illustrates a physical structure diagram of an electronic device, and as shown in fig. 9, the electronic device may include: a processor (processor)910, a communication Interface (Communications Interface)920, a memory (memory)930, and a communication bus 940, wherein the processor 910, the communication Interface 920, and the memory 930 communicate with each other via the communication bus 940. Processor 910 may invoke logic instructions in memory 930 to perform an asymmetric dynamic timeslot communication method for geostationary orbit satellite covert communication, the method comprising: receiving a target frame corresponding to first uplink data sent by a terminal; generating time delay pre-compensation information based on a target frame corresponding to the first uplink data; based on the time delay precompensation information, sending first downlink data for responding to a target frame corresponding to the first uplink data to the terminal; the first downlink data comprises rate information and frame length information used for indicating the terminal to send the second uplink data; the delay precompensation information is used for enabling the terminal to receive the first downlink data when the terminal finishes sending the target frame corresponding to the first uplink data and switches to a receiving state, or the method comprises the following steps: receiving first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information for indicating a terminal to send second uplink data; and based on the first downlink data, sending a target frame corresponding to the second uplink data to the satellite.
Furthermore, the logic instructions in the memory 930 may be implemented in software functional units and stored in a computer readable storage medium when the logic instructions are sold or used as independent products. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes 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 invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In another aspect, the present invention also provides a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the asymmetric dynamic timeslot communication method for geostationary orbit satellite covert communication provided by the above methods, the method comprising: receiving a target frame corresponding to first uplink data sent by a terminal; generating time delay pre-compensation information based on a target frame corresponding to the first uplink data; based on the time delay precompensation information, sending first downlink data for responding to a target frame corresponding to the first uplink data to the terminal; the first downlink data comprises rate information and frame length information used for indicating the terminal to send the second uplink data; the delay precompensation information is used for enabling the terminal to receive the first downlink data when the terminal finishes sending the target frame corresponding to the first uplink data and switches to a receiving state, or the method comprises the following steps: receiving first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information for indicating a terminal to send second uplink data; and based on the first downlink data, sending a target frame corresponding to the second uplink data to the satellite.
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program that when executed by a processor implements an asymmetric dynamic timeslot communication method for performing geostationary orbit satellite covert communication as each of the above provides, the method comprising: receiving a target frame corresponding to first uplink data sent by a terminal; generating time delay pre-compensation information based on a target frame corresponding to the first uplink data; based on the time delay precompensation information, sending first downlink data for responding to a target frame corresponding to the first uplink data to the terminal; the first downlink data comprises rate information and frame length information used for indicating the terminal to send the second uplink data; the delay precompensation information is used for enabling the terminal to receive the first downlink data when the terminal finishes sending the target frame corresponding to the first uplink data and switches to a receiving state, or the method comprises the following steps: receiving first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information for indicating a terminal to send second uplink data; and based on the first downlink data, sending a target frame corresponding to the second uplink data to the satellite.
The above-described embodiments of the apparatus are merely illustrative, and 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 modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An asymmetric dynamic time slot communication method for covert communication of a synchronous orbit satellite is characterized by comprising the following steps:
receiving a target frame corresponding to first uplink data sent by a terminal;
generating time delay precompensation based on a target frame corresponding to the first uplink data;
based on the time delay precompensation, sending first downlink data for responding to a target frame corresponding to the first uplink data to the terminal; wherein the content of the first and second substances,
the first downlink data comprises rate information and frame length information for indicating the terminal to send second uplink data;
and the time delay precompensation is used for enabling the terminal to receive the first downlink data when the target frame corresponding to the first uplink data is sent and the receiving state is switched.
2. The asymmetric dynamic timeslot communication method for hidden communication of geostationary orbit satellite of claim 1, wherein said generating a delay pre-compensation based on the target frame corresponding to the first uplink data comprises:
calculating a communication distance between the satellite and the terminal;
generating a propagation delay between a satellite and the terminal based on the communication distance;
and generating the delay precompensation based on the frame length of the target frame corresponding to the first uplink data and the propagation delay.
3. The asymmetric dynamic timeslot communication method for geostationary orbit satellite covert communication according to claim 1 or 2, wherein said rate information is determined by:
performing signal-to-noise ratio calculation on a target frame corresponding to the first uplink data to generate a prediction result of a channel state of a next time slot;
generating the rate information based on the prediction result.
4. The asymmetric dynamic timeslot communication method for hidden communication of geostationary orbit satellite according to claim 1 or 2, wherein before the target frame corresponding to the first uplink data transmitted by said receiving terminal, said method includes:
broadcasting a pilot frequency;
receiving a request signal sent by the terminal, wherein the request signal is generated by the terminal based on the pilot frequency;
analyzing the request signal to generate a response signal;
sending the response signal to the terminal; wherein, the response signal includes rate information and frame length information for instructing the terminal to send the first uplink data.
5. The asymmetric dynamic timeslot communication method for geostationary orbit satellite covert communication according to claim 1 or 2, wherein said target frame comprises: the frame header and the data section are combined,
a transmission rate of the data segment is determined based on the rate information;
the data segment includes at least one data packet of a target length, and the number of the data packets is determined based on the frame length information.
6. An asymmetric dynamic time slot communication method for covert communication of a synchronous orbit satellite is characterized by comprising the following steps:
receiving first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information for indicating a terminal to send second uplink data;
and sending a target frame corresponding to the second uplink data to the satellite based on the first downlink data.
7. The asymmetric dynamic timeslot communication method for blind communication of geostationary orbiting satellites of claim 6 wherein said transmitting a target frame corresponding to said second uplink data to said satellites based on said first downlink data comprises:
processing the first downlink data to generate second uplink data;
and after the first uplink data target time length is processed, sending a target frame corresponding to the second uplink data to the satellite.
8. An asymmetric dynamic timeslot communication device for covert communication of geostationary orbiting satellites, comprising:
the first receiving module is used for receiving a target frame corresponding to first uplink data sent by a terminal;
a first generating module, configured to generate a delay precompensation based on a target frame corresponding to the first uplink data;
a first sending module, configured to send, to the terminal, first downlink data for responding to a target frame corresponding to the first uplink data based on the delay precompensation; wherein the content of the first and second substances,
the first downlink data comprises rate information and frame length information for indicating the terminal to send second uplink data;
and the time delay precompensation is used for enabling the terminal to receive the first downlink data when the target frame corresponding to the first uplink data is sent and the receiving state is switched.
9. An asymmetric dynamic timeslot communication device for covert communication of geostationary orbiting satellites, comprising:
the second receiving module is used for receiving first downlink data sent by a satellite, wherein the first downlink data comprises rate information and frame length information used for indicating a terminal to send second uplink data;
and a second sending module, configured to send, to the satellite, a target frame corresponding to the second uplink data based on the first downlink data.
10. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor when executing the program implements the steps of the asymmetric dynamic time slot communication method for geostationary orbiting satellite covert communication according to any one of claims 1 to 7.
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