CN113452399B - Satellite-borne receiver demodulation multiplexing method and device, electronic equipment and storage medium - Google Patents
Satellite-borne receiver demodulation multiplexing method and device, electronic equipment and storage medium Download PDFInfo
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Abstract
The application provides a demodulation multiplexing method and device for a satellite-borne receiver, electronic equipment and a storage medium. The method comprises the following steps: receiving a spread spectrum signal sent by a user, capturing a pilot frequency band of the spread spectrum signal, and distinguishing the user according to a spread spectrum code in the pilot frequency band; dividing the service segment of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence; after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user; dividing the data segment of the user with the same or similar communication speed into a plurality of sub data segments for caching, and demodulating the cached sub service segment data in sequence. The method and the device can realize real-time demodulation of different services of multiple users on the satellite, and consume less resources.
Description
Technical Field
The application relates to the technical field of satellite communication, in particular to a demodulation multiplexing method and device of a satellite-borne receiver, electronic equipment and a storage medium.
Background
Low earth orbit satellite communication systems are one of the more and more widely used communication systems in recent years. Compared with high and medium orbit satellites, the low orbit satellite communication system has shorter transmission distance than other communication systems, thereby not only reducing the transmitter power of the ground terminal, but also ensuring the low time delay of information transmission. In order to cater to the fifth-generation mobile communication technology 5G (five-generation) era, short-frame burst communication based on a low-earth orbit satellite networking has high flexibility, and a large number of users access the satellite networking at the same time to complete different services. There is therefore a need for a scheme that can accommodate simultaneous demodulation by multiple users to handle the large number of users that may have simultaneous access to a low-earth orbit satellite communication system.
In the prior art, the requirement of simultaneous demodulation of multiple users is met by increasing the number of demodulation modules, but the on-satellite computing resources, storage resources and energy supply are severely limited due to the fact that the volume, weight and power consumption of low-orbit satellite communication loads need to be strictly controlled. Therefore, when the method is applied to multiple users, it is not preferable to directly adopt a method of adding a demodulation module, which not only occupies a large amount of storage resources, but also increases demodulation delay, and has low estimation accuracy on frequency offset.
Disclosure of Invention
Due to the above problems in the conventional methods, embodiments of the present application provide a demodulation multiplexing method and apparatus for a satellite borne receiver, an electronic device, and a storage medium.
Specifically, the embodiment of the present application provides the following technical solutions:
in a first aspect, an embodiment of the present application provides a demodulation multiplexing method for a satellite-borne receiver, including:
receiving a spread spectrum signal sent by a user, capturing a pilot frequency band of the spread spectrum signal, and distinguishing the user according to a spread spectrum code in the pilot frequency band;
dividing the service segment of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence;
after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user;
dividing the data segment of the user with the same or similar communication speed into a plurality of sub data segments for caching, and demodulating the cached sub data segments in sequence. Optionally, the sequentially demodulating the cached sub-service segment data includes:
and sequentially demodulating the sub-service segment data of each user according to the sequence of the current sub-service segment cache by the user.
Optionally, the sequentially demodulating the cached sub-data segment data includes:
and sequentially demodulating the sub-data segment data of each user according to the sequence of the current sub-data segment cache by the user.
Optionally, the method further includes:
determining the number of local processing clocks from the first symbol of the current sub-service segment data of each user to the first symbol of the next sub-service segment data of each user according to the transmitting rate of the service segment and the rate of the local processing clock of the field programmable gate array FPGA;
and determining the number of users processed by the satellite borne receiver in the time for demodulating each piece of service segment data according to the number of local processing clocks existing between two symbols and the number of local processing clocks consumed for demodulating the current sub-service segment data of one user.
Optionally, the method further includes:
determining the number of local processing clocks from the first symbol of the current sub-data segment data of each user to the first symbol of the next sub-data segment data of each user according to the transmission rate of the service segment and the rate of the local processing clock of the Field Programmable Gate Array (FPGA);
and determining the number of users processed by the satellite-borne receiver in the time for demodulating each piece of data according to the number of local processing clocks existing between two symbols and the number of local processing clocks consumed for demodulating the current sub-data piece data of one user.
In a second aspect, an embodiment of the present application provides a demodulation and multiplexing apparatus for a satellite-borne receiver, including:
the first processing module is used for receiving a spread spectrum signal sent by a user and capturing a pilot frequency band of the spread spectrum signal so as to distinguish the user according to a spread spectrum code in the pilot frequency band;
the second processing module is used for dividing the service segments of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence;
the third processing module is used for determining the communication rate of the user according to the user transmission service indicated by the service segment of the user after the demodulation of the service segment data of the user is finished;
and the fourth processing module is used for dividing the data segment of the user with the same or similar communication speed into a plurality of sub-data segments for caching, and demodulating the cached sub-data segment data in sequence. Optionally, the second processing module is specifically configured to:
and sequentially demodulating the sub-service segment data of each user according to the sequence of the current sub-service segment cache by the user.
In a third aspect, an embodiment of the present application further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor executes the program to implement the steps of the method for demultiplexing and multiplexing in a satellite-borne receiver according to the first aspect.
In a fourth aspect, the present application further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of the satellite-borne receiver demodulation multiplexing method according to the first aspect.
In a fifth aspect, this application further provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the method for demultiplexing and multiplexing a satellite-borne receiver according to the first aspect described above are implemented.
According to the technical scheme, the embodiment of the application firstly receives the spread spectrum signal sent by the user and captures the pilot frequency band of the spread spectrum signal so as to distinguish the user according to the spread spectrum code in the pilot frequency band. Then, for the demodulation of the user service segment, the service segment of each user is divided into a plurality of sub-service segments for caching, and the cached sub-service segment data is demodulated in sequence. And after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user. And then dividing the data segment of the user with the same or similar communication speed into a plurality of sub-data segments for caching, and demodulating the cached sub-service segment data in sequence. Therefore, the embodiment of the application provides a manner similar to time division multiplexing to perform multi-user real-time demodulation, buffer different service demodulation operation segments transmitted by multiple users, and demodulate each segment of buffered data in sequence. The embodiment of the application can meet the requirement of simultaneously demodulating different services of multiple users, fully utilizes on-satellite processing resources, flattens a large amount of data needing parallel processing, and reduces resources needed by multiple users by repeatedly utilizing the same demodulation module.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart illustrating steps of a demodulation multiplexing method for a satellite-borne receiver according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a demodulation processing sequence of a satellite-borne receiver according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a demodulation output signal sequence of a satellite-borne receiver according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a demodulation apparatus of a satellite-borne receiver provided in an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of steps of a demodulation multiplexing method of a satellite borne receiver according to an embodiment of the present application, fig. 2 is a schematic diagram of a demodulation processing sequence of the satellite borne receiver according to the embodiment of the present application, and fig. 3 is a schematic diagram of a demodulation output signal sequence of the satellite borne receiver according to the embodiment of the present application. The demodulation method of the satellite-borne receiver provided by the embodiment of the present application is explained and explained in detail below with reference to fig. 1 to 3.
As shown in fig. 1, a demodulation method of a satellite-borne receiver provided in an embodiment of the present application includes:
step 101: receiving a spread spectrum signal sent by a user, capturing a pilot frequency band of the spread spectrum signal, and distinguishing the user according to a spread spectrum code in the pilot frequency band;
in this step, it should be noted that, the embodiment of the present application is applied to a receiver of a low earth orbit satellite, and an end user transmits a spread spectrum signal to the low earth orbit satellite through a specific user frame structure, and the low earth orbit satellite receiver receives the spread spectrum signal. The user frame comprises a pilot segment, a service segment and a data segment; the pilot frequency band adopts different spread spectrum codes to carry out direct spread communication so as to distinguish different users according to the spread spectrum codes in the capturing stage and distribute channels for the users according to the current channel state; the service segment is used for indicating the information of the frame, and the mode of the receiver can be changed according to the information of the frame, so that signals with different services and different rates are received and demodulated; the data segment is the data that the user needs to transmit, the service requirements of this segment of data are different, and the transmission rate and the length thereof are also greatly different. It should be noted that the data transmission length and rate of the service segments of different users are constant, so that a specific demodulation receiver or demodulation receivers can be used to demodulate the service segments of all users, and then the corresponding demodulation receiver is selected to demodulate according to the data segment rate of the user.
Step 102: dividing the service segment of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence;
in this step, as shown in fig. 2, after the users are distinguished, the service segments of the respective users are divided into a plurality of sub-service segments and cached. When a user completes the buffer storage of the current sub-service segment, the data of the sub-service segment is demodulated, and the time delay for processing the data is considered to be short, and the processing speed is far faster than the speed for fully storing the buffer data. For a plurality of users, after each user caches a segment of data, the user needs to wait for a certain time to store the next segment of data to be processed. Therefore, during the period, one receiver can be time division multiplexed, and the buffered data of a plurality of users can be demodulated in sequence. It should be noted that the whole process of demodulating the user data needs to be completed before all sub-segment data of the next segment of data of the user is received, so that it is ensured that when the sub-service segment data currently cached by each user is processed, the buffer is not fully stored in the next segment of data, and the current segment of data is processed, thereby avoiding the problem that the demodulation result is caused by data overflow and loss in the demodulation process.
Step 103: after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user;
in this step, after the demodulation of the service segment data of the user is completed, the demodulation of the user data segment is ready to be started, and the data segment rate and the length are different because the transmission service of each user is different. Therefore, data segments for different users are firstly grouped according to the user transmission service indicated by the service segments, users with similar or same rate are grouped, and a demodulation receiver is shared.
Step 104: dividing the data segment of the user with the same or similar communication speed into a plurality of sub data segments for caching, and demodulating the cached sub data segments in sequence.
In this step, for users with the same or similar communication rate, the data segment is divided into a plurality of sub-data segments for buffering, and after a user completes the data buffering of one sub-data segment, the sub-data segment is demodulated. It should be noted that the whole process of demodulating the user data needs to be completed before all sub-segment data of the next segment of data of the user is received, so that it is ensured that when sub-segment data currently cached by each user is processed, the buffer is not filled with the next segment of data, and the current segment of data is processed, thereby avoiding the problem that the demodulation result occurs due to data overflow and loss in the demodulation process.
It should be noted that, in the conventional demodulation method, all user data needs to be cached offline, and then the offline cached data is compensated according to the frequency offset and the phase estimated by the local search or FFT method, and a large amount of resources are consumed for demodulation of a single user by using the method. For multi-user demodulation, it is not preferable that the conventional method directly adopts a method of adding a demodulation module. The embodiment of the application provides a demodulation multiplexing method of 'fast and slow playing'. The embodiment of the application is similar to a time division multiplexing method, different service demodulation operations transmitted by a plurality of users are cached in a segmented mode, and then each segment of data is demodulated in a segmented mode. Since the data rate to be demodulated is very slow compared to the clock of the satellite processing load, the data of multiple users can be processed separately in the time slot when several symbols arrive.
According to the technical scheme, the embodiment of the application firstly receives the spread spectrum signal sent by the user and captures the pilot frequency band of the spread spectrum signal so as to distinguish the user according to the spread spectrum code in the pilot frequency band. Then, for the demodulation of the user service segment, the service segment of each user is divided into a plurality of sub-service segments for caching, and the cached sub-service segment data is demodulated in sequence. And after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user. And then dividing the data segment of the user with the same or similar communication speed into a plurality of sub-data segments for caching, and demodulating the cached sub-service segment data in sequence. Therefore, the embodiment of the application provides a manner similar to time division multiplexing to perform multi-user real-time demodulation, buffer different service demodulation operation segments transmitted by multiple users, and demodulate each segment of buffered data in sequence. The embodiment of the application can meet the requirement of simultaneously demodulating different services of multiple users, fully utilizes on-satellite processing resources, flattens a large amount of data needing parallel processing, and reduces resources needed by multiple users by repeatedly utilizing the same demodulation module.
Based on the content of the foregoing embodiment, in this embodiment, the sequentially demodulating the cached sub-service segment data includes:
and sequentially demodulating the sub-service segment data of each user according to the sequence of the current sub-service segment cache by the user.
Based on the content of the foregoing embodiment, in this embodiment, the sequentially demodulating the cached sub-data segments includes:
and sequentially demodulating the sub-data segment data of each user according to the sequence of the current sub-data segment cache by the user.
Based on the content of the foregoing embodiment, in this embodiment, the method further includes:
determining the number of local processing clocks from the first symbol of the current sub-service segment data of each user to the first symbol of the next sub-service segment data of each user according to the transmitting rate of the service segment and the rate of the local processing clock of the field programmable gate array FPGA;
and determining the number of users processed by the satellite borne receiver in the time for demodulating each piece of service segment data according to the number of local processing clocks existing between two symbols and the number of local processing clocks consumed for demodulating the current sub-service segment data of one user.
In this embodiment, it should be noted that, for data sent by multiple users, after successful acquisition, the receiver allocates channels to the users for data buffering, and then performs frame synchronization on the channels in sequence. Because the transmission rate of the service segment data is constant, the number of local processing clocks between the first symbol of the current sub-service segment data of each user and the first symbol of the next sub-service segment data of each user can be determined according to the transmission rate of the service segment and the rate of the local processing clock of the field programmable gate array FPGA. And further determining the number of users which can be processed by the satellite-borne receiver in the time for demodulating the data of each service segment according to the number of local processing clocks existing between the two symbols and the number of local processing clocks consumed for demodulating the data of the current sub-service segment of one user.
For example, when the symbol rate is 2ksps and the FPGA local processing clock is 150M/s, the number of clocks between two symbols is 150M/200k =75000 clocks. If the receiver needs 5000 clocks to demodulate one user, 75000/5000=15 users can be processed simultaneously between two symbols.
Based on the content of the foregoing embodiment, in this embodiment, the method further includes:
determining the number of local processing clocks from the first symbol of the current sub-data segment data of each user to the first symbol of the next sub-data segment data of each user according to the transmission rate of the service segment and the rate of the local processing clock of the Field Programmable Gate Array (FPGA);
and determining the number of users which can be processed by the satellite-borne receiver in the time for demodulating each piece of data according to the number of local processing clocks existing between two symbols and the number of local processing clocks consumed for demodulating the current sub-data piece data of one user.
The following is illustrated by specific examples:
the first embodiment is as follows:
in this embodiment, the states of all demodulation receivers are detected first, and all demodulation receivers in idle states are found and numbered; the captured users are then despread, assigned their user IDs, and frame synchronized.
In the present embodiment, the service segment of the user to which the ID has been assigned is subjected to segment demodulation. The specific method is that the service segment of the user is divided into a plurality of segments to be cached. The delay for the demodulation receiver to process each segment of demodulated data is required to be no greater than (or much less than) the time it takes to receive the first symbol of the next segment of data. Therefore, the situation that the buffer is full of the next piece of data and the piece of data is still processed can be ensured when the received piece of data is processed. The above situation may cause data overflow loss in the demodulation process, resulting in a problem in the demodulation result.
In this embodiment, each piece of buffered data is processed, and at this time, the time delay for processing the data is considered to be short, and the processing speed is far faster than the speed at which the buffered data is full. For a plurality of users, after each user caches a segment of data, the user needs to wait for a certain time to store the next segment of data to be processed. Therefore, during the period, one receiver can be time division multiplexed, and the buffered data of a plurality of users can be demodulated in sequence.
In this embodiment, after the service segment demodulation is completed, the data segment rate and length of each user are different. The data segments for different users are firstly grouped according to the service segment information thereof: users with the same or close rate are grouped into a group and share one demodulation receiver. For higher rate users, the time to buffer a piece of data is relatively short, and therefore the data that can be demodulated by each receiver is also reduced.
In this embodiment, the grouped users are buffered according to the buffered data lengths corresponding to different rates, and the buffered data are sequentially demodulated. The specific method and principle are similar to the service segment demodulation, and are not described in detail here.
Example two:
in this embodiment, assume that the on-board demodulator processes clocks as
At a data symbol rate of
The clock delay required by the demodulation module for processing is N; after the service segment data is segmented, each segment of data is 64 bits, and the data segments of data can be segmented according to different numbers according to different data rates. In this embodiment, for example, 2Ksps is taken as a boundary, a part smaller than 2Ksps is segmented by 256 bits per segment, and a part larger than or equal to 2Ksps is segmented by 128 bits.
In this embodiment, for data sent by user 1, user 2, or even more users, the receiver allocates channels for the data after successful acquisition to perform data buffering, and then performs frame synchronization processing on the data in sequence. Because the data transmission rate of the service segment is constant, the number of local processing clocks between the first symbol for receiving the current sub-data segment data of each user and the first symbol for receiving the next sub-data segment data of each user can be determined according to the transmission rate of the service segment and the rate of a local processing clock of a Field Programmable Gate Array (FPGA); and then according to the number of local processing clocks existing between two symbols and the number of local processing clocks consumed by demodulating the current sub-data segment data of one user, determining the number of users which can be processed by the satellite-borne receiver in the time of demodulating each segment of data segment data, and carrying out reasonable multiplexing and planning on the users.
In this embodiment, the data segment portion of each user needs to be divided according to different rates depending on the information of the service segment. Because the search templates corresponding to different rates are different, the segmented data cannot be directly demodulated, and the templates need to be reasonably adjusted according to the rates. Therefore, the data segment demodulation control signal is more complicated than the service segment, but the demodulation operation module and the template are multiplexed, so a large amount of resources can be saved.
Therefore, the on-satellite multi-user real-time demodulation can be realized, compared with the prior art that multi-user simultaneous demodulation is realized by increasing the number of receivers, the on-satellite multi-user real-time demodulation method adopts a time division multiplexing method, achieves fast and slow speed, fully utilizes on-satellite processing resources, flattens a large amount of data needing parallel processing, and reduces resources required by multiple users by repeatedly utilizing the same module.
Based on the same inventive concept, another embodiment of the present invention provides a demodulation and multiplexing apparatus for a satellite-borne receiver, as shown in fig. 4, the apparatus includes:
the system comprises a first processing module 1, a second processing module and a third processing module, wherein the first processing module is used for receiving a spread spectrum signal sent by a user and capturing a pilot frequency band of the spread spectrum signal so as to distinguish the user according to a spread spectrum code in the pilot frequency band;
the second processing module 2 is used for dividing the service segments of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence;
the third processing module 3 is used for determining the communication rate of the user according to the user transmission service indicated by the service segment of the user after the demodulation of the service segment data of the user is finished;
and the fourth processing module 4 is configured to divide the data segment of the user with the same or similar communication rate into a plurality of sub-data segments for caching, and sequentially demodulate the cached sub-data segments. In this embodiment, it should be noted that the embodiments of the present application are applied to a receiver of a low earth orbit satellite, and an end user transmits a spread spectrum signal to the low earth orbit satellite through a specific user frame structure, and the low earth orbit satellite receiver receives the spread spectrum signal. The user frame comprises a pilot segment, a service segment and a data segment; the pilot frequency band adopts different spread spectrum codes to carry out direct spread communication so as to distinguish different users according to the spread spectrum codes in the capturing stage and distribute channels for the users according to the current channel state; the service segment is used for indicating the information of the frame, and the mode of the receiver can be changed according to the information of the frame, so that signals with different services and different rates are received and demodulated; the data segment is the data that the user needs to transmit, the service requirements of this segment of data are different, and the transmission rate and the length thereof are also greatly different. It should be noted that the data transmission length and rate of the service segments of different users are constant, so that a specific demodulation receiver or demodulation receivers can be used to demodulate the service segments of all users, and then the corresponding demodulation receiver is selected to demodulate according to the data segment rate of the user.
In this embodiment, as shown in fig. 2, after the users are distinguished, the service segments of the respective users are divided into a plurality of sub-service segments for caching. When a user completes the buffer storage of the current sub-service segment, the data of the sub-service segment is demodulated, and the time delay for processing the data is considered to be short, and the processing speed is far faster than the speed for fully storing the buffer data. For a plurality of users, after each user caches a segment of data, the user needs to wait for a certain time to store the next segment of data to be processed. Therefore, during the period, one receiver can be time division multiplexed, and the buffered data of a plurality of users can be demodulated in sequence. It should be noted that the whole process of demodulating the user data needs to be completed before all sub-segment data of the next segment of data of the user is received, so that it is ensured that when the sub-service segment data currently cached by each user is processed, the buffer is not fully stored in the next segment of data, and the current segment of data is processed, thereby avoiding the problem that the demodulation result is caused by data overflow and loss in the demodulation process.
In this embodiment, after the demodulation of the service segment data of the user is completed, the demodulation of the user data segment is ready to be started, and the data segment rate and the length are different for each user due to the difference of the transmission service. Therefore, data segments for different users are firstly grouped according to the user transmission service indicated by the service segments, users with similar or same rate are grouped, and a demodulation receiver is shared.
In this embodiment, for users with the same or similar communication rate, the data segment of the user is first divided into a plurality of sub-data segments for buffering, and after a user completes the data buffering of one sub-data segment, the user demodulates the data segment. It should be noted that the whole process of demodulating the user data needs to be completed before all sub-segment data of the next segment of data of the user is received, so that it is ensured that when sub-segment data currently cached by each user is processed, the buffer is not filled with the next segment of data, and the current segment of data is processed, thereby avoiding the problem that the demodulation result occurs due to data overflow and loss in the demodulation process.
It should be noted that, in the conventional demodulation method, all user data needs to be cached offline, and then the offline cached data is compensated according to the frequency offset and the phase estimated by the local search or FFT method, and a large amount of resources are consumed for demodulation of a single user by using the method. For multi-user demodulation, it is not preferable that the conventional method directly adopts a method of adding a demodulation module. The embodiment of the application provides a demodulation multiplexing method of 'fast and slow playing'. The embodiment of the application is similar to a time division multiplexing method, different service demodulation operations transmitted by a plurality of users are cached in a segmented mode, and then each segment of data is demodulated in a segmented mode. Since the data rate to be demodulated is very slow compared to the clock of the satellite processing load, the data of multiple users can be processed separately in the time slot when several symbols arrive.
According to the technical scheme, the embodiment of the application firstly receives the spread spectrum signal sent by the user and captures the pilot frequency band of the spread spectrum signal so as to distinguish the user according to the spread spectrum code in the pilot frequency band. Then, for the demodulation of the user service segment, the service segment of each user is divided into a plurality of sub-service segments for caching, and the cached sub-service segment data is demodulated in sequence. And after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user. And then dividing the data segment of the user with the same or similar communication speed into a plurality of sub-data segments for caching, and demodulating the cached sub-service segment data in sequence. Therefore, the embodiment of the application provides a manner similar to time division multiplexing to perform multi-user real-time demodulation, buffer different service demodulation operation segments transmitted by multiple users, and demodulate each segment of buffered data in sequence. The embodiment of the application can meet the requirement of simultaneously demodulating different services of multiple users, fully utilizes on-satellite processing resources, flattens a large amount of data needing parallel processing, and reduces resources needed by multiple users by repeatedly utilizing the same demodulation module.
Based on the content of the foregoing embodiment, in this embodiment, the second processing module is specifically configured to:
and sequentially demodulating the sub-service segment data of each user according to the sequence of the current sub-service segment cache by the user.
The demodulation multiplexing apparatus of the satellite borne receiver according to this embodiment may be used to implement the above method embodiments, and the principle and technical effect are similar, which are not described herein again.
Fig. 5 illustrates a physical structure diagram of an electronic device, which may include, as shown in fig. 5: a processor (processor)510, a communication Interface (Communications Interface)520, a memory (memory)530 and a communication bus 540, wherein the processor 510, the communication Interface 520 and the memory 530 communicate with each other via the communication bus 540. Processor 510 may invoke logic instructions in memory 530 to perform a method of on-board receiver demodulation multiplexing, the method comprising: receiving a spread spectrum signal sent by a user, capturing a pilot frequency band of the spread spectrum signal, and distinguishing the user according to a spread spectrum code in the pilot frequency band; dividing the service segment of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence; after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user; dividing the data segment of the user with the same or similar communication speed into a plurality of sub data segments for caching, and demodulating the cached sub data segments in sequence.
Furthermore, the logic instructions in the memory 530 may be implemented in the form of software functional units and stored in a computer readable storage medium when the software functional units 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, the computer program product including a computer program, the computer program being stored on a non-transitory computer-readable storage medium, wherein when the computer program is executed by a processor, a computer is capable of executing the method for satellite receiver demultiplexing provided by the above methods, the method including: receiving a spread spectrum signal sent by a user, capturing a pilot frequency band of the spread spectrum signal, and distinguishing the user according to a spread spectrum code in the pilot frequency band; dividing the service segment of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence; after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user; dividing the data segment of the user with the same or similar communication speed into a plurality of sub data segments for caching, and demodulating the cached sub data segments in sequence.
In yet another aspect, the present invention also provides a non-transitory computer-readable storage medium having stored thereon a computer program, which when executed by a processor, implements a method for demodulation and multiplexing of a satellite borne receiver provided by the above methods, the method comprising: receiving a spread spectrum signal sent by a user, capturing a pilot frequency band of the spread spectrum signal, and distinguishing the user according to a spread spectrum code in the pilot frequency band; dividing the service segment of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence; after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user; dividing the data segment of the user with the same or similar communication speed into a plurality of sub data segments for caching, and demodulating the cached sub data segments in sequence.
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 (9)
1. A demodulation multiplexing method for a satellite-borne receiver is characterized by comprising the following steps:
receiving a spread spectrum signal sent by a user, capturing a pilot frequency band of the spread spectrum signal, and distinguishing the user according to a spread spectrum code in the pilot frequency band;
dividing the service segment of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence;
after the data demodulation of the service segment of the user is finished, determining the communication rate of the user according to the user transmission service indicated by the service segment of the user;
dividing the data segment of the user with the same or similar communication speed into a plurality of sub data segments for caching, and demodulating the cached sub data segments in sequence.
2. The demodulation multiplexing method for satellite borne receiver according to claim 1, wherein the sequentially demodulating the buffered sub-service segment data comprises:
and sequentially demodulating the sub-service segment data of each user according to the sequence of the current sub-service segment cache by the user.
3. The demodulation multiplexing method for the satellite-borne receiver according to claim 1, wherein the sequentially demodulating the buffered sub-data segments comprises:
and sequentially demodulating the sub-data segment data of each user according to the sequence of the current sub-data segment cache by the user.
4. The on-board receiver demodulation multiplexing method according to claim 1, further comprising:
determining the number of local processing clocks from the first symbol of the current sub-service segment data of each user to the first symbol of the next sub-service segment data of each user according to the transmitting rate of the service segment and the rate of the local processing clock of the field programmable gate array FPGA;
and determining the number of users processed by the satellite borne receiver in the time for demodulating each piece of service segment data according to the number of local processing clocks existing between two symbols and the number of local processing clocks consumed for demodulating the current sub-service segment data of one user.
5. The on-board receiver demodulation multiplexing method according to claim 1, further comprising:
determining the number of local processing clocks from the first symbol of the current sub-data segment data of each user to the first symbol of the next sub-data segment data of each user according to the transmission rate of the service segment and the rate of the local processing clock of the Field Programmable Gate Array (FPGA);
and determining the number of users processed by the satellite-borne receiver in the time for demodulating each piece of data according to the number of local processing clocks existing between two symbols and the number of local processing clocks consumed for demodulating the current sub-data piece data of one user.
6. A satellite-borne receiver demodulation multiplexing apparatus, comprising:
the first processing module is used for receiving a spread spectrum signal sent by a user and capturing a pilot frequency band of the spread spectrum signal so as to distinguish the user according to a spread spectrum code in the pilot frequency band;
the second processing module is used for dividing the service segments of each user into a plurality of sub-service segments for caching, and demodulating the cached sub-service segment data in sequence;
the third processing module is used for determining the communication rate of the user according to the user transmission service indicated by the service segment of the user after the demodulation of the service segment data of the user is finished;
and the fourth processing module is used for dividing the data segment of the user with the same or similar communication speed into a plurality of sub-data segments for caching, and demodulating the cached sub-data segment data in sequence.
7. The on-board receiver demultiplexing device according to claim 6, wherein the second processing module is specifically configured to:
and sequentially demodulating the sub-service segment data of each user according to the sequence of the current sub-service segment cache by the user.
8. 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 performs the steps of the method for on-board receiver demultiplexing according to any of claims 1 to 5.
9. A non-transitory computer-readable storage medium, on which a computer program is stored, wherein the computer program, when being executed by a processor, implements the steps of the method for demodulation multiplexing of a satellite based receiver according to any of claims 1 to 5.
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