CN104202182A - Satellite system reconstruction method on orbit based on information hiding - Google Patents
Satellite system reconstruction method on orbit based on information hiding Download PDFInfo
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Abstract
Disclosed is a satellite system reconstruction method on an orbit based on information hiding. The satellite system reconstruction method on the orbit based on the information hiding is used to generate a configuration file according to user demands and download the configuration file onto an FFGA (field programmable gate array) of a processing unit on a satellite, and includes steps: 1) generating the configuration file according to the user demands; 2) performing transmission operation on reconstitution data, wherein a ground management center hides configuration file data in a data frame sent by a data link, and sends the configuration file data to a control unit on the satellite, and the control unit on the satellite completes data verification, extraction and storage; 3) performing reconstruction operation, wherein the configuration file stored in the control unit on the satellite is downloaded in the FPGA of the processing unit on the satellite according to reconstruction instruction start operation sent by the ground management center. The satellite system reconstruction method on the orbit based on the information hiding solves the problems that an existing satellite system can not be flexibly used for meeting new functional demands of a user, a remote metering channel is used in the reconstruction operation, and therefore the defects of being low in data transmission speed and poor in instantaneity are caused in the prior art by hiding the configuration file data in the data frame sent by a data link channel.
Description
Technical field
The present invention relates to technical field of satellite communication, particularly the reconstructing method in-orbit of the satellite system based on Information hiding.
Background technology
At the beginning of the Functional Design of existing satellite treatment system, determine, the realization of its function relies on the configuration file in the FPGA pseudostatic ram in On-Star system to complete, and this configuration file has been realized the function of satellite system.Configuration file has cured in memory before satellite launch, and therefore, in the time that user has new functional requirement, this satellite can not be realized new function by the program that changes self, cannot meet the demands.Simultaneously existing reconstructing method adopts satellite remote control telemetering channel to carry out transfer of data, and transmission rate is low and real-time is poor, can not meet the transmission requirement of configuration file.
In sum, existing satellite system can not flexible Application in the new functional requirement of user, therefore, the present invention proposes a kind of satellite system based on Information hiding reconstructing method in-orbit, the method is in the time that user has new functional requirement, by Information Hiding Algorithms, configuration file is hidden in and in data link, sends to the control unit in satellite system, control unit extracts in configuration file write memory, floor control center sends remote control command to control unit, new configuration file is re-loaded in the FPGA of processing unit on star, realize the change of satellite system function, thereby realize the reconstruct in-orbit of On-Star system.
(1) By consulting literatures, in database, search " Information hiding ", " satellite system " and " reconstruct ", does not find relevant scientific paper.
(2) consult the documents such as external report, search " Information Hiding ", " Satellite System ", " Reconfigure ", do not find related article.
(3) consult patent database, search " Information hiding ", " satellite system " and " reconstruct ", do not find Patents.
(4) search " Information Hiding ", " Satellite System ", " Reconfigure " in patent database, do not find Patents.
According to existing disclosed data check, satellite system can not be carried out adaptation flexibly because of user's demand at present, and it is low poor with real-time to adopt telemetering channel to be reconstructed operating data transmission rate; Still there is no at present the satellite system reconstructing method in-orbit based on Information hiding.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, satellite system based on Information hiding reconstructing method is in-orbit provided, in the Frame that the method sends at data link channel, hide profile data,, solve existing satellite system can not flexible Application in the new functional requirement of user with utilize telemetering channel to be reconstructed operation and cause the low and poor problem of real-time of message transmission rate.
Above-mentioned purpose of the present invention is achieved by following technical proposals:
Satellite system based on Information hiding reconstructing method in-orbit, comprises that step is as follows:
Step (one), floor control center generate binary configuration file according to user function demand;
Step (two), on floor control center and star, between control unit, be reconstructed transfer of data, detailed process is as follows:
(1), open reconstruct data transmission operation: floor control center sends transmission control command to control unit on star by remote measuring and controlling passage; On star, control unit receives after transmission control command, the section sequence number L of reading out data memory from described control command, and send a confirmation message to floor control center by remote measuring and controlling passage;
(2), floor control center receives after the confirmation that on star, control unit sends, utilize lossless information concealing method that the binary data in the configuration file generating in step () is hidden in the Frame that data link channel will send, and in the enterprising row labels in the reserved bit position of described Frame frame head, if hidden profile data in Frame, the reserved bit position padding data " 1 " of described Frame frame head; Again the load data of described Frame is carried out to CRC check, and the result of verification is placed in the respective byte of described Frame frame head;
(3) Frame that, floor control center obtains step (2) sends to control unit on star by data link channel;
(4), control unit receives after Frame on star, and the data on the reserved bit position of described Frame frame head are identified, if described data are " 1 ", judges that described Frame is as the Frame of having hidden configuration file; Load data to the Frame of having hidden configuration file carries out CRC check, and the CRC check result of preserving in described check results and Frame frame head byte is compared;
If described CRC check result is different from the CRC check result of preserving in Frame frame head byte, on star, control unit passes through the administrative center's transmission false command earthward of remote measuring and controlling passage, request resends the Frame of hiding configuration file, floor control center receives after described false command, returns to step (3) and resends Frame;
If the CRC check of preserving in described CRC check result and Frame frame head byte comes to the same thing, from Frame, extract profile data by the hiding data extraction module in control unit on star; And described profile data is written in L section of data storage;
(5), repeating step (3)～(4), all configuration file data are written in the data storage section of control unit on star, after wherein floor control center is sent completely all Frames of having hidden configuration file, send configuration END instruction to control unit on star by remote measuring and controlling passage; On star, control unit receives configuration END instruction and completes after configuration file stores, is sent and is successfully received response signal to floor control center, the reconstruct data end of transmission by remote measuring and controlling passage;
Step (three), on floor control center, star, on control unit and star, between processing unit, be reconstructed operation, detailed process is as follows:
(6), open restructuring procedure operation: floor control center by remote measuring and controlling passage transmitting system reconstruct control command to control unit on star, on star, control unit receives after system reconfiguration control command, sends confirmation to floor control center by remote measuring and controlling passage;
(7), receive after the acknowledge message that on star, control unit sends at floor control center, send restructuring directive to control unit on star by remote measuring and controlling passage, on star, control unit receives after described restructuring directive, extract the sequence number K that will configure FPGA in restructuring directive, from star, in control unit, in K section of data storage, read configuration file, and described configuration file is downloaded on star in K FPGA in processing unit;
(8) if described configuration file failed download, on star processing unit by failed download state information report to control unit on star, on star, control unit sends failed download confirmation to floor control center by remote measuring and controlling passage, restructuring directive is retransmitted at request floor control center, returns to step (7);
If configuration file is downloaded successfully, on star, processing unit will be downloaded success status information reporting to control unit on star, and on star, control unit is sent and downloaded successful confirmation to floor control center by remote measuring and controlling passage, finish restructuring procedure operation;
Wherein L, K are positive integer.
In the above-mentioned satellite system based on Information hiding in-orbit in reconstructing method, in (2) step of step (two), floor control center utilizes lossless information concealing method that the binary data in the configuration file generating in step () is hidden in the Frame that data link channel will send, and concrete methods of realizing is as follows:
(a) binary data in the Frame that, data link channel will be sent is transformed to decimal data by byte, search the decimal data X that in described Frame, occurrence number is maximum, then according to from 1 to 255 order, in Frame, searching and whether having numerical value is 1～255 data, if find not exist in Frame data Y in search procedure, wherein Y ∈ 1～255, searches described in stopping; If numerical value 1～255 all occurred in Frame, described Frame can not be used for hiding profile data, selects next frame data to process, and returns to the original position of this step and processes;
(b) Frame, obtaining in step (a) finds the byte that occurs for the first time data X, and read the binary data of configuration file, if data are " 1 " in configuration file, described byte is revised as to data Y, is hidden in described byte by the data in configuration file " 1 "; If data are " 0 " in configuration file, keep the data X of described byte constant, be hidden in described byte by the data in configuration file " 0 ";
Then in described Frame, search the byte that data X appears in the next one, and read next binary data in configuration file, if data are " 1 " in configuration file, described byte is revised as to data Y, be hidden in described byte by the data in configuration file " 1 ", if data are " 0 " in configuration file, keeping described byte is that data X is constant, is hidden in described byte by the data in configuration file " 0 ";
The like, in Frame, occur and in the byte of data X, hide the binary data in configuration file, and data X and data Y are write in the frame header byte of described Frame; Again the decimal data of Frame is converted to binary data;
(c), repeating step (a)～(b), until all binary data of configuration file are hidden in the each Frame in data link channel.
In the above-mentioned satellite system based on Information hiding in-orbit in reconstructing method, in (4) step of step (two), on star, control unit extracts profile data by hiding data extraction module from Frame, and its concrete methods of realizing is as follows:
(a), each byte in Frame is transformed to decimal data;
(b), the data X and the data Y that preserve in read data frame frame head, and search data X and data Y in load data in Frame, if read data X, extract data " 0 " as profile data; If read data Y, to extract data " 1 " as profile data, and the data Y in Frame is reduced to data X, the Frame data that have been about to hide profile data are reduced to former Frame data.
The present invention compared with prior art has following beneficial effect:
(1), method of the present invention, according to user's request generating configuration file and be deposited in the FPGA of processing unit on star, the function that can guarantee satellite system can dynamically update according to user's request, the advance that keeps satellite processing and exchanging system, meets the functional requirement of user to different disposal switching system;
(2), method of the present invention, configuration file is hidden in the Frame in existing data link channel, communicate with processing and exchanging system on star, do not increase system bandwidth and excessive data passage, do not interrupt original user's transfer of data, real-time is good, and has reduced the consumption of resource, compared with the method that is reconstructed operation with employing telemetering channel, can effectively improve message transmission rate and real-time.
Brief description of the drawings
Fig. 1 is the satellite system composition frame chart of reconfiguration system in-orbit;
Fig. 2 is reconstruct data transmission operating process flow chart in the present invention;
Fig. 3 is restructuring procedure flow chart in the present invention;
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Satellite system based on Information hiding of the present invention in-orbit reconstructing method be based on satellite system in-orbit reconfiguration system complete, be illustrated in figure 1 the satellite system composition frame chart of reconfiguration system in-orbit, as seen from the figure, satellite system in-orbit reconfiguration system is made up of processing unit on control unit, star on floor control center, star, wherein, on star, control unit is made up of processor on star and memory.
Wherein, floor control center is the control centre of satellite system, completes the transmission of control command, the data of configuration file hide and send and with star on the function such as Signalling exchange of control unit.
On star, control unit is the executor of ground control command, completes and the Signalling exchange at floor control center the extraction of configuration file and storage, the functions such as the reconstruct loading of configuration file.On star, control unit is made up of processor on star and memory, and on its culminant star, processor completes and Signalling exchange, data check, the extraction of configuration file and the control to memory of terrestrial contr, and memory completes the classification storage of configuration file.
On star, processing unit completes configuration file load operation, and reports download state to control unit on star.
Satellite system based on Information hiding reconstructing method in-orbit, comprises that step is as follows:
Step (one), floor control center generate binary configuration file according to user function demand;
Step (two), on floor control center and star, between control unit, be reconstructed transfer of data, the flow chart of reconstruct data transmission as shown in Figure 2, detailed process is as follows:
(1), open reconstruct data transmission operation: floor control center sends transmission control command to control unit on star by remote measuring and controlling passage; On star, control unit receives after transmission control command, the section sequence number L of reading out data memory from described control command, and send a confirmation message to floor control center by remote measuring and controlling passage;
Wherein, total N the section of the data storage of control unit on star, which configuration file being sent on star before control unit, need in control command, should be kept in data storage section by clear and definite configuration file, i.e. the section sequence number L of data writing memory in control command;
(2), floor control center receives after the confirmation that on star, control unit sends, utilize lossless information concealing method that the binary data in the configuration file generating in step () is hidden in the Frame that data link channel will send, specific implementation step is as follows:
(a) binary data in the Frame that, data link channel will be sent is transformed to decimal data by byte, search the decimal data X that in described Frame, occurrence number is maximum, then according to from 1 to 255 order, in Frame, searching and whether having numerical value is 1～255 data, if find not exist in Frame data Y in search procedure, wherein Y ∈ 1～255, searches described in stopping; If numerical value 1～255 all occurred in Frame, described Frame can not be used for hiding profile data, selects next frame data to process, and returns to the original position of this step and processes.
For example, if the data that in Frame, occurrence number is maximum are 17, X=17, then search and in Frame, whether occur numeral " 1 ", if numeral " 1 " occurred at Frame search in Frame whether occur numeral " 2 ", if numeral " 2 " occurred at Frame again, search again and in Frame, whether occur numeral " 3 ", the like, if when numeral " 127 " is searched, find that numeral " 127 " did not occur in Frame, Y=127, stops searching.
(b) Frame, obtaining in step (a) finds the byte that occurs for the first time data X, and read the binary data of configuration file, if data are " 1 " in configuration file, described byte is revised as to data Y, is hidden in described byte by the data in configuration file " 1 "; If data are " 0 " in configuration file, keep the data X of described byte constant, be hidden in described byte by the data in configuration file " 0 ";
Then in described Frame, search the byte that data X appears in the next one, and read next binary data in configuration file, if data are " 1 " in configuration file, described byte is revised as to data Y, be hidden in described byte by the data in configuration file " 1 ", if data are " 0 " in configuration file, keeping described byte is that data X is constant, is hidden in described byte by the data in configuration file " 0 ";
The like, in Frame, occur in the byte of data X and hide the binary data in configuration file, for the ease of the extraction of follow-up hidden file, and data X and data Y are write in the frame header byte of described Frame; Again the decimal data of Frame is converted to binary data;
(c), repeating step (a)～(b), until all binary data of configuration file are hidden in the each Frame in data link channel.
And in the enterprising row labels in the reserved bit position of described Frame frame head, if hidden profile data in Frame, the reserved bit position padding data " 1 " of described Frame frame head; The load data of described Frame is carried out to CRC check, and the result of described verification is placed in the respective byte in described Frame frame head.
(3) Frame that floor control center obtains step (2) sends to control unit on star by data link channel;
(4) on star, control unit receives after Frame, and the data on the reserved bit position of described Frame frame head are identified, if described data are " 1 ", judges that described Frame is as the Frame of having hidden configuration file; Load data to the Frame of having hidden configuration file carries out CRC check, and the CRC check result of preserving in described check results and Frame frame head byte is compared;
If described CRC check result is different from the CRC check result of preserving in Frame frame head byte, on star, control unit passes through the administrative center's transmission false command earthward of remote measuring and controlling passage, request resends the Frame of hiding configuration file, floor control center receives after described false command, returns to step (3);
If the CRC check of preserving in described CRC check result and Frame frame head byte comes to the same thing, from Frame, extract profile data by the hiding data extraction module in control unit on star; And described profile data is written in L section of data storage, after completing all profile datas and writing, send and successfully receive response signal to floor control center by remote measuring and controlling passage by control unit on star; Wherein L is the section sequence number L of the data storage that reads from control command of step (2);
Wherein, from Frame, extract the specific implementation process of profile data by the hiding data extraction module in control unit on star as follows:
(a), each byte in Frame is transformed to decimal data;
(b), the data X and the data Y that preserve in read data frame frame head, and search data X and data Y in load data in Frame, if read data X, extract data " 0 " as profile data; If read data Y, to extract data " 1 " as profile data, and the data Y in Frame is reduced to data X, the Frame data that have been about to hide profile data are reduced to former Frame data.
(5), repeating step (3)～(4), all configuration file data are written in the data storage section of control unit on star, after wherein floor control center is sent completely all Frames of having hidden configuration file, send configuration END instruction to control unit on star by remote measuring and controlling passage; On star, control unit receives configuration END instruction and completes after configuration file stores, is sent and is successfully received response signal to floor control center, the reconstruct data end of transmission by remote measuring and controlling passage;
Step (three), on floor control center, star, on control unit and star, between processing unit, be reconstructed operation, restructuring procedure operational flowchart as shown in Figure 3, detailed process is as follows:
(6), open restructuring procedure operation: floor control center by remote measuring and controlling passage transmitting system reconstruct control command to control unit on star, on star, control unit receives after system reconfiguration control command, sends confirmation to floor control center by remote measuring and controlling passage;
(7), receive after the acknowledge message that on star, control unit sends at floor control center, send restructuring directive to control unit on star by remote measuring and controlling passage, on star, control unit receives after described restructuring directive, extract the sequence number K that will configure FPGA in restructuring directive, from star, in control unit, in K section of data storage, read configuration file, and described configuration file is downloaded on star in K FPGA in processing unit;
Total N the section of the data storage of control unit on its culminant star, on star, processing unit has N FPGA, the N of a data storage section is corresponding one by one with N FPGA, therefore in reconstructed operation, according to the FPGA sequence number reading in restructuring directive, read the configuration file in respective memory section and download in corresponding FPGA;
(8) if described configuration file failed download, on star processing unit by failed download state information report to control unit on star, on star, control unit sends failed download confirmation to floor control center by remote measuring and controlling passage, restructuring directive is retransmitted at request floor control center, returns to step (7);
If configuration file is downloaded successfully, on star, processing unit will be downloaded success status information reporting to control unit on star, and on star, control unit is sent and downloaded successful confirmation to floor control center by remote measuring and controlling passage, finish restructuring procedure operation;
Wherein L, K are positive integer.
The above; be only the embodiment of the best of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
The content not being described in detail in specification of the present invention belongs to professional and technical personnel in the field's known technology.
Claims (3)
1. the reconstructing method in-orbit of the satellite system based on Information hiding, is characterized in that comprising that step is as follows:
Step (one), floor control center generate binary configuration file according to user function demand;
Step (two), on floor control center and star, between control unit, be reconstructed transfer of data, detailed process is as follows:
(1), open reconstruct data transmission operation: floor control center sends transmission control command to control unit on star; On star, control unit receives after transmission control command, the section sequence number L of reading out data memory from described control command, and send a confirmation message to floor control center;
(2), floor control center receives after the confirmation that on star, control unit sends, utilize lossless information concealing method that the binary data in the configuration file generating in step () is hidden in the Frame that data link channel will send, and in the enterprising row labels in the reserved bit position of described Frame frame head, if hidden profile data in Frame, the reserved bit position padding data " 1 " of described Frame frame head; Again the load data of described Frame is carried out to CRC check, and the result of verification is placed in the respective byte of described Frame frame head;
(3) Frame that, floor control center obtains step (2) sends to control unit on star by data link channel;
(4), control unit receives after Frame on star, and the data on the reserved bit position of described Frame frame head are identified, if described data are " 1 ", judges that described Frame is as the Frame of having hidden configuration file; Load data to the Frame of having hidden configuration file carries out CRC check, and the CRC check result of preserving in described check results and Frame frame head byte is compared;
If described CRC check result is different from the CRC check result of preserving in Frame frame head byte, control unit administrative center's transmission false command earthward on star, request resends the Frame of hiding configuration file, floor control center receives after described false command, returns to step (3) and resends Frame;
If the CRC check of preserving in described CRC check result and Frame frame head byte comes to the same thing, from Frame, extract profile data by the hiding data extraction module in control unit on star; And described profile data is written in L section of data storage;
(5), repeating step (3)～(4), all configuration file data are written in the data storage section of control unit on star, after wherein floor control center is sent completely all Frames of having hidden configuration file, send configuration END instruction to control unit on star; On star, control unit receives configuration END instruction and completes after configuration file stores, sends and successfully receives response signal to floor control center, the reconstruct data end of transmission;
Step (three), on floor control center, star, on control unit and star, between processing unit, be reconstructed operation, detailed process is as follows:
(6), open restructuring procedure operation: floor control master reference system reconstruct control command is to control unit on star, and on star, control unit receives after system reconfiguration control command, sends confirmation to floor control center;
(7), receive after the acknowledge message that on star, control unit sends at floor control center, send restructuring directive to control unit on star, on star, control unit receives after described restructuring directive, extract the sequence number K that will configure FPGA in restructuring directive, from star, in control unit, in K section of data storage, read configuration file, and described configuration file is downloaded on star in K FPGA in processing unit;
(8) if described configuration file failed download, on star processing unit by failed download state information report to control unit on star, on star, control unit sends failed download confirmation to floor control center, restructuring directive is retransmitted at request floor control center, returns to step (7);
If configuration file is downloaded successfully, on star, processing unit will be downloaded success status information reporting to control unit on star, and on star, control unit sends and downloads successful confirmation to floor control center, finishes restructuring procedure operation;
Wherein L, K are positive integer.
2. the satellite system based on Information hiding according to claim 1 reconstructing method in-orbit, it is characterized in that: in (2) step of step (two), floor control center utilizes lossless information concealing method that the binary data in the configuration file generating in step () is hidden in the Frame that data link channel will send, and concrete methods of realizing is as follows:
(1) binary data in the Frame that, data link channel will be sent is transformed to decimal data by byte, search the decimal data X that in described Frame, occurrence number is maximum, then according to from 1 to 255 order, in Frame, searching and whether having numerical value is 1～255 data, if find not exist in Frame data Y in search procedure, wherein Y ∈ 1～255, searches described in stopping; If numerical value 1～255 all occurred in Frame, described Frame can not be used for hiding profile data, selects next frame data to process, and returns to the original position of this step and processes;
(2) Frame, obtaining in step (1) finds the byte that occurs for the first time data X, and read the binary data of configuration file, if data are " 1 " in configuration file, described byte is revised as to data Y, is hidden in described byte by the data in configuration file " 1 "; If data are " 0 " in configuration file, keep the data X of described byte constant, be hidden in described byte by the data in configuration file " 0 ";
Then in described Frame, search the byte that data X appears in the next one, and read next binary data in configuration file, if data are " 1 " in configuration file, described byte is revised as to data Y, be hidden in described byte by the data in configuration file " 1 ", if data are " 0 " in configuration file, keeping described byte is that data X is constant, is hidden in described byte by the data in configuration file " 0 ";
The like, in Frame, occur and in the byte of data X, hide the binary data in configuration file, and data X and data Y are write in the frame header byte of described Frame; Again the decimal data of Frame is converted to binary data;
(3), repeating step (1)～(2), until all binary data of configuration file are hidden in the each Frame in data link channel.
3. the satellite system based on Information hiding according to claim 1 reconstructing method in-orbit, it is characterized in that: in (4) step of step (two), on star, control unit extracts profile data by hiding data extraction module from Frame, and its concrete methods of realizing is as follows:
(1), each byte in Frame is transformed to decimal data;
(2), the data X and the data Y that preserve in read data frame frame head, and search data X and data Y in load data in Frame, if read data X, extract data " 0 " as profile data; If read data Y, to extract data " 1 " as profile data, and the data Y in Frame is reduced to data X, the Frame data that have been about to hide profile data are reduced to former Frame data.
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| CN112491457A (en) * | 2020-10-16 | 2021-03-12 | 浙江吉利控股集团有限公司 | Satellite on-orbit reconstruction method, device, system, equipment and storage medium |
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