CN103368691A - Beidou satellite-based data transmission method and device - Google Patents
Beidou satellite-based data transmission method and device Download PDFInfo
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- CN103368691A CN103368691A CN2013102775749A CN201310277574A CN103368691A CN 103368691 A CN103368691 A CN 103368691A CN 2013102775749 A CN2013102775749 A CN 2013102775749A CN 201310277574 A CN201310277574 A CN 201310277574A CN 103368691 A CN103368691 A CN 103368691A
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Abstract
The invention discloses a Beidou satellite-based data transmission method and a Beidou satellite-based data transmission device. The method comprises the following steps: obtaining data; segmenting the data and packaging the segmented data into one or more than one sub-data packet; transmitting the sub-data packets to a Beidou satellite; receiving the sub-data packets from the Beidou satellite; verifying the sub-data packets, and recombining the sub-data packets to obtain the data; and outputting the data. The transmission of large data is realized by segmenting the data required to be transmitted and packaging the segmented data into a plurality of sub-data packets and transmitting the data through the Beidou satellite.
Description
Technical field
The present invention relates to wireless communication field, particularly relate to the transfer of data based on big-dipper satellite.
Background technology
Bei bucket Wei star Dao boat Xi Tong ﹝ BeiDou Navigation Satellite System ﹞ is the GPS (Global Position System) of China's independent research, independent operating, with the compatible GPS (Global Position System) that shares of the Galileo system of the GPS of the U.S., Muscovite GLONASS, European Union, and claim global four large satellite navigation system.
At present, surpass according to statistics top 50% or more by the covering of the data transmission devices such as GPRS, CDMA, the ocean by area that said transmission signal covered then for less.By the successful operation of first generation Beidou satellite navigation system that BeiDou-I satellite and No. two satellites of the Big Dipper form, it has location and the double action of communicating by letter, and possesses the SMS communication function, is that other navigation system does not possess.
But because the big-dipper satellite transmittability is limited, message volume is little, will run into the transmission difficulty when the user need to transmit more data.
Summary of the invention
Based on this, be necessary to provide a kind of data transmission method based on big-dipper satellite and device, realize the convenient transmission of large data.
A kind of data transmission method based on big-dipper satellite may further comprise the steps: obtain data; To described data sectional, and be packaged into a group or more subdata bag; Send described subdata bag to big-dipper satellite; Receive described subdata bag from big-dipper satellite; The described subdata bag of verification, the described subdata bag and obtain described data of recombinating; Export described data.
Therein among embodiment,, and comprise after being packaged into a group or more the step of subdata bag described data sectional described: described subdata bag is encrypted; Comprise after the described step that receives described subdata bag from big-dipper satellite: the subdata bag to described reception is decrypted.
Therein among embodiment,, and comprise after being packaged into a group or more the step of subdata bag described data sectional described: described subdata bag is compressed; Comprise after the described step that receives described subdata bag from big-dipper satellite: the subdata bag to described reception decompresses.
Among embodiment, the form of described subdata bag comprises: data packet group number, the total quantity of recording sub-data bag therein; Group character, designation data segmentation place; This group sequence number, the sequence number of recording sub-data bag; Effective byte, the content of recording sub-data bag; Parity bit, whether the byte of check subdata bag is correctly complete.
Therein among embodiment, before the described step of obtaining data, comprise: produce data by the prompt operation that triggers.
Based on this, also be necessary to provide a kind of data transmission device based on big-dipper satellite, comprise input module, subpackage module, communication module, correction verification module and the output module of successively electrical connection: input module is used for image data; The subpackage module is used for the data sectional that obtains, and is packaged into a group or more subdata bag; Communication module is used for sending or receiving the subdata bag; Correction verification module is used for the syndrome packet, and the recon packet also obtains data; And output module, be used for the output data.
Among embodiment, also comprise therein: encrypting module is encrypted or the subdata bag that receives is decrypted the subdata bag that sends.
Among embodiment, also comprise therein: compression module, compress or the subdata bag that receives decompressed the subdata bag that sends.
Among embodiment, the form of described subdata bag comprises: data packet group number, the total quantity of recording sub-data bag therein; Group character, designation data segmentation place; This group sequence number, the sequence number of recording sub-data bag; Effective byte, the content of recording sub-data bag; Parity bit, whether the byte of check subdata bag is correctly complete.
Among embodiment, also comprise therein: trigger module is used for producing data by triggering prompt operation.
Above-mentioned data transmission method and device based on big-dipper satellite by the data of needs transmission are carried out segmentation and are packaged into some sub data packets, then by the big-dipper satellite the transmission of data, are realized large data transfer.
Description of drawings
Fig. 1 is the data transmission method flow chart based on big-dipper satellite among the embodiment;
Fig. 2 is the form framework of subdata bag;
Fig. 3 is the flow chart of the check subdata bag among the embodiment among Fig. 1;
Fig. 4 is the flow chart that the packet integrality is carried out verification among the embodiment among Fig. 3;
Fig. 5 is the flow chart that the antithetical phrase packet integrality among the embodiment among Fig. 3 is carried out verification;
Fig. 6 is the flow chart of the recon packet among the embodiment among Fig. 1;
Fig. 7 is the data transmission device structured flowchart based on big-dipper satellite among the embodiment.
Embodiment
The data transmission capabilities of big-dipper satellite is limited, can bring difficulty to communication in the zone that the signal of conventional data transmission device can't cover, especially in electric power, thing by the pipeline line walking, the events such as earthquake relief are badly in need of a large amount of information interactions.
Based on this, by reference to the accompanying drawings 1, the data transmission method based on big-dipper satellite is provided, comprising:
Step S10 obtains data.
Particularly, the data of obtaining can be the text datas that edits, or pass through the data of input equipment (for example keyboard) input.
Step S20 to the data segmentation, and is packaged into a group or more subdata bag.
Because big-dipper satellite limits the size of data, larger data can't once be sent, and then are divided into first one or more groups data segment, and every section is packaged into one group of subdata bag.
In other embodiments, by reference to the accompanying drawings 2, the form of subdata bag comprises:
The data packet group number, the total quantity of recording sub-data bag.
Group character, designation data segmentation place.
This group sequence number, the sequence number of recording sub-data bag.
Effective byte, the content of recording sub-data bag.
Parity bit, whether the byte of check subdata bag is correctly complete.
Wherein, subdata bag limited length is 78 bytes, and wherein data packet group number, group character, this group sequence number account for 10 bytes altogether, and effective byte accounts for the 60-67 byte, and the odd-even check district accounts for 1 byte.
Step S30 sends the subdata bag to big-dipper satellite.
Particularly, big-dipper satellite is sent to big-dipper satellite to packaged subdata bag as " medium " of transfer of data.
Step S40 receives the subdata bag from big-dipper satellite.
Particularly, big-dipper satellite externally sends receiving the subdata bag as " medium " of transfer of data, and corresponding just receives the subdata bag from big-dipper satellite.
Step S50, the syndrome packet, the recon packet also obtains data.
Particularly, the subdata bag that receives is carried out verification, guarantee integrality and the fail safe of the subdata bag received.Then, received subdata bag is recombinated, finally obtain data.
Step S60, the output data.
Particularly, the data that the output restructuring obtains, the data of output can or be transferred to the equipment of appointment and carry out follow-up processing by the display screen displaying.
By the data of needs transmission are carried out segmentation and are packaged into some sub data packets, then by the big-dipper satellite the transmission of data, realize large data transfer.
In one embodiment, by reference to the accompanying drawings 3～5, the syndrome packet among the step S50 comprises:
Step S51A: the packet integrality is carried out verification.
It is some sub data packets by subpackage that a larger packet is arranged, and the integrality of receive data bag is that the assurance data are accurately transmitted, and is concrete:
Step S511A: unwrap the beginning receiving first subdata, budget receives the required duration of all subdata bags automatically.For example, at the subdata bag that receives first and transmit, the time that receives according to the next subdata of the big or small budget of this packet.The concrete estimated time can be passed through predetermined threshold value, and when the size of packet surpasses default threshold value, then the estimated time is a second; If the threshold value that light rain is default, then the estimated time is b second.
Step S512A: judge whether to surpass duration, if then enter step S513A, then enter if not step S52A.
Step S513A: the data packet group number and this group sequence number that read all subdata bags that received.
Step S514A: judge whether the total quantity of the subdata bag that the data packet group number records and the subdata bag sequence number that this group sequence number records be complete, if then enter step S52A, then enters if not step S515A.
Step S515A: find out the sequence number of omitting the subdata bag, and the transmitted signal request sends the subdata bag of omitting group.
Step S52A: antithetical phrase packet integrality is carried out verification.
Carry out verification for a complete packet, also need simultaneously each sub data packets is carried out verification, concrete:
Step S521A: read the information of the odd even detecting position of subdata bag, whether correct by parity check method and judged result, be then to enter step S522A, otherwise enter step S523A.
Step S522A: jump to next sub data packets, continue the syndrome packet until verification is complete.
Step S523A: the misregistration frame information, and after all frames of current subdata bag received, the transmitted signal request sent the data of particular frame again, replaced erroneous frame after receiving particular frame, and re-execute the odd even detection method.Only need to the data of particular frame be resend, but not resend in data whole, reduced volume of transmitted data, also promoted to a certain extent data transfer speed.
By packet and subdata bag are carried out verification, further guaranteed the integrality of data, the possibility that reduces loss of data or make mistakes.
In one embodiment, by reference to the accompanying drawings 6, the recon packet among the step S50 comprises:
Step S51B: all subdata bags are arranged in order according to the group character of each subdata bag, the information of this group sequence number record.
Step S52B: the content of the effective byte in each subdata bag is recombinated according to the order that arranges, be reduced into received packet.
In one embodiment, the data transmission method based on big-dipper satellite also comprises:
After step S20, have: the subdata bag that sends is encrypted.
After step S40, have: the subdata bag that receives is decrypted.
In the process that the antithetical phrase packet is encrypted or deciphers, the encryption of adopting or the method for deciphering are encryption or decryption method commonly used, for example Caesar (Caesar), DES algorithm, RSA Algorithm, MD5 algorithm or PGP cryptographic algorithm.
In one embodiment, the data transmission method based on big-dipper satellite also comprises:
After step S20, have: the subdata bag that sends is compressed.
After step S40, have: the subdata bag that receives is decompressed.
The compression of antithetical phrase packet is method commonly used with the method adopt that decompresses, such as Huffman (Huffman) or LZW(Lempel-Ziv-Welch) etc.
In one embodiment, the data transmission method based on big-dipper satellite also comprised before step S10:
Produce data by the prompt operation that triggers.Specific, by default emergent quick operating mode, key needs rescue when emergency occurs, and then produces the data that comprise rescue information, and such as information such as SOS, and this data length be able to once be transmitted by big-dipper satellite.Therefore, the emergence message that produces can transmit by big-dipper satellite fast, and is convenient and swift.
Based on above-mentioned data transmission method based on big-dipper satellite, also be necessary to provide the data transmission device based on big-dipper satellite, by reference to the accompanying drawings 7, comprising:
Particularly, the subpackage module comprises processing unit and buffer unit, the subdata of buffer unit storage subpackage, and processing unit is divided into some sub data packets to packet.
In other embodiments, the form of subdata bag comprises: data packet group number, the total quantity of recording sub-data bag; Group character, designation data segmentation place; This group sequence number, the sequence number of recording sub-data bag; Effective byte, the content of recording sub-data bag; Parity bit, whether the byte of check subdata bag is correctly complete.
In one embodiment, correction verification module 40 comprises:
Authentication unit is used for the packet integrality is carried out verification.
Subdata bag authentication unit is used for antithetical phrase packet integrality and carries out verification.
Recomposition unit is used for the antithetical phrase packet and recombinates.
Further, authentication unit comprises:
Budget duration subelement is used for unwrapping the beginning receiving first subdata, and budget receives the required duration of all subdata bags automatically.
Duration judgment sub-unit: judge whether to surpass duration, if then process by reading subelement, then processed by recomposition unit if not.
Read subelement: the data packet group number and this group sequence number that are used for reading all subdata bags that received.
Recorded information integrality judgment sub-unit: judge whether the total quantity of the subdata bag that the data packet group number records and the subdata bag sequence number that this group sequence number records be complete, if then processed by recomposition unit, then process by omitting subdata bag supplementary units if not.
Omit the subdata bag and reissue the unit, find out the sequence number of omitting the subdata bag, and the transmitted signal request sends the subdata bag of omitting group.
Further, the checking of subdata bag comprises:
Detect judging unit, whether correct by parity check method and judged result for the information of the odd even detecting position that reads the subdata bag, be then to be processed by the circulation subelement, otherwise process by replacing subelement.
Circulation subelement: be used for jumping to next sub data packets, continue the antithetical phrase packet and carry out verification.
Replace subelement: be used for the misregistration frame information, and after all frames of current subdata bag received, the transmitted signal request sent the data of particular frame again, replaced erroneous frame after receiving particular frame, and re-execute the odd even detection method.
Further, recomposition unit comprises:
Arrange subelement: for according to the group character of each subdata bag, the information of this group sequence number record all subdata bags being arranged in order
Atomic unit also: be used for the content of the effective byte of each subdata bag is recombinated according to the order that arranges, be reduced into received packet.
In one embodiment, the data transmission device based on big-dipper satellite also comprises: encrypting module is encrypted or the subdata bag that receives is decrypted the subdata bag that sends.The method that adopts, for example Caesar (Caesar), DES algorithm, RSA Algorithm, MD5 algorithm or PGP cryptographic algorithm.
In one embodiment, also comprise based on the data transmission device of big-dipper satellite: compression module, compress or the subdata bag that receives decompressed the subdata bag that sends.The method that adopts, such as Huffman (Huffman) or LZW(Lempel-Ziv-Welch) etc.
In one embodiment, the data transmission device based on big-dipper satellite also comprises: trigger module is used for producing data by triggering prompt operation.Need rescue when emergency occurs, then produce the data that comprise rescue information, such as information such as SOS, and this data length be able to once be transmitted by big-dipper satellite.The emergence message that produces can transmit by big-dipper satellite fast, and is convenient and swift.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. data transmission method based on big-dipper satellite may further comprise the steps:
Obtain data;
To described data sectional, and be packaged into a group or more subdata bag;
Send described subdata bag to big-dipper satellite;
Receive described subdata bag from big-dipper satellite;
The described subdata bag of verification, the described subdata bag and obtain described data of recombinating;
Export described data.
2. the data transmission method based on big-dipper satellite according to claim 1 is characterized in that,, and comprises after being packaged into a group or more the step of subdata bag described data sectional described:
Described subdata bag is encrypted;
After the described step that receives described subdata bag from big-dipper satellite, comprise:
Subdata bag to described reception is decrypted.
3. the data transmission method based on big-dipper satellite according to claim 1 and 2 is characterized in that,, and comprises after being packaged into a group or more the step of subdata bag described data sectional described:
Described subdata bag is compressed;
After the described step that receives described subdata bag from big-dipper satellite, comprise:
Subdata bag to described reception decompresses.
4. the data transmission method based on big-dipper satellite according to claim 3 is characterized in that, the form of described subdata bag comprises:
The data packet group number, the total quantity of recording sub-data bag;
Group character, designation data segmentation place;
This group sequence number, the sequence number of recording sub-data bag;
Effective byte, the content of recording sub-data bag;
Parity bit, whether the byte of check subdata bag is correctly complete.
5. the data transmission method based on big-dipper satellite according to claim 1 is characterized in that, comprises before the described step of obtaining data:
Produce data by the prompt operation that triggers.
6. the data transmission device based on big-dipper satellite is characterized in that, comprises input module, subpackage module, communication module, correction verification module and the output module of successively electrical connection:
Input module is used for image data;
The subpackage module is used for the data sectional that obtains, and is packaged into a group or more subdata bag;
Communication module is used for sending or receiving the subdata bag;
Correction verification module is used for the syndrome packet, and the recon packet also obtains data; And
Output module is used for the output data.
7. the data transmission device based on big-dipper satellite according to claim 6 is characterized in that, also comprises:
Encrypting module is encrypted or the subdata bag that receives is decrypted the subdata bag that sends.
8. according to claim 6 or 7 described data transmission devices based on big-dipper satellite, it is characterized in that, also comprise:
Compression module compresses or the subdata bag that receives is decompressed the subdata bag that sends.
9. the data transmission device based on big-dipper satellite according to claim 8 is characterized in that, the form of described subdata bag comprises:
The data packet group number, the total quantity of recording sub-data bag;
Group character, designation data segmentation place;
This group sequence number, the sequence number of recording sub-data bag;
Effective byte, the content of recording sub-data bag;
Parity bit, whether the byte of check subdata bag is correctly complete.
10. the data transmission device based on big-dipper satellite according to claim 6 is characterized in that, also comprises:
Trigger module is used for producing data by triggering prompt operation.
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