CN104698479B - The coding/decoding method of navigation message and decoding apparatus - Google Patents
The coding/decoding method of navigation message and decoding apparatus Download PDFInfo
- Publication number
- CN104698479B CN104698479B CN201510083604.1A CN201510083604A CN104698479B CN 104698479 B CN104698479 B CN 104698479B CN 201510083604 A CN201510083604 A CN 201510083604A CN 104698479 B CN104698479 B CN 104698479B
- Authority
- CN
- China
- Prior art keywords
- navigation message
- subframe
- navigation
- original
- frame
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
Abstract
This application discloses a kind of coding/decoding method of navigation message and decoding apparatus.This coding/decoding method includes：Frame synchronization is carried out to received navigation message, the step of this frame synchronization further includes whether the coded system judging navigation message is continuous convolution coding, when the coded system of navigation message is continuous convolution coded system, determine the pseudo- frame head of the subframe of navigation message, and according to determined by pseudo- frame head carry out frame synchronization, when the coded system of navigation message is not continuous convolution coded system, the original fixing frame head of the subframe according to navigation message carries out frame synchronization；And the navigation message after frame synchronization is entered with row decoding, obtain original navigation textual information and check information.
Description
Technical field
The application is related to coding/decoding method and the decoding apparatus of navigation message.
Background technology
Development with GPS (GNSS) and perfect, introduces pilot channel data in navigation signal
Passage, navigation neceiver can determine current text bit position using the quadratic code in pilot tone, realizes bit synchronous, then
Realize frame synchronization using the preamble sequence in the navigation message carrying on data branch road, subsequently carry out decoded operation.
Existing navigation signal generally adopts block code coded system and general convolution coding mode.Compile through block code
Code mode and general convolution coding mode encode after navigation signal there is fixing frame head structure, can be received by comparison
Navigation message bit sequence and fixing preamble sequence, realize frame synchronization.
Continuous convolution coded system is the new Signal coding mode that partly will adopt in navigation signal of future generation.Due to
In continuous convolution coded system, the data of rear several bits of previous frame by the convolutional encoding process participating in next frame, therefore
The data that the data burst encoding through continuous convolution does not have between fixing frame head, and each frame is independent.So make to pass
System navigation signal receiver cannot be used directly for receiving the navigation signal through continuous convolution coding.
Content of the invention
The purpose of the application is coding/decoding method and the decoding apparatus providing navigation message, can receive through continuous convolution coding
The navigation signal that mode encodes.
According to the one side of the application, disclose a kind of coding/decoding method of navigation message, described coding/decoding method includes：Right
Received navigation message carries out frame synchronization, and the step of described frame synchronization further includes to judge the coding staff of described navigation message
Whether formula is continuous convolution coding, when the coded system of described navigation message is continuous convolution coded system, leads described in determination
Avionics literary composition subframe pseudo- frame head, and according to determined by puppet frame head carry out frame synchronization, when the coded system of described navigation message
When not being continuous convolution coded system, the original fixing frame head of the subframe according to described navigation message carries out frame synchronization；And it is right
Navigation message after frame synchronization enters row decoding, obtains original navigation textual information and check information.
According to further aspect of the application, disclose a kind of decoding apparatus of navigation message, described device includes：Frame is same
Step module, described frame synchronization module judges whether the coded system of received navigation message is continuous convolution coding, works as institute
When to state the coded system of navigation message be continuous convolution coded system, determine the pseudo- frame head of the subframe of described navigation message, and root
According to determined by pseudo- frame head carry out frame synchronization, when the coded system of described navigation message is not continuous convolution coded system, root
Original fixing frame head according to the subframe of described navigation message carries out frame synchronization；And decoding module, described decoding module is to frame together
Navigation message after step enters row decoding, obtains original navigation textual information and check information.
Brief description
Fig. 1 shows the original navigation text subframe structure of the L5 signal of GPS；
Fig. 2 shows the structure of continuous convolution encoder；
The flow chart that Fig. 3 shows a kind of coding/decoding method of the navigation message of the embodiment according to the application；
Fig. 4 shows a kind of original sub-frame structure of GPS L5 signal of the embodiment according to the application, rolls up through continuous
Subframe structure and the new structure subframe structure including pseudo- frame head after long-pending coding；
Fig. 5 shows a kind of block diagram of the decoding apparatus of the navigation message of the embodiment according to the application；And
Fig. 6 shows the block diagram of the decoding apparatus of the navigation message of the another embodiment according to the application.
Specific embodiment
With reference to the accompanying drawings the coding/decoding method and decoding apparatus of navigation message disclosed in the present application is described in detail.For
For the sake of simple and clear, in the explanation of each embodiment of the application, same or similar device employs same or analogous reference.
Illustrate below taking the L5 signal of GPS as a example.Fig. 1 shows the original text subframe structure of the L5 signal of GPS.
The original text subframe of L5 signal, every frame 300bit, including：The original preamble sequence of 8bit, 6bit satellite PRN-sequence,
262bit original navigation textual information, and 24bit original CRC check position.
The each frame of original text of the L5 signal of GPS is all complete, independent layout, but does not examine during continuous convolution coding
Consider the border between frame and frame, but all enter depositor as original bit stream sequential shift.The original text of L5 signal
After continuous convolution encoder (2,1,7) as shown in Figure 2 encodes, the text subframe of every frame 600bit will be obtained.Due to adopting
Use continuous convolution coded system, during every frame convolution, the original state of depositor does not reset, the CRC check position of previous frame also will participate in
The convolutional encoding process of next frame, the frame head after continuous convolution will be no longer fixed sequence program, and consecutive frame cannot be distinguished by, after coding
Each frame is no longer independent, thus also cannot carry out frame synchronization by the frame head after continuous convolution.
A kind of coding/decoding method of the navigation message of the embodiment according to the application, can be leading after continuous convolution coding
The subframe of avionics literary composition builds pseudo- frame head, carries out frame synchronization and decoding to navigation message.As shown in figure 3, in step 110, judge
Whether the coded system of navigation message is continuous convolution coding.If the coded system of navigation message is continuous convolution coding staff
Formula, in the step 120, determines the pseudo- frame head of the subframe of described navigation message, and according to determined by pseudo- frame head carry out frame synchronization；
If the coded system of navigation message is not continuous convolution coded system, in step 130, the subframe according to navigation message
Original fixing frame head carry out frame synchronization.In step 140, the navigation message after frame synchronization is entered with row decoding, obtains original leading
Boat textual information and check information.
According to a kind of embodiment, if the coded system of navigation message is continuous convolution coded system, in step 120
In, the subframe of described navigation message can be determined according to original preamble sequence, satellite number and continuous convolution coder structure
Pseudo- frame head.
Fig. 4 shows a kind of original sub-frame structure of GPS L5 signal of the embodiment according to the application, rolls up through continuous
Subframe structure and the new structure subframe structure including pseudo- frame head after long-pending coding.As shown in figure 4, original preamble sequence length is
8bit, the depositor number of continuous convolution encoder (2,1,7) is 6.Continuously rolled up with the front 6bit in original preamble sequence
Long-pending dwell vessel original state, i.e. the rear 6bit original CRC check position in previous frame is unknown, thus convolutionally encoded rear frame head
The data of on-fixed sequence 12bit in sequence is unknown, and the data of fixed sequence program 4bit is it is known that therefore after convolutional encoding
The length of the on-fixed sequence in preamble sequence is 12bit, and the length of fixed sequence program is 4bit.
Because, during conducting frame synchronization, the navigation signal being received is known that is to say, that navigating from which satellite
PRN in text is known.Therefore, according to presently filed embodiment, it is possible to use known satellite number, rebuild puppet
Frame head, carries out frame synchronization.For example, it is possible to by the satellite number after the fixed sequence program in preamble sequence after convolutional encoding and convolutional encoding
Combination, forms the pseudo- frame head of the subframe of navigation message.For example, for the L5 signal of GPS, when the after 6bit in previous frame is original
When depositor is released in CRC check position, i.e. it may be determined that the initial shape of depositor after the front 6bit of original frame head enters depositor
State.Subsequently, the remaining 2bit and 6bit satellite number of original frame head is pushed into frame head after obtained convolutional encoding after depositor
4bit fixed sequence program, and 12bit convolutionally encoded after satellite sequence known to.It is thus possible to by 4bit fixed sequence program
It is combined with the satellite sequence after 12bit convolutional encoding, forms the pseudo- frame head of navigation message subframe, by pseudo- frame head Lai real
Existing frame synchronization.
Additionally, according to presently filed embodiment, as shown in figure 4, can also be initiateed using pseudo- frame head as subframe, structure again
Build the subframe of navigation message.According to a kind of embodiment, the on-fixed sequence of preamble sequence in next frame can be filled into currently
Frame, to form new subframe.Now, the subframe structure of the new navigation message building include pseudo- frame head, navigation information, CRC check,
And on-fixed sequence.For the L5 signal of GPS, the new subframe lengths building are 600bit.According to another embodiment,
The on-fixed sequence in convolutionally encoded rear preamble sequence can be abandoned, to form new subframe.Now, the new navigation electricity building
The subframe structure of literary composition includes pseudo- frame head, navigation information and CRC check.For the L5 signal of GPS, abandon frame after convolutional encoding
12bit on-fixed sequence in header sequence, then the new subframe lengths building are 588bit.
According to a kind of embodiment, if the coded system of navigation message is not continuous convolution coded system, in step
In rapid 130, the original fixing frame head of the subframe according to navigation message carries out frame synchronization.Due to leading through discontinuous convolutional encoding
The frame head of the subframe of avionics literary composition is fixing, therefore can realize frame synchronization by this frame head.Subsequently, row decoding behaviour can be entered
Make., the text that its data channel is carried all employs the group of CRC check code and convolution taking the E5a signal of Galileo as a example
Close.But, the E5a signal of Galileo was also added with the fixing preamble sequence (0xB70) of 12bit before broadcasting, such that it is able to
Frame synchronization is realized by this fixation frame head, and subsequently the navigation message after frame synchronization is entered with row decoding, obtain original navigation text
Information and check information.Here, the decoded operation of navigation message similarly to the prior art, does not repeat to this.
According to a kind of embodiment, if the coded system of navigation message is continuous convolution coded system, step 140
Decoded operation can further include：Navigation message according to continuous convolution coder structure, original preamble sequence and structure
Subframe lengths, carry out deconvolution to the subframe of described navigation message, obtain original navigation textual information and check information.
Further, it is also possible to according to the subframe lengths of the navigation message after original preamble sequence, deconvolution and the school being obtained
Test information, the original navigation textual information being obtained is verified, obtain the original navigation textual information through verification.
For example, the GPS L5 signal for 600bit for the new subframe lengths building, when depositing of continuous convolution encoder
When device length is 6bit, deconvolution, from the beginning of (6 × 2+1=) 13 bit, obtains 294 effective bit, and is above filling
Initial 6bit in original frame head, thus obtain the subframe of the navigation message after the deconvolution that length is 300bit.Carrying out school
When testing, the initial value of verification sum is set to zero, then carries out CRC check again.
It is the GPS L5 signal of 588bit for the new subframe lengths building, when the register capacity of continuous convolution encoder
During for 6bit, deconvolution, from the beginning of (6 × 2+1=) 13 bit, obtains 294 effective bit, i.e. obtaining length is 294bit
Deconvolution after navigation message subframe.When carrying out CRC check, the initial value of verification sum is not zero, but by known former
6bit sequence in beginning frame head obtains through CRC check.
Present invention also provides a kind of decoding apparatus of navigation message.As shown in figure 5, decoding apparatus 200 include frame synchronization
Module 210 and decoding module 220.Frame synchronization module 210 judges whether the coded system of received navigation message is continuous
Convolutional encoding.When the coded system that frame synchronization module 210 judges navigation message is continuous convolution coded system, frame synchronization module
210 determination navigation messages subframes pseudo- frame head, and according to determined by puppet frame head carry out frame synchronization.When frame synchronization module 210
When to judge the coded system of navigation message be not continuous convolution coded system, frame synchronization module 210 is according to the subframe of navigation message
Original fixing frame head carry out frame synchronization.Decoding module 220 enters row decoding to the navigation message after frame synchronization, obtains original navigation
Textual information and check information.
According to a kind of embodiment, the frame synchronization module 210 of guider 200 can be according to original preamble sequence, satellite
Number and continuous convolution coder structure, determine the pseudo- frame head of the subframe of described navigation message.According to a kind of embodiment, frame
Synchronization module 210 can determine in preamble sequence after convolutional encoding according to original preamble sequence and continuous convolution coder structure
On-fixed sequence length, and determine the fixed sequence program in preamble sequence after convolutional encoding；Convolution is compiled by frame synchronization module 210
Fixed sequence program in preamble sequence after code is combined with the satellite number after convolutional encoding, forms the pseudo- frame head of the subframe of navigation message.
For example, for GPS L5 signal, 4bit fixed sequence program can be combined with the satellite sequence after 12bit convolutional encoding,
Form the pseudo- frame head of navigation message subframe, frame synchronization is realized by pseudo- frame head.
According to a kind of embodiment, if the coded system of navigation message is not continuous convolution coded system, decode mould
Block 220 can carry out frame synchronization according to the original fixing frame head of the subframe of navigation message.If the coded system of navigation message is
During continuous convolution coded system, decoding module 220 can carry out frame synchronization according to pseudo- frame head.
According to a kind of embodiment, decoding module 220 can be initial as the subframe of described navigation message using pseudo- frame head,
Rebuild the subframe of navigation message.For example, it is possible to abandon the 12bit on-fixed sequence in preamble sequence after convolutional encoding, from
And the subframe lengths newly building are 588bit.The subframe lengths that newly build can also be kept to be 600bit, and by frame in next frame
The on-fixed sequence of header sequence fills into present frame, to form new subframe.
According to a kind of embodiment, as shown in fig. 6, decoding module 220 includes uncoiling volume module 221.Uncoiling volume module 221
According to the subframe lengths of continuous convolution coder structure, original preamble sequence and the navigation message rebuilding, to rebuilding
The subframe of navigation message carry out deconvolution, obtain original navigation textual information and check information.
According to a kind of embodiment, as shown in fig. 6, decoding module 220 includes correction verification module 222.Correction verification module 222 basis
The subframe lengths of the navigation message after original preamble sequence, deconvolution and the check information being obtained, original are led to obtain
Boat textual information is verified, and obtains the original navigation textual information through verification.
It is appreciated that according to the navigation signal coding/decoding method of the application and decoding apparatus, by building pseudo- frame head, can locate
The signal coded by continuous convolution coded system that will adopt in reason navigation signal of future generation.Additionally, leading according to the application
Boat signal decoding method and decoding apparatus, can also leading the navigation signal of continuous convolution coded system and other coded systems
Boat signal is unified under common process framework, realizes decoding operate.So, the navigation message of receiver processes framework and can protect
Hold consistent, the navigation message of compatible multi-form is processed, be easy to safeguard and change.
Above by reference to accompanying drawing, the exemplary embodiment of the application is described.Those skilled in the art should manage
Solution, the purpose that the embodiment above is merely to illustrate that and the example lifted, rather than be used for being limited, all in the application
Teaching and claims under made any modification, equivalent etc., should be included in this application claims
In the range of.
Claims (12)
1. a kind of coding/decoding method of navigation message, described coding/decoding method includes：
Received navigation message is carried out with frame synchronization, the step of described frame synchronization further includes：
Whether the coded system judging described navigation message is continuous convolution coding,
When the coded system of described navigation message is continuous convolution coded system, determine the pseudo- frame of the subframe of described navigation message
Head, and according to determined by pseudo- frame head carry out frame synchronization,
When the coded system of described navigation message is not continuous convolution coded system,
The original fixing frame head of the subframe according to described navigation message carries out frame synchronization；And
Navigation message after frame synchronization is entered with row decoding, obtains original navigation textual information and check information,
The wherein said step determining pseudo- frame head includes：
According to original preamble sequence and continuous convolution coder structure, determine the on-fixed sequence in preamble sequence after convolutional encoding
Length, and determine the fixed sequence program in preamble sequence after convolutional encoding；
Fixed sequence program in preamble sequence after convolutional encoding is combined with the satellite number after convolutional encoding, forms described navigation message
Subframe pseudo- frame head.
2. coding/decoding method as claimed in claim 1, also includes：Pseudo- frame head is initial as the subframe of described navigation message,
Rebuild the subframe of navigation message.
3. coding/decoding method as claimed in claim 2, wherein, the subframe structure of the described navigation message rebuilding includes：Pseudo-
Frame head, navigation information, CRC check and on-fixed sequence.
4. coding/decoding method as claimed in claim 2, wherein, the subframe structure of the described navigation message rebuilding includes：Pseudo-
Frame head, navigation information, CRC check.
5. coding/decoding method as claimed in claim 2, wherein, when the coded system of described navigation message is continuous convolution coding staff
During formula, the step of described decoding includes：
According to the subframe lengths of continuous convolution coder structure, original preamble sequence and the navigation message rebuilding, to described
The subframe of the navigation message rebuilding carries out deconvolution, obtains original navigation textual information and check information.
6. coding/decoding method as claimed in claim 5, wherein, when the coded system of described navigation message is continuous convolution coding staff
During formula, the step of described decoding also includes：
Subframe lengths according to the navigation message after original preamble sequence, deconvolution and the check information being obtained, to being obtained
Original navigation textual information verified, obtain through verification original navigation textual information.
7. a kind of decoding apparatus of navigation message, described decoding apparatus include：
Frame synchronization module, described frame synchronization module judges whether the coded system of received navigation message is that continuous convolution is compiled
Code, when the coded system of described navigation message is continuous convolution coded system, determines the pseudo- frame of the subframe of described navigation message
Head, and according to determined by pseudo- frame head carry out frame synchronization, when the coded system of described navigation message is not continuous convolution coding staff
During formula, the original fixing frame head of the subframe according to described navigation message carries out frame synchronization；And
Decoding module, described decoding module enters row decoding to the navigation message after frame synchronization, obtain original navigation textual information and
Check information,
Wherein, described frame synchronization module, according to original preamble sequence and continuous convolution coder structure, determines frame after convolutional encoding
The length of the on-fixed sequence in header sequence, and determine the fixed sequence program in preamble sequence after convolutional encoding；Described frame synchronization mould
Fixed sequence program in preamble sequence after convolutional encoding is combined by block with the satellite number after convolutional encoding, forms described navigation message
The pseudo- frame head of subframe.
8. decoding apparatus as claimed in claim 7, wherein, described decoding module using pseudo- frame head as described navigation message son
Initiateing of frame, rebuilds the subframe of navigation message.
9. decoding apparatus as claimed in claim 8, wherein, the subframe structure of the navigation message that described decoding module rebuilds
Including：Pseudo- frame head, navigation information, CRC check and on-fixed sequence.
10. decoding apparatus as claimed in claim 8, wherein, the subframe knot of the navigation message that described decoding module rebuilds
Structure includes：Pseudo- frame head, navigation information and CRC check.
11. decoding apparatus as claimed in claim 8, wherein, described decoding module includes uncoiling volume module, described uncoiling product module
Tuber according to the subframe lengths of continuous convolution coder structure, original preamble sequence and the navigation message rebuilding, to described heavy
The subframe of the new navigation message building carries out deconvolution, obtains original navigation textual information and check information.
12. decoding apparatus as claimed in claim 11, wherein, described decoding module also includes correction verification module, described calibration mode
Tuber according to the subframe lengths of the navigation message after original preamble sequence, deconvolution and the check information being obtained, to obtained
Original navigation textual information is verified, and obtains the original navigation textual information through verification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510083604.1A CN104698479B (en) | 2015-02-16 | 2015-02-16 | The coding/decoding method of navigation message and decoding apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510083604.1A CN104698479B (en) | 2015-02-16 | 2015-02-16 | The coding/decoding method of navigation message and decoding apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104698479A CN104698479A (en) | 2015-06-10 |
| CN104698479B true CN104698479B (en) | 2017-03-01 |
Family
ID=53345800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510083604.1A Active CN104698479B (en) | 2015-02-16 | 2015-02-16 | The coding/decoding method of navigation message and decoding apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104698479B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104991263A (en) * | 2015-06-29 | 2015-10-21 | 中国电建集团成都勘测设计研究院有限公司 | Method for performing satellite positioning signal resolution |
| CN110007325B (en) * | 2019-04-15 | 2022-09-13 | 中国电子科技集团公司第二十研究所 | Rapid frame synchronization method for satellite-based enhanced L5 signal |
| CN110907957B (en) * | 2019-10-23 | 2022-04-01 | 深圳华大北斗科技股份有限公司 | Signal demodulation method, signal demodulation device, computer equipment and storage medium |
| CN110764112B (en) * | 2019-11-14 | 2021-08-03 | 北京理工大学 | Method for improving text formatting |
| CN117452455B (en) * | 2023-12-26 | 2024-03-12 | 中国人民解放军国防科技大学 | Method for designing text decoding module of navigation receiver for embedded test |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780197A (en) * | 2004-11-25 | 2006-05-31 | 中国传媒大学信息工程学院 | Self-adaptive mixed channel coding-decoder and method thereof |
| CN101247201A (en) * | 2007-02-13 | 2008-08-20 | 华为技术有限公司 | Synchronous frame transmitting and receiving method, detecting system and transmitting terminal, receiving terminal equipment |
| CN101604011A (en) * | 2008-06-13 | 2009-12-16 | 联发科技股份有限公司 | The sync detection device of global navigational satellite system receiver and method |
| CN101634696A (en) * | 2008-07-23 | 2010-01-27 | 中国科学院国家天文台 | Signal processing method for GPS/CAPS double-module combination receiver |
| CN102510323A (en) * | 2011-09-22 | 2012-06-20 | 航天科工惯性技术有限公司 | Frame identifying method for serial data |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7738582B2 (en) * | 2005-03-02 | 2010-06-15 | Rohde & Schwarz Gmbh & Co. Kg | Apparatus, systems and methods for producing coherent symbols in a single frequency network |
-
2015
- 2015-02-16 CN CN201510083604.1A patent/CN104698479B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1780197A (en) * | 2004-11-25 | 2006-05-31 | 中国传媒大学信息工程学院 | Self-adaptive mixed channel coding-decoder and method thereof |
| CN101247201A (en) * | 2007-02-13 | 2008-08-20 | 华为技术有限公司 | Synchronous frame transmitting and receiving method, detecting system and transmitting terminal, receiving terminal equipment |
| CN101604011A (en) * | 2008-06-13 | 2009-12-16 | 联发科技股份有限公司 | The sync detection device of global navigational satellite system receiver and method |
| CN101634696A (en) * | 2008-07-23 | 2010-01-27 | 中国科学院国家天文台 | Signal processing method for GPS/CAPS double-module combination receiver |
| CN102510323A (en) * | 2011-09-22 | 2012-06-20 | 航天科工惯性技术有限公司 | Frame identifying method for serial data |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104698479A (en) | 2015-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104698479B (en) | The coding/decoding method of navigation message and decoding apparatus | |
| RU2014118745A (en) | DEVICE AND METHOD FOR SENDING AND RECEIVING DATA IN COMMUNICATION / BROADCASTING SYSTEM | |
| Fernández‐Hernández et al. | High‐parity vertical Reed‐Solomon codes for long GNSS high‐accuracy messages | |
| Schotsch et al. | Joint time-to-CED reduction and improvement of CED robustness in the Galileo I/NAV message | |
| CN105897376B (en) | Decoder decoding performance test method and device | |
| CN106612555A (en) | Communication system frame number transmission method, determination method and device | |
| CN104639294A (en) | Improved CRC (Cyclic Redundancy Check) realization method | |
| CN205545212U (en) | Manchester code's codec based on FPGA | |
| CN106506010B (en) | A kind of LDPC encoder compatible based on DVB-S2 standard multi code Rate of Chinese character | |
| US11448772B2 (en) | Transmission of satellite navigation message into multiple pages encoded for optimal retrieval at receiver in a fully interchangeable way | |
| CN109001760A (en) | A kind of low orbit satellite radio news program expression | |
| CN104935923B (en) | Coding method and system, signal decoding method and system | |
| CN111988272B (en) | Design method of navigation message transmission protocol suitable for ground-based pseudolite | |
| US8509359B2 (en) | Multi-channel sequential Viterbi decoder | |
| CN107505637B (en) | Hot start positioning method based on relative pseudo-range | |
| US8887031B2 (en) | Error correcting method, error correcting apparatus, sending device, receiving device, and error correcting program | |
| CN112698366B (en) | Frame synchronization method for satellite positioning receiver | |
| EP3258291A1 (en) | Techniques for transmitting and receiving gnss navigation messages | |
| CN110764112B (en) | Method for improving text formatting | |
| CN101526893B (en) | Method and device for parallelly executing instructions of very long instruction words | |
| CN102201881B (en) | Blind identification method of convolutional interleaving | |
| CN111596328A (en) | Data time sequence control method of GNSS masker receiver | |
| CN110535554A (en) | A kind of coding and decoding method and device of data block | |
| CN101321035A (en) | Difference value toplimit acquiring method, point fixing method and apparatus | |
| CN115001623B (en) | Method and device for checking vehicle-mounted electronic map data |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |