CN101246207B - Implementing method for generating data code stream after scrambling in GPS disturbance system - Google Patents
Implementing method for generating data code stream after scrambling in GPS disturbance system Download PDFInfo
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Abstract
The invention discloses a method for producing ''data code flow after scrambling'' for GPS interference system. The invention can dependently and uninterruptedly produce multi-channel ''GPS navigation text data code flow after scrambling the C/A code'' which can be used for producing multi-channel GPS positioning interfering signals. The method is based on the system which is build by field programmable gate array (FPGA) and single chip (MSP 430 etc.), and realizes multi-channel GPS navigation text information introduction, parameter configuration, test information feedback, circulating correction of introduced multi-channel GPS navigation text data frames (1500 bit per frame) and update (including Z counter and parity check), further realizes independent, uninterrupted and parallel output of multi-channel ''GPS navigation text data code flow after scrambling the C/A code''. The invention has the advantages of independency, uninterrupted ability, paralleled ability, changeability and testability. The invention is used for realizing GPS signal interference in local area. The invention can be widely applied in the field of army and information security.
Description
Technical field:
The present invention relates to the data-signal perturbation technique in the GPS communication and navigation, particularly be used for the implementation method that the GPS EVAC (Evacuation Network Computer Model) independently, uninterruptedly produces multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number " (i.e. " data code flow after the scrambling ").
Background technology:
GPS (Global Positioning System, global location navigational system) has been widely used in various fields all over the world.US military also mainly adopts military gps system to finish precision strike to target.Under the situation that gps satellite is ubiquitous, the gps satellite receiver is widely used now, how realizing breaking through gps system becomes an important topic.In September, 1994, in the show-and-tell first of Experiment of Applied Physics chamber, U.S. Johns Hopkins University a kind of self-control GPS jammer of cigarette case size.This device can disturb the GPS receiver of any employing CA coding in radius 16 kilometer range.The then heavily about 3-10 kilogram of cheap GPS jammer (not containing battery) of Russia's design, price is lower than 50,000 dollars, can implement effectively to disturb to four frequency ranges of the existing gps system of the U.S..
How Base-Band Processing part in the GPS EVAC (Evacuation Network Computer Model), main existence realize that multichannel reality (or artificial) gps navigation message information importings/storage, multiple satellite parametric reduction adjustment, detection information are in time fed back, the circulation of the timely circulation correction of gps navigation message and renewal, multichannel " data code flow after the scrambling "/uninterruptedly/and design challenges such as line output.
In order to solve the design challenges of the Base-Band Processing part in the above GPS EVAC (Evacuation Network Computer Model), the present invention designs and provides the way of obtaining of complete, the practical GPS EVAC (Evacuation Network Computer Model) baseband signal of a cover.
Summary of the invention:
The purpose of this invention is to provide the implementation method that a kind of GPS of being used for EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling ".This method can be used for independently, uninterruptedly producing multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number ", thereby for the GPS EVAC (Evacuation Network Computer Model) provides continuous imitative gps satellite baseband signal, can be used to realize the interior interference to gps signal of local scope.Fields such as that this invention can be widely used in is military, information security.
Complete technical scheme of the present invention is as follows:
Described be used for implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " on hardware based on field programmable gate array (FPGA) and single-chip microcomputer (MSP430 etc.), the application system structural drawing sees also accompanying drawing 1.
Realize multichannel (or title " hyperchannel ") gps navigation message information importing, parameter configuration and detection information feedback by serial ports, automatically finish circulation correction and renewal (comprising Z counter and parity checking) by single-chip microcomputer (MSP430 etc.) again to gps navigation message, generate corresponding multichannel C/A sign indicating number (Coarse/Acqisition Code) sequence by field programmable gate array (FPGA) at last, finish the circulation to scrambling of multichannel gps navigation message and data code flow, uninterrupted and line output simultaneously.
The variable element that said process relates to comprises: satellite numbering, C/A code phase starting point, C/A bit rate, navigation message origin coordinates, navigation message start-up time and Z counter starting point.
This inventive method specifically also is divided into following technical step according to the different technologies effect that can realize:
(1) produces step parallel, multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number "; This step comprises:
Step is 1.: realize that by serial ports multichannel gps navigation message information imports;
Because the quantity of information bigger (every satellite 25 frame * 1500bit) of multichannel gps navigation message, in order better to store and write down original navigation message information, this step design is integrated the source document that imports, adopt sexadecimal 0x000x000x000x000x000x000x000x000x000x000x000x000x000x00 0x000x0A to isolate the gps navigation message of different satellites (different passage), what a wherein last byte 0x0A represented follow-up gps navigation message defends asterisk (according to real satellite number different variable).Finish by single-chip microcomputer (MSP430F149) the whole frame of 8 road gps navigation messages is distinguished and storage.The initial data flow graph sample of each satellite of the present invention's design is referring to accompanying drawing 2.Wherein, 00～90 row: 1～10 row, 00 byte, a0 is capable: last byte represents to defend asterisk (0x0A-represents satellite 10).
Step is 2.: finish single channel/hyperchannel parameter configuration and detect information feedback;
In this method and the flow process of serial ports of computers command interaction, referring to accompanying drawing 3.The command format of each design, referring to subordinate list (1～12) and accompanying drawing 2:
1) removes MSP430 navigation message memory block command format, see attached list 1;
| The order implication | The order sign | Data field (8) |
| Remove the navigation message memory block | 0x2222? | 0x88? |
Subordinate list 1
2) remove successful response format, see attached list 2;
| The order implication | The order sign | Data field (16) |
| Remove successfully | 0x2222? | 0x880F? |
Subordinate list 2
3) download navigation message format (need to send out earlier the 0x222288 order and remove Flash, just can send to MSP430 by PC) is seen accompanying drawing 2;
4) download navigation text success response form sees attached list 3;
| The order implication | The order sign | Data field (16) |
| The success of download navigation text | 0x6788? | 0x880F? |
Subordinate list 3
5) configuration code generator command format sees attached list 4;
Subordinate list 4
6) configuration code generator success response form sees attached list 5;
| The order implication | The order sign | Data field (16) |
| The success of configuration code generator | 0x8a33? | 0x000F? |
Subordinate list 5
7) dispose 8 channel command forms simultaneously, see attached list 6;
| The order sign | Channel number 0 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| 16 0x 9b 11 | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
| ? | Channel number 1 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| ? | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
| ? | Channel number 2 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| ? | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
| ? | Channel number 3 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| ? | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
| ? | Channel number 4 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| ? | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
| ? | Channel number 5 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| ? | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
| ? | Channel number 6 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| ? | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
| ? | Channel number 7 | The satellite numbering | C/A code phase starting point | C/A bit rate correction | The navigation message origin coordinates | Navigation message start-up time | Z counts starting point |
| ? | 8 | 8 | 16 | 8 | 24 | 8 | 24 |
Subordinate list 6
Wherein, order sign: 0x 9b 11,8 satellite parametric reductions that can be linked in sequence, the passage ordering can exchange, and sample (16 system) is used in order:
9b?11?00?0a?00?00?00?01?00?00?00?01?1A?B8?01?0B?00?00?00?00?00?00?00?01?3BEC?02?11?00?00?00?00?00?00?00?01?42?C2?03?12?00?00?00?00?00?00?00?01?42?C2?0402?00?00?00?00?00?00?00?01?42?C2?05?16?00?00?00?00?00?00?00?01?42?C2?06?03?0000?00?00?00?00?00?01?34?1C?07?04?00?00?00?00?00?00?00?01?1A?B8
8) dispose 8 channel command success response forms simultaneously, see attached list 7;
| The order implication | The order sign | Data field (8 bytes are defended asterisk for 8 of the expression actual disposition) | The tail field |
| Dispose 8 channel command successes simultaneously | 0x9b?11? | 0x0A?0B?11?12?02?16?03?04 | 0x0F? |
Subordinate list 7
9) start code generator command format (8 passages of 8 bit representations, every bit are put 1 expression and started), see attached list 8;
| The order implication | The order sign | Channel number (8 passages of 8 bit representations) |
| Start code generator | 0x3a?56 | 8 X x x x x x x x |
Subordinate list 8
10) start code generator success response form, see attached list 9;
| The order implication | The order sign | Channel number | Trail byte |
| Start the code generator success | 0x3a?56 | 8 X x x x x x x x | 0x?0F? |
Subordinate list 9
11) stop code generator command format (8 passages of 8 bit representations, every bit are put 1 expression and stopped) seeing attached list 10;
| The order implication | The order sign | Channel number (8 passages of 8 bit representations) |
| The stop code generator | 0x?d4?a1? | 8 X x x x x x x x |
[0048]Subordinate list 10
12) stop code generator success response form sees attached list 11;
| The order implication | The order sign | Channel number | Trail byte |
| The success of stop code generator | 0x?d4?a1? | 8 X x x x x x x x | 0x?0F? |
Subordinate list 11
13) navigation message command format among the output Flash sees attached list 12;
| The order implication | The order sign | Data field (8) |
| Navigation message order among the output Flash | 0x71?88? | 0x0A (required output navigation message defend asterisk) |
Subordinate list 12
Step is 3.: finish each subframe by single-chip microcomputer (MSP430F149) and read, each field circulation is revised and is upgraded and (comprises Z counter and parity checking etc., concrete correction algorithm sees also " Navstar GPSSpace Segment/Navigation User Interfaces (IS-GPS-200D) " (by Space and MissileSystems Center (SMC) and Navstar GPS Joint Program Office (GP) establishment, in November, 2004) in about the gps navigation message analysis part), more revised navigation message information and configuration parameter are uploaded to FPGA by SPI (Synchronous Peripheral Interface) mouth.
Step is 4.: FPGA generates corresponding multichannel C/A sign indicating number (Coarse/AcqisitionCode) sequence according to configuration parameter, and finish to the scrambling of multichannel gps navigation message and and line output (C/A sign indicating number generator polynomial and scrambling algorithm see also " GPS navigation principle and application ", Wang Huinan writes, Science Press).After adopting this method, FPGA is without the navigation message of storing excess, directly by and MSP between timing (6 seconds) mutual (the broadcasting speed of the navigation message after the scrambling is 50bit/s) of finishing new navigation message subframe (300bit), just can realize exporting as required the gps navigation message data code flow after the scrambling.FPGA project organization figure in this method is referring to accompanying drawing 4.
(2) step of generation " independence " multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number ";
The navigation message that the multichannel that design will " actual or artificial establishment " in this step is complete (25 pages on every satellite, every page of 5 subframes, each subframe 300bit.FPGA is the navigation message of storing excess not, directly by and MSP between regularly (6 seconds) finish the mutual of " the new navigation message subframe (300bit) " of preparing output.) be uploaded to MSP430F149 by serial ports after (import form and see accompanying drawing 2), finish the multiline message arrangement, deposit by MSP430F149 again, and finish the correlation parameter configuration by serial ports.Owing to stored " complete " navigation message (ephemeris of whole 24 satellites) of multi-satellite in the single-chip microcomputer, so fully can " independence " work.As long as after the configuration correlation parameter information, system's electrifying startup gets final product " independence " according to existing gps navigation message output " data code flow after the scrambling ".This provides complete dpch signal for the final GPS interference source of " flexible, motor-driven " of realizing.
(3) step of generation " uninterruptedly " multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number ";
The Z count value that imports and be stored in the navigation message in the single-chip microcomputer is invalid (the Z count value circulation in the actual gps satellite signal adds up).This method invention is for the emulation truth, and design is in the navigation message output procedure, and first Z count value that MSP430F149 regularly gets is replaced by given Z counter origin parameters, and each Z count value all adds 1 on the basis of previous Z count value thereafter.Simultaneously, MSP430F149 is responsible for finishing because the correction of the respective field check code that the variation of Z count value causes.System contains data code flow of whole navigation message information with regard to can circulate " continual " correct output like this.
In addition, the present invention is also by designing and disposing 6 kinds of system's variable elements and adjust the navigation message data code flow.The purpose of doing like this is that the actual conditions according to gps satellite signal can better simulate true gps signal environment by parameter adjustment.Wherein said 6 kinds of system's variable elements are respectively satellite numbering, C/A code phase starting point, C/A bit rate, navigation message origin coordinates, navigation message start-up time and Z counting starting point.The technical characterictic of these parameters is as follows:
1) satellite numbering: 8 codings are used to indicate the C/A code generator to generate the C/A sign indicating number code stream of corresponding satellite;
2) C/A code phase starting point: 16 codings, 0～1022, be used to indicate the C/A sign indicating number of code generator to export starting point;
3) C/A bit rate: 8 codings, design/-correction 100bps;
4) the navigation message origin coordinates (X, Y): 8 codings of X capable (1～125), Y is listed as (1～300) 16 codings;
5) navigation message start-up time: 8 codings, C/A sign indicating number idle period before the first bit navigation message output;
6) Z counting starting point: 24 codings, 17 are effectively, and each subframe circulation adds 1.
Concrete use of above parameter and implementation method see also " GPS navigation principle and application ", and Wang Huinan writes, Science Press.
In addition, also provide the mode of " after the scrambling " and " before the scrambling " information of exporting gps navigation message simultaneously in the technical scheme of the present invention, for Data Detection is offered help.By 2 hardware interfaces are provided simultaneously, be used for output " after the scrambling " and " before the scrambling " information, can better realize Data Detection like this, and prepare for GPS disturbs.Interface layout is referring to accompanying drawing 1.
The present invention has also designed the function that " 0 passage " serial ports feeds back demonstration " navigation message of the data code flow correspondence of exporting " automatically, can be used for the detection of data code flow information easily.By when producing " data code flow after the scrambling ",, feed back demonstration " navigation message of the data code flow correspondence of exporting " automatically by MSP430 control serial ports at " 0 passage ".Like this can by computing machine intuitively, the effectively observation and the output procedure of control data code stream.In actual the use, can be with different satellite configuration to " 0 passage ", to observe the output of its data code flow corresponding informance.
Beneficial effect of the present invention is as follows:
1, independence: " data code flow after the scrambling " based on the gps navigation message and the correlation parameter of initial importing, can independently finish the work fully, do not rely on " reality " gps signal.Gps navigation message that imports and correlation parameter can be worked out " artificially ", thereby can become the pith of GPS interference source.This method has designed the command format and the workflow of " single channel and hyperchannel parameter configuration ", " remove, import and the storage navigation message ", " starting and stop to export the C/A code stream ", " navigation message of storing among the output FLASH " etc. for this reason.
2, continuity: finished circulation correction and renewal (comprising Z counter and parity checking) in this method design to the multichannel gps navigation message Frame (every frame 1500bit) that has imported, thereby can secundum legem gps navigation message form, realize the uninterrupted output of " data code flow after the scrambling ".
3, concurrency: this method output " multichannel " data code flow that can " walk abreast ".Promptly can copy the deceptive information that generates multi-satellite simultaneously.
4, changeability: this method design " data code flow after the scrambling " can change according to the difference of following 6 kinds of parameters, comprising: satellite numbering, C/A code phase starting point, C/A bit rate, navigation message origin coordinates, navigation message start-up time and Z counting starting point.
5, easy detection property: this method not only can be exported " after the scrambling " information of gps navigation message, and also design output " before the scrambling " information simultaneously detects to be used for information.In addition, also design the function that " 0 passage " serial ports feeds back demonstration " navigation message of the data code flow correspondence of exporting " automatically, can be used for the detection of " data code flow after the scrambling " corresponding informance easily.
Independent, uninterrupted multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number " that above-mentioned technological merit the present invention not only can effectively produce, and multiple detection means can also be provided, can be applicable in the GSP EVAC (Evacuation Network Computer Model).
Description of drawings:
Further specify the present invention below in conjunction with the drawings and specific embodiments.
Fig. 1 is the applied system architecture synoptic diagram of the present invention.
Fig. 2 is the initial data flow graph sample synoptic diagram of every satellite after the integration of the original navigation message of multichannel.
Fig. 3 is the code generator involved in the present invention and the interactive interface synoptic diagram of PC.
Fig. 4 is FPGA project organization figure involved in the present invention.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the present invention.
According to technical scheme in the foregoing invention content and principle, the inventive method when specific implementation by importing a difficult problem that solves the Base-Band Processing part in the GPS EVAC (Evacuation Network Computer Model) by designed " C/A sign indicating number and the navigation message generator " that goes out of this method.
This performing step is as follows:
1. build application system according to system construction drawing (referring to accompanying drawing 1), MSP430 and FPGA are interconnected by the SPI interface;
2.MSP430 need the interconnection of design serial ports and PC to import and parameter configuration to realize complete navigation message.Need simultaneously to finish relevant indication and navigation message correction according to the parameter of configuration;
Indicate 3.FPGA obtain the parameter of MSP430 by the SPI interface, and according to correlation parameters such as indication configuration C/A sign indicating number generations;
4.FPGA regularly sent interruption in 6 seconds, circulated, uninterruptedly read the revised navigation message that MSP430 provides (1 subframe, 300bit);
5.FPGA finish to the C/A sign indicating number scrambling of this navigation message and output (export after the scrambling simultaneously and before the scrambling data code flow), each subframe 6 seconds.
More than show and described ultimate principle of the present invention and principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the instructions just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (10)
1. be used for the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling ", this method is based on field programmable gate array and single-chip microcomputer, it is characterized in that, realize the importing of multichannel gps navigation message information, parameter configuration and detection information feedback by serial ports, automatically finish circulation correction and renewal by single-chip microcomputer again to gps navigation message, generate corresponding multichannel C/A sign indicating number sequence by field programmable gate array at last, finish the circulation to scrambling of multichannel gps navigation message and data code flow, uninterrupted and line output simultaneously.
2. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 1, it is characterized in that, produce technical step parallel, multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number " and comprise:
1. realize that by serial ports multichannel gps navigation message information imports;
2. finish single channel/hyperchannel parameter configuration and detect information feedback;
3. by single-chip microcomputer MSP430F149 finish that each subframe reads, each field circulation is revised and upgrade, and more revised navigation message information and configuration parameter is uploaded to FPGA by the SPI mouth;
4. FPGA generates corresponding multichannel C/A sign indicating number sequence according to configuration parameter, and finishes scrambling of multichannel gps navigation message and and line output.
3. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 2, it is characterized in that, 1. described step specifically is that the source document that imports is integrated, adopt sexadecimal 0x00 0x00 0x00 0x00 0x00 0x000x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x0A to isolate the gps navigation message of different satellites/different passages, a wherein last byte 0x0A represents the asterisk of defending of follow-up gps navigation message; Finish by single-chip microcomputer MSP430F149 the whole frame of 8 road gps navigation messages is distinguished and storage.
4. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 2, it is characterized in that step is 2. described to be finished single channel/hyperchannel parameter configuration and detect information feedback and specifically be meant flow process with the serial ports of computers command interaction; These command formats comprise:
1) removes MSP430 navigation message memory block command format;
2) remove successful response format;
3) download navigation message format;
4) download navigation text success response form;
5) configuration code generator command format;
6) configuration code generator success response form;
7) dispose 8 channel command forms simultaneously;
8) dispose 8 channel command success response forms simultaneously;
9) start the code generator command format;
10) start code generator success response form;
11) stop code generator command format;
12) stop code generator success response form;
13) navigation message command format among the output Flash.
5. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 1, it is characterized in that, the technical step that produces " independence " multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number " specifically is the complete navigation message of multichannel with " actual or artificial establishment ", after being uploaded to MSP430F149 by serial ports, finish the multiline message arrangement, deposit by MSP430F149 again, and finish the correlation parameter configuration by serial ports; By the time after having stored " complete " navigation message of multi-satellite in the single-chip microcomputer and having disposed correlation parameter information, system's electrifying startup, just can " independence " export " data code flow after the scrambling ", for the final GPS interference source of " flexible, motor-driven " of realizing provides complete dpch signal according to existing gps navigation message.
6. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 5, it is characterized in that, the data of the navigation message that the multichannel of described " actual or artificial establishment " is complete are 25 pages on every satellite, every page of 5 subframes, each subframe 300 bit.FPGA is the navigation message of storing excess not, directly by and MSP between regularly finished the mutual of " the new navigation message subframe (300bit) " of preparing output in 6 seconds.
7. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 1, it is characterized in that, the technical step that produces " uninterruptedly " multichannel " gps navigation message data code flow after the scrambling of C/A sign indicating number " specifically is in the navigation message output procedure, first Z count value that MSP430F149 regularly gets is replaced by given Z counter origin parameters, and each Z count value all adds 1 on the basis of previous Z count value then; MSP430F149 is responsible for finishing because the correction of the respective field check code that the variation of Z count value causes simultaneously; System contains data code flow of whole navigation message information with regard to can circulate " continual " correct output like this.
8. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 1, it is characterized in that the present invention also designs and dispose 6 kinds of system's variable elements in order to adjust the navigation message data code flow;
The technical characterictic of these parameters is as follows:
1) satellite numbering: 8 codings are used to indicate the C/A code generator to generate the C/A sign indicating number code stream of corresponding satellite;
2) C/A code phase starting point: 16 codings, 0～1022, be used to indicate the C/A sign indicating number of code generator to export starting point;
3) C/A bit rate: 8 codings, design+/-correction 100bps;
4) the navigation message origin coordinates (X, Y): capable 8 codings of X, 16 codings of Y row;
5) navigation message start-up time: 8 codings, C/A sign indicating number idle period before the first bit navigation message output;
6) Z counting starting point: 24 codings, 17 are effectively, and each subframe circulation adds 1.
9. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 1, it is characterized in that, the mode of " after the scrambling " and " before the scrambling " information of exporting gps navigation message simultaneously also is provided in the technical scheme of the present invention; By 2 hardware interfaces are provided simultaneously, be used for output " after the scrambling " and " before the scrambling " information, can better realize Data Detection like this, and prepare for GPS disturbs.
10. according to the implementation method that the GPS EVAC (Evacuation Network Computer Model) produces " data code flow after the scrambling " that is used for of claim 1, it is characterized in that the present invention has also designed the function that " 0 passage " serial ports feeds back demonstration " navigation message of the data code flow correspondence of exporting " automatically; By when producing " data code flow after the scrambling ",, feed back demonstration " navigation message of the data code flow correspondence of exporting " automatically by MSP430 control serial ports at " 0 passage "; Computing machine intuitively, is effectively observed and the output procedure of control data code stream so that can pass through; In actual the use, can be with different satellite configuration to " 0 passage ", to observe the output of its data code flow corresponding informance.
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| CN105426149B (en) * | 2015-11-10 | 2019-05-17 | 恒宇信通航空装备(北京)股份有限公司 | A kind of graphic display card based on FPGA |
| CN110058270B (en) * | 2019-05-27 | 2020-10-27 | 中国人民解放军国防科技大学 | Navigation deception signal generation method based on clock error fitting |
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| CN1746696A (en) * | 2005-09-13 | 2006-03-15 | 武汉虹信通信技术有限责任公司 | Method for interfering satellite positioning system accuracy |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1746696A (en) * | 2005-09-13 | 2006-03-15 | 武汉虹信通信技术有限责任公司 | Method for interfering satellite positioning system accuracy |
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