CN104777496A - Method and device capable of peeling second-level code of receiver - Google Patents
Method and device capable of peeling second-level code of receiver Download PDFInfo
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- CN104777496A CN104777496A CN201510188828.9A CN201510188828A CN104777496A CN 104777496 A CN104777496 A CN 104777496A CN 201510188828 A CN201510188828 A CN 201510188828A CN 104777496 A CN104777496 A CN 104777496A
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- secondary code
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- 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
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
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- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
Abstract
The invention discloses a method and a device capable of peeling a second-level code of a receiver. The method comprises the following steps: determining a code phase of a second-level code receiving moment; setting the determined code phase of the second-level code receiving moment as an initial code phase of the second-level code; aligning the code phase of the second-level code receiving moment with a code phase of a locally-generated second-level code according to the set initial code phase of the second-level code; multiplying the locally-generated second-level code after alignment by a corresponding satellite signal to peel the second-level code. According to the technical scheme, the second-level code can be quickly peeled, so that the performance of a satellite navigation receiver is improved.
Description
Technical field
The present invention relates to field of satellite navigation, espespecially a kind of method and device realizing the stripping of receiver secondary code.
Background technology
In current existing satellite navigation system, for conventional civilian frequency, there is the several frequency of E1 of the B1 of the L1 of GPS (GPS, Global Positioning System), Beidou satellite navigation system (BDS), the L1 of GLONASS (GLONASS) system and GALILEO positioning system (Galileo).This wherein, except the L1 of GPS only uses the gold of 1023 chips and to use as one-level spreading code, all due to a variety of causes, there is secondary code in all the other systems in a variety of manners.L1 as GLONASS uses Meander code as secondary code; There is the secondary code of 25bit in the Q branch road of the E1 frequency of Galileo; Also has the NH code of the B1 frequency of BDS system, the NH code of the B1 frequency of BDS system is used on non-satellite mobile communication system (GEO) satellite, GEO satellite accounts for the overwhelming majority at present in BDS system, and also needs it to play Main Function in weak signal conditions.The acquisition sensitivity of non-GEO satellite directly can be improved about 7dB by the stripping of secondary code in theory, and the performance optimization for weak signal scene condition is extremely important.In existing Satellite Navigation Technique, also do not have special method of carrying out peeling off for secondary code, what this was serious have impact on the performance of satellite navigation receiver in weak signal scene.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of method and the device that realize the stripping of receiver secondary code, the quick stripping of secondary code can be realized, thus promote the performance of satellite navigation receiver.
In order to reach the object of the invention, the invention provides a kind of method realizing receiver secondary code and peel off, comprising:
Determine the code phase of the secondary code time of reception;
The code phase of the secondary code time of reception determined is set to the initial code phase positions of secondary code;
According to the initial code phase positions alignment secondary code time of reception of the secondary code arranged and the code phase of the local secondary code produced;
The secondary code that this locality after alignment produces is done product with corresponding satellite-signal calculate, to peel off secondary code.
Further, above-mentionedly determine that the code phase of secondary code time of reception comprises:
Obtain the secondary code sequence of the secondary code time of reception;
According to the length of the bit of the secondary code sequence determination secondary code sequence obtained;
According to the length of the secondary code sequence obtained with the bit of the described secondary code sequence determined, determine the code phase of the secondary code time of reception.
Further, the above-mentioned secondary code sequence according to obtaining and the length of the bit of the secondary code sequence determined, determine the code phase of the secondary code time of reception, comprising:
The secondary code sequence loops of the secondary code time of reception obtained is moved to right 1 bit secondary code sequence;
Obtain the relevant accumulated value of the corresponding numerical value of each 1 bit secondary code sequence that often moves to right and the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right successively;
The numerical value corresponding according to each the 1 bit secondary code sequence that often moves to right obtained and the relevant accumulated value of the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right, calculate the product accumulation of the secondary code of each 1 bit that often moves to right; The length of the bit of described secondary code sequence until moved to right;
Often move to right according to each calculating the product accumulation of secondary code of 1 bit, obtained the code phase of the secondary code time of reception by Discr..
Further, obtain the code phase of the secondary code time of reception above by Discr., comprising:
Identify the product accumulation of secondary code maximum in the product accumulation of the secondary code of each 1 bit that often moves to right;
The index value that the product accumulation of maximum secondary code is corresponding is the code phase of the secondary code time of reception.
Present invention also offers a kind of device realizing receiver secondary code and peel off, comprising: determination module, module, alignment module and strip module are set; Wherein,
Determination module, for determining the code phase of the secondary code time of reception;
Module is set, for the code phase of the secondary determined code time of reception being set to the initial code phase positions of secondary code;
Alignment module, for the code phase according to the initial code phase positions alignment secondary code time of reception of the secondary code arranged and the secondary code of local generation;
Strip module, the secondary code for being produced this locality after alignment does product with corresponding satellite-signal and calculates, to peel off secondary code.
Further, determination module comprises acquiring unit, length determination unit and moment determining unit;
Acquiring unit, for obtaining the secondary code sequence of the described secondary code time of reception;
Length determination unit, for determining the length of the bit of described secondary code sequence according to the secondary code sequence obtained;
Moment determining unit, for the length of the bit according to the secondary code sequence obtained and the described secondary code sequence determined, determines the code phase of the secondary code time of reception.
Further, moment determination module, specifically for:
The secondary code sequence loops of secondary code time of reception of described acquisition is moved to right 1 bit secondary code sequence;
Obtain the relevant accumulated value of the corresponding numerical value of each 1 bit secondary code sequence that often moves to right and the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right successively;
The numerical value corresponding according to each the 1 bit secondary code sequence that often moves to right obtained and the relevant accumulated value of the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right, calculate the product accumulation of the secondary code of each 1 bit that often moves to right; The length of the bit of described secondary code sequence until moved to right;
Often move to right according to each calculating the product accumulation of secondary code of 1 bit, obtained the code phase of the secondary code time of reception by Discr..
Further, described moment determining unit, specifically for:
Identify the product accumulation of secondary code maximum in the product accumulation of the secondary code of each 1 bit that often moves to right;
The index value that the product accumulation of maximum secondary code is corresponding is the code phase of the secondary code time of reception.
Technical solution of the present invention comprises: the code phase determining the secondary code time of reception; The code phase of the secondary code time of reception determined is set to the initial code phase positions of secondary code; According to the initial code phase positions alignment secondary code time of reception of the secondary code arranged and the code phase of the local secondary code produced; The secondary code that this locality after alignment produces is done product with corresponding satellite-signal calculate, to peel off secondary code.Technical scheme of the present invention, achieves the quick stripping of secondary code, thus improves the performance of satellite navigation receiver.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the process flow diagram that the present invention realizes the method that receiver secondary code is peeled off;
Fig. 2 is the structural representation that the present invention realizes the device that receiver secondary code is peeled off.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.
The object of the invention is the secondary code enabling to modulate in satellite navigation receiver stripping satellite-signal real-time, increase the coherent integration time of satellite-signal, the signal to noise ratio (S/N ratio) of effective raising satellite-signal, thus improve the acquisition sensitivity of satellite navigation receiver, make receiver more reliable and more stable under complexity dislikes scene slightly.
Fig. 1 is the process flow diagram that the present invention realizes the method that receiver secondary code is peeled off, and as shown in Figure 1, comprising:
Step 101: the code phase determining the secondary code time of reception.Specifically comprise:
Obtain the secondary code sequence in this moment;
According to the length of the bit of the secondary code sequence determination secondary code sequence obtained;
According to the length of the secondary code sequence obtained with the bit of the secondary code sequence determined, determine the code phase of the secondary code time of reception.
Wherein, according to the length of the secondary code sequence obtained with the bit of the secondary code sequence determined, determine the code phase of the secondary code time of reception, comprising:
The secondary code sequence loops of the secondary code time of reception obtained is moved to right 1 bit secondary code sequence;
Obtain the relevant accumulated value of the corresponding numerical value of each 1 bit secondary code sequence that often moves to right and the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right successively;
The numerical value corresponding according to each the 1 bit secondary code sequence that often moves to right obtained and the relevant accumulated value of the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right, calculate the product accumulation of the secondary code of each 1 bit that often moves to right; The length of the bit of described secondary code sequence until moved to right;
Often move to right according to each calculating the product accumulation of secondary code of 1 bit, obtained the code phase of the secondary code time of reception by Discr..
It should be noted that, about how move to right secondary code sequence the relevant accumulated value of satellite-signal that (how many bits) obtain the corresponding numerical value of secondary code sequence and correspond, belong to conventional techniques means well-known to those skilled in the art, be not used for limiting method of the present invention, do not repeat them here.
Wherein, obtained the code phase of the secondary code time of reception by Discr., comprising:
Identify the product accumulation of secondary code maximum in the product accumulation of the secondary code of each 1 bit that often moves to right;
The index value that the product accumulation of maximum secondary code is corresponding is the code phase of the secondary code time of reception.
Illustrate, suppose that the length of secondary code is Mbit, then need to move to right M time, obtain the product accumulation of M secondary code, the product aggregate-value of maximum secondary code is found in the product aggregate-value of this M secondary code, the index value that the product aggregate-value of this maximum secondary code is corresponding, is the code phase of the secondary code time of reception.Such as, for the secondary code sequence of a length M=20bit, the code phase of secondary code is 0,1,2 ... 19, if the index value that the product aggregate-value of the maximum secondary code now found is corresponding is 5, then show that the code phase of the secondary code in satellite signal receiving moment is 5, namely receiver is the secondary code received from the position that code phase is 5.
Step 102: by the code phase of secondary code time of reception determined, be set to the initial code phase positions of secondary code.
Step 103: according to the initial code phase positions alignment secondary code time of reception of the secondary code arranged and the code phase of the local secondary code produced.
It should be noted that, because the secondary code in satellite-signal is broadcast with the circulation of certain bit length, and the local secondary code produced also produces with same bits length, when the code phase of the secondary code determining the time of reception is 5 (mentioning receiver in upper example is the secondary code received from the position that code phase is 5), then need the code phase of the alignment secondary code time of reception and the local secondary code produced.Belong to conventional techniques means well-known to those skilled in the art about how to align, do not repeat them here.
Step 104: the secondary code that this locality after alignment produces is done product with corresponding satellite-signal and calculates, thus peel off secondary code.
It should be noted that, the secondary code how to produce according to this locality, obtains satellite-signal corresponding with it, belongs to conventional techniques means well-known to those skilled in the art, do not repeat them here.
The present invention is set to the initial phase value of secondary code by the code phase of the secondary code by the satellite signal receiving moment (i.e. secondary code the time of reception), and then by the code phase alignment of Signal reception moment with the local secondary code produced, and the secondary code that this locality after alignment produces is done product with corresponding satellite-signal and calculates, and then achieve the secondary code in the satellite-signal that receives is peeled off, coherent integration time is lengthened, effectively raises the acquisition sensitivity of receiver.
Fig. 2 is the structural representation of device that the present invention realizes receiver secondary code and peels off, and as shown in Figure 2, comprising: determination module, arrange module, alignment module and strip module.Wherein,
Determination module, for determining the code phase of the secondary code time of reception.
Wherein, determination module comprises acquiring unit, length determination unit and moment determining unit;
Acquiring unit, for obtaining the secondary code sequence of this secondary code time of reception;
Length determination unit, for determining the length of the bit of this secondary code sequence according to the secondary code sequence obtained;
Moment determining unit, for the length of the bit according to the secondary code sequence obtained and the secondary code sequence determined, determines the code phase of the secondary code time of reception.
Further, moment determination module, specifically for:
The secondary code sequence loops of the secondary code time of reception obtained is moved to right 1 bit secondary code sequence;
Obtain the relevant accumulated value of the corresponding numerical value of each 1 bit secondary code sequence that often moves to right and the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right successively;
The numerical value corresponding according to each the 1 bit secondary code sequence that often moves to right obtained and the relevant accumulated value of the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right, calculate the product accumulation of the secondary code of each 1 bit that often moves to right; The length of the bit of described secondary code sequence until moved to right;
Often move to right according to each calculating the product accumulation of secondary code of 1 bit, obtained the code phase of the secondary code time of reception by Discr..
Further, moment determining unit, specifically for:
Identify the product accumulation of secondary code maximum in the product accumulation of the secondary code of each 1 bit that often moves to right;
The index value that the product accumulation of maximum secondary code is corresponding is the code phase of the secondary code time of reception.
Module is set, for the code phase of the secondary determined code time of reception being set to the initial code phase positions of secondary code.
Alignment module, for the code phase according to the initial code phase positions alignment secondary code time of reception of the secondary code arranged and the secondary code of local generation.
Strip module, the secondary code for being produced this locality after alignment does product with corresponding satellite-signal and calculates, to peel off secondary code.
The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as ROM (read-only memory), disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The application is not restricted to the combination of the hardware and software of any particular form.
The above, be only preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. realize the method that receiver secondary code is peeled off, it is characterized in that, comprising:
Determine the code phase of the secondary code time of reception;
The code phase of the secondary code time of reception determined is set to the initial code phase positions of secondary code;
According to the initial code phase positions alignment secondary code time of reception of the secondary code arranged and the code phase of the local secondary code produced;
The secondary code that this locality after alignment produces is done product with corresponding satellite-signal calculate, to peel off secondary code.
2. method according to claim 1, is characterized in that, describedly determines that the code phase of secondary code time of reception comprises:
Obtain the secondary code sequence of the described secondary code time of reception;
The length of the bit of described secondary code sequence is determined according to the secondary code sequence obtained;
According to the length of the secondary code sequence obtained with the bit of the described secondary code sequence determined, determine the code phase of the secondary code time of reception.
3. method according to claim 2, is characterized in that, the described secondary code sequence according to obtaining and the length of the bit of the secondary code sequence determined, determines the code phase of the secondary code time of reception, comprising:
The secondary code sequence loops of secondary code time of reception of described acquisition is moved to right 1 bit secondary code sequence;
Obtain the relevant accumulated value of the corresponding numerical value of each 1 bit secondary code sequence that often moves to right and the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right successively;
The numerical value corresponding according to each the 1 bit secondary code sequence that often moves to right obtained and the relevant accumulated value of the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right, calculate the product accumulation of the secondary code of each 1 bit that often moves to right; The length of the bit of described secondary code sequence until moved to right;
Often move to right according to each calculating the product accumulation of secondary code of 1 bit, obtained the code phase of the secondary code time of reception by Discr..
4. method according to claim 3, is characterized in that, the described code phase being obtained the secondary code time of reception by Discr., being comprised:
Identify the product accumulation of secondary code maximum in the product accumulation of the secondary code of each 1 bit that often moves to right;
The index value that the product accumulation of maximum secondary code is corresponding is the code phase of the secondary code time of reception.
5. realize the device that receiver secondary code is peeled off, it is characterized in that, comprising: determination module, module, alignment module and strip module are set; Wherein,
Determination module, for determining the code phase of the secondary code time of reception;
Module is set, for the code phase of the secondary determined code time of reception being set to the initial code phase positions of secondary code;
Alignment module, for the code phase according to the initial code phase positions alignment secondary code time of reception of the secondary code arranged and the secondary code of local generation;
Strip module, the secondary code for being produced this locality after alignment does product with corresponding satellite-signal and calculates, to peel off secondary code.
6. device according to claim 5, is characterized in that, described determination module comprises acquiring unit, length determination unit and moment determining unit;
Acquiring unit, for obtaining the secondary code sequence of the described secondary code time of reception;
Length determination unit, for determining the length of the bit of described secondary code sequence according to the secondary code sequence obtained;
Moment determining unit, for the length of the bit according to the secondary code sequence obtained and the described secondary code sequence determined, determines the code phase of the secondary code time of reception.
7. device according to claim 6, is characterized in that, described moment determination module, specifically for:
The secondary code sequence loops of secondary code time of reception of described acquisition is moved to right 1 bit secondary code sequence;
Obtain the relevant accumulated value of the corresponding numerical value of each 1 bit secondary code sequence that often moves to right and the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right successively;
The numerical value corresponding according to each the 1 bit secondary code sequence that often moves to right obtained and the relevant accumulated value of the satellite-signal corresponding to this 1 bit secondary code sequence that often moves to right, calculate the product accumulation of the secondary code of each 1 bit that often moves to right; The length of the bit of described secondary code sequence until moved to right;
Often move to right according to each calculating the product accumulation of secondary code of 1 bit, obtained the code phase of the secondary code time of reception by Discr..
8. device according to claim 7, is characterized in that, described moment determining unit, specifically for:
Identify the product accumulation of secondary code maximum in the product accumulation of the secondary code of each 1 bit that often moves to right;
The index value that the product accumulation of maximum secondary code is corresponding is the code phase of the secondary code time of reception.
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| CN201510188828.9A CN104777496A (en) | 2015-04-20 | 2015-04-20 | Method and device capable of peeling second-level code of receiver |
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| CN201510188828.9A CN104777496A (en) | 2015-04-20 | 2015-04-20 | Method and device capable of peeling second-level code of receiver |
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| US5642377A (en) * | 1995-07-25 | 1997-06-24 | Nokia Mobile Phones, Ltd. | Serial search acquisition system with adaptive threshold and optimal decision for spread spectrum systems |
| CN103645483A (en) * | 2013-12-09 | 2014-03-19 | 西安电子科技大学昆山创新研究院 | Beidou signal capturing method in weak signal environment |
| CN104483684A (en) * | 2015-01-05 | 2015-04-01 | 中国科学院重庆绿色智能技术研究院 | Method for rapidly capturing weak signals of Beidou D1 satellite navigation system |
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Application publication date: 20150715 |