CN106291613A - A kind of satellite signal tracking method and device - Google Patents
A kind of satellite signal tracking method and device Download PDFInfo
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- CN106291613A CN106291613A CN201610630217.XA CN201610630217A CN106291613A CN 106291613 A CN106291613 A CN 106291613A CN 201610630217 A CN201610630217 A CN 201610630217A CN 106291613 A CN106291613 A CN 106291613A
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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
-
- 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
- G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
-
- 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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- Engineering & Computer Science (AREA)
- 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 kind of satellite signal tracking method and device, use parallel and frequency parallel the searching method of code to realize quick captured in real time；It is applicable to army's code and people's code of same code check；Sensitivity is improved in the case of not increasing resource；Whole processing procedure can realize in FPGA, beneficially the Miniaturization Design of receiver；The inventive method is applicable to the receiver terminal of the multiple satellite navigation system such as the Big Dipper, GPS, has stronger practicality.
Description
Technical field
The application relates to communication technical field, particularly relates to a kind of satellite signal tracking method and device.
Background technology
The main task of receiver is to receive the signal of satellite launch, and processes, and obtains navigation message and observed quantity.
These tasks are wanted, it is necessary first to carry out is the capture of satellite-signal.Capturing navigation satellite signal is the docking collection of letters number
Carrier frequency and a two-dimensional search process of pseudo-code phase, when local reference sequences reaches the most synchronize and frequently with satellite-signal
During rate also approximately equal, correlation peak can be produced, judge whether according to this to complete capture.
The sensitivity of capture and the speed of speed directly determine receiver and can capture how strong signal and adapt to much
Dynamic, it is possible in real time satellite-signal is carried out capture and can quickly proceed to tracking phase, to ensure that receiver is adapted to
Higher is dynamic.
But, current receiver is relatively slow to the acquisition speed of satellite-signal, and efficiency is relatively low.
Summary of the invention
Embodiments provide a kind of satellite signal tracking method and device, in order to solve receiver in prior art
Relatively slow to the acquisition speed of satellite-signal, and the problem that efficiency is relatively low.
Its concrete technical scheme is as follows:
A kind of satellite signal tracking method, described method includes:
Obtain satellite-signal, and described satellite-signal is carried out signal processing, obtain the intermediate frequency that described satellite-signal is corresponding
Digital signal；
Going carrier down-conversion down-sampled described digital intermediate frequency signal, every 2L point signal stores, and carries out 2L
The FFT of point, the frequency-domain result after store transformed, altogether M frequency-region signal memory element is wherein, and L is the most whole more than or equal to 1
Number；
The local pseudo-code of L point length is stored, and expands to 2L point, carry out the FFT of 2L point, after store transformed
Frequency-domain result, altogether M frequency-region signal memory element.
Satellite frequency-region signal in corresponding memory element is carried out CM with local pseudo-code frequency domain expansion signal, and passes through
M inversefouriertransform IFFT module processes, and is sequentially output the time-domain signal after IFFT；
By Fourier transformation FFT module, the described M simultaneously exported some time-domain signal is carried out Fourier transformation, and obtain
Parallel doppler Search Results under one code phase；
Described doppler searching result is carried out peakvalue's checking, obtains maximum of points, and record the code phase of maximum of points
And doppler values；
Code phase and doppler values are verified, determines whether satellite signal acquisition completes.
Preferably, CM is carried out at the 2L this locality pseudo-code frequency domain expansion signal that will get and 2L point base band satellite-signal
Before, described method also includes:
Pseudo-code local to the L point collected stores；
Pseudo-code local to each L point is applied for another extension, obtains 2L point this locality pseudo-code；
Pseudo-code local to described 2L point carries out FFT to frequency domain, obtains 2L this locality pseudo-code frequency domain expansion signal.
By local for L point pseudo-code frequency domain expansion signal storage, total M memory element, M section L point signal can be stored.
Preferably, CM is carried out at the 2L this locality pseudo-code frequency domain expansion signal that will get and 2L point base band satellite-signal
Before, described method also includes:
In real time 2L point base band satellite-signal is stored, update L point satellite-signal every time；
2L point base band satellite-signal is carried out FFT to frequency domain, obtain 2L point satellite frequency-region signal.
2L point satellite frequency domain expansion signal is stored, total M memory element, M section 2L point signal can be stored.
Preferably, described doppler searching result is carried out peakvalue's checking, including:
To doppler searching result delivery value, and modulus value is stored, be stored as L*N data；
L*N data of storage are detected.
Preferably, code phase and doppler values are verified, determine that satellite signal acquisition is the most correct, particularly as follows:
Detect this code phase and whether capture result again corresponding to doppler values remains as maximum；
If, it is determined that satellite signal acquisition completes；
If not, it is determined that satellite signal acquisition failure.
A kind of satellite signal acquisition device, including:
Acquisition module, is used for obtaining satellite-signal, and described satellite-signal is carried out signal processing, obtains described satellite letter
Number corresponding digital intermediate frequency signal；
Down-converted module, for going carrier down-conversion down-sampled described digital intermediate frequency signal；
CM and IFFT module, for the local pseudo-code frequency domain expansion of 2L point satellite frequency-region signal and 2L point that will get
Signal carries out CM, and is processed by M inversefouriertransform IFFT module, is sequentially output the result after conversion；
Fourier transformation module, for the M point time-domain signal exported is carried out Fourier transformation simultaneously, and obtains a code
Parallel doppler Search Results under phase place；
Detection module, for described doppler searching result carries out peakvalue's checking, obtains maximum of points, and records maximum
The code phase of value point and doppler values；
Determine module, use catch code phase place and doppler values again to capture, whether capture result by detection
It is still peak-peak, determines whether satellite signal acquisition completes.
Preferably, also include:
Store for pseudo-code local to the L point collected；Pseudo-code local to each L point carries out zero padding extension,
To the local pseudo-code of 2L point；Pseudo-code local to described 2L point carries out FFT to frequency domain, obtains 2L this locality pseudo-code frequency domain expansion letter
Number, because of its symmetry, the L point frequency-region signal in memorizer.
Preferably, described down-converted module, it is additionally operable in real time 2L point base band satellite-signal be stored；The most more
New L point satellite-signal, carries out FFT value frequency domain by 2L point base band satellite-signal, obtains 2L point satellite frequency-region signal, and carry out
Storage.
Preferably, described detection module, specifically for doppler searching result delivery value, and modulus value is stored,
It is stored as L*N data；L*N data of storage are carried out maximum detection.
Preferably, described determine module, use code phase and doppler values again to capture, the capture that detection is corresponding
Whether result remains as maximum；If, it is determined that satellite signal acquisition completes；If not, it is determined that satellite signal acquisition failure.
Embodiments providing a kind of satellite signal tracking method, the method includes: obtain satellite-signal, and to defending
Star signal carries out signal processing, obtains the digital intermediate frequency signal that satellite-signal is corresponding, unloads described digital intermediate frequency signal
Ripple down coversion is down-sampled, obtains 2L point base band satellite-signal, by the 2L this locality pseudo-code frequency domain expansion signal got with carry out multiple
Number is taken advantage of, and is processed by M anti-Fourier's IFFT module, obtains M point time-domain signal, by Fourier transformation FFT module
M point time-domain signal is carried out Fourier transformation, and obtains the parallel doppler Search Results under a code phase；Doppler is searched
Hitch fruit carries out peakvalue's checking, obtains maximum of points, and records code phase and the doppler values of maximum of points；According to code-phase
Position and the result of doppler values verifying satellites signal, determine whether satellite signal acquisition completes.In the present invention, use
Parallel and frequency parallel all methods of code carry out satellite signal acquisition, it is achieved that the effect of fast Acquisition, and are not increasing
In the case of adding resource, improve the acquisition sensitivity of satellite-signal.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of satellite signal tracking method in the embodiment of the present invention；
Fig. 2 is the block process schematic diagram of embodiment of the present invention Satellite signal capture；
Fig. 3 is that digital intermediate frequency signal goes in the embodiment of the present invention carrier down-conversion down-sampled process schematic diagram；
Fig. 4 is base band satellite-signal storage reading manner schematic diagram in the embodiment of the present invention；
Fig. 5 is the data storage method schematic diagram of local pseudo-code in the embodiment of the present invention；
Fig. 6 is that in the embodiment of the present invention, the non-coherent integration mode of adding up calculates schematic diagram；
Fig. 7 is the structural representation of a kind of satellite signal acquisition device in the embodiment of the present invention.
Detailed description of the invention
Embodiments providing a kind of satellite signal tracking method, the method includes: obtain satellite-signal, and to defending
Star signal carries out signal processing, obtains the digital intermediate frequency signal that satellite-signal is corresponding, unloads described digital intermediate frequency signal
Ripple down coversion is down-sampled, obtains 2L point base band satellite-signal, by the 2L this locality pseudo-code frequency domain expansion signal got with carry out multiple
Number is taken advantage of, and is processed by M anti-Fourier's IFFT module, obtains M point time-domain signal, by Fourier transformation FFT module
M point time-domain signal is carried out Fourier transformation, and obtains the parallel doppler Search Results under a code phase；Doppler is searched
Hitch fruit carries out peakvalue's checking, obtains maximum of points, and records code phase and the doppler values of maximum of points；According to code-phase
Position and the result of doppler values verifying satellites signal, determine whether satellite signal acquisition completes.In the present invention, use
Parallel and frequency parallel all methods of code carry out satellite signal acquisition, it is achieved that the effect of fast Acquisition, and are not increasing
In the case of adding resource, improve the acquisition sensitivity of satellite-signal.
Below by accompanying drawing and specific embodiment, technical solution of the present invention is described in detail, it will be appreciated that this
Concrete technical characteristic in bright embodiment and embodiment is the explanation to technical solution of the present invention rather than restriction, not
In the case of conflict, the concrete technical characteristic in the embodiment of the present invention and embodiment can be mutually combined.
Being illustrated in figure 1 the flow chart of a kind of satellite signal tracking method in the embodiment of the present invention, the method includes:
S101, obtains satellite-signal, and described satellite-signal carries out the down-sampled process of down coversion, obtains described satellite letter
Number baseband digital signal；
S102, carries out FFT to 2L point base band satellite-signal, the frequency domain satellite-signal after store transformed, and coexist storage M
Section；The local pseudo-code of L point length being expanded to 2L point, carries out FFT, the frequency domain pseudo-code signal after store transformed, coexist storage M
Section；
Here L is the positive integer more than or equal to 1；Here M is the positive integer more than or equal to 1；
S103, carries out corresponding plural number by local to M group 2L point satellite frequency-region signal and M group 2L point pseudo-code frequency domain expansion signal
Take advantage of, and processed by M IFFT conversion module, be sequentially output the time-domain signal after IFFT；
S104, carries out the Fourier of N point by Fourier transformation FFT module to the described M exported some time-domain signal simultaneously
Conversion, and obtain the parallel doppler Search Results under a code phase, and result is stored；
S105, carries out peakvalue's checking to doppler searching result, obtains maximum of points, and records the code phase of maximum of points
And doppler values；
S106, uses above-mentioned code phase and doppler values again to capture, by detection capture result the most still
For maximum, determine that satellite signal acquisition is the most correct.
Specifically, be illustrated in figure 2 the block process schematic diagram of satellite signal acquisition, get satellite-signal it
After, first the satellite-signal received is downconverted to intermediate frequency and goes forward side by side row number sample quantization, obtain digital intermediate frequency signal.
Then digital intermediate frequency signal goes carrier wave downconvert to base band, and carries out down-sampled process, down-sampled after sample rate with
Base band satellite-signal bandwidth is similar.Here digital intermediate frequency signal is gone the down-sampled process of carrier down-conversion as it is shown on figure 3, scheming
In 3, digital intermediate frequency signal is carried out the down-sampled process of down coversion.
In real time 2L point base band satellite-signal is stored；Update L point base band satellite-signal, by 2L point base band satellite every time
Signal carries out FFT to frequency domain, obtains 2L point satellite frequency-region signal.
Specifically, it is illustrated in figure 4 base band satellite-signal storage reading manner, by the number in coherent integration time Tcoh
According to being divided into M section, every section of L point, store adjacent 2L point data, and constantly reading old value is stored in new value.By complete adjacent two sections
2L point data carries out FFT calculating, and frequency domain 2L point data is stored, and needs M memory element altogether.Thus obtain 2L point to defend
Star frequency-region signal.
Further, it is illustrated in figure 5 the data storage method of local pseudo-code, specifically, selects Tcoh time span
Local pseudo-code is divided into M section, every section of L point, stores L point data, and constantly reading old value is stored in new value, the L point data read mended
Null value 2L point to FFT module, and satellite-signal time-sharing multiplex FFT module, and frequency domain data being stored, in view of pseudo-code zero padding FFT
Frequency-region signal afterwards has symmetry, so only needing to store L point can obtain full detail, needs M memory element altogether.
Assume that the process of capture needs to carry out L*M point coherent integration, when capture starts, local for L point pseudo-code is deposited
Storage, and constantly update, applying for another each L point data extends to 2L point, is converted into frequency domain, L before storage by FFT module
Point frequency domain data, needs M block to store altogether；
Getting 2L this locality pseudo-code frequency domain expansion signal and 2L point frequency domain satellite-signal carries out corresponding CM, and will
Taking advantage of result to be input to M IFFT module again, through IFFT resume module, M IFFT module calculates and output time-domain signal simultaneously,
Output M point time-domain signal the most simultaneously.
The M simultaneously exported some time-domain signal is exported toPoint FFT processing module, exports under a code phase
Parallel doppler Search Results；As shown in Figure 6, in figure 6, M result under same phase place exports this calculating process simultaneously
To FFT module, carry out parallel frequency search, this FFT module count forSuch as when M is 20, points N
It is 32.
It is calculated the frequency search result under same code phase, by result delivery value and store, each phase place by FFT
Storage N point modulus value, the modulus value L × N point of L the phase place of storage that coexist.
Multiple is there is poor, FFT module and IFFT module between signal rate and processing unit processes speed after down-sampled
Time-sharing multiplex can be carried out, increasing processing unit without extra and in the case of the process used time, improving acquisition sensitivity, adjacent
The parallel frequency search result delivery result of Tcoh timing code phase place realizes non-coherent integration by the way of as shown in Figure 7.
Often newly entering L point satellite-signal and repeat above step, contrast the L*N point modulus value of storage every time, record is maximum
Value and code phase corresponding to maximum and Doppler.Searching after complete all of code phase, determine maximum and correspondence
Code phase and Doppler, complete capture.
The Doppler obtained and code phase is used again to capture checking, if still acquisition success being described for maximum of points,
Can proceed to follow the tracks of.
The method that the embodiment of the present invention is provided, uses parallel and frequency parallel the searching method of code to capture, it is achieved
Quickly captured in real time；It is applicable to army's code and people's code of same code check；Sensitivity is improved in the case of not increasing resource；Whole
Process can realize in FPGA, beneficially the Miniaturization Design of receiver；The inventive method is applicable to that the Big Dipper, GPS etc. are multiple to be defended
The receiver terminal of star navigation system, has stronger practicality.
A kind of satellite signal tracking method in the corresponding embodiment of the present invention, additionally provides a kind of satellite in the embodiment of the present invention
Signal capture device, is illustrated in figure 7 the structural representation of a kind of satellite signal acquisition device, this device in the embodiment of the present invention
Including:
Signal pre-processing module (acquisition module) 701, obtains satellite-signal, and described satellite-signal is carried out down coversion fall
Sampling processing, obtains the baseband digital signal of described satellite-signal；
FFT and memory module (down-converted module) 702, carry out FFT to 2L point base band satellite-signal, deposit
Frequency domain satellite-signal after storage conversion, coexist storage M section；The local pseudo-code of L point length is expanded to 2L point, carries out FFT, deposit
Frequency domain pseudo-code signal after storage conversion, coexist storage M section；
CM and IFFT module 703, by local to M group 2L point satellite frequency-region signal and M group 2L point pseudo-code frequency domain expansion letter
Number carry out corresponding CM, and processed by M IFFT conversion module, be sequentially output the time-domain signal after IFFT；；
FFT and memory module (Fourier transformation module) 704, for the described M exported some time-domain signal simultaneously
Carry out the Fourier transformation of N point, and obtain the parallel doppler Search Results under a code phase, and result is stored；
Detection module 705, for doppler searching result carries out peakvalue's checking, obtains maximum of points, and records maximum
The code phase of value point and doppler values；
Determine module 706, for verifying the correctness of capture result, use above-mentioned code phase and doppler values to carry out again
Whether secondary capture, remain as maximum by detection capture result, determine that satellite signal acquisition is the most correct.
Further, in embodiments of the present invention, this device also includes:
Processing module, stores for pseudo-code local to L point；Pseudo-code local to each L point is applied for another extension, must
To the local pseudo-code of 2L point；Pseudo-code local to described 2L point carries out FFT to frequency domain, obtains 2L this locality pseudo-code frequency domain expansion letter
Number.
Further, in embodiments of the present invention, described processing module, it is additionally operable in real time 2L point base band satellite-signal be carried out
Storage；Update the L basic satellite-signal of point every time, 2L point base band satellite-signal is carried out FFT value frequency domain, obtains 2L point satellite
Frequency-region signal.
Further, in embodiments of the present invention, described detection module 705, specifically for doppler searching result delivery
Value, and modulus value is stored, it is stored as L*N data；L*N data of storage are detected.
Further, in embodiments of the present invention, described module 706 is determined, specifically for detection code phase and Doppler
When again capturing, whether its capture result remains as maximum；If, it is determined that satellite signal acquisition completes；If it is not, it is the most true
Determine satellite signal acquisition failure.
Although having been described for the preferred embodiment of the application, but one of ordinary skilled in the art once knowing substantially
Creative concept, then can make other change and amendment to these embodiments.So, claims are intended to be construed to bag
Include preferred embodiment and fall into all changes and the amendment of the application scope.
Obviously, those skilled in the art can carry out various change and the modification essence without deviating from the application to the application
God and scope.So, if these amendments of the application and modification belong to the scope of the application claim and equivalent technologies thereof
Within, then the application is also intended to comprise these change and modification.
Claims (10)
1. a satellite signal tracking method, it is characterised in that described method includes:
Obtain satellite-signal, and described satellite-signal is carried out signal processing, obtain the intermediate frequency digital that described satellite-signal is corresponding
Signal；
Going carrier down-conversion down-sampled described digital intermediate frequency signal, every 2L point signal stores, and carries out 2L point
FFT, the frequency-domain result after store transformed, M frequency-region signal memory element is wherein altogether, and L is the positive integer more than or equal to 1；
The local pseudo-code of L point length is stored, and expands to 2L point, carry out the FFT of 2L point, the frequency after store transformed
Field result, altogether M frequency-region signal memory element.
Satellite frequency-region signal in corresponding memory element and local pseudo-code frequency domain expansion signal are carried out CM, and by M
Inversefouriertransform IFFT module processes, and is sequentially output the time-domain signal after IFFT；
By Fourier transformation FFT module, the described M simultaneously exported some time-domain signal is carried out Fourier transformation, and obtain one
Parallel doppler Search Results under code phase；
Described doppler searching result is carried out peakvalue's checking, obtains maximum of points, and record maximum of points code phase and
Doppler values；
Code phase and doppler values are verified, determines whether satellite signal acquisition completes.
2. the method for claim 1, it is characterised in that at the 2L this locality pseudo-code frequency domain expansion signal that will get and 2L
Before some base band satellite-signal carries out CM, described method also includes:
Pseudo-code local to the L point collected stores；
Pseudo-code local to each L point is applied for another extension, obtains 2L point this locality pseudo-code；
Pseudo-code local to described 2L point carries out FFT to frequency domain, obtains 2L this locality pseudo-code frequency domain expansion signal.
By local for L point pseudo-code frequency domain expansion signal storage, total M memory element, M section L point signal can be stored.
3. the method for claim 1, it is characterised in that at the 2L this locality pseudo-code frequency domain expansion signal that will get and 2L
Before some base band satellite-signal carries out CM, described method also includes:
In real time 2L point base band satellite-signal is stored, update L point satellite-signal every time；
2L point base band satellite-signal is carried out FFT to frequency domain, obtain 2L point satellite frequency-region signal.
2L point satellite frequency domain expansion signal is stored, total M memory element, M section 2L point signal can be stored.
4. the method for claim 1, it is characterised in that described doppler searching result is carried out peakvalue's checking, including:
To doppler searching result delivery value, and modulus value is stored, be stored as L*N data；
L*N data of storage are detected.
5. the method for claim 1, it is characterised in that code phase and doppler values are verified, determines satellite
Signal capture is the most correct, particularly as follows:
Detect this code phase and whether capture result again corresponding to doppler values remains as maximum；
If, it is determined that satellite signal acquisition completes；
If not, it is determined that satellite signal acquisition failure.
6. a satellite signal acquisition device, it is characterised in that including:
Acquisition module, is used for obtaining satellite-signal, and described satellite-signal is carried out signal processing, obtain described satellite-signal pair
The digital intermediate frequency signal answered；
Down-converted module, for going carrier down-conversion down-sampled described digital intermediate frequency signal；
CM and IFFT module, for the local pseudo-code frequency domain expansion signal of 2L point satellite frequency-region signal and 2L point that will get
Carry out CM, and processed by M inversefouriertransform IFFT module, be sequentially output the result after conversion；
Fourier transformation module, for the M point time-domain signal exported is carried out Fourier transformation simultaneously, and obtains a code phase
Under parallel doppler Search Results；
Detection module, for described doppler searching result carries out peakvalue's checking, obtains maximum of points, and records maximum of points
Code phase and doppler values；
Determine module, use catch code phase place and doppler values again to capture, by detection capture result be the most still
Peak-peak, determines whether satellite signal acquisition completes.
7. device as claimed in claim 6, it is characterised in that also include:
Store for pseudo-code local to the L point collected；Pseudo-code local to each L point carries out zero padding extension, obtains 2L
The local pseudo-code of point；Pseudo-code local to described 2L point carries out FFT to frequency domain, obtains 2L this locality pseudo-code frequency domain expansion signal, because of
Its symmetry, the L point frequency-region signal in memorizer.
8. device as claimed in claim 7, it is characterised in that described down-converted module, is additionally operable in real time 2L point base
Band satellite-signal stores；Update L point satellite-signal every time, 2L point base band satellite-signal is carried out FFT value frequency domain,
To 2L point satellite frequency-region signal, and store.
9. device as claimed in claim 6, it is characterised in that described detection module, specifically for doppler searching result
Delivery value, and modulus value is stored, it is stored as L*N data；L*N data of storage are carried out maximum detection.
10. device as claimed in claim 6, it is characterised in that described determine module, uses code phase and doppler values to enter
Row captures again, and whether the capture result of detection correspondence remains as maximum；If, it is determined that satellite signal acquisition completes；If
No, it is determined that satellite signal acquisition failure.
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| CN109143285A (en) * | 2017-06-27 | 2019-01-04 | 航天恒星科技有限公司 | Positioning reporting chain applied to the changeable high dynamic target of posture |
| CN110346820A (en) * | 2019-05-07 | 2019-10-18 | 和芯星通科技(北京)有限公司 | The dispatching method and device of resource in Global Navigation Satellite System |
| CN111257913A (en) * | 2019-11-29 | 2020-06-09 | 交通运输部长江通信管理局 | Beidou satellite signal capturing method and device |
| CN111399004A (en) * | 2020-04-07 | 2020-07-10 | 北京理工大学 | High-dynamic high-sensitivity GNSS signal capturing method |
| WO2020253056A1 (en) * | 2019-06-18 | 2020-12-24 | 山东大学 | Gnss signal acquisition method employing fpga step-by-step code phase refinement |
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