CN107346028A - A kind of method and device for realizing code phase search - Google Patents
A kind of method and device for realizing code phase search Download PDFInfo
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- CN107346028A CN107346028A CN201610299449.1A CN201610299449A CN107346028A CN 107346028 A CN107346028 A CN 107346028A CN 201610299449 A CN201610299449 A CN 201610299449A CN 107346028 A CN107346028 A CN 107346028A
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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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Abstract
A kind of method and device for realizing code phase search, including：Merge with phase and orthogonal mixing results generation complex signal；Down-sampling complex signal obtains the first down-sampled signal；By slightly capturing (C/A) code and the local conjugation result of part C/A codes generation first and second entirely；It will be multiplied after first down-sampled signal progress Fourier transformation the first transformation results of acquisition with the first local conjugation result by multiplier, and carry out Fourier inversion, modulus and phase judgement the first court verdict of acquisition；The sample point of Fourier transformation is obtained by the first court verdict, and complex signal is carried out to be multiplied by multiplier with the second local conjugation result after Fourier transformation obtains the second transformation results, and carry out Fourier inversion, modulus, phase judgement the second court verdict of acquisition is carried out with reference to the first court verdict, code phase is obtained with this.The embodiment of the present invention obtains code phase by doing the processing such as down-sampling to complex signal, realizes the guarantee of code phase search precision and the reduction of complexity.
Description
Technical field
The present invention relates to signal processing technology, espespecially a kind of method and device for realizing code phase search.
Background technology
GPS (GNSS, Global Navigation Satellite System) is in people
Daily life in play more and more irreplaceable important function, especially navigation, timing, mapping
More and more applied Deng field.At present, GPS mainly includes the whole world in the U.S.
Alignment system (GPS), the Big Dipper (BD) system of China, the global navigational satellite positioning system of Russia
Unite (GLONASS, GLObal NAvigation Satellite System), and the Galileo in Europe
(Galileo) system.In China and the Asian-Pacific area, GPS and dipper system are using relatively broad；And
Russia, with GPS and GLONASS using more.Because Galileo system is ripe far away, still can not
Formal service is provided.Positioned using GPS, timing etc. business when, it is necessary first to
The wireless signal of at least four visible satellites is captured, realizes that three-dimensional search is calculated by the wireless signal of capture
Method, three-dimensional search algorithm include：Satellite pseudo-code, code phase and Doppler frequency shift；Wherein, code phase
Precision directly affects operation related to code phase in positions calculations circuit, directly affects positions calculations
Precision；By taking gps signal as an example, each thick capture (C/A, Coarse Acquisition) code totally 1023
Individual chip, time span 1ms；Time span by calculating each chip is 1 millisecond (ms)
/ 1023=977.5 nanoseconds (ns), if 1% deviation, i.e. 9.775ns occurs in the time span of chip
Deviation, then the position error caused by the time span deviation of chip is 3*108(meter per second) * 9.775
Ns=2.93 rice, i.e., due to time span deviation existing for chip, cause serious position error.
Common linear search method takes oversize according to one-dimensional, two-dimentional, three-dimensional order search one by one.
In order to less time-consuming, parallel search method is developed, such as, parallel code phase search algorithm, can
The used time is obviously reduced.Fig. 1 is the code phase search circuit theory diagrams in correlation technique, as shown in figure 1,
When digital intermediate frequency input signal is answered with first band on same phase (I) branch road and orthogonal (Q) branch road respectively
After the sinusoidal signal mixing with duplication cosine carrier of system, to pass through with the plural form mutually with orthogonal mixing results
First Fourier transform unit carries out Fourier transformation and obtains Fourier transformation result；By Fourier transformation knot
Fruit and the local code conjugation result of local code sequence units generation (replicate thick capture (C/A) code generator
Caused local code, the local code of duplication is fourier transformed module and complex conjugate block processing obtains
Local code is conjugated result) it is multiplied by multiplier, the product obtained will be multiplied through Fourier by multiplier
Inverse transformation unit carries out processing and obtains the correlated results in time domain, by the correlated results in the time domain of acquisition
Detection judges that parallel code phase signal whether there is after carrying out modulus by modulus unit.Completing to working as
After the search and detection of preceding frequency band, receiver then allows carrier wave digital controlled oscillator (NCO, Numerical
Control Oscillator) second band sinusoidal carrier and cosine carrier duplication are carried out, then it is accomplished analogously
Search and detection to other frequency bands, here, the numerical value of first band, second band and other frequency bands
It is the common knowledge of those skilled in the art for the traversal frequency band used during parallel code phase search.
In search procedure in same satellite-signal different frequency bands, replicating the phase of C/A codes can keep not
Become, correspondingly its Fourier transformation and its conjugate also keep constant.When searching for another satellite-signal,
Receiver can allow C/A code generators to replicate another corresponding C/A code, then repeat above-mentioned in each frequency
Signal search process in band.
Parallel code phase search algorithm is actually replaced using this Digital Signal Processing of Fourier transformation
For the related operation of digital correlator, both equivalences are will be proven below.Remember that two length are N points
Periodic sequence is x (n) and y (n), and its sequence of correlation values is z (n), wherein, n=0,1 ...,
N-1, it is represented by formula (1)：
Discrete Fourier transform is carried out to above-mentioned sequence of correlation values z (n), obtains z (n) direct computation of DFT
Leaf transformation D (k) is such as shown in formula (2)：
The sequence of correlation values z (n) of formula (1) is substituted into the z (n) of formula (2) discrete fourier
Formula (3) is obtained in conversion Z (k)：
Formula (3) can transform to formula (4)：
Formula (4), which can simplify, is expressed as formula (5)：
Wherein, X (k) and Y (k) is respectively x (n) and y (n) discrete Fourier transform,
Represent the conjugation of plural Y (k).Above formula shows：Two sequence x (n) and y (n) are done in time domain
Related operation, discrete Fourier transform X (k) and Y (k) equivalent to them (are Specifically Y
(k) conjugation) product calculation is done in frequency domain.Then turn around, productIt is discrete
Fourier inversion is exactly the correlation z (n) at each code phase that receiver needs to be detected.
Once correlation z (n) is calculated by Fourier inversion in receiver, then ensuing signal inspection
Survey is the same with regard to collinearity code acquisition method, that is, finds out the auto-correlation amplitude in all search units | z (n) |
Peak value, and the peak value is compared with detection threshold value.If peak value exceedes detection threshold value, receive
Machine has captured signal, and also therefrom obtains two parameter values of frequency and code phase of the signal.Need
It is noted that for GPS navigation system, y (n) sequences in the above-mentioned process of argumentation can be with
It is local code sequence caused by C/A code generators, and the sequence length of local code sequence is N=1023
Chip, time span 1ms.
If obtaining high-resolution code phase search result using above-mentioned parallel code phase search algorithm,
The Fourier transform operation of large-size is necessarily required to, and large-sized Fourier transform operation needs are larger
Complexity, cause code phase search difficult.
The content of the invention
In order to solve the above-mentioned technical problem, the present invention provides a kind of method and device for realizing code phase search,
The resolution ratio of search code phase can be improved, finer code phase search knot is obtained with relatively low complexity
Fruit.
In order to reach the object of the invention, the invention provides a kind of device for realizing code phase search, and it is special
Sign is, including：Synthesis unit, tie point and the second branch road；Wherein,
Synthesis unit is used for, and the same phase mixing results of code phase search circuit and orthogonal mixing results are merged
Complex signal is generated, and is sent to tie point and the second branch road；
Tie point includes：First sampling unit, the first local code sequence units, first module and first
Decision unit；Wherein,
First sampling unit is used for, and the down-sampling acquisition first of the first multiple is carried out to the complex signal of reception
Down-sampled signal；
First local code sequence units are used for, using the full C/A codes as caused by slightly capturing C/A code generators
The local conjugation result of the first of generation；
First module is used for, and the first transformation results are obtained after the first down-sampled signal is carried out into Fourier transformation,
The first local conjugation result that first transformation results and the first local code sequence units are generated passes through multiplier
After multiplication, Fourier inversion and modulus processing are carried out, obtains the first modulus result；
First decision unit is used for, and phase judgement is carried out to the first modulus result and obtains the first court verdict；
Second branch road includes：Second local code sequence units, second unit and the second decision unit；Wherein,
Second local code sequence units are used for, and are generated using the part C/A codes as caused by C/A code generators
Second local conjugation result；
Second unit is used for, and the first court verdict obtained according to tie point, which obtains, to be believed the plural number of reception
Number carry out Fourier transformation sample point；Plural number is believed according to the sample point of the carry out Fourier transformation of acquisition
Number carry out Fourier transformation after obtain the second transformation results, by the second transformation results and the second local code sequence
After second local conjugation result of unit generation is multiplied by multiplier, Fourier inversion and modulus are carried out
Processing, obtain the second modulus result；
Second decision unit is used for, and carries out phase judgement to the second modulus result with reference to the first court verdict and obtains
The second court verdict is obtained, and code phase is obtained according to the second court verdict.
Optionally, the second decision unit is specifically used for,
With reference to the first court verdict from the first decision unit to the second modulus result carry out phase judgement with
The second court verdict is obtained, and code phase is directly obtained from the second court verdict.
Optionally, second branch road also includes the second sampling unit, for entering to the complex signal of reception
The down-sampling of the multiple of row second obtains the second down-sampled signal；
Second multiple is less than first multiple.
Optionally, the sample point for carrying out Fourier transformation includes the first court verdict, the first judgement knot
Default sample point near fruit.
Optionally, the device also includes one or more optional branch roads；
Second decision unit is specifically used for, according to first court verdict of reception to described second
Modulus result carries out phase judgement to obtain the second court verdict, and second court verdict of acquisition is made
Optional branch road is sent to for interlocutory judgment result；
The synthesis unit is additionally operable to, and the complex signal for merging generation is sent into each optional branch road；
Each optional branch road includes corresponding respectively：Optional sampling unit, optional local code sequence units,
Selectable unit and optional decision unit；Wherein,
Optional sampling unit is used for, and the down-sampling acquisition to the optional multiple of complex signal progress of reception is optional
Down-sampled signal；
Optional local code sequence units are used for, using the optional part C/A codes as caused by C/A code generators
The optional local conjugation result of generation；
Selectable unit is used for, and optional transformation results are obtained after optional down-sampled signal is carried out into Fourier transformation,
The optional local conjugation result that optional transformation results and optional local code sequence units are generated passes through multiplier
After multiplication, Fourier inversion and modulus processing are carried out, obtains optional modulus result；
Optional decision unit is used for, when current optional branch road is not last optional branch road, by described in
Optional court verdict is sent to posterior next optional branch road as interlocutory judgment result；
When current optional branch road is last optional branch road, according to the interlocutory judgment result to optional
Modulus result carries out phase judgement to obtain optional court verdict, and code is directly obtained from optional court verdict
Phase；
The optional multiple is less than second multiple；
The optional multiple of the posterior optional branch road is less than the optional multiple of the preceding optional branch road.
When optionally, comprising an optional branch road, the chip of the optional part C/A codes of the optional branch road
Number of chips of the number less than or equal to the part C/A codes of the second branch road；
During comprising two or more optional branch roads, with receive the second court verdict optional branch road can
The number of chips of part C/A codes is selected less than or equal to the number of chips of the part C/A codes of the second branch road；It is posterior
The number of chips of the optional part C/A codes of optional branch road is less than or equal to the optional C/A of preceding optional branch road
The number of chips of code.
On the other hand, a kind of method for realizing code phase search of the embodiment of the present invention, including：
The same phase mixing results of code phase search circuit and orthogonal mixing results are merged into generation complex signal；
The down-sampling that the first multiple is carried out to complex signal obtains the first down-sampled signal；
Using the first local conjugation result of the full C/A codes generation as caused by C/A code generators；
The first transformation results are obtained after first down-sampled signal of acquisition is carried out into Fourier transformation, by first
After transformation results are multiplied with the first local conjugation result of generation by multiplier, Fourier inversion is carried out
With modulus processing, the first modulus result is obtained；
Phase judgement is carried out to the first modulus result and obtains the first court verdict；
Using the local conjugation result of the part C/A codes generation second as caused by C/A code generators；
The sample that Fourier transformation is carried out to the complex signal for merging generation is obtained according to the first court verdict
Point；Fourier is carried out to the complex signal for merging generation according to the sample point of the carry out Fourier transformation of acquisition
The second transformation results are obtained after conversion, the second transformation results and the second local conjugation result are passed through into multiplier
After multiplication, Fourier inversion and modulus processing are carried out, obtains the second modulus result；
Phase judgement is carried out to the second modulus result with reference to the first court verdict and obtains the second court verdict, and
Code phase is obtained according to the second court verdict.
Optionally, obtaining code phase according to the second court verdict includes：
Phase judgement is carried out to the second modulus result with reference to first court verdict to obtain second to sentence
Certainly result, and directly obtain code phase from second court verdict.
Optionally, before carrying out Fourier transformation to the complex signal for merging generation, methods described also includes：
The down-sampling that the second multiple is carried out to the complex signal for merging generation obtains the second down-sampled signal；
Second multiple is less than first multiple.
Optionally, the sample point for carrying out Fourier transformation is attached including the first court verdict, the first court verdict
Default near sample point.
Optionally, obtaining code phase according to the second court verdict includes：
Phase judgement is carried out to the second modulus result according to first court verdict to obtain second to sentence
Certainly result, using second court verdict of acquisition as interlocutory judgment result；
The down-sampling that optional multiple is carried out to the complex signal for merging generation obtains optional down-sampled signal；
Using the optional local conjugation result of the optional part C/A codes generation as caused by C/A code generators；
Optional transformation results are obtained after optional down-sampled signal is carried out into Fourier transformation, optional conversion is tied
After fruit is multiplied with the optional local conjugation result of generation by multiplier, Fourier inversion and modulus are carried out
Processing, obtains optional modulus result；
Phase judgement is carried out to optional modulus result according to the interlocutory judgment result to tie to obtain optional judgement
Fruit, code phase is directly obtained from optional court verdict；Or,
Using the optional court verdict as interlocutory judgment result, and according to interlocutory judgment result in Hou Chu
The optional modulus result that reason obtains is handled, and obtains code phase.
Optionally, carry out processing in the optional modulus result of rear acquisition and include：
The complex signal for merging generation is carried out to adopt in the case where the down-sampling acquisition of the optional multiple of post processing is optional
Sample signal；
Using as caused by C/A code generators the generation of optional part C/A codes in the optional local of post processing
It is conjugated result；
The optional conversion knot in post processing will be obtained after posterior optional down-sampled signal progress Fourier transformation
Fruit, optional local conjugation result will be being post-processed by multiplying in the optional transformation results of post processing and generation
After musical instruments used in a Buddhist or Taoist mass is multiplied, Fourier inversion and modulus processing are carried out, obtains and is post-processing optional modulus result；
It is less than the optional multiple in preceding processing in the optional multiple of the down-sampling of post processing.
Optionally, the number of chips of optional part C/A codes is less than or equal to the number of chips of part C/A codes；
It is less than or equal to the optional C/A codes in preceding processing in the number of chips of the optional part C/A codes of post processing
Number of chips.
Compared with prior art, technical scheme includes：The same phase of code phase search circuit is mixed
As a result generation complex signal is merged with orthogonal mixing results；The down-sampling of the first multiple is carried out to complex signal
Obtain the first down-sampled signal；It is local using first of the full C/A codes generation as caused by C/A code generators
It is conjugated result；The first transformation results are obtained after first down-sampled signal of acquisition is carried out into Fourier transformation,
After first transformation results are multiplied with the first local conjugation result of generation by multiplier, Fourier is carried out
Inverse transformation and modulus processing, obtain the first modulus result；Phase judgement is carried out to the first modulus result to obtain
First court verdict；Using the local conjugation knot of the part C/A codes generation second as caused by C/A code generators
Fruit；The sample point that Fourier transformation is carried out to the complex signal for merging generation is obtained according to the first court verdict；
Fourier transformation is carried out to the complex signal for merging generation according to the sample point of the carry out Fourier transformation of acquisition
After obtain the second transformation results, the second transformation results are multiplied with the second local conjugation result by multiplier
Afterwards, Fourier inversion and modulus processing are carried out, obtains the second modulus result；With reference to the first court verdict
Phase judgement is carried out to the second modulus result and obtains the second court verdict, and is obtained according to the second court verdict
Code phase.The embodiment of the present invention obtains code phase by doing the processing such as down-sampling to complex signal, realizes
The guarantee of code phase search precision and the reduction of complexity.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms one of the application
Point, schematic description and description of the invention is used to explain the present invention, does not form to the present invention's
Improper restriction.In the accompanying drawings：
Fig. 1 is the code phase search circuit theory diagrams in correlation technique；
Fig. 2 is the structured flowchart for the device that the embodiment of the present invention realizes code phase search；
Fig. 3 is the flow chart for the method that the embodiment of the present invention realizes code phase search；
Fig. 4 is the structured flowchart that the present invention applies exemplary device.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with accompanying drawing
Embodiments of the invention are described in detail.It should be noted that in the case where not conflicting, this Shen
Please in embodiment and embodiment in feature can mutually be combined.
Fig. 2 is the structured flowchart for the device that the embodiment of the present invention realizes code phase search, as shown in Fig. 2 bag
Include：Synthesis unit, tie point and the second branch road；Wherein,
Synthesis unit is used for, and the same phase mixing results of code phase search circuit and orthogonal mixing results are merged
Complex signal is generated, and is sent to tie point and the second branch road；
It should be noted that the same phase mixing results of code phase search circuit are in code phase search circuit
Digital intermediate frequency input signal generates after being mixed with the sinusoidal carrier signal replicated on same phase (I) branch road,
Orthogonal mixing results be code phase search circuit in digital intermediate frequency input signal with and orthogonal (Q) branch road
The cosine carrier signal of upper duplication generates after being mixed.
Tie point includes：First sampling unit, the first local code sequence units, first module and first
Decision unit；Wherein,
First sampling unit is used for, and the down-sampling acquisition first of the first multiple is carried out to the complex signal of reception
Down-sampled signal；
First local code sequence units are used for, using the full C/A as caused by thick capture (C/A) code generator
First local conjugation result of code generation；
It should be noted that the first local code sequence units are by C/A code generators, fourier transformation module
Formed with complex conjugate block；Local code caused by thick capture (C/A) code generator, by the sheet of duplication
Ground code is fourier transformed module and complex conjugate block processing obtains local code conjugation result；
The sample rate of C/A code generators and the sampling after complex signal down-sampling in present invention method
Rate is identical；Follow-up second local sequence units composition structure and principle are identical with the first local code sequence units,
Do not repeat.
First module is used for, and the first transformation results are obtained after the first down-sampled signal is carried out into Fourier transformation,
The first local conjugation result that first transformation results and the first local code sequence units are generated passes through multiplier
After multiplication, Fourier inversion and modulus processing are carried out, obtains the first modulus result；
First decision unit is used for, and phase judgement is carried out to the first modulus result and obtains the first court verdict；
It should be noted that carry out phase judgement method for those skilled in the art conventional techniques,
Optionally, selection maximum or the mode such as maximum and the median of second largest value can be used to obtain second
Court verdict.
Second branch road includes：Second local code sequence units, second unit and the second decision unit；Wherein,
Second local code sequence units are used for, and are generated using the part C/A codes as caused by C/A code generators
Second local conjugation result；
Second unit is used for, and the first court verdict obtained according to tie point, which obtains, to be believed the plural number of reception
Number carry out Fourier transformation sample point；Plural number is believed according to the sample point of the carry out Fourier transformation of acquisition
Number carry out Fourier transformation after obtain the second transformation results, by the second transformation results and the second local code sequence
After second local conjugation result of unit generation is multiplied by multiplier, Fourier inversion and modulus are carried out
Processing, obtain the second modulus result；
Second decision unit is used for, and carries out phase judgement to the second modulus result with reference to the first court verdict and obtains
The second court verdict is obtained, and code phase is obtained according to the second court verdict.
It should be noted that it is with reference to the rough code obtained in the first court verdict with reference to the first court verdict
The result of calculation of phase, i.e., the concrete numerical value of the first court verdict obtained according to calculating in real time, according to obtaining
The result of calculation of the rough code phase obtained.
Optionally, the second decision unit is specifically used for,
With reference to the first court verdict from the first decision unit to the second modulus result carry out phase judgement with
The second court verdict is obtained, and code phase is directly obtained from the second court verdict.
Optionally, the second branch road also includes the second sampling unit, for carrying out the to the complex signal of reception
The down-sampling of diploidy number obtains the second down-sampled signal；
Second multiple is less than the first multiple.
Optionally, the sample point for carrying out Fourier transformation is attached including the first court verdict, the first court verdict
Default near sample point.
It should be noted that the default sample point near the first court verdict includes：Tied by the first judgement
Default sample point before fruit and after the first court verdict；Of sample point before first court verdict
The number of sample point after number and the first court verdict can incorporate experience into value according to simulation result and be divided
Analysis determines that, in the case where meeting to require, the number of sample point is more few better in theory in sample point set；
If the result that the first Coherent processing obtains is：Then the first court verdict
For：Pc=argmaxn(|z1(n)|)；
First court verdict pcFor pthcBefore individual sample point, the first court verdict and the first court verdict it
Default sample point afterwards, it is assumed that sample point set is R (n), takes and sentences before the first court verdict with first
Certainly each 10 sample points after result, totally 21 sample points be used to forming sample point set, note n=0,1,
2、…、20；As 10≤2*pc≤ 2045-10, R (n) span are [2*pc-10,2*pc+ 10], walk
Enter for 1 sample point；Work as 2*pcDuring ＜ 10, R (n) span is
[mod(2*pc-10,2046),2045]+[0,2*pc+ 10], stepping is 1 sample point；Work as 2*pc＞ 2045-10
When, R (n) span is [2*pc-10,2045]+[0,mod(2*pc+ 10,2046)], stepping is 1 sample
This point.
Device of the embodiment of the present invention also includes one or more optional branch roads；
Second decision unit is specifically used for, and the second modulus result is carried out according to the first court verdict of reception
Phase is adjudicated to obtain the second court verdict, is sent out the second court verdict of acquisition as interlocutory judgment result
Toward optional branch road；
Synthesis unit is additionally operable to, and the complex signal for merging generation is sent into each optional branch road；
Each optional branch road includes corresponding respectively：Optional sampling unit, optional local code sequence units,
Selectable unit and optional decision unit；Wherein,
Optional sampling unit is used for, and the down-sampling acquisition to the optional multiple of complex signal progress of reception is optional
Down-sampled signal；
Optional local code sequence units are used for, using the optional part C/A codes as caused by C/A code generators
The optional local conjugation result of generation；
Selectable unit is used for, and optional transformation results are obtained after optional down-sampled signal is carried out into Fourier transformation,
The optional local conjugation result that optional transformation results and optional local code sequence units are generated passes through multiplier
After multiplication, Fourier inversion and modulus processing are carried out, obtains optional modulus result；
Optional decision unit is used for, will be optional when current optional branch road is not last optional branch road
Court verdict is sent to posterior next optional branch road as interlocutory judgment result；
When current optional branch road is last optional branch road, according to interlocutory judgment result to optional modulus
As a result phase judgement is carried out to obtain optional court verdict, and code phase is directly obtained from optional court verdict；
Optional multiple is less than the second multiple；
The optional multiple of posterior optional branch road is less than the optional multiple of preceding optional branch road.
It should be noted that preceding and can be entered by the order of connection of optional branch road and the second branch road after
Row distinguish, exemplified by comprising the optional branch road of two-way, the second branch road export the second court verdict to it is preceding can
After selecting branch road, preceding optional branch road is defeated by the result of the optional phase decision unit of preceding optional branch road
Go out to posterior optional branch road.
In addition, those skilled in the art need according to the Least sampling rate of system require carry out the first multiple,
The setting of second multiple and optional multiple；Such as, in GPS system, it is minimum to use rate as 1.023Mhz,
When first multiple, the second multiple and optional multiple are then set, it is necessary to meet Least sampling rate requirement.
When optionally, comprising an optional branch road, the number of chips of the optional part C/A codes of optional branch road is small
In or equal to the second branch road part C/A codes number of chips；
During comprising two or more optional branch roads, with receive the second court verdict optional branch road can
The number of chips of part C/A codes is selected less than or equal to the number of chips of the part C/A codes of the second branch road；It is posterior
The number of chips of the optional part C/A codes of optional branch road is less than or equal to the optional C/A of preceding optional branch road
The number of chips of code.
It should be noted that the part C/A codes that are included of part C/A codes, optional part C/A codes can be with
The chip of sorted in full C/A codes chip or other setting sorting positions up front is chosen, if chosen
The chip of other positions, those skilled in the art can be according to the position adjustments of selected part C/A codes
Parameter, to carry out relevant treatment；When choosing the chip of sequence up front, system sets the simplest.
Fig. 3 is the flow chart for the method that the embodiment of the present invention realizes code phase search, as shown in figure 3, bag
Include：
Step 300, the same phase mixing results of code phase search circuit and orthogonal mixing results are merged into generation
Complex signal；
Step 301, down-sampling the first down-sampled signal of acquisition that the first multiple is carried out to complex signal；
Step 302, the first local conjugation knot using the full C/A codes generation as caused by C/A code generators
Fruit；
Step 303, obtain the first conversion knot after the first down-sampled signal of acquisition is carried out into Fourier transformation
Fruit, after the first transformation results are multiplied with the first local conjugation result of generation by multiplier, carry out Fu
In leaf inverse transformation and modulus processing, obtain the first modulus result；
Step 304, phase judgement the first court verdict of acquisition is carried out to the first modulus result；
Step 305, using as caused by C/A code generators, locally conjugation is tied for part C/A codes generation second
Fruit；
Step 306, the complex signal progress Fourier's change generated to merging is obtained according to the first court verdict
The sample point changed；The complex signal for merging generation is entered according to the sample point of the carry out Fourier transformation of acquisition
The second transformation results are obtained after row Fourier transformation, the second transformation results and the second local conjugation result are led to
After crossing multiplier multiplication, Fourier inversion and modulus processing are carried out, obtains the second modulus result；
Step 307, with reference to the first court verdict carry out phase judgement to the second modulus result and obtain second to sentence
Certainly result, and code phase is obtained according to the second court verdict.
Optionally, obtaining code phase according to the second court verdict includes：
Phase judgement is carried out to the second modulus result with reference to the first court verdict to obtain the second court verdict,
And directly obtain code phase from the second court verdict.
Optionally, before carrying out Fourier transformation to the complex signal for merging generation, embodiment of the present invention side
Method also includes：
The down-sampling that the second multiple is carried out to the complex signal for merging generation obtains the second down-sampled signal；
Second multiple is less than the first multiple.
Optionally, the sample point for carrying out Fourier transformation is attached including the first court verdict, the first court verdict
Default near sample point.
Optionally, obtaining code phase according to the second court verdict includes：
Phase judgement is carried out to the second modulus result according to the first court verdict to obtain the second court verdict,
Using the second court verdict of acquisition as interlocutory judgment result；
The down-sampling that optional multiple is carried out to the complex signal for merging generation obtains optional down-sampled signal；
Using the optional local conjugation result of the optional part C/A codes generation as caused by C/A code generators；
Optional transformation results are obtained after optional down-sampled signal is carried out into Fourier transformation, optional conversion is tied
After fruit is multiplied with the optional local conjugation result of generation by multiplier, Fourier inversion and modulus are carried out
Processing, obtains optional modulus result；
Phase judgement is carried out to optional modulus result according to interlocutory judgment result to obtain optional court verdict,
Code phase is directly obtained from optional court verdict；Or,
Using optional court verdict as interlocutory judgment result, and according to interlocutory judgment result to being obtained in post processing
The optional modulus result obtained is handled, and obtains code phase.
Optionally, carry out processing in the optional modulus result of rear acquisition and include：
The complex signal for merging generation is carried out to adopt in the case where the down-sampling acquisition of the optional multiple of post processing is optional
Sample signal；
Using as caused by C/A code generators the generation of optional part C/A codes in the optional local of post processing
It is conjugated result；
The optional conversion knot in post processing will be obtained after posterior optional down-sampled signal progress Fourier transformation
Fruit, optional local conjugation result will be being post-processed by multiplying in the optional transformation results of post processing and generation
After musical instruments used in a Buddhist or Taoist mass is multiplied, Fourier inversion and modulus processing are carried out, obtains and is post-processing optional modulus result；
It is less than the optional multiple in preceding processing in the optional multiple of the down-sampling of post processing.
Optionally, the number of chips of optional part C/A codes is less than or equal to the number of chips of part C/A codes；
It is less than or equal to the optional C/A codes in preceding processing in the number of chips of the optional part C/A codes of post processing
Number of chips.
Present invention method, code phase is obtained by doing the processing such as down-sampling to complex signal, is realized
The guarantee of code phase search precision and the reduction of complexity.
The inventive method is carried out to understand detailed description below by way of using example, is only used for using example
The statement present invention, it is not intended to limit the present invention the protection domain of method.
Using example
This application exemplary device includes synthesis unit, tie point, the second branch road, optional branch road 1 and can
Select branch road 2；Fig. 4 is the structured flowchart that the present invention applies exemplary device, as shown in figure 4, including：
In correlation technique, the input signal of code phase search circuit is the digital medium-frequency signal of high sampling rate,
The signal of digital controlled oscillator (NCO) output generates sinusoidal carrier signal and remaining by sine table and cosine table
After string carrier signal, digital intermediate frequency input signal is entered with the sinusoidal carrier signal replicated on same phase (I) branch road
Generation is with phase mixing results after row mixing, digital intermediate frequency input signal with and orthogonal (Q) branch road on replicate
Cosine carrier signal be mixed after generate orthogonal mixing results；
Orthogonal mixing results and after being handled with phase mixing results by synthesis unit, merge generation by orthogonal mixed
Frequency result and the complex signal formed with phase mixing results, first is sent to by the complex signal of generation respectively
Road, the second branch road, optional branch road 1 and optional branch road 2；
Tie point includes：First sampling unit, the first local code sequence units, first module and first
Decision unit；Wherein,
First sampling unit is used for, and the down-sampling acquisition first of the first multiple is carried out to the complex signal of reception
Down-sampled signal；
It should be noted that sample rate and processing complexity are reduced by the down-sampling of the first sampling unit.
First local code sequence units are used for, using the full C/A as caused by thick capture (C/A) code generator
First local conjugation result of code generation；
First module is used for, and the first transformation results are obtained after the first down-sampled signal is carried out into Fourier transformation,
The first local conjugation result that first transformation results and the first local code sequence units are generated passes through multiplier
After multiplication, Fourier inversion and modulus processing are carried out, obtains the first modulus result；
This application example, one section of progress Fourier transformation, data length are taken to the complex data after down-sampling
Determined according to sample rate and full C/A code lengths.Full C/A codes (i.e. 1ms is produced using C/A code generators
Time span, corresponding 1023 chips), it is multiple wherein after the data sampling rate and down-sampling of C/A codes
The sample rate of number signal is identical, and C/A codes pass through Fourier transformation and complex-conjugate manipulation, local by first
The Fourier transformation result that result is conjugated with the complex signal inputted is multiplied by sample point is corresponding.To multiplication knot
Fruit carries out " Fourier inversion " operation again, and to operating result modulus, finally adjudicates mould using phase
Block finds rough code phase.
First decision unit is used for, and phase judgement is carried out to the first modulus result and obtains the first court verdict；
It should be noted that carry out phase judgement method for those skilled in the art conventional techniques,
Optionally, selection maximum or the mode such as maximum and the median of second largest value can be used to obtain second
Court verdict.
Second branch road includes：Second local code sequence units, second unit and the second decision unit；Wherein,
Second local code sequence units are used for, and are generated using the part C/A codes as caused by C/A code generators
Second local conjugation result；
Second unit is used for, and the first court verdict obtained according to tie point, which obtains, to be believed the plural number of reception
Number carry out Fourier transformation sample point；Plural number is believed according to the sample point of the carry out Fourier transformation of acquisition
Number carry out Fourier transformation after obtain the second transformation results, by the second transformation results and the second local code sequence
After second local conjugation result of unit generation is multiplied by multiplier, Fourier inversion and modulus are carried out
Processing, obtain the second modulus result；
Second decision unit is used for, and carries out phase judgement to the second modulus result with reference to the first court verdict and obtains
The second court verdict is obtained, and code phase is obtained according to the second court verdict.
It should be noted that it is with reference to the rough code obtained in the first court verdict with reference to the first court verdict
The result of calculation of phase, i.e., the concrete numerical value of the first court verdict obtained according to calculating in real time, according to obtaining
The result of calculation of the rough code phase obtained.
Optionally, the second branch road also includes the second sampling unit, for carrying out the to the complex signal of reception
The down-sampling of diploidy number obtains the second down-sampled signal；
Second multiple is less than the first multiple.
Optionally, the sample point for carrying out Fourier transformation is attached including the first court verdict, the first court verdict
Default near sample point.
It should be noted that the default sample point near the first court verdict includes：Tied by the first judgement
Default sample point before fruit and after the first court verdict；Of sample point before first court verdict
The number of sample point after number and the first court verdict can incorporate experience into value according to simulation result and be divided
Analysis determines that, in the case where meeting to require, the number of sample point is more few better in theory in sample point set；
If the result that the first Coherent processing obtains is：Then the first court verdict
For：Pc=argmaxn(|z1(n)|)；
First court verdict pcFor pthcBefore individual sample point, the first court verdict and the first court verdict it
Default sample point afterwards, it is assumed that sample point set is R (n), takes and sentences before the first court verdict with first
Certainly each 10 sample points after result, totally 21 sample points be used to forming sample point set, note n=0,1,
2、…、20；As 10≤2*pc≤ 2045-10, R (n) span are [2*pc-10,2*pc+ 10], walk
Enter for 1 sample point；Work as 2*pcDuring ＜ 10, R (n) span is
[mod(2*pc-10,2046),2045]+[0,2*pc+ 10], stepping is 1 sample point；Work as 2*pc＞ 2045-10
When, R (n) span is [2*pc-10,2045]+[0,mod(2*pc+ 10,2046)], stepping is 1 sample
This point.
This application example includes two optional branch roads, you can selects branch road 1 and optional branch road 2；
Second decision unit is specifically used for, and the second modulus result is carried out according to the first court verdict of reception
Phase is adjudicated to obtain the second court verdict, is sent out the second court verdict of acquisition as interlocutory judgment result
Toward optional branch road 1；
Synthesis unit is additionally operable to, and the complex signal for merging generation is sent into optional branch road 1 and optional branch road 2；
Each optional branch road includes corresponding respectively：Optional sampling unit, optional local code sequence units,
Selectable unit and optional decision unit；Wherein,
The optional sampling unit of optional branch road 1 is used for, and the complex signal of reception is carried out under optional multiple
Sampling obtains optional down-sampled signal；
The optional local code sequence units of optional branch road 1 are used for, using can as caused by C/A code generators
Select the optional local conjugation result of part C/A codes generation；
The selectable unit of optional branch road 1 is used for, and is obtained after optional down-sampled signal is carried out into Fourier transformation
Optional transformation results, the optional local conjugation that optional transformation results and optional local code sequence units are generated
As a result after being multiplied by multiplier, Fourier inversion and modulus processing is carried out, obtains optional modulus result；
The optional decision unit of optional branch road 1 is used for, and is sent out optional court verdict as interlocutory judgment result
Toward posterior next optional branch road；
The optional sampling unit of optional branch road 2 is used for, and the complex signal of reception is carried out under optional multiple
Sampling obtains optional down-sampled signal；
The optional local code sequence units of optional branch road 2 are used for, using can as caused by C/A code generators
Select the optional local conjugation result of part C/A codes generation；
The selectable unit of optional branch road 2 is used for, and is obtained after optional down-sampled signal is carried out into Fourier transformation
Optional transformation results, the optional local conjugation that optional transformation results and optional local code sequence units are generated
As a result after being multiplied by multiplier, Fourier inversion and modulus processing is carried out, obtains optional modulus result；
The optional decision unit of optional branch road 2 is used for, can according to the interlocutory judgment result pair of optional branch road 1
Choose mould result and carry out phase judgement to obtain optional court verdict, directly obtained from optional court verdict
Code phase；
Optional multiple is less than the second multiple；
The optional multiple of posterior optional branch road is less than the optional multiple of preceding optional branch road.
It should be noted that preceding and can be entered by the order of connection of optional branch road and the second branch road after
Row distinguish, exemplified by comprising the optional branch road of two-way, the second branch road export the second court verdict to it is preceding can
After selecting branch road, preceding optional branch road is defeated by the result of the optional phase decision unit of preceding optional branch road
Go out to posterior optional branch road.This application example, optional branch road 1 are preceding optional branch road, optional branch
Road 2 is posterior optional branch road.
In addition, those skilled in the art need according to the Least sampling rate of system require carry out the first multiple,
The setting of second multiple and optional multiple；Such as, in GPS system, it is minimum to use rate as 1.023Mhz,
When first multiple, the second multiple and optional multiple are then set, it is necessary to meet Least sampling rate requirement.
When optionally, comprising an optional branch road, the number of chips of the optional part C/A codes of optional branch road is small
In or equal to the second branch road part C/A codes number of chips；
During comprising two or more optional branch roads, with receive the second court verdict optional branch road can
The number of chips of part C/A codes is selected less than or equal to the number of chips of the part C/A codes of the second branch road；It is posterior
The number of chips of the optional part C/A codes of optional branch road is less than or equal to the optional C/A of preceding optional branch road
The number of chips of code.
It is given below one and applies example, signal is carried out only to include the situation of tie point and the second branch road
Handling process explanation.
Assuming that the sample rate of the digital medium-frequency signal of input is 2.046MHz, after mixing, answered
The mixing results data of number signal.In tie point, 2 times of down-samplings are first carried out, sample rate is changed into 1.023
MHz.The local full C/A codes that sample rate is 1.023MHz are produced, totally 1023 chips.Carry out Fu
In leaf transformation and the local conjugation result of complex-conjugate manipulation generation first, be designated as, k=1,2 ..., 1023,
Also it can offline produce and prestore.From first sample point of the reception complex signal after current down-sampling
Rise, take 1023 sample points, then carry out Fourier transform operation, be as a result designated as, k=1,2 ...,
1023.Next, perform operations described below：
Fourier inversion operation is performed to Z (k) sequences again, obtains z (n), n=1,2 ..., 1023.
Next, rough code-phase bit index value is tried to achieve according to following formula,
Pc=argmaxn(|z(n)|)
Then, lower shunt operations are carried out.In lower branch road, operated without down-sampling, i.e. data sampling rate
For 2.046MHz.The part C/A of 2.046MHz sample rates is produced using part C/A code generators
Code (such as 128 chips before only producing, corresponding 256 sample points).Part C/A codes data are carried out
Fourier transformation and conjugate operation, are equally designated as, k=1,2 ..., 256.
Next, according to pcSpecific value, selection receive data index value.If 127≤2*pc, then
The index range that selection receives data is [2*pc-126,2*pc+ 129], 1 sample point of stepping；If
2*pc≤ 127, then the index range for receiving data is [2*pc-126,2046,2*pc+ 129+2046], stepping 1
Individual sample point.
The complex signal of reception to above-mentioned sample point range does Fourier transformation, is equally designated as, k=1,
2、…、256.Then, multiplication operation is performed：
Fourier inversion operation is performed to Z (k) sequences again, obtains z (n), n=1,2 ..., 256.
Similarly, according to formula, fine code phase index value is obtained,
Pf=argmaxn(|z(n)|)
Pay attention to now PfSpan be 1~256 because this is index value.
Finally, according to above-mentioned code phase indexed results, high-resolution code phase search is obtained according to following formula
As a result：
P=mod (2046- (2*pc+pf-127)+1,2046)/2
Disclosed herein embodiment as above, but described content be only readily appreciate the present invention and adopt
Embodiment, it is not limited to the present invention.Technical staff in any art of the present invention,
Do not depart from disclosed herein spirit and scope on the premise of, can be in the form and details of implementation
Any modification and change, but the scope of patent protection of the present invention are carried out, still must be with appended claim
The scope that book is defined is defined.
Claims (13)
- A kind of 1. device for realizing code phase search, it is characterised in that including：Synthesis unit, first Road and the second branch road；Wherein,Synthesis unit is used for, and the same phase mixing results of code phase search circuit and orthogonal mixing results are merged Complex signal is generated, and is sent to tie point and the second branch road；Tie point includes：First sampling unit, the first local code sequence units, first module and first Decision unit；Wherein,First sampling unit is used for, and the down-sampling acquisition first of the first multiple is carried out to the complex signal of reception Down-sampled signal；First local code sequence units are used for, using the full C/A codes as caused by slightly capturing C/A code generators The local conjugation result of the first of generation；First module is used for, and the first transformation results are obtained after the first down-sampled signal is carried out into Fourier transformation, The first local conjugation result that first transformation results and the first local code sequence units are generated passes through multiplier After multiplication, Fourier inversion and modulus processing are carried out, obtains the first modulus result；First decision unit is used for, and phase judgement is carried out to the first modulus result and obtains the first court verdict；Second branch road includes：Second local code sequence units, second unit and the second decision unit；Wherein,Second local code sequence units are used for, and are generated using the part C/A codes as caused by C/A code generators Second local conjugation result；Second unit is used for, and the first court verdict obtained according to tie point, which obtains, to be believed the plural number of reception Number carry out Fourier transformation sample point；Plural number is believed according to the sample point of the carry out Fourier transformation of acquisition Number carry out Fourier transformation after obtain the second transformation results, by the second transformation results and the second local code sequence After second local conjugation result of unit generation is multiplied by multiplier, Fourier inversion and modulus are carried out Processing, obtain the second modulus result；Second decision unit is used for, and carries out phase judgement to the second modulus result with reference to the first court verdict and obtains The second court verdict is obtained, and code phase is obtained according to the second court verdict.
- 2. device according to claim 1, it is characterised in that second decision unit is specifically used In,With reference to the first court verdict from the first decision unit to the second modulus result carry out phase judgement with The second court verdict is obtained, and code phase is directly obtained from the second court verdict.
- 3. device according to claim 1, it is characterised in thatSecond branch road also includes the second sampling unit, for carrying out second times to the complex signal of reception Several down-samplings obtains the second down-sampled signal；Second multiple is less than first multiple.
- 4. device according to claim 1, it is characterised in that the sample for carrying out Fourier transformation This point includes a default sample point near the first court verdict, the first court verdict.
- 5. the device according to claim 3 or 4, it is characterised in that the device also include one or More than one optional branch road；Second decision unit is specifically used for, according to first court verdict of reception to described second Modulus result carries out phase judgement to obtain the second court verdict, and second court verdict of acquisition is made Optional branch road is sent to for interlocutory judgment result；The synthesis unit is additionally operable to, and the complex signal for merging generation is sent into each optional branch road；Each optional branch road includes corresponding respectively：Optional sampling unit, optional local code sequence units, Selectable unit and optional decision unit；Wherein,Optional sampling unit is used for, and the down-sampling acquisition to the optional multiple of complex signal progress of reception is optional Down-sampled signal；Optional local code sequence units are used for, using the optional part C/A codes as caused by C/A code generators The optional local conjugation result of generation；Selectable unit is used for, and optional transformation results are obtained after optional down-sampled signal is carried out into Fourier transformation, The optional local conjugation result that optional transformation results and optional local code sequence units are generated passes through multiplier After multiplication, Fourier inversion and modulus processing are carried out, obtains optional modulus result；Optional decision unit is used for, when current optional branch road is not last optional branch road, by described in Optional court verdict is sent to posterior next optional branch road as interlocutory judgment result；When current optional branch road is last optional branch road, according to the interlocutory judgment result to optional Modulus result carries out phase judgement to obtain optional court verdict, and code is directly obtained from optional court verdict Phase；The optional multiple is less than second multiple；The optional multiple of the posterior optional branch road is less than the optional multiple of the preceding optional branch road.
- 6. device according to claim 5, it is characterised in thatDuring comprising an optional branch road, the number of chips of the optional part C/A codes of the optional branch road be less than or Equal to the number of chips of the part C/A codes of the second branch road；During comprising two or more optional branch roads, with receive the second court verdict optional branch road can The number of chips of part C/A codes is selected less than or equal to the number of chips of the part C/A codes of the second branch road；It is posterior The number of chips of the optional part C/A codes of optional branch road is less than or equal to the optional C/A of preceding optional branch road The number of chips of code.
- A kind of 7. method for realizing code phase search, it is characterised in that including：The same phase mixing results of code phase search circuit and orthogonal mixing results are merged into generation complex signal；The down-sampling that the first multiple is carried out to complex signal obtains the first down-sampled signal；Using the first local conjugation result of the full C/A codes generation as caused by C/A code generators；The first transformation results are obtained after first down-sampled signal of acquisition is carried out into Fourier transformation, by first After transformation results are multiplied with the first local conjugation result of generation by multiplier, Fourier inversion is carried out With modulus processing, the first modulus result is obtained；Phase judgement is carried out to the first modulus result and obtains the first court verdict；Using the local conjugation result of the part C/A codes generation second as caused by C/A code generators；The sample that Fourier transformation is carried out to the complex signal for merging generation is obtained according to the first court verdict Point；Fourier is carried out to the complex signal for merging generation according to the sample point of the carry out Fourier transformation of acquisition The second transformation results are obtained after conversion, the second transformation results and the second local conjugation result are passed through into multiplier After multiplication, Fourier inversion and modulus processing are carried out, obtains the second modulus result；Phase judgement is carried out to the second modulus result with reference to the first court verdict and obtains the second court verdict, and Code phase is obtained according to the second court verdict.
- 8. device according to claim 7, it is characterised in that described to be obtained according to the second court verdict Obtaining code phase includes：Phase judgement is carried out to the second modulus result with reference to first court verdict to obtain second to sentence Certainly result, and directly obtain code phase from second court verdict.
- 9. device according to claim 7, it is characterised in that the described pair of plural number letter for merging generation Number carry out Fourier transformation before, methods described also includes：The down-sampling that the second multiple is carried out to the complex signal for merging generation obtains the second down-sampled signal；Second multiple is less than first multiple.
- 10. according to the method for claim 7, it is characterised in that the progress Fourier transformation Sample point includes a default sample point near the first court verdict, the first court verdict.
- 11. the device according to claim 7 or 8, it is characterised in that described according to the second judgement As a result obtaining code phase includes：Phase judgement is carried out to the second modulus result according to first court verdict to obtain second to sentence Certainly result, using second court verdict of acquisition as interlocutory judgment result；The down-sampling that optional multiple is carried out to the complex signal for merging generation obtains optional down-sampled signal；Using the optional local conjugation result of the optional part C/A codes generation as caused by C/A code generators；Optional transformation results are obtained after optional down-sampled signal is carried out into Fourier transformation, optional conversion is tied After fruit is multiplied with the optional local conjugation result of generation by multiplier, Fourier inversion and modulus are carried out Processing, obtains optional modulus result；Phase judgement is carried out to optional modulus result according to the interlocutory judgment result to tie to obtain optional judgement Fruit, code phase is directly obtained from optional court verdict；Or,Using the optional court verdict as interlocutory judgment result, and according to interlocutory judgment result in Hou Chu The optional modulus result that reason obtains is handled, and obtains code phase.
- 12. device according to claim 11, it is characterised in that the choosing in rear acquisition Mould result, which carries out processing, to be included：The complex signal for merging generation is carried out to adopt in the case where the down-sampling acquisition of the optional multiple of post processing is optional Sample signal；Using as caused by C/A code generators the generation of optional part C/A codes in the optional local of post processing It is conjugated result；The optional conversion knot in post processing will be obtained after posterior optional down-sampled signal progress Fourier transformation Fruit, optional local conjugation result will be being post-processed by multiplying in the optional transformation results of post processing and generation After musical instruments used in a Buddhist or Taoist mass is multiplied, Fourier inversion and modulus processing are carried out, obtains and is post-processing optional modulus result；It is less than the optional multiple in preceding processing in the optional multiple of the down-sampling of post processing.
- 13. device according to claim 11, it is characterised in thatThe number of chips of the optional part C/A codes is less than or equal to the number of chips of part C/A codes；It is less than or equal to the optional C/A codes in preceding processing in the number of chips of the optional part C/A codes of post processing Number of chips.
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