CN106980125A - The drop amount of calculation deblurring processing method that XFAST is captured in a kind of satellite navigation - Google Patents

The drop amount of calculation deblurring processing method that XFAST is captured in a kind of satellite navigation Download PDF

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CN106980125A
CN106980125A CN201610027480.XA CN201610027480A CN106980125A CN 106980125 A CN106980125 A CN 106980125A CN 201610027480 A CN201610027480 A CN 201610027480A CN 106980125 A CN106980125 A CN 106980125A
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code
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xfast
calculation
alignment
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CN106980125B (en
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姚彦鑫
赵盼盼
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Beijing Information Science and Technology University
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/35—Constructional details or hardware or software details of the signal processing chain
    • G01S19/37—Hardware or software details of the signal processing chain

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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)
  • Signal Processing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

The present invention relates to the drop amount of calculation deblurring processing method that XFAST in a kind of satellite navigation is captured, it is characterized in that：After obtaining slightly catching alignment code phase result using extension duplication overlay method (XFAST), first unfolded local code sequence is rearranged, is segmented according to alignment code phase, section cyclic shifts etc. are operated, then carry out intersegmental overlapping, pass through FFT-IFFT computings realization circulation related operation with receiving code again, so that it is determined that the subcode section where alignment code phase, is obtained without fuzzy capture result by calculating.The advantage of the invention is that：Under conditions of certain relation can be met locally folding hop count and subsegment length, do not reducing on the premise of essence catches detection performance, greatly reducing the amount of calculation of deblurring degree, improve acquisition speed.

Description

The drop amount of calculation deblurring processing method that XFAST is captured in a kind of satellite navigation
Technical field
The present invention relates to the drop amount of calculation deblurring processing method that XFAST in a kind of satellite navigation is captured, available for adopting Long PN codes are carried out after Direct Acquisition with XFAST methods, the fuzziness that alignment code phase is present is removed.
Background technology
Gps signal uses two kinds of different pseudo noise codes of C/A codes and P codes.Wherein C/A codes are referred to as thick code, are a kind of low codes The short code that rate, cycle repeat；P codes are referred to as smart code, are a kind of high code check, long period, encryption pseudo noise code.Traditional P Code acquisitions one As using C/A codes guiding by the way of, but C/A code code checks it is low, easily by enemy disturb and cheat, strong jamming and cheat war Strive in environment, aided capture is difficult to realize.Because P codes have the characteristic of the counter-measure and anti-spoofing more stronger than C/A codes, therefore will Seek the ability possessed in military communication and navigation system to the quick Direct Acquisition of P codes.
Because P codes have 6.1871 × 1012Individual code element, completion P code Direct Acquisitions need the capture time grown very much and huge Amount of calculation.For this problem, recent domestic has carried out substantial amounts of research for the Direct Acquisition technology of P codes.Typical P Code Direct Acquisition Methods have：Zero padding method (Zero-Padding Method, ZPM), extension replicate overlay method (Extended Replica Folding Acquisition Search Technique, XFAST), the direct method of average (Direct Average Method, DAM), the overlapping method of average (Overlap Average Method, OAM), and various differentiation sides on this basis Method.Wherein XFAST proposed by Yang C in 1999, was to carry out M sections by the local code that is M × N by length in place of its core Fold, carry out related operation for N reception code using folded code and length, pseudo-code phase parallel search scope is extended to (M- 1) × N+1 code phase, compared with other method, XFAST methods can significantly improve search efficiency.
The code phase obtained due to being caught at the beginning of XFAST has fuzziness, i.e. foldover artifacts, in order to obtain accurate pseudo-code phase Value is, it is necessary to be removed the processing of foldover artifacts degree, alternatively referred to as essence is caught.Existing deblurring processing method is：Obtained according to just catching Alignment code phase, unfolded local code is rearranged, is segmented, then by each new subcode section respectively with receiving code in time domain Middle progress linear correlation computing, the corresponding code section of maximum related value is the subcode section where the alignment code phase just caught and obtained. Party's law limitation is：When locally folding hop count and subsegment length and meeting certain condition, the amount of calculation of linear correlation in the time domain Can be very big, influence acquisition speed.
The content of the invention
Present invention solves the technical problem that being：In satellite navigation system, overlay method (XFAST) is replicated to long PN using extension When code carries out Direct Acquisition, there is foldover artifacts degree in the alignment code phase obtained after just catching.To reduce the calculating of deblurring processing Amount, improves acquisition speed, it is proposed that a kind of based on the new deblurring processing scheme caught at the beginning of XFAST, and the method is caught not reducing essence Detect in terms of performance, the amount of calculation for reducing deblurring processing and raising acquisition speed that there is advantage.
The characteristics of the technology of the present invention solution, is to comprise the following steps：
1) assume that it is N that code length is received during being caught at the beginning of XFAST, it is M that local code, which folds hop count, and local subcode segment length is N.Root The local chip C and its position x in local folded code of alignment obtained according to just catching, unfolded local code is rearranged, divided Section.With first original chip c in chip C1For starting point, local code is rearranged, the subcode that M sections of segment lengths are N is then divided into Section.
2) each subcode section sequence difference ring shift right, shift amount is that corresponding subcode segment number subtracts one.
3) each subcode section sequence pair after displacement should be added, new a length of N folded code sequence is obtained, to new Folded code sequence carries out N point FFT computings.
4) by step 3) in result of calculation with receive code FFT result of calculations carry out complex conjugate multiplication.
5) by step 4) in obtained result carry out N point IFFT computings, in obtained N number of correlation, determining maximum Corresponding local chip position number y, is the local subcode section sequence number where the alignment code phase just caught and obtained.
6) according to the subcode section sequence number y that obtained code phase location x and deblurring processing are determined just is caught, reception is calculated Particular location where the code phase of code sequence and local code sequence alignment is x+N × (y-1), may thereby determine that reception code with The specific code phase locally alignd.
The present invention principle be：According to the excellent autocorrelation performance of P codes, the correlation peak location that code alignment occurs is followed pair Neat code cyclic shift and correspondingly shift, and peak value size is not influenceed, equally the cross-correlation to the not perfectly aligned generation of code Noise does not also influence.Then, to just catching during unfolded local code rearrange, be segmented, fold after section cyclic shifts, Then realize that circulation is related by FFT-IFFT computings to reception code again.Maximum in correlated results determines alignment code-phase Specific subcode section where position.
The advantage of the present invention compared with prior art is：Existing deblurring method is to receive code and each local subcode section Linear correlation is distinguished in the time domain, and the present invention is utilizing FFT-IFFT after folding is rearranged to local code with receiving code Computing realizes that circulation is related.When locally folding hop count and subcode segment length are met under certain condition, detection performance is caught not reducing essence On the premise of, the amount of calculation of deblurring degree is greatly reduced, acquisition speed is improved.
Brief description of the drawings
Fig. 1 is the operational flowchart of the inventive method.
Fig. 2 catches analogous diagram at the beginning of XFAST.
Fig. 3 is that deblurring proposed by the present invention handles analogous diagram.
Embodiment
The baseband signal of reception, in-phase component, quadrature component can respectively be represented with below equation：
sl=sI, l+jsQ, l(l=0,1,2 ...) (1)
In formula, A is signal amplitude, dl+λ∈ {+1, -1 } is navigation message, fDFor Doppler shift, Δ t is the sampling interval, and λ is reception signal Pseudo-code phase,For carrier wave initial phase, cl+λ∈ {+1, -1 } is modulation spreading code, nI, lAnd nQ, lFor additive white Gaussian noise, l For sampled value call number.
Receive signal sample sequenceLength takes N, whereinFor same phase sequence Row,For orthogonal sequence.Receiver produces local random code with nominal pseudo- code frequency, sampled Code sequence is c afterwardsl+δ(l=0,1,2 ...), δ is local pseudo-code phase.
XFAST methods make use of the cross correlation of subcode sequence, and its principle is, according to reception signal sample sequenceLength N, be extended in the case of M sections, produce length be M × N local pseudo-code sequence cl+δ(l=0,1, 2 ..., MN-1), it is divided into the subcode sequence that M segment length is NAnd it is sub by M Code sequence is overlapped, and constitutes a new a length of N overlapping code sectionLocally Folded code is related to the progress circulation of received signal code sequence, when there is correlation peak higher than decision threshold, just catches completion, obtains There is the alignment code phase of fuzziness.
The existing deblurring of XFAST methods is processed as, according to obtained alignment code phase is just caught, by unfolded local code weight New segmentation：Local code is rearranged using first original chip in the chip that aligns as starting point, the son that M sections of length are N is then divided into Code section.Each new subcode section is subjected to linear correlation computing in the time domain with reception code in time domain respectively, M obtained correlation In, the corresponding code section of maximum is the subcode section where the alignment code phase just caught and obtained.
Assuming that the local code phase that just process of catching is alignd is C, chip C is by source code [c1, c2..., cM] superposition and Into comprising the following steps that：
1) assume that it is N that code length is received during being caught at the beginning of XFAST, it is M that local code, which folds hop count, and local subcode segment length is N.Root The local chip C and its position x in local folded code of alignment obtained according to just catching, unfolded local code is rearranged, divided Section.With first original chip c in chip C1For starting point, local code is rearranged, the subcode that M sections of segment lengths are N is then divided into Section.
2) each subcode section sequence difference ring shift right, shift amount is that corresponding subcode segment number subtracts one.
3) each subcode section sequence pair after displacement should be added, new a length of N folded code sequence is obtained, to new Folded code sequence carries out N point FFT computings.
4) by step 3) in result of calculation with receive code FFT result of calculations carry out complex conjugate multiplication.
5) by step 4) in obtained result carry out N point IFFT computings, in obtained N number of correlation, determining maximum Corresponding local chip position number y, is the local subcode section sequence number where the alignment code phase just caught and obtained.
6) according to the subcode section sequence number y that obtained code phase location x and deblurring processing are determined just is caught, reception is calculated Particular location where the code phase of code sequence and local code sequence alignment is x+N × (y-1), may thereby determine that reception code with The specific code phase locally alignd.
According to existing deblurring method, each the local subcode section being segmented again is carried out respectively in the time domain with receiving code Linear correlation, is carried out M times altogether.Each related operation multiplication computation amount is M, and additional calculation amount is N-1, then total multiplication computation amount For M × N, total additional calculation amount is M × (N-1).
According to deblurring method flow proposed by the present invention, the local code sequence for rearranging, being segmented is subjected to M sections of foldings Into the new code sequence that length is N, additional calculation amount is (M-1) × N；Carry out N point FFT computings, multiplication computation amountPlus Method amount of calculation N log2N；Complex conjugate multiplication, multiplication computation amount is N；The result of calculation of complex conjugate multiplication carries out N point IFFT, multiplication Amount of calculation isAdditional calculation amount is N log2N.To sum up, the multiplication computation amount of new deblurring method is N log2N+N, Additional calculation amount is (M-1) × N+2N log2N。
Comparatively multiplication computation amount is more much larger than additional calculation amount, so as to only consider the amount of calculation of multiplication.Existing mould from Multiplication computation amount M × N of formulating method, the multiplication computation amount N log of new deblurring method2N+N.Two kinds of deblurring methods are multiplied Method amount of calculation is compared, when meeting following condition：
N log2N+N ＜ M × N (2)
That is N ＜ 2M-1When, deblurring method proposed by the present invention is smaller than existing deblurring method amount of calculation, correspondingly adds The fast speed of deblurring.When the conditions are satisfied, new deblurring method drops relative to the amount of calculation of existing deblurring method Low percentage is：
Wherein, M is that local copy codes fold hop count, and N is reception code length.
Assuming that receive code length N takes 65536 (2 respectively16) and 32768 (215), local code extension, which replicates overlapping hop count M, expires During sufficient formula (2) condition, according to formula (3), deblurring processing proposed by the present invention is calculated based on the processing of existing deblurring The percentage of calculation amount reduction, compares result of calculation as shown in table 1.
The data analysis of table 1
Receive code length N It is local to fold hop count M 2M-1 Amount of calculation reduces percentage
65536(216) 18 131072 5.56%
65536(216) 19 262144 10.53%
65536(216) 20 524288 15%
65536(216) 21 1048576 19.05%
32768(215) 17 65536 5.88%
32768(215) 18 131072 11.11%
32768(215) 19 262144 15.79%
32768(215) 20 524288 20%
Under windows platform, functional simulation is carried out to new deblurring method proposed by the present invention by MATLAB.Assuming that It is 256 to receive code length N；Local code overall length 4096, it is 16 to fold hop count M, is 256 per segment length N, receives code and take local code sequence Data between 573 to 828th.Fig. 2 catches analogous diagram at the beginning of XFAST, and Fig. 3 is that deblurring proposed by the present invention handles analogous diagram.
Simulation waveform is observed, obtained 61st chip of the code phase in local folded code that align is caught at the beginning of XFAST, Deblurring processing obtains 3rd subcode section of the code phase in local code of aliging, and reception code and local code are learnt so as to calculate The specific code phase of alignment is at the 573rd (61+256 × (3-1)) individual chip of local code, with the setting phase in simulated conditions Together.Simulation result illustrate, new deblurring method proposed by the present invention can accurately determine alignment code phase where it is local Numeral section.

Claims (5)

1. the drop amount of calculation deblurring processing method that XFAST is captured in a kind of satellite navigation, it is characterised in that comprise the following steps：
1) assume that it is N that code length is received during being caught at the beginning of XFAST, it is M that local code, which folds hop count, and local subcode segment length is N.According to first The obtained local chip C and its position x in local folded code of alignment is caught, unfolded local code is rearranged, is segmented.With First original chip C in chip C1For starting point, local code is rearranged, the subcode section that M sections of segment lengths are N is then divided into.
2) each subcode section sequence difference ring shift right, shift amount is that corresponding subcode segment number subtracts one.
3) each subcode section sequence pair after displacement should be added, new a length of N folded code sequence is obtained, to new folding Code sequence carries out N point FFT computings.
4) by step 3) in result of calculation with receive code FFT result of calculations carry out complex conjugate multiplication.
5) by step 4) in obtained result carry out N point IFFT computings, in obtained N number of correlation, determining maximum correspondence Local chip position number y, be just catch obtain alignment code phase where local subcode section sequence number.
6) according to the subcode section sequence number y that obtained code phase location x and deblurring processing are determined just is caught, reception code sequence is calculated Row are x+N × (y-1) with the particular location where the code phase of local code sequence alignment, may thereby determine that reception code and local The specific code phase of alignment.
2. the drop amount of calculation deblurring processing method that XFAST is captured in a kind of satellite navigation according to claim 1, it is special Levy and be：Step 1) the local chip of obtained alignment is caught at the beginning of the XFAST for C, it is assumed that and chip C is by source code [c for alignment1, c2..., cM] be formed by stacking, i.e. C=c1+c2+c3+...+cM。
3. the drop amount of calculation deblurring processing method that XFAST is captured according to claim a kind of satellite navigation, its feature It is：Step 1) it is described rearrange local code, i.e. basis just catches obtained code phase location unfolded local code sequence is entered Row ring shift left, shift amount is just to catch obtained code phase location value to subtract one.For example, just catching obtained alignment code phase location For x, then the shift amount of ring shift left is x-1, so as to make, just to catch first original chip in obtained chip be local code sequence The starting point of row.
4. the drop amount of calculation deblurring processing method that XFAST is captured in a kind of satellite navigation according to claim 1, it is special Levy and be：Step 2) shift amount is that corresponding subcode segment number subtracts one, for example, the 1st section of ring shift right 0, the 2nd section of circulation 1 is moved to right, by that analogy, M sections of ring shift rights M-1.
5. the drop amount of calculation deblurring processing method that XFAST is captured in a kind of satellite navigation according to claim 1, it is special Levy and be：Step 4) in receive code FFT result of calculations and process is caught at the beginning of XFAST obtained.
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