CN106842252A - A kind of detection method of the relevant joint acquisition subcode based on delay multiplication - Google Patents
A kind of detection method of the relevant joint acquisition subcode based on delay multiplication Download PDFInfo
- Publication number
- CN106842252A CN106842252A CN201611259215.0A CN201611259215A CN106842252A CN 106842252 A CN106842252 A CN 106842252A CN 201611259215 A CN201611259215 A CN 201611259215A CN 106842252 A CN106842252 A CN 106842252A
- Authority
- CN
- China
- Prior art keywords
- subcode
- sequence
- dif
- navigation message
- acquisition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Abstract
A kind of detection method of the relevant joint acquisition subcode based on delay multiplication, its step is as follows:Step one：Binary channels joint primary key capture；Step 2：Obtain the relational sequence r of subcode and navigation messages[k]；Step 3：The relational sequence delay multiplication of subcode and navigation message obtains xdif[k]；Step 4：Local sequence delays are multiplied and obtain ydif[k], and calculate xdif[k] and ydifThe relevant peaks of [k]；By above step, the present invention realizes the primary key and subcode of the relevant joint acquisition New System signal of binary channels, the effect of automatic bit synchronization, solves the problems, such as that single channel catching method capacity usage ratio is low, and realizes and possess the subcode phase-detection function of binary channels capture.
Description
Technical field
The present invention provides a kind of detection method of the relevant joint acquisition subcode based on delay multiplication, belongs to signal transacting skill
Art field.
Background technology
Subcode is captured as using Big Dipper New System signal framing important process step.It is that receiver obtains New System signal
The thick phase value of subcode, to carry out the steps necessary of subcode tracking.New System Beidou satellite navigation signal has data pilot double
Passage, layering code characteristic, introduce the subcode of slow frequency on the basis of original spreading code, widen a yard cycle, resist with more excellent
Arrowband interference performance and cross correlation energy, the motor synchronizing function of navigation message can be realized using the phase information of subcode, without list
Only bit synchronization circuit；Using data pilot channel structure, pilot channel coherent integration time is not limited by navigation message
System, can be tracked using pure phaselocked loop, have phase measurement accuracy higher than Costas loop.The more traditional letter of New System signal
For number, with more excellent navigation performance, meanwhile, new problem is also proposed to existing receiver, such as subcode accelerates symbol jump
The speed of change, makes coherent integration time further be limited to the single primary key cycle, and capture is changed into three-dimensional search from two-dimensional search,
The capture of pseudo-code phase includes primary key, two levels of subcode.Continuing to use single pass method for acquiring pseudo code can cause the signal of half
Energy dissipation, capacity usage ratio is low.
The content of the invention
(1) purpose of invention
It is an object of the invention to provide a kind of detection method of the relevant joint acquisition subcode based on delay multiplication, it can
The subcode capture of New System Beidou navigation signal is solved the problems, such as, and the function of automatic bit synchronization can be realized, peel off layering code
After can obtain effective navigation message data.
(2) technical scheme
To achieve the above object, a kind of detection method of the relevant joint acquisition subcode based on delay multiplication of the present invention, its
Step is as follows:
Step one：Binary channels joint primary key capture；
Step 2：Obtain the relational sequence r of subcode and navigation messages[k]；
Step 3：The relational sequence delay multiplication of subcode and navigation message obtains xdif[k]；
Step 4：Local sequence delays are multiplied and obtain ydif[k], and calculate xdif[k] and ydifThe relevant peaks of [k]；
Wherein, " capture of binary channels joint primary key " described in step one, its practice is as follows：
By if signal sampling sequence respectively with I roads and Q roads carrier multiplication, carry out down coversion；Then by down coversion sequence
Carried out to the local sequence of Plus passages and Minus passages related, the correlation peak for taking Plus passages and Minus passages is compared
Compared with obtaining larger value as judgment variables；Judgment variables are more than default detection threshold, represent primary key phase and capturing frequency deviation
Success.
Wherein, " obtaining subcode and navigation message relational sequence " described in step 2, its practice is as follows：
If the correlation peak of Plus passages is bigger than Minus, then it represents that SD" [k]=SP' [k], remembers rs[k]=1, if
The correlation peak of Plus passages is smaller than Minus, then it represents that SD" [k]=- SP' [k], remembers rs[k]=- 1；I.e.：
rs[k]=SD″[k]SP' [k]=D [k] SD′[k]SP′[k]
Wherein, " the relational sequence delay multiplication of subcode and navigation message " described in step 3, its practice is as follows：
By subcode and navigation message relational sequence rs[k] postpones m sampled point, the delayed sequence r of acquisitionsThe conjugation of [k-m]
With rs[k] is multiplied, and obtains removing the sample sequence x of navigation message influencedif[k]。
Described subcode and the relational sequence delay multiplication step of navigation message, due to rs[k] is sequence of real numbers, rs[k-m]
Conjugate it is equal with itself, can obtain xdif[k] removes the effect of navigation message：
rs_L[k]=SD[k]SP[k]
Wherein, D [k] is to receive the navigation message sequence component in signal sequence, SD[k]、SP[k] is represented receive letter respectively
Data channel subcode and pilot channel subcode composition in number sequence.Because delay sampling point m correspondence time delays relatively navigate electricity
Literary numeric data code width is smaller, therefore, the Differential Input sequence after delay multiplication can be approximately considered to navigation message numeric data code D [k]
Square operation, D [k] D [k-m] ≈ 1, so as to the saltus step for eliminating navigation message numeric data code influences are carried out.
Wherein, described in step 4 " local sequence delays are multiplied and obtain ydif[k], and calculate xdif[k] and ydif[k]
Relevant peaks ", its practice is as follows：
By local sequence rs_L[k] postpones m sampled point, the delayed sequence r of acquisitions_L[k-m] and rs_L[k] is multiplied, and obtains
Local difference sequence ydif[k]。
ydif[k]=rs_L[k]rs_L[k-m]
X is calculated using parallel phase acquisition algorithmdif[k] and ydifThe correlation of [k], if correlation peak is more than pre- gating
Limit, that is, complete subcode acquisition procedure.
By above step, the present invention realizes the primary key and subcode of the relevant joint acquisition New System signal of binary channels, automatically
The effect of bit synchronization, solves the problems, such as that single channel catching method capacity usage ratio is low, and realizes and possess binary channels and catch
The subcode phase-detection function of obtaining.
(3) advantage and effect
Based on above-mentioned steps, the relevant joint acquisition subcode detection method based on delay multiplication of the invention can reach following
Purpose：
One：Realize the subcode phase-detection function of binary channels capture.
Two：Improved relevant joint acquisition algorithm and subcode detection method have capacity usage ratio and dynamic higher higher
Performance.
Three：Subcode detection is using the parallel pseudo-code detection algorithm based on FFT, and algorithm complex is relatively low.
Four：Algorithm is applied to the different situation of data pilot passage subcode length.
In a word, the present invention can solve the problem that navigation downstream signal reception in, binary channels capture subcode phase-detection problem.Should
Invention capacity usage ratio and dynamic property is higher, algorithm complex is relatively low, it is adaptable to which data pilot passage subcode length is different
Situation, the capture to actual navigation signal is received with good performance.
Brief description of the drawings
Fig. 1 is the flow chart of the method for the invention.
Fig. 2 be binary channels be concerned with joint primary key capture system block diagram.
Fig. 3 is the system block diagram of the relevant joint acquisition subcode detection method of delay multiplication.
Fig. 4 is the relevant peaks of the subcode relation difference sequence obtained using the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings with specific embodiment to a kind of relevant joint acquisition subcode based on delay multiplication of the invention
Detection method is further introduced.
As shown in figure 1, a kind of detection method of the relevant joint acquisition subcode based on delay multiplication of the present invention, its specific reality
Apply step as follows：
The first step：The relevant joint primary key capture of binary channels；
The relevant joint primary key catching method system block diagram of binary channels is as shown in Fig. 2 by if signal sampling sequence rIF[n]
Respectively with I roads and Q roads carrier multiplication, down coversion sequence i [n]+jq [n] is obtained；Then by down coversion sequence and Plus passages and
The local signal of Minus passages carries out correlation, and the correlation peak for taking Plus passages and Minus passages is compared, and obtains larger
Value as judgment variables；Judgment variables are more than default detection threshold, represent primary key phase and capturing frequency deviation success.
Receiver front end is adjusted by radiofrequency signal, down coversion mixing, after intermediate-freuqncy signal filter and amplification and digital-to-analogue conversion, suddenly
Slightly the if signal sampling sequence that obtains of quantization error is：
Wherein,
FIF=fIF+fd
ED' [n]=D ' [n] SD′[n]CD′[n]
=SD″[n]SD′[n]
EP' [n]=SP′[n]CP′[n]
fIFIt is the IF-FRE of receiver, Di′[n]、SD,i′[n]、CD,i′[n]、SP,i′[n]、CP,i' [n] is respectively process
The navigation message numeric data code of digital front-end filtering, data channel subcode, data channel primary key, pilot channel subcode, pilot channel
Primary key sample sequence, ηIF[n] is the mid-frequency noise component by down coversion and filtering.
rIF[n] and I roads and Q roads carrier multiplication, the down coversion sequence for obtaining：
Calculate i [n]+jq [n] and be respectively R with the correlated results of Plus and Minus passages+(F0, Δ τ) and R-(F0,Δτ)：
Wherein, RD() is the auto-correlation function of data channel primary key, RP() is the auto-correlation letter of pilot channel primary key
Number.Because a primary key cycle subcode chip value is constant, subcode uses k as timing sequential, at intervals of a primary key cycle,
TcohIt is coherent integration time.ηIAnd ηQIt is ηIFGaussian random variable after coherent integration treatment, variance is equal and separate,
Due to a total TcohfsIndividual sampled point, has after normalization：
Because data channel and pilot channel primary key have identical bit rate and pseudo- code length, therefore R can be approximately consideredD
(Δτ)≈RP(Δ τ)=R (Δ τ), to two correlated results modulus sides of passage, removal carrier phase difference influence is obtained：
The peak value for taking Plus passages and Minus passages is compared, and obtains larger value as judgment variables S (F0,Δ
τ), i.e.,：
S(F0, Δ τ) and=max { S+(F0,Δτ),S-(F0,Δτ)}
As S (F0, Δ τ) more than default detection threshold when, represent primary key phase and frequency deviation acquisition success.
Second step：Obtain the relational sequence r of subcode and navigation messages[k]；
The correlated results of the Plus and Minus passages for obtaining according to the first step,
If understanding, the correlation peak of Plus passages is bigger than Minus, then it represents that SD" [k]=SP' [k], remember rs[k]=1,
If the correlation peak of Plus passages is smaller than Minus, then it represents that SD" [k]=- SP' [k], remember rs[k]=- 1.I.e.：
rs[k]=SD″[k]SP' [k]=D [k] SD′[k]SP′[k]
The r for obtainings[k] is the relational sequence of subcode and navigation message.
3rd step：rs[k] delay multiplication obtains xdif[k]；
By subcode and navigation message relational sequence rs[k] postpones m sampled point, the delayed sequence r of acquisitionsThe conjugation of [k-m]
With rs[k] is multiplied, due to rs[k] is sequence of real numbers, rsThe conjugate of [k-m] is identical with itself, i.e.,：
rs_L[k]=SD[k]SP[k]
Wherein, D [k] is to receive the navigation message sequence component in signal sequence, SD[k]、SP[k] is represented receive letter respectively
Data channel subcode and pilot channel subcode composition in number sequence.Because delay sampling point m correspondence time delays relatively navigate electricity
Literary numeric data code width is smaller, therefore, the Differential Input sequence after delay multiplication can be approximately considered to navigation message numeric data code D [k]
Square operation, D [k] D [k-m] ≈ 1, so as to the saltus step for eliminating navigation message numeric data code influences are carried out.
4th step：Local sequence delays are multiplied and obtain ydif[k], and computing relay；
By local sequence rs_L[k] postpones m sampled point, the delayed sequence r of acquisitions_L[k-m] and rs_L[k] is multiplied, and obtains
Local difference sequence ydif[k]：
ydif[k]=rs_L[k]rs_L[k-m]
The system block diagram of delay multiplication subcode signal capture is as shown in figure 3, the present invention catching using parallel code phase search
Obtain method.Specific implementation process is as follows：To xdif[k] carries out FFT, and and ydifThe conjugate multiplication of the FFT of [k], to multiplying for obtaining
Product carries out IFFT, you can obtain under conditions of same Doppler frequency shift, the correlation that 2046 code phase search are obtained.I.e.
Wherein R (n) is the correlation that n-th code phase search is calculated.
Relevant peaks are compared with pre-determined threshold, if being more than threshold value, that is, subcode capture is completed.
Validity, reasonability, feasibility and the science of algorithm are proposed for checking this patent, new body is captured using this method
The primary key and subcode of signal processed.Fig. 4 (a) and Fig. 4 (b) are using the self correlated peak and mutually of delay multiplication subcode signal of the invention
Relevant peaks.Each parameter setting is as follows in experiment：Sample frequency fs=20MHz, bit rate fc=5.115MHz, BIF=fs/ 2=
10MHz, IF-FRE fIF=10MHz, primary key a length of 5115, subcode a length of 100, carrier-to-noise ratio is 35dB/Hz, coherent integration time
It is 1ms, frequency search interval 500Hz, Doppler shift scope is -10~10kHz.
By result of the test as can be seen that this paper algorithms can effectively capture the subcode of navigation signal；By Fig. 4 (a) and Fig. 4
B () is as can be seen that postpone the self correlated peak of subcode apparently higher than the correlation of local signal and noise, and postpones signal is mutual
Pass value is far below autocorrelation value, i.e., the method for setting thresholding can be utilized to realize subcode capturing function.
Claims (5)
1. a kind of detection method of the relevant joint acquisition subcode based on delay multiplication, it is characterised in that：Its step is as follows:
Step one：Binary channels joint primary key capture；
Step 2：Obtain the relational sequence r of subcode and navigation messages[k]；
Step 3：The relational sequence delay multiplication of subcode and navigation message obtains xdif[k]；
Step 4：Local sequence delays are multiplied and obtain ydif[k], and calculate xdif[k] and ydifThe relevant peaks of [k]；
By above step, the primary key and subcode of the relevant joint acquisition New System signal of binary channels are realized, automatic bit synchronization
Effect, solves the problems, such as that single channel catching method capacity usage ratio is low, and realizes and possess the subcode of binary channels capture
Phase-detection function.
2. a kind of detection method of relevant joint acquisition subcode based on delay multiplication according to claim 1, its feature
It is：" capture of binary channels joint primary key " described in step one, its practice is as follows：
By if signal sampling sequence respectively with I roads and Q roads carrier multiplication, carry out down coversion；Then by down coversion sequence with
Plus passages carry out related to the local sequence of Minus passages, and the correlation peak for taking Plus passages and Minus passages is compared
Compared with obtaining big value as judgment variables；Judgment variables are more than default detection threshold, represent primary key phase and capturing frequency deviation into
Work(.
3. a kind of detection method of relevant joint acquisition subcode based on delay multiplication according to claim 1, its feature
It is：" obtaining subcode and navigation message relational sequence " described in step 2, its practice is as follows：
If the correlation peak of Plus passages is bigger than Minus, then it represents that SD" [k]=SP' [k], remembers rs[k]=1, if Plus is logical
The correlation peak in road is smaller than Minus, then it represents that SD" [k]=- SP' [k], remembers rs[k]=- 1；
I.e.：
rs[k]=SD″[k]SP' [k]=D [k] SD′[k]SP′[k]。
4. a kind of detection method of relevant joint acquisition subcode based on delay multiplication according to claim 1, its feature
It is：" the relational sequence delay multiplication of subcode and navigation message " described in step 3, its practice is as follows：
By subcode and navigation message relational sequence rs[k] postpones m sampled point, the delayed sequence r of acquisitionsThe conjugation and r of [k-m]s
[k] is multiplied, and obtains removing the sample sequence x of navigation message influencedif[k]；
Described subcode and the relational sequence delay multiplication step of navigation message, due to rs[k] is sequence of real numbers, rs[k-m's] is total to
Yoke value is equal with itself, obtains xdif[k] removes the effect of navigation message：
rs_L[k]=SD[k]SP[k]
Wherein, D [k] is to receive the navigation message sequence component in signal sequence, SD[k]、SP[k] is represented receive signal sequence respectively
Data channel subcode and pilot channel subcode composition in row；Because delay sampling point m correspondence time delays are compared with navigation message number
It is small according to code width, therefore, the Differential Input sequence after delay multiplication is approximately considered to be carried out to navigation message numeric data code D [k]
Square operation, D [k] D [k-m] ≈ 1, so as to the saltus step for eliminating navigation message numeric data code influences.
5. a kind of detection method of relevant joint acquisition subcode based on delay multiplication according to claim 1, its feature
It is：Described in step 4 " local sequence delays are multiplied and obtain ydif[k], and calculate xdif[k] and ydifThe correlation of [k]
Peak ", its practice is as follows：
By local sequence rs_L[k] postpones m sampled point, the delayed sequence r of acquisitions_L[k-m] and rs_L[k] is multiplied, and obtains local
Difference sequence ydif[k]；
ydif[k]=rs_L[k]rs_L[k-m]
X is calculated using parallel phase acquisition algorithmdif[k] and ydifThe correlation of [k], if correlation peak is more than pre-determined threshold,
Complete subcode acquisition procedure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611259215.0A CN106842252A (en) | 2016-12-30 | 2016-12-30 | A kind of detection method of the relevant joint acquisition subcode based on delay multiplication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611259215.0A CN106842252A (en) | 2016-12-30 | 2016-12-30 | A kind of detection method of the relevant joint acquisition subcode based on delay multiplication |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106842252A true CN106842252A (en) | 2017-06-13 |
Family
ID=59115013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611259215.0A Pending CN106842252A (en) | 2016-12-30 | 2016-12-30 | A kind of detection method of the relevant joint acquisition subcode based on delay multiplication |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106842252A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358349A (en) * | 2018-09-17 | 2019-02-19 | 西安开阳微电子有限公司 | A kind of satellite signal tracking method and device |
| CN110943758A (en) * | 2019-11-12 | 2020-03-31 | 天津津航计算技术研究所 | Secondary capturing method based on Doppler frequency change frequency and frequency joint search |
| CN111158017A (en) * | 2019-12-31 | 2020-05-15 | 西安航天华迅科技有限公司 | Method for synchronizing pilot component auxiliary data component of L1C/B1C navigation signal |
| CN112600784A (en) * | 2020-11-23 | 2021-04-02 | 中国电子科技集团公司第二十研究所 | Large frequency offset bit synchronization method based on quadratic differential correlation |
| CN114063124A (en) * | 2021-11-08 | 2022-02-18 | 北京航空航天大学合肥创新研究院(北京航空航天大学合肥研究生院) | Beidou B1C signal rapid capturing method and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279402A (en) * | 2011-03-18 | 2011-12-14 | 哈尔滨工业大学 | Frequency domain coherent joint capture method of GNSS data/pilot mixed signal |
| CN103199887A (en) * | 2013-03-11 | 2013-07-10 | 北京航空航天大学 | General capture method applied to direct spread spectrum signal |
| CN103364802A (en) * | 2013-07-12 | 2013-10-23 | 北京大学 | TDDM spread spectrum navigation signal capturing method based on two-channel combined utilization |
| CN105141340A (en) * | 2015-07-24 | 2015-12-09 | 南京理工大学 | Full-digital receiving method of direct spread MSK signal |
-
2016
- 2016-12-30 CN CN201611259215.0A patent/CN106842252A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279402A (en) * | 2011-03-18 | 2011-12-14 | 哈尔滨工业大学 | Frequency domain coherent joint capture method of GNSS data/pilot mixed signal |
| CN103199887A (en) * | 2013-03-11 | 2013-07-10 | 北京航空航天大学 | General capture method applied to direct spread spectrum signal |
| CN103364802A (en) * | 2013-07-12 | 2013-10-23 | 北京大学 | TDDM spread spectrum navigation signal capturing method based on two-channel combined utilization |
| CN105141340A (en) * | 2015-07-24 | 2015-12-09 | 南京理工大学 | Full-digital receiving method of direct spread MSK signal |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358349A (en) * | 2018-09-17 | 2019-02-19 | 西安开阳微电子有限公司 | A kind of satellite signal tracking method and device |
| CN109358349B (en) * | 2018-09-17 | 2023-05-09 | 西安开阳微电子有限公司 | Satellite signal capturing method and device |
| CN110943758A (en) * | 2019-11-12 | 2020-03-31 | 天津津航计算技术研究所 | Secondary capturing method based on Doppler frequency change frequency and frequency joint search |
| CN111158017A (en) * | 2019-12-31 | 2020-05-15 | 西安航天华迅科技有限公司 | Method for synchronizing pilot component auxiliary data component of L1C/B1C navigation signal |
| CN111158017B (en) * | 2019-12-31 | 2023-06-23 | 上海星思半导体有限责任公司 | Method for assisting in synchronizing data components of pilot frequency components of L1C/B1C navigation signals |
| CN112600784A (en) * | 2020-11-23 | 2021-04-02 | 中国电子科技集团公司第二十研究所 | Large frequency offset bit synchronization method based on quadratic differential correlation |
| CN114063124A (en) * | 2021-11-08 | 2022-02-18 | 北京航空航天大学合肥创新研究院(北京航空航天大学合肥研究生院) | Beidou B1C signal rapid capturing method and storage medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106842252A (en) | A kind of detection method of the relevant joint acquisition subcode based on delay multiplication | |
| CN104536016B (en) | GNSS new-system signal capturing device and method | |
| CN104852876B (en) | A kind of aviation wireless burst communication system | |
| CN104570017B (en) | Avoiding and stripping method for Neumann-Hoffman codes in navigation messages of Beidou navigation satellite system D1 | |
| CN105790788B (en) | A kind of pseudo-code of direct expansion msk signal-Doppler's joint acquisition method | |
| CN109088838B (en) | Pseudo code-Doppler fast capturing method of direct sequence spread spectrum DPSK signal under high dynamic condition | |
| CN105607096A (en) | Dual-satellite time difference and frequency difference positioning method and positioning device | |
| CN109412644B (en) | Doppler frequency estimation method for direct sequence spread spectrum MSK signal | |
| CN103630916B (en) | Code capturing method based on dual-FFT frequency domain filtering | |
| CN103364802A (en) | TDDM spread spectrum navigation signal capturing method based on two-channel combined utilization | |
| CN101764780A (en) | Method and system for time and frequency synchronization in orthogonal frequency division multiplexing | |
| CN107493117A (en) | The two-dimentional joint acquisition method of DS msk signal under a kind of high dynamic | |
| CN102571652A (en) | Method for estimating global navigation satellite system (GNSS) baseband signal | |
| CN103439718B (en) | Unambiguous tracking unit of high-order BOC modulation signals | |
| CN104215979A (en) | Large frequency shift GNSS signal capture method based on segmented correlative combination and FFT computation | |
| CN102243309B (en) | GNSS cross-correlation interferences suppressing method and device | |
| CN104459734A (en) | Beidou satellite navigation signal capturing method based on NH code element jumping detection | |
| CN107370705A (en) | FFT optimization method in the capture of high dynamic weakly continuous phase modulated signal | |
| CN107247276A (en) | Weak signal catching method based on overlapping polylith zero padding algorithm | |
| CN103941269A (en) | PN code capturing method used for satellite navigation system | |
| CN103760578B (en) | A kind of GNSS satellite navigation signal without fuzzy tracking method | |
| CN105445767B (en) | BOC signal parameter blind estimating methods based on average Ambiguity Function | |
| CN101072045A (en) | Short-period spreading code time frequency parallel searching method based on frequency folding | |
| CN101063717B (en) | Method for capturing GPS signal with FFT | |
| CN101242390B (en) | Carrier frequency deviation estimation algorithm based on known sequence interference self-association |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20170613 |