CN108051827A - BOC modulated signals are without fuzzy code tracking method - Google Patents
BOC modulated signals are without fuzzy code tracking method Download PDFInfo
- Publication number
- CN108051827A CN108051827A CN201711008738.2A CN201711008738A CN108051827A CN 108051827 A CN108051827 A CN 108051827A CN 201711008738 A CN201711008738 A CN 201711008738A CN 108051827 A CN108051827 A CN 108051827A
- Authority
- CN
- China
- Prior art keywords
- mrow
- msub
- boc
- code
- msubsup
- 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
- G01S19/23—Testing, monitoring, correcting or calibrating of receiver elements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
- G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
Abstract
A kind of BOC modulated signals disclosed by the invention are without fuzzy code tracking method, it is desirable to provide it is a kind of it is simple easily realize, the high BOC modulated signals of tracking accuracy without fuzzy code tracking method, the technical scheme is that：First, increasing orthogonal BOC modulated signals all the way the code tracking loop more, the BOC modulated signals locally reappeared and corresponding orthogonal BOC modulated signals are generated in code tracking loop；Related operation is carried out with the BOC modulated signals received respectively according to the above-mentioned two groups of modulated signals locally reappeared, obtains two groups of correlation output values of I, Q；New correlation function is reconstructed further according to two groups of obtained correlations, eliminates the side peak of BOC modulated signal auto-correlation functions；Finally, select and subtract hysteresis code phase discriminator in advance processing output phase demodulation value is carried out to reconstruct correlation function, then via loop filter and code numerically-controlled oscillator NCO, progressively adjust the code phase that local code generator generates, realize BOC modulated signals without fuzzy tracking.
Description
Technical field
The present invention relates to a kind of simultaneous techniques fields that can be applied to new generation satellite navigation signal, can be used for satellite
Navigation such as is accurately positioned, measures at the technical fields, suitable for various phases and exponent number and various types binary offset carrier
(Binary Offset Carrier--BOC) modulated signal is without fuzzy code tracking loop design method.
Background technology
BOC modulation is a kind of new modulation system proposed with airmanship development need.BOC modulation is by GPS
In (Global Positioning System) Modernization Signal design group Betz lead modulation and capture design group in
It proposes within 1999.The modern times of GNSS (Global Navigation Satellite System, Global Navigation Satellite System)
To change and build, Satellite Navigation Technique is increasingly paid attention in countries in the world, wherein, with new generation satellite navigation signal-BOC modulation letters
It is number of greatest concern.With the continuous development of Global Navigation Satellite System, how in extremely limited navigation frequency range resource is realized
The shared and more accurate code tracking result of acquisition becomes the hot issue of GNSS designs.BOC modulates the frequency spectrum for realizing signal
Separation, can make now with signal share frequency band, and with than BPSK (Binary Phase Shift Key) modulation more
Good performance has the higher code tracking performance of precision and higher multi-path resolved ability, can also improve the anti-interference energy of signal
Power improves the positioning accuracy of system.Therefore, BOC modulated signals have been widely used in GPS, Galileo and BDs (north
Bucket) etc. in Global Satellite Navigation System, significantly increase tracking accuracy and multipaths restraint performance.Although BOC modulation has division
Frequency spectrum and relatively narrow correlation function (auto-correlation function, ACF) main peak, but BOC modulated signal correlation functions
Multi-peaks structure, correlation function is very complicated, and peak is relatively narrow, in addition the influence of noise and multipath, on easy error trap to side peak, increases
Added the difficulty of capture and tracking, Bian Feng causes signal during acquisition and tracking there may be fuzziness, cause it is very big with
Track error causes the reduction of signal trace precision.Tracking fuzzy problem is prevalent in all BOC classes modulated signals, is GNSS
One of hot issue of field of signal processing research.
Code tracking loop is usually to be made of phase discriminator, loop filter and local code signal generator.Traditional navigation
Code tracking loop (Delay Lock Loop--DLL) is realized by the main peak of the auto-correlation function of locking signal in receiver
To the acquisition and tracking of pseudo noise (Pseudo Random Noise--PRN) code, but since BOC modulated signals are from phase
Closing function has 1 main peak and multiple side peaks, and the quantity of relevant peaks can also increase with the increase of order of modulation.When using
When traditional DLL is captured and tracked to BOC modulated signals, due to the effect of noise, auto-correlation function may be locked in
Side peak on, the captures of BOC modulated signals and track band are come difficult, occur larger tracking error so as to cause DLL, drawn
The pseudo-range measurements entered also will be very big, this is exactly the tracking fuzzy problem of BOC signals.
In order to preferably solve this problem, some were also proposed without fuzzy tracking side for BOC modulated signals in recent years
Method.Betz proposes that VNELP signal trace methods are exactly to improve the detection probability of main peak to sacrifice hardware resource, is equally with sacrificial
Domestic animal resource is " Bump and Jump " (peak jump method) algorithm of cost, even more ensures the locking of main peak with 5 correlators,
The principle of Bump-Jump methods is corrected immediately once false-lock is found, therefore it is a kind of false-lock recovery device that it, which should become, this
Kind method is very high to the shape need of auto-correlation function, and correlation function distortion caused by multipath and filtering can cause it serious
It influences.BPSK-like methods merely with BOC modulated signals a frequency band or it is incoherent merging two Sideband processings
Result afterwards obtains the relevant peaks received similar to BPSK, so as to solving the problems, such as that BOC modulates fuzziness, but BPSK-like
The hardware spending of correlator is added, and it is not high to BOC modulated signal tracking accuracies, and there is no playing, BOC modulation is high-precision
The advantage of measurement is spent, precision is sacrificed more serious.Julien et al. proposes a kind of autocorrelation sidelobe technology for eliminating
(autocorrelation side-peak cancellation technique--ASPeCT), the technology is in code tracking loop
In code generator in generate BOC reproduction signals and PRN signal respectively, carry out related operation respectively at the BOC signals received,
It is poor to be made again with BOC auto-correlation functions with BOC/PRN cross-correlation functions, so as to eliminate the side peak of BOC auto-correlation functions, solves BOC
The fuzzy problem of signal trace, but this method is only applicable to BOC (n, n) signal.Yao etc. has again been done into one ASPeCT algorithms
The popularization of step, it is proposed that GRASS (General Removing Ambiguity via Side peak Suppression) is calculated
Method, the nothing that can solve general BOC (kn, n) obscure Trapped problems.Hodgart M S et al. propose bicyclic method of estimation,
This method needs DLL and subcarrier to track ring respectively to code phase and sub-carrier phase into line trace, is modulated so as to fulfill to BOC
Signal without fuzzy tracking.
The content of the invention
It is obscured caused by being tracked the purpose of the present invention is the multimodal for BOC modulated signal auto-correlation functions to signal capture
Degree problem provides a kind of simple easily realization, and the high BOC modulated signals of tracking accuracy are without fuzzy code tracking method.
Technical solution is used by the present invention solves prior art problem：A kind of BOC modulated signals are without fuzzy code tracking
Method, it is characterised in that include the following steps：First, the generation being connected all the way with carrier frequency mixing device is increased in code tracking loop
The local code generator of orthogonal binary offset carrier BOC modulated signals, receiver according to the BOC modulated signals received,
The BOC modulated signals locally reappeared are generated in code tracking loop and corresponding orthogonal BOC modulated signals, receiver radio frequency channel are defeated
The intermediate-freuqncy signal gone out enters in receiver code track loop, is mixed to obtain two branch BOC base band letters of I, Q through carrier frequency mixing device
Number；Receiver distinguishes the BOC baseband signals received in input integral-remover with the two groups of signals locally reappeared, carries out
Related operation obtains two groups of correlation function output valves of I, Q；Then by code phase discriminator by the correlation function value that I, Q branch obtain into
Row reconstruct, obtains the new auto-correlation function for eliminating BOC modulated signals side peak；Advanced subtract is selected to lag code phase discriminator counterweight again
Correlation function after structure is handled, and is exported to loop filter and code NCO (NCO-Numerically Controlled
Oscillator), the code phase of local code generator generation is progressively adjusted by loop filter and code NCO, finally realizes BOC
Modulated signal without fuzzy tracking.
The present invention has the advantages that compared with the prior art：
It is simple easily to realize.The present invention is by locally generated BOC signals and orthogonal BOC signals in code tracking loop, and with connecing
The BOC signals received carry out related operation, obtain new correlation function by reconstruct, eliminate BOC modulated signal auto-correlation letters
Several side peaks can realize BOC signals without fuzzy tracking.Orthogonal BOC modulation letter all the way is only added to traditional code tracking loop more
Number, and pair correlation function is reconstructed, and the extra side peak of BOC modulated signals is eliminated, for Sine-BOC and Cosine-BOC tune
Signal processed is applicable in, and simple easily realization.
Tracking accuracy is high.The fuzzy problem that the present invention occurs for BOC signals during acquisition and tracking, according to reception
The BOC modulated signal forms arrived generate the BOC modulated signals locally reappeared and corresponding orthogonal BOC tune in code tracking loop
Signal processed；Then according to the above-mentioned two groups of modulated signals locally reappeared the related fortune of BOC modulated signals progress to receiving respectively
It calculates, obtains two groups of correlation output values of I, Q；New correlation function is reconstructed further according to two groups of obtained correlations, eliminates BOC modulation letters
The side peak of number auto-correlation function；Reach eliminate BOC modulated signal auto-correlation functions side peak, realize BOC modulated signals without mould
Paste tracking.The advantages of retaining BOC modulated signals to greatest extent, and the sharp main peak of its auto-correlation function is remained, so as to
It ensure that its preferable tracking accuracy, calculation amount smaller, and deblurring effect is good.
Description of the drawings
The present invention is further described with reference to the accompanying drawings and examples.
Fig. 1 is BOC modulated signals of the present invention without Fuzzy Codes trace flow figure.
Fig. 2 is BOC modulated signals of the present invention without fuzzy code tracking loop schematic diagram.
Specific embodiment
With reference to Fig. 1.According to the present invention, first, the generation being connected all the way with carrier frequency mixing device is increased in code tracking loop
The local code generator of orthogonal binary offset carrier BOC modulated signals, receiver according to the BOC modulated signals received,
The BOC modulated signals locally reappeared are generated in code tracking loop and corresponding orthogonal BOC modulated signals, receiver radio frequency channel are defeated
The intermediate-freuqncy signal gone out enters in receiver code track loop, is mixed to obtain two branch BOC base band letters of I, Q through carrier frequency mixing device
Number；Receiver distinguishes the BOC baseband signals received in input integral-remover with the two groups of signals locally reappeared, carries out
Related operation obtains two groups of correlation function output valves of I, Q；Then by code phase discriminator by the correlation function value that I, Q branch obtain into
Row reconstruct, obtains the new auto-correlation function for eliminating BOC modulated signals side peak；Advanced subtract is selected to lag code phase discriminator counterweight again
Correlation function after structure is handled, and is exported to loop filter and code NCO, is progressively adjusted by loop filter and code NCO
The code phase that whole local code generator generates, it is final realize BOC modulated signals without fuzzy tracking.
With reference to Fig. 2.BOC modulated signals without fuzzy code tracking loop include be sequentially connected local code generator, code NCO,
Loop filter and code phase discriminator, symmetric parallel above-mentioned local code generator input terminal multiplier and to be connected on multiplier defeated
Enter the carrier frequency mixing device at end, carrier frequency mixing device is connected carrier wave NCO, and symmetrical carrier frequency mixing device passes through at least four symmetric multiplications respectively
Device string formation joins at least four symmetric integrals-remover group, and symmetric integral-remover group parallel connection code phase discriminator forms BOC modulation letters
Number without fuzzy code tracking loop.In BOC modulated signals without in fuzzy code tracking loop,
(1) receiver is according to the BOC modulated signals received, generated in code tracking loop BOC modulated signals with it is corresponding just
BOC modulated signals are handed over, the intermediate-freuqncy signal of receiver radio frequency channel output enters in receiver code track loop, through carrier frequency mixing device
Mixing obtains the BOC baseband signal S (t) of two branch plural forms of I, Q：
In formula, t is random time；E be the natural number truth of a matter, e-jθFor complex exponential, j is the imaginary part of complex exponential, and θ is carrier phase
Initial delay；aKBe it is data-modulated after spreading code, K be k-th chip period；Spread spectrum symbolIt is the duration to be
NTsRectangular pulse, N be BOC order of modulation, TsFor time half period of subcarrier, t0It is the initial phase of signal；SubcarrierIt is 2T for the cyclesPeriodic function.Spreading code aKThe phase symbol that can be chosen is { 1, -1 }；BOC order of modulation N is one
A spread spectrum symbol duration and the ratio of half period subcarrier, and N=2fsfc=TcTs, wherein, fsFor subcarrier frequency,
fcFor spread-spectrum code rate, TcFor spreading code cycle, fc=1Tc。
I, the BOC baseband signal S (t) of two branch plural forms of Q are mixed by carrier frequency mixing device, are distinguished through carrier wave NCO
It is sent into symmetric integral-remover group and code generator, the local PRN code in code generator passes through multiplier and code generator respectively
The subcarrier of generation and the subcarrier of offset pi 2 are modulated, reproduction generation BOC signals x1(t) with orthogonal BOC modulated signals x2
(t), wherein,
In formula, ci∈ { -1,1 } is i-th of chip of PRN code, and i is number of chips；Spread spectrum symbolIt is NT the duration to bes
Rectangular pulse；N be BOC modulated signals order of modulation, TsFor time half period of subcarrier；sign(sin(2πfsT)) refer to
Sinusoidal sign function, sign (cos (2 π fsT) it is) cosine sign function, fsFor subcarrier frequency, and fs=1/2Ts。
(2) the two groups of signals locally reappeared respectively with receiver receive BOC baseband signals input integral-remover in into
Row related operation obtains the correlation function output valve of I, Q branch.
The two paths of signals for reappearing generation carries out related operation with BOC baseband signals respectively, is input to as shown in Figure 2
It is advanced subtract the lead and lag branch in hysteresis code phase discriminator correlation function value be respectively：
In formula, τ is relative time-delay；E is advanced branch, and L is hysteresis branch；For advanced branch road receive signal with
The correlation function value of local BOC signals；Correlation function of the signal with local orthogonal BOC signals is received for advanced branch road
Value；The correlation function value of signal and local BOC signals is received for hysteresis branch road,It is received for hysteresis branch road
Signal and the correlation function value of local orthogonal signalling,Respectively the advanced branch road of I, Q receives signal and believes with local BOC
Value after number related operation；Branch road receives signal and local orthogonal BOC modulated signals phase respectively after I, Q
Close the value after computing；Respectively after I, Q hysteresis branch road reception signal and local BOC signal related operations
Value；Respectively I, Q lag branch road and receive signal and the value after local orthogonal BOC signals related operation.
(3) correlation that code phase discriminator is obtained according to two branch of I, Q reconstructs new correlation function, eliminates BOC modulated signals
The side peak of auto-correlation function.
To eliminate the side peak of BOC modulated signal auto-correlation functions, by the correlation function value that I, Q branch obtain according to formula (8)
It is reconstructed with formula (9), obtains new correlation function,
In formula,Correlation function value after being reconstructed for advanced branch；For the related letter after hysteresis branch reconstruct
Numerical value；β isWithProportionality coefficient, β can be adjusted according to the exponent number of BOC modulated signals.
(4) code phase discriminator can be selected subtracts hysteresis code phase discriminator in advance, subtracts hysteresis code phase discriminator in advance to the phase after reconstruct
It closes function and carries out processing output to loop filter and code NCO, progressively adjusted by loop filter and code NCO locally generated
Code phase, it is final realize BOC modulated signals without fuzzy tracking.
Use phase discriminator reconstruct after correlation function input subtract in advance after hysteresis phase discriminator the correlation function that exports for：
It is advanced to subtract hysteresis phase discriminator output phase demodulation valueAfterwards, progressively adjusted via loop filter and code NCO locally generated
Code phase, receiver carried out without fuzzy tracking the BOC modulated signals that receive according to the code phase after adjustment.
Claims (8)
1. a kind of BOC modulated signals are without fuzzy code tracking method, it is characterised in that include the following steps：First, in code tracking loop
The local code for increasing the generation orthogonal binary offset carrier BOC modulated signals being connected all the way with carrier frequency mixing device in road generates
Device, receiver generate the BOC modulated signals and phase locally reappeared according to the BOC modulated signals received in code tracking loop
The orthogonal BOC modulated signals answered, the intermediate-freuqncy signal of receiver radio frequency channel output enters in receiver code track loop, through carrier wave
Frequency mixer is mixed to obtain two branch BOC baseband signals of I, Q；What receiver reappeared by the BOC baseband signals received and locally
In two groups of signal difference input integral-removers, carry out related operation and obtain two groups of correlation function output valves of I, Q；Then pass through
The correlation function value that I, Q branch obtain is reconstructed code phase discriminator, obtain it is new eliminate BOC modulated signals side peak from phase
Close function；The advanced hysteresis code phase discriminator that subtracts is selected to handle the correlation function after reconstruct again, and is exported to loop filter
With code NCO, the code phase of local code generator generation is progressively adjusted by loop filter and code NCO, it is final to realize BOC modulation
Signal without fuzzy tracking.
2. BOC modulated signals as claimed in claim 2 are without fuzzy code tracking method, it is characterised in that：It is mixed through carrier frequency mixing device
Frequency obtains the BOC baseband signal S (t) of two branch plural forms of I, Q：
<mrow>
<mi>S</mi>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mi>j</mi>
<mi>&theta;</mi>
</mrow>
</msup>
<munder>
<mo>&Sigma;</mo>
<mi>K</mi>
</munder>
<msub>
<mi>a</mi>
<mi>K</mi>
</msub>
<msub>
<mi>&mu;</mi>
<mrow>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<mi>K</mi>
<mo>&CenterDot;</mo>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<msub>
<mi>C</mi>
<msub>
<mi>T</mi>
<mi>s</mi>
</msub>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<msub>
<mi>t</mi>
<mn>0</mn>
</msub>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, t is random time；E be the natural number truth of a matter, e-jθFor complex exponential, j is the imaginary part of complex exponential, and θ is carrier phase
Initial delay；aKBe it is data-modulated after spreading code, K be k-th chip period；Spread spectrum symbolIt is the duration to be
NTsRectangular pulse, N be BOC order of modulation, TsFor time half period of subcarrier, t0It is the initial phase of signal；Subcarrier
CTs(t) be the cycle be 2TsPeriodic function.
3. BOC modulated signals as claimed in claim 2 are without fuzzy code tracking method, it is characterised in that：Spreading code aKThe phase of selection
Bit sign is { 1, -1 }；BOC order of modulation N is the ratio of a spread spectrum symbol duration and half period subcarrier, and N=
2fs/fc=Tc/Ts, wherein, fsFor subcarrier frequency, fcFor spread-spectrum code rate, TcFor spreading code cycle, fc=1/Tc。
4. BOC modulated signals as described in claim 1 are without fuzzy code tracking method, it is characterised in that：I, two branch plural numbers of Q
The BOC baseband signal S (t) of form are mixed by carrier frequency mixing device, through carrier wave NCO be respectively fed to symmetric integral-remover group and
Code generator, the subcarrier and deviate pi/2 that the local PRN code in code generator is generated respectively by multiplier and code generator
Subcarrier is modulated, reproduction generation BOC signals x1(t) with orthogonal BOC modulated signals x2(t), wherein,
<mrow>
<msub>
<mi>x</mi>
<mn>1</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<munderover>
<mo>&Sigma;</mo>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mo>-</mo>
<mi>&infin;</mi>
</mrow>
<mi>&infin;</mi>
</munderover>
<msub>
<mi>c</mi>
<mi>i</mi>
</msub>
<mo>*</mo>
<msub>
<mi>&mu;</mi>
<mrow>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<mi>i</mi>
<mo>&CenterDot;</mo>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>*</mo>
<mi>s</mi>
<mi>i</mi>
<mi>g</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mo>(</mo>
<mrow>
<mn>2</mn>
<msub>
<mi>&pi;f</mi>
<mi>s</mi>
</msub>
<mi>t</mi>
</mrow>
<mo>)</mo>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>2</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>x</mi>
<mn>2</mn>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<munderover>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mo>-</mo>
<mi>&infin;</mi>
</mrow>
<mi>&infin;</mi>
</munderover>
<msub>
<mi>c</mi>
<mi>i</mi>
</msub>
<mo>*</mo>
<msub>
<mi>&mu;</mi>
<mrow>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mi>t</mi>
<mo>-</mo>
<mi>i</mi>
<mo>&CenterDot;</mo>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
<mo>)</mo>
</mrow>
<mo>*</mo>
<mi>s</mi>
<mi>i</mi>
<mi>g</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mi>s</mi>
<mi>i</mi>
<mi>n</mi>
<mo>(</mo>
<mrow>
<mn>2</mn>
<msub>
<mi>&pi;f</mi>
<mi>s</mi>
</msub>
<mi>t</mi>
<mo>-</mo>
<mi>&pi;</mi>
<mo>/</mo>
<mn>2</mn>
</mrow>
<mo>)</mo>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mo>=</mo>
<munderover>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mo>-</mo>
<mi>&infin;</mi>
</mrow>
<mi>&infin;</mi>
</munderover>
<msub>
<mi>c</mi>
<mi>i</mi>
</msub>
<mo>*</mo>
<msub>
<mi>&mu;</mi>
<mrow>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mrow>
<mi>t</mi>
<mo>-</mo>
<mi>i</mi>
<mo>&CenterDot;</mo>
<msub>
<mi>NT</mi>
<mi>s</mi>
</msub>
</mrow>
<mo>)</mo>
</mrow>
<mo>*</mo>
<mrow>
<mo>&lsqb;</mo>
<mrow>
<mo>-</mo>
<mi>s</mi>
<mi>i</mi>
<mi>g</mi>
<mi>n</mi>
<mrow>
<mo>(</mo>
<mrow>
<mi>cos</mi>
<mrow>
<mo>(</mo>
<mrow>
<mn>2</mn>
<msub>
<mi>&pi;f</mi>
<mi>s</mi>
</msub>
<mi>t</mi>
</mrow>
<mo>)</mo>
</mrow>
</mrow>
<mo>)</mo>
</mrow>
</mrow>
<mo>&rsqb;</mo>
</mrow>
</mrow>
</mtd>
</mtr>
</mtable>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>3</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, ci∈ { -1,1 } is i-th of chip of PRN code, and i is number of chips；Spread spectrum symbolIt is NT the duration to bes
Rectangular pulse；N be BOC modulated signals order of modulation, TsFor time half period of subcarrier；sign(sin(2πfsT)) refer to
Sinusoidal sign function, sign (cos (2 π fsT) it is) cosine sign function, fsFor subcarrier frequency, and fs=1/2Ts。
5. BOC modulated signals as described in claim 1 are without fuzzy code tracking method, it is characterised in that：Reappear the two-way of generation
Signal carries out related operation with BOC baseband signals respectively, obtains being input to the advanced lead and lag subtracted in hysteresis code phase discriminator
The correlation function value of branch is respectively：
<mrow>
<msubsup>
<mi>R</mi>
<mn>1</mn>
<mi>E</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>I</mi>
<mn>1</mn>
<mi>E</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>Q</mi>
<mn>1</mn>
<mi>E</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>4</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msubsup>
<mi>R</mi>
<mn>2</mn>
<mi>E</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>I</mi>
<mn>2</mn>
<mi>E</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>Q</mi>
<mn>2</mn>
<mi>E</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>5</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msubsup>
<mi>R</mi>
<mn>1</mn>
<mi>L</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>I</mi>
<mn>1</mn>
<mi>L</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>Q</mi>
<mn>1</mn>
<mi>L</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>6</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msubsup>
<mi>R</mi>
<mn>2</mn>
<mi>L</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msqrt>
<mrow>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>I</mi>
<mn>2</mn>
<mi>L</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>Q</mi>
<mn>2</mn>
<mi>L</mi>
</msubsup>
<mo>)</mo>
</mrow>
<mn>2</mn>
</msup>
</mrow>
</msqrt>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>7</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula, τ is relative time-delay；E is advanced branch, and L is hysteresis branch；For advanced branch road receive signal with
The correlation function value of local BOC signals；Correlation function of the signal with local orthogonal BOC signals is received for advanced branch road
Value；The correlation function value of signal and local BOC signals is received for hysteresis branch road,It is received for hysteresis branch road
Signal and the correlation function value of local orthogonal signalling,Respectively the advanced branch road of I, Q receives signal and believes with local BOC
Value after number related operation；Branch road receives signal and local orthogonal BOC modulated signals phase respectively after I, Q
Close the value after computing；Respectively after I, Q hysteresis branch road reception signal and local BOC signal related operations
Value；Respectively I, Q lag branch road and receive signal and the value after local orthogonal BOC signals related operation.
6. BOC modulated signals as described in claim 1 are without fuzzy code tracking method, it is characterised in that：To eliminate BOC modulation letters
The side peak of number auto-correlation function, the correlation function value that I, Q branch obtain is reconstructed, and obtaining new correlation function is,
<mrow>
<msub>
<mover>
<mi>R</mi>
<mo>~</mo>
</mover>
<mi>E</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msubsup>
<mi>R</mi>
<mn>1</mn>
<mi>E</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mi>&beta;</mi>
<mo>*</mo>
<msubsup>
<mi>R</mi>
<mn>2</mn>
<mi>E</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>8</mn>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<msub>
<mover>
<mi>R</mi>
<mo>~</mo>
</mover>
<mi>L</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msubsup>
<mi>R</mi>
<mn>1</mn>
<mi>L</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mi>&beta;</mi>
<mo>*</mo>
<msubsup>
<mi>R</mi>
<mn>2</mn>
<mi>L</mi>
</msubsup>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>9</mn>
<mo>)</mo>
</mrow>
</mrow>
In formula,Correlation function value after being reconstructed for advanced branch；For the related letter after hysteresis branch reconstruct
Numerical value；β isWithProportionality coefficient, β can be adjusted according to the exponent number of BOC modulated signals.
7. BOC modulated signals as described in claim 1 are without fuzzy code tracking method, it is characterised in that：It is reconstructed using phase discriminator
Correlation function input afterwards subtracts the correlation function exported after hysteresis phase discriminator in advance：
<mrow>
<mover>
<mi>R</mi>
<mo>&OverBar;</mo>
</mover>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>=</mo>
<msub>
<mover>
<mi>R</mi>
<mo>~</mo>
</mover>
<mi>E</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<msub>
<mover>
<mi>R</mi>
<mo>~</mo>
</mover>
<mi>L</mi>
</msub>
<mrow>
<mo>(</mo>
<mi>&tau;</mi>
<mo>)</mo>
</mrow>
<mo>-</mo>
<mo>-</mo>
<mo>-</mo>
<mrow>
<mo>(</mo>
<mn>10</mn>
<mo>)</mo>
</mrow>
</mrow>
It is advanced to subtract hysteresis phase discriminator output phase demodulation valueAfterwards, progressively adjusted via loop filter and code NCO locally generated
Code phase, receiver carried out without fuzzy tracking the BOC modulated signals that receive according to the code phase after adjustment.
8. BOC modulated signals as described in claim 1 are without fuzzy code tracking method, it is characterised in that：BOC modulated signals are without mould
Paste code tracking loop includes local code generator, code NCO, loop filter and code phase discriminator, the symmetric parallel being sequentially connected and exists
The multiplier of above-mentioned local code generator input terminal and the carrier frequency mixing device for being connected on multiplier input terminal, carrier frequency mixing device are connected
Carrier wave NCO, symmetrical carrier frequency mixing device join at least four symmetric integrals-remover by least four symmetric multiplication device string formations respectively
Group, symmetric integral-remover group parallel connection code phase discriminator form BOC modulated signals without fuzzy code tracking loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711008738.2A CN108051827A (en) | 2017-10-25 | 2017-10-25 | BOC modulated signals are without fuzzy code tracking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711008738.2A CN108051827A (en) | 2017-10-25 | 2017-10-25 | BOC modulated signals are without fuzzy code tracking method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108051827A true CN108051827A (en) | 2018-05-18 |
Family
ID=62118712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711008738.2A Pending CN108051827A (en) | 2017-10-25 | 2017-10-25 | BOC modulated signals are without fuzzy code tracking method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108051827A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108897009A (en) * | 2018-06-08 | 2018-11-27 | 桂林电子科技大学 | A kind of BOC navigation signal receiver and its code tracking method |
| CN111812684A (en) * | 2020-07-22 | 2020-10-23 | 桂林电子科技大学 | BOC signal multipath suppression technology improvement method based on autocorrelation side peak elimination |
| CN114675310A (en) * | 2022-05-30 | 2022-06-28 | 长沙金维信息技术有限公司 | Carrier half-cycle repair method and RTK integer ambiguity fixing method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7555033B2 (en) * | 2004-06-22 | 2009-06-30 | The Aerospace Corporation | Binary offset carrier M-code envelope detector |
| CN103645484A (en) * | 2013-11-29 | 2014-03-19 | 哈尔滨工程大学 | A method for processing a composite binary offset carrier modulating signal |
| CN103901446A (en) * | 2014-03-28 | 2014-07-02 | 哈尔滨工程大学 | Binary offset carrier modulation signal side peak eliminating and main peak capturing method |
| CN103926601A (en) * | 2014-04-17 | 2014-07-16 | 哈尔滨工程大学 | BOC (15, 2.5) modulation method capturing method based on combined related function |
| US20150139282A1 (en) * | 2013-10-18 | 2015-05-21 | Research & Business Foundation Sungkyunkwan University | Method for generating binary offset carrier correlation function based on local signals, apparatus for tracking binary offset carrier signal, and spread spectrum signal receiver system |
| CN106547005A (en) * | 2015-09-18 | 2017-03-29 | 北京大学 | A kind of method and device for capturing for sinusoidal binary offset carrier (boc) modulated signals |
-
2017
- 2017-10-25 CN CN201711008738.2A patent/CN108051827A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7555033B2 (en) * | 2004-06-22 | 2009-06-30 | The Aerospace Corporation | Binary offset carrier M-code envelope detector |
| US20150139282A1 (en) * | 2013-10-18 | 2015-05-21 | Research & Business Foundation Sungkyunkwan University | Method for generating binary offset carrier correlation function based on local signals, apparatus for tracking binary offset carrier signal, and spread spectrum signal receiver system |
| CN103645484A (en) * | 2013-11-29 | 2014-03-19 | 哈尔滨工程大学 | A method for processing a composite binary offset carrier modulating signal |
| CN103901446A (en) * | 2014-03-28 | 2014-07-02 | 哈尔滨工程大学 | Binary offset carrier modulation signal side peak eliminating and main peak capturing method |
| CN103926601A (en) * | 2014-04-17 | 2014-07-16 | 哈尔滨工程大学 | BOC (15, 2.5) modulation method capturing method based on combined related function |
| CN106547005A (en) * | 2015-09-18 | 2017-03-29 | 北京大学 | A kind of method and device for capturing for sinusoidal binary offset carrier (boc) modulated signals |
Non-Patent Citations (2)
| Title |
|---|
| DINGJIE XU ET AL.: "Ambiguity Mitigating Technique for Multiplexed Binary Carrier Signal Tracking", 《IEEE COMMUNICATIONS LETTERS》 * |
| 徐定杰等: "基于MBOC调制的北斗导航信号的多径误差分析", 《哈尔滨工业大学学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108897009A (en) * | 2018-06-08 | 2018-11-27 | 桂林电子科技大学 | A kind of BOC navigation signal receiver and its code tracking method |
| CN108897009B (en) * | 2018-06-08 | 2022-06-28 | 桂林电子科技大学 | BOC navigation signal receiver and code tracking method thereof |
| CN111812684A (en) * | 2020-07-22 | 2020-10-23 | 桂林电子科技大学 | BOC signal multipath suppression technology improvement method based on autocorrelation side peak elimination |
| CN114675310A (en) * | 2022-05-30 | 2022-06-28 | 长沙金维信息技术有限公司 | Carrier half-cycle repair method and RTK integer ambiguity fixing method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101132191B (en) | Baseband signal processing method for GNSS receiver | |
| CN102116866B (en) | Method and device for tracking global positioning system precision (GPS P) and/or Y code signal of full-cycle carrier | |
| CN104407323B (en) | A kind of high dynamic low signal-to-noise ratio spread-spectrum signal pseudo-code time-delay measuring method | |
| US7486717B2 (en) | Method and device for demodulating Galileo alternate binary offset carrier (Alt-BOC) signals | |
| CN101266292B (en) | GNSS reflected signal frequency domain processing unit and method | |
| US9379765B2 (en) | Method and receiver for receiving a binary offset carrier composite signal | |
| CN109188469A (en) | A kind of GNSS signal receiver curve method for parameter estimation | |
| Yang et al. | Acquisition of the GPS L5 signal using coherent combining of I5 and Q5 | |
| CN105277955A (en) | Baseband signal processing method used for GPS satellite navigation | |
| CN102608626A (en) | High-sensitivity satellite navigation signal capturing method and system | |
| CN102338878B (en) | Novel multi-path inhibition BOC (Binary Offset Carrier) code tracking method and code tracking ring | |
| CN109150233A (en) | A kind of modulation-demo-demodulation method of direct expansion dpsk signal | |
| CN108051827A (en) | BOC modulated signals are without fuzzy code tracking method | |
| CN102854516A (en) | Method and system for estimating carrier-to-noise ratio in GNSS (Global Navigation Satellite System) receiver | |
| CN104849732B (en) | A kind of binary offset carrier radio frequency navigation signal trace method | |
| CN103543456A (en) | Large frequency offset GNSS signal capture method based on segmentation relative combination FFT operation | |
| CN103439718B (en) | Unambiguous tracking unit of high-order BOC modulation signals | |
| CA2529197C (en) | Method and device for the demodulation of satellite radio navigation signals | |
| US20070253471A1 (en) | Gps Receiver Using Differential Correlation | |
| CN103941269A (en) | PN code capturing method used for satellite navigation system | |
| CN102243309A (en) | Method and apparatus for restraining cross-correlation interference in GNSS | |
| CN103760578B (en) | A kind of GNSS satellite navigation signal without fuzzy tracking method | |
| CN105372678B (en) | A kind of sine BOC modulated signal without fuzzy tracking method | |
| CN108469623A (en) | The method for eliminating the modulated signal auto-correlation function sides BOC peak | |
| CN102375149B (en) | Multi-associated-branch mixed spacing delay lock loop and application method thereof |
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: 20180518 |