CN101038336B - Method and device used for navigation teletext bit synchronization - Google Patents
Method and device used for navigation teletext bit synchronization Download PDFInfo
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Abstract
The invention discloses a method and device for navigation message bit synchronization. Through a correlator, the invention may fulfill the frequency mixing, detuning and relevant integrating for the received navigation signal; through the phase differential detector, detect the phase difference of results for adjacent coorelated integrating; through a differential information totalizer, the phase differential information may be strengthened; through a frequency deviation estimation device, the frequency deviation of a signal may be estimated; according to the estimated frequency deviation, fulfill the frequency deviation compensation for phase differential information through the frequency deviation corrector; through a bit boundary decision device, the boundary of phase differential information may be determined to realize the bit synchronization of navigation message. Due to detect the bit boundary through the signal phase differential, and combine the accurate frequency deviation estimation to correct and compensate the phase differential, so under a high frequency deviation, the invention may still fulfill the accurate bit synchronization, and accurately estimate the signal frequency deviation at the same time.
Description
Technical field
The present invention relates to the bit synchronous field of navigation message in the navigation neceiver, relate in particular to a kind of method and device thereof that is used for navigation message bit synchronization.
Background technology
The global navigation satellite location technology is a kind of high-end technology, is widely used in fields such as mapping, military, communication, electric power and aerial survey remote controls.The navigation message bit synchronization device of satellite navigation receiver is the key modules of satellite navigation receiver, its main effect is after pseudo-code is synchronous, to finish the detection of bit boundaries, realize bit synchronous, so that can carry out correct bit demodulation and text extraction.
The data bit period of satellite navigation signals generally is the integral multiple in the pseudo-code cycle of thick/intercepting and capturing sign indicating number, and multiple is generally 10 times or 20 times.For example, GPS C/A sign indicating number, sequence length are 1023, and basic bit rate is 1.023 megahertzes, and the pseudo-code sequence cycle is 1 millisecond, and corresponding data bit-rate is 50 bps, and a bit period comprises the pseudo-code sequence in 20 cycles.Finish pseudo-code signal synchronously after, can accurately know the position that yard sequence begins, but also can't be 20 milliseconds bit boundaries position the acquisition cycle.Signal to noise ratio (S/N ratio) when improving bit decision must know clearly the position of bit boundaries.
The method for synchronous that more common navigation message bit synchronization method has people such as Kokkonen to propose based on signal energy.This method is accumulated all signal energies that each position candidate begins in the bit period, if maximum bit energy appears in relative other position candidate of certain position candidate, thinks that then this position is exactly the position of bit boundaries.Thisly can under lower signal to noise ratio (S/N ratio), detect bit boundaries based on the signal energy estimation approach, but they must operate under the situation of phaselocked loop or FLL locking, when carrier frequency offset was greater than 25 hertz, this method just can't be carried out correct bit synchronous.
Summary of the invention
The objective of the invention is the deficiency that the bit synchronous technology at existing navigation message exists under big offset frequency situation, proposed a kind of method and device thereof that is used for navigation message bit synchronization.
The present invention includes following steps:
1) with correlator the navigation spread-spectrum signal that receives is carried out mixing, despreading and correlation integral;
2) with the phase difference detecting device phase differential between the correlation integral result is detected;
3) with the difference information totalizer phase difference information is strengthened;
4) with the frequency departure estimator frequency departure of signal is estimated;
5) frequency departure that obtains according to the frequency departure estimator is revised phase difference with the frequency departure corrector, and the phase difference that is corrected is strengthened phase difference information or unstrengthened phase difference information;
6) with the border decision device revised phase difference data are adjudicated, determine the bit boundaries position, realize bit synchronous.
The phase difference detecting device adopts time-delay conjugation correlator or subtracter; Phase corrector adopts conjugation multiplier or subtracter, and the conjugation multiplier adopts complex conjugate device and complex multiplier.
The step of phase difference detection that time-delay conjugation correlator carries out adjacent correlation integral result is as follows:
1) will import data with complex multiplier and last one conjugation of constantly importing data multiplies each other;
2) will import data with delay register and preserve, and time-delay output;
3) with the complex conjugate device data of time-delay output are asked conjugate operation.
The step that the difference information totalizer is strengthened phase difference information is as follows:
1) data distributor will be imported data allocations in the different accumulator registers of totalizer group;
2) data allocations of dispensing controller determination data divider is in which accumulator register;
3) the totalizer group is made up of a plurality of accumulator registers, and the input data that distribution is obtained add up respectively.
Correlator is as follows to the step that the navigation spread-spectrum signal carries out mixing, despreading and correlation integral:
1) according to the carrier signal of local carrier generator generation the navigation spread-spectrum signal that receives is carried out carrier wave with frequency mixer and peel off, make it become baseband signal;
2) by the pseudo-code despreader baseband signal being carried out pseudo-code peels off;
3) carry out correlation integral by integration/remover integrator.
A kind of device that is used for navigation message bit synchronization: correlator links to each other with time-delay conjugation correlator, time-delay conjugation correlator links to each other with difference information totalizer, frequency departure estimator respectively, the difference information totalizer links to each other with the frequency departure corrector, the frequency departure estimator links to each other with the frequency departure corrector, and the frequency departure corrector links to each other with the bit boundaries decision device.
The internal module annexation of time-delay conjugation correlator is: delay register links to each other with complex conjugate device, complex multiplier.The internal module annexation of difference information totalizer is: dispensing controller links to each other with data distributor, totalizer group.The internal module annexation of frequency departure corrector is: the complex conjugate device links to each other with complex multiplier.The internal module annexation of correlator is: the local carrier generator links to each other with frequency mixer, pseudo-code despreader, integration/remover.
A kind of method that is used for navigation message bit synchronization disclosed by the invention and device thereof are owing to carry out the detection of bit boundaries according to the phase difference of signal, and can estimate phase difference is carried out correction-compensation in conjunction with accurate frequency deviation, so have extraordinary big frequency deviation tolerance performance, under the situation of less frequency deviation and big frequency deviation, bit synchronous accurately can both be carried out, and the accurate estimation of frequency deviation signal can be obtained simultaneously.
Description of drawings
Fig. 1 is the enforcement block scheme of navigation message bit synchronization device;
Fig. 2 is the enforcement block scheme of time-delay conjugation correlator;
Fig. 3 is the enforcement block scheme of difference information totalizer;
Fig. 4 is the enforcement block scheme of frequency departure corrector;
Fig. 5 is the enforcement block scheme of correlator.
Embodiment
As Fig. 1～shown in Figure 5, navigation message bit synchronization method of the present invention and device thereof comprise following embodiment and step:
Figure 1 shows that one is used for the method for navigation message bit synchronization and the enforcement simplified block diagram of device thereof, it is made up of correlator, time-delay conjugation correlator, difference information totalizer, frequency departure estimator, frequency departure corrector and 6 modules of bit boundaries decision device.In this embodiment, correlator carries out the computing that grades of mixing, despreading and correlation product to the navigation spread-spectrum signal that receives, and obtains correlation integral X as a result
i, wherein subscript i represents i correlation integral result.Time-delay conjugation correlator is to correlation integral X as a result
iCarry out the detection of phase difference information, in bit boundaries, when the variation of 0-＞1 or 1-＞0 took place transmitted bit, correlation integral result's phase difference was about π; And in the position of non-bit boundaries, correlation integral result's phase difference is about 0.The difference information totalizer is strengthened the phase difference information of time-delay conjugation correlator output, reduces the interference of random noise, improves the accuracy of judgement, improves the bit synchronous performance.The frequency departure estimator is estimated the frequency departure of signal according to the phase difference information of time-delay conjugation correlator output.The estimated signal of frequency departure is sent into the frequency departure corrector phase difference information is revised, and reduces the influence of frequency departure to phase difference, improves the bit synchronous performance under big frequency deviation.The border decision device is adjudicated phase difference information, judges whether bit boundaries of certain position.
Figure 2 shows that the concrete enforcement block diagram of time-delay conjugation correlator, it is made up of complex multiplier, delay register and 3 modules of complex conjugate device.The correlation integral that the input of time-delay conjugation correlator comes autocorrelator output is X as a result
iComplex multiplier is with X
iWith the last moment correlation integral of delay register output X as a result
I-1Conjugation carry out complex multiplication operation.Delay register is preserved the input data, and postpones output integral time.The complex conjugate device is got the computing of conjugation to the input data.The output of complex multiplier, the output of the conjugation of promptly delaying time correlator is Z as a result
iFor:
In the formula, A represents correlation integral result's signal amplitude, ψ
iAnd ψ
I-1Represent X respectively
iAnd X
I-1Phase place, Δ ψ
i=ψ
i-ψ
I-1Expression X
iAnd X
I-1Phase differential, N
iThe expression random noise.
Can find that the output of time-delay conjugation correlator is Z as a result
iComprised adjacent data X
iAnd X
I-1Phase difference information Δ ψ
iIf position i is the border of bit change, phase differential is:
Δψ
i＝ψ
i-ψ
i-1＝2πfT+π
In the formula, f represents the frequency departure of signal, and T is the integral time of correlator, under the less situation of frequency departure f, and phase difference ψ
iBe about π.
When position i to be detected was not the bit change border, phase differential was:
Δψ
i＝ψ
i-ψ
i-1＝2πfT
Under the less situation of frequency departure f, phase difference ψ is about 0.
Figure 3 shows that the concrete enforcement block scheme of difference information totalizer, it is made up of data distributor, dispensing controller and 3 modules of totalizer group.The control information that data distributor provides according to dispensing controller will comprise phase difference Δ ψ
iInput data Z
iBe assigned in the totalizer group and accumulate computing.The totalizer group is made up of a plurality of accumulator registers, and the number of accumulator register depends on a bit period T
bTime-delay conjugation correlator output data Z in time
iNumber, i.e. the position candidate number of bit boundaries.The expression formula of p accumulator register is in the totalizer group:
In the formula, M
2The data sum that each accumulator register receives in the expression totalizer group, the duration of always adding up of totalizer group is M
2AT, A=T
b/ T is bit period T
bTime-delay conjugation correlator output data Z in time
iNumber, the expression bit boundaries the position candidate number.
The distribution principle of dispensing controller is that the time is divided into bit period T mutually
bThe delay conjugation correlated results Z of integral multiple
p, Z
P+A, Z
P+A*2... Z
P+A* (M2-1)Be put in the identical accumulator register.For example in the GPS C/A sign indicating number receiver, bit period T
b=20 milliseconds, T=1 millisecond integral time of correlator in the satellite navigation receiver, then A=20 represents that the position candidate of bit boundaries has 20 kinds of possibilities.At this moment the totalizer group is made up of 20 accumulator registers, accumulator register V
pSubscript p be integer between 0 to 19, the output of each accumulator register is V as a result
pBe by Z
p, Z
P+20, Z
P+20*2... Z
P+20* (M2-1)The result who adds up etc. data.
Each accumulation result V
pThe phase deviation information that comprises position candidate p.When p was not bit boundaries, accumulator register is V as a result
pFor:
In the formula, N
pThe expression random noise.
When p is bit boundaries, because the probability that transmitted bit changes is about 0.5, at the output that postpones conjugation correlator Z as a result
iIn, Δ ψ
iThe probability of=fT and Δ ψ
iThe probability of=fT+ π is equal substantially, and accumulator register is V as a result
pFor:
It is the random noise of 0 average.
Figure 4 shows that the concrete enforcement block diagram of frequency departure corrector, it is made up of complex multiplier and two modules of complex conjugate device.One input data by after the complex conjugate device and another import data and in complex multiplier, carry out complex multiplication.
The frequency departure estimator is conjugate multiplication Z as a result
iDirectly add up, the expression formula that adds up is:
In the formula, M
1Expression cumulative data sum, the duration of cumulative data is M
1T.
Can know, when two conjugate multiplication results' phase phasic difference is π, the adding up and be about 0 of two numbers.Because it is bigger that the likelihood ratio of phase overturn does not take place the adjacent data phase place of correlator output, promptly the probability of Δ ψ=fT is greater than the probability of Δ ψ=fT+ π, so accumulation results V
TBe about:
In the formula, A
TThe expression amplitude, N
TThe expression random noise.
As can be seen, the output V of frequency departure estimator
TIn comprised the information of frequency deviation signal f.
The output that obtains according to the frequency departure estimator is V as a result
T, all accumulation register that the difference information totalizer obtained by the frequency departure corrector are V as a result
pCarry out the frequency departure correction of phase difference respectively.With the output of frequency departure estimator V as a result
TDeliver in the complex conjugate device, obtain V
TConjugation, be input to again in the complex multiplier and phase difference accumulation results V
pCarry out complex multiplication, obtain revised phase difference U as a result
pWhen p is not bit boundaries:
In the formula
It is the random noise of 0 average.
When p is bit boundaries:
It is the random noise of 0 average.
The border decision device is to the phase deviation of phase detectors output U as a result
pCarry out the border judgement, thereby obtain the position on correct bit change border.The judgement expression formula that the border decision device adopts is:
The border decision device is by comparing U
pReal part judge that position p is the position of bit boundaries, the position of bit boundaries is thought in the less position of real part.λ (p)=1, expression position p is the position of bit boundaries, has found bit boundaries then to finish bit synchronous.
With phase difference accumulation results V
pDeliver in the complex conjugate device, obtain V
pConjugation, be input to again in the complex multiplier and the output of frequency departure estimator V as a result
TCarry out complex multiplication, obtain revised phase difference W as a result
pWith W
pSending into the border decision device adjudicates and can access and U
pIdentical border court verdict.
Figure 5 shows that the concrete enforcement block diagram of correlator, correlator mainly comprises 4 modules such as frequency mixer, local carrier generator, pseudo-code despreader and integration/remover.The carrier signal that adopts frequency mixer to produce according to the local carrier generator is carried out carrier wave to the navigation spread-spectrum signal that receives and is peeled off, make it become baseband signal, carry out pseudo-code by the pseudo-code despreader then and peel off, carry out data integrate by integration/remover again, obtain the correlation integral result.
Claims (10)
1. method that is used for navigation message bit synchronization is characterized in that may further comprise the steps:
1) with correlator the navigation spread-spectrum signal that receives is carried out mixing, despreading and correlation integral;
2) with the phase difference detecting device phase differential between the correlation integral result is detected;
3) with the difference information totalizer phase difference information is strengthened;
4) with the frequency departure estimator frequency departure of signal is estimated;
5) frequency departure that obtains according to the frequency departure estimator is revised phase difference with the frequency departure corrector, and the phase difference that is corrected is strengthened phase difference information or unstrengthened phase difference information;
6) with the border decision device revised phase difference data are adjudicated, determine the bit boundaries position, realize bit synchronous.
2. a kind of method that is used for navigation message bit synchronization according to claim 1 is characterized in that, described phase difference detecting device adopts time-delay conjugation correlator; The frequency departure corrector adopts the conjugation multiplier, and the conjugation multiplier adopts complex conjugate device and complex multiplier.
3. a kind of method that is used for navigation message bit synchronization according to claim 2 is characterized in that, the step of described phase difference detection of carrying out adjacent correlation integral result with time-delay conjugation correlator is as follows:
1) will import data with complex multiplier and last one conjugation of constantly importing data multiplies each other;
2) will import data with delay register and preserve, and time-delay output;
3) with the complex conjugate device data of time-delay output are asked conjugate operation.
4. a kind of method that is used for navigation message bit synchronization according to claim 1 is characterized in that, the described step of phase difference information being strengthened with the difference information totalizer is as follows:
1) data allocations of dispensing controller determination data divider is in which accumulator register;
2) data distributor will be imported data allocations in the different accumulator registers of totalizer group according to the control information of dispensing controller;
3) the totalizer group is made up of a plurality of accumulator registers, and the input data that distribution is obtained add up respectively.
5. a kind of method that is used for navigation message bit synchronization according to claim 1 is characterized in that, and is described as follows to the step that the navigation spread-spectrum signal carries out mixing, despreading and correlation integral with correlator:
1) according to the carrier signal of local carrier generator generation the navigation spread-spectrum signal that receives is carried out carrier wave with frequency mixer and peel off, make it become baseband signal;
2) by the pseudo-code despreader baseband signal being carried out pseudo-code peels off;
3) carry out correlation integral by integration/remover.
6. device that is used for navigation message bit synchronization, it is characterized in that, correlator links to each other with time-delay conjugation correlator, time-delay conjugation correlator links to each other with difference information totalizer, frequency departure estimator respectively, the difference information totalizer links to each other with the frequency departure corrector, the frequency departure estimator links to each other with the frequency departure corrector, and the frequency departure corrector links to each other with the bit boundaries decision device.
7. a kind of device that is used for navigation message bit synchronization according to claim 6 is characterized in that, the internal module annexation of described time-delay conjugation correlator is: delay register links to each other with complex conjugate device, complex multiplier order successively.
8. a kind of device that is used for navigation message bit synchronization according to claim 6 is characterized in that, the internal module annexation of described difference information totalizer is: dispensing controller links to each other with data distributor, totalizer group order successively.
9. a kind of device that is used for navigation message bit synchronization according to claim 6 is characterized in that the internal module annexation of described frequency departure corrector is: the complex conjugate device links to each other with complex multiplier.
10. a kind of device that is used for navigation message bit synchronization according to claim 6 is characterized in that, the internal module annexation of described correlator is: the local carrier generator links to each other with frequency mixer, pseudo-code despreader, integration/remover order successively.
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| CN104280747B (en) * | 2013-07-09 | 2017-04-05 | 安凯(广州)微电子技术有限公司 | A kind of satellite navigation message fault-tolerance approach and device |
| CN108337015B (en) * | 2017-12-26 | 2019-09-20 | 武汉船舶通信研究所（中国船舶重工集团公司第七二二研究所） | A kind of pseudo-code method for catching and device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6088410A (en) * | 1997-05-23 | 2000-07-11 | Nec Corporation | False-synchronization detection device for bit-synchronous circuit of . .pi/4-shift DQPSK demodulator |
| CN1873437A (en) * | 2005-06-01 | 2006-12-06 | 联发科技股份有限公司 | Method, system and receiver for detection bit boundary in acceptance signal |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6088410A (en) * | 1997-05-23 | 2000-07-11 | Nec Corporation | False-synchronization detection device for bit-synchronous circuit of . .pi/4-shift DQPSK demodulator |
| CN1873437A (en) * | 2005-06-01 | 2006-12-06 | 联发科技股份有限公司 | Method, system and receiver for detection bit boundary in acceptance signal |
Non-Patent Citations (1)
| Title |
|---|
| Mikko Kokkonen et al,.A New Bit Synchronization Method for a GPS Receiver.Position Iocation and Navigation Symposium.2002,85-90. * |
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