CN102043091B - Digitized high-precision phase detector - Google Patents

Digitized high-precision phase detector Download PDF

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CN102043091B
CN102043091B CN 200910236386 CN200910236386A CN102043091B CN 102043091 B CN102043091 B CN 102043091B CN 200910236386 CN200910236386 CN 200910236386 CN 200910236386 A CN200910236386 A CN 200910236386A CN 102043091 B CN102043091 B CN 102043091B
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phase
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CN102043091A (en
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何俊
李芳�
刘育梁
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Institute of Semiconductors of CAS
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Abstract

The invention discloses a digitized high-precision phase detector. The digitized high-precision phase detector comprises an analogue-to-digital conversion module (10), a filter module (20), a phase difference computation module (30), a phase correction module (40), and a phase detection result storage and display module (50). The digitized high-precision phase detector provided by the invention has the advantages that: the precision is high, the measuring range is wide, the frequency range is wide, and the digitized high-precision phase detector is convenient to operate and the like; and the digitized high-precision phase detector can work in a harmonic environment.

Description

Digitized high-precision phase detector
Technical field
The present invention relates to the signal phase field of measuring technique, be specifically related to a kind of Digitized high-precision phase detector with accurate measurement two-way measured signal phase differential.
Background technology
Phase measurement is widely used for the fields such as power industry, mechanical engineering, space flight and aviation, resource exploration, communication system, radar and sonar.Along with the swift and violent raising of contemporary science and technology level, each application has proposed Secretary to phase measurement, makes phase detectors towards wide-range, broadband, high precision, digitizing, intelligentized future development.
Traditional phase detectors have multiple, according to its implementation, can be divided into analog-and digital-two large classes.Wherein, analogue phase detector mainly contains: pulse pad count formula, and measured signal is shaped to square-wave signal and forms the pulse width signal of output pulse sequence, obtain the phase differential between the counting number reflection measured signal of high-frequency impulse with this control gate circuit; Phase discriminator type, measured signal are shaped to square-wave signal and make phase demodulation through NOR gate circuit and process, then obtain the amplitude of the DC component that is directly proportional to phase differential through smothing filtering.Analogue phase detector is realized by mimic channel, needs special-purpose device, and hardware cost is high, generally is difficult to reach very high phase accuracy.
And the digital phase detecting device mainly contains: the zero passage detection formula, the coherent detection formula is based on fast fourier transform (FFT) formula.Zero passage detection formula phase detectors are very low for the phase measurement accuracy of high-frequency signal, can not satisfy the needed precision of phase measurement in modern industry; Although traditional coherent detection formula phase detectors precision is high, can only measure the phase differential between 0 to 180 degree, and measurement result is vulnerable to the interference of harmonic wave; Based on the phase detectors of FFT, there is the spectrum leakage phenomenon, the phase test precision is lower under harmonic environment.
Publication number is that the patent document of EP0660124A2 discloses a kind of Digitized high-precision phase detector of the prior art, and is for reference at this.
Summary of the invention
The technical matters that (one) will solve
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of Digitized high-precision phase detector, have advantages of high precision, wide-range, wide-band, easy to operate, can work in harmonic environment.
(2) technical scheme
For achieving the above object, the invention provides a kind of Digitized high-precision phase detector, comprising:
Analog-to-digital conversion module 10 is used for the first measured signal a1 and the second measured signal a2 of input are carried out the analog digital conversion, realizes digital collection to measured signal, the first digital sample as a result b1 and the second digital sample as a result b2 export to filter module 20;
Filter module 20, be used for to the first digital sample of analog-to-digital conversion module 10 outputs as a result b1 and the second digital sample as a result b2 carry out bandpass filtering, suppress humorous wave interference, phase difference calculating module 30 and phase place correcting module 40 are exported in the first filtering c1 and the second filtering as a result c2 as a result;
C1 and the second filtering as a result of phase difference calculating module 30, the first filtering that is used for 20 outputs of calculating filter module is the phase differential between c2 as a result, adopts cross-correlation method to carry out phase difference calculating, and phase difference calculating d is as a result exported to phase place correcting module 40;
Phase place correcting module 40, the first filtering that is used for 20 outputs of judgement filter module c1 and the second filtering as a result is phase differential symbol positive and negative between c2 as a result, then to the phase difference calculating of phase difference calculating module 30 output as a result d carry out the symbol correction, the phase detection result e that obtains, and phase detection result e is exported to phase detection result storage and display module 50;
Phase detection result storage and display module 50 are used for the phase detection result e of phase place correcting module 40 outputs is carried out the digitizing storage and shows.
In such scheme, described analog-to-digital conversion module 10 comprises:
First signal conditioning 101 is used for the first measured signal a1 of input is carried out signal condition, makes its amplitude in the first high-speed AD sampling 103 desired scopes;
Secondary signal conditioning 102 is used for the second measured signal a2 of input is carried out signal condition, makes its amplitude in the second high-speed AD sampling 104 desired scopes;
The first high-speed AD sampling 103 is used for digital collection is carried out in the output of first signal conditioning 101, completes the analog digital conversion, and sampling process is carried out controlling of sampling by computing machine;
The second high-speed AD sampling 104 is used for digital collection is carried out in the output of secondary signal conditioning 102, completes the analog digital conversion, and sampling process is carried out controlling of sampling by computing machine, and sampling rate keeps synchronizeing with the first high-speed AD sampling 103.
In such scheme, described filter module 20 comprises:
Frequency detecting 201, for detection of the first digital sample of analog-to-digital conversion module 10 output frequency of b1 as a result, and export to the first bandpass filter 202 and the second bandpass filter 203, complete the passband setting to the first bandpass filter 202 and the second bandpass filter 203;
The first bandpass filter 202, be used for to the first digital sample as a result b1 carry out bandpass filtering, filter bandwidht is controlled by frequency detecting 201 Output rusults;
The second bandpass filter 203, be used for to the second digital sample as a result b2 carry out bandpass filtering, filter bandwidht is controlled by frequency detecting 201 Output rusults, the wave filter setting of the second bandpass filter 203 is identical with the first bandpass filter 202 maintenances.
In such scheme, described phase difference calculating module 30 comprises the first cross-correlation calculation 301, the first autocorrelation calculation 302, the second autocorrelation calculation 303, the first square root extractor 304, the second square root extractor 305, multiplier 306, divider 307 and arc cosine computing 308, wherein:
C1 and the second filtering as a result of the first cross-correlation calculation 301, the first filtering that is used for 20 outputs of calculating filter module is the cross correlation value between c2 as a result, and result of calculation is exported to divider 307;
The first autocorrelation calculation 302 and the second autocorrelation calculation 303 are respectively used to calculate the first filtering c1 and the second filtering as a result autocorrelation value of c2 as a result, and result of calculation is exported to respectively the first square root extractor 304 and the second square root extractor 305;
The first square root extractor 304 is used for the Output rusults of the first autocorrelation calculation 302 is carried out extracting operation, and operation result is exported to multiplier 306;
The second square root extractor 305 is used for the Output rusults of the second autocorrelation calculation 303 is carried out extracting operation, and operation result is exported to multiplier 306;
Multiplier 306 is used for the Output rusults of the first square root extractor 304 and the second square root extractor 305 is carried out multiplication mutually, and operation result is exported to divider 307;
Divider 307 is used for the Output rusults of the first cross-correlation calculation 301 and multiplier 306 is carried out division operation mutually, and operation result is exported to arc cosine computing 308;
Arc cosine computing 308 is used for the Output rusults of divider 307 is carried out arc cosine computing.
In such scheme, described phase place correcting module 40 comprises:
The first shift unit 401, be used for to the first filtering as a result c1 to carry out length be 1 displacement;
The second shift unit 402, be used for to the second filtering as a result c2 to carry out length be 1 displacement;
The second cross-correlation calculation 403 be used for to be calculated the first filtering c1 and the second filtering as a result cross correlation value between the shift value of c2 as a result;
The 3rd cross-correlation calculation 404 be used for to be calculated the second filtering c2 and the first filtering as a result cross correlation value between the shift value of c1 as a result;
Subtracter 405 is used for the Output rusults of the second cross-correlation calculation 403 and the 3rd cross-correlation calculation 404 is carried out additive operation;
Symbol decision 406, Output rusults by subtracter 405, be used for judgement the first filtering c1 and the second filtering as a result phase differential symbol positive and negative between c2 as a result, if the Output rusults of subtracter 405 is greater than zero, the first filtering c1 and the second filtering as a result as a result between c2 the phase differential symbol for just, if the Output rusults of subtracter 405 is less than zero, the first filtering c1 and the second filtering as a result as a result between c2 the phase differential symbol for negative;
Symbol correction 407, be used for to the phase difference calculating of phase difference calculating module 30 outputs as a result d carry out the symbol correction.
(3) beneficial effect
Digitized high-precision phase detector provided by the invention is compared with existing phase detectors, has following advantage:
1), high precision: phase accuracy can reach 0.01 degree, and prior art generally can only reach 0.1 degree.
2), wide-range: can measure from-180 degree to all phase differential 180 degree.
3), wide-band: from 1Hz to 50kHz.
4), easy to operate: Digital Realization, be convenient to adjust.
5), can work in harmonic environment.
Description of drawings
Fig. 1 is the structural representation of Digitized high-precision phase detector provided by the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.
In conjunction with the drawings most preferred embodiment according to the present invention is described in detail, the advantage of other aspects of the present invention will become clear and be more readily understood.
The poor ultimate principle of test phase of the present invention is as follows:
If two measured signals are as shown in the formula shown in (1), (2):
x(t)＝Asin2πft+N x(t) (1)
Figure GDA00002674288400051
Wherein, A, B are the amplitude of x (t), y (t) signal, N x(t), N y(t) be respectively noise on x (t), y (t) signal, f is signal frequency,
Figure GDA00002674288400052
Be the phase differential between the two-way measured signal.
To x (t), y (t) carries out computing cross-correlation, has:
R xy ( τ ) = 1 T ∫ 0 T x ( t ) y ( t + τ ) dt - - - ( 3 )
When τ=0,
Figure GDA00002674288400054
Because noise is uncorrelated with signal, and also uncorrelated between noise, obtain after integration:
Figure GDA00002674288400055
Therefore, phase differential can obtain by following formula:
Figure GDA00002674288400056
The amplitude of two signals can be determined by autocorrelation function.
R x ( τ ) = 1 T ∫ 0 T x ( t ) x ( t + τ ) dt = A 2 2 cos 2 πfτ - - - ( 7 )
When τ=0, can obtain:
R x ( 0 ) = A 2 2 - - - ( 8 )
Therefore have:
A = 2 R x ( 0 ) - - - ( 9 )
In like manner, can obtain,
B = 2 R y ( 0 ) - - - ( 10 )
For the signal after digitizing, corresponding discrete formula is:
R xy ( 0 ) = 1 N Σ i = 0 N - 1 x ( i ) y ( i ) - - - ( 11 )
R x ( 0 ) = 1 N Σ i = 0 N - 1 x ( i ) 2 - - - ( 12 )
R y ( 0 ) = 1 N Σ i = 0 N - 1 y ( i ) 2 - - - ( 13 )
Figure GDA00002674288400067
Wherein, N is the sampling length of a frame.
More than measure
Figure GDA00002674288400068
Value, scope,, also need to judge in order test specification to be expanded to-180 degree between 180 degree between 180 degree at 0 degree Positive and negative.
To y (t), x (t) carries out computing cross-correlation, has:
R yx ( τ ) = 1 T ∫ 0 T y ( t ) x ( t + τ ) dt - - - ( 15 )
Figure GDA000026742884000611
For digitized signal, discrete formula is:
Figure GDA00002674288400071
Figure GDA00002674288400072
Both is poor
Figure GDA00002674288400073
When m=1, can obtain:
Figure GDA00002674288400074
Usually have
Figure GDA00002674288400075
Therefore, if S (1)＞0, Symbol is for just;
Otherwise, if S (1)＜0,
Figure GDA00002674288400077
Symbol is for negative.
And then carry out the symbol correction on the phase differential numerical value of (14) calculating gained, finally obtain
Figure GDA00002674288400078
Its test specification is between-180 degree are to 180.
Based on the above-mentioned principle that realizes, Fig. 1 shows the structural representation of Digitized high-precision phase detector provided by the invention, this Digitized high-precision phase detector comprises analog-to-digital conversion module 10, filter module 20, phase difference calculating module 30, phase place correcting module 40 and phase detection result storage and display module 50, wherein:
Analog-to-digital conversion module 10 is used for the first measured signal a1 and the second measured signal a2 of input are carried out the analog digital conversion, realizes digital collection to measured signal, the first digital sample as a result b1 and the second digital sample as a result b2 export to filter module 20;
Filter module 20, be used for to the first digital sample of analog-to-digital conversion module 10 outputs as a result b1 and the second digital sample as a result b2 carry out bandpass filtering, suppress humorous wave interference, phase difference calculating module 30 and phase place correcting module 40 are exported in the first filtering c1 and the second filtering as a result c2 as a result;
C1 and the second filtering as a result of phase difference calculating module 30, the first filtering that is used for 20 outputs of calculating filter module is the phase differential between c2 as a result, adopts cross-correlation method to carry out phase difference calculating, and phase difference calculating d is as a result exported to phase place correcting module 40;
Phase place correcting module 40, the first filtering that is used for 20 outputs of judgement filter module c1 and the second filtering as a result is phase differential symbol positive and negative between c2 as a result, then to the phase difference calculating of phase difference calculating module 30 output as a result d carry out the symbol correction, the phase detection result e that obtains, and phase detection result e is exported to phase detection result storage and display module 50;
Phase detection result storage and display module 50 are used for the phase detection result e of phase place correcting module 40 outputs is carried out the digitizing storage and shows.
Described analog-to-digital conversion module 10 comprises first signal conditioning 101, secondary signal conditioning 102, first high-speed AD sampling the 103 and second high-speed AD sampling 104, wherein:
First signal conditioning 101 is used for the first measured signal a1 of input is carried out signal condition, makes its amplitude in the first high-speed AD sampling 103 desired scopes;
Secondary signal conditioning 102 is used for the second measured signal a2 of input is carried out signal condition, makes its amplitude in the second high-speed AD sampling 104 desired scopes;
The first high-speed AD sampling 103 is used for digital collection is carried out in the output of first signal conditioning 101, completes the analog digital conversion, and sampling process is carried out controlling of sampling by computing machine;
The second high-speed AD sampling 104 is used for digital collection is carried out in the output of secondary signal conditioning 102, completes the analog digital conversion, and sampling process is carried out controlling of sampling by computing machine, and sampling rate keeps synchronizeing with the first high-speed AD sampling 103.
Described filter module 20 comprises frequency detecting 201, the first bandpass filter 202 and the second bandpass filter 203, wherein:
Frequency detecting 201, for detection of the first digital sample of analog-to-digital conversion module 10 output frequency of b1 as a result, and export to the first bandpass filter 202 and the second bandpass filter 203, complete the passband setting to the first bandpass filter 202 and the second bandpass filter 203;
The first bandpass filter 202, be used for to the first digital sample as a result b1 carry out bandpass filtering, filter bandwidht is controlled by frequency detecting 201 Output rusults;
The second bandpass filter 203, be used for to the second digital sample as a result b2 carry out bandpass filtering, filter bandwidht is controlled by frequency detecting 201 Output rusults, the wave filter setting of the second bandpass filter 203 is identical with the first bandpass filter 202 maintenances.
Described phase difference calculating module 30 comprises the first cross-correlation calculation 301, the first autocorrelation calculation 302, the second autocorrelation calculation 303, the first square root extractor 304, the second square root extractor 305, multiplier 306, divider 307 and arc cosine computing 308, wherein:
C1 and the second filtering as a result of the first cross-correlation calculation 301, the first filtering that is used for 20 outputs of calculating filter module is the cross correlation value between c2 as a result, and result of calculation is exported to divider 307;
The first autocorrelation calculation 302 and the second autocorrelation calculation 303 are respectively used to calculate the first filtering c1 and the second filtering as a result autocorrelation value of c2 as a result, and result of calculation is exported to respectively the first square root extractor 304 and the second square root extractor 305;
The first square root extractor 304 is used for the Output rusults of the first autocorrelation calculation 302 is carried out extracting operation, and operation result is exported to multiplier 306;
The second square root extractor 305 is used for the Output rusults of the second autocorrelation calculation 303 is carried out extracting operation, and operation result is exported to multiplier 306;
Multiplier 306 is used for the Output rusults of the first square root extractor 304 and the second square root extractor 305 is carried out multiplication mutually, and operation result is exported to divider 307;
Divider 307 is used for the Output rusults of the first cross-correlation calculation 301 and multiplier 306 is carried out division operation mutually, and operation result is exported to arc cosine computing 308;
Arc cosine computing 308 is used for the Output rusults of divider 307 is carried out arc cosine computing.
Described phase place correcting module 40 comprises the first shift unit 401, the second shift unit 402, the second cross-correlation calculation 403, the 3rd cross-correlation calculation 404, subtracter 405, symbol decision 406 and symbol correction 407, wherein:
The first shift unit 401, be used for to the first filtering as a result c1 to carry out length be 1 displacement;
The second shift unit 402, be used for to the second filtering as a result c2 to carry out length be 1 displacement;
The second cross-correlation calculation 403 be used for to be calculated the first filtering c1 and the second filtering as a result cross correlation value between the shift value of c2 as a result;
The 3rd cross-correlation calculation 404 be used for to be calculated the second filtering c2 and the first filtering as a result cross correlation value between the shift value of c1 as a result;
Subtracter 405 is used for the Output rusults of the second cross-correlation calculation 403 and the 3rd cross-correlation calculation 404 is carried out additive operation;
Symbol decision 406, Output rusults by subtracter 405, be used for judgement the first filtering c1 and the second filtering as a result phase differential symbol positive and negative between c2 as a result, if the Output rusults of subtracter 405 is greater than zero, the first filtering c1 and the second filtering as a result as a result between c2 the phase differential symbol for just, if the Output rusults of subtracter 405 is less than zero, the first filtering c1 and the second filtering as a result as a result between c2 the phase differential symbol for negative;
Symbol correction 407, be used for to the phase difference calculating of phase difference calculating module 30 outputs as a result d carry out the symbol correction.
The data collecting card USB-9215 that the embodiment of the present invention adopts American National instrument company (NI) to produce has built Digitized high-precision phase detector in conjunction with software LabVIEW 8.5.USB-9215 is a 4 channel/simultaneous data-acquisitions, realizes the function of high-speed a/d sampling, and its precision is 16, and sampling rate is 100kS/s, and sampling is controlled by computing machine.Coding in LabVIEW8.5 is realized the function of each module shown in Fig. 1.The same frequency sine-wave of two-way that utilizes phase difference signal generator generation phase differential and frequency to arrange, the input Digitized high-precision phase detector, the minimum phase differential that can arrange of phase difference signal generator is 0.001 degree.
Test result shows: this Digitized high-precision phase detector index is as follows:
Phase resolution: 0.01 degree;
Measurement range :-180 degree are to 180 degree;
Frequency range: from 1Hz to 50kHz;
This Digitized high-precision phase detector also has in the environment that can work in harmonic environment and have noise, easy to operate, the characteristics being convenient to adjust.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims (5)

1. a Digitized high-precision phase detector, is characterized in that, comprising:
Analog-to-digital conversion module (10), be used for the first measured signal a1 and the second measured signal a2 of input are carried out the analog digital conversion, realize digital collection to measured signal, the first digital sample as a result b1 and the second digital sample as a result b2 export to filter module (20);
Filter module (20), be used for to the first digital sample of analog-to-digital conversion module (10) output as a result b1 and the second digital sample as a result b2 carry out bandpass filtering, suppress humorous wave interference, phase difference calculating module (30) and phase place correcting module (40) are exported in the first filtering c1 and the second filtering as a result c2 as a result;
Phase difference calculating module (30), the first filtering that is used for calculating filter module (20) output c1 and the second filtering as a result is the phase differential between c2 as a result, adopt cross-correlation method to carry out phase difference calculating, phase difference calculating d is as a result exported to phase place correcting module (40);
Phase place correcting module (40), the first filtering that is used for judgement filter module (20) output c1 and the second filtering as a result is phase differential symbol positive and negative between c2 as a result, then to the phase difference calculating of phase difference calculating module (30) output as a result d carry out the symbol correction, the phase detection result e that obtains, and phase detection result e is exported to phase detection result storage and display module (50);
Phase detection result storage and display module (50) are used for the phase detection result e of phase place correcting module (40) output is carried out the digitizing storage and shows.
2. Digitized high-precision phase detector according to claim 1, is characterized in that, wherein said analog-to-digital conversion module (10) comprises:
First signal conditioning (101) is used for the first measured signal a1 of input is carried out signal condition, makes its amplitude in the first high-speed AD is sampled (103) desired scope;
Secondary signal conditioning (102) is used for the second measured signal a2 of input is carried out signal condition, makes its amplitude in the second high-speed AD is sampled (104) desired scope;
The first high-speed AD sampling (103) is used for digital collection is carried out in the output of first signal conditioning (101), completes the analog digital conversion, and sampling process is carried out controlling of sampling by computing machine;
The second high-speed AD sampling (104), be used for digital collection is carried out in the output of secondary signal conditioning (102), complete analog digital conversion, sampling process is carried out controlling of sampling by computing machine, and (103) maintenance of sampling of sampling rate and the first high-speed AD is synchronizeed.
3. Digitized high-precision phase detector according to claim 1, is characterized in that, wherein said filter module (20) comprises:
Frequency detecting (201), for detection of the first digital sample of analog-to-digital conversion module (10) output frequency of b1 as a result, and export to the first bandpass filter (202) and the second bandpass filter (203), complete the passband setting to the first bandpass filter (202) and the second bandpass filter (203);
The first bandpass filter (202), be used for to the first digital sample as a result b1 carry out bandpass filtering, filter bandwidht is controlled by frequency detecting (201) Output rusults;
The second bandpass filter (203), be used for to the second digital sample as a result b2 carry out bandpass filtering, filter bandwidht is controlled by frequency detecting (201) Output rusults, and the wave filter setting of the second bandpass filter (203) keeps identical with the first bandpass filter (202).
4. Digitized high-precision phase detector according to claim 1, it is characterized in that, wherein said phase difference calculating module (30) comprises the first cross-correlation calculation (301), the first autocorrelation calculation (302), the second autocorrelation calculation (303), the first square root extractor (304), the second square root extractor (305), multiplier (306), divider (307) and arc cosine computing (308), wherein:
C1 and the second filtering as a result of the first cross-correlation calculation (301), the first filtering that is used for calculating filter module (20) output is the cross correlation value between c2 as a result, and result of calculation is exported to divider (307);
The first autocorrelation calculation (302) and the second autocorrelation calculation (303) are respectively used to calculate the first filtering c1 and the second filtering as a result autocorrelation value of c2 as a result, and result of calculation is exported to respectively the first square root extractor (304) and the second square root extractor (305);
The first square root extractor (304) is used for the Output rusults of the first autocorrelation calculation (302) is carried out extracting operation, and operation result is exported to multiplier (306);
The second square root extractor (305) is used for the Output rusults of the second autocorrelation calculation (303) is carried out extracting operation, and operation result is exported to multiplier (306);
Multiplier (306) is used for the Output rusults of the first square root extractor (304) and the second square root extractor (305) is carried out multiplication mutually, and operation result is exported to divider (307);
Divider (307) is used for the Output rusults of the first cross-correlation calculation (301) and multiplier (306) is carried out division operation mutually, and operation result is exported to arc cosine computing (308);
Arc cosine computing (308) is used for the Output rusults of divider (307) is carried out arc cosine computing.
5. Digitized high-precision phase detector according to claim 1, is characterized in that, wherein said phase place correcting module (40) comprises:
The first shift unit (401), be used for to the first filtering as a result c1 to carry out length be 1 displacement;
The second shift unit (402), be used for to the second filtering as a result c2 to carry out length be 1 displacement;
The second cross-correlation calculation (403) be used for to be calculated the first filtering c1 and the second filtering as a result cross correlation value between the shift value of c2 as a result;
The 3rd cross-correlation calculation (404) be used for to be calculated the second filtering c2 and the first filtering as a result cross correlation value between the shift value of c1 as a result;
Subtracter (405) is used for the Output rusults of the second cross-correlation calculation (403) and the 3rd cross-correlation calculation (404) is carried out additive operation;
Symbol decision (406), Output rusults by subtracter (405), be used for judgement the first filtering c1 and the second filtering as a result phase differential symbol positive and negative between c2 as a result, if the Output rusults of subtracter (405) is greater than zero, the first filtering c1 and the second filtering as a result as a result between c2 the phase differential symbol for just, if the Output rusults of subtracter (405) is less than zero, the first filtering c1 and the second filtering as a result as a result between c2 the phase differential symbol for negative;
Symbol correction (407), be used for to the phase difference calculating of phase difference calculating module (30) output as a result d carry out the symbol correction.
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