CN102571136A - Correlated peak detection method of double channel pn code acquisition system - Google Patents

Correlated peak detection method of double channel pn code acquisition system Download PDF

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CN102571136A
CN102571136A CN2012100202288A CN201210020228A CN102571136A CN 102571136 A CN102571136 A CN 102571136A CN 2012100202288 A CN2012100202288 A CN 2012100202288A CN 201210020228 A CN201210020228 A CN 201210020228A CN 102571136 A CN102571136 A CN 102571136A
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relevant peaks
relevant
data segment
satisfy
code
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CN102571136B (en
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冯文全
邢小地
周淦
孙泽斌
刘曦
王冬
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Beihang University
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Beihang University
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Abstract

A correlated peak detection method of a double channel pn code acquisition system is disclosed. The method comprises four steps that: 1. Input spreading code data is divided into several data segments and the each data segment carries out correlation calculation with two-channel local pn code segments with same length; correlation information obtained through two main/auxiliary channel calculation is input into a shift register group; 2. The shift register group is formed by an upper shift register and a lower shift register, and when correlation calculation of one input data segment is completed and a new correlated peak is obtained, the shift register carries out operations of shifting and deblurring; 3. The correlation information is output; 4. After the above steps, an effective correlation peak sidelobe is filtered, the correlation information of the effective correlation peak is extracted so as to be used for local pn code reset position calculation; simultaneously, times of verifying the effective correlation peak is calculated, which provides a basis for an acquisition system to determine whether the correlation information is real.

Description

The correlation peak detecting of a kind of two-way acquiring pseudo code system
Technical field
The present invention relates to a kind of DSSS acquiring pseudo code technology that is applicable to satellite synthetical baseband equipment, particularly relate to correlation peak detecting based on a kind of two-way acquiring pseudo code system of local pseudo-code stack.This invention belongs to satellite synthetical baseband technical field of measurement and test.
Background technology
The terminal equipment that multinomial functions such as satellite synthetical baseband equipment is meant the range finding in the satellite telemetry communication system, tests the speed, remote control, remote measurement, number biographies organically combine; Be satellite ranging, tracking and remote control (Telemetry; Tracking and Command, the important component part that TT&C) setup test and satellite are tested at rail before task, the satellites transmits.Synthetical baseband equipment adopts unified DSSS observing and controlling system to carry out transfer of data.DSSS (Direct Sequence Spread Spectrum; DSSS) capture technique of pseudo-code signal is the key component in the spread spectrum synthetical baseband equipment intermediate-freuqncy signal processing unit; Because synthetical baseband equipment is general satellite instrumentation; Can carry out unified signal Synchronization operation to the remote control and the distance measuring signal of various uses, the two-way method for acquiring pseudo code based on local pseudo-code stack is adopted in therefore performance and the flexibility in order to take into account system.The two-way acquiring pseudo code has overcome the relevant peaks loss that the data hopping edge possibly brought when data-modulated was arranged, and is equivalent to same section input data are carried out twice relevant peaks checking; Local pseudo-code stack has solved the relevant peaks loss that the part correlation computing possibly bring when the range finding long code was caught; But also the data segment in effective relevant peaks data segment both sides has increased the identical relevant peaks (being referred to as effective relevant peaks secondary lobe) in position simultaneously, has brought difficulty for the reduction point calculating of true correlation detection of information and local pseudo-code.
Summary of the invention
1, purpose: the correlation peak detecting that the purpose of this invention is to provide a kind of two-way acquiring pseudo code system; To overcome the deficiency of prior art, it can cooperate the accurate judgement of described capture systems realization remote signal or distance measuring signal pseudo-code relevant peaks and catch fast.
2, technical scheme:
The correlation peak detecting of a kind of two-way acquiring pseudo code of the present invention system, these method concrete steps are following:
Step 1: at first the spreading code data with input are divided into several data segments, and the local pseudo-code section of each data segment and two-way equal length is carried out related operation.The length of data segment of carrying out related operation is identical with local pseudo-code section.The formula of its related operation is
Figure BDA0000133056500000011
l [] expression local data wherein; X [] expression input data; M is a data segment, length; C [] is the correlation computations result, and n is a discrete time.The local pseudo-code section of main road is that the chip of output is a starting point after resetting with local pseudo-code, the time domain stack of first pseudo-code section and second pseudo-code section; The local pseudo-code section of bypass is that the chip of output is a starting point after resetting with local pseudo-code, the time domain stack of three pseudo-code sections of second pseudo-code Duan Yudi.Relevant peaks among the related operation result, promptly the maximum point of absolute value among the related operation result if surpass detection threshold, then is referred to as effective relevant peaks.The relevant information input shift register group that major-minor two-way correlation computations is obtained.
Step 2: as shown in Figure 1, shift register group is made up of two shift registers up and down, and the top shift register comprises R 1, R 0, R -1And R -2Totally 4 registers, the bottom shift register comprises R 0', R -1' and R -2' totally 3 registers.Whenever the correlation computations of an input data segment is accomplished, when obtaining new relevant peaks, the shift register operation with ambiguity solution that once is shifted.
Wherein, the described relevant information of step 1 comprises: the position of (1) correlation peak in data segment is the reduction point of local pseudo-code; (2) numbering of the data segment at relevant peaks place; (3) validity of relevant peaks; (4) number of times verified of relevant peaks.Before the input shift register group, the number of times that relevant peaks was verified is 0.
Wherein, the operation with ambiguity solution that once is shifted of the described shift register of step 2, its concrete implementation procedure is following:
1. register shift and main road relevant information are provided with.The operation of top shift register comprises: R -1Data inputs R -2, R 0Data inputs R -1, R 1Data inputs R 0, main road relevant information input R 1The operation of bottom shift register comprises: R -1' data inputs R -2', R 0' data inputs R -1';
2. the bypass correlation peak is provided with.Reduction point and R with the bypass relevant peaks 0Reduction point relatively, if both are identical, and bypass relevant peaks and R 0Correlation peak-to-mean effective, then with R 0The checking number of times add 1; Otherwise, will import relevant information input R 0'.
3. main road peak value preliminary treatment.As shown in Figure 2ly be divided into 4 parts and carry out, (1) is R relatively -2, R -1And R 0It is effective and reduction point is identical whether to satisfy relevant peaks, if satisfy, then with R -2And R 0Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2And R 0Checking number of times sum add 2 again; If do not satisfy, then R is compared in (2) -2, R -1And R 0' whether to satisfy relevant peaks effective and reduction point is identical; If satisfy, then with R -2And R 0' relevant peaks be set to invalid, and with R - 1The checking number of times be set to R -1, R -2And R 0' checking number of times sum add 2 again; If do not satisfy, then R is compared in (3) -2', R -1And R 0' whether to satisfy relevant peaks effective and reduction point is identical, if satisfy, then with R -2' and R 0' relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' and R 0' checking number of times sum add 2 again; If do not satisfy, then R is compared in (4) -2', R -1And R 0It is effective and reduction point is identical whether to satisfy relevant peaks, if satisfy, then with R -2' and R 0Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' and R 0Checking number of times sum add 2 again; If do not satisfy, then finish the preliminary treatment of main road peak value.
4. bypass peak value preliminary treatment.With the R in the main road peak value pre-treatment step -1Replace with R -1', all the other operating processes are identical with the preliminary treatment of main road peak value.
5. main road peak value ambiguity solution.As shown in Figure 3, be divided into 2 parts and carry out, (1) is if R -2And R -1Correlation peak-to-mean effective and reduction point is identical, then judge R -2And R -1The position of reduction point in data segment, if R -2And R -1Reduction point be positioned at the first half of data segment, then with R -1Relevant peaks be set to invalid, and with R -2The checking number of times be set to R -2, R - 1Checking number of times sum add 1 again, if R -2And R -1Reduction point be positioned at the latter half of data segment, then with R -2Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2Checking number of times sum add 1 again; If R -2And R -1It is effective and reduction point is identical not satisfy relevant peaks, then (2) R relatively -2' and R -1It is effective and reduction point is identical whether to satisfy relevant peaks, if do not satisfy, then finishes the preliminary treatment of main road peak value, if satisfy, then judges R -2' and R -1The position of reduction point in data segment, if R -2' and R -1Reduction point be positioned at the first half of data segment, then with R -1Relevant peaks be set to invalid, and with R -2' the checking number of times be set to R -2', R -1Checking number of times sum add 1 again, if R -2' and R -1Reduction point be positioned at the latter half of data segment, then with R -2' relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' checking number of times sum add 1 again.
6. bypass peak value ambiguity solution.With the R in the main road peak value ambiguity solution step -1Replace with R -1', all the other operating processes are identical with the preliminary treatment of main road peak value.
Step 3: relevant information output.Selection is with R -2And R -2The effective relevant information output of ' middle correlation peak; If R -2With R -2' in peak value all effective, then will verify relevant information output that number of times is big, if both checking number of times are identical, then with R -2In relevant information output.If R -2With R -2' in peak value all invalid, then with R -2In relevant information output.
Step 4: through after the above several steps, effectively the relevant peaks secondary lobe is by filtering; Effectively the relevant information of relevant peaks is extracted, to calculate as local pseudo-code reset position; Simultaneously effectively the number of times verified of relevant peaks obtains statistics, for what capture systems was judged relevant information whether foundation is provided truly.
3, advantage and effect:
Can find out that from above description correlation peak detecting of the present invention has the following advantages:
(1) function is independent of other part of acquiring pseudo code system, and is simple in structure.
(2) overcome the fuzzy problem of effective relevant peaks that local pseudo-code stack brings, can in the middle of one group of relevant information of input, find real relevant information exactly.
(3) the relevant peaks validity of utilizing local pseudo-code stack to bring is fuzzy; Effective relevant peaks secondary lobe and bypass relevant peaks are verified number of times as checking and record to effective relevant peaks; The more relevant information of preferential output checking number of times; Therefore reduced the false alarm probability of capture systems, and whether foundation truly be provided for capture systems judgement relevant information.
(4) because the ambiguity solution operation time has verified to effective relevant peaks that so capture systems need not through repeatedly residently with the checking capturing information, reduced capture time.
Description of drawings
Fig. 1 shift register group structural representation;
Fig. 2 main road peak value pretreatment process figure;
Fig. 3 main road ambiguity solution flow chart;
The major-minor two-way input of Fig. 4 data segment, local data section and relevant peaks position view;
Fig. 5 (a) be relevant peaks when being positioned at the latter half of correlated results input data segment and local pseudo-code fragment position concern sketch map;
Fig. 5 (b) be relevant peaks when being positioned at the first half of correlated results input data segment and local pseudo-code fragment position concern sketch map;
Fig. 6 is a FB(flow block) of the present invention.
Embodiment
See Fig. 6, the correlation peak detecting of a kind of two-way capture systems based on the stack of local pseudo-code of the present invention, these method concrete steps are following:
Step 1: at first the spreading code data with input are divided into several data segments, and the local pseudo-code section of each data segment and two-way equal length is carried out related operation.The length of data segment of carrying out related operation is identical with local pseudo-code section.The formula of its related operation is
Figure BDA0000133056500000041
l [] expression local data wherein; X [] expression input data; M is a data segment, length; C [] is the correlation computations result, and n is a discrete time.The local pseudo-code section of main road is that the chip of output is a starting point after resetting with local pseudo-code, the time domain stack of first pseudo-code section and second pseudo-code section; The local pseudo-code section of bypass is that the chip of output is a starting point after resetting with local pseudo-code, the time domain stack of three pseudo-code sections of second pseudo-code Duan Yudi.Relevant peaks among the related operation result, promptly the maximum point of absolute value among the related operation result if surpass detection threshold, then is referred to as effective relevant peaks.The purpose of local pseudo-code section time domain stack is effective relevant peaks not to be caused under the prerequisite of decay, and the length of related operation is reduced by half.The relevant information input shift register group that major-minor two-way correlation computations is obtained.
Step 2: as shown in Figure 1, shift register group is made up of two shift registers up and down, and the top shift register comprises R 1, R 0, R -1And R -2Totally 4 registers, the bottom shift register comprises R 0', R -1' and R -2' totally 3 registers.Whenever the correlation computations of an input data segment is accomplished, when obtaining new relevant peaks, the shift register operation with ambiguity solution that once is shifted.
Wherein, the described relevant information of step 1 comprises: the position of (1) correlation peak in data segment is the reduction point of local pseudo-code; (2) numbering of the data segment at relevant peaks place; (3) validity of relevant peaks; (4) number of times verified of relevant peaks.Before the input shift register group, the number of times that relevant peaks was verified is 0.
Wherein, the operation with ambiguity solution that once is shifted of the described shift register of step 2, its concrete implementation procedure is following:
1. register shift and main road relevant information are provided with.The operation of top shift register comprises: R -1Data inputs R -2, R 0Data inputs R -1, R 1Data inputs R 0, main road relevant information input R 1The operation of bottom shift register comprises: R -1' data inputs R -2', R 0' data inputs R -1';
2. the bypass correlation peak is provided with.Reduction point and R with the bypass relevant peaks 0Reduction point relatively, if both are identical, and bypass relevant peaks and R 0Correlation peak-to-mean effective, then with R 0The checking number of times add 1; Otherwise, will import relevant information input R 0'.
3. main road peak value preliminary treatment.As shown in Figure 2ly be divided into 4 parts and carry out, (1) is R relatively -2, R -1And R 0It is effective and reduction point is identical whether to satisfy relevant peaks, if satisfy, then with R -2And R 0Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2And R 0Checking number of times sum add 2 again; If do not satisfy, then R is compared in (2) -2, R -1And R 0' whether to satisfy relevant peaks effective and reduction point is identical; If satisfy, then with R -2And R 0' relevant peaks be set to invalid, and with R - 1The checking number of times be set to R -1, R -2And R 0' checking number of times sum add 2 again; If do not satisfy, then R is compared in (3) -2', R -1And R 0' whether to satisfy relevant peaks effective and reduction point is identical, if satisfy, then with R -2' and R 0' relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' and R 0' checking number of times sum add 2 again; If do not satisfy, then R is compared in (4) -2', R -1And R 0It is effective and reduction point is identical whether to satisfy relevant peaks, if satisfy, then with R -2' and R 0Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' and R 0Checking number of times sum add 2 again; If do not satisfy, then finish the preliminary treatment of main road peak value.
4. bypass peak value preliminary treatment.With the R in the main road peak value pre-treatment step -1Replace with R -1', all the other operating processes are identical with the preliminary treatment of main road peak value.
5. main road peak value ambiguity solution.As shown in Figure 3, be divided into 2 parts and carry out, (1) is if R -2And R -1Correlation peak-to-mean effective and reduction point is identical, then judge R -2And R -1The position of reduction point in data segment, if R -2And R -1Reduction point be positioned at the first half of data segment, then with R -1Relevant peaks be set to invalid, and with R -2The checking number of times be set to R -2, R - 1Checking number of times sum add 1 again, if R -2And R -1Reduction point be positioned at the latter half of data segment, then with R -2Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2Checking number of times sum add 1 again; If R -2And R -1It is effective and reduction point is identical not satisfy relevant peaks, then (2) R relatively -2' and R -1It is effective and reduction point is identical whether to satisfy relevant peaks, if do not satisfy, then finishes the preliminary treatment of main road peak value, if satisfy, then judges R -2' and R -1The position of reduction point in data segment, if R -2' and R -1Reduction point be positioned at the first half of data segment, then with R -1Relevant peaks be set to invalid, and with R -2' the checking number of times be set to R -2', R -1Checking number of times sum add 1 again, if R -2' and R -1Reduction point be positioned at the latter half of data segment, then with R -2' relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' checking number of times sum add 1 again.
6. bypass peak value ambiguity solution.With the R in the main road peak value ambiguity solution step -1Replace with R -1', all the other operating processes are identical with the preliminary treatment of main road peak value.
Step 3: relevant information output.Selection is with R -2And R -2The effective relevant information output of ' middle correlation peak; If R -2With R -2' in peak value all effective, then will verify relevant information output that number of times is big, if both checking number of times are identical, then with R -2In relevant information output.If R -2With R -2' in peak value all invalid, then with R -2In relevant information output.
Step 4: through after the above several steps, effectively the relevant peaks secondary lobe is by filtering; Effectively the relevant information of relevant peaks is extracted, to calculate as local pseudo-code reset position; Simultaneously effectively the number of times verified of relevant peaks obtains statistics, for what capture systems was judged relevant information whether foundation is provided truly.
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
As shown in Figure 4; Suppose that k-1, k, k+1 and k+2 are continuous 4 input data segments; Wherein k input data segment has complete reflection in the local pseudo-code section of main road; K+1 input data segment has complete reflection in the local pseudo-code section of bypass; Simultaneously k-1 and k+1 data segment have incomplete reflection in the local pseudo-code section of main road, and k and k+2 data segment have incomplete reflection in the pseudo-code section of bypass this locality, so k+1 data segment of k data segment of main road and bypass can produce the complete correlation peak that the position is identical, data segment information is correct; The k-1 of main road can produce with k+2 data segment with the k of k+1 data segment and bypass that the position is identical, the decay correlation peak of data segment information errors, thereby has caused effective relevant peaks fuzzy.When signal to noise ratio height and relevant peaks position during near the data segment mid point, described continuous 4 input data segments have 6 effective relevant peaks input shift register groups at most; When low or relevant peaks position was near the data segment edge when signal to noise ratio, described continuous 4 input data segments had 4 effective relevant peaks input shift register groups at most.
Consider the situation of one tunnel local pseudo-code; Shown in Fig. 5 (a), Fig. 5 (b); The formula of its related operation is
Figure BDA0000133056500000061
l [] expression local data wherein; X [] expression input data, M is a data segment, length, c [] is the correlation computations result.Suppose that k-1, k and k+1 are continuous 3 input data segments; Wherein catch data segment k and can produce maximum correlation peak; It is correct through the reset position that calculates; When threshold value during near 1/2nd maximum correlation peak, k+1 data segment in (a) and the relevant peaks of k-1 data segment (b) be lower than threshold value from but invalid relevant peaks; (a) k-1 data segment in can produce effective relevant peaks in the same position of data segment k with k+1 data segment (b); But the reset position that calculates therefore must be with its filtering with respect to the proper reset position data segment that squinted forward and backward respectively.When continuous several data segments of catching can come ambiguity solution through the position of its peak value all when same position produces relevant peaks:
1. catch data segment and all produce relevant peaks at same position when continuous two, and relevant peaks is when being positioned at the latter half of correlated results, the peak value of second data segment is a true value;
2. catch data segment and all produce relevant peaks at same position when continuous two, and relevant peaks is when being positioned at the first half of correlated results, the peak value of first data segment is a true value;
3. when signal to noise ratio height and relevant peaks position during near the data segment mid point, might continuous three data segments all can produce effective relevant peaks of same position, the correlation peak in the middle of selecting this moment to be positioned at is as true value.
Example 1. high s/n ratio environment suppose that the input data segment, length is 8192 points, and the position of relevant peaks is 5000; As shown in Figure 4; Because the influence of modulating data hopping edge makes that the relevant peaks of k data segment of main road is invalid, the relevant peaks information of input shift register group is tabulated shown in 1 as follows like this, wherein 1 represents effective relevant peaks; The invalid relevant peaks of 0 representative, the position of 5 effective relevant peaks is identical.Supposing does not have effective relevant peaks in the shift register group when initial.Below be the actual detected data handling procedure, wherein only list the part that relates to effective relevant peaks in displacement and the operating process of ambiguity solution:
Data segment k-1 k k+1 k+2
Main road 1 0 1 0
Bypass 0 1 1 1
Table 1
1.k-1 data segment relevant information input: the main road relevant information input R of k-1 data segment 1
2.k data segment relevant information input: R 1Relevant information input R 0The bypass relevant peaks of k data segment is effective, its reduction point and R 0Reduction point identical, and R 0Relevant peaks information effective, so R 0The checking number of times add 1, equal 1.
3.k+1 data segment relevant information input: R 0Relevant information input R -1, R 1Relevant information input R 0, the main road relevant information input R of k+1 data segment 1The bypass relevant peaks of k+1 data segment is effective, but R 0Relevant peaks information invalid, therefore with the bypass relevant information input R of k+1 data segment 0'.
4.k+2 data segment relevant information input: R -1Relevant information input R -2, R 0Relevant information input R -1, R 1Relevant information input R 0, R 0' relevant information input R -1'; The bypass relevant peaks of k+2 data segment is effective, its reduction point and R 0Reduction point identical, and R 0Relevant peaks information effective, so R 0The checking number of times add 1, equal 1; R -2, R -1' and R 0Correlation peak-to-mean effective and reduction point is identical, therefore with R -2And R 0Relevant peaks be set to invalid, R -1' the checking number of times be set to R -2, R 0And R -1' checking number of times sum add 2, equal 4;
5.k+3 data segment data segment relevant information input: R -1' relevant information input R -2'; R -2' relevant information output.
Can know by last analysis, the shift register group filtering effective relevant peaks secondary lobe, exported correct result, i.e. the bypass relevant information of k+1 data segment, and accomplished the identical effective relevant peaks in other 4 positions as checking statistics to it.
Example 2. low signal-to-noise ratio environment; Suppose that the input data segment, length is 8192 points, the position of relevant peaks is 3000, and is as shown in Figure 4; Because the influence of modulating data hopping edge makes that the relevant peaks of k+1 data segment of bypass is invalid, and k-1 relevant peaks of main road and k relevant peaks of bypass are invalid.Shown in the following tabulation 2 of the relevant peaks information of input shift register group, wherein 1 represent effective relevant peaks like this, the invalid relevant peaks of 0 representative, the position of 3 effective relevant peaks is identical.Supposing does not have effective relevant peaks in the shift register group when initial.Below be the actual detected data handling procedure, wherein only list the part that relates to effective relevant peaks in displacement and the operating process of ambiguity solution:
Data segment k-1 k k+1 k+2
Main road 0 1 1 0
Bypass 0 0 0 1
Table 2
1.k-1 data segment relevant information input.
2.k data segment relevant information input: the main road relevant information input R of k data segment 1
3.k+1 data segment relevant information input: R 1Relevant information input R 0, the main road relevant information input R of k+1 data segment 1
4.k+2 data segment relevant information input: R 0Relevant information input R -1, R 1Relevant information input R 0The bypass relevant peaks of k+2 data segment is effective, its reduction point and R 0Reduction point identical, and R 0Relevant peaks information effective, so R 0The checking number of times add 1, equal 1.
5.k+3 data segment relevant information input: R -1Relevant information input R -2, R 0Relevant information input R -1, R 1Relevant information input R 0, because R -1And R -2Correlation peak-to-mean effective, reduction point is identical, and reduction point is at the first half of data segment, therefore with R -1Relevant peaks be set to invalid, R -2The checking number of times be set to R-2 and R -1Checking number of times sum add 1, equal 2; R -2Relevant information output.
Can know by last analysis, the shift register group filtering effective relevant peaks secondary lobe, exported correct result, i.e. the main road relevant information of k data segment, and accomplished the identical effective relevant peaks in other two positions as checking statistics to it.

Claims (3)

1. the correlation peak detecting of a two-way acquiring pseudo code system, it is characterized in that: these method concrete steps are following:
Step 1: at first the spreading code data with input are divided into several data segments, and the local pseudo-code section of each data segment and two-way equal length is carried out related operation; The length of data segment of carrying out related operation is identical with local pseudo-code section; The formula of its related operation is
Figure FDA0000133056490000011
l [] expression local data wherein; X [] expression input data; M is a data segment, length; C [] is the correlation computations result, and n is a discrete time; The local pseudo-code section of main road is that the chip of output is a starting point after resetting with local pseudo-code, the time domain stack of first pseudo-code section and second pseudo-code section; The local pseudo-code section of bypass is that the chip of output is a starting point after resetting with local pseudo-code, the time domain stack of three pseudo-code sections of second pseudo-code Duan Yudi; Relevant peaks among the related operation result, promptly the maximum point of absolute value among the related operation result if surpass detection threshold, then is referred to as effective relevant peaks, the relevant information input shift register group that major-minor two-way correlation computations is obtained;
Step 2: shift register group is made up of two shift registers up and down, and the top shift register comprises R 1, R 0, R -1And R -2Totally 4 registers, the bottom shift register comprises R 0', R -1' and R -2' totally 3 registers; Whenever the correlation computations of an input data segment is accomplished, when obtaining new relevant peaks, the shift register operation with ambiguity solution that once is shifted;
Step 3: relevant information output; Selection is with R -2And R -2' the effective relevant information output of middle correlation peak; If R -2With R -2' in peak value all effective, then will verify relevant information output that number of times is big, if both checking number of times are identical, then with R -2In relevant information output; If R -2With R -2' in peak value all invalid, then with R -2In relevant information output;
Step 4: through after the above several steps, effectively the relevant peaks secondary lobe is by filtering; Effectively the relevant information of relevant peaks is extracted, to calculate as local pseudo-code reset position; Simultaneously effectively the number of times verified of relevant peaks obtains statistics, for what capture systems was judged relevant information whether foundation is provided truly.
2. the correlation peak detecting of a kind of two-way acquiring pseudo code according to claim 1 system, it is characterized in that: the described relevant information of step 1 comprises: the position of (1) correlation peak in data segment is the reduction point of local pseudo-code; (2) numbering of the data segment at relevant peaks place; (3) validity of relevant peaks; (4) number of times verified of relevant peaks, before the input shift register group, the number of times that relevant peaks was verified is 0.
3. the correlation peak detecting of a kind of two-way acquiring pseudo code according to claim 1 system is characterized in that: the operation with ambiguity solution that once is shifted of the described shift register of step 2, and its concrete implementation procedure is following:
1) register shift and main road relevant information are provided with: the operation of top shift register comprises: R -1Data inputs R -2, R 0Data inputs R -1, R 1Data inputs R 0, main road relevant information input R 1The operation of bottom shift register comprises: R -1' data inputs R -2', R 0' data inputs R -1';
2) the bypass correlation peak is provided with; Reduction point and R with the bypass relevant peaks 0Reduction point relatively, if both are identical, and bypass relevant peaks and R 0Correlation peak-to-mean effective, then with R 0The checking number of times add 1; Otherwise, will import relevant information input R 0';
3) main road peak value preliminary treatment; Be divided into 4 parts and carry out, (a) compare R -2, R -1And R 0It is effective and reduction point is identical whether to satisfy relevant peaks, if satisfy, then with R -2And R 0Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2And R 0Checking number of times sum add 2 again; If do not satisfy, then (b) compares R -2, R -1And R 0' whether to satisfy relevant peaks effective and reduction point is identical; If satisfy, then with R -2And R 0' relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2And R 0' checking number of times sum add 2 again; If do not satisfy, then (c) compares R -2', R -1And R 0' whether to satisfy relevant peaks effective and reduction point is identical, if satisfy, then with R -2' and R 0' relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' and R 0' checking number of times sum add 2 again; If do not satisfy, then (d) compares R -2', R -1And R 0It is effective and reduction point is identical whether to satisfy relevant peaks, if satisfy, then with R -2' and R 0Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' and R 0Checking number of times sum add 2 again; If do not satisfy, then finish the preliminary treatment of main road peak value;
4) bypass peak value preliminary treatment; With the R in the main road peak value pre-treatment step -1Replace with R -1', all the other operating processes are identical with the preliminary treatment of main road peak value;
5) main road peak value ambiguity solution; Be divided into 2 parts and carry out, if (a) R -2And R -1Correlation peak-to-mean effective and reduction point is identical, then judge R -2And R -1The position of reduction point in data segment, if R -2And R -1Reduction point be positioned at the first half of data segment, then with R -1Relevant peaks be set to invalid, and with R -2The checking number of times be set to R -2, R -1Checking number of times sum add 1 again, if R -2And R -1Reduction point be positioned at the latter half of data segment, then with R -2Relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2Checking number of times sum add 1 again; If R -2And R -1It is effective and reduction point is identical not satisfy relevant peaks, then (b) R relatively -2' and R -1It is effective and reduction point is identical whether to satisfy relevant peaks, if do not satisfy, then finishes the preliminary treatment of main road peak value, if satisfy, then judges R -2' and R -1The position of reduction point in data segment, if R -2' and R -1Reduction point be positioned at the first half of data segment, then with R -1Relevant peaks be set to invalid, and with R -2' the checking number of times be set to R -2', R -1Checking number of times sum add 1 again, if R -2' and R -1Reduction point be positioned at the latter half of data segment, then with R -2' relevant peaks be set to invalid, and with R -1The checking number of times be set to R -1, R -2' checking number of times sum add 1 again;
6) bypass peak value ambiguity solution; With the R in the main road peak value ambiguity solution step -1Replace with R -1', all the other operating processes are identical with the preliminary treatment of main road peak value.
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