CN102901953A - Correlated peak sharpening method and device - Google Patents
Correlated peak sharpening method and device Download PDFInfo
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- CN102901953A CN102901953A CN2012103770146A CN201210377014A CN102901953A CN 102901953 A CN102901953 A CN 102901953A CN 2012103770146 A CN2012103770146 A CN 2012103770146A CN 201210377014 A CN201210377014 A CN 201210377014A CN 102901953 A CN102901953 A CN 102901953A
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Abstract
The invention discloses a correlated peak sharpening method. The method comprises the following steps: A. obtaining a self-correlation peak of a source signal, and performing normalization processing to the self-correlation peak, B. performing correlation operation to the source signal and reflected signal corresponding to the source signal so as to obtain a cross-correlation peak, and selecting the maximum peak of the cross-correlation peak value as a sharpened peak value, C. sharpening the current cross-correlation peak value according to the current sharpened peak value and the self-correlation peak subjected to normalization processing when the current sharpened peak value meets sharpening conditions, and recording the position of the sharpened peak value, and D. taking the cross-correlation peak subjected to normalization processing as the current cross-correlation peak, selecting a maximum peak value in the current cross-correlation peak as the sharpened peak value beside the peak value in the recorded position, and executing the step C. According to the sharpening method, the problems that all reflected signals influence one another can be solved, and correlated peaks of reflecting points with low power are covered by side lobes of correlated peaks of reflecting points with high power, so that all fault points can not be distinguished.
Description
Technical field
The application relates to field of measuring technique, particularly relates to a kind of relevant peaks sharpening method and device.
Background technology
In present generic failure (such as cable fault etc.) location (distance location) is realized, send signal specific by signal generating source to object under test, and gather the reflected signal of object under test, analyze the feature of object under test.
In analytic process, source signal (signal specific that namely sends) and reflected signal are carried out computing cross-correlation, can obtain the trouble spot to information such as the distance of signal generating source and phase amplitudes by the relevant peaks of analyzing these two signals, but, when object under test has a not only reflection spot (trouble spot), and each point reflection signal power difference is larger, range difference hour, each reflected signal phase mutual interference, the relevant peaks of the reflection spot that power is lower is covered by the relevant peaks secondary lobe of the larger reflection spot of power, can not accurately determine the position of each trouble spot.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides a kind of relevant peaks sharpening method and device, has solved because of each reflected signal phase mutual interference and can't tell the problem of each trouble spot.
Technical scheme is as follows:
A kind of relevant peaks sharpening method comprises:
A, obtain the self correlated peak of source signal, and described self correlated peak is done normalized;
B, described source signal and the reflected signal corresponding with described source signal are carried out computing cross-correlation, obtain the simple crosscorrelation peak, the peak-peak of selecting described simple crosscorrelation peak is the sharpening peak value;
C, when current sharpening peak value satisfies the sharpening condition, according to the self correlated peak after current sharpening peak value and the described normalization current simple crosscorrelation peak is carried out sharpening, and records the position of described sharpening peak value;
D, with the simple crosscorrelation peak after the sharpening as current simple crosscorrelation peak, and the peak-peak of selecting to locate except the sharpening peak of described record in the described current simple crosscorrelation peak is as sharpening peak value, execution in step C.
Said method, preferred, according to following formula described current simple crosscorrelation peak is carried out sharpening:
corr_seq1=corr_seq0-（P
*canc_seq）/N；
Wherein, corr_seq1 is the simple crosscorrelation peak after the sharpening; Corr_seq0 is current simple crosscorrelation peak; P is current sharpening peak value; Canc_seq is the self correlated peak after the normalization; N is the peak-peak of the self correlated peak after the described normalization.
Said method, preferred, described current sharpening peak value satisfies the sharpening condition and comprises:
Current sharpening peak value and default detection threshold are compared, and when described current sharpening peak value during greater than described detection threshold, described current sharpening peak value satisfies the sharpening condition.
Said method, preferred, also comprise:
When described sharpening peak value does not satisfy the sharpening condition, export current simple crosscorrelation peak:.
A kind of relevant peaks sharpening device comprises:
The normalization module is used for obtaining the self correlated peak of source signal, and described self correlated peak is done normalized;
Computing module is used for described source signal and the reflected signal corresponding with described source signal are carried out computing cross-correlation, obtains the simple crosscorrelation peak, and to select the peak-peak at described simple crosscorrelation peak be the sharpening peak value;
The sharpening module is used for step C, when current sharpening peak value satisfies the sharpening condition, according to the self correlated peak after current sharpening peak value and the described normalization current simple crosscorrelation peak is carried out sharpening, and records the position of current sharpening peak value; Step D, as current simple crosscorrelation peak, and the peak-peak of locating except described sharpening peak in the current simple crosscorrelation peak with described record is as sharpening peak value, execution in step C with the simple crosscorrelation peak after the sharpening.
Said apparatus, preferred, described sharpening module comprises:
Comparing unit is used for current sharpening peak value and the detection threshold of presetting are compared;
Computing unit is used for according to following formula described the first simple crosscorrelation peak being carried out sharpening when described comparing unit compares described sharpening peak value greater than described detection threshold:
corr_seq1=corr_seq0-（P
*canc_seq）/N；
Wherein, corr_seq1 is the simple crosscorrelation peak after the sharpening; Corr_seq0 is current simple crosscorrelation peak; P is current sharpening peak value; Canc_seq is the self correlated peak after the normalization; N is the peak-peak of the self correlated peak after the described normalization;
Selected cell be used for the simple crosscorrelation peak after the sharpening as current simple crosscorrelation peak, and the peak-peak of locating except described sharpening peak in the current simple crosscorrelation peak with described record is as the sharpening peak value.
Said apparatus, preferred, also comprise:
Output module is used for exporting described current simple crosscorrelation peak when described sharpening peak value does not satisfy the sharpening condition.
The technical scheme that is provided by above the embodiment of the present application as seen, a kind of relevant peaks sharpening method provided by the invention and device, by obtaining the self correlated peak of source signal, and the peak-peak at the simple crosscorrelation peak of source signal and the reflected signal corresponding with it is when satisfying default sharpening condition, according to described the first simple crosscorrelation peak, self correlated peak after described peak-peak and the described normalization carries out sharpening to described the first simple crosscorrelation peak, solved each reflected signal phase mutual interference, the relevant peaks of the reflection spot that power is lower is covered by the relevant peaks secondary lobe of the larger reflection spot of power, thereby can't tell the problem of each trouble spot.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present application, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, the accompanying drawing that the following describes only is some embodiment that put down in writing among the application, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The process flow diagram of a kind of relevant peaks sharpening method that Fig. 1 provides for the embodiment of the present application;
The process flow diagram of the another kind of relevant peaks sharpening method that Fig. 2 provides for the embodiment of the present application;
The self correlated peak of the source signal that Fig. 3 provides for the embodiment of the present application;
The source signal that Fig. 4 provides for the embodiment of the present application and the simple crosscorrelation peak of reflected signal;
The partial enlarged drawing at the simple crosscorrelation peak shown in Figure 4 that Fig. 5 provides for the embodiment of the present application;
Simple crosscorrelation peak after the sharpening first time that Fig. 6 provides for the embodiment of the present application;
The partial enlarged drawing at the simple crosscorrelation peak shown in Figure 6 that Fig. 7 provides for the embodiment of the present application;
Simple crosscorrelation after the sharpening second time that Fig. 8 provides for the embodiment of the present application;
The structural representation of a kind of relevant peaks sharpening device that Fig. 9 provides for the embodiment of the present application;
Figure 10 provide for the embodiment of the present application another in the structural representation of relevant peaks sharpening device.
For illustrated simple and clear, above accompanying drawing shows the common form of structure, and for fear of unnecessary fuzzy the present invention, can omit description and the details of known features and technology.In addition, the unit in the accompanying drawing is unnecessary proportionally draws.For example, can be with respect to the size of some unit in other unit enlarged drawings, thus help better to understand embodiments of the invention.Same numeral in the different accompanying drawings represents identical unit.
Term " first " in instructions and claims and the above-mentioned accompanying drawing, " second ", " the 3rd " " 4th " etc. (if exist) are be used to distinguishing similar unit, and needn't be used for describing specific order or precedence.The data that should be appreciated that such use suitably can exchanged in the situation, so as embodiments of the invention described herein for example can with except here illustrated or otherwise describe those order enforcement.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, be not necessarily limited to those unit in order to comprise process, method, system, product or the equipment of a series of unit, but can comprise clearly do not list or for other intrinsic unit of these processes, method, product or equipment.
Embodiment
In order to make those skilled in the art person understand better the application's scheme.Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment only is the application's part embodiment, rather than whole embodiment.Based on the embodiment among the application, those of ordinary skills are not making the every other embodiment that obtains under the creative work prerequisite, all should belong to the scope of the application's protection.
The process flow diagram of a kind of relevant peaks sharpening method that the embodiment of the present application provides comprises as shown in Figure 1:
Step S101: obtain the self correlated peak of source signal, and described self correlated peak is done normalized;
In this step, source signal is done auto-correlation computation, obtain the self correlated peak of source signal, the self correlated peak of source signal is done normalized;
Preferably, can use following method self correlated peak is carried out normalization:
With the amplitude of self correlated peak divided by a preset value; This preset value can be the peak value of the maximum peak of self correlated peak, can certainly be other value, is not specifically limited here.
That is to say that when self correlated peak was carried out normalization, the peak-peak of the self correlated peak after the normalization can be 1, can not be 1 also.
Step S102: described source signal and the reflected signal corresponding with described source signal are carried out computing cross-correlation, obtain the simple crosscorrelation peak, the peak-peak of selecting described simple crosscorrelation peak is the sharpening peak value;
By sending the reflected signal that signal specific (being source signal) gathers object under test to object under test, source signal and reflected signal are carried out computing cross-correlation, obtain the simple crosscorrelation peak of source signal and reflected signal, described signal specific can generate at random.
Step S103: when current sharpening peak value satisfies the sharpening condition, according to the self correlated peak after current sharpening peak value and the described normalization current simple crosscorrelation peak is carried out sharpening, and record the position of described sharpening peak value;
Preferably, current sharpening peak value and the detection threshold of presetting can be compared, if described current sharpening peak value, illustrates then that described current sharpening peak value satisfies the sharpening condition greater than described detection threshold, otherwise, illustrate that described current sharpening peak value does not satisfy the sharpening condition.Preferably, when current sharpening peak value satisfies the sharpening condition, can carry out sharpening to current simple crosscorrelation peak according to formula (1):
corr_seq1=corr_seq0-（P
*canc_seq）/N； （1）
Wherein, corr_seq1 is the simple crosscorrelation peak after the sharpening; Corr_seq0 is current simple crosscorrelation peak; P is current sharpening peak value; Canc_seq is the self correlated peak after the normalization; N is the peak-peak of the self correlated peak after the described normalization.
Preferably, the peak-peak of the self correlated peak after normalization is 1 o'clock, can also carry out sharpening to current simple crosscorrelation peak according to following formula:
corr_seq1=corr_seq0-P
*canc_seq； （2）
Wherein, corr_seq1 is the simple crosscorrelation peak after the sharpening; Corr_seq0 is current simple crosscorrelation peak; P is current sharpening peak value; Canc_seq is the self correlated peak after the normalization;
When carrying out sharpening, the amplitude at same position place is carried out the sharpening computing in self correlated peak and the simple crosscorrelation peak.
Step S104: with the simple crosscorrelation peak after the sharpening as current simple crosscorrelation peak, and with the peak-peak except the sharpening peak of described record, located in the described current simple crosscorrelation peak as sharpening peak value, execution in step S103.
The simple crosscorrelation peak after sharpening, the peak-peak of selecting to locate except the position, sharpening peak of aforementioned record is as new sharpening peak value, i.e. current sharpening peak value, and repeating step S103 then is not until current sharpening peak value satisfies the sharpening condition.A kind of relevant peaks sharpening method that the embodiment of the present application provides, by obtaining the self correlated peak of source signal, and when satisfying default sharpening condition at the simple crosscorrelation peak of source signal and the reflected signal corresponding with it, according to after the peak-peak at described simple crosscorrelation peak and the described normalization from
Relevant peaks is carried out sharpening to described simple crosscorrelation peak, has solved each reflected signal phase mutual interference, and the relevant peaks of the reflection spot that power is lower is covered by the relevant peaks secondary lobe of the larger reflection spot of power, thereby can't tell the problem of each trouble spot.
Please referring to Fig. 2, the process flow diagram of the another kind of relevant peaks sharpening method that Fig. 2 provides for the embodiment of the present application comprises:
Step S201: obtain the self correlated peak of source signal, and described self correlated peak is done normalized;
Step S202: described source signal and the reflected signal corresponding with described source signal are carried out computing cross-correlation, obtain the simple crosscorrelation peak, the peak-peak of selecting described simple crosscorrelation peak is the sharpening peak value;
Step S203: judge whether current sharpening peak value satisfies the sharpening condition, if so, then execution in step S204 namely carries out sharpening to current simple crosscorrelation peak; If not, then execution in step S205 namely exports current simple crosscorrelation peak;
Step S204: according to the self correlated peak after current sharpening peak value and the described normalization current simple crosscorrelation peak is carried out sharpening, and record the position of described sharpening peak value
Step S205: export current simple crosscorrelation peak;
For the validity of this programme is described, the below verifies this programme with instantiation:
Need to prove that the ordinate of all figure that provide in this example is the normalized value of right and wrong all; Among each figure, horizontal ordinate is the time, is specially the sampling period number of data, and for example, among Fig. 3, horizontal ordinate 4000 just represents the 4000th sampling period, supposes that the sampling period is 10ns, and so, horizontal ordinate 4000 is 4000*10ns=0.00004s with regard to the expression time; Ordinate is the relevant peaks range value of (comprising self correlated peak and simple crosscorrelation peak).
This relevant peaks sharpening method is verified at the intermodulation testing instrument, adds two reflection spots (trouble spot) at device under test, is respectively the first reflection spot and the second reflection spot; Wherein, the little 50dB of reflective power of echo power ratio second reflection spot of the first reflection spot, the loopback of the first reflection spot and the second reflection spot postpone to be separated by 30 sampling periods; In this example, detection threshold is that 20dB(is non-normalized);
In this example, the bandwidth of the signal specific of launching (being source signal) is 10MHz, and sample frequency is 245.76MHz, and it is carried out auto-correlation computation, obtains self correlated peak, as shown in Figure 3;
Simultaneously launch described signal specific (being source signal) to the first reflection spot and the second reflection spot, obtain reflected signal, and calculate the simple crosscorrelation peak of source signal and reflected signal, as shown in Figure 4;
For ease of observing, please referring to Fig. 5, Fig. 5 is the partial enlarged drawing at simple crosscorrelation peak shown in Figure 4, its amplification be figure around the peak-peak at simple crosscorrelation peak shown in Figure 4;
As seen from Figure 5, main peak (being the peak of amplitude maximum) only exceeded about 20dB than the relevant end of making an uproar, and can't determine position and the amplitude of second reflected signal (may be the reflected signal of the first reflection spot, also may be the reflected signal of second point) fully.
In simple crosscorrelation peak shown in Figure 4, peak-peak is about 82dB, and its position is 8445, application of formula (1), according to this peak-peak and self correlated peak shown in Figure 3 simple crosscorrelation peak shown in Figure 4 is carried out the sharpening first time, the simple crosscorrelation peak after the sharpening as shown in Figure 6;
Can find out that can obviously see second peak this moment, the end of making an uproar at simple crosscorrelation peak suppressed about 50dB (that is, main peak exceeded about 50dB than the relevant end of making an uproar);
Please referring to Fig. 7, Fig. 7 is the partial enlarged drawing at simple crosscorrelation peak shown in Figure 6; Its amplification be the figure around the peak-peak in the simple crosscorrelation peak shown in Figure 6;
According to the peak-peak except maximum peak shown in Figure 4 shown in Figure 6, and self correlated peak shown in Figure 3 carries out the sharpening second time to simple crosscorrelation peak shown in Figure 6, and the partial enlarged drawing at the simple crosscorrelation peak after the sharpening as shown in Figure 8;
Can find out that after the secondary sharpening, the relevant end of making an uproar is further suppressed again, can obviously see two peak values, the peak value at one of them peak is about 82dB, and its position is 8445, and the peak value at another peak is about 32dB, and the position is 8475; Through relatively, can see that the delay variance of setting on the position relationship of two maximum peaks and the hardware is consistent, amplitude difference is also consistent.The relevant peaks sharpening method that proof the embodiment of the present application provides is effective.
Please referring to Fig. 9, the structural representation of a kind of relevant peaks sharpening device that Fig. 9 provides for the embodiment of the present application comprises:
Sharpening module 903 is used for step S103, when current sharpening peak value satisfies the sharpening condition, according to the self correlated peak after current sharpening peak value and the described normalization current simple crosscorrelation peak is carried out sharpening, and records the position of current sharpening peak value; Step S104, as current simple crosscorrelation peak, and the peak-peak of locating except described sharpening peak in the current simple crosscorrelation peak with described record is as sharpening peak value, execution in step S103 with the simple crosscorrelation peak after the sharpening;
Concrete, sharpening module 903 can comprise:
Comparing unit 9031, computing unit 9032 and selected cell 9033;
Comparing unit 9031 is used for current sharpening peak value and the detection threshold of presetting are compared;
corr_seq1=corr_seq0-（P
*canc_seq）/N；
Wherein, corr_seq1 is the simple crosscorrelation peak after the sharpening; Corr_seq0 is current simple crosscorrelation peak; P is current sharpening peak value; Canc_seq is the self correlated peak after the normalization; N is the peak-peak of the self correlated peak after the described normalization;
The structural representation of the another kind of relevant peaks sharpening dress that the embodiment of the present application provides as shown in figure 10, on the basis of relevant peaks sharpening device shown in Figure 9, the relevant peaks sharpening device that the embodiment of the present application provides also comprises:
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses is difference with other embodiment.The above only is the application's embodiment; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection domain.
Claims (7)
1. a relevant peaks sharpening method is characterized in that, comprising:
A, obtain the self correlated peak of source signal, and described self correlated peak is done normalized;
B, described source signal and the reflected signal corresponding with described source signal are carried out computing cross-correlation, obtain the simple crosscorrelation peak, the peak-peak of selecting described simple crosscorrelation peak is the sharpening peak value;
C, when current sharpening peak value satisfies the sharpening condition, according to the self correlated peak after current sharpening peak value and the described normalization current simple crosscorrelation peak is carried out sharpening, and records the position of described sharpening peak value;
D, with the simple crosscorrelation peak after the sharpening as current simple crosscorrelation peak, and the peak-peak of selecting to locate except the sharpening peak of described record in the described current simple crosscorrelation peak is as sharpening peak value, execution in step C.
2. method according to claim 1 is characterized in that, according to following formula described current simple crosscorrelation peak is carried out sharpening:
corr_seq1=corr_seq0-（P*canc_seq）/N；
Wherein, corr_seq1 is the simple crosscorrelation peak after the sharpening; Corr_seq0 is current simple crosscorrelation peak; P is current sharpening peak value; Canc_seq is the self correlated peak after the normalization; N is the peak-peak of the self correlated peak after the described normalization.
3. method according to claim 1 is characterized in that, described current sharpening peak value satisfies the sharpening condition and comprises:
Current sharpening peak value and default detection threshold are compared, and when described current sharpening peak value during greater than described detection threshold, described current sharpening peak value satisfies the sharpening condition.
4. the described method of any one is characterized in that according to claim 1-3, also comprises:
When described sharpening peak value does not satisfy the sharpening condition, export current simple crosscorrelation peak.
5. a relevant peaks sharpening device is characterized in that, comprising:
The normalization module is used for obtaining the self correlated peak of source signal, and described self correlated peak is done normalized;
Computing module is used for described source signal and the reflected signal corresponding with described source signal are carried out computing cross-correlation, obtains the simple crosscorrelation peak, and to select the peak-peak at described simple crosscorrelation peak be the sharpening peak value;
The sharpening module is used for step C, when current sharpening peak value satisfies the sharpening condition, according to the self correlated peak after current sharpening peak value and the described normalization current simple crosscorrelation peak is carried out sharpening, and records the position of current sharpening peak value; Step D, as current simple crosscorrelation peak, and the peak-peak of locating except described sharpening peak in the current simple crosscorrelation peak with described record is as sharpening peak value, execution in step C with the simple crosscorrelation peak after the sharpening.
6. device according to claim 5 is characterized in that, described sharpening module comprises:
Comparing unit is used for current sharpening peak value and the detection threshold of presetting are compared;
Computing unit is used for according to following formula described the first simple crosscorrelation peak being carried out sharpening when described comparing unit compares described sharpening peak value greater than described detection threshold:
corr_seq1=corr_seq0-（P*canc_seq）/N；
Wherein, corr_seq1 is the simple crosscorrelation peak after the sharpening; Corr_seq0 is current simple crosscorrelation peak; P is current sharpening peak value; Canc_seq is the self correlated peak after the normalization; N is the peak-peak of the self correlated peak after the described normalization;
Selected cell be used for the simple crosscorrelation peak after the sharpening as current simple crosscorrelation peak, and the peak-peak of locating except described sharpening peak in the current simple crosscorrelation peak with described record is as the sharpening peak value.
7. according to claim 5 or 6 described devices, it is characterized in that, also comprise:
Output module is used for exporting described current simple crosscorrelation peak when described sharpening peak value does not satisfy the sharpening condition.
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