CN118051725A - On-line suppression method and device for low-frequency interference signals, electronic equipment and medium - Google Patents
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Abstract
The invention provides an on-line suppression method, device, electronic equipment and medium for low-frequency interference signals, belonging to the technical field of signal processing, wherein the method comprises the following steps: acquiring original signals of each sensing partition demodulated by a distributed acoustic wave sensing system; coarse screening is carried out on the original signals of each sensing partition based on the same time window variable and the same amplitude variable, so that coarse screening signals are obtained; determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters, and determining a rescreening signal; subtracting the first data point in the corresponding section from the effective signal of each section in the rescreening signal to obtain a real vibration sensing signal. The invention processes the original signal by utilizing the signal period difference, realizes the undistorted extraction of the vibration signal from the interference signal and the system noise signal, and realizes the purpose of suppressing the low-frequency interference signal in the sensing optical fiber of the distributed acoustic wave sensing system.
Description
Technical Field
The present invention relates to the field of signal processing technologies, and in particular, to an online suppression method, an online suppression device, an electronic device, and a medium for a low-frequency interference signal.
Background
In a distributed acoustic wave sensing system based on a phase sensitive type optical time domain reflection technology, local vibration on a sensing optical fiber causes the change of optical path length, so that the difference of the phases of optical wave signals before and after a disturbance position is caused, and the demodulation of the phase difference before and after the vibration position is realized by injecting coherent detection pulse optical signals into the sensing optical fiber and utilizing the coherent effect of backward scattering/reflection signals in the sensing optical fiber, so that the restoration of external vibration signals is realized.
The vibration signals on the time and space domains sensed by the sensing optical fibers can realize functions such as vehicle positioning, real-time state monitoring, structural health monitoring and the like in the rail transit field, has the advantages of long detection distance, high detection sensitivity, electromagnetic interference resistance and the like, and is widely applied to practical engineering projects at home and abroad.
However, the detection pulse optical signal is extremely easy to be interfered by frequency drift and temperature fluctuation of a light source in the generation process, the sensing optical fiber is also interfered by the temperature of the environment, the frequency of the interference signals is low (sub-hertz), the intensity of the interference signals is random, and finally, the interference signals are aliased in an external vibration reduction result to influence the identification and judgment of the follow-up vibration signals.
Disclosure of Invention
In view of the foregoing, it is desirable to provide a method, an apparatus, an electronic device, and a medium for on-line suppression of low-frequency interference signals, so as to achieve the purpose of suppressing the low-frequency interference signals in the sensing optical fiber of the distributed acoustic wave sensing system.
In order to achieve the above object, in one aspect, the present invention provides an on-line suppression method for a low frequency interference signal, including:
Acquiring original signals of each sensing partition demodulated by a distributed acoustic wave sensing system;
Coarse screening is carried out on the original signals of all the sensing subareas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals;
Determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen interference signals to obtain rescreen signals;
Subtracting the first data point in the section from each section effective signal in the rescreening signal to obtain a real vibration sensing signal.
In one possible implementation manner, the coarse screening is performed on the original signals of the sensing partitions based on the same time window variable and the same amplitude variable to screen out the interference signals, so as to obtain coarse screened signals, which includes:
Inputting the original signals of each sensing partition into a plurality of first coarse screening modules configured with the same time window variable, so as to respectively determine the noise fluctuation range of the distributed acoustic wave sensing system based on the plurality of first coarse screening modules and the same time window variable, and performing coarse screening on the original signals of each sensing partition based on the noise fluctuation range to screen out interference signals to obtain a primary selection signal;
And inputting the primary selection signal into a plurality of second coarse screening modules configured with the same amplitude variable so as to screen effective signals from the primary selection signal based on the plurality of second coarse screening modules to obtain the coarse screening signal.
In one possible implementation manner, the first coarse screening module is configured to determine a characteristic value corresponding to the original signal based on a time window variable, and determine a noise fluctuation range of the distributed acoustic wave sensing system based on the characteristic value.
In one possible implementation manner, the second coarse screening module is configured to determine that the primary selection signal is a valid signal if an absolute value of a difference between the primary selection signal and a feature value is greater than an amplitude variable.
In one possible implementation, the determining the signal duration and the signal interval time of each segment of the coarse-screened signal includes:
Sequentially acquiring each data point in the coarse screening signal;
determining a failure mark of each section of the coarse screen signal based on the data points, and determining a starting time point and an ending time point of each section of the coarse screen signal based on the failure mark;
And determining the signal duration and the signal interval time of each section of the signals in the coarse screening signal based on the starting time point and the ending time point of each section of the signals in the coarse screening signal.
In one possible implementation manner, the comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen the interference signal to obtain a rescreened signal includes:
And screening the signals corresponding to the reconfigurable parameters with the signal duration longer than or equal to the preset numerical value or with the signal interval time shorter than the preset numerical value in the coarse screening signals to rescreen interference signals again, so as to obtain rescreen signals.
In one possible implementation, subtracting the first data point in the segment from each segment effective signal in the re-screening signal to obtain a real vibration sensing signal includes:
Inputting the rescreening signal into a first signal extraction module to determine a start time point and an end time point of each section of effective signal in the rescreening signal based on the first signal extraction module;
Inputting the rescreening signal and the starting time point and the ending time point of each section of effective signal to a second signal extraction module so as to subtract the first data point in the section from each section of effective signal in the rescreening signal based on the second signal extraction module by utilizing the starting time point and the ending time point of each section of effective signal to obtain the real vibration sensing signal.
On the other hand, the invention also provides an on-line suppression device for the low-frequency interference signal, which comprises the following components:
the acquisition module is used for acquiring the original signals of each sensing partition demodulated by the distributed acoustic wave sensing system;
the coarse screening module is used for coarse screening the original signals of the sensing subareas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals;
the rescreening module is used for determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters so as to rescreen interference signals again and obtain rescreening signals;
And the extraction module is used for subtracting the first data point in the section from each section of effective signal in the rescreening signal to obtain a real vibration sensing signal.
In another aspect, the present invention also provides an electronic device comprising a memory and a processor, wherein,
The memory is used for storing programs;
the processor is coupled to the memory, and is configured to execute the program stored in the memory, so as to implement the method for on-line suppression of a low-frequency interference signal according to any one of the above.
In another aspect, the present invention also provides a non-transitory computer readable storage medium, on which a computer program is stored, which when executed by a processor, implements the method for on-line suppression of low frequency interference signals as described in any one of the above.
The beneficial effects of the implementation mode are that: according to the on-line suppression method, device, electronic equipment and medium for the low-frequency interference signals, disclosed by the invention, after the original signals of all sensing partitions are subjected to coarse screening based on the same time window variable and the same amplitude variable, the signals are subjected to rescreening based on the signal duration time, the signal interval time and the preset numerical reconfigurable parameter, the first data point in each section of effective signals in the rescreened signals is subtracted to obtain the real vibration sensing signals, the original signals are processed by utilizing the signal period difference, the undistorted extraction of the vibration signals from the interference signals and the system noise signals is realized, the advantages of small calculated amount, simple logic, no need of complex hardware configuration and the like are achieved, and the whole data processing process adopts a pipeline processing mode, so that the on-line suppression of the low-frequency interference signals in a distributed acoustic wave sensing system is ensured.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of an embodiment of an on-line suppression method for low frequency interference signals according to the present invention;
FIG. 2 is a diagram of raw signal data in one embodiment provided by the present invention;
FIG. 3 is a diagram showing the effect of a conventional filtering method on a portion of the data of the sensor sector of FIG. 2 according to the present invention;
FIG. 4 is a schematic diagram of a portion of the data from the sensor sector of FIG. 2 provided by the present invention after coarse screening using the method of the present invention;
FIG. 5 is a schematic diagram of a portion of the data from the sensor sector of FIG. 2 after rescreening and signal extraction using the method of the present invention;
FIG. 6 is a graph showing the effect of the data in FIG. 2 after on-line suppression by the method of the present invention;
fig. 7 is a flowchart of another embodiment of an on-line suppression method for low frequency interference signals according to the present invention;
FIG. 8 is a schematic block diagram illustrating an embodiment of an on-line suppression device for low frequency interference signals according to the present invention;
Fig. 9 is a schematic structural diagram of an embodiment of an electronic device provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
The terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or modules is not necessarily limited to those steps or modules that are expressly listed or inherent to such process, method, article, or device.
The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed according to the time/logic sequence indicated by the naming or numbering, and the named or numbered flow steps may change the execution order according to the technical purpose to be achieved, so long as the same or similar technical effects can be achieved.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention provides an on-line suppression method and device for low-frequency interference signals, electronic equipment and medium, and the method and device are described below.
As shown in fig. 1, the present invention provides an on-line suppression method for low-frequency interference signals, which includes:
s101, acquiring original signals of each sensing partition demodulated by a distributed acoustic wave sensing system;
s102, carrying out coarse screening on the original signals of all the sensing areas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals;
s103, determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen interference signals to obtain rescreen signals;
s104, subtracting the first data point in the section from each section effective signal in the rescreening signal to obtain a real vibration sensing signal.
It can be understood that the original signals of each sensing zone demodulated by the distributed acoustic wave sensing system are independent from each other, as shown in fig. 2, the original signals of the road detected by the sensing zones of 5 adjacent 50 meters are sampled at 100Hz (i.e. 0.01 second in time resolution), and the sensing zones are 5 meters long. From the figure it can be seen that the original signal of each sensing zone is aliased by a larger low frequency interference signal, and the strength of this low frequency interference signal is unpredictable over time. Therefore, the low-frequency interference signal is removed by digital (high-pass) filtering, and fig. 3 shows a part of the original signal of the first sensing region and the signal after passing through an IIR filter (infinite impulse response filter) and a zero-phase IIR filter (LPIIR filter). The existing IIR filter has strong real-time processing capability, but has larger group delay, signals are easy to distort, and the LPIIR filter with phase compensation reduces the distortion degree of the signals, but has high calculation time complexity and is difficult to apply online.
The invention provides an on-line suppression method for low-frequency interference signals in a distributed acoustic wave sensing system, which utilizes the signal period difference to process original signals, realizes the undistorted extraction of vibration signals from interference signals and system noise signals, has the advantages of small calculated amount, simple logic, no need of complex hardware configuration and the like, and ensures the on-line suppression of the low-frequency interference signals in the distributed acoustic wave sensing system by adopting a pipeline processing mode in the whole data processing process. The method specifically comprises three main steps of coarse screening, heavy screening and signal extraction.
The raw signals of each sensing partition demodulated by the distributed acoustic wave sensing system, namely vibration signals which are mixed with low-frequency interference signals, are roughly screened, the signal processing of each sensing partition is independent, the raw signals of the single sensing partition can be expressed as v (n) along with time, and n=1, 2,3, … and n are discrete time variables.
In a distributed acoustic wave sensing system, the variability of each sensing partition causes random fluctuations in the intensity of the original signal, and the use of the same WinS (time window variable) and AmpT (amplitude variable) values for all partitions will cause erroneous identification of valid and invalid signals in the nv (n) signal (i.e., the coarse-screened signal) after coarse screening of some sensing partitions, as shown in fig. 4. The separate configuration of WinS and AmpT values for each partition will result in increased system complexity due to the large number of sensing partitions. In order to solve the problem of error identification of effective signals and ineffective signals in nv (n) data, the invention re-screens the signals nv (n) after coarse screening, and corrects the nv (n) data by using the signal duration time to obtain np (n) (i.e. re-screened signals).
The rescreened signal np (n) contains the true vibration information and the low frequency disturbance information, which can be considered approximately as a straight line for the duration of the vibration signal due to the higher frequency and shorter duration of the vibration signal, as shown in fig. 5. Thus, the real vibration information is obtained by subtracting the first data point in each segment from the effective signal of the segment. The original signal shown in fig. 2 is processed by the method provided by the invention, and the corresponding effect diagram is shown in fig. 6.
In some embodiments, referring to fig. 7, the coarse screening the original signals of the sensing partitions based on the same time window variable and the same amplitude variable to screen out the interference signals, to obtain coarse screened signals, including:
Inputting the original signals of each sensing partition into a plurality of first coarse screening modules configured with the same time window variable, so as to respectively determine the noise fluctuation range of the distributed acoustic wave sensing system based on the plurality of first coarse screening modules and the same time window variable, and performing coarse screening on the original signals of each sensing partition based on the noise fluctuation range to screen out interference signals to obtain a primary selection signal;
And inputting the primary selection signal into a plurality of second coarse screening modules configured with the same amplitude variable so as to screen effective signals from the primary selection signal based on the plurality of second coarse screening modules to obtain the coarse screening signal.
Further, the first coarse screening module is configured to determine a feature value corresponding to the original signal based on a time window variable, and determine a noise fluctuation range of the distributed acoustic wave sensing system based on the feature value.
It is understood that the characteristic value is mainly used for determining the noise fluctuation range of the distributed acoustic wave sensing system, and the characteristic value may be a measurement value such as a maximum value, a minimum value, a median value or an average value of continuous time window variable data in the original signal.
The second coarse screening module is configured to determine that the primary selection signal is an effective signal when an absolute value of a difference between the primary selection signal and the feature value is greater than an amplitude variable.
The original signal v (n) first enters a first coarse screening module that contains a flexibly configurable time window variable WinS. The first coarse screening module obtains the characteristic value of v (n) in WinS in real time to determine the noise fluctuation range of the distributed acoustic wave sensing system in practical application, for example, the maximum value Wmax and the minimum value Wmin of v (n) in WinS are taken as the characteristic value 1 and the characteristic value 2 respectively. In order to avoid interference of the signal with the characteristic value acquisition, winS values are smaller than the vibration signal period.
As can be seen from fig. 3, the period of the vibration signal is often greater than 0.1 seconds, so WinS can be made 10, i.e., 0.1 seconds. The first coarse screening module slides and acquires the maximum value Wmax and the minimum value Wmin of the signal within 0.1 second, and the amplitude of the original signal and the system time delay are not obviously influenced.
Each data passing through the first coarse screening module enters a second coarse screening module in which a flexibly configurable amplitude variable AmpT is defined. The second coarse screening module performs logic judgment on each received data, reserves effective vibration signals (effective signals) for backward transmission, and marks invalid signals (such as null), wherein AmpT is an amplitude threshold value for distinguishing the vibration signals from a noise fluctuation range of the distributed acoustic wave sensing system, when the absolute value of v (n) -Wmin or the absolute value of v (n) -Wmax is greater than AmpT, v (n) is the effective signal, and the intermediate variable nv (n) =v (n), otherwise, v (n) is the invalid signal (noise signal), and nv (n) =null.
And each data passing through the first coarse screening module enters the second coarse screening module, and the distinction between the vibration signal and the system noise is realized by judging whether the difference value between the maximum value Wmax and the minimum value Wmin of the current data point and the 0.1 second historical signal is larger than a certain threshold AmpT.
AmpT determination method: the system noise signal amplitude is manually confirmed for a period of time of 0.1 seconds, as shown in fig. 3, the system noise fluctuates by about 0.2rad, so when the data value newly demodulated by the system is 0.1rad higher than Wmax or 0.1rad lower than Wmin, the data value is judged to be a non-noise signal, so AmpT takes 0.1rad.
In some embodiments, the determining the signal duration and signal interval time of each segment of the coarse screened signal comprises:
Sequentially acquiring each data point in the coarse screening signal;
determining a failure mark of each section of the coarse screen signal based on the data points, and determining a starting time point and an ending time point of each section of the coarse screen signal based on the failure mark;
And determining the signal duration and the signal interval time of each section of the signals in the coarse screening signal based on the starting time point and the ending time point of each section of the signals in the coarse screening signal.
Further, comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen the interference signal to obtain a rescreened signal, including:
And screening the signals corresponding to the reconfigurable parameters with the signal duration longer than or equal to the preset numerical value or with the signal interval time shorter than the preset numerical value in the coarse screening signals to rescreen interference signals again, so as to obtain rescreen signals.
It can be understood that the first rescreening module sequentially acquires each data point in the coarsely screened signal nv (n), acquires a start time point and an end time point of each section of the valid signal and the invalid signal according to the invalid flag, and transmits the start time point and the end time point to the second rescreening module, wherein the start0 and the end0 respectively represent the start time point and the end time point of one section of the valid signal, and the start1 and the end1 respectively represent the start time point and the end time point of one section of the invalid signal, as shown in fig. 4.
In practical applications, the duration (start 0: end 0) of the vibration signal and the interval time (start 1: end 1) of the vibration signal both exist for a reasonable time, so the second rescreening module compares the duration and interval time of the vibration signal with the parameter TimThre with reconfigurable values, and if the duration of the vibration signal is shorter, that is, end0-start0 is less than TimThre, the signal is not a real vibration signal, so np (start 0: end 0) =null; if the vibration signal interval is short, that is, end1-start1 is smaller than TimThre, it indicates that the signal is misjudged as an invalid signal before the signal is sent, so that np (start 1: end 1) =v (start 1: end 1); np (n) =nv (n) outside of the above two cases.
Since the duration of the vibration signal (start 0: end 0) is affected by the sensing zone length and the running speed, the duration of the vehicle passing through a single zone is greater than 0.3 seconds, taking a 5m zone length and a 120km/h speed as an example. The interval time (start 1: end 1) of the vibration signal is generally affected by the distance between two adjacent vehicles and the driving speed, and for example, the distance between 10 meters and the speed of 100km/h are about 0.36 seconds. The threshold time TimThre is set to 0.1 seconds for judging the rationality of the abnormal-duration vibration signal and the abnormal-interval-time invalidation signal. I.e., 0 is less than end0-start0 is less than TimThre, np (start 0: end 0) =null; when 0 is smaller than end1-start1 is smaller than TimThre, np (start 1: end 1) =v (start 1: end 1); np (n) =nv (n) outside of the above two cases.
In some embodiments, subtracting the first data point within a segment from each segment effective signal in the re-screening signal results in a true vibration sensing signal, comprising:
Inputting the rescreening signal into a first signal extraction module to determine a start time point and an end time point of each section of effective signal in the rescreening signal based on the first signal extraction module;
Inputting the rescreening signal and the starting time point and the ending time point of each section of effective signal to a second signal extraction module so as to subtract the first data point in the section from each section of effective signal in the rescreening signal based on the second signal extraction module by utilizing the starting time point and the ending time point of each section of effective signal to obtain the real vibration sensing signal.
It can be understood that the first signal extraction module sequentially acquires each data point in the re-screened signal np (n), acquires the start time point start2 and the end time point end2 of each valid signal according to the failure flag, and transmits the data points to the second signal extraction module.
After the second signal extraction module obtains the values of the start2 and the end2, the np (start 2: end 2) is subtracted by the np (start 2) to obtain real vibration data z (start 2: end 2) contained in each section of effective signal, and the signal np (n) outside the effective signal is directly transmitted to z (n). And z (n) is the vibration sensing signal after final processing.
In summary, the method for on-line suppression of low-frequency interference signals provided by the invention comprises the following steps: acquiring original signals of each sensing partition demodulated by a distributed acoustic wave sensing system; coarse screening is carried out on the original signals of all the sensing subareas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals; determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen interference signals to obtain rescreen signals; subtracting the first data point in the section from each section effective signal in the rescreening signal to obtain a real vibration sensing signal.
The invention provides an on-line suppression method for low-frequency interference signals in a distributed acoustic wave sensing system, which is characterized in that after coarse screening is carried out on original signals of all sensing areas based on the same time window variable and the same amplitude variable, signal rescreening is carried out based on signal duration time, signal interval time and preset numerical reconfigurable parameters, a first data point in each section of effective signal in the rescreened signals is subtracted to obtain real vibration sensing signals, the original signals are processed by utilizing signal period differences, undistorted extraction of vibration signals from interference signals and system noise signals is realized, and the method has the advantages of small calculated amount, simple logic, no need of complex hardware configuration and the like. The method provided by the invention can reduce the influence of low-frequency interference signals, does not distort vibration signals, and can simultaneously realize real-time online processing, so as to solve the technical problems of high system complexity, high hardware cost, signal distortion and difficult online processing in the prior art.
As shown in fig. 8, the present invention further provides an on-line suppression device 800 for low-frequency interference signals, which includes:
The acquisition module 801 is configured to acquire an original signal of each sensing partition demodulated by the distributed acoustic wave sensing system;
The coarse screening module 802 is configured to perform coarse screening on the original signals of the sensing partitions based on the same time window variable and the same amplitude variable, so as to screen out the interference signals, and obtain coarse screened signals;
a rescreening module 803, configured to determine a signal duration and a signal interval time of each segment of the coarse-screened signal, and compare the signal duration and the signal interval time with preset numerical reconfigurable parameters, so as to rescreen the interference signal, and obtain a rescreened signal;
And the extraction module 804 is configured to subtract the first data point in the segment from each segment of the effective signal in the re-screening signal to obtain a real vibration sensing signal.
The on-line suppression device for low-frequency interference signals provided in the foregoing embodiments may implement the technical solutions described in the embodiments of the on-line suppression method for low-frequency interference signals, and the specific implementation principles of the foregoing modules or units may refer to corresponding contents in the embodiments of the on-line suppression method for low-frequency interference signals, which are not described herein again.
As shown in fig. 9, the present invention further provides an electronic device 900 accordingly. The electronic device 900 comprises a processor 901, a memory 902 and a display 903. Fig. 9 shows only some of the components of the electronic device 900, but it should be understood that not all of the illustrated components are required to be implemented and that more or fewer components may be implemented instead.
The memory 902 may be an internal storage unit of the electronic device 900, such as a hard disk or memory of the electronic device 900, in some embodiments. The memory 902 may also be an external storage device of the electronic device 900 in other embodiments, such as a plug-in hard disk provided on the electronic device 900, a smart memory card (SMART MEDIA CARD, SMC), a Secure Digital (SD) card, a flash memory card (FLASH CARD), or the like.
Further, the memory 902 may also include both internal storage units and external storage devices of the electronic device 900. The memory 902 is used for storing application software and various types of data for installing the electronic device 900.
Processor 901 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for running program code or processing data stored in memory 902, such as the on-line suppression of low frequency interference signals of the present invention.
The display 903 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch device, or the like in some embodiments. The display 903 is used to display information at the electronic device 900 and to display a visual user interface. The components 901-903 of the electronic device 900 communicate with each other over a system bus.
In some embodiments of the present invention, when the processor 901 executes the on-line suppression program of the low frequency interference signal in the memory 902, the following steps may be implemented:
Acquiring original signals of each sensing partition demodulated by a distributed acoustic wave sensing system;
Coarse screening is carried out on the original signals of all the sensing subareas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals;
Determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen interference signals to obtain rescreen signals;
Subtracting the first data point in the section from each section effective signal in the rescreening signal to obtain a real vibration sensing signal.
It should be understood that: the processor 901 may perform other functions in addition to the above functions when executing the on-line suppression program of the low frequency interference signal in the memory 902, and in particular, reference may be made to the description of the corresponding method embodiments above.
Further, the type of the electronic device 900 is not particularly limited in the embodiments of the present invention, and the electronic device 900 may be a portable electronic device such as a mobile phone, a tablet computer, a personal digital assistant (personal digitalassistant, PDA), a wearable device, a laptop computer (laptop), etc. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices that carry IOS, android, microsoft or other operating systems. The portable electronic device described above may also be other portable electronic devices, such as a laptop computer (laptop) or the like having a touch-sensitive surface, e.g. a touch panel. It should also be appreciated that in other embodiments of the invention, electronic device 900 may not be a portable electronic device, but rather a desktop computer having a touch-sensitive surface (e.g., a touch panel).
In yet another aspect, the present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, is implemented to perform a method for on-line suppression of a low frequency interference signal provided by the above methods, the method comprising:
Acquiring original signals of each sensing partition demodulated by a distributed acoustic wave sensing system;
Coarse screening is carried out on the original signals of all the sensing subareas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals;
Determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen interference signals to obtain rescreen signals;
Subtracting the first data point in the section from each section effective signal in the rescreening signal to obtain a real vibration sensing signal.
Those skilled in the art will appreciate that all or part of the flow of the methods of the embodiments described above may be accomplished by way of a computer program that instructs associated hardware, and that the program may be stored in a computer readable storage medium. The computer readable storage medium is a magnetic disk, an optical disk, a read-only memory or a random access memory.
The method, the device, the electronic equipment and the medium for on-line suppression of the low-frequency interference signal provided by the invention are described in detail, and specific examples are applied to illustrate the principle and the implementation mode of the invention, and the description of the above examples is only used for helping to understand the method and the core idea of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.
Claims (10)
1. An on-line suppression method for a low-frequency interference signal is characterized by comprising the following steps:
Acquiring original signals of each sensing partition demodulated by a distributed acoustic wave sensing system;
Coarse screening is carried out on the original signals of all the sensing subareas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals;
Determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen interference signals to obtain rescreen signals;
Subtracting the first data point in the section from each section effective signal in the rescreening signal to obtain a real vibration sensing signal.
2. The method for on-line suppression of low-frequency interference signals according to claim 1, wherein the coarse screening is performed on the original signals of the sensing partitions based on the same time window variable and the same amplitude variable to screen out the interference signals to obtain coarse screened signals, and the method comprises the following steps:
Inputting the original signals of each sensing partition into a plurality of first coarse screening modules configured with the same time window variable, so as to respectively determine the noise fluctuation range of the distributed acoustic wave sensing system based on the plurality of first coarse screening modules and the same time window variable, and performing coarse screening on the original signals of each sensing partition based on the noise fluctuation range to screen out interference signals to obtain a primary selection signal;
And inputting the primary selection signal into a plurality of second coarse screening modules configured with the same amplitude variable so as to screen effective signals from the primary selection signal based on the plurality of second coarse screening modules to obtain the coarse screening signal.
3. The method for on-line suppression of low-frequency interference signals according to claim 2, wherein the first coarse screening module is configured to determine a characteristic value corresponding to the original signal based on a time window variable, and determine a noise fluctuation range of the distributed acoustic wave sensing system based on the characteristic value.
4. The method for on-line suppression of low-frequency interference signals according to claim 3, wherein the second coarse screening module is configured to determine that the primary selection signal is a valid signal if an absolute value of a difference between the primary selection signal and a characteristic value is greater than an amplitude variable.
5. The method for on-line suppression of low frequency interference signals according to claim 1, wherein said determining a signal duration and a signal interval time of each segment of the coarse screen signal comprises:
Sequentially acquiring each data point in the coarse screening signal;
determining a failure mark of each section of the coarse screen signal based on the data points, and determining a starting time point and an ending time point of each section of the coarse screen signal based on the failure mark;
And determining the signal duration and the signal interval time of each section of the signals in the coarse screening signal based on the starting time point and the ending time point of each section of the signals in the coarse screening signal.
6. The method for on-line suppression of low frequency interference signals according to claim 1, wherein comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters to rescreen the interference signals to obtain rescreened signals comprises:
And screening the signals corresponding to the reconfigurable parameters with the signal duration longer than or equal to the preset numerical value or with the signal interval time shorter than the preset numerical value in the coarse screening signals to rescreen interference signals again, so as to obtain rescreen signals.
7. The method of on-line suppression of low frequency interference signals according to any one of claims 1-6, wherein subtracting the first data point in the segment from each segment effective signal in the re-screening signal to obtain a true vibration sensing signal comprises:
Inputting the rescreening signal into a first signal extraction module to determine a start time point and an end time point of each section of effective signal in the rescreening signal based on the first signal extraction module;
Inputting the rescreening signal and the starting time point and the ending time point of each section of effective signal to a second signal extraction module so as to subtract the first data point in the section from each section of effective signal in the rescreening signal based on the second signal extraction module by utilizing the starting time point and the ending time point of each section of effective signal to obtain the real vibration sensing signal.
8. An on-line suppression device for low-frequency interference signals, comprising:
the acquisition module is used for acquiring the original signals of each sensing partition demodulated by the distributed acoustic wave sensing system;
the coarse screening module is used for coarse screening the original signals of the sensing subareas based on the same time window variable and the same amplitude variable so as to screen out interference signals and obtain coarse screening signals;
the rescreening module is used for determining the signal duration and the signal interval time of each section of signal in the coarse screening signal, and comparing the signal duration and the signal interval time with preset numerical reconfigurable parameters so as to rescreen interference signals again and obtain rescreening signals;
And the extraction module is used for subtracting the first data point in the section from each section of effective signal in the rescreening signal to obtain a real vibration sensing signal.
9. An electronic device comprising a memory and a processor, wherein,
The memory is used for storing programs;
The processor is coupled to the memory for executing the program stored in the memory to implement the method for on-line suppression of low frequency interference signals according to any one of claims 1 to 7.
10. A non-transitory computer readable storage medium having stored thereon a computer program, wherein the computer program when executed by a processor implements the method of on-line suppression of low frequency interference signals according to any of claims 1 to 7.
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