CN111077229A - Ultrasonic detection method and device for transmitting reference modulation sequence - Google Patents
Ultrasonic detection method and device for transmitting reference modulation sequence Download PDFInfo
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- CN111077229A CN111077229A CN201911292641.8A CN201911292641A CN111077229A CN 111077229 A CN111077229 A CN 111077229A CN 201911292641 A CN201911292641 A CN 201911292641A CN 111077229 A CN111077229 A CN 111077229A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The embodiment of the application relates to an ultrasonic detection method and equipment for transmitting a reference modulation sequence. The ultrasonic detection method for transmitting the reference modulation sequence comprises the following steps: generating a series of baseband sequences and generating a detection baseband signal comprising a first detection sequence and a second detection sequence according to the baseband sequences; modulating the detection baseband signal into ultrasonic waves and outputting the ultrasonic waves; demodulating the reflected or transmitted signal to obtain a baseband demodulation signal; extracting a first signal segment and a second signal segment from the baseband demodulated signal; acquiring the same number N3 or different number N4 of identical baseband code values in each group of the first signal segment and the second signal segment, and judging whether the reflection or transmission signals of the first detection sequence and the second detection sequence arrive according to N3 or N4. The ultrasonic detection method for transmitting the reference modulation sequence can accurately carry out detection and judge the transit time of the reflected or transmitted signal of the ultrasonic wave.
Description
Technical Field
The embodiment of the application relates to the technical field of ultrasonic detection, in particular to an ultrasonic detection method and equipment for transmitting a reference modulation sequence.
Background
The ultrasonic detection technology is widely applied to: the system has important functions in the fields of industry, production and manufacturing, medical health, water area exploration, military, civil construction, intelligent traffic, intelligent cities, artificial intelligence, Internet of things and the like. The ultrasonic detection technology can detect the surface, the internal structure, the contained objects or the defects of a detected object under the condition of no damage, inspect the internal condition of a human body, survey a water area, detect the loss defects of a steel rail, measure the distance between a transmitting source and a detected object, and sense and position the objects.
The existing ultrasonic detection technology generally constructs an ultrasonic detection signal based on a form of a single waveform (pulse, sine wave with a plurality of periods, sine wave with frequency changing along with time, and the like) or a form of a modulation sequence (AM, PM, ASK, FSK, PSK modulation sequence, and the like), and realizes detection of an object to be detected by detecting the comparison between an echo of the ultrasonic detection signal and a local reference signal. Because the ultrasonic signal is influenced by factors such as distance, temperature, noise, interference, Doppler frequency offset and the like in the propagation process, the received signal has large uncontrollable distortion and fluctuation in the aspects of waveform form, amplitude and the like, the similarity with a local reference signal is degraded, even if a complex channel estimation means is adopted, the local reference signal is still obviously different from the received signal, and the local reference signal cannot timely respond to the instantaneous change of a channel, so the echo detection precision of the ultrasonic detection signal is low, and the error is large.
Disclosure of Invention
The embodiment of the application provides an ultrasonic detection method and equipment for transmitting a reference modulation sequence, which can accurately carry out detection and simultaneously accurately judge whether a reflection or transmission signal of ultrasonic waves arrives.
In a first aspect, an embodiment of the present application provides an ultrasonic detection method for transmitting a reference modulation sequence, including the steps of:
generating a series of baseband sequences and generating a detection baseband signal comprising a first detection sequence and a second detection sequence according to the baseband sequences; wherein the duration of the first detection sequence and the duration of the second detection sequence are both T1, and the interval between the first detection sequence and the second detection sequence is T2; a number N1 of identical baseband code values in the first and second detection sequences being greater than a first threshold, or a number N2 of different identical baseband code values in the first and second detection sequences being greater than a first threshold;
modulating the detection baseband signal into a modulation signal of an ultrasonic frequency band, performing electro-acoustic conversion, and outputting the signal to a detected object;
receiving a reflection or transmission signal of the modulation signal, demodulating the reflection or transmission signal after performing sound-electricity conversion to obtain a baseband demodulation signal;
extracting a first signal segment and a second signal segment from the baseband demodulation signal, wherein the first signal segment and the second signal segment extracted each time are a group of signal segments; the first signal segment and the second signal segment have the same duration T3; the interval time between the first signal segment and the second signal segment is T4, and T1+ T2 is T3+ T4; after extraction is finished, translating a baseband code by one bit to continuously extract a first signal segment and a second signal segment until the last baseband code of the baseband demodulation signal is extracted;
acquiring the same number N3 or different number N4 of identical baseband code values in each group of the first signal segment and the second signal segment, and judging whether the reflection or transmission signals of the first detection sequence and the second detection sequence arrive according to the N3 or N4.
Optionally, the T1 is not greater than T3, the T2 is not less than T4, the same number N3 or different number N4 of the baseband code values that are the same in each group of the first signal segment and the second signal segment is obtained, and whether the reflection or transmission signals of the first detection sequence and the second detection sequence arrive is determined according to the N3 or N4, including:
when the N1 is greater than a first threshold, acquiring a first shift amount La of the first signal segment and the second signal segment in the baseband demodulation signal each time when the N3 rises from being lower than the second threshold to being higher than the second threshold, and a second shift amount Lb of the N3 falling from being higher than the second threshold to being lower than the second threshold, wherein each first shift amount La and a first second shift amount Lb which is greater than the first shift amount La form a group of shift amounts;
acquiring a first shift amount La of the first signal segment and the second signal segment in the baseband demodulation signal every time the N4 rises from being lower than a second threshold to being higher than the second threshold, and a second shift amount Lb of the N4 falls from being higher than the second threshold to being lower than the second threshold in each group of signal segments when the number of the N2 is larger than the first threshold;
and calculating the transition time t of each echo arrival of the first detection sequence and the second detection sequence in the baseband demodulation signal according to a formula t (La/2+ Lb/2) × TBE + delta, wherein TBE is a sequence symbol clock period, and delta is a demodulation timing and a compensation value for detecting a fixed offset.
Optionally, extracting the first signal segment and the second signal segment from the baseband demodulation signal includes:
extracting the baseband demodulation signal through a first time window and a second time window from the starting time of the baseband demodulation signal, wherein the duration of the first time window and the duration of the second time window are T3, the interval time between the first time window and the second time window is T4, the signal extracted by the first time window is a first signal segment, and the signal extracted by the second time window is a second signal segment;
and after extraction is finished, translating the first time window and the second time window by taking a clock period as a step length, and extracting signals in the current first time window and the current second time window until the end time of the baseband demodulation signal is extracted.
Optionally, extracting the first signal segment and the second signal segment from the baseband demodulation signal includes:
shifting and registering the baseband demodulation signal;
two sections of signals with register addresses of d- [ (d + DT3) -1] and [ (d + DT3) + DT4] - { [ (d + DT3) + DT4] + DT3-1 ] are selected for extraction, wherein d is the register address selected at the first position, the time length corresponding to DT3 is T3, the time length corresponding to DT4 is T4, and the two sections of extracted signals are the first signal segment and the second signal segment respectively;
and after extraction is finished, carrying out shift register operation, and extracting the signal in the current register address again after each translation step until the translation amount reaches the upper limit.
Optionally, in the first detection sequence and the second detection sequence, each baseband code value is the same;
or, each bit baseband code value in the first detection sequence and the second detection sequence is different.
In a second aspect, an embodiment of the present application provides a transmitted reference modulation sequence ultrasonic detection apparatus, including a transmitting device and a receiving device: the transmitting device comprises a baseband sequence generator, a detection signal generator, a modulator and a first transducer, and the receiving device comprises a second transducer, a demodulator and a controller;
the base band sequence generator generates a series of base band sequences and generates a detection base band signal comprising a first detection sequence and a second detection sequence according to the base band sequences; wherein the duration of the first detection sequence and the duration of the second detection sequence are both T1, and the interval between the first detection sequence and the second detection sequence is T2; a number N1 of identical baseband code values in the first and second detection sequences being greater than a first threshold, or a number N2 of different identical baseband code values in the first and second detection sequences being greater than a first threshold;
the modulator modulates the detection baseband signal into a modulation signal of an ultrasonic frequency band, and then outputs the modulation signal to a measured object through the first transducer;
the second transducer receives a reflection or transmission signal of the modulation signal and outputs the reflection or transmission signal to the demodulator, and the demodulator performs sound-electricity conversion on the reflection or transmission signal and demodulates the reflection or transmission signal to obtain a baseband demodulation signal;
the controller extracts a first signal segment and a second signal segment from the baseband demodulation signal, wherein the first signal segment and the second signal segment extracted each time are a group of signal segments; the first signal segment and the second signal segment have the same duration T3; the interval time between the first signal segment and the second signal segment is T4, and T1+ T2 is T3+ T4; after extraction is finished, translating a baseband code by one bit to continuously extract a first signal segment and a second signal segment until the last baseband code of the baseband demodulation signal is extracted;
the controller acquires the same number N3 or different number N4 of baseband code values with the same bits in each group of the first signal segment and the second signal segment, and judges whether the reflection or transmission signals of the first detection sequence and the second detection sequence arrive according to the N3 or N4.
Optionally, the T1 is not less than T3, the T2 is not less than T4,
when the N1 is greater than the first threshold, the controller acquires a first shift amount La in the baseband demodulation signal of the first signal segment and the second signal segment each time the N3 rises from below the second threshold to above the second threshold, and a second shift amount Lb each time the N3 falls from above the second threshold to below the second threshold, wherein each first shift amount La and the first second shift amount Lb which is greater than the first shift amount La form a group of shift amounts;
when the number of N2 is larger than a first threshold, the controller acquires a first shift amount La in the baseband demodulation signal of the first signal segment and the second signal segment every time the N4 rises from below the second threshold to above the second threshold, and a second shift amount Lb every time the N4 falls from above the second threshold to below the second threshold in each group of signal segments;
and the controller calculates the transit time t of each arrival of the echoes of the first detection sequence and the second detection sequence in the baseband demodulation signal according to a formula t (La/2+ Lb/2) × TBE + delta, wherein TBE is a sequence code element clock period, and delta is a demodulation timing sequence and a compensation value for detecting a fixed offset.
Optionally, the extracting, by the controller, the first signal segment and the second signal segment from the baseband demodulation signal includes:
the controller extracts the baseband demodulation signal through a first time window and a second time window from the starting time of the baseband demodulation signal, wherein the duration of the first time window and the duration of the second time window are T3, the interval time between the first time window and the second time window is T4, the signal extracted by the first time window is a first signal segment, and the signal extracted by the second time window is a second signal segment;
after extraction is finished, the controller translates the first time window and the second time window by taking a clock period as a step length, and extracts signals in the current first time window and the current second time window until the end time of the baseband demodulation signal is extracted.
Optionally, the controller includes a shift register, and the controller extracts the first signal segment and the second signal segment from the baseband demodulation signal, including:
the shift register shifts and registers the baseband demodulation signal;
the controller selects two sections of signals with register addresses of d- [ (d + DT3) -1] and [ (d + DT3) + DT4] - { [ (d + DT3) + DT4] + DT3-1} for extraction, wherein d is the register address selected at the first position, the time length corresponding to DT3 is T3, the time length corresponding to DT4 is T4, and the two sections of extracted signals are the first signal segment and the second signal segment respectively;
after extraction is finished, the shift register carries out shift register operation, and the signals in the current register address are extracted again after each translation step until the translation amount reaches the upper limit.
Optionally, in the first detection sequence and the second detection sequence, each baseband code value is the same;
or, each bit baseband code value in the first detection sequence and the second detection sequence is different.
In the embodiment of the application, by transmitting the first detection sequence and the second detection sequence signals respectively used as the detection sequence and the reference sequence to the object to be detected, since the same or different numbers of baseband code values of the same bits of the first detection sequence are greater than the first threshold, and the first detection sequence and the second detection sequence are converted into the ultrasonic signals, and the changes of the signals tend to be the same after being influenced by the same distance, temperature, noise, interference, doppler frequency offset and other factors, it is possible to overcome the influence of the distance, temperature, noise, interference, doppler frequency offset and other factors on the ultrasonic waves by simultaneously extracting multiple sets of the first signal segment and the second signal segment in the echo and judging whether the reflected or transmitted signals of the first detection sequence and the second detection sequence arrive according to the same or different numbers of baseband code values of the same bits of the first signal segment and the second signal segment, the reflected or transmitted signal of the ultrasonic signal is detected more accurately.
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Drawings
FIG. 1 is a flow chart of an ultrasonic detection method of transmitting a reference modulation sequence according to an embodiment of the present application shown in an exemplary embodiment;
fig. 2 is a schematic diagram of a baseband signal BU and a modulated signal U shown in an exemplary embodiment;
FIG. 3 is a schematic illustration of an echo reflected or transmitted signal E and a baseband demodulated signal BE shown in an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating the extraction of a first signal segment and a second signal segment in one exemplary embodiment;
FIG. 5 is a flow chart illustrating the determination of reflected or transmitted signals of the first detection sequence and the second detection sequence in one exemplary embodiment;
FIG. 6 is a graph of the same number N3 of baseband code values that are the same in the first signal segment and the second signal segment shown in an exemplary embodiment;
fig. 7 is a flow diagram illustrating the extraction of a first signal segment and a second signal segment from the baseband demodulated signal in an exemplary embodiment;
fig. 8 is a flow diagram illustrating the extraction of a first signal segment and a second signal segment from the baseband demodulated signal in an exemplary embodiment;
FIG. 9 is a schematic diagram of an ultrasonic testing apparatus configured to transmit a reference modulation sequence according to an embodiment of the present application, shown in an exemplary embodiment;
fig. 10 is a schematic structural diagram of an ultrasonic detection apparatus that transmits a reference modulation sequence according to an embodiment of the present application, which is shown in an exemplary embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
It should be understood that the embodiments described are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims. In the description of the present application, it is to be understood that the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not necessarily used to describe a particular order or sequence, nor are they to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The present application proposes a method of ultrasonic detection of a transmitted reference modulation sequence, as shown in fig. 1, which in an exemplary embodiment comprises the steps of:
step S101: generating a series of baseband sequences and generating a detection baseband signal comprising a first detection sequence and a second detection sequence according to the baseband sequences;
wherein the duration of the first detection sequence and the duration of the second detection sequence are both T1, and the interval between the first detection sequence and the second detection sequence is T2; the number N1 of identical baseband code values in the first and second detection sequences is greater than a first threshold, or the number N2 of different identical baseband code values in the first and second detection sequences is greater than a first threshold.
As shown in fig. 2, fig. 2 is a schematic diagram of a baseband signal BU, where the baseband signal BU includes a first detection sequence UT and a second detection sequence UR, and the duration of the first detection sequence UT and the duration of the second detection sequence UR are both T1, and the interval between the first detection sequence UT and the second detection sequence UR is T2. In this embodiment, the first detection sequence UT is a detection sequence, and the second detection sequence UR is a reference sequence, in other examples, the first detection sequence UT may be a reference sequence, and the second detection sequence UR may be a detection sequence.
In fig. 2, the first detection sequence UT and the second detection sequence UR may be generated in any manner based on a baseband sequence BC, and baseband code values of the same bits in the first detection sequence UT and the second detection sequence UR are the same, in other examples, the baseband code values of the same bits in the first detection sequence UT and the second detection sequence UR may be different, or the baseband code values of the same bits may be the same number N1 or the different number N2 is greater than a first threshold.
Step S102: modulating the detection baseband signal into a modulation signal of an ultrasonic frequency band, performing electro-acoustic conversion, and outputting the signal to a detected object;
as shown in fig. 2, the baseband signal BU is modulated to obtain a modulated signal U satisfying the ultrasonic frequency band. And (3) forming a transmitting wave after the detection signal U is subjected to electro-acoustic conversion, transmitting the transmitting wave to the object to be detected, and starting receiving detection at the same time of transmission. The modulation on the baseband signal BU may be any form of modulation, such as OOK, ASK, FSK, PSK, or the like. For convenience of illustration, the embodiment of the present application employs OOK modulation.
Step S103: receiving a reflection or transmission signal of the modulation signal, demodulating the reflection or transmission signal after performing sound-electricity conversion to obtain a baseband demodulation signal;
the transmission reference modulation sequence ultrasonic detection method of the embodiment of the application can be applied to a reflection method and a transmission method, so that the reflection or transmission signal is a reflection signal when the transmitted ultrasonic modulation signal meets the object to be detected or a transmission signal passing through the object to be detected. As shown in fig. 3, after receiving the echo reflected or transmitted signal E, demodulating the echo reflected or transmitted signal E to obtain a baseband demodulated signal BE, where the baseband demodulated signal BE includes an echo ET of the first detection sequence UT and an echo ER of the second detection sequence UR, and the echo ET and ER in the baseband demodulated signal BE may change with the baseband codes of the detection sequences UT and UR due to the fact that the ultrasonic signal is affected by factors such as distance, temperature, noise, interference, doppler frequency offset, and the like during the propagation process, but the detection sequences UT and UR are synchronous changes to generate the echoes ET and ER, so the corresponding relationship between the baseband codes in the echo ET and the echo ET is the same as that of UT and UR.
Step S104: extracting a first signal segment and a second signal segment from the baseband demodulated signal;
wherein the first signal segment and the second signal segment have the same duration T3; the interval time between the first signal segment and the second signal segment is T4, and T1+ T2 is T3+ T4; and after extraction is finished, shifting the baseband code by one bit to continuously extract the first signal segment and the second signal segment until the last baseband code of the baseband demodulation signal is extracted, wherein the first signal segment and the second signal segment extracted each time are a group of signal segments.
Step S105: acquiring the same number N3 or different number N4 of identical baseband code values in each group of the first signal segment and the second signal segment, and judging whether the reflection or transmission signals of the first detection sequence and the second detection sequence arrive according to the N3 or N4.
In a preferred example, when T1 is T3 and T2 is T4, the signal widths of the first and second signal segments are the same as those of the first and second detection sequences UT and UR, and the interval width between the first and second detection sequences UR is also the same, so that the echo ET of the first detection sequence UT and the echo ER of the second detection sequence UR can be extracted exactly in the extraction process of the first and second signal segments.
As shown in fig. 4, at the time of the nth extraction, the first signal segment extracts the echo ER, the second signal segment extracts the echo ET, then, by determining whether the number N3 of the same bit baseband codes in the first signal segment and the second signal segment is identical to N1, it can be determined whether the echo ET and the echo ER are extracted from the first signal segment and the second signal segment, in some examples, although the detection sequences UT and UR are varying synchronously to produce echoes ET and ER, however, deviations may occur, in which case the same number N3 of identical baseband codes in the echo ET and ER does not coincide with the same number N1 of identical baseband codes in the first and second detection sequences UT and UR, in this case, whether or not the echo ET and the echo ER are detected can be determined by determining the maximum value of N3 in which the same number of baseband codes of the same bit is present in the first signal segment and the second signal segment.
In some examples, the same or different numbers of identical baseband codes in the two end sequences may be calculated by calculating the same or different degrees of identical baseband codes in the two end sequences through a correlation calculation method instead of directly calculating the specific numbers thereof.
In other examples, the T3 may be greater than T1 or less than T1, if T1+ T2 is satisfied, that is, T3+ T4, it may be determined whether the echo ET and the echo ER are extracted according to the same or different numbers of same-bit baseband codes in the first signal segment and the second signal segment, and the accurate arrival time of the echo ET and the echo ER may be determined according to the maximum value of the same or different numbers M of the same-bit baseband codes, for example, if T3 is less than T1, the first maximum point at which M continuously reaches the maximum value is the starting point at which the second echo arrives, and if T3 is greater than T1, the last maximum point at which M continuously reaches the maximum value is the starting point at which the second echo arrives.
In the embodiment of the application, by transmitting the first detection sequence and the second detection sequence signals respectively used as the detection sequence and the reference sequence to the object to be detected, since the same or different numbers of baseband code values of the same bits of the first detection sequence are greater than the first threshold, and the first detection sequence and the second detection sequence are converted into the ultrasonic signals, and the changes of the signals tend to be the same after being influenced by the same distance, temperature, noise, interference, doppler frequency offset and other factors, it is possible to overcome the influence of the distance, temperature, noise, interference, doppler frequency offset and other factors on the ultrasonic waves by simultaneously extracting multiple sets of the first signal segment and the second signal segment in the echo and judging whether the reflected or transmitted signals of the first detection sequence and the second detection sequence arrive according to the same or different numbers of baseband code values of the same bits of the first signal segment and the second signal segment, the reflected or transmitted signal of the ultrasonic signal is detected more accurately.
In an exemplary embodiment, when T1 ≦ T3 and T2 ≧ T4, as shown in fig. 5, the same number N3 or different number N4 of baseband code values that are the same in each set of the first signal segment and the second signal segment is obtained, and whether the reflected or transmitted signal of the first detection sequence and the second detection sequence arrives according to N3 or N4 is determined, including the following steps:
step S501: acquiring a first translation amount La and a second translation amount Lb;
specifically, when N1 is greater than a first threshold, obtaining a first shift amount La of the first signal segment and the second signal segment in the baseband demodulated signal each time N3 rises from below the second threshold to above the second threshold, and a second shift amount Lb of N3 falls from above the second threshold to below the second threshold, where each first shift amount La and the first second shift amount Lb that is greater than the first shift amount La form a group of shift amounts;
acquiring a first shift amount La in the baseband demodulation signal of the first signal segment and the second signal segment every time the N4 rises from being lower than a second threshold to being higher than the second threshold, and a second shift amount Lb in the baseband demodulation signal of the N4 falls from being higher than the second threshold to being lower than the second threshold in each group of signal segments when the number of the N2 is larger than the first threshold;
step S502: and calculating the transition time t of each echo arrival of the first detection sequence and the second detection sequence in the baseband demodulation signal according to a formula t (La/2+ Lb/2) × TBE + delta, wherein TBE is a sequence symbol clock period, and delta is a demodulation timing and a compensation value for detecting a fixed offset.
As shown in fig. 6, the bottom graph in fig. 6 is a graph of the number N3 of identical baseband code values in the first signal segment and the second signal segment, and it can be seen from the graph that N3 reaches peaks at two moments, and since the intensity value of each peak may not be consistent, the present application captures each peak by determining two adjacent points reaching the second threshold and according to the average value of the abscissa values of the two points.
The arrival time of the echo calculated by the above formula T is the arrival time of the echo ER, and the arrival time of the echo ET is equal to T + T1+ T3.
As shown in fig. 7, in an exemplary embodiment, extracting a first signal segment and a second signal segment from the baseband demodulated signal includes:
step S701: extracting the baseband demodulation signal through a first time window and a second time window from the starting time of the baseband demodulation signal, wherein the duration of the first time window and the duration of the second time window are T3, the interval time between the first time window and the second time window is T4, the signal extracted by the first time window is a first signal segment, and the signal extracted by the second time window is a second signal segment;
step S702: and after extraction is finished, translating the first time window and the second time window by taking a clock period as a step length, and extracting signals in the current first time window and the current second time window until the end time of the baseband demodulation signal is extracted.
In another exemplary embodiment, as shown in fig. 8, extracting the first signal segment and the second signal segment from the baseband demodulated signal comprises:
step S801: shifting and registering the baseband demodulation signal;
step S802: two sections of signals with register addresses of d- [ (d + DT3) -1] and [ (d + DT3) + DT4] - { [ (d + DT3) + DT4] + DT3-1 ] are selected for extraction, wherein d is the register address selected at the first position, the time length corresponding to DT3 is T3, the time length corresponding to DT4 is T4, and the two sections of extracted signals are the first signal segment and the second signal segment respectively; in this embodiment, d may be 1, and since the echoes of the first detection sequence and the second detection sequence are not received immediately in the reflected or transmitted signal, d may also be another set value, that is, the first bit of the selected register address may not be the first baseband code in the received reflected or transmitted signal.
Step S803: and after extraction is finished, carrying out shift register operation, and extracting the signal in the current register address again after each translation step until the translation amount reaches the upper limit.
In the embodiment of the present application, the set threshold may be a fixed value or a value controlled externally. The sequences may be formed in any manner. The modulation can be any form of modulation mode, such as OOK, ASK, FSK, PSK, and the like. The method is not limited to the number of the specifically realized channels, and can be applied to any channel, such as the construction of array detection systems of multi-channel transmission, multi-channel reception and the like, phased array ultrasonic detection systems and the like. The method can be applied to various detection modes, such as detection in various modes of reflection, penetration, liquid immersion, diffraction, focusing, array detection, phased array detection and the like.
In correspondence with the foregoing ultrasonic detection method for transmitting a reference modulation sequence, the embodiment of the present application further provides an ultrasonic detection apparatus for transmitting a reference modulation sequence, and in an exemplary embodiment, as shown in fig. 9, the ultrasonic detection apparatus for transmitting a reference modulation sequence includes a transmitting device 100, a receiving device 200, and a transmission and reception synchronization control device 300: the transmitting device 100 includes a timer 110, a baseband sequence generator 120, a detection signal generator 130, a modulator 140, a power driver 150, and a first transducer 160, and the receiving device 200 includes a second transducer 210, a receiving front end 220, a demodulator 230, and a controller 240.
The baseband sequence generator 120 generates a series of baseband sequences, and the timer 110 controls the detection sequence generator 130 to generate a detection baseband signal including a first detection sequence and a second detection sequence according to the baseband sequences; wherein the duration of the first detection sequence and the duration of the second detection sequence are both T1, and the interval between the first detection sequence and the second detection sequence is T2; the number N1 of identical baseband code values in the first and second detection sequences is greater than a first threshold, or the number N2 of different identical baseband code values in the first and second detection sequences is greater than a first threshold.
The modulator 140 modulates the detected baseband signal into a modulated signal of an ultrasonic frequency band, and outputs the modulated signal to a measured object through the first transducer 160 after being driven and amplified by the power driver 150;
when the transmitting device 100 outputs an ultrasonic signal, the transceiving synchronization device 300 controls the receiving device 200 to start the receiving and detecting operations of the ultrasonic wave.
The second transducer 210 receives a reflection or transmission signal of the modulation signal and outputs the reflection or transmission signal to the demodulator 230 through the receiving front end 220, and the demodulator 230 performs an acousto-electric conversion on the reflection or transmission signal and demodulates the reflection or transmission signal to obtain a baseband demodulation signal, and outputs the baseband demodulation signal to the controller 240.
The controller 240 extracts a first signal segment and a second signal segment from the baseband demodulation signal, wherein the first signal segment and the second signal segment extracted each time are a group of signal segments; the first signal segment and the second signal segment have the same duration T3; the interval time between the first signal segment and the second signal segment is T4, and T1+ T2 is T3+ T4; after extraction is finished, translating a baseband code by one bit to continuously extract a first signal segment and a second signal segment until the last baseband code of the baseband demodulation signal is extracted;
the controller 240 obtains the same number N3 or different number N4 of baseband code values with the same bits in each set of the first signal segment and the second signal segment, and determines whether the reflected or transmitted signals of the first detection sequence and the second detection sequence arrive according to the N3 or N4.
In an exemplary embodiment, T1 ≦ T3, T2 ≧ T4.
When the N1 is greater than the first threshold, the controller 240 obtains, for each group of signal segments, a first amount of translation La in the baseband demodulated signal for the first signal segment and the second signal segment each time the N3 rises from below the second threshold to above the second threshold, and a second amount of translation Lb for the N3 each time the N3 falls from above the second threshold to below the second threshold, wherein each first amount of translation La and the first second amount of translation Lb that is greater than the first amount of translation La form a group of amounts of translation;
when the number of N2 is greater than the first threshold, the controller 240 obtains a first amount of shift La in the baseband demodulated signal for the first signal segment and the second signal segment each time the N4 rises above the second threshold from below the second threshold to above the second threshold, and a second amount of shift Lb each time the N4 falls below the second threshold from above the second threshold;
the controller 240 calculates the transit time t of each echo arrival of the first detection sequence and the second detection sequence in the baseband demodulation signal according to a formula t ═ La/2+ Lb/2 ═ TBE + Δ, where TBE is a sequence symbol clock period, and Δ is a compensation value of a demodulation timing and a detection fixed offset.
In an exemplary embodiment, the controller 240 extracts the first signal segment and the second signal segment from the baseband demodulated signal, including:
the controller 240 extracts the baseband demodulation signal through a first time window and a second time window from a start time of the baseband demodulation signal, wherein a duration of the first time window and the second time window is T3, an interval time between the first time window and the second time window is T4, the signal extracted by the first time window is a first signal segment, and the signal extracted by the second time window is a second signal segment;
after the extraction is completed, the controller 240 translates the first time window and the second time window by taking a clock period as a step length, and extracts signals in the current first time window and the current second time window until the end time of the baseband demodulation signal is extracted.
In an exemplary embodiment, as shown in fig. 10, the controller 240 includes a shift register 241, and the controller 240 extracts a first signal segment and a second signal segment from the baseband demodulated signal, including:
the shift register 241 performs shift register on the baseband demodulation signal;
the controller 240 selects two segments of signals with register addresses of d- [ (d + DT3) -1], and addresses of [ (d + DT3) + DT4] - { [ (d + DT3) + DT4] + DT3-1} for extraction, wherein d is the register address selected at the first position, the time length corresponding to DT3 is T3, the time length corresponding to DT4 is T4, and the two segments of signals to be extracted are the first signal segment and the second signal segment respectively;
after the extraction is completed, the shift register 241 performs shift register operation, and the controller 240 extracts the signal in the current register address again after every translation step until the translation amount reaches the upper limit.
For the apparatus embodiment, since it basically corresponds to the method embodiment, reference may be made to the partial description of the method embodiment for relevant points. The above-described device embodiments are merely illustrative, wherein the components described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the disclosed solution. One of ordinary skill in the art can understand and implement it without inventive effort. The electronic device provided by the above can be used to execute the resource calling method provided by any of the above embodiments, and has corresponding functions and beneficial effects. The implementation process of the function and the action of each component in the device is specifically described in the implementation process of the corresponding step in the resource calling method, and is not described herein again.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the embodiments of the application following, in general, the principles of the embodiments of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the embodiments of the application pertain. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the embodiments of the application being indicated by the following claims.
It is to be understood that the embodiments of the present application are not limited to the precise arrangements described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the embodiments of the present application is limited only by the following claims.
The above-mentioned embodiments only express a few embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, variations and modifications can be made without departing from the concept of the embodiments of the present application, and these embodiments are within the scope of the present application.
Claims (10)
1. An ultrasonic detection method for transmitting a reference modulation sequence, comprising:
generating a series of baseband sequences and generating a detection baseband signal comprising a first detection sequence and a second detection sequence according to the baseband sequences; wherein the duration of the first detection sequence and the duration of the second detection sequence are both T1, and the interval between the first detection sequence and the second detection sequence is T2; a number N1 of identical baseband code values in the first and second detection sequences being greater than a first threshold, or a number N2 of different identical baseband code values in the first and second detection sequences being greater than a first threshold;
modulating the detection baseband signal into a modulation signal of an ultrasonic frequency band, performing electro-acoustic conversion, and outputting the modulation signal to a detected object;
receiving a reflection or transmission signal of the modulation signal, demodulating the reflection or transmission signal after performing sound-electricity conversion to obtain a baseband demodulation signal;
extracting a first signal segment and a second signal segment from the baseband demodulation signal, wherein the first signal segment and the second signal segment extracted each time are a group of signal segments; the first signal segment and the second signal segment have the same duration T3; the interval time between the first signal segment and the second signal segment is T4, and T1+ T2 is T3+ T4; after extraction is finished, translating a baseband code by one bit to continuously extract a first signal segment and a second signal segment until the last baseband code of the baseband demodulation signal is extracted;
acquiring the same number N3 or different number N4 of identical baseband code values in each group of the first signal segment and the second signal segment, and judging whether the reflection or transmission signals of the first detection sequence and the second detection sequence arrive according to the N3 or N4.
2. The method of claim 1, wherein T1 ≤ T3 and T2 ≥ T4, obtaining the same number N3 or different number N4 of the baseband code values in the same group of the first signal segment and the second signal segment, and determining whether the reflected or transmitted signals of the first detection sequence and the second detection sequence arrive according to the N3 or N4, comprises:
when the N1 is greater than a first threshold, acquiring a first shift amount La in the baseband demodulation signal of the first signal segment and the second signal segment when the N3 rises from below the second threshold to above the second threshold each time, and a second shift amount Lb when the N3 falls from above the second threshold to below the second threshold each time, wherein each first shift amount La and the first second shift amount Lb which is greater than the first shift amount La form a group of shift amounts;
acquiring a first shift amount La in the baseband demodulation signal of the first signal segment and the second signal segment every time the N4 rises from being lower than a second threshold to being higher than the second threshold, and a second shift amount Lb in the baseband demodulation signal of the N4 falls from being higher than the second threshold to being lower than the second threshold in each group of signal segments when the number of the N2 is larger than the first threshold;
and calculating the transition time t of each echo arrival of the first detection sequence and the second detection sequence in the baseband demodulation signal according to a formula t (La/2+ Lb/2) × TBE + delta, wherein TBE is a sequence symbol clock period, and delta is a demodulation timing and a compensation value for detecting a fixed offset.
3. The method of claim 1, wherein extracting the first signal segment and the second signal segment from the baseband demodulated signal comprises:
extracting the baseband demodulation signal through a first time window and a second time window from the starting time of the baseband demodulation signal, wherein the duration of the first time window and the duration of the second time window are T3, the interval time between the first time window and the second time window is T4, the signal extracted by the first time window is a first signal segment, and the signal extracted by the second time window is a second signal segment;
and after extraction is finished, translating the first time window and the second time window by taking a clock period as a step length, and extracting signals in the current first time window and the current second time window until the end time of the baseband demodulation signal is extracted.
4. The method of claim 1, wherein extracting the first signal segment and the second signal segment from the baseband demodulated signal comprises:
shifting and registering the baseband demodulation signal;
two sections of signals with register addresses of d- [ (d + DT3) -1] and [ (d + DT3) + DT4] - { [ (d + DT3) + DT4] + DT3-1 ] are selected for extraction, wherein d is the register address selected at the first position, the time length corresponding to DT3 is T3, the time length corresponding to DT4 is T4, and the two sections of extracted signals are the first signal segment and the second signal segment respectively;
and after extraction is finished, carrying out shift register operation, and extracting the signal in the current register address again after each translation step until the translation amount reaches the upper limit.
5. The ultrasonic detection method of transmitting a reference modulation sequence according to any one of claims 1 to 4, characterized in that:
in the first detection sequence and the second detection sequence, each bit baseband code value is the same;
or, each bit baseband code value in the first detection sequence and the second detection sequence is different.
6. An ultrasonic detection device for transmitting a reference modulation sequence, characterized in that:
the device comprises a transmitting device and a receiving device: the transmitting device comprises a baseband sequence generator, a detection signal generator, a modulator and a first transducer, and the receiving device comprises a second transducer, a demodulator and a controller;
the base band sequence generator generates a series of base band sequences, and the detection signal generator generates a detection base band signal comprising a first detection sequence and a second detection sequence according to the base band sequences; wherein the duration of the first detection sequence and the duration of the second detection sequence are both T1, and the interval between the first detection sequence and the second detection sequence is T2; a number N1 of identical baseband code values in the first and second detection sequences being greater than a first threshold, or a number N2 of different identical baseband code values in the first and second detection sequences being greater than a first threshold;
the modulator modulates the detection baseband signal into a modulation signal of an ultrasonic frequency band, and then outputs the modulation signal to a measured object through the first transducer;
the second transducer receives a reflection or transmission signal of the modulation signal and outputs the reflection or transmission signal to the demodulator, and the demodulator performs sound-electricity conversion on the reflection or transmission signal and demodulates the reflection or transmission signal to obtain a baseband demodulation signal;
the controller extracts a first signal segment and a second signal segment from the baseband demodulation signal, wherein the first signal segment and the second signal segment extracted each time are a group of signal segments; the first signal segment and the second signal segment have the same duration T3; the interval time between the first signal segment and the second signal segment is T4, and T1+ T2 is T3+ T4; after extraction is finished, translating a baseband code by one bit to continuously extract a first signal segment and a second signal segment until the last baseband code of the baseband demodulation signal is extracted;
the controller obtains the same number N3 or different number N4 of identical baseband code values in each group of the first signal segment and the second signal segment, judges whether the reflection or transmission signals of the first detection sequence and the second detection sequence arrive according to the N3 or the N4, and calculates the transit time.
7. The transmitted reference modulation sequence ultrasonic detection device of claim 6, wherein:
the T1 is not less than T3, and the T2 is not less than T4;
when the N1 is greater than the first threshold, the controller obtains a first shift amount La of the first signal segment and the second signal segment in the baseband demodulation signal every time the N3 rises from being lower than the second threshold to being higher than the second threshold, and obtains a second shift amount Lb of the N3 falling from being higher than the second threshold to being lower than the second threshold, wherein each first shift amount La and the first second shift amount Lb which is greater than the first shift amount La form a group of shift amounts;
when the number of N2 is larger than a first threshold, the controller acquires a first shift amount La in the baseband demodulation signal of the first signal segment and the second signal segment every time the N4 rises from below the second threshold to above the second threshold, and a second shift amount Lb every time the N4 falls from above the second threshold to below the second threshold in each group of signal segments;
and the controller calculates the transit time t of each arrival of the echoes of the first detection sequence and the second detection sequence in the baseband demodulation signal according to a formula t (La/2+ Lb/2) × TBE + delta, wherein TBE is a sequence code element clock period, and delta is a demodulation timing sequence and a compensation value for detecting a fixed offset.
8. The transmitted reference modulation sequence ultrasonic detection device of claim 6, wherein the controller extracts a first signal segment and a second signal segment from the baseband demodulated signal, comprising:
the controller extracts the baseband demodulation signal through a first time window and a second time window from the starting time of the baseband demodulation signal, wherein the duration of the first time window and the duration of the second time window are T3, the interval time between the first time window and the second time window is T4, the signal extracted by the first time window is a first signal segment, and the signal extracted by the second time window is a second signal segment;
after extraction is finished, the controller translates the first time window and the second time window by taking a clock period as a step length, and extracts signals in the current first time window and the current second time window until the end time of the baseband demodulation signal is extracted.
9. The ultrasonic detection device of claim 6, wherein the controller comprises a shift register, wherein the controller extracts a first signal segment and a second signal segment from the baseband demodulated signal, and wherein the controller comprises:
the shift register shifts and registers the baseband demodulation signal;
the controller selects two sections of signals with register addresses of d- [ (d + DT3) -1] and [ (d + DT3) + DT4] - { [ (d + DT3) + DT4] + DT3-1} for extraction, wherein d is the register address selected at the first position, the time length corresponding to DT3 is T3, the time length corresponding to DT4 is T4, and the two sections of extracted signals are the first signal segment and the second signal segment respectively;
after extraction is finished, the shift register carries out shift register operation, and the signals in the current register address are extracted again after each translation step until the translation amount reaches the upper limit.
10. The transmitted reference modulation sequence ultrasonic detection apparatus according to any one of claims 6 to 9, characterized in that:
in the first detection sequence and the second detection sequence, each bit baseband code value is the same;
or, each bit baseband code value in the first detection sequence and the second detection sequence is different.
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