CN117572437A - Multi-line Cheng Kuandai signal monomer identification method, system and equipment - Google Patents
Multi-line Cheng Kuandai signal monomer identification method, system and equipment Download PDFInfo
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- 238000007906 compression Methods 0.000 claims abstract description 47
- 238000004904 shortening Methods 0.000 claims abstract description 7
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- 238000004364 calculation method Methods 0.000 claims description 6
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- 230000005540 biological transmission Effects 0.000 description 9
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/88—Sonar systems specially adapted for specific applications
- G01S15/96—Sonar systems specially adapted for specific applications for locating fish
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/52—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00
- G01S7/539—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S15/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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Abstract
The invention provides a method, a system and equipment for identifying a multi-line Cheng Kuandai signal monomer, which relate to the field of broadband signal monomer target identification, and comprise the following steps: based on the bandwidth and the pulse width of an impulse response signal of the receiver, carrying out full-bandwidth pulse compression on an echo signal of a target to be detected and carrying out wrapping to obtain an envelope signal; judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected or not based on an amplitude criterion, if so, determining the peak value of the envelope signal which accords with the amplitude range of the target to be detected as the peak value after the amplitude criterion; and judging whether the peak value interval between the adjacent peak values passing through the amplitude criterion is larger than the pulse width of the impulse response signal, if so, determining that the target to be detected corresponding to the peak value passing through the amplitude criterion is a single fish, and if not, shortening the bandwidth and the pulse width of the impulse response signal, and continuing target identification until all the targets to be detected are identified. The invention reduces the emission frequency and improves the monomer recognition efficiency.
Description
Technical Field
The invention relates to the field of broadband signal monomer target identification, in particular to a method, a system and equipment for identifying a multi-line Cheng Kuandai signal monomer.
Background
The monomer recognition technology is to calculate a monomer echo signal by utilizing an acoustic signal, so as to realize the process of detecting, recognizing and tracking a target to be detected. Single echo signal calculation is widely applied in different fields, and mainly comprises the steps of calculating the position, the speed, the size and the like of a target by analyzing the acoustic characteristics of echo signals in radar technology; detecting a defect crack or the like in a material by using ultrasonic waves in nondestructive detection; used in geological exploration for understanding the condition of subsurface geology; the detection, positioning, tracking and the like of the underwater target are mainly realized in the sonar technology.
In marine fishery, the calculation of the single echo signals is mainly used for detecting and positioning fish shoal, and different types of fishes are identified through the intensity, time delay and the like of the echo signals, so that the distribution and the quantity of the fishes are evaluated, the size and the density of the fish shoal can be deduced, and the method plays a vital role in fishery management and sustainable fishery implementation.
The split beam technology is often used for establishing various fish acoustic measurement models due to the advantages of high target positioning accuracy, high anti-interference performance, high spatial resolution and the like. The broadband signal has the characteristics of larger frequency band, high transmission rate, difficult interference such as multipath fading, capability of transmitting a plurality of narrowband signals at the same time, and the like, and is widely applied to the identification of single signals. The phase standard deviation of the monomer target identification of the traditional narrowband signal is an important index of monomer identification and detection, but the calculation of the phase standard deviation is not effective any more due to the influence of the broadband phase difference time variation.
The existing amplitude criterion for judging the monomer signals is mainly applied to narrow bands, the criterion is not perfect for judging the broadband signals after pulse pressure, only targets with different distances can be detected by continuously changing pulse width of the transmitting signals, pulse compression is carried out, and if no fish shoals exist in a detection area or the transmitting pulse width is longer but the monomer and the fish shoals are at the position close to the transducer, when effective monomer signals cannot be screened out after pulse pressure, the pulse width of the transmitting signals needs to be changed to repeatedly detect, so that the time is consumed. When the transmission interval is long, the fish shoal may move to a position when the next sound signal arrives, which still cannot detect the target, and the transmission pulse width still needs to be adjusted to re-detect.
Disclosure of Invention
The invention aims to provide a method, a system and equipment for identifying monomers of a multi-line Cheng Kuandai signal, which are used for solving the problems of high transmitting frequency and low monomer identification efficiency caused by repeatedly adjusting the bandwidth of a transmitting signal to detect an unknown sea area.
In order to achieve the above object, the present invention provides the following solutions:
a method for identifying a multi-line Cheng Kuandai signal monomer, comprising:
based on the bandwidth and the pulse width of an impulse response signal of the receiver, carrying out full-bandwidth pulse compression on an echo signal of a target to be detected and carrying out wrapping to obtain an envelope signal; the echo signal is a signal returned after the receiver receives the primary linear frequency modulation signal transmitted by the transducer to the target to be detected; the bandwidth of the impulse response signal is equal to the emission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the emission pulse width of the transducer;
judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected or not based on an amplitude criterion to obtain a first judgment result;
if the first judgment result shows that the first judgment result is yes, determining the peak value of the envelope signal which accords with the amplitude range of the target to be detected as the peak value after the amplitude criterion;
judging whether the peak value interval between the adjacent peak values after the amplitude criterion is larger than the pulse width of the impulse response signal or not, and obtaining a second judgment result;
if the second judgment result shows that the peak value after the amplitude criterion is the same as the target to be detected, the target to be detected corresponding to the peak value after the amplitude criterion is determined to be the single fish;
if the second judgment result indicates no, shortening the bandwidth and the pulse width of the impulse response signal, and carrying out pulse compression and envelope calculation on the echo signal by utilizing the modified bandwidth to obtain a modified envelope signal;
taking the modified envelope signal as an envelope signal and taking the modified pulse width as the pulse width of the impulse response signal until all targets to be detected are identified; the bandwidth of the impulse response signal is an even multiple of the modified bandwidth; the pulse width of the impact response signal is an even multiple of the modified pulse width;
if the first judgment result indicates no, determining that the target to be detected is a fish swarm.
Optionally, based on an amplitude criterion, judging whether the peak value of the envelope signal accords with an amplitude range of a target to be detected, to obtain a first judgment result, specifically including:
and based on an amplitude criterion, selecting sampling points with the size of np as windows to search local maximum values of the envelope signals, and judging whether the peak value of the envelope signals accords with the amplitude range of a target to be detected or not to obtain a first judging result.
Optionally, the bandwidth of the impulse response signal is shortened in equal proportion to the pulse width of the impulse response signal.
Optionally, the bandwidth of the impulse response signal and the number of changes in the pulse width of the impulse response signal are determined based on the transmission bandwidth of the transducer and the length of the transmission pulse width.
A multi-line Cheng Kuandai signal monomer recognition system comprising:
the pulse compression module is used for carrying out full-bandwidth pulse compression and wrapping on the echo signal of the target to be tested based on the bandwidth and the pulse width of the impulse response signal of the receiver to obtain an envelope signal; the echo signal is a signal returned after the receiver receives the primary linear frequency modulation signal transmitted by the transducer to the target to be detected; the bandwidth of the impulse response signal is equal to the emission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the emission pulse width of the transducer;
the first judging module is used for judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected or not based on an amplitude criterion to obtain a first judging result;
the peak value determining module after the amplitude criterion is passed is used for determining the peak value of the envelope signal which accords with the amplitude range of the target to be detected as the peak value after the amplitude criterion if the first judging result is indicated as yes;
the second judging module is used for judging whether the peak value interval of the adjacent peak values after the amplitude criterion is larger than the pulse width of the impulse response signal or not, so as to obtain a second judging result;
the single fish determining module is used for determining that the target to be detected corresponding to the peak value after the amplitude criterion is the single fish if the second judging result is yes;
the bandwidth and pulse changing module is used for shortening the bandwidth and the pulse width of the impulse response signal if the second judging result is not indicated, and carrying out pulse compression on the echo signal by utilizing the modified bandwidth and solving an envelope to obtain a modified envelope signal;
the identification module is used for taking the modified envelope signal as an envelope signal and taking the modified pulse width as the pulse width of the impact response signal until all objects to be detected are identified; the bandwidth of the impulse response signal is an even multiple of the modified bandwidth; the pulse width of the impact response signal is an even multiple of the modified pulse width;
and the fish swarm determining module is used for determining that the target to be detected is a fish swarm if the first judging result indicates no.
Optionally, the first judging module specifically includes:
and the local maximum searching unit is used for searching the local maximum of the envelope signal by selecting sampling points with the window size of np based on an amplitude criterion, judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected, and obtaining a first judging result.
Optionally, the bandwidth of the impulse response signal is shortened in equal proportion to the pulse width of the impulse response signal.
Optionally, the bandwidth of the impulse response signal and the number of changes in the pulse width of the impulse response signal are determined by the transmit bandwidth of the transducer and the length of the transmit pulse width.
An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the multi-line Cheng Kuandai signal monomer identification method described above.
Optionally, the memory is a non-transitory computer readable storage medium, and the non-transitory computer readable storage medium stores a computer program, and the computer program when executed by the processor implements the multi-line Cheng Kuandai signal monomer identification method.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the method comprises the steps of transmitting a primary linear frequency modulation signal to a target to be detected by using a transducer, carrying out full-bandwidth pulse compression and envelope calculation on an echo signal of the target to be detected based on the bandwidth and the pulse width of an impulse response signal of a receiver, obtaining an envelope signal, and determining the type of the target to be detected by changing the bandwidth and the pulse width of the impulse response signal for a plurality of times, wherein the type comprises single fish and fish shoals; each time the bandwidth of the impulse response signal is shortened, the pulse width can identify the object to be measured that is closer to the transducer. The invention can identify the type of the target to be detected by only transmitting the long pulse width once by using the transducer, does not need to repeatedly transmit the bandwidth of different signals to detect different distances, does not need to repeatedly transmit the pulse width many times, reduces the transmitting frequency and improves the monomer identification efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for identifying a multi-line Cheng Kuandai signal monomer according to an embodiment of the invention;
fig. 2 is a flowchart of a multi-line Cheng Kuandai signal monomer recognition method according to a second embodiment of the present invention;
FIG. 3 is a schematic diagram of a fish school and monomers and transducers corresponding to pulse compression of different bandwidths; wherein (a) in fig. 3 is a schematic diagram of a fish school and a monomer at a distance from the transducer;
FIG. 3 (b) is a schematic diagram of a fish school with a minimum resolvable distance in the range of cT'/2 to cT/2;
fig. 3 (c) is a schematic diagram of a fish school and monomers closer to the transducer;
FIG. 4 is a graph of simulated identification results when the individual fish and the fish school are at the distance from the transducer location in FIG. 3 (a); wherein (a) in fig. 4 is a sig signal simulation diagram; fig. 4 (b) is a peak lookup diagram; FIG. 4 (c) is a schematic diagram of a monomer target screened out by full bandwidth pulse compression;
FIG. 5 is a graph of simulated identification results when the individual fish and the fish school are at the distance from the transducer location in FIG. 3 (b); wherein (a) in fig. 5 is a sig signal simulation diagram; fig. 5 (b) is a full bandwidth peak lookup diagram; FIG. 5 (c) is a schematic diagram of a monomer target screened out by full bandwidth pulse compression; fig. 5 (d) is a half bandwidth peak lookup diagram; FIG. 5 (e) is a schematic diagram of a monomer target screened out by half-bandwidth pulse compression;
FIG. 6 is a graph of simulated identification results when the individual fish and the fish school are at the distance from the transducer location in FIG. 3 (c); wherein (a) in fig. 6 is a sig signal simulation diagram; fig. 6 (b) is a full bandwidth peak lookup diagram; FIG. 6 (c) is a schematic diagram of a monomer target screened out by full bandwidth pulse compression; fig. 6 (d) is a half bandwidth peak lookup diagram;
FIG. 6 (e) is a schematic diagram of a monomer target screened out by half-bandwidth pulse compression; fig. 6 (f) is a 1/4 bandwidth peak lookup diagram; FIG. 6 (g) is a schematic diagram of the monomer targets screened by 1/4 bandwidth pulse compression.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
The invention aims to provide a method, a system and equipment for identifying monomers of multi-line Cheng Kuandai signals, which reduce the transmitting frequency and improve the monomer identification efficiency.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1, the present invention provides a method for identifying a multi-line Cheng Kuandai signal monomer, which includes:
step 101: based on the bandwidth and the pulse width of an impulse response signal of the receiver, carrying out full-bandwidth pulse compression on an echo signal of a target to be detected and carrying out wrapping to obtain an envelope signal; the echo signal is a signal returned after the receiver receives the primary linear frequency modulation signal transmitted by the transducer to the target to be detected; the bandwidth of the impulse response signal is equal to the emission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the emission pulse width of the transducer.
Step 102: based on the amplitude criterion, it is determined whether the peak value of the envelope signal meets the amplitude range of the target to be measured, if yes, step 103 is executed, and if not, step 108 is executed.
Step 103: and determining the peak value of the envelope signal which accords with the amplitude range of the target to be detected as the peak value after the amplitude criterion.
Step 104: and judging whether the peak value interval of the adjacent peak values after the amplitude criterion is larger than the pulse width of the impulse response signal, if so, executing the step 105, and if not, executing the step 106.
Step 105: and determining that the target to be detected corresponding to the peak value after the amplitude criterion is the single fish.
Step 106: and shortening the bandwidth and the pulse width of the impulse response signal, and carrying out pulse compression on the echo signal by utilizing the modified bandwidth and solving an envelope to obtain a modified envelope signal.
Step 107: taking the modified envelope signal as an envelope signal and taking the modified pulse width as the pulse width of the impulse response signal until all targets to be detected are identified; the bandwidth of the impulse response signal is an even multiple of the modified bandwidth; the pulse width of the impact response signal is an even multiple of the modified pulse width;
step 108: and determining the target to be detected as a fish swarm.
In practical application, step 102 specifically includes: and based on an amplitude criterion, selecting sampling points with the size of np as windows to search local maximum values of the envelope signals, and judging whether the peak value of the envelope signals accords with the amplitude range of a target to be detected or not to obtain a first judging result.
In practical application, the bandwidth of the impulse response signal is shortened in an equal proportion to the pulse width of the impulse response signal.
In practical applications, the bandwidth of the impulse response signal and the number of changes in the pulse width of the impulse response signal are determined based on the transmission bandwidth of the transducer and the length of the transmission pulse width.
Example two
Taking the bandwidth and pulse width of the modified twice impulse response signal as an example, as shown in fig. 2.
1) The transmission pulse width and bandwidth of the split beam transducer can be selected according to the requirements, and the effect of selecting longer pulse width and bandwidth is more obvious. The transducer transmits a linear frequency modulation signal with the bandwidth of bw and the pulse width of T, and the echo signal received by the receiver is sig.
2) And carrying out full-bandwidth pulse compression on the echo signal sig and obtaining an envelope to obtain an envelope signal sigEnv.
3) And selecting a sampling point with the size of the window np to search the local maximum value, and judging whether the peak value accords with the amplitude range of the target to be detected or not to obtain a peak value pks after the amplitude criterion.
4) Sequentially judging whether the interval between two adjacent peaks is larger than the emission pulse width T, namely judging pks i+1 -pks i >T, if the condition is met, the previous peak value is a single target, otherwise, the target to be detected is determined to be a group; where i is the number of peaks identified as matching filtering that meets the peak condition.
If the peak pks is out of condition after screening i Then a new pulse compression is started.
5) Bandwidth B of impulse response signal of receiver for half bandwidth pulse compression of sig 2 Pulse width T' =t/2, and the signal after pulse pressure to obtain envelope is sigEnv 2 。
6) And selecting a sampling point with the size of np as a window to search a local maximum value, and judging whether the peak value accords with the amplitude range of the target to be detected to obtain a peak value pks' after the amplitude criterion.
7) Sequentially judging whether the interval between two adjacent peaks is larger than the emission pulse width T ' and smaller than T, namely T ' is less than or equal to pks ' i+1 -pks' i <T, if the condition is met, the previous peak value is a monomer target, otherwise, the previous peak value is a group; if the peak value pks 'which is not qualified after screening' i A new pulse compression is started.
8) Bandwidth B of impulse response signal of 1/4 bandwidth pulse compression receiver for sig 4 Pulse width T "=t/4, and the signal after pulse pressure to obtain envelope is sigEnv 4 。
9) And selecting a sampling point with the size of the window of np to search a local maximum value, and judging whether the peak value accords with the amplitude range of the target to be detected or not to obtain a peak value pks after the amplitude criterion.
10 Whether the interval between two adjacent peaks is larger than the emission pulse width T 'and smaller than T', namely T 'is smaller than pks'; i+1 -pks” i <and T', if the result is met, the previous peak value is a single object, otherwise, the result is a group, and the judgment is finished.
11 If the bandwidth is longer, the 1/8 bandwidth pulse compression can be performed again, and the method is not limited to the 1/4 bandwidth pulse compression.
It can be seen that the transducer emits a long pulse width once, and the single targets in the following three ranges can be respectively screened by using the method, as shown in fig. 3, wherein (a) in fig. 3 is a single body and a fish shoal at a far distance, at this time, the minimum distinguishable distance of the transducer is cT/2, pulse pressure can be performed by using the full bandwidth, and then the distinction is performed, wherein c is the speed of sound wave propagation in water, and 1500m/s is taken.
In fig. 3 (b), the fish population with the smallest distinguishable distance being in the range of cT'/2 to cT/2 cannot be distinguished after full-bandwidth pulse pressure, and half-bandwidth pulse pressure is required.
In fig. 3, (c) is a fish group and a monomer which are closer to the transducer, namely, a fish group in the range of cT "/2 to cT'/2 with the minimum distinguishable distance, 1/4 bandwidth is needed to perform pulse pressure, and if the fish group and the monomer which are closer to the transducer are needed to be further distinguished, pulse compression with bandwidths of 1/8, 1/16 and the like can be performed under the condition that the original transmission pulse width length allows.
When simulation is carried out, the center frequency is 200kHz, the bandwidth is 100kHz, the pulse width is 8ms, the sampling frequency fs=2MHz, the signal to noise ratio is 5dB, the number of simulated fish shoals is 30, and the target intensity is randomly selected from-45 dB to-35 dB.
When the fish school and the single fish are in the position shown in fig. 3 (a), the extreme situation is simulated, that is, the fish school and the single fish are separated by the minimum resolution distance of the transducer of about cT/2=6m, the single recognition result after full bandwidth pulse compression is shown in fig. 4, and the pulse compression result of the corresponding single echo signal shown by the black dot in fig. 4 is that: envelope; the solid line of (b) in fig. 4 represents matched filtering, and the solid line of (c) in fig. 4 represents full bandwidth pulse compression.
When the fish school and the single fish are in the position shown in (b), the extreme situation is simulated, that is, the fish school is separated from the single fish by the minimum resolution distance of the transducer of about cT'/2=3m, and the single fish school is identified after full-bandwidth and half-bandwidth pulse compression, as shown in fig. 5, the single fish school can be identified by only half-bandwidth pulse compression, and the pulse compression result of the corresponding single echo signal shown by the black dot in fig. 5 is: envelope; the solid lines of (b) in fig. 5 and (d) in fig. 5 represent matched filtering, the solid line of (c) in fig. 5 represents full bandwidth pulse compression, and the solid line of (e) in fig. 5 represents half bandwidth pulse compression.
When the fish school and the single fish are in the position shown in (c), the extreme situation is simulated, that is, the fish school is separated from the single fish by the minimum resolution distance of the transducer of about cT "/2=1.5m, and the single fish school is identified by pulse compression with full bandwidth, half bandwidth and 1/4 bandwidth, as shown in fig. 6, the single fish school can be identified by pulse compression with only 1/4 bandwidth, and the pulse compression result of the echo signal of the corresponding single fish school shown by the black dot in fig. 6 is: envelope; the solid lines of (b) in fig. 6, (d) in fig. 6, and (f) in fig. 6 represent matched filtering, the solid line of (c) in fig. 6 represents full-bandwidth pulse compression, the solid line of (e) in fig. 6 represents half-bandwidth pulse compression, and the solid line of (g) in fig. 6 represents 1/4-bandwidth pulse compression.
In fig. 4-6, time is plotted on the abscissa, in ms, and amplitude is plotted on the ordinate.
Example III
In order to perform a corresponding method of the above embodiment to achieve the corresponding functions and technical effects, a multi-line Cheng Kuandai signal monomer recognition system is provided below.
A multi-line Cheng Kuandai signal monomer recognition system comprising:
the pulse compression module is used for carrying out full-bandwidth pulse compression and wrapping on the echo signal of the target to be tested based on the bandwidth and the pulse width of the impulse response signal of the receiver to obtain an envelope signal; the echo signal is a signal returned after the receiver receives the primary linear frequency modulation signal transmitted by the transducer to the target to be detected; the bandwidth of the impulse response signal is equal to the emission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the emission pulse width of the transducer.
The first judging module is used for judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected based on the amplitude criterion, and obtaining a first judging result.
And the peak value determining module after the amplitude criterion is passed is used for determining the peak value of the envelope signal which accords with the amplitude range of the target to be detected as the peak value after the amplitude criterion if the first judging result is indicated as yes.
And the second judging module is used for judging whether the peak value interval of the adjacent peak values after the amplitude criterion is larger than the pulse width of the impact response signal or not, so as to obtain a second judging result.
And the single fish determining module is used for determining that the target to be detected corresponding to the peak value after the amplitude criterion is the single fish if the second judging result shows that the peak value is the single fish.
And the bandwidth and pulse changing module is used for shortening the bandwidth and the pulse width of the impulse response signal if the second judging result is not indicated, and carrying out pulse compression on the echo signal by utilizing the modified bandwidth and solving an envelope to obtain a modified envelope signal.
The identification module is used for taking the modified envelope signal as an envelope signal and taking the modified pulse width as the pulse width of the impact response signal until all objects to be detected are identified; the bandwidth of the impulse response signal is an even multiple of the modified bandwidth; the pulse width of the impulse response signal is an even multiple of the modified pulse width.
And the fish swarm determining module is used for determining that the target to be detected is a fish swarm if the first judging result indicates no.
In practical application, the first judging module specifically includes: and the local maximum searching unit is used for searching the local maximum of the envelope signal by selecting sampling points with the window size of np based on an amplitude criterion, judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected, and obtaining a first judging result.
In practical applications, the bandwidth of the impulse response signal is reduced in equal proportion to the pulse width of the impulse response signal.
In practical applications, the bandwidth of the impulse response signal and the number of changes in the pulse width of the impulse response signal are determined by the transmit bandwidth of the transducer and the length of the transmit pulse width.
Example IV
An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the multi-line Cheng Kuandai signal monomer identification method described above.
A computer readable storage medium storing a computer program which when executed by a processor implements the multi-line Cheng Kuandai signal monomer identification method described above.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (10)
1. A method for identifying a single multi-line Cheng Kuandai signal, comprising:
based on the bandwidth and the pulse width of an impulse response signal of the receiver, carrying out full-bandwidth pulse compression on an echo signal of a target to be detected and carrying out wrapping to obtain an envelope signal; the echo signal is a signal returned after the receiver receives the primary linear frequency modulation signal transmitted by the transducer to the target to be detected; the bandwidth of the impulse response signal is equal to the emission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the emission pulse width of the transducer;
judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected or not based on an amplitude criterion to obtain a first judgment result;
if the first judgment result shows that the first judgment result is yes, determining the peak value of the envelope signal which accords with the amplitude range of the target to be detected as the peak value after the amplitude criterion;
judging whether the peak value interval between the adjacent peak values after the amplitude criterion is larger than the pulse width of the impulse response signal or not, and obtaining a second judgment result;
if the second judgment result shows that the peak value after the amplitude criterion is the same as the target to be detected, the target to be detected corresponding to the peak value after the amplitude criterion is determined to be the single fish;
if the second judgment result indicates no, shortening the bandwidth and the pulse width of the impulse response signal, and carrying out pulse compression and envelope calculation on the echo signal by utilizing the modified bandwidth to obtain a modified envelope signal;
taking the modified envelope signal as an envelope signal and taking the modified pulse width as the pulse width of the impulse response signal until all targets to be detected are identified; the bandwidth of the impulse response signal is an even multiple of the modified bandwidth; the pulse width of the impact response signal is an even multiple of the modified pulse width;
if the first judgment result indicates no, determining that the target to be detected is a fish swarm.
2. The method for identifying a single multi-line Cheng Kuandai signal according to claim 1, wherein determining whether the peak value of the envelope signal meets the range of the amplitude of the target to be detected based on the amplitude criterion, to obtain the first determination result, specifically comprises:
and based on an amplitude criterion, selecting sampling points with the size of np as windows to search local maximum values of the envelope signals, and judging whether the peak value of the envelope signals accords with the amplitude range of a target to be detected or not to obtain a first judging result.
3. The method of claim 1, wherein the bandwidth of the impulse response signal is reduced in equal proportion to the pulse width of the impulse response signal.
4. The method of claim 1, wherein the bandwidth of the impulse response signal and the number of changes in the impulse response signal's pulse width are determined based on the transmit bandwidth of the transducer and the length of the transmit pulse width.
5. A multi-line Cheng Kuandai signal cell identification system, comprising:
the pulse compression module is used for carrying out full-bandwidth pulse compression and wrapping on the echo signal of the target to be tested based on the bandwidth and the pulse width of the impulse response signal of the receiver to obtain an envelope signal; the echo signal is a signal returned after the receiver receives the primary linear frequency modulation signal transmitted by the transducer to the target to be detected; the bandwidth of the impulse response signal is equal to the emission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the emission pulse width of the transducer;
the first judging module is used for judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected or not based on an amplitude criterion to obtain a first judging result;
the peak value determining module after the amplitude criterion is passed is used for determining the peak value of the envelope signal which accords with the amplitude range of the target to be detected as the peak value after the amplitude criterion if the first judging result is indicated as yes;
the second judging module is used for judging whether the peak value interval between the adjacent peak values after the amplitude criterion is larger than the pulse width of the impulse response signal or not, so as to obtain a second judging result;
the single fish determining module is used for determining that the target to be detected corresponding to the peak value after the amplitude criterion is the single fish if the second judging result is yes;
the bandwidth and pulse changing module is used for shortening the bandwidth and the pulse width of the impulse response signal if the second judging result is not indicated, and carrying out pulse compression on the echo signal by utilizing the modified bandwidth and solving an envelope to obtain a modified envelope signal;
the identification module is used for taking the modified envelope signal as an envelope signal and taking the modified pulse width as the pulse width of the impact response signal until all objects to be detected are identified; the bandwidth of the impulse response signal is an even multiple of the modified bandwidth; the pulse width of the impact response signal is an even multiple of the modified pulse width;
and the fish swarm determining module is used for determining that the target to be detected is a fish swarm if the first judging result indicates no.
6. The multi-line Cheng Kuandai signal monomer identification system of claim 5, wherein the first determining module comprises:
and the local maximum searching unit is used for searching the local maximum of the envelope signal by selecting sampling points with the window size of np based on an amplitude criterion, judging whether the peak value of the envelope signal accords with the amplitude range of the target to be detected, and obtaining a first judging result.
7. The multi-line Cheng Kuandai signal cell identification system of claim 5, wherein the bandwidth of the impulse response signal is reduced in equal proportion to the pulse width of the impulse response signal.
8. The multi-line Cheng Kuandai signal cell identification system of claim 5, wherein the bandwidth of the impulse response signal and the number of changes in the pulse width of the impulse response signal are determined by the transmit bandwidth of the transducer and the length of the transmit pulse width.
9. An electronic device comprising a memory for storing a computer program and a processor that runs the computer program to cause the electronic device to perform the multi-line Cheng Kuandai signal monomer identification method of any one of claims 1-4.
10. The electronic device of claim 9, wherein the memory is a non-transitory computer readable storage medium storing a computer program that when executed by a processor implements the multi-line Cheng Kuandai signal monomer identification method of any one of claims 1-4.
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