CN117572437A - A multi-threaded broadband signal unit identification method, system and equipment - Google Patents

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

A multi-threaded broadband signal unit identification method, system and equipment

Technical field

The present invention relates to the field of broadband signal single target recognition, and in particular to a multi-threaded broadband signal single target recognition method, system and equipment.

Background technique

Cell identification technology refers to the process of using acoustic signals to calculate cell echo signals to detect, identify and track the target to be measured. Single body echo signal calculation is widely used in different fields, mainly including calculating the position, speed and size of the target by analyzing the acoustic characteristics of the echo signal in radar technology; using ultrasonic waves to detect defects and cracks in materials in non-destructive testing etc.; used in geological exploration to understand underground geology; in sonar technology, it mainly realizes the detection, positioning and tracking of underwater targets, etc.

In marine fisheries, the calculation of single echo signals is mainly used for fish detection and positioning. Different types of fish are identified through the intensity and time delay of the echo signals, so as to assess their distribution and quantity, and at the same time, inferences can be made. The size and density of fish stocks play a crucial role in fisheries management and the implementation of sustainable fisheries.

Split-beam technology is often used to establish models for acoustic measurement of various fish due to its advantages of high target positioning accuracy, strong anti-interference, and high spatial resolution. Broadband signals have the characteristics of large frequency bands, high transmission rates, not susceptible to interference such as multipath fading, and can transmit multiple narrowband signals simultaneously, and are widely used in the identification of single signals. The phase standard deviation of the traditional single target recognition of narrowband signals is an important indicator for single target recognition and detection. However, due to the influence of the time variation of the broadband phase difference, the calculation of the phase standard deviation will no longer be valid.

The existing amplitude criterion used to judge single signals is mainly used in narrowband, and the judgment of broadband signals after pulse pressure is not yet perfect. Targets at different distances can only be detected by continuously changing the pulse width of the transmitted signal. Then, perform pulse compression. If there are no fish in the detection area or the single unit and fish are close to the transducer due to the long emission pulse width, and the effective single unit signal cannot be screened out after the pulse pressure, it is necessary to Changing the pulse width of the transmitted signal for repeated detection is more time-consuming. When the transmission interval is long, the fish may move when the next signal arrives, which will result in the target still being unable to be detected, and the transmission pulse width still needs to be adjusted to detect again.

Contents of the invention

The purpose of the present invention is to provide a multi-threaded broadband signal monomer identification method, system and equipment to solve the problem of repeatedly adjusting the transmission signal bandwidth to detect unknown sea areas, resulting in high transmission frequency and low monomer identification efficiency.

In order to achieve the above objects, the present invention provides the following solutions:

A multi-threaded broadband signal unit identification method, including:

Based on the bandwidth and pulse width of the impulse response signal of the receiver, the echo signal of the target to be measured is subjected to full-bandwidth pulse compression and envelope is obtained to obtain the envelope signal; the echo signal is received by the receiver and transmitted by the transducer The signal returned after a linear frequency modulation signal reaches the target to be measured; 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 ;

Based on the amplitude criterion, determine whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, and obtain the first judgment result;

If the first judgment result indicates yes, determine the peak value of the envelope signal that conforms to the amplitude range of the target to be measured as the peak value after passing the amplitude criterion;

Determine whether the peak interval between adjacent peaks after passing the amplitude criterion is greater than the pulse width of the impulse response signal, and obtain a second judgment result;

If the second judgment result indicates yes, it is determined that the target to be measured corresponding to the previous peak after passing the amplitude criterion is a single fish;

If the second judgment result indicates no, shorten the bandwidth and pulse width of the impulse response signal, and use the modified bandwidth to perform pulse compression on the echo signal and find the envelope to obtain the modified envelope signal. ;

The modified envelope signal is used as the envelope signal, and the modified pulse width is used as the pulse width of the impulse response signal until all targets to be measured are identified; the bandwidth of the impulse response signal is the modified bandwidth Even multiples; the pulse width of the impulse response signal is an even multiple of the modified pulse width;

If the first judgment result indicates no, it is determined that the target to be measured is a school of fish.

Optionally, based on the amplitude criterion, determine whether the peak value of the envelope signal meets the amplitude range of the target to be measured, and obtain the first judgment result, which specifically includes:

Based on the amplitude criterion, a sampling point with a window size of np is selected to perform a local maximum search on the envelope signal, and it is judged whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, and the first judgment result is obtained.

Optionally, the bandwidth of the impulse response signal and the pulse width of the impulse response signal are shortened in equal proportion.

Optionally, the number of changes of the bandwidth of the impulse response signal and the pulse width of the impulse response signal is determined based on the emission bandwidth of the transducer and the length of the emission pulse width.

A multi-threaded broadband signal unit identification system, including:

The pulse compression module is used to perform full-bandwidth pulse compression on the echo signal of the target to be measured based on the bandwidth and pulse width of the receiver's impulse response signal and find the envelope to obtain the envelope signal; the echo signal is obtained by using the receiver Receive the signal returned after the linear frequency modulation signal is emitted once by the transducer to the target to be measured; the bandwidth of the impulse response signal is equal to the transmission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the frequency modulation signal of the transducer. The emission pulse width of the energizer;

The first judgment module is used to judge whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured based on the amplitude criterion, and obtain the first judgment result;

a peak value determination module after passing the amplitude criterion, configured to determine the peak value of the envelope signal that conforms to the amplitude range of the target to be measured as the peak value after passing the amplitude criterion if the first judgment result is expressed as yes;

The second judgment module is used to judge whether the peak interval of adjacent peaks after passing the amplitude criterion is greater than the pulse width of the impulse response signal, and obtain a second judgment result;

A single fish determination module, configured to determine that the target to be measured corresponding to the previous peak after passing the amplitude criterion is a single fish if the second judgment result indicates yes;

Bandwidth and pulse changing module, configured to shorten the bandwidth and pulse width of the impulse response signal if the second judgment result is negative, and use the modified bandwidth to perform pulse compression on the echo signal and find the envelope , get the modified envelope signal;

The identification module is used to use the modified envelope signal as the envelope signal, and use the modified pulse width as the pulse width of the impulse response signal until all targets to be measured 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;

A fish school determination module, configured to determine that the target to be measured is a fish school if the first judgment result indicates no.

Optional, the first judgment module specifically includes:

The local maximum value search unit is used to select a sampling point with a window size of np to perform a local maximum value search on the envelope signal based on the amplitude criterion, and determine whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, and obtain The first judgment result.

Optionally, the bandwidth of the impulse response signal is shortened in proportion to the pulse width of the impulse response signal.

Optionally, the number of changes of the bandwidth of the impulse response signal and the pulse width of the impulse response signal is determined by the emission bandwidth of the transducer and the length of the emission pulse width.

An electronic device includes a memory and a processor. The memory is used to store a computer program. The processor runs the computer program to cause the electronic device to execute the above-mentioned multi-threaded broadband signal individual identification method.

Optionally, the memory is a non-transitory computer-readable storage medium, and the non-transitory computer-readable storage medium stores a computer program. When the computer program is executed by the processor, the above-mentioned multi-threaded broadband signal individual recognition is realized. method.

According to the specific embodiments provided by the present invention, the present invention discloses the following technical effects: The present invention uses a transducer to transmit a linear frequency modulation signal to the target to be measured, and responds to the target to be measured based on the bandwidth and pulse width of the impulse response signal of the receiver. The wave signal is subjected to full-bandwidth pulse compression and envelope is obtained to obtain the envelope signal. The type of target to be measured is determined by changing the bandwidth and pulse width of the impulse response signal multiple times. This type includes single fish and fish schools; each shortening The bandwidth and pulse width of the impulse response signal can identify targets closer to the transducer. This invention only uses the transducer to emit a long pulse width once to identify the type of target to be measured. It does not need to repeatedly emit different signal bandwidths to detect different distances. It does not need to emit pulse widths multiple times, which reduces the transmission frequency. Improved single identification efficiency.

Description of the drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings needed to be used in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some of the drawings of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is a flow chart of a multi-threaded broadband signal unit identification method provided by Embodiment 1 of the present invention;

Figure 2 is a flow chart of the multi-threaded broadband signal single identification method provided by Embodiment 2 of the present invention;

Figure 3 is a schematic diagram of fish schools, cells and transducers corresponding to pulse compression of different bandwidths; (a) in Figure 3 is a schematic diagram of fish schools and cells far away from the transducer;

(b) in Figure 3 is a schematic diagram of fish schools in the range of the minimum resolvable distance from cT'/2 to cT/2;

(c) in Figure 3 is a schematic diagram of the fish school and individual fish that are close to the transducer;

Figure 4 is a simulation recognition result diagram when the position of the single fish and fish group distance transducer is at (a) in Figure 3; wherein (a) in Figure 4 is a sig signal simulation diagram; (a) in Figure 4 b) is a peak search diagram; (c) in Figure 4 is a schematic diagram of a single target filtered out through full-bandwidth pulse compression;

Figure 5 is a simulation recognition result diagram when the position of the single fish and fish group distance transducer is at (b) in Figure 3; among them, (a) in Figure 5 is a sig signal simulation diagram; ( in Figure 5 b) is a full-bandwidth peak search diagram; (c) in Figure 5 is a schematic diagram of a single target filtered out through full-bandwidth pulse compression; (d) in Figure 5 is a half-bandwidth peak search diagram; (e) in Figure 5 ) is a schematic diagram of a single target selected through half-bandwidth pulse compression;

Figure 6 is a simulation recognition result diagram when the position of the single fish and fish distance transducer is at (c) in Figure 3; among them, (a) in Figure 6 is a sig signal simulation diagram; ( in Figure 6 b) is a full-bandwidth peak search diagram; (c) in Figure 6 is a schematic diagram of a single target filtered out through full-bandwidth pulse compression; (d) in Figure 6 is a half-bandwidth peak search diagram;

(e) in Figure 6 is a schematic diagram of a single target filtered out through half-bandwidth pulse compression; (f) in Figure 6 is a 1/4-bandwidth peak search diagram; (g) in Figure 6 is a 1/4-bandwidth peak search diagram Schematic diagram of single targets screened out by pulse compression.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

The purpose of the present invention is to provide a multi-threaded broadband signal cell identification method, system and equipment, which reduces the transmission frequency and improves the cell identification efficiency.

In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

As shown in Figure 1, the present invention provides a multi-threaded broadband signal unit identification method, including:

Step 101: Based on the bandwidth and pulse width of the impulse response signal of the receiver, perform full-bandwidth pulse compression on the echo signal of the target to be measured and find the envelope to obtain the envelope signal; the echo signal is received by the receiver. The signal returned after the linear frequency modulation signal is emitted once by the transducer to the target to be measured; the bandwidth of the impulse response signal is equal to the transmission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the pulse width of the transducer. Transmit pulse width.

Step 102: Based on the amplitude criterion, determine whether the peak value of the envelope signal meets the amplitude range of the target to be measured. If yes, execute step 103. If not, execute step 108.

Step 103: Determine the peak value of the envelope signal that conforms to the amplitude range of the target to be measured as the peak value after passing the amplitude criterion.

Step 104: Determine whether the peak interval between adjacent peaks after passing the amplitude criterion is greater than the pulse width of the impulse response signal. If yes, execute step 105. If not, execute step 106.

Step 105: Determine that the target to be measured corresponding to the peak value after passing the amplitude criterion is a single fish.

Step 106: Shorten the bandwidth and pulse width of the impulse response signal, and use the modified bandwidth to perform pulse compression and envelope calculation on the echo signal to obtain a modified envelope signal.

Step 107: Use the modified envelope signal as the envelope signal, and use the modified pulse width as the pulse width of the impulse response signal until all targets to be measured are identified; the bandwidth of the impulse response signal is is an even multiple of the bandwidth; the pulse width of the impulse response signal is an even multiple of the modified pulse width;

Step 108: Determine the target to be measured to be a school of fish.

In practical applications, step 102 specifically includes: based on the amplitude criterion, select a sampling point with a window size of np to perform a local maximum search on the envelope signal, and determine whether the peak value of the envelope signal meets the amplitude of the target to be measured. range, and get the first judgment result.

In practical applications, the bandwidth of the impulse response signal and the pulse width of the impulse response signal are shortened in equal proportions.

In practical applications, the number of changes of the bandwidth of the impulse response signal and the pulse width of the impulse response signal is determined based on the emission bandwidth of the transducer and the length of the emission pulse width.

Embodiment 2

Take changing the bandwidth and pulse width of two impulse response signals as an example, as shown in Figure 2.

1) The pulse width and bandwidth of the split beam transducer can be selected according to the needs. The effect of choosing a longer pulse width and bandwidth will be more obvious. The transducer transmits a chirp signal with a bandwidth of bw and a pulse width of T, and the echo signal received by the receiver is sig.

2) Perform full-bandwidth pulse compression on the echo signal sig and find the envelope to obtain the envelope signal sigEnv.

3) Select the window size to be np sampling points to search for local maximum values, and determine whether the peak value conforms to the amplitude range of the target to be measured to obtain the peak value pks after passing the amplitude criterion.

4) Determine in turn whether the interval between two adjacent peaks is greater than the emission pulse width T, that is, determine pks _i+1 -pks _i >T. If the conditions are met, the previous peak is a single target, otherwise the target to be measured is determined to be a group; where, i is the number of identified matched filtering peaks that meet the peak condition.

If there is no peak pks _i that meets the conditions after screening, a new pulse compression will be started.

5) The bandwidth of the impulse response signal of the half-bandwidth pulse compression receiver for sig is B ₂ =bw/2, the pulse width T' = T/2, and the envelope signal obtained after the pulse pressure is sigEnv ₂ .

6) Select the window size as np sampling point to search for the local maximum value, and determine whether the peak value conforms to the amplitude range of the target to be measured to obtain the peak value pks' after passing the amplitude criterion.

7) Determine in turn whether the interval between two adjacent peaks is greater than the emission pulse width T' and less than T, that is, T'≤pks' _i+1 -pks' _i <T. If the conditions are met, the previous peak is a single target, otherwise it is group; if there is no qualified peak pks' _i after screening, a new pulse compression will be started.

8) The bandwidth of the impulse response signal of the 1/4-bandwidth pulse compression receiver on sig is B ₄ =bw/4, the pulse width T” = T/4, and the envelope signal obtained after the pulse pressure is sigEnv ₄ .

9) Select the window size as np sampling point to search for the local maximum value, and determine whether the peak value conforms to the amplitude range of the target to be measured to obtain the peak value pks after passing the amplitude criterion.

10) Determine in turn whether the interval between two adjacent peaks is greater than the emission pulse width T" and less than T', that is, T"≤pks" _i+1 -pks" _i <T', if satisfied, the previous peak is a single target, otherwise for the group and an end to judgment.

11) If the bandwidth is longer, 1/8 bandwidth pulse compression can be performed again. The method is not limited to pulse compression of 1/4 bandwidth.

It can be seen that the transducer emits a long pulse width, and the present invention can be used to screen out individual targets within the following three ranges, as shown in Figure 3, where (a) in Figure 3 is a target that is farther away. For a single body and a school of fish, the minimum resolvable distance of the transducer at this time is cT/2, and the full bandwidth can be used to perform pulse pressure to distinguish, where c is the speed of sound wave propagation in water, which is taken as 1500m/s.

(b) in Figure 3 shows fish schools in the minimum resolvable distance range of cT'/2 ~ cT/2. They cannot be distinguished after full-bandwidth pulse pressure, so half-bandwidth pulse pressure needs to be used.

(c) in Figure 3 shows fish schools and individuals that are close to the transducer, that is, fish schools in the minimum resolvable distance range of cT”/2 ~ cT’/2, and 1/4 bandwidth needs to be selected. Pulse pressure, if it is necessary to further distinguish fish groups and individuals closer to the transducer, pulse compression with bandwidths of 1/8, 1/16, etc. can be performed if the original emission pulse width length allows.

During simulation, 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 schools is 30, and the target intensity is randomly selected between -45dB and -35dB.

When the fish school and the single fish are in the position shown in (a) in Figure 3, the extreme situation is simulated, that is, the distance between the fish school and the single fish is approximately cT/2=6m, and the minimum resolution distance of the transducer is about cT/2=6m. The cell identification results after bandwidth pulse compression are shown in Figure 4. The black dots in Figure 4 show the pulse compression results corresponding to the cell echo signals, that is, the envelope; the solid line in (b) in Figure 4 represents matching. Filtering, the solid line in (c) in Figure 4 represents full-bandwidth pulse compression.

When the fish school and the single fish are in the position shown in (b) in the figure, the extreme situation is simulated, that is, the distance between the fish school and the single fish is the minimum resolution distance of the transducer, which is approximately cT'/2=3m. The cell identification results after bandwidth and half-bandwidth pulse compression are shown in Figure 5. It can be seen that only half-bandwidth pulse compression can identify the cell. The black dots in Figure 5 correspond to the pulse compression of the cell echo signal. The result is: envelope; the solid lines in (b) and (d) in Figure 5 represent matched filtering, the solid line in (c) in Figure 5 represents full-bandwidth pulse compression, and ( in Figure 5 The solid line in e) represents half-bandwidth pulse compression.

When the fish school and the single fish are in the position shown in (c) in the figure, the extreme situation is simulated, that is, the distance between the fish school and the single fish is the minimum resolution distance of the transducer, which is approximately cT”/2=1.5m. The monomer identification results after full-bandwidth, half-bandwidth, and 1/4-bandwidth pulse compression are shown in Figure 6. It can be seen that only 1/4-bandwidth pulse compression can identify the monomer, and the corresponding black dots in Figure 6 The pulse compression result of the single echo signal, that is, the envelope; the solid lines in (b), (d) and (f) in Figure 6 represent matched filtering, and ( in Figure 6 The solid line in c) represents full-bandwidth pulse compression, the solid line in (e) in Figure 6 represents half-bandwidth pulse compression, and the solid line in (g) in Figure 6 represents 1/4-bandwidth pulse compression.

In Figure 4-Figure 6, the abscissa is time, the unit is ms, and the ordinate is amplitude.

Embodiment 3

In order to execute the method corresponding to the above-mentioned Embodiment 1 and achieve corresponding functions and technical effects, a multi-threaded broadband signal individual identification system is provided below.

A multi-threaded broadband signal unit identification system, including:

The pulse compression module is used to perform full-bandwidth pulse compression on the echo signal of the target to be measured based on the bandwidth and pulse width of the receiver's impulse response signal and find the envelope to obtain the envelope signal; the echo signal is obtained by using the receiver Receive the signal returned after the linear frequency modulation signal is emitted once by the transducer to the target to be measured; the bandwidth of the impulse response signal is equal to the transmission bandwidth of the transducer, and the pulse width of the impulse response signal is equal to the frequency modulation signal of the transducer. The transmitter pulse width.

The first judgment module is used to judge whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured based on the amplitude criterion, and obtain a first judgment result.

The peak value determination module after passing the amplitude criterion is used to determine the peak value of the envelope signal that conforms to the amplitude range of the target to be measured as the peak value after passing the amplitude criterion if the first judgment result indicates yes.

The second judgment module is used to judge whether the peak interval between adjacent peaks after passing the amplitude criterion is greater than the pulse width of the impulse response signal, and obtain a second judgment result.

A single fish determination module, configured to determine that the target to be measured corresponding to the previous peak after passing the amplitude criterion is a single fish if the second judgment result indicates yes.

Bandwidth and pulse changing module, configured to shorten the bandwidth and pulse width of the impulse response signal if the second judgment result is negative, and use the modified bandwidth to perform pulse compression on the echo signal and find the envelope , get the modified envelope signal.

The identification module is used to use the modified envelope signal as the envelope signal, and use the modified pulse width as the pulse width of the impulse response signal until all targets to be measured are identified; the bandwidth of the impulse response signal is The pulse width 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.

A fish school determination module, configured to determine that the target to be measured is a fish school if the first judgment result indicates no.

In practical applications, the first judgment module specifically includes: a local maximum search unit, which is used to select a sampling point with a window size of np to search for the local maximum of the envelope signal based on the amplitude criterion, and determine the envelope. Whether the peak value of the signal conforms to the amplitude range of the target to be measured is the first judgment result.

In practical applications, the bandwidth of the impulse response signal is shortened in 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 of the pulse width of the impulse response signal are determined by the emission bandwidth of the transducer and the length of the emission pulse width.

Embodiment 4

An electronic device includes a memory and a processor. The memory is used to store a computer program. The processor runs the computer program to cause the electronic device to execute the multi-threaded broadband signal individual identification method described above.

A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, the multi-threaded broadband signal single identification method described above is implemented.

Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. As for the system disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For relevant details, please refer to the description in the method section.

This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and the core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the present invention There will be changes in the specific implementation methods and application scope of the ideas. In summary, the contents of this description should not be construed as limitations of the present 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.