A multi-thread wideband signal single identification method, system and device

Abstract

The application provides a multi-thread broadband signal monomer identification method, system and device, and relates to the field of broadband signal monomer target identification. The method comprises the following steps: based on the bandwidth and pulse width of the impact response signal of the receiver, performing full-bandwidth pulse compression on the echo signal of the target to be measured and obtaining an envelope signal by envelope calculation; based on the amplitude criterion, judging whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured; if yes, determining the peak value of the envelope signal conforming to the amplitude range of the target to be measured as the peak value after the amplitude criterion; judging whether the peak value interval between adjacent peak values after the amplitude criterion is greater than the pulse width of the impact response signal; if yes, determining that the target to be measured corresponding to the previous peak value after the amplitude criterion is a monomer fish; if not, shortening the bandwidth and pulse width of the impact response signal and continuing target identification until all the targets to be measured are identified. The application reduces the transmission frequency and improves the monomer identification efficiency.

Description

Technical Field

[0001] This invention relates to the field of broadband signal single-target identification, and in particular to a multi-threaded broadband signal single-target identification method, system, and device. Background Technology

[0002] Single-target identification technology refers to the process of using acoustic signals to calculate the echo signals of individual targets, thereby enabling the detection, identification, and tracking of the target. Single-target echo signal calculation is widely used in various fields, primarily including: in radar technology, calculating the target's position, velocity, and size by analyzing the acoustic characteristics of the echo signals; in non-destructive testing, using ultrasonic waves to detect defects and cracks in materials; in geological exploration, understanding underground geological conditions; and in sonar technology, mainly for detecting, locating, and tracking underwater targets.

[0003] In marine fisheries, the calculation of individual echo signals is mainly used for fish school detection and location. By analyzing the intensity and time delay of the echo signals, different types of fish can be identified, thereby assessing their distribution and quantity. At the same time, the size and density of fish schools can also be inferred, which plays a crucial role in fisheries management and the implementation of sustainable fisheries.

[0004] Split-beam technology, due to its advantages of high target positioning accuracy, strong anti-interference ability, and high spatial resolution, is often used to establish models for various fish acoustic measurements. Wideband signals, with their large bandwidth, high transmission rate, resistance to multipath fading and other interference, and the ability to transmit multiple narrowband signals simultaneously, are widely used in single-target signal identification. The phase standard deviation of traditional narrowband signal single-target identification is an important indicator for single-target identification and detection; however, due to the time-varying nature of the broadband phase difference, the calculation of the phase standard deviation becomes ineffective.

[0005] Existing amplitude criteria for determining individual fish signals are mainly applied to narrowband signals, and their application to wideband signals after pulse compression is not yet perfect. They can only detect targets at different distances by continuously changing the pulse width of the transmitted signal, followed by pulse compression. If there are no fish in the detection area, or if the transmitted pulse width is long but the individual fish are close to the transducer, and a valid individual signal cannot be filtered out after pulse compression, the transmitted pulse width needs to be changed repeatedly for detection, which is time-consuming. When the transmission interval is long, the fish may move when the next signal arrives, resulting in the target still not being detected, and the transmitted pulse width needs to be adjusted again for re-detection. Summary of the Invention

[0006] The purpose of this invention is to provide a multi-threaded broadband signal single-unit identification method, system, and device to solve the problem of high transmission frequency and low single-unit identification efficiency caused by repeatedly adjusting the transmission signal bandwidth for the detection of unknown sea areas.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] A multi-threaded broadband signal single-unit identification method includes:

[0009] Based on the bandwidth and pulse width of the receiver's impulse response signal, the echo signal of the target under test is subjected to full-bandwidth pulse compression and the envelope is calculated to obtain the envelope signal; the echo signal is the signal returned after the transducer transmits a linear frequency modulated signal to the target under test; 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 transmission pulse width of the transducer.

[0010] Based on the amplitude criterion, it is determined whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, and a first judgment result is obtained;

[0011] If the first judgment result is yes, the peak value of the envelope signal that conforms to the amplitude range of the target to be measured is determined as the peak value after the amplitude criterion.

[0012] Determine whether the peak interval between adjacent peaks after the amplitude criterion is greater than the pulse width of the impact response signal to obtain a second determination result;

[0013] If the second judgment result is yes, the target to be measured corresponding to the peak value after the amplitude criterion mentioned above is determined to be a single fish.

[0014] If the second judgment result is negative, the bandwidth and pulse width of the impact response signal are shortened, and the echo signal is pulse-compressed and envelope is calculated using the modified bandwidth to obtain the modified envelope signal.

[0015] The modified envelope signal is used as the envelope signal, and the modified pulse width is used as the pulse width of the impact response signal, until all targets to be tested are identified; the bandwidth of the impact 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.

[0016] If the first judgment result is negative, the target to be tested is determined to be a school of fish.

[0017] Optionally, based on the amplitude criterion, it is determined whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, to obtain a first judgment result, specifically including:

[0018] Based on the amplitude criterion, sampling points with a window size of np are selected to perform local maximum value search on the envelope signal, and it is determined whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, thus obtaining the first judgment result.

[0019] Optionally, the bandwidth and pulse width of the impact response signal can be shortened proportionally.

[0020] Optionally, the bandwidth of the impulse response signal and the number of times the pulse width of the impulse response signal is changed are determined based on the transmission bandwidth of the transducer and the length of the transmission pulse width.

[0021] A multi-threaded broadband signal cell identification system, comprising:

[0022] The pulse compression module is used to perform full-bandwidth pulse compression and calculate the envelope signal of the echo signal from the target under test based on the bandwidth and pulse width of the receiver's impulse response signal. The echo signal is the signal returned after the transducer transmits a linear frequency modulated signal to the target under test. 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 transmission pulse width of the transducer.

[0023] The first judgment module is used to determine whether the peak value of the envelope signal conforms to the amplitude range of the target under test based on the amplitude criterion, and to obtain the first judgment result;

[0024] The peak value determination module after amplitude criterion is used to determine the peak value of the envelope signal that conforms to the amplitude range of the target under test as the peak value after amplitude criterion if the first judgment result is yes.

[0025] The second judgment module is used to determine whether the peak interval between adjacent peaks after the amplitude criterion is greater than the pulse width of the impact response signal, and to obtain the second judgment result.

[0026] The single fish determination module is used to determine the target to be measured corresponding to the peak value after the amplitude criterion mentioned above as a single fish if the second judgment result is yes.

[0027] The bandwidth and pulse modification module is used to shorten the bandwidth and pulse width of the impact response signal if the second judgment result is negative, and to use the modified bandwidth to perform pulse compression on the echo signal and calculate the envelope to obtain the modified envelope signal.

[0028] The identification module is used to take the modified envelope signal as the envelope signal and the modified pulse width as the pulse width of the impact response signal, until all targets to be tested are identified; the bandwidth of the impact 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.

[0029] The fish school determination module is used to determine that the target to be tested is a fish school if the first judgment result is negative.

[0030] Optional, the first judgment module specifically includes:

[0031] The local maximum value search unit is used to select sampling points with a window size of np based on the amplitude criterion to search for local maximum values ​​of the envelope signal, determine whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, and obtain a first judgment result.

[0032] Optionally, the bandwidth of the impact response signal is shortened proportionally to the pulse width of the impact response signal.

[0033] Optionally, the bandwidth of the impact response signal and the number of times the pulse width of the impact response signal changes are determined by the transmission bandwidth of the transducer and the length of the transmission pulse width.

[0034] An electronic device includes a memory and a processor, wherein the memory stores a computer program and the processor runs the computer program to enable the electronic device to perform the above-described multi-threaded broadband signal unit identification method.

[0035] Optionally, the memory is a non-transitory computer-readable storage medium that stores a computer program, which, when executed by a processor, implements the above-described multi-threaded broadband signal unit identification method.

[0036] According to specific embodiments provided by the present invention, the following technical effects are disclosed: The present invention utilizes a transducer to transmit a linear frequency modulated signal to the target under test. Based on the bandwidth and pulse width of the receiver's impulse response signal, the echo signal of the target under test is subjected to full-bandwidth pulse compression and envelope calculation to obtain the envelope signal. The type of the target under test is determined by repeatedly changing the bandwidth and pulse width of the impulse response signal, which includes single fish and schools of fish. Each time the bandwidth and pulse width of the impulse response signal are shortened, the target under test closer to the transducer can be identified. The present invention can identify the type of the target under test by transmitting a long pulse width only once, without the need to repeatedly transmit different signal bandwidths to detect different distances, and without repeatedly transmitting pulse widths, thus reducing the transmission frequency and improving the efficiency of single-target identification. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a flowchart of the multi-threaded broadband signal unit identification method provided in Embodiment 1 of the present invention;

[0039] Figure 2 This is a flowchart of the multi-threaded broadband signal unit identification method provided in Embodiment 2 of the present invention;

[0040] Figure 3 Schematic diagrams of fish swarms and individual fish cells with transducers corresponding to pulse compression of different bandwidths; among them, Figure 3 (a) in the diagram shows a school of fish and individual fish at a distance from the transducer;

[0041] Figure 3 (b) in the diagram is a schematic diagram of a school of fish in the range of minimum resolvable distance cT' / 2 to cT / 2;

[0042] Figure 3 (c) in the diagram shows a group of fish and individual fish that are close to the transducer.

[0043] Figure 4 When a single fish or a school of fish is at a distance from the transducer position Figure 3 The simulation recognition result diagram for time (a) is shown in the figure; where, Figure 4 (a) in the diagram is a simulation of the sig signal; Figure 4 (b) in the image is the peak lookup map; Figure 4 (c) in the diagram is a schematic diagram of a single target selected by full-bandwidth pulse compression;

[0044] Figure 5 When a single fish or a school of fish is at a distance from the transducer position Figure 3 The simulation recognition result diagram for time (b) is shown in the figure; where, Figure 5 (a) in the diagram is a simulation of the sig signal; Figure 5 (b) in the diagram is the full bandwidth peak lookup graph; Figure 5 (c) in the diagram is a schematic diagram of a single target selected by full-bandwidth pulse compression; Figure 5 (d) in the graph represents the half-bandwidth peak lookup map; Figure 5 (e) in the diagram is a schematic of a single target selected by half-bandwidth pulse compression;

[0045] Figure 6 When a single fish or a school of fish is at a distance from the transducer position Figure 3 The simulation recognition result diagram at time (c) is shown; where, Figure 6 (a) in the diagram is a simulation of the sig signal; Figure 6 (b) in the diagram is the full bandwidth peak lookup graph; Figure 6 (c) in the diagram is a schematic diagram of a single target selected by full-bandwidth pulse compression; Figure 6 (d) in the graph represents the half-bandwidth peak lookup map;

[0046] Figure 6 (e) in the diagram is a schematic of a single target selected by half-bandwidth pulse compression; Figure 6 (f) in the diagram represents the peak lookup graph for 1 / 4 bandwidth. Figure 6 (g) in the diagram is a schematic of a single target selected by 1 / 4 bandwidth pulse compression. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] The purpose of this invention is to provide a method, system, and device for identifying individual units of multi-threaded broadband signals, which reduces the transmission frequency and improves the efficiency of individual unit identification.

[0049] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0050] like Figure 1 As shown, the present invention provides a method for identifying individual units of multi-threaded broadband signals, comprising:

[0051] Step 101: Based on the bandwidth and pulse width of the receiver's impulse response signal, perform full-bandwidth pulse compression on the echo signal of the target under test and calculate the envelope to obtain the envelope signal; the echo signal is the signal returned after the transducer transmits a linear frequency modulated signal to the target under test using the receiver; 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 transmission pulse width of the transducer.

[0052] Step 102: 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. If yes, proceed to step 103; otherwise, proceed to step 108.

[0053] Step 103: Determine the peak value of the envelope signal that conforms to the amplitude range of the target under test as the peak value after amplitude criterion.

[0054] Step 104: Determine whether the peak interval between adjacent peaks after the amplitude criterion is greater than the pulse width of the impact response signal. If yes, proceed to step 105; otherwise, proceed to step 106.

[0055] Step 105: Determine that the target to be measured corresponding to the peak value after the amplitude criterion mentioned above is a single fish.

[0056] Step 106: 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 calculate the envelope to obtain the modified envelope signal.

[0057] Step 107: Use the modified envelope signal as the envelope signal and the modified pulse width as the pulse width of the impact response signal until all targets to be tested are identified; the bandwidth of the impact 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.

[0058] Step 108: Determine that the target to be tested is a school of fish.

[0059] In practical applications, step 102 specifically includes: based on the amplitude criterion, selecting sampling points with a window size of np to perform local maximum value search on the envelope signal, determining whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, and obtaining a first judgment result.

[0060] In practical applications, the bandwidth and pulse width of the impact response signal are shortened proportionally.

[0061] In practical applications, the bandwidth of the impulse response signal and the number of times the pulse width of the impulse response signal is changed are determined based on the transmission bandwidth and the length of the transmission pulse width of the transducer.

[0062] Example 2

[0063] Taking the alteration of the bandwidth and pulse width of the two impulse response signals as an example, such as... Figure 2 As shown.

[0064] 1) The transmit pulse width and bandwidth of the split beam transducer can be selected according to requirements. The effect of selecting a longer pulse width and bandwidth will be more obvious. The transducer transmits a linear frequency modulated signal with a bandwidth of bw and a pulse width of T. The echo signal received by the receiver is sig.

[0065] 2) Perform full-bandwidth pulse compression on the echo signal sig and calculate the envelope to obtain the envelope signal sigEnv.

[0066] 3) Select a window size of np sampling points to find local maximum values, and determine whether the peak value meets the amplitude range of the target to be measured to obtain the peak value pks after the amplitude criterion.

[0067] 4) Sequentially determine whether the interval between two adjacent peaks is greater than the transmitted pulse width T, i.e., determine pks. i+1 -pks i If the condition is met, the previous peak value is a single target; otherwise, the target to be tested is determined to be a group. Where i is the number of peak values ​​that meet the peak value condition and are identified by matched filtering.

[0068] If there is no qualified peak pks after screening i , then a new pulse compression is started.

[0069] 5) For the impulse response signal of a half-bandwidth pulse compression receiver for sig, the bandwidth B2=bw / 2, the pulse width T'=T / 2, and the signal obtained by extracting the envelope after pulse compression is sigEnv2.

[0070] 6) Select a window size of np sampling points to search for local maxima, and judge whether the peak conforms to the amplitude range of the target to be measured to obtain the peak pks' after passing the amplitude criterion.

[0071] 7) Judge sequentially whether the interval between two adjacent peaks is greater than the transmitted pulse width T' and less than T, that is, T'≤pks' i+1 -pks' i <T, if the condition is satisfied, the previous peak is an individual target, otherwise it is a group target; if there is no qualified peak pks' after screening i then a new pulse compression is started.

[0072] 8) For the impulse response signal of a quarter-bandwidth pulse compression receiver for sig, the bandwidth B4=bw / 4, the pulse width T''=T / 4, and the signal obtained by extracting the envelope after pulse compression is sigEnv4.

[0073] 9) Select a window size of np sampling points to search for local maxima, and judge whether the peak conforms to the amplitude range of the target to be measured to obtain the peak pks'' after passing the amplitude criterion.

[0074] 10) Judge sequentially whether the interval between two adjacent peaks is greater than the transmitted pulse width T'' and less than T', that is, T''≤pks'' i+1 -pks'' i <T', if the condition is satisfied, the previous peak is an individual target, otherwise it is a group target and the judgment is ended.

[0075] 11) If the bandwidth is relatively large, 1 / 8 bandwidth pulse compression can be performed again, and the method is not limited to 1 / 4 bandwidth pulse compression.

[0076] It can be seen that after the transducer transmits a long pulse width once, the present invention can separately screen out individual targets in the following three ranges, such as Figure 3 shown, wherein, Figure 3 (a) in is an individual target and a fish school at a far distance, the minimum resolvable distance of the transducer is cT / 2 at this time, which can be distinguished after pulse compression with the full bandwidth, wherein c is the propagation speed of sound waves in water, taken as 1500 m / s.

[0077] Figure 3In (b), fish groups within the range of cT' / 2 to cT / 2 with the minimum resolvable distance cannot be distinguished after full-bandwidth pulse compression, and half-bandwidth pulse compression is required.

[0078] Figure 3 (c) represents fish groups and individual fish that are close to the transducer, i.e., fish groups within the minimum resolvable distance range of cT” / 2 to cT' / 2. A 1 / 4 bandwidth pulse compression should be selected. If it is necessary to further distinguish between fish groups and individual fish that are even closer to the transducer, pulse compression with bandwidths of 1 / 8, 1 / 16, etc. can be performed if the original transmit pulse width length allows.

[0079] The simulation used a center frequency of 200kHz, a bandwidth of 100kHz, a pulse width of 8ms, a sampling frequency of Fs = 2MHz, a signal-to-noise ratio of 5dB, and simulated a school of 30 fish. The target intensity was randomly selected between -45dB and -35dB.

[0080] When the school of fish and the individual fish are in a state of... Figure 3 At the position shown in (a), the simulation of the extreme case, where the distance between the fish school and the individual fish is approximately cT / 2 = 6m (the minimum resolution distance of the transducer), shows the individual fish identification result after full-bandwidth pulse compression as follows: Figure 4 As shown, Figure 4 The black dots in the middle represent the pulse compression result of the corresponding single echo signal, i.e., the envelope; Figure 4 The solid line in (b) represents matched filtering. Figure 4 The solid line in (c) represents full-bandwidth pulse compression.

[0081] When the school of fish and the individual fish are positioned as shown in Figure (b), the simulation of the extreme case, where the distance between the school of fish and the individual fish is approximately cT' / 2 = 3m (the minimum resolution distance of the transducer), yields the following individual fish identification results after full-bandwidth and half-bandwidth pulse compression: Figure 5 As shown, pulse compression with only half the bandwidth can identify a single cell. Figure 5 The black dots in the middle represent the pulse compression result of the corresponding single echo signal, i.e., the envelope; Figure 5 (b) and Figure 5 The solid line in (d) represents matched filtering. Figure 5 The solid line in (c) represents full-bandwidth pulse compression. Figure 5 The solid line in (e) represents half-bandwidth pulse compression.

[0082] When the school of fish and the individual fish are positioned as shown in Figure (c), the simulation assumes an extreme case where the distance between the school of fish and the individual fish is approximately cT” / 2 = 1.5m, the individual fish identification results after full-bandwidth, half-bandwidth, and 1 / 4-bandwidth pulse compression are as follows: Figure 6 As shown, pulse compression with only 1 / 4 bandwidth can identify a single cell. Figure 6 The black dots in the middle represent the pulse compression result of the corresponding single echo signal, i.e., the envelope; Figure 6 (b) Figure 6 (d) and Figure 6 The solid line in (f) represents matched filtering. Figure 6 The solid line in (c) represents full-bandwidth pulse compression. Figure 6 The solid line in (e) represents half-bandwidth pulse compression. Figure 6 The solid line (g) in the figure represents 1 / 4 bandwidth pulse compression.

[0083] Figures 4-6 The horizontal axis represents time in milliseconds (ms), and the vertical axis represents amplitude.

[0084] Example 3

[0085] In order to implement the method corresponding to Embodiment 1 above and achieve the corresponding functions and technical effects, a multi-threaded broadband signal single-unit identification system is provided below.

[0086] A multi-threaded broadband signal cell identification system, comprising:

[0087] The pulse compression module is used to perform full-bandwidth pulse compression and calculate the envelope signal of the echo signal from the target under test based on the bandwidth and pulse width of the receiver's impulse response signal. The echo signal is the signal returned after the transducer transmits a linear frequency modulated signal to the target under test. 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 transmission pulse width of the transducer.

[0088] The first judgment module is used to determine whether the peak value of the envelope signal conforms to the amplitude range of the target under test based on the amplitude criterion, and to obtain the first judgment result.

[0089] The peak value determination module after amplitude criterion is used to determine the peak value of the envelope signal that conforms to the amplitude range of the target under test as the peak value after amplitude criterion if the first judgment result is yes.

[0090] The second judgment module is used to determine whether the peak interval between adjacent peaks after the amplitude criterion is greater than the pulse width of the impact response signal, and to obtain the second judgment result.

[0091] The single fish determination module is used to determine the target to be measured corresponding to the peak value after the amplitude criterion mentioned above as a single fish if the second judgment result is yes.

[0092] The bandwidth and pulse modification module is used to shorten the bandwidth and pulse width of the impulse response signal if the second judgment result is negative, and to use the modified bandwidth to perform pulse compression on the echo signal and calculate the envelope to obtain the modified envelope signal.

[0093] The identification module is used to take the modified envelope signal as the envelope signal and the modified pulse width as the pulse width of the impact response signal, until all targets to be tested are identified; the bandwidth of the impact 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.

[0094] The fish school determination module is used to determine that the target to be tested is a fish school if the first judgment result is negative.

[0095] In practical applications, the first judgment module specifically includes: a local maximum value search unit, which is used to select sampling points with a window size of np based on the amplitude criterion to perform local maximum value search on the envelope signal, 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.

[0096] In practical applications, the bandwidth of the impact response signal is shortened proportionally to the pulse width of the impact response signal.

[0097] In practical applications, the bandwidth of the impact response signal and the number of times the pulse width of the impact response signal changes are determined by the transmission bandwidth of the transducer and the length of the transmission pulse width.

[0098] Example 4

[0099] An electronic device includes a memory and a processor, wherein the memory stores a computer program, and the processor runs the computer program to enable the electronic device to perform the multi-threaded broadband signal unit identification method described above.

[0100] A computer-readable storage medium storing a computer program that, when executed by a processor, implements the multi-threaded broadband signal unit identification method described above.

[0101] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0102] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for identifying individual units of a multi-threaded broadband signal, characterized in that, include: Based on the bandwidth and pulse width of the receiver's impulse response signal, the echo signal of the target under test is subjected to full-bandwidth pulse compression and the envelope is calculated to obtain the envelope signal. The echo signal is the signal returned after the transducer transmits a linear frequency modulated signal to the target under test, which is received by the receiver; 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 transmission pulse width of the transducer; Based on the amplitude criterion, it is determined whether the peak value of the envelope signal conforms to the amplitude range of the target under test, and a first judgment result is obtained; If the first judgment result is yes, the peak value of the envelope signal that conforms to the amplitude range of the target to be measured is determined as the peak value after the amplitude criterion; Determine whether the peak interval between adjacent peaks after the amplitude criterion is greater than the pulse width of the impact response signal to obtain a second determination result; If the second judgment result is yes, the target to be measured corresponding to the peak value after the amplitude criterion mentioned above is determined to be a single fish. If the second judgment result is negative, the bandwidth and pulse width of the impact response signal are shortened, and the echo signal is pulse-compressed and envelope is calculated using the modified bandwidth 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 impact response signal, until all targets to be tested are identified; the bandwidth of the impact 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 is negative, the target to be tested is determined to be a school of fish.

2. The multi-threaded broadband signal unit identification method according to claim 1, characterized in that, Based on the amplitude criterion, it is determined whether the peak value of the envelope signal conforms to the amplitude range of the target under test, and a first judgment result is obtained, specifically including: Based on the amplitude criterion, sampling points with a window size of np are selected to perform local maximum value search on the envelope signal, and it is determined whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, thus obtaining the first judgment result.

3. The multi-threaded broadband signal unit identification method according to claim 1, characterized in that, The bandwidth and pulse width of the impact response signal are shortened proportionally.

4. The multi-threaded broadband signal unit identification method according to claim 1, characterized in that, The bandwidth of the impulse response signal and the number of times the pulse width of the impulse response signal changes are determined based on the transmission bandwidth and the length of the transmission pulse width of the transducer.

5. A multi-threaded broadband signal unit identification system, characterized in that, include: The pulse compression module is used to perform full-bandwidth pulse compression on the echo signal of the target under test based on the bandwidth and pulse width of the receiver's impulse response signal and to obtain the envelope signal. The echo signal is the signal returned after the transducer transmits a linear frequency modulated signal to the target under test, which is received by the receiver; 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 transmission pulse width of the transducer; The first judgment module is used to determine whether the peak value of the envelope signal conforms to the amplitude range of the target under test based on the amplitude criterion, and to obtain the first judgment result; The peak value determination module after amplitude criterion is used to determine the peak value of the envelope signal that conforms to the amplitude range of the target under test as the peak value after amplitude criterion if the first judgment result is yes. The second judgment module is used to determine whether the peak interval between adjacent peaks after the amplitude criterion is greater than the pulse width of the impact response signal, and to obtain the second judgment result. The single fish determination module is used to determine the target to be measured corresponding to the peak value after the amplitude criterion mentioned above as a single fish if the second judgment result is yes. The bandwidth and pulse modification module is used to shorten the bandwidth and pulse width of the impact response signal if the second judgment result is negative, and to use the modified bandwidth to perform pulse compression on the echo signal and calculate the envelope to obtain the modified envelope signal. The identification module is used to take the modified envelope signal as the envelope signal and the modified pulse width as the pulse width of the impact response signal, until all targets to be tested are identified; the bandwidth of the impact 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. The fish school determination module is used to determine that the target to be tested is a fish school if the first judgment result is negative.

6. The multi-threaded broadband signal unit identification system according to claim 5, characterized in that, The first judgment module specifically includes: The local maximum value search unit is used to select sampling points with a window size of np based on the amplitude criterion to search for local maximum values ​​of the envelope signal, determine whether the peak value of the envelope signal conforms to the amplitude range of the target to be measured, and obtain a first judgment result.

7. The multi-threaded broadband signal unit identification system according to claim 5, characterized in that, The bandwidth of the impact response signal is shortened proportionally to the pulse width of the impact response signal.

8. The multi-threaded broadband signal unit identification system according to claim 5, characterized in that, The bandwidth of the impact response signal and the number of times the pulse width of the impact response signal changes are determined by the transmission bandwidth of the transducer and the length of the transmission pulse width.

9. An electronic device, characterized in that, The device includes a memory and a processor, the memory being used to store a computer program, and the processor running the computer program to cause the electronic device to perform the multi-threaded broadband signal unit identification method as described in any one of claims 1-4.

10. The electronic device according to claim 9, characterized in that, The memory is a non-transitory computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the multi-threaded broadband signal unit identification method as described in any one of claims 1-4.

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