Adaptive gain control hydrophone data acquisition system and method

Abstract

The invention discloses a self-adaptive gain control hydrophone data acquisition system and method, and relates to the technical field of underwater acoustic signal acquisition, and the system comprises an environment acquisition module, a preliminary analysis module, a signal acquisition module, a dynamic analysis module and a dynamic adjustment module. The preliminary analysis module is used for analyzing the current underwater environment data, calculating basic gain data according to the underwater environment data, and taking the gain data as basic gain; the method is technically characterized in that high-quality underwater sound data can be acquired under different signal intensities through adaptive gain control; the gain can be automatically adjusted according to different underwater environments and signal intensities, so that the flexibility and adaptability of the system are improved; and the adaptive gain control reduces the demand of manual gain adjustment, reduces the operation complexity and the labor cost, and has a good use prospect.

Description

Technical Field

[0001] The invention relates to the technical field of underwater acoustic signal acquisition, and in particular to a hydrophone data acquisition system and method with adaptive gain control. Background Art

[0002] The basic contents of marine acoustics include three aspects: the propagation laws of sound in the ocean and the influence of ocean conditions on sound propagation, mainly including the propagation laws of sound waves under different hydrological and geological conditions, the influence of the seabed on sound wave propagation, the absorption of sound by seawater, the fluctuations of sound waves, scattering and ocean noise; using sound waves to detect the ocean, which can not only measure the depth of the ocean, but also discover oil hidden on the seabed; marine acoustic technology and instruments, various types of sonar equipment are the best in marine acoustic technology.

[0003] A hydrophone is a transducer that converts acoustic signals into electrical signals. It is used to receive acoustic signals in water and is called a receiving transducer. Hydrophones are widely used in underwater communications, detection, target positioning, tracking, etc. and are an important component of sonar.

[0004] The existing application publication number is CN117856908A, and its name is a hydrophone data acquisition and transmission system based on optical fiber communication, which includes a seabed monitoring hydrophone array, an acquisition and transmission node, an optical fiber communication system, and a shipboard monitoring terminal. The acquisition and transmission node is used for signal conditioning, acquisition, and transmission of hydroacoustic signals; after the optical fiber communication system receives the data transmitted by the acquisition and transmission node, it converts the electrical signal into an optical signal, and transmits the optical signal to the shipboard monitoring terminal by optical fiber; the shipboard monitoring terminal receives the optical signal transmitted by the optical fiber communication system, converts the optical signal into an electrical signal, and monitors and detects the underwater environment. The present invention adopts the above-mentioned hydrophone data acquisition and transmission system based on optical fiber communication, which effectively improves the accuracy and stability of the transmission signal, while reducing the influence of background noise, and can perform large-scale and all-round monitoring of the seabed environment, further improving the effectiveness and reliability of the collected data.

[0005] However, according to the above contents and in combination with the prior art, the core solution of the solution described in the above patent is to construct a solution for hydrophone data collection and transmission.

[0006] However, the above scheme has great defects in actual use. During the process of underwater acoustic signal collection, due to the complexity of the underwater environment and the change of signal strength, a signal that is too weak may lead to inaccurate data collection, and a signal that is too strong may cause data distortion. The existing fixed gain setting often cannot meet the data collection needs in various situations. Some schemes that adjust the gain are used, but the gain is set according to the depth of the ocean and then maintained. This method is only applicable to areas with unchanging marine environment and does not meet people's usage requirements. For this reason, we have developed a hydrophone data acquisition system and method with adaptive gain control. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies in the prior art, the present invention provides a hydrophone data acquisition system and method with adaptive gain control. Through adaptive gain control, it can ensure that high-quality hydrophone data can be collected under different signal strengths; and the gain can be automatically adjusted according to different underwater environments and signal strengths, thereby improving the flexibility and adaptability of the system; and the adaptive gain control reduces the need for manual gain adjustment, reduces operational complexity and labor costs, and has good prospects for use.

[0009] (II) Technical solution

[0010] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0011] The hydrophone data acquisition system with adaptive gain control includes an environment acquisition module, a preliminary analysis module, a signal acquisition module, a dynamic analysis module and a dynamic adjustment module:

[0012] The environment acquisition module is used to collect current underwater environment data;

[0013] The preliminary analysis module is used to analyze the current underwater environment data, calculate the basic gain data according to the underwater environment data, and use the gain data as the basic gain;

[0014] The signal acquisition module is used to collect acoustic signal data of the current position for a period of time, convert the acoustic signal into an electrical signal, and perform basic gain on the converted electrical signal;

[0015] The dynamic analysis module is used to analyze the electrical signal data after basic gain, obtain the power spectrum density Glp of the electrical signal data in this time period and the instantaneous amplitude Fd of the electrical signal, and judge whether the data collection requirements are met according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. If the data collection requirements are not met, new gain data is calculated according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal;

[0016] The dynamic adjustment module sets the calculated new gain data as the gain of the current hydrophone.

[0017] The present invention records a hydrophone data acquisition system with adaptive gain control. Through adaptive gain control, it can ensure that high-quality hydrophone data can be collected under different signal strengths; and the gain can be automatically adjusted according to different underwater environments and signal strengths, thereby improving the flexibility and adaptability of the system; and the adaptive gain control reduces the need for manual gain adjustment, reduces operational complexity and labor costs, and has good prospects for use.

[0018] Preferably, the underwater environment data includes the depth, water flow velocity and temperature of the location.

[0019] Preferably, the calculation formula for calculating the basic gain data based on the underwater environment data is as follows:

[0020]

[0021] Wherein, Zy is the basic gain data calculated according to the underwater environment data, ROUND(x, 2) is rounded to two decimal places, H is the depth of the location, α is the influence coefficient of depth on gain, A is a constant coefficient, A>1, Ls is the water flow data, β is the influence coefficient of water flow velocity on gain, Wd is the temperature, γ is the influence coefficient of temperature on gain, 1>α>β>γ>0.

[0022] Preferably, when judging whether the data collection requirement is met based on the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal, the instantaneous amplitude Fd of the electrical signal and the power spectrum density Glp are compared with a preset standard interval;

[0023] The preset standard intervals include the instantaneous amplitude standard interval [Fd min , Fd max ] and the power spectrum density standard interval [Glp min , Glp max ];

[0024] When the power spectrum density Glp is within the standard power spectrum density interval [Glp min , Glp max ], and the instantaneous amplitude Fd of the electrical signal is within the instantaneous amplitude standard interval [Fd min , Fd max ] to meet data collection needs.

[0025] Preferably, the new gain data is calculated according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal, and the new gain data is calculated according to the instantaneous amplitude Fd of the electrical signal and the critical threshold data of the standard interval. The specific calculation formula is as follows:

[0026]

[0027] Wherein, Zy′ is the new gain data calculated according to the instantaneous amplitude Fd of the electrical signal and the critical threshold data of the standard interval.

[0028] Preferably, the dynamic adjustment module also obtains all new gain data calculated by the dynamic analysis module at the current position and the current environment, removes the maximum and minimum values ​​of the new gain data, and calculates the average gain based on the remaining new gain data. And use average gain when there is no obvious change in the environment As a gain;

[0029] Average gain The calculation formula is as follows:

[0030]

[0031] Where Zy′ i is the i-th group of gain data, n is the number of gain data calculated by the dynamic analysis module, n>10;

[0032] When there is no obvious change in the environment, determine whether the new gain data calculated by the dynamic analysis module meets the standard range. The specific calculation formula is as follows:

[0033]

[0034] Where Bhfd is the change amplitude of the new gain data, Zy′ max Zy′ is the maximum value of the remaining gain data after removing the maximum value in the new gain data. min It is the minimum value of the remaining gain data after removing the maximum and minimum values ​​in the new gain data. When Bhfd<8%, it is determined that there is no obvious change in the environment.

[0035] Preferably, it also includes an audit correction module, which obtains the basic gain data Zy and the average gain calculated according to the underwater environment data. And calculate the difference ratio, and judge whether the basic gain data Zy is standard according to the difference ratio. If it is not standard, adjust the influence coefficient α of depth on gain, the influence coefficient β of water flow velocity on gain and the influence coefficient γ of temperature on gain.

[0036] Preferably, the gain data Zy and the average gain are calculated The formula for the difference ratio is as follows:

[0037]

[0038] Where Czbl is the gain data Zy and the average gain The difference ratio of

[0039] When judging whether the basic gain data Zy is standard according to the difference ratio, it is judged whether the difference ratio Czbl is within the set difference interval (-p, p), 3%≤p≤5%;

[0040] When the difference ratio is within the set difference interval (-p, p), the basic gain data Zy standard does not need to be adjusted;

[0041] When the difference ratio is outside the set difference interval (-p, p), the influence coefficient α of the depth on the gain, the influence coefficient β of the water velocity on the gain, and the influence coefficient γ of the temperature on the gain are adjusted.

[0042] Preferably, when adjusting the influence coefficient α of depth on gain, the influence coefficient β of water velocity on gain and the influence coefficient γ of temperature on gain, first determine whether Czbl is greater than 0, and when Czbl is greater than 0, adjust α, β and γ upward, and when Czbl<0, adjust α, β and γ downward;

[0043] The amplitude of each increase or decrease is θ, θ<1%. After adjustment, the basic gain data Zy1 is recalculated, and the gain data Zy1 and the average gain are calculated. The difference ratio Czbl1 is used to determine whether Czbl1 is within the set stop adjustment interval. Inside;

[0044] When Czbl1 is in the stop adjustment range If Czbl1 is within the stop adjustment interval, stop adjusting. When the value is outside, continue to adjust until the Czbl obtained after k adjustments is k Located in the set stop adjustment range In this case, α k , β k and γ k As a preliminary analysis module, the influence coefficient of depth on gain, the influence coefficient of water velocity on gain and the influence coefficient of temperature on gain of the basic gain are subsequently calculated.

[0045] Preferably, the method for collecting hydrophone data with adaptive gain control comprises the following steps:

[0046] Collect current underwater environment data;

[0047] Analyze the current underwater environment data, calculate basic gain data according to the underwater environment data, and use the gain data as the basic gain;

[0048] Collect acoustic signal data of the current position for a period of time, convert the acoustic signal into an electrical signal, and perform basic gain on the converted electrical signal;

[0049] Analyze the electrical signal data after basic gain, obtain the power spectrum density Glp of the electrical signal data in this time period and the instantaneous amplitude Fd of the electrical signal, and judge whether the data collection requirements are met according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. If the data collection requirements are not met, calculate the new gain data according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal;

[0050] The calculated new gain data is set as the gain of the current hydrophone.

[0051] (III) Beneficial effects

[0052] The present invention provides a hydrophone data acquisition system and method with adaptive gain control, which has the following beneficial effects:

[0053] 1. The present invention records a hydrophone data acquisition system with adaptive gain control. Through adaptive gain control, it can ensure that high-quality hydrophone data can be collected under different signal strengths; and the gain can be automatically adjusted according to different underwater environments and signal strengths, thereby improving the flexibility and adaptability of the system; and the adaptive gain control reduces the need for manual gain adjustment, reduces operational complexity and labor costs, and has good prospects for use.

[0054] 2. The present invention records an adaptive gain-controlled hydrophone data acquisition system, which uses the underwater environment as the basic gain, and further collects real-time data, further analyzes it, obtains more accurate gain data, and uses the gain for dynamic adjustment, and further analyzes it to obtain the average gain, and maintains the gain when the underwater environment does not change much, which can reduce the gain fluctuation, reduce the amount of data calculation, and does not require long-term high-frequency calculation of related computing equipment, and has a good use effect.

[0055] 3. The present invention records a hydrophone data acquisition system with adaptive gain control, which analyzes the dynamic gain to obtain the average gain, and compares the average gain with the basic gain, and adjusts the influence coefficient of the basic gain, so that the calculation of the basic gain is more accurate, so that the difference in gain adjustment is smaller during use, it is more convenient to use, the use effect is better, and it has a good prospect for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 A structural block diagram of a hydrophone data acquisition system with adaptive gain control according to the present invention;

[0057] Figure 2A flow chart of a hydrophone data acquisition system with adaptive gain control according to the present invention;

[0058] Figure 3 The present invention is a flow chart of the hydrophone data acquisition method with adaptive gain control. DETAILED DESCRIPTION

[0059] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] Reasons for research

[0061] The hydrophone data acquisition system with adaptive gain control of the present invention is mainly aimed at the existing system in the process of collecting underwater acoustic signals. Due to the complexity of the underwater environment and the change of signal strength (when close to the water surface, it is affected by the wind force at sea and the movement of water flow, causing relatively large interference, and when bad weather occurs, the weather factor is very large, and the fixed gain method cannot realize the collection of underwater acoustic signals. When the water depth is greater than 50 meters and there is no bad weather, the fixed gain method can be used at this time. At that time, the water depth is different and the interference from the outside world is different, so the fixed gain needs additional calculation). Too weak signals may cause inaccurate data collection, and too strong signals may cause data distortion. The existing fixed gain setting often cannot meet the data collection requirements in various situations. Some solutions adopt the gain adjustment scheme, but the gain is set according to the depth of the ocean and then the gain is maintained. This method is only applicable to areas where the marine environment remains unchanged and does not meet people's use requirements.

[0062] Design ideas

[0063] Most existing systems have a gain adjustment function, but during use, the gain is usually set in advance and the fixed gain is kept unchanged during use, resulting in poor collected underwater acoustic signal data and troublesome subsequent analysis.

[0064] Therefore, during the research and development process, the initial idea was to study the factors of gain, establish more standard influencing factors and influencing coefficients, and through a large amount of data calculation and analysis, screen out the main influencing factors and influencing proportions that meet the gain calculation, and calculate the corresponding influencing coefficients of the influencing factors. Through the analysis of this data, the gain can be calculated clearly and more accurately.

[0065] However, in actual use, it was found that most of the hydroacoustic data were collected close to the water surface, and were greatly disturbed by the external environment (mainly because the wind was strong on the sea surface, causing the environment around the hydroacoustic device to be in a fluctuating state. In this state, the results obtained by using a fixed gain method were inaccurate), which did not meet people's usage requirements.

[0066] Therefore, in the middle of the research and development, we changed our thinking and started from the real-time detected data. We directly processed the collected data to determine whether the gain setting was standard. When the gain did not meet the standard, we calculated the required gain amplitude, and then calculated the new gain. And directly applied the gain, in this case, the gain setting was more accurate and the effect was very good.

[0067] However, in actual use, it is found that due to the influence of the external environment, dynamic gain is more suitable for scenarios where the environment changes. When the environment basically does not change, if the basic gain used is not standard, manual adjustment is usually performed, but the specific adjustment amount is unclear, and repeated trial and error is required, which is more troublesome.

[0068] Therefore, in the later stage of research and development, we fully combined the previous plans and formulated a dynamic adjustment plan and a basic gain adjustment plan. This plan can effectively reduce the number of subsequent dynamic adjustments and can automatically adjust the gain without manual adjustment by staff. It is convenient to use, has good results, and has good prospects for use.

[0069] Study plan

[0070] The data acquisition source of the hydrophone data acquisition system with adaptive gain control of the present invention is the same as that of the prior art, and the current water depth data and water flow velocity are additionally detected by corresponding sensors on the hydrophone, thereby acquiring corresponding environmental data.

[0071] like Figure 1-2 As shown, the hydrophone data acquisition system with adaptive gain control includes an environment acquisition module, a preliminary analysis module, a signal acquisition module, a dynamic analysis module and a dynamic adjustment module:

[0072] Data acquisition:

[0073] All systems, when in use, are analyzed and calculated through data, and they are inseparable from data. Therefore, accurate data collection is required, and accurate data collection is based on the environmental collection module.

[0074] The environment acquisition module is used to collect the current underwater environment data.

[0075] Underwater environmental data includes the depth, water velocity and temperature of the location.

[0076] Under the growing ocean, the water surface isolates some external interference. Except for special environments, it is generally sufficient to collect depth, water flow velocity and temperature. When the hydroacoustic signal fluctuates too much in bad weather, the collected data is inaccurate. Generally, the gain is not adjusted and the hydroacoustic data is collected according to the basic gain.

[0077] The present invention records a hydrophone data acquisition system with adaptive gain control. Through adaptive gain control, it can ensure that high-quality hydrophone data can be collected under different signal strengths; and the gain can be automatically adjusted according to different underwater environments and signal strengths, thereby improving the flexibility and adaptability of the system; and the adaptive gain control reduces the need for manual gain adjustment, reduces operational complexity and labor costs, and has good prospects for use.

[0078] Preliminary data analysis:

[0079] After the data is collected, it is necessary to further analyze and calculate the collected data, and obtain the desired data after judgment. This step is based on the preliminary analysis module.

[0080] The preliminary analysis module is used to analyze the current underwater environment data, calculate the basic gain data according to the underwater environment data, and use the gain data as the basic gain;

[0081] The calculation formula for calculating the basic gain data based on the underwater environment data is as follows:

[0082]

[0083] Wherein, Zy is the basic gain data calculated according to the underwater environment data, ROUND(x, 2) is rounded to two decimal places, H is the depth of the location, α is the influence coefficient of depth on gain, A is a constant coefficient, A>1, Ls is the water flow data, β is the influence coefficient of water flow velocity on gain, Wd is the temperature, γ is the influence coefficient of temperature on gain, 1>α>β>γ>0.

[0084] The calculation in this step is the basic gain calculated when the hydrophone is directly placed at the detection position. When the normal environment does not change, this gain can be used.

[0085] Gain Application:

[0086] After the basic gain is calculated, it is not clear whether the gain is effective. Therefore, the calculated gain must be further analyzed and calculated, and this step is based on the signal acquisition module.

[0087] The signal acquisition module is used to collect acoustic signal data of the current position for a period of time, convert the acoustic signal into an electrical signal, and perform basic gain on the converted electrical signal;

[0088] This step is the normal use step of a normal hydrophone.

[0089] Secondary analysis:

[0090] After the gain data is applied, further analysis and calculation of the gain data is required to determine whether the basic gain meets the requirements, so a dynamic analysis module is required.

[0091] The dynamic analysis module is used to analyze the electrical signal data after basic gain, obtain the power spectrum density Glp of the electrical signal data in this time period and the instantaneous amplitude Fd of the electrical signal, and judge whether the data collection requirements are met according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. If the data collection requirements are not met, new gain data is calculated according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal;

[0092] When judging whether the data acquisition requirements are met based on the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal, the instantaneous amplitude Fd and the power spectrum density Glp of the electrical signal are compared with the preset standard interval;

[0093] The preset standard intervals include the instantaneous amplitude standard interval [Fd min , Fd max ] and the power spectrum density standard interval [Glp min , Glp max ];

[0094] When the power spectrum density Glp is within the standard power spectrum density interval [Glp min , Glp max ], and the instantaneous amplitude Fd of the electrical signal is within the instantaneous amplitude standard interval [Fd min , Fd max ] to meet data collection needs.

[0095] This step is mainly to verify whether the effect of the basic gain can meet the data collection requirements. If there is no obvious change in the environment and the calculation result meets the data collection requirements, the gain can be used directly for calculation, and the use effect is good.

[0096] However, there may be environmental changes (windy and high-wind weather, which cause obvious changes in water flow data and affect the changes in the hydroacoustic signal), and new gains are calculated at this time.

[0097] The new gain data is calculated based on the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. The new gain data is calculated based on the instantaneous amplitude Fd of the electrical signal and the critical threshold data of the standard interval. The specific calculation formula is as follows:

[0098]

[0099] Wherein, Zy′ is the new gain data calculated according to the instantaneous amplitude Fd of the electrical signal and the critical threshold data of the standard interval.

[0100] This step mainly performs real-time calculation and real-time adjustment. It is mainly used in scenarios with changing environments and when the initial calculated basic gain is not standard. In this case, new gain data that meets the standard is calculated.

[0101] Gain Adjustment:

[0102] When the new gain is calculated, the gain data is directly applied at this time. This step is based on the dynamic adjustment module.

[0103] The dynamic adjustment module sets the calculated new gain data as the gain of the current hydrophone.

[0104] This situation mainly regulates the constantly changing environment on the water.

[0105] When the environment has no obvious changes, but the basic gain data is not standard, the dynamic adjustment module also obtains all the new gain data calculated by the dynamic analysis module at the current position and current environment, removes the maximum and minimum values ​​of the new gain data, and calculates the average gain based on the remaining new gain data. And use average gain when there is no obvious change in the environment As a gain;

[0106] Average gain The calculation formula is as follows:

[0107]

[0108] Where Zy′ i is the i-th group of gain data, n is the number of gain data calculated by the dynamic analysis module, n>10;

[0109] If there is too little data, the result will be inaccurate and not representative. Therefore, a certain number of data must be present, so n>10. At this time, the amount of data is sufficient, the result is relatively accurate, and the amount of data calculation is not large.

[0110] The more n there are, the more accurate the calculated result will be. Therefore, the data of n is set according to the needs.

[0111] When there is no obvious change in the environment, determine whether the new gain data calculated by the dynamic analysis module meets the standard range. The specific calculation formula is as follows:

[0112]

[0113] Where Bhfd is the change amplitude of the new gain data, Zy′ max Zy′ is the maximum value of the remaining gain data after removing the maximum value in the new gain data. min It is the minimum value of the remaining gain data after removing the maximum and minimum values ​​in the new gain data. When Bhfd<8%, it is considered that there is no significant change in the environment. The greater the environmental change, the greater the Zy′ max -Zy′ min The larger the difference is, the larger the calculated Bhfd is. Therefore, it is possible to directly judge whether the new gain data meets the requirements by the size of Bhfd.

[0114] It also includes an audit correction module, which obtains the basic gain data Zy and average gain calculated based on the underwater environment data. And calculate the difference ratio, and judge whether the basic gain data Zy is standard according to the difference ratio. If it is not standard, adjust the influence coefficient α of depth on gain, the influence coefficient β of water flow velocity on gain and the influence coefficient γ of temperature on gain.

[0115] Calculate the gain data Zy and the average gain The formula for the difference ratio is as follows:

[0116]

[0117] Where Czbl is the gain data Zy and the average gain The difference ratio of

[0118] When judging whether the basic gain data Zy is standard according to the difference ratio, it is judged whether the difference ratio Czbl is within the set difference interval (-p, p), 3%≤p≤5%;

[0119] When the difference ratio is within the set difference interval (-p, p), the basic gain data Zy standard does not need to be adjusted;

[0120] When the difference ratio is outside the set difference interval (-p, p), the influence coefficient α of the depth on the gain, the influence coefficient β of the water velocity on the gain, and the influence coefficient γ of the temperature on the gain are adjusted.

[0121] The present invention records a hydrophone data acquisition system with adaptive gain control, which uses the underwater environment as the basic gain, and further collects real-time data, further analyzes it, obtains more accurate gain data, and uses the gain for dynamic adjustment, and further analyzes it to obtain the average gain, and maintains the gain when the underwater environment does not change much, which can reduce the gain fluctuation, reduce the amount of data calculation, and does not require long-term high-frequency calculation of related computing equipment, and has a good use effect.

[0122] p is usually taken as 4%.

[0123] With the increase of the number of uses, the increase of the number of adjustments of the influence coefficient α of depth on gain, the influence coefficient β of water flow velocity on gain and the influence coefficient γ of temperature on gain, the obtained influence coefficient α of depth on gain, the influence coefficient β of water flow velocity on gain and the influence coefficient γ of temperature on gain become more and more accurate, and the calculated basic gain becomes more and more accurate at this time.

[0124] When adjusting the influence coefficient α of depth on gain, the influence coefficient β of water velocity on gain and the influence coefficient γ of temperature on gain, first determine whether Czbl is greater than 0. When Czbl is greater than 0, increase α, β and γ. When Czbl < 0, decrease α, β and γ.

[0125] The amplitude of each increase or decrease is θ, θ<1%. After adjustment, the basic gain data Zy1 is recalculated, and the gain data Zy1 and the average gain are calculated. The difference ratio Czbl1 is used to determine whether Czbl1 is within the set stop adjustment interval. Inside;

[0126] When Czbl1 is in the stop adjustment range If Czbl1 is within the stop adjustment interval, stop adjusting. When the value is outside, continue to adjust until the Czbl obtained after k adjustments is k Located in the set stop adjustment range In this case, α k , β k and γ k As a preliminary analysis module, the influence coefficient of depth on gain, the influence coefficient of water velocity on gain and the influence coefficient of temperature on gain of the basic gain are subsequently calculated.

[0127] k is the number of adjustments, α k , β k and γ k That is, the influence coefficient of depth on gain, the influence coefficient of water velocity on gain and the influence coefficient of temperature on gain obtained after adjustment k times.

[0128] Usually it is 2, and θ is usually adjusted by 0.5% each time. Fine-tuning is performed each time so that the result gets closer and closer to (-2, 2) until it is within (-2, 2), which has a good effect.

[0129] The present invention records a hydrophone data acquisition system with adaptive gain control, which analyzes the dynamic gain to obtain the average gain, compares the average gain with the basic gain, and adjusts the influence coefficient of the basic gain, so that the calculation of the basic gain is more accurate, so that the difference in gain adjustment is smaller during use, the use is more convenient, the use effect is better, and it has a good use prospect.

[0130] like Figure 3 As shown, the method for collecting hydrophone data with adaptive gain control comprises the following steps:

[0131] Collect current underwater environment data;

[0132] Analyze the current underwater environment data, calculate basic gain data according to the underwater environment data, and use the gain data as the basic gain;

[0133] Collect acoustic signal data of the current position for a period of time, convert the acoustic signal into an electrical signal, and perform basic gain on the converted electrical signal;

[0134] Analyze the electrical signal data after basic gain, obtain the power spectrum density Glp of the electrical signal data in this time period and the instantaneous amplitude Fd of the electrical signal, and judge whether the data collection requirements are met according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. If the data collection requirements are not met, calculate the new gain data according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal;

[0135] The calculated new gain data is set as the gain of the current hydrophone;

[0136] When the environment has no obvious changes, but the basic gain data is not standard, the dynamic adjustment module also obtains all the new gain data calculated by the dynamic analysis module at the current position and the current environment, removes the maximum and minimum values ​​of the new gain data, and calculates the average gain Zy′ based on the remaining new gain data, and uses the average gain Zy′ as the gain when the environment has no obvious changes;

[0137] Obtain the basic gain data Zy and the average gain Zy′ calculated according to the underwater environment data, calculate the difference ratio, and judge whether the basic gain data Zy is standard according to the difference ratio. If it is not standard, adjust the influence coefficient α of the depth on the gain, the influence coefficient β of the water flow velocity on the gain, and the influence coefficient γ of the temperature on the gain.

[0138] The above formula is a formula obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0139] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

[0140] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, and may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0141] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A hydrophone data acquisition system with adaptive gain control, characterized in that: include: Environmental collection module, used to collect current underwater environmental data; The preliminary analysis module is used to analyze the current underwater environment data, calculate the basic gain data according to the underwater environment data, and use the gain data as the basic gain; The signal acquisition module is used to collect acoustic signal data of the current position for a period of time, convert the acoustic signal into an electrical signal, and perform basic gain on the converted electrical signal; The dynamic analysis module is used to analyze the electrical signal data after basic gain, obtain the power spectrum density Glp of the electrical signal data in the time period and the instantaneous amplitude Fd of the electrical signal, and judge whether the data collection requirements are met according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. If the data collection requirements are not met, the new gain data is calculated according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal; The dynamic adjustment module sets the calculated new gain data as the gain of the current hydrophone.

2. The hydrophone data acquisition system with adaptive gain control according to claim 1, characterized in that: The underwater environment data includes the depth, water flow speed and temperature of the location.

3. The hydrophone data acquisition system with adaptive gain control according to claim 2, characterized in that: The calculation formula for calculating the basic gain data based on the underwater environment data is as follows: Wherein, Zy is the basic gain data calculated according to the underwater environment data, ROUND(x, 2) is rounded to two decimal places, H is the depth of the location, α is the influence coefficient of depth on gain, A is a constant coefficient, A>1, Ls is the water flow data, β is the influence coefficient of water flow velocity on gain, Wd is the temperature, γ is the influence coefficient of temperature on gain, 1>α>β>γ>0.

4. The hydrophone data acquisition system with adaptive gain control according to claim 3, characterized in that: When judging whether the data acquisition requirements are met based on the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal, the instantaneous amplitude Fd and the power spectrum density Glp of the electrical signal are compared with the preset standard interval; The preset standard intervals include the instantaneous amplitude standard interval [Fd min , Fd max ] and the power spectrum density standard interval [Glp min , Glp max ]; When the power spectrum density Glp is within the standard power spectrum density interval [Glp min , Glp max ], and the instantaneous amplitude Fd of the electrical signal is within the instantaneous amplitude standard interval [Fd min , Fd max ] to meet data collection needs.

5. The hydrophone data acquisition system with adaptive gain control according to claim 4, characterized in that: The new gain data is calculated based on the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. The new gain data is calculated based on the instantaneous amplitude Fd of the electrical signal and the critical threshold data of the standard interval. The specific calculation formula is as follows: Wherein, Zy′ is the new gain data calculated according to the instantaneous amplitude Fd of the electrical signal and the critical threshold data of the standard interval.

6. The hydrophone data acquisition system with adaptive gain control according to claim 5, characterized in that: The dynamic adjustment module also obtains all the new gain data calculated by the dynamic analysis module at the current position and current environment, removes the maximum and minimum values ​​of the new gain data, and calculates the average gain based on the remaining new gain data. And use average gain when there is no obvious change in the environment As a gain; Average gain The calculation formula is as follows: Where Zy′ i is the i-th group of gain data, n is the number of gain data calculated by the dynamic analysis module, n>10; When there is no obvious change in the environment, determine whether the new gain data calculated by the dynamic analysis module meets the standard range. The specific calculation formula is as follows: Where Bhfd is the change amplitude of the new gain data, Zy′ max Zy′ is the maximum value of the remaining gain data after removing the maximum value in the new gain data. min It is the minimum value of the remaining gain data after removing the maximum and minimum values ​​in the new gain data. When Bhfd<8%, it is determined that there is no obvious change in the environment.

7. The hydrophone data acquisition system with adaptive gain control according to claim 6, characterized in that: It also includes an audit correction module, which obtains the basic gain data Zy and average gain calculated based on the underwater environment data. And calculate the difference ratio, and judge whether the basic gain data Zy is standard according to the difference ratio. If it is not standard, adjust the influence coefficient α of depth on gain, the influence coefficient β of water flow velocity on gain and the influence coefficient γ of temperature on gain.

8. The hydrophone data acquisition system with adaptive gain control according to claim 7, characterized in that: Calculate the gain data Zy and the average gain The formula for the difference ratio is as follows: Where Czbl is the gain data Zy and the average gain The difference ratio of When judging whether the basic gain data Zy is standard according to the difference ratio, it is judged whether the difference ratio Czbl is within the set difference interval (-p, p), 3%≤p≤5%; When the difference ratio is within the set difference interval (-p, p), the basic gain data Zy standard does not need to be adjusted; When the difference ratio is outside the set difference interval (-p, p), the influence coefficient α of the depth on the gain, the influence coefficient β of the water velocity on the gain, and the influence coefficient γ of the temperature on the gain are adjusted.

9. The hydrophone data acquisition system with adaptive gain control according to claim 8, characterized in that: When adjusting the influence coefficient α of depth on gain, the influence coefficient β of water velocity on gain and the influence coefficient γ of temperature on gain, first determine whether Czbl is greater than 0. When Czbl is greater than 0, adjust α, β and γ upwards; when Czbl<0, adjust α, β and γ downwards. The amplitude of each increase or decrease is θ, θ<1%. After adjustment, the basic gain data Zy1 is recalculated, and the gain data Zy1 and the average gain are calculated. The difference ratio Czbl1 is used to determine whether Czbl1 is within the set stop adjustment interval. Inside; When Czbl1 is in the stop adjustment range If Czbl1 is within the stop adjustment interval, stop adjusting. When the value is outside, continue to adjust until the Czbl obtained after k adjustments is k Located in the set stop adjustment range In this case, α k , β k and γ k As a preliminary analysis module, the influence coefficient of depth on gain, the influence coefficient of water velocity on gain and the influence coefficient of temperature on gain of the basic gain are subsequently calculated.

10. A method for collecting hydrophone data with adaptive gain control, using the system according to any one of claims 1 to 9, characterized in that: The steps include: Collect current underwater environment data; Analyze the current underwater environment data, calculate basic gain data according to the underwater environment data, and use the gain data as the basic gain; Collect acoustic signal data of the current position for a period of time, convert the acoustic signal into an electrical signal, and perform basic gain on the converted electrical signal; Analyze the electrical signal data after basic gain, obtain the power spectrum density Glp of the electrical signal data in this time period and the instantaneous amplitude Fd of the electrical signal, and judge whether the data collection requirements are met according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal. If the data collection requirements are not met, calculate the new gain data according to the power spectrum density Glp and the instantaneous amplitude Fd of the electrical signal; The calculated new gain data is set as the gain of the current hydrophone.

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