An infrasound detection array in-situ calibration method based on target analog source

Abstract

The application discloses an infrasound detection array in-situ calibration method based on a target simulation source, belongs to the technical field of infrasound detection array calibration, and comprises the following steps: constructing an infrasound detection array in-situ calibration system based on a target simulation source, connecting each infrasound sensor array element in the infrasound detection array with a target simulation source, and communicating the data acquisition system of the infrasound sensor, the simulation source controller of the target simulation source and the infrasound monitoring system data center through a wireless communication device; the simulation source controller realizes time synchronization through Beidou timing, simulates the time delay of the target sound print received by the infrasound sensor array element at different positions by controlling the signal delay of the target simulation source, calculates the positioning result of the target sound source according to the feedback data, analyzes the signal characteristics of the target sound source, compares the calculation and analysis result with the set value of the target simulation source, and thus realizes the in-situ calibration of the positioning accuracy of the infrasound detection array and the accuracy of target characteristic identification.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of infrasound detection array calibration, and particularly relates to an infrasound detection array in-situ calibration method based on a target simulation source. BACKGROUND

[0002] Infrasound generally refers to sound waves with a frequency lower than 20 Hz, which widely exists in nature, industrial production, transportation and military activities, such as natural phenomena like earthquakes and volcanic eruptions, large-scale machinery operation, transportation, rocket and missile launching, industrial and nuclear explosion, and supersonic aircraft flight.

[0003] The signal characteristics of infrasound waves are related to the generation mechanism thereof. Different target sound sources have different sound generation mechanisms, and the kinematics and dynamics characteristics of infrasound signals generated by the same target sound source also have great differences. Therefore, by deploying an infrasound sensor array to collect and analyze infrasound wave signals and extract features, the positioning of infrasound sources and the comprehensive identification of fine parameters can be realized. Based on the characteristics of strong penetration and long propagation distance of infrasound waves, the monitoring technology of infrasound source positioning and identification using an infrasound sensor array is widely used in the fields of national defense safety, geological disaster prevention and control and geophysics research, and has obvious technical advantages. Typical applications include:

[0004] (1) As one of the four monitoring technical means (infrasound, underwater sound, radionuclide and earthquake) for fulfilling the verification task of the Comprehensive Nuclear-Test-Ban Treaty, it is used for positioning the nuclear explosion site and estimating the nuclear explosion yield. The International Monitoring System (IMS) planned and constructed by the Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) is the largest infrasound monitoring network in the world;

[0005] (2) It is a mature technical means for tracking and reconnaissance of rocket and missile launching trajectories. The explosion point position can be located by trajectory tracking to evaluate the striking effect;

[0006] (3) It is used for predicting, monitoring, positioning and quantifying natural disasters like earthquakes, volcanoes and mudslides, and studying the activity rules of meteors and auroras;

[0007] (4) It is used for monitoring and locating the leakage points of natural gas and oil pipelines.

[0008] The main components of the infrasound monitoring system include a wind noise reduction pipe, an infrasound sensor array, a data acquisition system, a wireless transmission device, a power supply, a Beidou timing and positioning system, and meteorological instruments. The infrasound monitoring system is generally installed in the wild and is in an unattended state for a long time. In order to ensure the effectiveness and reliability of the monitoring data, avoid missing and false reporting of major events, and urgently need an online monitoring system for the running state, including in-situ calibration of the infrasound sensor and in-situ calibration of the infrasound detection array. The core indicators of the in-situ calibration of the infrasound sensor include the sound pressure sensitivity and the frequency response. The core indicators of the in-situ calibration of the infrasound detection array include the positioning accuracy of the target source and the target characteristic identification performance. SUMMARY

[0009] The purpose of the present application is to provide an in-situ calibration method for an infrasound detection array based on a target simulation source, which solves the problem of in-situ calibration of the positioning accuracy and target characteristic identification of the infrasound detection array.

[0010] The technical solution adopted by the present application is as follows:

[0011] An in-situ calibration method for an infrasound detection array based on a target simulation source, comprising the following steps:

[0012] (1) An in-situ calibration system for an infrasound detection array based on a target simulation source is constructed, each infrasound sensor element in the infrasound detection array of the in-situ calibration system for an infrasound detection array based on a target simulation source is connected with a target simulation source through a three-port electromagnetic valve, and the data acquisition system of the infrasound sensor element and the simulation source controller of the target simulation source are in communication with the data center of the infrasound monitoring system through wireless communication equipment;

[0013] (2) The data center of the infrasound monitoring system sets the position of the target sound source, calculates the signal delay of each infrasound sensor element receiving the target sound source according to the set position of the target sound source and the position of the infrasound sensor element in the infrasound detection array, and distributes the signal delay to each array;

[0014] (3) The data center of the infrasound monitoring system controls the triggering of the in-situ calibration program of the infrasound detection array, the simulation source controller controls the three-port electromagnetic valve to open the air path between the infrasound sensor element and the target simulation source, and the air path between the infrasound sensor element and the atmospheric environment is cut off, entering the calibration state;

[0015] (4) The simulation source controller of the target simulation source performs time synchronization through the Beidou timing, controls the target simulation source to generate a target soundprint signal with a corresponding delay according to the distribution value of the signal delay, each infrasound sensor element receives the target soundprint signal with a corresponding delay, and the response electric signal generated is collected by the data acquisition system and then returned to the data center of the infrasound monitoring system;

[0016] (5) According to the backhaul data, the positioning result of the target sound source is calculated, and the signal characteristics of the target sound source are analyzed, and the calculation and analysis result is compared with the set value of the target simulation source, so that the in-situ calibration of the infrasound detection array positioning accuracy and the target characteristic identification accuracy is realized;

[0017] (6) The data center of the infrasound monitoring system sends an in-situ calibration end instruction, the simulation source controller controls the three-port electromagnetic valve to cut off the gas path between the infrasound sensor array element and the target simulation source, the infrasound sensor array element is connected with the atmosphere, and the normal monitoring state is restored.

[0018] Further, the target simulation source comprises a coupled cavity infrasound source and a simulation source controller.

[0019] Further, the coupled cavity infrasound source is a piston sound generator.

[0020] As described above, due to the adoption of the above technical scheme, the present application has the following beneficial effects:

[0021] 1、In the present application, by controlling the signal delay of the target simulation source connected with different infrasound sensor array elements, the time delay of the target sound source radiated sound signal reaching different positions of the infrasound sensor array elements is simulated, and the in-situ calibration of the positioning accuracy of the infrasound detection array is realized.

[0022] 2、In the present application, the target simulation source selects a coupled cavity infrasound source, which has a flat frequency response in the working frequency range of the infrasound detection array, and can play the target soundprint with different signal characteristics with high fidelity, thereby realizing the in-situ calibration of the target characteristic identification accuracy of the infrasound detection array, and having the advantages of high stability and low cost.

[0023] 3、In the present application, each infrasound sensor array element in the infrasound detection array is connected with a target simulation source through a three-port electromagnetic valve, when the data center of the infrasound monitoring system remotely controls the infrasound detection array to enter the in-situ calibration state, the simulation source controller controls the channel selection of the three-port electromagnetic valve, so that the infrasound sensor array element is connected with the target simulation source and disconnected with the atmosphere, after the in-situ calibration program is completed, the simulation source controller controls the three-port electromagnetic valve to cut off the connection gas path between the infrasound sensor array element and the target simulation source, the infrasound sensor array element is connected with the atmosphere, and the normal monitoring state is restored, so that the in-situ calibration of the positioning accuracy of the infrasound detection array and the target characteristic identification accuracy is realized, and the demand for periodic or on-demand calibration to check the running state of the infrasound detection array is met. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings, wherein:

[0025] Figure 1 The structure schematic diagram of the infrasound detection array in-situ calibration system based on target simulation source in the present application;

[0026] Figure 2 The signal delay schematic diagram of each infrasound sensor array element receiving target sound source in the infrasound detection array in the present application. DETAILED DESCRIPTION

[0027] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will combine the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art without creative labor on the basis of the embodiments in the present application are within the scope of protection of the present application.

[0029] It should be noted that: the numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0030] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the product of the present application is used, which is only a simplified description for the convenience of describing the present application, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0031] In addition, the terms "horizontal", "vertical", and the like do not mean that the components must be absolutely horizontal or vertical, but can be slightly inclined. For example, "horizontal" only means that it is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined.

[0032] In the description of the present application, it should be further pointed out that, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] The accompanying drawings are combined with the description Figure 1 ,

[0034] A method for in-situ calibration of an infrasound detection array based on a target simulation source, comprising the following steps:

[0035] (1) Construct an in-situ calibration system for an infrasound detection array based on a target simulation source, each infrasound sensor element in the infrasound detection array of the in-situ calibration system for the infrasound detection array based on the target simulation source is connected with a target simulation source through a three-port electromagnetic valve, the target simulation source includes a coupled cavity infrasound source and a simulation source controller, the typical structure of the coupled cavity infrasound source is a piston sound generator, the data acquisition system of the infrasound sensor element and the simulation source controller of the target simulation source are in communication with an infrasound monitoring system data center through a wireless communication device;

[0036] (2) The infrasound monitoring system data center sets the position of the target sound source, calculates the signal delay of each infrasound sensor element receiving the target sound source according to the set position of the target sound source and the position of the infrasound sensor element in the infrasound detection array, and distributes it to each array;

[0037] (3) The infrasound monitoring system data center controls the trigger of the in-situ calibration program of the infrasound detection array, the simulation source controller controls the three-port electromagnetic valve to open the air path between the infrasound sensor element and the target simulation source, and the air path between the infrasound sensor element and the atmosphere is cut off, and the calibration state is entered;

[0038] (4) The simulation source controller of the target simulation source synchronizes time through Beidou timing, controls the target simulation source to generate a target soundprint signal with a corresponding delay according to the distribution value of the signal delay, each infrasound sensor element receives the target soundprint signal with a corresponding delay, and the response electric signal generated is collected by the data acquisition system and then returned to the infrasound monitoring system data center;

[0039] (5) According to the backhaul data, the positioning result of the target sound source is calculated and the signal characteristics of the target sound source are analyzed, and the calculation and analysis result is compared with the set value of the target simulation source, so as to realize the in-situ calibration of the inaccuracy of the infrasound detection array and the accuracy of the target characteristic identification;

[0040] (6) The data center of the infrasound monitoring system sends an in-situ calibration end instruction, the simulation source controller controls the three-port electromagnetic valve to cut off the air path between the infrasound sensor array element and the target simulation source, the infrasound sensor array element is connected with the atmospheric environment, and the normal monitoring state is restored.

[0041] In the implementation process of the embodiment, each infrasound sensor array element in the infrasound detection array is connected with a target simulation source through a three-port electromagnetic valve. When the data center of the infrasound monitoring system remotely controls the infrasound detection array to enter the in-situ calibration state, the simulation source controller controls the channel gating of the three-port electromagnetic valve, so that the infrasound sensor array element is connected with the target simulation source and disconnected with the atmospheric environment. After the in-situ calibration program is completed, the simulation source controller controls the three-port electromagnetic valve to cut off the connection air path between the infrasound sensor array element and the target simulation source, the infrasound sensor array element is connected with the atmospheric environment, and the normal monitoring state is restored.

[0042] The target simulation source is a coupling cavity type infrasound source with a piston sound generator structure, which has a flat frequency response in the working frequency range of the infrasound detection array and can be used as a target sound print playing system with different signal characteristics to calibrate the target identification characteristics of the infrasound detection array.

[0043] Specifically, the simulation source controller realizes time synchronization through Beidou timing, accurately controls the signal delay of the target simulation source playing the target sound print, simulates the time delay of the target sound source radiated sound signal reaching the infrasound sensor array element at different positions, and realizes the in-situ calibration of the positioning accuracy of the infrasound monitoring array.

[0044] The accompanying drawings are incorporated in the specification Figure 2 Taking a planar four-element array as an example, the signal delay of each infrasound sensor array element in the infrasound detection array receiving the target sound source is described. When a point sound source transmits in a spherical wave, the following relationship can be obtained:

[0045]

[0046] In the above formula, (x, y, z) is the set position coordinate of the target sound source, (d, 0, 0), (-d, 0, 0), (0, d, 0), (0, -d, 0) are the position coordinates of each sensor array element in the planar four-element array, r1 is the distance between the first sensor array element and the set position of the target sound source, t1 is the time when the target sound source radiated sound signal reaches the first sensor array element, τ 12 , τ 13 , τ 14The time delay of the target sound source radiation sound signal reaching the 2, 3, 4 sensor array and reaching the 1 sensor array respectively, and c is the sound speed.

[0047] Solving each time delay by formula 1:

[0048]

[0049] The above is the embodiment of the present application. The foregoing is each preferred embodiment of the present application, and the preferred embodiments in each preferred embodiment can be arbitrarily superimposed and combined if not obviously self-contradictory or with a certain preferred embodiment as a prerequisite. The embodiment and the specific parameters in the embodiment are only for clearly describing the verification process of the application and are not used to limit the patent protection scope of the application. The patent protection scope of the application is still subject to its claims. Any equivalent structural changes made by using the content of the specification and drawings of the application should also be included in the protection scope of the application.

Claims

1. A method for in-situ calibration of an infrasound detection array based on a target simulated source, characterized in that, Includes the following steps: (1) Construct an in-situ calibration system for an infrasound detection array based on a target simulation source. Each infrasound sensor element in the in-situ calibration system for an infrasound detection array based on a target simulation source is connected to a target simulation source through a three-port solenoid valve. The data acquisition system of the infrasound sensor element and the simulation source controller of the target simulation source communicate with the data center of the infrasound monitoring system through wireless communication equipment. (2) The data center of the infrasound monitoring system sets the location of the target sound source. Based on the set location of the target sound source and the location of the infrasound sensor array elements in the infrasound detection array, it calculates the signal delay of each infrasound sensor array element receiving the target sound source and distributes it to each array. (3) The data center of the infrasound monitoring system controls and triggers the in-situ calibration program of the infrasound detection array. The analog source controller controls the three-port solenoid valve to open the air path between the infrasound sensor array element and the target analog source, and the air path between the infrasound sensor array element and the atmospheric environment is cut off, and the system enters the calibration state. (4) The analog source controllers of each target simulation source synchronize time through Beidou time synchronization. According to the signal delay distribution value, the target simulation source controls the target simulation source to generate the target acoustic text signal with corresponding delay. Each subsonic sensor array element receives the target acoustic text signal with corresponding delay, and the generated response electrical signal is collected by the data acquisition system and then transmitted back to the subsonic monitoring system data center. (5) Calculate the location result of the target sound source based on the returned data and analyze the signal characteristics of the target sound source. Compare the calculation and analysis results with the set value of the target simulated source to achieve in-situ calibration of the positioning accuracy of the infrasound detection array and the accuracy of target characteristic identification. (6) The data center of the infrasound monitoring system issues an in-situ calibration end command. The analog source controller controls the three-port solenoid valve to cut off the air path between the infrasound sensor array element and the target analog source. The infrasound sensor array element is connected to the atmospheric environment and the normal monitoring state is restored.

2. The in-situ calibration method for an infrasound detection array based on a target simulated source according to claim 1, characterized in that, The target simulation source includes a coupled cavity infrasound source and a simulation source controller.

3. The in-situ calibration method for an infrasound detection array based on a target simulated source according to claim 2, characterized in that, The coupled cavity type infrasound source is a piston generator.

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