Simulation system for detecting sound scattering characteristics of underwater target by multi-base sonar

Abstract

The invention discloses a multi-base sonar detection underwater target sound scattering characteristic simulation system comprising a simulator group which comprises a plurality of simulators and is used for simulating underwater target sound scattering characteristics; the plurality of transducers are used for transmitting sound sources to the simulator group and receiving the sound sources; and the system control module is used for performing operation control and state data analysis on the simulator group and the transducer. The model of the underwater target is divided into a plurality of sub-regions, and the system control module constructs impulse response functions of the sub-regions by adopting a multi-base applicable plate element method, generates echo analog signals and transmits the echo analog signals to the analog transmitting transducers of the simulator group.

Description

Technical Field

[0001] The invention belongs to the technical field of underwater acoustic simulation, and in particular relates to a multi-base sonar detection underwater target acoustic scattering characteristic simulation system. Background Art

[0002] With the development of underwater acoustic countermeasure technology, traditional single-base sonar faces increasingly severe challenges. Its effective range is significantly shortened, its concealment performance is greatly reduced, and its application efficiency is seriously affected. Compared with single-base sonar, multi-base active sonar has the advantages of good concealment, long effective range, and strong anti-interference ability due to its unique design of separating the transmitting sound source and the receiver, forming a geometric triangle layout with the target. These characteristics make multi-base sonar an important trend in the development of active sonar technology. Summary of the invention

[0003] One of the embodiments of the present disclosure is a system for simulating acoustic scattering characteristics of underwater targets for multi-base sonar detection, comprising:

[0004] A simulator group, including multiple simulators, for simulating the acoustic scattering characteristics of underwater targets;

[0005] a plurality of transducers for transmitting sound sources and receiving sound sources to the simulator group;

[0006] The system control module is used for the operation control and status data analysis of the simulator group and the transducer.

[0007] The model of the underwater target is divided into multiple sub-areas, and the system control module uses a plate element method applicable to multiple bases to construct an impulse response function of the sub-area, generate an echo simulation signal, and transmit it to the simulated transmitting transducer of the simulator group. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The above and other objects, features and advantages of the exemplary embodiments of the present invention will become readily understood by reading the detailed description below with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present invention are shown in an exemplary and non-limiting manner, in which:

[0009] Figure 1 A block diagram of a target acoustic scattering waveform simulation system for multi-base sonar detection according to one embodiment of the present invention.

[0010] Figure 2 A schematic diagram of the composition of a simulation system according to one embodiment of the present invention.

[0011] Figure 3 A schematic diagram of a simulator group structure according to one embodiment of the present invention, wherein:

[0012] Figure 3-a is a single simulator, Figure 3 -b is for multiple simulator groups.

[0013] Figure 4 A schematic diagram of the relative position of an underwater target and multi-base sonar according to one embodiment of the present invention.

[0014] Figure 5 Schematic diagram of bright spot distribution results (2kHz) of an underwater target sub-region according to one embodiment of the present invention.

[0015] in, Figure 5 -a is 45° incidence, Figure 5 -b is 90° incidence.

[0016] Figure 6 Schematic diagram of underwater target simulation signal received by a multi-base sonar according to one embodiment of the present invention.

[0017] Figure 7 Schematic diagram of original signals of underwater targets received by a multi-base sonar according to one embodiment of the present invention. DETAILED DESCRIPTION

[0018] As a key device for evaluating the detection performance of multi-base active sonar systems, underwater target acoustic scattering characteristics simulators have the advantages of small size, low cost, and easy to deploy and retract. At present, there are many types of underwater target simulators, such as buoy-type, towed-type, and self-propelled-type, which can simulate the acoustic scattering characteristics of underwater maneuvering targets. However, these simulators are mainly for single-base sonar systems and cannot accurately simulate the contribution of the acoustic shadow area to the target multi-base scattering sound field. Therefore, the distortion increases with the increase of the multi-base sonar system separation angle.

[0019] In addition, a single simulator cannot accurately simulate the scale characteristics of the target. Only through the combination of multiple simulators can the simulation of the scale characteristics of the target be achieved, and the number of simulators and the amplitude of the simulated signal depend on the acoustic scattering characteristics of the target. It is worth noting that the current underwater target acoustic scattering characteristic simulator has not fully considered the contribution of the acoustic shadow area to the scattered sound field in the multi-base detection mode, and the influence of the change of the target's spatial position on the amplitude fluctuation of the scattered sound field. Therefore, there is still room for improvement in its simulation effect.

[0020] In order to overcome the limitations of existing underwater target acoustic scattering characteristic simulators, the present invention discloses a system and method for simulating underwater target acoustic scattering characteristics for multi-base sonar detection. The simulation system and method not only designs an expandable multi-simulator group to accurately simulate the scale characteristics of the target, but also can simulate the multi-base acoustic scattering waveform of the target that changes with the separation angle and with time in real time. It has the advantages of high fidelity, high maneuverability, and scalability, and provides support for key tasks such as the navy's underwater combat training, test verification and performance evaluation of underwater weapons.

[0021] According to one or more embodiments, Figure 1 As shown in the figure, an underwater target acoustic scattering waveform simulation system for multi-base active sonar detection includes two parts, namely, a target sub-area acoustic scattering waveform simulator group and a system control software. The simulator group includes a transmitting transducer, a buoyancy material, a fairing, a controller module, a wireless communication module, a signal acquisition module and a power supply module; the system control software includes a remote control software (host computer) and an embedded control software (slave computer).

[0022] Figure 1 The architecture of a target acoustic scattering waveform simulation system for multi-base sonar detection is demonstrated. The system includes a target sub-area acoustic scattering waveform simulator group and control software.

[0023] The target sub-area acoustic scattering waveform simulator group includes:

[0024] 1. Buoyancy material, used to provide buoyancy for the system and ensure that the entire simulation system can be stably suspended in the water.

[0025] 2. The deflector is used to reduce the interference of water flow on the propagation of sound waves, ensuring that the sound waves can more accurately simulate the propagation conditions in the actual environment.

[0026] 3. Transmitting transducer, converts electrical signals into sound waves and transmits the sound waves into the water.

[0027] 4. Signal acquisition module, used to collect the sound wave signal reflected by the target object.

[0028] 5. Controller module, responsible for system control and coordination.

[0029] 6. Wireless communication module, used for wireless data transmission between the system and external devices.

[0030] 7. Power supply module, provides power to the system.

[0031] System control software includes:

[0032] 8. Remote control software (host computer).

[0033] 9.Embedded control software (lower computer).

[0034] According to one or more embodiments, Figure 2 The architecture of a sonar detection system is presented. The system is used to simulate and process the acoustic signals of underwater targets. The system consists of multiple modules, including:

[0035] 1. Backend database module: This module divides the target grid file into multiple target sub-areas, and calculates the stimulus response functions of different sub-areas in different directions by applying the multi-base plate element method.

[0036] 2. Human-computer interaction module, including:

[0037] Simulated target parameters, including type (including size), depth, heading, etc., are used to define the characteristics of the target.

[0038] The detection signal parameters, including the direction of the incoming wave, the distance of the incoming wave, the signal waveform, the transmission interval, etc., are used to define the characteristics of the detection signal.

[0039] Output waveform display, used to visualize the processed sound wave signal.

[0040] The background database module and the human-computer interaction module are loaded into the host computer.

[0041] 3. Embedded control software module, which is loaded into the lower computer, includes

[0042] A receiving hydrophone is used to receive underwater acoustic wave signals and, after detecting the signals, initiate subsequent data processing through a trigger unit;

[0043] Data processing includes convolution operation. After the stimulus response functions of different directions of each sub-area are subjected to the convolution operation, the echo signals of each sub-area forwarded in real time are obtained.

[0044] The echo signal is sent to each transmitting transducer through the delay unit.

[0045] The transmitting transducer is used to transmit the sound wave signal.

[0046] Therefore, the lower computer is not only responsible for the echo signal processing of each sub-area, but also sends the processed signals to the upper computer.

[0047] The remote control software (host computer) and embedded control software (slave computer) include:

[0048] (1) System host computer.

[0049] The host computer includes a remote control software based on the client / server structure, which can be located at the shore-based location or remotely located at the shore-based location. The control communicates with the lower computer through the transmission control protocol / Internet interconnection protocol, and realizes high-speed stable transmission with the controller module (lower computer) located in the simulator through Gigabit Ethernet to complete the human-computer interaction function. The host computer part of the system includes the background database module and the human-computer interaction module.

[0050] a. The backend database module contains impulse response functions of different regions and directions of the target. Its construction method is: obtain the target grid file, divide the target into sub-regions according to the contribution of the bright spots on the target surface, and calculate the impulse response functions of different regions and directions through the plate element method applicable to multiple bases.

[0051] b. In the human-computer interaction module, according to the set simulation target parameters (type, depth and heading) and detection signal parameters (incoming wave direction, incoming wave distance, signal waveform, transmission period, etc.), the corresponding control instructions are solved and generated, and the impulse response functions of different target areas and directions stored in the background database are called.

[0052] (2) System slave computer.

[0053] The lower computer software is run by the controller module in the simulator to generate echo simulation signals in different target areas and directions, establish Gigabit Ethernet communication mode, customize the network interconnection protocol, and achieve high-speed, stable and reliable data transmission. The specific workflow is as follows:

[0054] The receiving sonar (hydrophone) continuously collects data. When a detection signal is detected, the trigger unit starts to work and starts to solve the direction and distance of the incoming wave. Then, combined with the host computer setting parameters and the impulse response function of the background database, the convolution operation generates a simulated echo signal in real time. Through the delay unit, after waiting for the transmitting transducer to reach the same position as the incoming wave, the signal is synchronously output through the transmitting transducer to achieve the coordinated triggering of real-time echo.

[0055] A single simulator consists of a transmitting transducer, buoyancy material, a fairing, a controller module, a wireless communication module, a signal acquisition module, and a power supply module. It has zero buoyancy underwater and its center of buoyancy is higher than its center of gravity. The transmitting transducer is fixed on the towline, and a depth gauge is installed at the end of the towline. Then, the scale target is simulated by setting the number of acoustic simulators and their relative positions in space. During the movement of the winch-towing simulator, the hydrophone continuously receives signals. When a detection signal is detected, the trigger unit works and solves the incoming wave direction and uploads it to the host computer. Combined with the set target parameters and transmitting signal parameters, a simulated echo signal is generated in real time and transmitted to the transmitting transducer of the simulator. The multi-base sonar receives the forwarded signal to realize the underwater target scattering waveform simulation for multi-base sonar detection.

[0056] like Figure 3 As shown, Figure 3 -a is a single simulator, which includes a controller module, a signal acquisition module, a buoyancy material and a transmitting transducer. Figure 3 -b is a multi-simulator group, one end of which is connected to the first depth gauge, and the other end is connected to the winch by connecting the receiving hydrophone and the second depth gauge. The hydrophone here is the receiving sonar in the multi-base sonar system disclosed in the present invention. The communication cable or optical cable between the depth gauge, hydrophone, and simulator can also be fixed on the towline. Here Figure 3 This is just an example. In order to comprehensively arrange a multi-base sonar system at multiple angles and in multiple directions, multiple tow cables towed by a winch can be set up. The upper computer controls the winch to tow the multiple tow cables. The same or different numbers of depth setters, simulator groups, and hydrophones can be set on each tow cable as needed. The acoustic scattering characteristics of underwater targets can be simulated according to different combinations to meet different research needs.

[0057] According to one or more embodiments, Figure 4 In the example shown, the present disclosure conducts simulation research on multi-base sonar detection for an underwater Benchmark model, which is provided with a transmitting transducer, and receiving transducers 1, 2, and 3. The geometric acoustic center of the model is taken as the coordinate origin, and the transmitting transducer and the receiving transducer are located in the xy plane, θ i ,θ s and θ b are the incident angle, receiving angle and separation angle of the sound wave respectively. Assume the direction of the incoming wave is θ i =45° and θ i =90°, sound wave emission direction θ s = 0°~360°. The model is divided into two sub-areas, the bow and the stern. The impulse response functions of the two areas are constructed using the plate element method applicable to multiple bases. The simulated echo signals are generated and transmitted to Figure 3 Different transmitting transducers in the simulator group are shown. The bright spots of the underwater target sub-area under these two wave directions are shown in the figure. Figure 5 As shown, the underwater target simulation signal received by the multi-base sonar is as follows Figure 6 As shown. The Benchmark model is a model used to test and evaluate the performance of an acoustic model or algorithm in the embodiments of the present disclosure. The model usually has known acoustic properties and can be used to simulate the acoustic scattering properties of underwater targets. It is used to verify the accuracy and effectiveness of the acoustic model or algorithm when performing acoustic simulation and algorithm development.

[0058] Here, the plate element method applicable to multiple bases is applicable to multi-base sonar detection, that is, emitting sound waves from different positions and receiving target scattered signals. The plate element method is to divide the target into multiple small plate elements, each element can be regarded as an acoustic source, and these acoustic sources contribute to the total acoustic scattering signal together. To simulate the complex geometry and material properties of the target, a more accurate acoustic scattering signal simulation result is generated. For example, the target is divided into two sub-areas, the bow and the stern, and then the plate element technology is applied to each area to construct an impulse response function. These impulse response functions reflect the response of each plate element to the incident sound wave, and the total acoustic scattering signal of the target can be generated by their superposition. In the embodiment of the present disclosure, a simulator in the simulator group is used to simulate the acoustic scattering waveform of a target sub-area, which can simulate the changes in the acoustic wave incident angle, receiving angle and separation angle, as well as the target multi-base acoustic scattering waveform that changes with time, thereby providing a high-fidelity, high-maneuverability, and scalable simulation result.

[0059] Figure 7 The original signal of the underwater target received by the multi-base sonar is given. By comparing the underwater target simulation signal with the original signal, it can be seen that the two are quite consistent, indicating that the simulation system and method proposed in the embodiment of the present disclosure can generate a simulation signal that is highly consistent with the original signal of the underwater target. This degree of consistency shows that the simulation system has high accuracy and reliability, and provides strong support for the testing, verification and optimization of the multi-base sonar system.

[0060] In summary, the beneficial effects of the present disclosure include:

[0061] The innovative plate element method applicable to multiple bases is used, which can accurately simulate the contribution of the acoustic shadow area to the target multi-base scattered sound field, significantly improving the accuracy of the acoustic scattering waveform simulation. In addition, a towed multi-simulator group is designed to accurately simulate the scale characteristics of underwater targets.

[0062] Through the above technical means, the present invention successfully achieves high-fidelity simulation of underwater target acoustic scattering waveforms for multi-base sonar detection, which not only improves the accuracy of the simulation, but also provides a solid foundation for the performance testing, target identification and detection strategy optimization of the multi-base sonar system.

[0063] It should be understood that in the embodiments of the present invention, the term "and / or" is only a description of the association relationship of the associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0064] It is worth noting that, although the foregoing content has described the spirit and principle of the invention with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments, and the division of various aspects does not mean that the features in these aspects cannot be combined, and such division is only for the convenience of expression. The invention is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims.

Claims

1. A multi-base sonar detection underwater target acoustic scattering characteristics simulation system, characterized in that: The system includes, A simulator group, including multiple simulators, for simulating the acoustic scattering characteristics of underwater targets; A plurality of transducers for transmitting sound sources and receiving sound sources to the simulator group; The system control module is used for the operation control and status data analysis of the simulator group and the transducer.

2. The system according to claim 1, characterized in that The model of the underwater target is divided into multiple sub-areas, and the system control module uses a plate element method applicable to multiple bases to construct an impulse response function of the sub-area, generate an echo simulation signal, and transmit it to the simulated transmitting transducer of the simulator group.

3. The system according to claim 1, characterized in that The simulator is fixed to a towing cable connected to a winch.

4. The system according to claim 3, characterized in that The simulator comprises a simulated transmitting transducer, a buoyancy material block, a deflector, a controller, a wireless communication module, a signal acquisition module and a power supply module.

5. The system according to claim 3, characterized in that A depth gauge is also fixedly arranged on the towline.

6. The system according to claim 1, characterized in that The multiple transducers include multiple transmitting transducers and multiple receiving transducers located at different positions.

7. The system according to claim 2, characterized in that The system control module sends the echo simulation signal to each simulator synchronously to achieve synchronous output of the echo simulation signal.

8. The system according to claim 2, characterized in that The system control module includes an upper computer module and a lower computer module. The host computer module is based on a client / server structure, and the backend database module and the human-computer interaction module, The lower computer module is used to generate echo simulation signals of different areas and directions of the underwater target.

9. The system according to claim 3, characterized in that The streamer is provided with a hydrophone.

10. The system according to claim 9, characterized in that When the hydrophone receives the detection signal, it calculates the incoming wave direction and uploads it to the host computer. Combined with the preset underwater target parameters and transmission signal parameters, it generates an echo simulation signal in real time and transmits it to the simulator's simulated transmitting transducer.

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