Digital module integrated wet end system

Abstract

The invention relates to the technical field of sonar imaging, in particular to a digital module integrated wet end system, which is characterized in that a switching control module can set a transmitting signal command, receive summarized data, perform signal processing, select a transmitting signal form and a pulse width parameter and start the transmitting command according to a signal processing result; the transmitting module generates a corresponding transmitting signal according to the transmitting command, drives power amplification through a signal source, and drives a transmitting-receiving combined array to transmit a sound signal; the transmitting-receiving combined array receives a target reflection echo signal, the target reflection echo signal is amplified by the acquisition module, the acquisition circuit completes analog signal processing, and the analog signal is transmitted to the switching control module; an FPGA chip in the switching control module converts array element domain data into wave beam domain data, carries out fusion detection and type discrimination signal processing, and then transmits the data to a display picture, thereby realizing an active detection function. By using the system, the array arrangement complexity of the imaging sonar transmitting array and the receiving array is effectively avoided, and meanwhile, the complexity design of multiple interfaces of each circuit is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sonar imaging, and in particular to a digital module integrated wet-end system. Background Art

[0002] With the development of science and technology, the manufacturing technology of divers' equipment, underwater long-distance navigation UUV, frogman carriers, etc. has made great progress. Underwater terrorist activities and sabotage activities against important economic and military targets using these convenient conditions are also increasing, making it possible to launch underwater attacks on ships, docks, underwater key facilities, important targets, etc. The safety of ships and important ports, docks, important targets, etc. must be taken seriously. Usually, active sonars are in the form of strip arrays or T-arrays, which greatly increases the difficulty of underwater target identification and false alarms, and physical installation and deployment are difficult.

[0003] Therefore, it is urgent to carry out research on digital module integrated wet-end system technology with miniaturization, integration and high-performance computing capabilities in response to the characteristics of mines in shallow waters near the shore, such as easy deployment and difficult removal, and complex environment, high intensity and timeliness of anti-mine combat missions. Summary of the invention

[0004] The present invention provides a digital module integrated wet-end system, which avoids the complexity of arranging the imaging sonar transmitting array and receiving array, and greatly reduces the complex design of multiple interfaces of each circuit.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A digital module integrated wet-end system, comprising a switching control module, a collection module, a transmitting module, and a transmitting and receiving array;

[0007] The switching control module can set the transmission signal command, receive the summary data and perform signal processing, select the transmission signal form and pulse width parameters according to the signal processing results, and start the transmission command;

[0008] The transmitting module generates a corresponding transmitting signal according to the transmitting control command, drives the power amplifier through the signal source, and drives the transmitting and receiving array to transmit the sound signal;

[0009] The transceiver array receives the target reflected echo signal, completes analog signal conditioning, A / D conversion and data aggregation through the amplification and acquisition circuit of the acquisition module, and transmits it to the switching control module;

[0010] The FPGA chip in the switching control module converts the array element domain data into beam domain data, performs fusion detection and type identification signal processing, and then transmits it to the display screen to realize the active detection function.

[0011] As an optimal technical solution for a digital module integrated wet-end system, the switching control module is capable of realizing signal processing based on a three-dimensional intelligent focused acoustic imaging method.

[0012] As an optimal technical solution for a digital module integrated wet-end system, the transmitting module includes a signal source, which is composed of a multi-channel full-digital power amplifier module. A PWM signal is obtained by sampling the analog signal and outputting a power amplifier module.

[0013] As an optimal technical solution for a digital module integrated wet-end system, the acquisition module adopts adjustable gain control, performs A / D conversion after conditioning the analog signal of the transceiver array, and then packages the data and uploads it to the network switching circuit. The network switching circuit packages and summarizes the data of the acquisition circuit at the same time and transmits the data to the switching control module according to the UDP protocol.

[0014] As a preferred technical solution for a digital module integrated wet-end system, the transceiver array is arranged in the form of a longitudinal transducer.

[0015] Compared with the prior art, the digital module integrated wet-end system provided by the present invention has the following significant beneficial effects:

[0016] The present invention is based on the sonar technology of high-definition and stable imaging of targets in extremely shallow water environments. It is based on a planar array and adopts the principle of active detection. The switching control module controls the transmitting module to select and transmit a pre-selected signal, starts the transmitting command, and the transmitting module drives the transmitting and receiving array to transmit the sound signal. The transmitting and receiving array receives the echo signal reflected by the target, and after the amplification and acquisition circuit in the acquisition module completes analog signal conditioning, A / D conversion and data aggregation, after the FPGA completes beamforming, fusion detection, type identification and other signal processing, it is transmitted to the display screen via Gigabit Ethernet to realize the active detection function. The use of this system effectively avoids the complexity of the array arrangement of the imaging sonar transmitting array and the receiving array, and greatly reduces the complexity of the design of multiple interfaces of each circuit. The use of a digital module integrated wet-end system is easy to install and carry, and increases the receiving dimension and the receiving gain. This has practical significance for the development of imaging sonar and lays a foundation for engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the workflow of the present invention

[0018] Figure 2 Schematic diagram of the system structure of the present invention

[0019] Figure 3 Schematic diagram of the structure of the present invention DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the drawings 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 belong to the protection scope of the present invention.

[0021] like Figures 1 to 3 As shown in the figure, the digital module integrated wet-end system is mainly composed of four modules. The switching control module is responsible for receiving commands and controlling the array to transmit and receive signals, and also has the signal processing function of data; the acquisition module is responsible for receiving array signals and arranging and transmitting them to the switching control module; the transmitting module is responsible for controlling the array to transmit signals; the array is a transducer that combines transmission and reception, and is responsible for receiving and transmitting signals. The schematic diagram of the system workflow is shown in the figure below. Figure 1 As shown. Specifically, the digital module integrated wet-end system disclosed in the present invention includes a switching control module, an acquisition module, a transmitting module, and a transceiver array; the switching control module can set a transmission signal command, receive summary data and perform signal processing, select the transmission signal form and pulse width parameters according to the signal processing result, and start the transmission command; the transmitting module generates a corresponding transmission signal according to the transmission control command, drives the power amplification through the signal source, and drives the transceiver array to transmit the sound signal; the transceiver array receives the target reflection echo signal, completes analog signal conditioning, A / D conversion and data aggregation through the amplification and acquisition circuit of the acquisition module, and transmits it to the switching control module; the FPGA chip in the switching control module completes the conversion of the array element domain data into the beam domain data, performs fusion detection, and type identification signal processing, and then transmits it to the display screen to realize the active detection function.

[0022] The functions of each module are as follows:

[0023] Switching control module: Set the transmission signal command, receive and summarize data and perform signal processing. Three-dimensional intelligent focusing high-definition acoustic imaging technology: The detection spatial resolution of miniaturized collision avoidance sonar is constrained by the limited receiving aperture. The spatial resolution under long-distance detection conditions cannot meet the target positioning and imaging requirements, affecting the subsequent target detection, tracking, and identification based on sonar images. A series of algorithm processing effects. To address this problem, a three-dimensional beamformer is developed, and the algorithm structure is optimized to reduce the complexity of the algorithm while realizing online real-time imaging of the algorithm under the conditions of a small computing power platform.

[0024] Transmitter module: The signal source generates a corresponding transmission signal according to the transmission control command, drives the power amplifier circuit through the circuit, and then drives the transceiver array to transmit the sound signal. The signal source is composed of a multi-channel full-digital power amplifier module, in which the transmission module is composed of a PWM board and a power amplifier board. The high-efficiency Class D power amplifier is generally used, which obtains the PWM signal by sampling the analog signal, controls the high-power switch tube to work in the switch state module, and the transmission signal goes through the processing flow of "digital-DA-analog-sampling-digital (PWM)-high-power analog".

[0025] Acquisition module: The acquisition module is responsible for filtering and amplifying the analog signals of the transceiver array. The acquisition module uses adjustable gain control to condition the analog signals of the transceiver array and perform A / D conversion. Then, the data is packaged and uploaded to the network switching board using the Gigabit Ethernet interface. The network switching circuit packages and aggregates the data of the acquisition circuit at the same time and transmits the data to the switching control module through the Gigabit Ethernet interface according to the UDP protocol. The control commands between the switching control module and the network switching circuit, and between the network switching circuit and the acquisition circuit are transmitted through the network. The sampling clock signal and synchronization signal of the acquisition circuit are uniformly provided by the network switching circuit using the RS422 interface.

[0026] Transceiver combined array: mainly responsible for the physical transmission and reception of sound signals.

[0027] In the present invention, the combined transmitting and receiving array adopts the form of a longitudinal transducer, which has the advantages of high electroacoustic conversion efficiency and unidirectional radiation. The main feature is that it has the functions of both transmitting and receiving arrays. The main components of the longitudinal transducer include a front cover plate, a piezoelectric crystal stack, a rear cover plate, prestressed bolts and electrodes. The piezoelectric crystal stack is used as the transducer material of the transducer, and its main purpose is to achieve efficient conversion between electrical energy and acoustic energy. Since the piezoelectric ceramic material has high compressive strength and low tensile strength, in order to avoid damage to the ceramic, the method of adding prestress at both ends of the ceramic is adopted to ensure that the transducer works in a reasonable compression state. The prestressed bolt is the most important link of the entire transducer. It not only provides a constant and large prestress, but also has good elasticity to avoid the performance degradation of the transducer due to the prestressed bolt. The energy generated by the longitudinal transducer is radiated from the front cover plate into the water. By properly selecting the geometric dimensions, materials and other parameters of the front cover plate, efficient and broadband transmission can be achieved. The rear cover of the transducer is mainly designed to achieve unidirectional radiation to the maximum extent, and is generally designed to be cylindrical or conical to reduce the proportion of radiation energy from the rear cover. According to the law of conservation of momentum, in order for the front cover to obtain a larger vibration velocity, the front cover is generally made of light metals, such as aluminum or magnesium-aluminum alloy, while the rear cover is made of heavy metals, such as copper or 45# steel.

[0028] With the continuous development of modern underwater acoustic warfare and submarine stealth technology, the detection of complex underwater targets has become increasingly difficult, which has seriously challenged the detection capabilities of active sonar and passive sonar. Therefore, the acoustic scattering characteristics of the combined transmitter and receiver have become a research hotspot for new underwater detection technologies. The combined transmitter and receiver means that the same array with the same aperture is used for transmission and reception. The combined transmitter and receiver array has more channels than the single receiver and transmitter array. For active sonar, when the installation size is limited, the combined transmitter and receiver array can increase the array gain, thereby enhancing the detection capability of active sonar, which is of great significance in engineering implementation.

[0029] The FPGA chip is used to realize the control of the combined transmitting and receiving array. The transmitting and receiving functions of the circuit can be controlled only through software programming, and the form of the transmitted signal can be changed. The switching time of the combined transmitting and receiving array and the type of transmitted signal can be changed according to user needs in the future, which facilitates the maintenance and secondary development of the equipment, realizes digital modularization, and avoids the complexity of traditional pure hardware implementation. At the same time, it has accumulated a technical foundation for digital circuits.

[0030] In order to solve the problem that the multi-dimensional received signal beamforming calculation is huge and cannot meet the real-time requirements, the advantages of FPGA parallel calculation of the switching control module are fully utilized, and the RT-DFBT method is used based on the principle of area and speed interchange. The problem of efficient processing is solved by two methods: table lookup method and real-time calculation. Part of the signal processing is completed underwater, and the processing results are transmitted to the display interface through the gigabit network, which greatly reduces the connection relationship of the analog signal.

[0031] The digital module integrated wet-end system is based on the sonar technology of high-definition and stable imaging of targets in extremely shallow water environments. It is based on the area array and adopts the principle of active detection. The switching control module controls the transmitting module to select and transmit the pre-selected signal, start the transmission command, and the transmitting module drives the transceiver array to transmit the sound signal. The transceiver array receives the echo signal reflected by the target, and after the amplification and acquisition circuit in the acquisition module completes the analog signal conditioning, A / D conversion and data aggregation, the FPGA completes the signal processing such as beam forming, fusion detection, and type identification, and then transmits it to the display screen via Gigabit Ethernet to realize the active detection function.

[0032] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0033] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these changes and deformations should all fall within the scope of protection of the claims of the present invention.

Claims

1. A digital module integrated wet end system, characterized in that: It includes a switching control module, a collection module, a transmitting module, and a transmitting and receiving array; The switching control module can set the transmission signal command, receive the summary data and perform signal processing, select the transmission signal form and pulse width parameters according to the signal processing results, and start the transmission control command; The transmitting module generates a corresponding transmitting signal according to the transmitting control command, drives the power amplifier through the signal source, and drives the transmitting and receiving array to transmit the sound signal; The transceiver array receives the target reflected echo signal, completes analog signal conditioning, A / D conversion and data aggregation through the amplification and acquisition circuit of the acquisition module, and transmits it to the switching control module; The FPGA chip in the switching control module converts the array element domain data into beam domain data, performs fusion detection and type identification signal processing, and then transmits it to the display screen to realize the active detection function.

2. A digital module integrated wet end system according to claim 1, characterized in that: The switching control module can realize signal processing based on a three-dimensional intelligent focused acoustic imaging method.

3. A digital module integrated wet end system according to claim 1, characterized in that: The transmitting module includes a signal source, which is composed of a multi-channel full-digital power amplifier module. The PWM signal is obtained by sampling the analog signal and the output is a power amplifier module.

4. A digital module integrated wet end system according to claim 1, characterized in that: The acquisition module adopts adjustable gain control, performs A / D conversion after conditioning the analog signal of the transceiver array, and then packages the data and uploads it to the network switching circuit. The network switching circuit packages and summarizes the data of the acquisition circuit at the same time and transmits the data to the switching control module according to the UDP protocol.

5. A digital module integrated wet end system according to claim 1, characterized in that: The transmitting and receiving combined array is arranged in the form of a longitudinal transducer.

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