Multi-channel sonar buoy signal preprocessing system and method

A sonobuoy and preprocessing technology, applied in the field of signal processing, can solve problems such as phase consistency differences, and achieve the effects of good stability, stable differences between multiple channels, and simple structure

Active Publication Date: 2021-02-19
西安瑞祥深海科技有限公司
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Problems solved by technology

While realizing low-noise preprocessing, the present invention solves the stability problem of multi-channel amplitude and phase consistency differences, thereby improving t

Method used

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  • Multi-channel sonar buoy signal preprocessing system and method
  • Multi-channel sonar buoy signal preprocessing system and method
  • Multi-channel sonar buoy signal preprocessing system and method

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specific Embodiment

[0053] The number of sonar signal receiving channels is 24, the system center frequency is 3KHz, and the amplification gain is 120dB. The connecting cable shall be shielded cable.

[0054] The concrete realization of this embodiment is as follows:

[0055] (a) The shielding layer of 24 channels is connected at one point, and the connection point of the shielding layer is connected to seawater when the sonar is working.

[0056] (b) Select INA118 as the preamplifier chip, and TPS4701 as the power supply chip. GND is connected to the shielded metal shell of the preamplifier.

[0057] (c) The second capacitor and the fifth capacitor are connected in parallel, and the capacitance of the fifth capacitor is 2200pF. The second capacitor is disconnected when initially soldering the circuit. The eighth resistor and the ninth resistor are connected in series as the feedback resistor, and the ninth resistor is short-circuited when the circuit is initially welded, and the resistance v...

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Abstract

The invention discloses a multi-channel sonar buoy signal preprocessing system and method, and the system comprises a plurality of channels, and each channel comprises a hydrophone, a shielding cable,a pre-amplification circuit, a phase adjustment circuit, a high-pass filter circuit, a signal amplification circuit, an amplitude adjustment circuit, and a low-pass filter circuit. On the basis of designing the low-noise pre-amplification circuit, the integrated grounding shielding technology is adopted to effectively reduce the broadband noise interference of preprocessing. High-precision resistors and capacitors are used for adjusting the consistency of multiple channels, and the stability degree of the high consistency of the multiple channels is ensured through the reliability of the resistor-capacitor device. According to the invention, while low-noise preprocessing is realized, the stability problem of multichannel amplitude and phase consistency difference is solved, and the multichannel preprocessing performance of sonar is further improved; and meanwhile, the structure is simple, hardware implementation is easy, high practicability is achieved, and application and popularization are convenient.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and in particular relates to a sonar signal preprocessing system. Background technique [0002] The pros and cons of long-distance detection performance of underwater targets by aviation sonobuoys, hanging sonar and other related products depend heavily on the low-noise amplification and filtering technology of weak sonar signals. The low-noise amplification and filtering technologies are summarized as prediction processing technology. When this type of product works on a stand-alone or multi-array basis, the frequency of transmitting and receiving signals is often known. With the development of array technology, the number of sonar receiving channels has increased sharply. In order to improve the detection distance and detection accuracy of the target, the low noise, amplitude consistency, and phase Consistency poses extremely demanding requirements. [0003] There are currently two...

Claims

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Application Information

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IPC IPC(8): H04R3/00H04R3/04
CPCH04R3/00H04R3/04
Inventor 郑琨王英民诸国磊陶林伟牛奕龙王奇
Owner 西安瑞祥深海科技有限公司
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