Design of an Underwater Real-Time Integrated Electromagnetic Detection System
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摘要: 针对目前水下目标电磁探测系统探测物理量单一、实时性差、综合适应能力弱等问题, 文中采用超低噪声信号检测和放大、自动增益控制等技术, 研制了一套水下实时综合电磁探测系统, 实现了高精度、宽动态范围的电磁信号采集、存储及网络实时传输。实验室环境测试验证了该系统具备电磁场信号的高精度采集和实时传输能力, 电场通道本底噪声为2 nV/
$\sqrt {{\text{Hz}}} $ @1 Hz, 磁场通道本底噪声为0.12 μV/$\sqrt {{\text{Hz}}} $ @1 Hz, 网络实时传输速率为6.32 MB/s。Abstract: To address the issues of single physical quantity detection, poor real-time performance, and weak comprehensive adaptability in current underwater target electromagnetic detection systems, an underwater real-time integrated electromagnetic detection system was developed by using the technology of ultra-low noise signal detection and amplification, automatic gain control, etc. The system achieved high-precision electromagnetic signal acquisition, storage, and network real-time trans- mission within a wide dynamic range. Laboratory tests have validated the system’s ability to acquire high-precision electromagnetic field signals and transmit them in real time. The background noise of the electric field channel is 2 nV/$\sqrt {{\text{Hz}}} $ @1 Hz, and that of the magnetic field channel is 0.12 μV/$\sqrt {{\text{Hz}}} $ @1 Hz, while the network real-time transmission rate is 6.32 MB/s. -
图 1 水下实时综合电磁探测系统总体设计示意图
Figure 1. Overall design of underwater real-time integrated electromagnetic detection system
图 2 电磁记录仪硬件设计框图和实物图
Figure 2. Hardware design and prototype of electromagnetic recorder
图 8 信号采集与数字主控电路框图
Figure 8. Block diagram of signal acquisition and digital main control circuit
图 11 电磁场通道本底噪声测试结果
Figure 11. Background noise test results of electromagnetic field channel
图 12 电场通道幅相频率特性测试结果
Figure 12. Amplitude and phase frequency characteristic of electric field channel
表 1 系统测试指标
Table 1. Parameters of system test
指标 数值 电场通道噪声/(nV/$\sqrt {{\text{Hz}}} $@1 Hz) 2 磁场通道噪声/(μV/$\sqrt {{\text{Hz}}} $@1 Hz) 0.12 电场通道增益倍数 500~50 000 电场通道/个 3 感应磁场通道/个 2 环境总磁场通道/个 3 网络带宽/(MB/s) 6.32 程控增益支持倍数 0、1、2、5、10、20、50、100 
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