基于 Welch法的潜艇磁场频域信号特征分析

Frequency Domain Analysis of the Submarine Magnetic Field Signal Based on Welch Method

摘要:

航空磁探仪通过高灵敏度磁力仪测量空间中的磁异常曲线来探测水下磁目标是否存在。由于对水下磁目标磁异常信号的特征掌握较少等原因,目前磁探仪对目标探测距离近,检测概率低,识别能力不足,探测效果不够理想。磁异常信号特征分析是提高航空磁探仪检测性能的基础性工作,文章运用一种平均周期图法对潜艇磁异常信号进行功率谱分析,得到了潜艇在不同下潜深度、不同航行速度下的功率谱曲线,为更好地对潜艇进行探测与识别提供依据。

Abstract:

The aerial magnetic detector uses a high-sensitivity magnetometer to measure the magnetic anomaly curve inspace to detect the existence of underwater magnetic targets. Since the characteristics of magnetic anomaly signals of un?derwater magnetic targets are less known, the detection distance of the airborne magnetic anomaly detection system for thetarget is near, the detection probability is low and the detection effectiveness is limited. In order to improve the detectionperformance of the aerial magnetic detector, it is necessary to analyze the characteristics of the magnetic anomaly signal.The paper analyzes the power spectrum of the submarine’s magnetic anomaly signal by Welch method. The power spec?trum curves of the submarine at different depths and different speeds are obtained, which provides a basis for better detec?tion and identification of the submarine.