基于Radon变换的浅海低SNR目标被动测距算法  

Passive Range Algorithm of Low SNR Source in Shallow Water Based on Radon Transform

作　　者：李丹阳 LI Dan-yang(Basic Science Department,Air force Engineering University,Xi'an Shanxi 710051,China)

机构地区：[1]空军工程大学基础部,陕西西安710051

出　　处：《计算机仿真》2022年第1期6-9,39,共5页Computer Simulation

摘　　要：针对在较低信噪比情况下,无法清晰观测浅海波导中宽带声源干涉条纹,利用Radon变换估计条纹斜率会出现误差,影响声源被动测距精度的问题,提出一种针对声强干涉条纹进行二维傅里叶变换,获得二维傅里叶变换脊,利用Radon变换估计脊的斜率,准确估计目标声源距离的方法。基于波导不变量的概念,对干涉条纹进行二维傅里叶变换,根据脊的斜率与干涉条纹的斜率之间对应关系,通过Radon变换估计脊的斜率换算出干涉条纹斜率,最终实现目标被动测距。数值仿真在不同信噪比情况下算法改进前后目标测距的效果对比,发现所提算法可以获得2dB增益,即在更低信噪比条件下实现被动测距,验证所提方法的有效性。In the case of low SNR,it is impossible to observe the interference striations of wideband sound sources in shallow water clearly. And there will be errors in estimating striation slope by Radon transform, which will cause errors and affect the accuracy of passive range. To solve this problem, a method is proposed to obtain the interference striations of sound intensity by performing two-dimensional Fourier transform, estimate the slope of the ridge by Radon transform, and accurately estimate the target sound source distance. Based on the concept of waveguide invariants, the interference striations were transformed into two-dimensional Fourier transform. According to the corresponding relationship between the slope of ridge and the slope of interference striations, the slope of interference striations was converted from the slope of ridge estimated by Radon transform, and finally the passive range of source was realized. Numerical simulation shows that the proposed algorithm can obtain a gain of 2 dB when the algorithm is improved under different SNR conditions. In other words, the proposed algorithm can achieve passive range under lower SNR conditions, which verifies the effectiveness of the proposed method.

关 键 词：二维傅里叶变换脊 拉冬变换 波导不变量 测距 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]