一種雙基地聲吶直達(dá)波干擾抑制的高分辨算法

徐景峰; 韓樹平; 舒象蘭; 馬鑫; 董永峰

doi:10.11999/JEIT150198

一種雙基地聲吶直達(dá)波干擾抑制的高分辨算法

doi: 10.11999/JEIT150198 cstr: 32379.14.JEIT150198

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出版歷程
- 收稿日期: 2015-02-03
- 修回日期: 2015-07-27
- 刊出日期: 2015-12-19

A High Resolution Algorithm of Direct Path Interference Suppression for Bistatic Sonar

摘要

摘要: 針對(duì)雙基地聲吶系統(tǒng)中存在強(qiáng)直達(dá)波干擾掩蔽目標(biāo)回波的問題，該文在雙基地配置已知的前提下，提出一種直達(dá)波抑制的高分辨算法。該方法在約束條件下將N維空間劃分為兩個(gè)正交子空間，將平滑最小方差無(wú)畸變響應(yīng)(MVDR)算法的掃描權(quán)矩陣分解到各子空間，在約束子空間使用輸出功率最小化法則得到最優(yōu)權(quán)。仿真結(jié)果表明，在僅能提供直達(dá)波大致方位的情況下，該方法在約束方向提供比常規(guī)波束零點(diǎn)更深的零陷，并能對(duì)多個(gè)未知的相干信號(hào)進(jìn)行無(wú)畸變輸出。該算法在抑制強(qiáng)直達(dá)波干擾的同時(shí)具有對(duì)多個(gè)相干目標(biāo)信號(hào)高分辨的能力。
- 雙基地聲吶 /
- 直達(dá)波干擾抑制 /
- 零陷 /
- 高分辨
Abstract: In view of the problem of target echoes interfered by strong direct path-wave in bistatic sonar, a high resolution algorithm of direct path interference suppression is proposed when the deployment is known. The method divides the space of N dimension into two orthogonal subspaces under the condition of constraint, the weight matrix of smoothing MVDR (Minimum Variance Distortional Response) algorithm is decomposed into these subspaces, and the optimal weight is obtained by output power minimization in the constraint subspace. The simulation results show that a deeper null appear at the constraint direction compared to conventional beam when the probable direction just is knew, and it yields distortionless response of multi-coherent unknown signals. The algorithm not only suppresses the direct path interference effectively, but also possesses the capability of high resolution for multi-coherent unknown signals.
- Bistatic sonar /
- Direct path interference suppression /
- Null /
- High resolution

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