基于大尺度目标强亮点散射的时反特性

Time Reversal Performance Based on Large-Scale Target's Scatter of Strength Highlights

针对大尺度目标水下探测问题,首先采用板块元方法由Kirchhoff原理出发从理论上详细推导出目标表面的散射模型,并利用空间坐标系给出了面元的二维散射特性;然后将目标不同区域合成等效目标,在散射特性基础上利用时反聚焦特性建立了与水平线列阵之间的时反模型,结论表明采用时反的板块元大尺度目标识别时,时反时延因子的不同选取能够提高大尺度目标对应区域的处理增益,不但为多点方位估计的高信噪比要求提供了有力平台,且能实现大尺度目标不同区域的准确方位估计;最后,信噪比-15d B条件下MUSIC的目标多点方位仿真结果表明了改进方法探测目标的优越性。

Aiming to underwater detection of large-scale target, firstly we used planar elements method to derive target surface scatter model through Kirchhoff basis, and presented face scatter characteristic in all two-dimension plane based on space coordinate. Then we composed vary areas as effectively targets to establish time reversal model between them and horizon liner array, associated with effectively targets＇ scatter and time reversal focusing characteristics. The conclusion shows when large-scale target using planar elements are identify method based on time reversal, the different chosen of delay parameter can improve the process gain of corresponding areas, not only present strength platform for multiple points orientation estimate on high signal-noise-ratio requirement, but also realize accurate result of large-scale target vary areas orientation. At last, the MUSIC simulation results of target multi-point orientation estimation under the condition of signal-noise-ratio -15dB show the superiority performance of such method.