摘要
针对传统几何参数估计方法对成像质量要求较高,对低信噪比、稀疏孔径的散射回波数据估计精度低的问题,选择球头锥目标为研究对象,提出了 一种使用几何参数散射模型和正交匹配追踪(orthogonal matching pursuit,OMP)算法相结合的方法,简化了计算过程,提升了参数估计精度.该方法首先根据先验信息确定代估参数的取值范围,并等间隔地在取值范围内设置参数网格,再根据对应的参数值计算散射模型,生成二维像,之后通过OMP算法拟合回波信号的成像结果,得到精确的几何参数估计值.所提方法实现了在原始回波数据质量较差的情况下,对球头锥类目标的几何参数精确估计与重构.
Abstract
Aiming at the problem that traditional geometric parameter estimation methods have high requirements for imaging quality and low estimation accuracy for scattered echo data with low signal-to-noise ratio and sparse aperture,spherical cone target is selected as the research object,and a new method using geometric parameter scattering model and orthogonal matching pursuit(OMP)algorithm is proposed,which simplifies the computing progress and improves the performance of parameter estimation.The method first determines the value range of the proxy estimation parameters according to the prior information,and sets parameter grids in the value range at equal intervals,then calculates the scattering model according to the corresponding parameter values to generate a two-dimensional image,and then fits the imaging results of the echo signal through OMP algorithm to obtain accurate geometric parameter estimates.The proposed method achieves accurate estimation and reconstruction of geometric parameters of spherical cone targets in the presence of poor quality raw echo data.
维普
万方数据