基于旋转天线的二维高分辨成像算法

High Resolution Two-Dimensional Imaging Algorithm Based on Rotating Antenna

受涡旋电磁波产生方法和自旋目标成像方法的启发,提出了基于旋转天线的二维高分辨成像方法。首先构造了基于旋转天线的雷达观测模型;利用距离向傅里叶变换获取目标的距离仿真,推导出了包含目标方位角信息的多普勒效应的正弦表达式;最后将正交匹配追踪算法应用到该正弦信号中,重构出目标的方位角,有效提升了雷达波束范围内的方位角分辨能力。仿真实验证明,该算法对雷达性能要求较低,克服了成像质量对纯净的高模态涡旋电磁波的依赖,实现了对静止目标的二维高分辨成像。

The vortex electromagnetic wave being generable and the spinning target being imageable,a high-resolution two-dimensional imaging method based on the rotating antenna is proposed.A radar observation model based on the rotating antenna is constructed firstly,and then the target range information is obtained by using the range direction fast Fourier transform(FFT),and the sinusoidal expression of Doppler effect containing the target azimuth information is derived.Finally,the orthogonal matching pursuit(OMP)algorithm is applied to the sinusoidal signal to remake at an angle of azimuth to the target,effectively improving the azimuth angle resolution in the range of radar beam.The algorithm requires radar to be low in the performance,overcoming the dependence of image quality on pure multi-mode vortex electromagnetic wave,and achieving high-resolution two-dimensional imaging of stationary targets.The simulation results show that the proposed algorithm is valid and robust.