摘要
为实现强杂波噪声条件下SAR微动目标检测,在DPCA信号的距离压缩域提出基于Radon变换和基于时频分析—逆Radon变换的2种微动目标检测方法。在距离压缩域,微动目标回波表现为沿方位向直线,利用Radon变换对直线的聚焦性实现微动目标检测;对DPCA信号作时频分析,微动目标引起的微多普勒频率表现为正弦形式,利用逆Radon变换对正弦曲线的聚焦性实现微动目标检测。通过对比,基于Radon变换的检测方法参数估计性能更好,而基于时频分析—逆Radon变换的检测方法具有更高的检测概率。最后,通过实验仿真验证了所提方法的有效性。
In order to detect micro-motion targets against strong ground clutter, the DPCA （ displaced phase center antenna） is introduced to cancel the clutter in SAR （synthetic aperture radar）-GMTI（ ground moving target indication） system, then two detection algorithm of micro-motion targets are proposed ： the first one is based on the Radon transform, the other one based on time-frequency analysis and inverse Ra- don transform. Under the range-compressed data domain, the echo presents a beeline along the direction of azimuth. Similarly, the micro-motion can be detected by inverse Radon transform, because the micro- Doppler frequency produced by micro-motion is a sine wave which can be presented by time-frequency transform. Compared with the two algorithms, the method based on Radon transform can achieve better micro-motion parameter estimation result, while the method based on inverse Radon transform can realize bigger probability in detecting micro-motion target. Simulation results show effectiveness of the proposed algorithm.
出处
《现代防御技术》
北大核心
2015年第3期151-157,164,共8页
Modern Defence Technology
基金
航空科学基金(20145596025)
关键词
合成孔径雷达
微动目标
DPCA
RADON变换
逆Radon变换
synthetic aperture radar （SAR）
micro-motion target
displaced phase center antenna（DPCA）
Radon transform
inverse Radon transform
