一种基于谐波数估计的距离扩展目标检测算法

Harmonic wave number estimation detector for range spread targets

宽带雷达的目标回波信号分布在多个距离分辨单元内,被称为距离扩展目标。距离扩展目标信号傅里叶变换后在距离频率域可表示为由散射点强度和相对位置决定的不同幅度、频率和相位谐波叠加的谐波过程。将高斯白噪声中距离扩展目标检测问题转换为谐波过程的谐波数估计问题来进行目标检测。给出了高斯白噪声中使用总体最小二乘奇异值分解的谐波数估计的距离扩展目标检测器,对检测器的性能分析表明该检测器具有恒虚警性能。使用模拟数据和实测飞机数据的计算机仿真实验表明,本文提出的检测器比能量积累检测器有更好的检测能力。

Wideband radar target echo signals are distributed into many range resolution cells, which are named as range spread targets. Range spread targets signal are in harmonic wave process in range frequency domain after Fourier transform, in which amplitude, frequency and phases depend on the scatters strength and relative range to radars. The range spread targets detection is transformed to the harmonic wave number estimation. The harmonic wave number estimation algorithm for range spread targets detection with singular value decomposition-total least squares is presented and the performance of the detector is analyzed, which showes that the detector is a constant false alarm rate detector. Computer experiments with simulation and measured high range resolution profile data of airplanes show that the proposed detector outperforms the energy integration detector.