宽带高斯谱噪声雷达高速目标检测  

Detection of high speed targets in noise radar with wideband Gaussian spectrum

作　　者：王钊[1] 顾红[1] 苏卫民[1] 樊劲宇[1] 陈金立[2] 

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094 [2]南京信息工程大学电子与信息工程学院,江苏南京210044

出　　处：《系统工程与电子技术》2015年第6期1266-1272,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61302188);部预研基金(9140A07010713BQ02025);教育部博士点基金(20113219110018);中国航天科技集团公司科技创新基金(CASC04-02);江苏省自然科学基金(BK20131005)资助课题

摘　　要：宽带高斯谱噪声信号由于无距离旁瓣、硬件产生容易等特点而广泛应用于现代雷达。但是噪声信号是多普勒敏感信号,而宽带噪声信号在检测高速目标时存在多普勒色散效应,使得其多普勒敏感性同时体现在多普勒频移及包络伸缩中。为了说明多普勒色散效应对匹配滤波的影响,本文推导了宽带高斯谱噪声信号的广义相关函数表达式,定量分析了在不考虑多普勒频移的理想情况下,信噪比损失和距离分辨力二者与多普勒色散积之间的关系。针对此问题,以系统实时性为出发点,提出了一种改进的噪声雷达频域处理算法,并评估了算法的性能和运算复杂度。仿真结果验证了理论分析和算法的有效性。The wideband Gaussian spectrum noise signal is widely used in modern radar due to its characteristics of no distance sidelobe and hardware-generating easily. But the noise signal is Doppler sensitive, and the Doppler sensitive characteristic in wideband noise signal is reflected both in Doppler shift and envelope stretch, owing to the Doppler dispersion effect exists in high speed target detection. To illustrate the influence of the Doppler dispersion on matched filtering, the expression of generalize correlation function with wideband Gaussian spectrum noise signal is derived, and the relationships between Doppler dispersion product and both the signal to noise ratio loss and range resolution are analyzed quantitatively in the case of no Doppler shift. For this problem, taking the starting point as tht real time system, an improved multi channel processing algorithm in fre quency domain is proposed, then the performance and complexity of the algorithm are evaluated. The validaty of theoretical analysis and algorithm is verified by the simulation results.

关 键 词：宽带噪声信号 多普勒色散 重采样 离散傅里叶变换 

分 类 号：TN957[电子电信—信号与信息处理]