变速平台STAP的数据域补偿方法  

Data domain compensation for STAP with maneuvering platform

作　　者：徐雪菲[1] 廖桂生[1] 许京伟[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2016年第6期1221-1227,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61231017)资助课题

摘　　要：空时自适应处理(space-time adaptive processing,STAP)是抑制因平台运动导致谱展宽的地物杂波的有效技术,近三十年来受到广泛关注,其中平台运动通常假设为匀速。分析了变速平台情况下地物回波多普勒谱特性,相比传统匀速平台情况,杂波回波的多普勒谱展宽更严重,且展宽程度与阵列面向、散射点位置以及脉冲积累均有关;因此,变速平台情况下,直接采用传统的STAP方法,其杂波抑制性能,尤其是在主杂波区的性能变差,严重降低慢速目标检测性能。对此,提出一种基于数据域的补偿方法,通过构造补偿矩阵抑制加速度在相位上产生的增量,从而抑制杂波的多普勒谱展宽。仿真结果表明,所提方法可使杂波多普勒谱变窄、STAP的杂波抑制改善因子提高,尤其慢速目标的检测性能明显提高。Space-time adaptive processing （STAP） has received much attention in recent 30 years, because it is an effective technology in suppressing the ground clutter whose Doppler spectrum is spread due to the mo- tion of the platform. In the situation of STAP with maneuvering platforms, the Doppler spectrum of the clutter will be broadened further compared with that of the constant velocity platforms, and the Doppler spread is related to the direction of the linear arrays, the positions of the scatters and the number of pulses. Consequently, in maneuvering platform situations, the system performance will be decreased significantly if the conventional STAP method is used directly, especially in the main lobe area. To solve this problem, a data domain-based compensation method which can decrease the additional phase factor due to the acceleration of the moving plat- form is proposed in this paper. The narrowed down Doppler spectrum of the clutter with the proposed method is shown in the simulation and the improved minimal discernable velocity （MDV） is shown by the improvement factor （IF） curves.

关 键 词：空时自适应处理 机动平台 杂波抑制 运动补偿 

分 类 号：TN957[电子电信—信号与信息处理]