机载双基STAP非线性时变加权技术的研究

The study on air-borne bistatic STAP nonlinearly time-varying weighting techniques

针对机载双基地雷达杂波的距离相关特性,提出一种新的基于非线性时变加权(NL-TVW)技术的空时自适应处理(STAP)方法用于抑制双基杂波。该方法考虑了双基杂波角度-多普勒频率特性随距离变化的非线性因素,可有效抑制来自远、中及近距离场景中的杂波回波。此外,NL-TVW方法是与数据相关的,可自适应地补偿双基杂波的距离非平稳性而无需了解有关雷达平台或场景的先验知识。仿真结果表明:在不同双基距离的场景下,非线性时变加权法比基于线性时变加权的STAP方法和无任何补偿措施的双基STAP方法有更优的杂波抑制性能。

To deal with the range dependency of airborne bistatic clutter, a novel space-time adaptive processing （STAP） approach based on the nonlinearly time-var- ying weighting （NL-TVW） is proposed for bistatic clutter suppression. The non- linear factors contained in the range-varying characteristics of angle-Doppler fre- quency are taken into accounted by the method, and can effectively suppressing the bistatic clutter returns reflected from the far, middle and near distance scenarios. Moreover, the NL-TVW is a data-dependent method and can adaptively compensate the range nonstationarity of bistatic clutter without the prior knowledge of the mov- ing platforms and the environment. The simulation results manifest that the NL- TVW has superior clutter rejection performance compared with the STAP based on the linear time-varying weighting and the traditional bistatic STAP without any compensation strategies in the scenarios of different bistatic ranges.