对数线性调频频控阵双基站探测系统

Bistatic Detection System Based on Logarithmic Increment LFM Frequency Diverse Array

频率分集阵列又称频控阵（FDA），具有距离和角度依赖性。在FDA中使用线性调频可以通过增大带宽来提高定位效果，但依然存在FDA方向图的能量汇聚的周期性特点。合理使用非线性的频率增量或阵元间距可以破坏FDA原有的周期性（如距离周期性），在定位目标时可以更加准确。文中提出一种频控阵与线性调频技术、对数非均匀频率增量相结合的发射波束形成方式，使用双基站进行收发定位，与常规频控阵及对数增量频控阵两种体制的双基站收发方向图进行了对比，说明其具有更好的定位单目标及多目标的效果。

Frequency diverse array （FDA） owns the characteristic of angle and range dependency. The detection effect will be en- hanced by using of linear frequency modulation in FDA system, but it still owns energy focusing periodicity in beam pattern. The proper use of non-linear frequency increment or non-linear inter-element space can damage periodicity of FDA （ for example, range periodicity） in order to realize a better detection performance. In this paper, a novel beamforrming technique which contains the combination of FDA with LFM and non-linear logarithm frequency increment is proposed and a structure of bistatic transmit-receive model is established. The comparisons of this new architecture with normal frequency diverse array and logarithmic frequency incre- ment frequency diverse array are demonstrated, showing that the method proposed in this paper is effective in single or multiple tar- gets detection.