基于频控阵的多普勒波束锐化高度表设计

多普勒波束锐化(Doppler beam sharpening, DBS)是飞行器实施地形跟随或地形回避的重要技术。针对飞行器高度表在DBS工作模式的射频隐身需求, 利用频率分集阵列(frequency diversity array, FDA)研究了基于射频隐身的DBS高度表。首先通过研究FDA的辐射方向图特性, 分析了FDA的频率增量依赖特性及其距离周期性对DBS模式的影响。以此为基础, 给出了对于DBS高度表的约束条件, 包括了FDA阵元间频率增量、脉冲重复频率、脉宽等, 同时建立了FDA-DBS高度表的射频隐身模型。仿真表明, 相对于相控阵和多输入多输出等阵列, 基于FDA的DBS高度表具有优秀的射频隐身性能。

Design of Doppler beam sharpening altimeter based on FDA

Doppler beam sharpening (DBS) is an important technology for aircraft to implement terrain following or terrain avoidance. Aiming at the radio frequency (RF) stealth requirement of the altimeter in the aircraft working under the DBS mode, this paper uses frequency diversity array (FDA) to study the DBS altimeter based on RF stealth. Firstly, the influence of the frequency increment dependence characteristic and distance periodicity of the FDA on the DBS mode is analyzed, by studying the characteristics of the FDA radiation pattern. Based on this, the constraint conditions for the DBS altimeter are given, including the frequency increment between FDA array elements, pulse repetition frequency, pulse width and so on. Meanwhile, the RF stealth model of the FDA-DBS altimeter is established. Simulation shows that the DBS altimeter based on FDA has the best RF stealth performance, compared to phased arrays and multiple input multiple output arrays.