The small frequency offset across the array elements in frequency diverse array (FDA) radars leads to the range-angle-time dependent beampattern of FDA radars which is different from the angle-only dependent beampattern of the traditional phased arrays. In this paper, a simple signal model for the received signal in pulsed FDA radars is derived and it is shown that the transmitted signal is amplitude modulated by a digital sinc function which depends on the angle of the scatterer. Then, a signal design framework is presented based on the derived model in which it is represented that how the angular coverage zone and range resolution depend on pulsed FDA radar parameters. After that an iterative low complexity constant false alarm rate (CFAR) Generalized Likelihood Ratio Test (GLRT)-based detector for general FDA radars is derived to detect multiple targets in the presence of clutter and noise. The performance of the proposed detection algorithm is verified by simulation results.

频分集阵列 (FDA) 雷达中阵列元件之间的小频率偏移导致 FDA 雷达的距离-角度时间相关波束图与传统相控阵的仅角度相关波束图不同。本文推导了脉冲 FDA 雷达中接收信号的简单信号模型，并表明发射信号由取决于散射体角度的数字 sinc 函数进行幅度调制。然后，基于导出的模型提出了一个信号设计框架，其中表示了角度覆盖区域和距离分辨率如何依赖于脉冲 FDA 雷达参数。之后，推导出用于通用 FDA 雷达的基于迭代低复杂度恒定误报率 (CFAR) 广义似然比测试 (GLRT) 的探测器，以在存在杂波和噪声的情况下检测多个目标。仿真结果验证了所提出的检测算法的性能。