基于双曲调频波形稀疏重构的干扰抑制方法

双曲调频波形特有的多普勒不变性使其在远程高速目标成像方面具有显著优势。然而波形的非线性调频特性限制了其在现有宽带解调频接收系统中的应用, 且在间歇采样转发干扰情形下成像性能退化。为此, 在分析目标双曲调频波形解调频回波特性的基础上, 提出一种基于稀疏重构的干扰抑制方法。首先, 构建了双曲调频波形解调频回波模型与间歇采样转发干扰时域抑制模型。其次, 基于此模型建立了相应的稀疏矩阵, 并利用目标结构稀疏特性对重建算法进行了加速。所提出的干扰抑制与波形成像方法可实现干扰有效抑制和多目标聚焦成像。最终, 通过电磁仿真数据验证了所提方法的有效性。

Jamming suppression method for hyperbolic frequency modulated waveform based on sparse reconstruction

Hyperbolic frequency modulated (HFM) waveform has a significant advantage in long-distance high-speed target imaging due to the characteristic of Doppler invariance. However, nonlinear frequency modulation limits the application of HFM waveform in demodulated receiving system. At the same time, the imaging performance is degraded significantly under the interrupted sampling repeater jamming (ISRJ). Accordingly, on the basis of analyzing the characteristics of HFM wideband stretching echo, a jamming suppression method based on sparse reconstruction is proposed. Firstly, the HFM wideband stretching waveform model and time domain suppression model of ISRJ are derived. Then, specific sparse matrices are constructed and the algorithm is accelerated due to the sparse structure information of targets. Therefore, the proposed method can not only suppress jamming but also reconstruct focused images of multi-targets. Finally, electromagnetic simulation datas verify the effectiveness of the proposed method.