基于双频融合的微波全息成像算法研究

针对单频微波全息成像算法在目标距离向分辨率的局限性,提出一种基于双频融合的微波全息成像算法。该算法通过将对目标的照射频率从单频扩展至双频,以获取目标高斯相位信息,并利用此相位信息增加对目标距离向的分辨能力,抑制在单频成像过程中出现的距离混叠效应。利用Matlab对基于双频融合的微波全息成像算法进行性能仿真,并通过在仿真中增加空间采样位置抖动作为非理想因素来检验该算法的实际应用鲁棒性,最终利用实验平台验证该算法在目标探测应用中的有效性。实验结果表明,基于双频融合的成像算法可减少相近目标距离向之间的干扰,有效抑制在单频成像过程中出现的距离混叠效应。

Microwave Holographic Imaging Algorithm Based on Two-Frequency

To avoid the limitation of the single-frequency imaging algorithm in range resolution, a two-frequency microwave holographic imaging algorithm is presented. In this algorithm, the target is illuminated by two close frequencies rather than single frequency. The range resolution can be improved by the utilization of Gaussian phase information. The range aliasing effect appears in single-frequency imaging can also be weakened. The Matlab software is used for the performance simulation of this two-frequency imaging algorithm. Furthermore, position jitter is added in space sampling to evaluate the robustness of this algorithm with non-ideal spatial scanning factors in target imaging. The experiment is also carried out. The results verify the efficiency of the two-frequency imaging algorithm and also show that the interference between two closely placed targets can be reduced and the range aliasing effect can be weakened by using the two-frequency imaging algorithm.