最近几年,许多研究人员利用基于混沌的频率调制信号应用于距离和多普勒成像,在研究中发现,基于Tent 映射的调频雷达信号性能有待进一步改善。文中提出了改进途径,对Tent 映射进行多段线性分段处理,给出了数学定义式及其 性能,如最大Lyapunov指数、宽带噪声特性、优异的自相关和图钉状的模糊函数。通过分析计算和仿真结果表明, 基于多段线性分段Tent映射混沌调频雷达信号在多径传播环境下的抗多径性能得到明显改善,在高分辨成像雷达中有良好的应用前景。

In the recent years, many researchers make use of chaos-based FM signal for range-Doppler imaging, and it is discovered that the performance of Tent RFM signal is improved further in the investigation. In this paper, the method of improved Tent RFM signal is presented, which take it into complex multi-segment system by increasing its segments, and gives the mathematical definition of the type and the performance of the algorithm, such as large Lyapunov exponent, broadband noise characteristics, good time autocorrelation and thumbtack-like ambiguity function. From the analysis and results of performance simulation, the Tent RFM signal is improved effect obviously in a multipath propagation environment, it will have a good prospect in the high-resolution imaging radar.

国家自然科学基金资助