中文摘要：

针对基阵式水下成像中声学传感器频率低、带宽窄、基阵发射阵列阵元数目多等因素造成的成像帧速率低、实时性差的问题,提出1种基于复合混沌映射的基阵式水下成像编码信号设计方法,利用变参数多级混沌系统产生的伪随机序列进行调制,从而获得正交编码发射信号。仿真及实验结果表明,所提出的方法克服了基阵阵元数量、编码长度、信号个数等因素的限制,具有抗干扰性能强、带宽增加及提高水下成像分辨率的优点,可用于任意水下基阵发射信号的优化设计。

英文摘要：

To solve the problems arising in array-based underwater imaging systems, including low frame rate and poor real-time ability of the systemdue to low frequency of acoustic sensor, narrow bandwidth and the large number of array elements used in transmitting arrays, a code design method is proposed for array-based underwater imaging systems based on compound chaotic map. The pseudo-random sequenceis used to generate the modulated orthogonal coding emission signal, which is generated by the multistage chaotic system with variable parameters. Simulation and experimental results show that the method can overcome the limitations of many factors such as the number of signals transmitted, coding length, array elements and so on It also has the ad-vantages of strong anti-interference performance and increased bandwidth and improved underwater imaging resolution There-fore, the proposed method could be applied to optimize the design of the signals transmitted in any underwater arrays.