为了提高超声内镜检测系统的成像质量，弥补由前端探头工艺性问题造成的回波小、衰减大的问题，设计了基于编码激励与脉冲压缩技术的超声内镜实时成像系统。该系统主要包括前端探头及驱动单元，数据采集、处理及存储单元，交互接口及显示单元等。为了抑制脉冲压缩的旁瓣效应，分别设计了基于匹配滤波与非匹配滤波理论的三种滤波器并仿真对比其旁瓣抑制效果，得出对于4 位Barker 码，采用失配滤波方法可以有效抑制旁瓣，其中通过尖峰滤波法压缩后主瓣宽度可达0.2 mm，峰值旁瓣水平可达-55.0 dB 的结论。最后，利用自行搭建的超声内镜成像平台对靶线样品进行环扫成像，成像速度25 f/s，图像尺寸1 024 pixels×1 024 pixels，证明了系统可行性的同时验证了以上结论的正确性。

An endoscopic ultrasound imaging system based on coded excitation and pulse compression is designed, which can improve the image quality and compensate the deficiency of small echo and high attenuation due to the underdeveloped manufacture technics of the catheter type probe. This system includes probe drive unit, data processing and cache unit, and interactive unit and display unit. In order to suppress the sidelobe caused by the pulse compression,three sidelobe suppression filters are designed. The simulation results show that, for the 4-bit Barker code, the sidelobe can be effectively suppressed by using the mismatch filtering methods. Furthermore, the mainlobe and the peak sidelobe level are able to achieve 0.2 mm and -55 dB with the spike filter method. Finally, an endoscopic ultrasound imaging experimental system was set up, using the target lines as sample, achieved the images with 1 024×1 024 image size and 25 frames per secend speed, which proved the feasibility of the system and the correctness of the above conclusions.