摘要
本文介绍一种利用滑动调频Z变换(CZT)实现脉冲内波束扫描的新方案。它利用了对阵元信号的顺序采样与正交采样,从而使CZT处理器前的多路预处理从前放后即可化为单路处理。在此基础上,对阵元的幅度加权及近场聚焦所需的时延补偿均在处理器前一并进行,使系统十分紧凑,巳用CCD横向滤波器及常规器件实现了该系统。亦在水池进行了试验,结果相当满意。
This paper presents a new scheme of within-pulse beamscanner using sliding Chirp-Z Transform (CZT). The serial and quadrature sampling to array elements is employed, so that the multi-channel preprocessing with a large dynamic range before CZT processor becomes a monochannel processing just after preamplffication. The amplitude weighting for elements together with the time delay compensation required for the near field focus can also be completed before the CZT processor. An experimental system has been built using CCD transversal filter and some other normal components in laboratory. The experimental results in the test tank are satisfactory.
出处
《数据采集与处理》
CSCD
1992年第4期261-266,共6页
Journal of Data Acquisition and Processing
