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本文探讨采用八个基本节拍三级控制的脉冲多卜勒信号处理系统逻辑程序设计方案。三级控制是指FFT专用信号处理机逻辑指令分功能、算法和基本节拍三个部分。结合具体工程要求,分别完成对512点和1024点的FFT运算。FFT第一层迭代和时域加权合并在一起,这样旣节省运算时间又简化了译码逻辑。为了有效地抑制地物干扰,在FFT运算之前还设计了DM TI逻辑程序,这样大大压缩了整个信号处理系统的动态范围,改善了反地物干扰性能。实践证明:本逻辑程序稳定可靠、调试容易、维修方便。按照这里讨论的逻辑程序设计的专用机硬件,已成功地应用到超视距雷达反地物干扰信号处理系统中。
This article explores the logic program design of a pulsed Doppler signal processing system using eight basic-beat three-stage controls. Three-level control refers to FFT dedicated signal processor logic instructions sub-functions, algorithms and basic beat three parts. Combined with specific engineering requirements, respectively, to complete the 512 point and 1024 point FFT computing. The FFT first-level iteration and time-domain weighting are combined, thus saving computational time and simplifying the decoding logic. In order to effectively restrain the ground object interference, DM TI logic program is also designed before FFT operation, thus greatly reducing the dynamic range of the entire signal processing system and improving anti-ground object interference performance. Practice has proved: The logic program is stable and reliable, easy to debug, easy maintenance. The dedicated machine hardware, designed in accordance with the logic procedures discussed here, has been successfully applied to OTHR anti-ground-clutter signal processing systems.