一种非均匀采样的宽带雷达数字正交解调方法

数字正交解调是宽带雷达数字接收机的重要组成部分,灵活性和实时性是数字正交解调设计的关键问题。从二阶采样和多相滤波的原理出发,提出了基于非均匀采样的数字正交解调方法,给出了算法的实现结构,并通过仿真验证了算法的正确性。通过与低通滤波法、多相滤波法比较结果表明,基于非均匀采样的数字正交解调方法具有优化的实现结构和更好的实时性,可以用于宽带雷达数字接收机的设计。

Digital Quadrature Demodulation of Wideband Radar Based on Nonuniform-sampling

Flexibility and simplicity are key points in designing a digital quadrature demodulator, which is an important part of wideband radar digital receiver. In this paper, we proposed a new implementation of digital quadrature demodulation based on nonuniform-sampling, which is evolved from second-order sampling and multiphase filter. The structure of nonuniform-sampling was presented, and its effectiveness was verified by simulation results. Compared with low-pass filter and multiphase filter, nonuniform-sampling obtains more optimized structure and better performance in real-time processing. This novel approach will offer potential for better resolution in designing a wideband radar digital receiver.