正交相干检波是雷达、声纳和通信等系统中为数字信号处理提供高质量的正交信号的关键技术之一。本文研究直接对中频信号采样，并利用Bessel内插将一路中频数字信号分解成两路正交数字信号，从而实现数字正交相干检波处理，同时给出了CPLD实现方案，具有一定的工程参考价值。

The coherent quadrature detector is one of the key technologies for providing high quality quadrature signal for digital signal processing in radar, sonar, communication and other systems. In this paper, for the case of direct sampling of IF signal, how to resolve one channel of digital signal into two by Bessel interpolation to realize a quadrature coherent detector is discussed. The implementation of this method in CPLD is presented, which may have some practical value in engineering.

TN957.52