Aydin N, Evans D H
Division of Medical Physics, Faculty of Medicine, Leicester University, UK.
Med Biol Eng Comput. 1994 Jul;32(4 Suppl):S157-64. doi: 10.1007/BF02523342.
Three methods of deriving directional signals from phase quadrature Doppler signals, using digital techniques, are described. These are the phasing-filter technique, the Weaver receiver technique and the complex FFT. The basic theory behind the three methods is presented, together with the results of digital simulations. Each of the methods has been implemented in real time using a commercially available digital signal-processing board, and their relative processing times are compared. All the methods work well, and the decision to implement one or other in a specific application is likely to rest on secondary factors, such as the need to tape-record the time domain output.
本文描述了三种使用数字技术从正交相位多普勒信号中获取方向信号的方法。它们分别是相位滤波技术、韦弗接收机技术和复数快速傅里叶变换（FFT）。文中介绍了这三种方法背后的基本理论以及数字模拟结果。每种方法都已使用市售数字信号处理板实时实现，并比较了它们的相对处理时间。所有方法都运行良好，在特定应用中选择使用其中一种方法可能取决于诸如是否需要录制时域输出等次要因素。
