基于CORDIC算法的线性调频直接数字合成实现

本文介绍了一种应用CORDIC算法的线性调频直接数字合成(DDS)的实现方法。由于DDS输出的余弦波形直接由极坐标系中的幅度值和角度值确定,而CORDIC算法将极坐标系直接转换为包含正、余弦值的直角坐标系,从而实现频率数字调制。通过计算机仿真和FPGA硬件实现表明,采用这种算法的DDS是高精度和高效的。

A CORDIC-Based LFM Implementation in Direct Digital Synthesizing

A new method LFM in direct digital frequency synthesizing ( DDS) based on CORDIC algorithm is introduced in this paper. The sine/cosine wave from the output of DDS is defined by the amplitude and angle in polar coordinate, and the CORDIC algorithm can directly convert the polar coordinate to Cartesian coordinate that contents the information of sine/cosine value,the digital frequency modulation is thus implemented in this way. It' s indicated that this algorithm is highly accuracy and efficiency to implement DDS though the computer simulation results and FPGA hardware implementation.