基于定点DSP的CORDIC算法研究

Study of CORDIC Algorithm Based on Fixed-DSP

高精度相位求解是飞秒激光跟踪仪中测距系统的关键,为了在定点DSP中满足相位精度的要求,研究了传统数字旋转坐标计算机(CORDIC)算法,在传统CORDIC算法反正切基的基础上提出了混合基算法.证明混合基算法的可行性,在TMS320VC5402上实现了两种算法并对两者的性能进行了比较.研究结果表明:混合基算法不仅能够在相同迭代次数的下实现与传统算法相同的精度,而且可以减少硬件开销与程序运行时间.

The solution of high precision phase is a significant procedure in distance measurement system of femtoseeond laser tracker. In order to match the requirement in precision of phase in fixed-DSP, hybrid radix algorithm was proposed on the basis of traditional coordinate rotation digital computer （CORDIC） after study on traditional CORDIC Algorithm. The feasibility of hybrid radix has been demonstrated and two different methods have been implemented on TMS320VC5402 showing that hybrid algorithm, which saves execution times and hardware spaces, can realize the same precision as traditional CORDIC algorithm.