Design and Implementation of Arcsine/Arccosine Function Based on an Improved CORDIC Algorithm with Double Rotations

According to the defect of traditional CORDIC algorithm on calculating arcsine and arccosine function,an improved algorithm is proposed,which uses double rotations with a constant factor and partial direction prediction. The modeling and fixed-point simulation is implemented on MATLAB platform,while the hardware realization is done on FPGA with a pipeline structure.The speed of this IP core reaches 192 M Hz and the average error is less than 10-4.This algorithm is of better precision than traditional CORDIC on average,higher speed than linear compensation.And it costs less resource than double rotations algorithm with pipeline structure.