FPGA Implementation of Ultrasonic S-Scan Coordinate Conversion Based on Radix-4 CORDIC Algorithm

Abstract

To solve the existing problems on traditional method of calling function at ultrasonic S-scan coordinate conversion, this paper introduced the FPGA implementation of ultrasonic S-scan coordinate conversion based on Radix-4 CORDIC algorithm. On the analysis of the Radix-4 Rotation CORDIC algorithm, we selected 7-level pipeline structure on FPGA, used the preprocessing technique to solve the non-constant problem of scale factor. The simulation results show that the maximum error of Radix-4 Rotation CORDIC algorithm is 1.5×10 -3 and the computing latency is only 7T at 16 bit data-width under 100MHz FPGA. The scan conversion rate speed up at least 10 times, and the output effect of the image is basically the same as the traditional method. The algorithm has the characteristics of low latency, high speed and high precision, suitable for real-time signal processing applications.