Implementação do algoritmo de autocorrelação em VHDL para medição de velocidade

Abstract

Determining the velocity distributions along the cross section of a river channel is of vital importance to detail the possibilities of its energy potential. Considering this, the present work implemented in VHDL a velocity estimation algorithm based on the autocorrelation method, which is established on the phase estimation for sequential pulses of a complex demodulated signal. An algorithm previously validated in MATLAB® was applied in a FPGA using a DE10-Lite kit and the IEEE 754 standard floating point with single precision. The tests were performed with real data acquired prior to this work. The autocorrelation algorithm implemented in VHDL presented a relative estimated velocity error below 0.00002%, however, due to the low error, a vast amount of resources is consumed thus making it unfeasible to be used in FPGAs with lower capacity.