Signal processing solution of laser Doppler velocimeter based on FPGA

Signal processing solution of laser Doppler velocimetry in the high dynamic environment based on FPGA (field programmable gate array) was proposed. The whole signal processing was finished by FPGA. The signal spectrum was acquired by the FFT (Fast Fourier Transform) algorithm and was adjusted by the energy centrobaric correction method. Adaptive algorithm of sampling frequency was proposed to balance the measurement accuracy with measurement range; finally, the result through a universal serial bus (USB) was uploaded to a personal computer (PC).Pipelined architecture was used to improve the speed of signal processing. Experimental results showed that the data updating rate reached 2.4 - 24 kHz, the data delay reached 123 - 1230 s, the accuracy was better than 810-4 and the stability was better than 2.510-7.