The coded excitation significantly strengthens the averaged ultrasound power without increasing the peak intensity.The axial resolution can be recovered by pulse compression at the recieving end,and the signal to noise ratio(SNR)can be greatly increased.A FPGA(field programmable gate array)-based real-time chirp pulse compression system with 10MHz central frequency was designed.A FPGA controled DDS(direct digital synthesizer) was applied to generate the tapered chirp signal.This signal was then used as the excitation signal after being magnified by a RF power amplifier.The echo signal was sent back to the FPGA through an ADC and on it the pulse compression was implemented.82 μs echo-signal data can be processed up within 230 μs.An experiment was done using a chirp excitation with 10MHz center frequency,7 MHz bandwidth and 5 μs duration.The results show that the signal to noise ratio is increased by 12.8 dB with slight axial resolution loss,and the sidelobes depression reaches 30.6 dB.