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In order to improve the accuracy and bias of real-time signal acquisition, a real-time signal acquisition system based on DSP+FPGA is proposed. The system adopts 4 transducer array to build parallel array signal acquisition unit, the original signal acquisition amplification filtering through analog signal pretreatment, using TMS32010DSP chip as the core of signal processor chip to realize real-time signal acquisition and processing, including the signal spectrum analysis and target information simulation, controlled by DSP D/A converter DAC, through the realization of FPGA data storage, real-time display on the PC and DSP sampling data processing results. The performance of the system is tested by simulation. The results show that the signal acquisition system can effectively realize the real-time signal acquisition and processing, the anti-interference ability is strong.