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为了用声波对海底天然气渗漏流量进行原位测量,需要一个具备基本波、跳频波和脉冲串输出功能的信号源。根据声波测量的要求,提出了一种基于FPGA和专用DDS芯片AD9850的设计方案,通过并口通信,FPGA接收上位机发送的控制指令,经解码后得到工作模式、相位、频率等指令数据,根据关键位中的信息,触发AD9850和信号输出控制电路,得到所需类型的信号。测试结果表明,输出信号精度和稳定度达到预期指标,适合于海底渗漏气体原位测量的声波信号。
To use in-situ measurements of submarine gas seepage flow with acoustic waves, a signal source with basic, hopping, and burst output is required. According to the requirements of sonic measurement, a design scheme based on FPGA and AD9850, a dedicated DDS chip, is proposed. Through parallel port communication, FPGA receives the control instructions sent by the host computer and gets the instruction data such as working mode, phase and frequency after decoding. According to the key The information in the bits triggers the AD9850 and the signal output control circuit to get the desired type of signal. The test results show that the accuracy and stability of the output signal reach the expected target, which is suitable for the acoustic signal of in-situ measurement of seafloor seepage gas.