基于FPGA的次声波合成的电路设计

Circuit Design of Infrasound Wave Based on FPGA

次声波是频率在10^-6～20Hz的波，在生物医学、气象学、军事等领域有着广泛应用前景，此频段的信号无法通过天线直接发射：应用DDS原理产生2路相干超声波，在空间干涉产生次声波。主要完成了基于FPGA的DDS电路设计，并且完成了系统软、硬件设计，通过Max＋PlusⅡ和Matlab的仿真表明该设计的原理正确、方案可行。

The infrasound wave is a wave that frequency is between 10^-4-20 Hz,and has abroad application foreground. The signal of the frequency can not be directly transmitted passing antenna. Applying the theory of DDS produces two interferential ultrasonic waves,producing infrasound wave by interfering in the air. The article has mostly done the circuit design of DDS based on FPGA,and design of system software and hardware. The imitation of Max＋Plus Ⅱ and Matlab shows the design principle is correct and feasible.