2023年电赛H题代码

上传者: 64919823 | 上传时间: 2024-06-04 20:36:11 | 文件大小: 11.07MB | 文件类型: ZIP
解题思路 根据流图,题目要求对两个输入信号A、B使用加法器进行求和,得到信号C,使用单片机对C信号进行分离,并输出A'、B'两个信号,难点在与两个信号同频稳定输出,A与A'频率只要相差0.1Hz就会发生相对漂移,这是很难避免的,所以我们组大多数时间也都在调整这个,通过对信号做FFT,分析信号,得到A、B信号的特征,并且使用DDS对信号进行输出3.信号分析 由于C信号是A和B两个信号叠加而来的,每个信号在频域上都有固定位置,所以对采集到的信号进行FFT变化,即可得到组成该型号的各个分信号在频域上的位置,不同频率正弦波在频域上有对应的位置,所以可以将A、B信号区分出来。 4.信号输出 使用FFT分析出A、B信号的频率之后,通过DDS对信号进行输出,由于DDS模块的输出精度远远达不到同频稳定显示的要求,所以我们将AD9833的晶振有25M换为1M,使得调整精度大大提升,但是由于晶振温漂的影响,仍然会有一点点的漂移

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