With this system, a varying frequency can be measured automatically in high sampling frequency, and the data are saved in a disk.
它能以较高的采样频率，对一动态变化的频率进行自动测量，并将数据存盘。
Besides, the target echo signal is often weak with strong noise, so data acquisition (DAQ) card should sustain high sampling frequency and resolution.
由于目标回波的低信杂比，需要采集卡具有较高的采样率和分辨率。
Besides, the target echo signal is often weak with strong noise, so data acquisition (DAQ) card should sustain high sampling frequency and resolution.
由于目标回波的低信杂比，需要采集卡具有较高的采样率和分辨率。
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