As Doppler shift signal can significantly reflect the speed of flow, the abstracting of Doppler shift signal is the key of blood flow speed testing in a ultrasonic blood flow detector.

超声血流仪实现其测量血流速度的关键是多普勒频移信号的提取，多普勒频移信号是血流速度的真实反映。

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So, it's very important to research capacitance proximity fuze. This paper researched the main systems of capacitance proximity fuze including detector, signal processor and simulation-testing system.

本论文对电容近炸引信的几个主要系统进行了较为详细的研究，其中包括对探测器、信号处理器和仿真测试系统等的研究。

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