可是，对于载波频率不断变化的CW脉冲信号，普通的滤波器难以实现窄带跟踪滤波，而宽带滤波又不能达到提高信噪比的要求。
But to the CW pulse signal with changing carrier wave frequency, common filter cannot achieve narrowband filter, whereas broadband filter cannot reach the request of the signal-noise ratio.
分析了该光电传感器的工作原理及信号特点，设计了适合处理该信号的窄带通跟踪滤波器。
The principle and characteristic of the signal generated lay the sensor is analyzed. The narrow pass band following up filter, which fits to regulate the signal, is designed.
PLL具有良好的窄带和跟踪特性，文中提出了基于PLL的窄带滤波器杂散抑制方法。
For the PLL has better performances in narrowband filtering and frequency tracking, the paper presents a new method which based on PLL accomplish the spuriousness restrained.
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