The reason of Doppler migration and the restraint of conventional Dopplerfilter were analyzed firstly.
分析了多普勒走动出现的原因，以及常规多普勒滤波器的限制。
2
The inherent distance ambiguity of pulse Doppler radar increases the requirement of Dopplerfilter group to the clutter-suppression ability.
脉冲多普勒雷达的固有距离模糊，增大了多普勒滤波器组对杂波抑制能力的要求。
3
This article introduces the basic principle of radar narrow band doppler filters, puts up the designing method of the hardware circuit and analyzes the filter accuracy.