快速中值滤波方法及其在Doppler雷达资料处理中的应用

A Technique of Fast Median Filtering and Its Application to Data Quality Control of Doppler Radar

提出了一种适用于Doppler雷达信号处理的快速中值滤波方法,与传统方法相比,它的特点是考虑了相邻中值滤波窗口内信号数据的相关性。在滤波过程中,由于该方法保留了前面滤波窗口内数据的排序信息,作为下一个滤波窗口内数据排序的参考,减少了当前滤波窗口内比较运算的次数,因此,提高了运算效率。我们将该种方法应用于Doppler雷达信号处理中,进行了3点、5点和7点中值滤波试验。结果表明,5点中值滤波较为适用于Doppler雷达信号处理,它既较好地保留了Doppler雷达信号,又有效地滤除了随机脉冲噪声。同时,由于Doppler雷达观测特点,对于雷达信号不宜进行方位中值滤波。

A technique of fast median filtering is developed which fit to control data quality of Doppler radar. Its merit is that correlative information between signals data in neighboring median filtering windows are considered. In filtering processing, since sequential information of data in prior filtering window preserved as reference of current filtering window, it reduce the number of calculating for current filtering window. So calculating efficiency is increased. Final the technique is used in quality control of Doppler radar. 3, 5 and 7 points of median filtering are tested. It is found that the median filtering of 5 points is better in quality control of Doppler radar data. Signal of Doppler radar is preserved better and noises of random pulse are eliminated effectively.