An Objective Prototype-Based Method for Dual-Polarization Radar Clutter Identification

Atmosphere

Alain Protat¹  Hui Xiao²  Guang Wen² 

[1] Australian Bureau of Meteorology, Melbourne, VIC 3008, Australia;LACS, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;

关键词: prototype-based method;    clutter identification;    dual-polarization radar;   

DOI  :  10.3390/atmos8040072

来源: DOAJ

【 摘 要 】

A prototype-based method is developed to discriminate different types of clutter (ground clutter, sea clutter, and insects) from weather echoes using polarimetric measurements and their textures. This method employs a clustering algorithm to generate data groups from the training dataset, each of which is modeled as a weighted Gaussian distribution called a “prototype.” Two classification algorithms are proposed based on the prototypes, namely maximum prototype likelihood classifier (MPLC) and Bayesian classifier (BC). In the MPLC, the probability of a data point with respect to each prototype is estimated to retrieve the final class label under the maximum likelihood criterion. The BC models the probability density function as a Gaussian mixture composed by the prototypes. The class label is obtained under the maximum a posterior criterion. The two algorithms are applied to S-band dual-polarization CP-2 weather radar data in Southeast Queensland, Australia. The classification results for the test dataset are compared with the NCAR fuzzy-logic particle identification algorithm. Generally good agreement is found for weather echo and ground clutter; however, the confusion matrix indicates that the techniques tend to differ from each other on the recognition of insects.

【 授权许可】

Unknown