多普勒速度模糊的切向消除技术

根据多普勒速度模糊在速度随方位角分布廓线（切向廓线）上的特征，提出了切向消除速度模糊的技术。其主要步骤是：1.通过消除切向廓线上的孤立点将切向廓线分为缺测段，模糊段和非模糊段；2.按速度切向分布的连续性逐段进行模糊判别和修正；3.以切向廓线的拟合简谐曲线为参照，消除廓线上的模糊点；4.在各距离段内按速度径向分布的连续性进行模糊判别和修正。文中还提出了用切向廓线的拟合简谐曲线的振幅与速度绝对值的平均值之比值的大小来检验速度模糊是否已被消除。

A Technique of Tangential Remove for Doppler Velocity Ambiguity

According to the characteristics of the ambiguous doppler velocity in the velocity-azimuth profile,a technique of tangential remove for ambiguous velocities is proposed inthe paper.The process of removing the ambiguous velocities contains four major steps:1.Dividing the velocity-azimuth profile into zero segment (data gap),unambiguoussegment,and ambiguous segment by removing the isolated points on the profile;2.Using the unambiguous segment with opposite signs at two ends as reference todetermine the ambiguous segments and using the continuity of velocity distribution toremove the ambiguous velocity segments on the profile;3.Using the simulated harmonic curve of profile as reference to determine and re-move the ambiguous points on the profile;4.Using one of the ambiguous velocity removed profile in a distance range as refer-ence to remove ambiguous velocity according to the radial continuity of velocity distribu-tion.The ratio of the amplititude of simulated harmonic curve of profile to the average ofthe absolute value of Doppler velocity is used to check whether the ambiguous velocitiesare removed on a velocity-azimuth profile.