On differentiating ground clutter and insect echoes from Doppler weather radars using archived data
S. J. Rennie1, A. J. Illingworth1, and S. L. Dance1,21Department of Meteorlogy, University of Reading, Reading, UK 2Department of Mathematics, University of Reading, Reading, UK
Received: 23 Mar 2010 – Accepted for review: 06 Apr 2010 – Discussion started: 16 Apr 2010
Abstract. Normally wind measurements from Doppler radars rely on the presence of rain. During fine weather, insects become a potential radar target for wind measurement. However, it is difficult to separate ground clutter and insect echoes when spectral or polarimetric methods are not available. Archived reflectivity and velocity data from repeated scans provide alternative methods. The probability of detection (POD) method, which maps areas with a persistent signal as ground clutter, is ineffective when most scans also contain persistent insect echoes. We developed a clutter detection method which maps the standard deviation of velocity (SDV) over a large number of scans, and can differentiate insects and ground clutter close to the radar. Beyond the range of persistent insect echoes, the POD method more thoroughly removes ground clutter. A new, pseudo-probability clutter map was created by combining the POD and SDV maps. The new map optimised ground clutter detection without removing insect echoes.
Rennie, S. J., Illingworth, A. J., and Dance, S. L.: On differentiating ground clutter and insect echoes from Doppler weather radars using archived data, Atmos. Meas. Tech. Discuss., 3, 1843-1860, doi:10.5194/amtd-3-1843-2010, 2010.