Ground clutter is an unpredictable event which often contaminates the radar products. In order to get high-quality radar base data and post-secondary radar exported products, ground clutter must be suppressed effectively. In this paper, according to the missed alarm rate of ground clutter and the false alarm rate of meteorological echo in the old ground clutter identification algorithm, which have been assessed in ROSE (Radar Operational Software Engineering) system, we propose an improved method. The radial velocity and spectral width are simply processed before the ground clutter is identified, so that the radial velocity quality in dual PRF mode is improved, and the missed alarm rate of ground clutter is reduced. In addition, echo intensity and radial velocity processing thresholds are added to the new algorithm; The threshold of numbers changes in slope within the gate-to-gate echo intensity is adjusted, and the vertical gradient parameter of reflectivity is increased. Four hundred and thirty-two ground clutter echo and meteorological echo data have been used to analyze and compare the identification effect of the new and old algorithm. The results show that the average radial velocity of ground clutter in dual PRF mode is close to zero after processing, and the accuracy of ground clutter identification is improved by 6. 84%. The added thresholds and the improvements of the characteristic parameters also could decrease the false alarm rate of meteorological echo about 1% to 2%. However, the new ground clutter identification algorithm fails to solve the false recognition problem completely. Meteorological echo, which have no radial velocity data (especially 230 km outside) and have great change in horizontal and vertical echo intensity, is very difficult to distinguish from ground clutter. This also needs to continue to do more work in the future. In particular, we could increase the new probe measurement, such as using dual polarization radar.
WEN Hao
,
LIU Liping
,
ZHANG Yang
. Improvements of Ground Clutter Identification Algorithm for Doppler Weather Radar[J]. Plateau Meteorology, 2017
, 36(3)
: 736
-749
.
DOI: 10.7522/j.issn.1000-0534.2016.00063
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