抄録
A robust dealiasing method was developed and evaluated that can extend unambiguous Doppler velocity limits for a pulsed Doppler weather radar with multiple pulse repetition interval (PRI).
The dealiasing method can correct a sparsely distributed velocity field with large random noise and/or large velocity gradients. The method includes areal multiple PRI dealiasing and dealiasing with spatial continuity. This method makes the simple assumption that Doppler velocities can be spatially approximated by linear polynomials of the coordinates in each small area.
The dealiasing method was evaluated using simulated data that included uniform wind, Rankine vortices, axisymmetric divergence, and wind shifts. The simulated fields also included missing data and random noise. A test with real observations was also conducted. The results show that the method can successfully dealias most folded velocities. The processing time to dealias one PPI data in the evaluation is at most a few seconds using a 2.4-GHz CPU workstation, short enough for real-time radar observations.
