Detection and Mitigation of Second-Trip Echo in Polarimetric Weather Radar Employing Random Phase Coding

This study presents a new identification and mitigation scheme of second trip contamination for pulsed Doppler polarimetric weather radars with the ability of random phase coding. This scheme can be easily implemented in a magnetron radar without any hardware changes. For relatively weak contamination, identification and mitigation are based on a multilag processing method, which uses multiple lags of both the auto- and cross-correlation functions to estimate radar moments. For relatively strong contamination, instantaneous phase variations of horizontal and vertical polarization channels are combined into a simple fuzzy-logic scheme to complete the identification. Data from the C-band OU-PRIME radar are used to demonstrate the effectiveness of the proposed scheme for identification and mitigation of second-trip echoes.

[1]  Pravas Mahapatra,et al.  Two Methods of Ambiguity Resolution in Pulse Doppler Weather Radars , 1985, IEEE Transactions on Aerospace and Electronic Systems.

[2]  Sebastián M. Torres,et al.  Alternating Dual-Pulse, Dual-Frequency Techniques for Range and Velocity Ambiguity Mitigation on Weather Radars , 2010 .

[3]  Guifu Zhang,et al.  Spaced-Antenna Interferometry to Measure Crossbeam Wind, Shear, and Turbulence: Theory and Formulation , 2007 .

[4]  Alexander V. Ryzhkov,et al.  Correlation Coefficients between Horizontally and Vertically Polarized Returns from Ground Clutter , 2006 .

[5]  Asko Huuskonen,et al.  A Proposed Solution to the Range–Doppler Dilemma of Weather Radar Measurements by Using the SMPRF Codes, Practical Results, and a Comparison with Operational Measurements , 2005 .

[6]  Alexander V. Ryzhkov,et al.  Observations of the 10 May 2010 Tornado Outbreak Using OU-PRIME: Potential for New Science with High-Resolution Polarimetric Radar , 2011 .

[7]  Sebastián M. Torres,et al.  Range and velocity ambiguity mitigation on the US NEXRAD network: performance and improvements of the SZ-2 phase coding algorithm , 2008 .

[8]  D. S. Zrnic,et al.  Unambiguous Range Extension by Overlay Resolution in Staggered PRT Technique , 2003 .

[9]  J. B. Mead,et al.  Polarization Diversity Pulse-Pair Technique for Millimeter-WaveDoppler Radar Measurements of Severe Storm Features , 1999 .

[10]  Dusan S. Zrnic,et al.  Systematic Phase Codes for Resolving Range Overlaid Signals in a Doppler Weather Radar , 1999 .

[11]  John Y. N. Cho.  Multi-PRI Signal Processing for the Terminal Doppler Weather Radar. Part II: Range–Velocity Ambiguity Mitigation , 2005 .

[12]  V. Chandrasekar,et al.  Evaluation of the Simultaneous Multiple Pulse Repetition Frequency Algorithm for Weather Radar , 2008 .

[13]  Sebastián M. Torres,et al.  Design, Implementation, and Demonstration of a Staggered PRT Algorithm for the WSR-88D , 2004 .

[14]  Mark Pinsky,et al.  Application of a Simple Adaptive Estimator for an Atmospheric Doppler Radar , 2011, IEEE Transactions on Geoscience and Remote Sensing.

[15]  Guifu Zhang,et al.  Performance of correlation estimators for spaced‐antenna wind measurement in the presence of noise , 2004 .

[16]  Lei Lei,et al.  A multi-lag correlation estimator for polarimetric radar variables in the presence of noise , 2009 .

[17]  J. Kong,et al.  Scattering of Electromagnetic Waves: Theories and Applications , 2000 .

[18]  Nitin Bharadwaj,et al.  Phase Coding for Range Ambiguity Mitigation in Dual-Polarized Doppler Weather Radars , 2007 .

[19]  V. Chandrasekar,et al.  Polarimetric Doppler Weather Radar: Principles and Applications , 2001 .

[20]  Valery M. Melnikov,et al.  Autocorrelation and Cross-Correlation Estimators of Polarimetric Variables , 2007 .

[21]  Pierre Tabary,et al.  Design and test of an operational triple-PRT Doppler scheme for the French radar network , 2005 .

[22]  Sebastián M. Torres,et al.  Pseudowhitening of weather Radar signals to improve spectral moment and polarimetric variable estimates at low signal-to-noise ratios , 2004, IEEE Transactions on Geoscience and Remote Sensing.

[23]  M. Sachidananda,et al.  Recovery of Spectral Moments from Overlaid Echoes in a Doppler Weather Radar , 1986, IEEE Transactions on Geoscience and Remote Sensing.

[24]  D. Zrnic,et al.  Doppler Radar and Weather Observations , 1984 .