• Besson, L., and Parent du Châtelet J. , 2013: Solutions for improving the radar refractivity measurement by taking operational constraints into account. J. Atmos. Oceanic Technol., 30, 17301742, doi:10.1175/JTECH-D-12-00167.1.

    • Search Google Scholar
    • Export Citation
  • Chandrasekar, V., and Keeler R. J. , 1993: Antenna pattern analysis and measurements for multiparameter radars. J. Atmos. Oceanic Technol., 10, 674683, doi:10.1175/1520-0426(1993)010<0674:APAAMF>2.0.CO;2.

    • Search Google Scholar
    • Export Citation
  • Doviak, R. J., and Zrnić D. S. , 1993: Doppler Radar and Weather Observations. 2nd ed. Dover Publications, 562 pp., doi:10.1016/B978-0-12-221422-6.50007-3.

  • Fabry, F., Frush C. , Zawadzki I. , and Kilambi A. , 1997: On the extraction of near-surface index of refraction using radar phase measurements from ground targets. J. Atmos. Oceanic Technol., 14, 978987, doi:10.1175/1520-0426(1997)014<0978:OTEONS>2.0.CO;2.

    • Search Google Scholar
    • Export Citation
  • Friedrich, K., Germann U. , and Tabary P. , 2009: Influence of ground clutter contamination on polarimetric radar parameters. J. Atmos. Oceanic Technol., 26, 251269, doi:10.1175/2008JTECHA1092.1.

    • Search Google Scholar
    • Export Citation
  • Hubbert, J. C., Ellis S. M. , Dixon M. , and Meymaris G. , 2010: Modeling, error analysis, and evaluation of dual-polarization variables obtained from simultaneous horizontal and vertical polarization transmit radar. Part I: Modeling and antenna errors. J. Atmos. Oceanic Technol., 27, 15831598, doi:10.1175/2010JTECHA1336.1.

    • Search Google Scholar
    • Export Citation
  • Moisseev, D., Keränen R. , Puhakka P. , Salmivaara J. , and Leskinen M. , 2010: Analysis of dual-polarization antenna performance and its effect on QPE. Proc. Sixth European Conf. on Radar Meteorology and Hydrology (ERAD 2010), Sibiu, Romania, National Meteorological Administration, P2.5. [Available online at http://www.vaisala.com/Vaisala%20Documents/Scientific%20papers/05_ERAD2010_0247_extended.pdf.]

  • Mudukutore, A., Chandrasekar V. , and Mueller E. A. , 1995: The differential phase pattern of the CSU CHILL radar antenna. J. Atmos. Oceanic Technol., 12, 11201123, doi:10.1175/1520-0426(1995)012<1120:TDPPOT>2.0.CO;2.

    • Search Google Scholar
    • Export Citation
  • Myagkov, A., Seifert P. , Wandinger U. , Bauer-Pfundstein M. , and Matrosov S. Y. , 2015: Effects of antenna patterns on cloud radar polarimetric measurements. J. Atmos. Oceanic Technol., 32, 18131828, doi:10.1175/JTECH-D-15-0045.1.

    • Search Google Scholar
    • Export Citation
  • Rinehart, R. E., 1991: Spurious velocities in Doppler radar data caused by a moving antenna feedhorn. J. Atmos. Oceanic Technol., 8, 733745, doi:10.1175/1520-0426(1991)008<0733:SVIDRD>2.0.CO;2.

    • Search Google Scholar
    • Export Citation
  • Rinehart, R. E., and Tuttle J. D. , 1981: A technique for determining antenna beam patterns using a ground target. Preprints, 20th Conf. on Radar Meteorology, Boston, MA, Amer. Meteor. Soc., 672–675.

All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 9 9 9
PDF Downloads 3 3 3

The Imperfect Phase Pattern of Real Parabolic Radar Antenna and Data Quality

View More View Less
  • 1 Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec, Canada
Restricted access

Abstract

Although antennas have well-known power patterns that are commonly used to understand the quality of measurements, they also have phase patterns that are difficult to obtain and are seldom discussed in the radar meteorological community. This study presents the characteristics of the antenna phase pattern of the McGill S-band radar. Phase variations in azimuth and elevation with respect to the main beam axis are obtained using high-resolution scans of an isolated ground target and of an emission source. The two-way phase pattern is relatively constant within the radar main beam, but it changes rapidly at the power minima between the main beam and the first sidelobe. The effects of this phase pattern on ground and weather targets were evaluated and were found to be much more pronounced for point targets than for distributed targets. Nevertheless, proper knowledge of the phase pattern of the radar antenna would enhance the ability to better select ground targets for radar refractivity retrieval and to estimate the quality of radar data.

Corresponding author address: Ya-Chien Feng, Dept. of Atmospheric and Oceanic Sciences, McGill University, 805 Sherbrooke St. W., Montreal QC H3A 0B9, Canada. E-mail: ya-chien.feng@mail.mcgill.ca

Abstract

Although antennas have well-known power patterns that are commonly used to understand the quality of measurements, they also have phase patterns that are difficult to obtain and are seldom discussed in the radar meteorological community. This study presents the characteristics of the antenna phase pattern of the McGill S-band radar. Phase variations in azimuth and elevation with respect to the main beam axis are obtained using high-resolution scans of an isolated ground target and of an emission source. The two-way phase pattern is relatively constant within the radar main beam, but it changes rapidly at the power minima between the main beam and the first sidelobe. The effects of this phase pattern on ground and weather targets were evaluated and were found to be much more pronounced for point targets than for distributed targets. Nevertheless, proper knowledge of the phase pattern of the radar antenna would enhance the ability to better select ground targets for radar refractivity retrieval and to estimate the quality of radar data.

Corresponding author address: Ya-Chien Feng, Dept. of Atmospheric and Oceanic Sciences, McGill University, 805 Sherbrooke St. W., Montreal QC H3A 0B9, Canada. E-mail: ya-chien.feng@mail.mcgill.ca
Save