Cross-Coupling Mitigation in Polarimetric PAR via Antenna Tilt

Details

• Journal Title:
  Journal of Atmospheric and Oceanic Technology
• Personal Author:
  Ivić, Igor R.
• NOAA Program & Office:
  OAR (Oceanic and Atmospheric Research) ; CIWRO (Cooperative Institute for Severe and High-Impact Weather Research and Operations) ; NSSL (National Severe Storms Laboratory)
• Description:
  The existence of significant cross-polar antenna patterns, as well as the scan-dependent measurement biases, inherent to the polarimetric phased array radar (PPAR), are among the most important risk factors for using this technology in weather observations. The cross-polar patterns on receive induce cross coupling between returns from the two orthogonal fields causing biases in polarimetric variable estimates. Furthermore, the electromagnetic coupling in hardware may exacerbate the cross-coupling effects. To address this problem, a pulse-to-pulse phase coding in either the horizontal or vertical ports of the transmission elements has been proposed. However, it does not affect the scan-dependent system biases in PPAR estimates, which require corrections via calibration mechanisms. Further, the cross-coupling signals are proportional to the cross-polar pattern power levels, rendering mitigation effective only at steering angles where these levels are sufficiently low (e.g., approximately less than −25 dB). In that regard, any approach that augments the number of such steering angles benefits the cross-coupling mitigation effectiveness. Herein, a simple approach that has a potential to achieve this via antenna tilt is presented.
• Keywords:
  • Atmospheric Science
  • Ocean Engineering
• Source:
  Journal of Atmospheric and Oceanic Technology, 40(5), 587-604
• DOI:
  https://doi.org/10.1175/JTECH-D-22-0059.1
• ISSN:
  0739-0572 ; 1520-0426
• Format:
  PDF
• Publisher:
  American Meteorological Society
• Document Type:
  Journal Article
• Funding:
  Grant no. NA21OAR4320204
• Rights Information:
  Other
• Compliance:
  Submitted
• Download URL:
  https://repository.library.noaa.gov/view/noaa/50514/noaa_50514_DS1.pdf
• File Type:
  [PDF - 3.26 MB]
• Collection(s):
  Office of Oceanic and Atmospheric Research (OAR) ; NOAA Cooperative Institutes
• Main Document Checksum:
  urn:sha-512:2da190b2638d03c35f1b5c301917b40cee82f2266246ea6a38659f9c174d3e393abf373b471244bb0fec979d69fd994bb744589f9cf987ddeee57b0164717880