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Angular Errors in Polarimetric Radar Cross Section Calibration Using a Rotating Dihedral



Lorant A. Muth, Cathy Johnson, Donald Morales, Timothy Conn


We examine how accurately system transmit and receive parameters can be determined using a rotating dihedral as the polarimetric calibration device. We derive expressions for the errors due to misalignment in the angle of rotation of the dihedral. In addition, we obtain expressions for the bias angles α0, hv and α0, vh, where the measured cross-polarization ratio of a target vanishes. Since the theoretical cross-polarization ratio of a cylinder is 0, we can thus find the calibration bias-correction angles. We use both simulated and real data to demonstrate the robustness of this bias-angle correction technique. Expressions for the uncertainty in polarimetric system parameters are also derived.
Technical Note (NIST TN) - 1539
Report Number


angular errors, calibration, polarimetric radar cross section, rotating dihedral


Muth, L. , Johnson, C. , Morales, D. and Conn, T. (2005), Angular Errors in Polarimetric Radar Cross Section Calibration Using a Rotating Dihedral, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD (Accessed April 16, 2024)
Created March 31, 2005, Updated October 12, 2021