Fully polarimetrie radiometer calibration: Determining retardation plate's characteristics

Janne Lahtinen, Martti Hallikainen

    Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

    Abstract

    This paper presents a novel method to determine the phase shift of a phase retardation plate. Primarily, the method has been developed for fully polarimetric calibration standards, which consists of a linearly polarized (tri-polarimetric) calibration standard and a retardation plate. However, the method can also be applied for the phase retardation plates for other purposes. The presented method applies a fully polarimetric radiometer as the measuring instrument and it is based on the application of both linearly polarized (tri-polarimetric) and fully polarimetric calibration data, generated by the calibration standard. In the same process, the skew angle between the coordinates of the retardation plate and antenna polarization basis is determined. In addition, a method to determine the insertion loss of the phase retardation plate is described. It is based on the difference of the brightness temperatures when measuring the cold calibration scene with and without the retardation plate in the RF path. The feasibility of the presented methods has been demonstrated using the Fully Polarimetric Radiometer (FPoR), the Fully Polarimetric Calibration Standard (FPCS), and its retardation plate of Aalto University. Good match between measurement results and theoretical predictions as well as good repeatability have been achieved in determining the parameters of the retardation plate in 11 distinct measurements over a time period of almost three years.

    Original languageEnglish
    Title of host publicationProceedings of the 14th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment, MicroRad 2016
    PublisherIEEE
    Pages175-180
    Number of pages6
    ISBN (Electronic)9781509029518
    DOIs
    Publication statusPublished - 2 Aug 2016
    MoE publication typeA4 Article in a conference publication
    EventSpecialist Meeting on Microwave Radiometry and Remote Sensing of the Environment - Espoo, Finland
    Duration: 11 Apr 201614 Apr 2016
    Conference number: 14
    http://www.microrad2016.org/

    Conference

    ConferenceSpecialist Meeting on Microwave Radiometry and Remote Sensing of the Environment
    Abbreviated titleMicroRad 2016
    CountryFinland
    CityEspoo
    Period11/04/201614/04/2016
    Internet address

    Keywords

    • fully polarimetric calibration standard
    • phase shift
    • Polarimetrie radiometer
    • retardation plate

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