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SPIRA-A SCANNING POLARIMETRIC IMAGING RADIOMETER IN W-BAND

SPIRA is a polarimetric imaging radiometer at 91 GHz, intended for obtaining signatures of the brightness temperature distribution of the Earth surface in all four Stokes parameters. SPIRA will be transportable by two persons and be set up within hours. A radiometric sensitivity of less than 1 K will be achieved with a superheterodyne receiver at a bandwidth of 2 GHz, millisecond sampling time and post-measurement digital integration. The antenna has been designed with special attention paid to the minimization of measurement errors due to side lobes and cross-polarization. A scanning system makes maps in azimut and elevation, that are presented in the form of images. In this paper we present the concept as well as the current status of the SPIRA project.