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Polarimetric L-band Multibeam Radiometer (PLMR)

The Polarimetric L-band Multibeam Radiometer (PLMR) measures both V and H polarisations using a single receiver with polarisation switch at incidence angles ±7°, ±21.5° and ±38.5° in either across-track (pushbroom) or along-track configuration. In the normal pushbroom configuration the 3dB beamwidth is 17° along-track and 14° across-track resulting in an overall 90° across track field of view. The instrument has a frequency of 1.413GHz and band width of 24MHz, with specified NEDT and an accuracy better than 1K for an integration time of 0.5s, and 1K repeatability over 4 hours.

Sensor	Polarimetric L-band Multibeam Radiometer
Center frequency (GHz)	1.413 (L-band; 21cm)
Band width (MHz)	24
Polarisation	H & V (polarimetric mode optional)
Integration time (s),	0.5
Incidence angle (°)	±7, ±21.5, ±38.5
Beam width	3dB beamwidth is 17° along track and 14° across track resulting in an overall 90° across track field of view.
Radiometric resolution (K)	< 1
Weight (kg)	46
Dimension (cm)	91.5 × 91.5 × 17.25

PLMR observations

During the AACES-1 campaign, 10 patch flights (P01 - P10) and 3 transect flights (T00 - T02) were carried out. Airborne, dual-polarized brightness temperature observations of 10 patch flights (P01 - P10) and the second transect flight (T01) are shown as an example below. All brightness temperature data can be downloaded via the Download Centre.