NASA's Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) program.
The NASA/JPL UAVSAR is a pod-based repeat-pass polarimetric SAR that currently operates in L-band (1.2 Ghz). The AirMOSS radar replaces the L-band front-end electronics and antenna with components that operate at P-band. The major components of the P-band front-end electronics are based on AIRSAR and GeoSAR heritage, and the P-band antenna utilizes the GeoSAR P-band antenna design.
AirMOSS utilizes a passive dual-polarized array antenna based on the GeoSAR P-band antenna design to take advantage of the good polarization isolation over the bandwidth of 280 to 440 MHz.
The radar has two identical receive chains. Both the H and the V radar returns are up-converted to L-band by mixing them with the same tone from the DDS as was used on transmit. The radar return is filtered using an identical filter bank as on transmit and then enters the UAVSAR receive electronics.
The P-band radar flies on the Gulfstream-III (G-III) jet operated by JSC
In situ Ground Sensors
Each of the AirMOSS study areas is collocated with a FLUXNET meteorological tower, which also includes instrumentation to measure root-zone soil moisture (RZSM) within the tower footprint (~1 km).
For most of the AirMOSS study areas, additional ground sensor profiles will be installed to measure spatial patterns of RZSM over the modeling grid cell, at several depths ranging from 2 cm down to approximately 100 cm. Sensors at each depth will include thermisters to measure soil temperature, heated ceramic needles to measure soil matric potential, and frequency domain reflectometers to measure soil moisture content. Additionally, each sensor profile will also include a thermal IR sensor for measuring surface soil temperature and a tipping bucket rain gage to measure precipitation.
The ground sensors measurements will be archived as the L2-IGSM and L2-Precip products.
For more info, see Prof. Richard Cuenca's website.
Airborne Laboratory for Atmospheric Research (ALAR)
The Airborne Laboratory for Atmospheric Research (ALAR) platform is a light twin engine aircraft, a Beechcraft Duchess, instrumented with a GPS/INS attitude system, and a turbulence probe (BAT probe) mounted on the nose. This system enables 50Hz 3D winds, enabling its use for airborne flux measurements. The wind system has been wind-tunnel calibrated (Garman et al., 2006). The vertical wind uncertainty is +/-6cm/s. The aicraft has an all-Teflon fast sampling system to enable eddy covariance flux measurements, and fast response CO2 instrumentation. We often fly with a spectral radiometer for surface reflectance measurements. The aircraft also has a cloud water collector.
Data from ALAR will be archived as the L2-CFlux product.
For more information about ALAR, see Prof. Paul Shepson's website.