The High-Altitude MMIC Sounding Radiometer for the Global Hawk Unmanned Aerial Vehicle: Instrument Description and Performance

The Jet Propulsion Laboratory's High-Altitude Monolithic Microwave Integrated Circuit (MMIC) Sounding Radiometer (HAMSR) is a 25-channel cross-track scanning microwave sounder with channels near the 60- and 118-GHz oxygen lines and the 183-GHz water-vapor line. It has previously participated in three hurricane field campaigns, namely, CAMEX-4 (2001), Tropical Cloud Systems and Processes (2005), and NASA African Monsoon Multidisciplinary Analyses (2006). The HAMSR instrument was recently extensively upgraded for the deployment on the Global Hawk (GH) unmanned aerial vehicle platform. One of the major upgrades is the addition of a front-end low-noise amplifier, developed by JPL, to the 183-GHz channel which reduces the noise in this channel to less than 0.1 K at the sensor resolution (~2 km). This will enable HAMSR to observe much smaller scale water-vapor features. Another major upgrade is an enhanced data system that provides onboard science processing capability and real-time data access. HAMSR has been well characterized, including passband characterization, along-scan bias characterization, and calibrated noise-performance characterization. The absolute calibration is determined in-flight and has been estimated to be better than 1.5 K from previous campaigns. In 2010, HAMSR participated in the NASA Genesis and Rapid Intensification Processes campaign on the GH to study tropical cyclone genesis and rapid intensification. HAMSR-derived products include observations of the atmospheric state through retrievals of temperature, water-vapor, and cloud-liquid-water profiles. Other products include convective intensity, precipitation content, and 3-D storm structure.

[1]  Alberto Mugnai,et al.  Precipitation profile retrievals using temperature‐sounding microwave observations , 2003 .

[2]  David H. Staelin,et al.  Precipitation observations near 54 and 183 GHz using the NOAA-15 satellite , 2000, IEEE Trans. Geosci. Remote. Sens..

[3]  James F. W. Purdom,et al.  Satellite Analysis of Tropical Cyclones Using the Advanced Microwave Sounding Unit (AMSU). , 2000 .

[4]  Shannon T. Brown,et al.  Observations of tropical cyclones with a 60, 118 and 183 GHz microwave sounder , 2007, 2007 IEEE International Geoscience and Remote Sensing Symposium.

[5]  Vahraz Jamnejad,et al.  Reflector antenna systems for the high altitude MMIC sounding radiometer (HAMSR) , 2000, 2000 IEEE Aerospace Conference. Proceedings (Cat. No.00TH8484).

[6]  P. Rosenkranz Water vapor microwave continuum absorption: A comparison of measurements and models , 1998 .

[7]  P. Bauer,et al.  Hydrometeor Retrieval Accuracy Using Microwave Window and Sounding Channel Observations , 2005 .

[8]  Terry Hock,et al.  Warm Core Structure of Hurricane Erin Diagnosed from High Altitude Dropsondes during CAMEX-4 , 2006 .

[9]  Hans J. Liebe,et al.  Propagation Modeling of Moist Air and Suspended Water/Ice Particles at Frequencies Below 1000 GHz , 1993 .

[10]  John A. Knaff,et al.  Tropical Cyclone Wind Retrievals from the Advanced Microwave Sounding Unit: Application to Surface Wind Analysis , 2006 .

[11]  W. Deal,et al.  Low noise amplifier for 180 GHz frequency band , 2008, 2008 IEEE MTT-S International Microwave Symposium Digest.

[12]  Albin J. Gasiewski,et al.  Aircraft-based Radiometric Imaging of Tropospheric Temperature and Precipitation Using the 118.75-GHz Oxygen Resonance , 1990 .

[13]  David H. Staelin,et al.  AIRS/AMSU/HSB precipitation estimates , 2003, IEEE Trans. Geosci. Remote. Sens..

[14]  Christopher S. Velden,et al.  Satellite-Based Tropical Cyclone Intensity Estimation Using the NOAA-KLM Series Advanced Microwave Sounding Unit (AMSU) , 2003 .