ITU-R ITU Radiocommunication Sector

ITU-RR ITU Radio Regulations

IUCAF Scientific Committee on Frequency Allocations for Radio Astronomy and Space Science

IWP ice water path

JMR JASON Microwave Radiometer

LEO low Earth orbit

LI lifted index

LIGO Laser Interferometer Gravitational Wave Observatory

LISA Laser Interferometer Space Antenna

LMS Land Mobile Service

LMSS Land Mobile Satellite Service

LMT Large Millimeter Telescope

LWA Long Wavelength Array

MEMS microelectromechanical systems

MHS Microwave Humidity Sounder

MIRAS Microwave Imaging Radiometer using Aperture Synthesis

MIS Microwave Imager/Sounder

MLS Microwave Limb Sounder

MODIS Moderate Resolution Imaging Spectroradiometer

MSU microwave sounding unit

MWA Murchison Widefield Array

NAIC National Astronomy and Ionosphere Center

NASA National Aeronautics and Space Administration

NEMS Nimbus-E Microwave Spectrometer

NOAA National Oceanic and Atmospheric Administration

NPOESS National Polar-orbiting Operational Environmental Satellite System

NPRM notice of public rule making

NRAO National Radio Astronomy Observatory

NRC National Research Council

NRQZ National Radio Quiet Zone

NSF National Science Foundation

NTIA National Telecommunications and Information Administration

NWP numerical weather prediction

OOB out-of-band (emissions)

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