The purpose of the radiometer project was to research and demonstrate the working principles of a radiometer system. The radiometer design team was composed of five members, each contributing a specific component to the final system. A radiometer system is a device that detects microwave emissions from noise producing objects [1]. These noise sources are typically objects that emit heat and the...

Abstract Previous studies showed that conical scanning radiometers greatly outperform cross-track for precipitation retrieval over ocean. This study demonstrates a novel approach to improve rates at the radiometers’ observation time by propagating retrievals time. The improved rate is weighted average of original and propagated from radiometer. include Advanced Technology Microwave Sounder (ATM...

The authors have developed a simulation system for a passive microwave radiometer using MATLAB and SIMULINK from The MathWorks, Inc. The system comprises a high-level block diagram simulation for a modern instrument, the Scanning Low Frequency Microwave Radiometer, or SLFMR. The hardware prototype SLFMR, which was designed to map sea surface salinity, was implemented using the classic pulsed no...

Snowfall signatures over ocean are analyzed using satellite and airborne microwave radiometer measurements at frequencies ranging from 37 to 340 GHz. Data used in the analysis include satellite data from the Advanced Microwave Scanning Radiometer – EOS and the Advanced Microwave Sounding Unit – B, and airborne data from a millimeter-wave radiometer and a dual-frequency precipitation radar durin...

During a field campaign covering the 2002 corn growing season, a dual polarized tower mounted L-band (1.4 GHz) radiometer (LRAD) provided brightness temperature (T(B)) measurements at preset intervals, incidence and azimuth angles. These radiometer measurements were supported by an extensive characterization of land surface variables including soil moisture, soil temperature, vegetation biomass...

Three component technologies were combined into a digital correlation microwave radiometer. The radiometer comprises a dual-channel X-band superheterodyne receiver, lowpower high-speed cross-correlator (HSCC), three-level ADCs, and a correlated noise source (CNS). The HSCC dissipates 10 mW and operates at 500 MHz clock speed. The ADCs are implemented using ECL components and dissipate more powe...

We have developed an ultra-low noise 94 GHz MMIC amplifier using InGaAsfInAlAsfInP transistor technology. The MMIC designs incorporate a single transistor stage with input and output matching networks as well as gate and drain bias networks. Two MMICs have been incorporated into a single housing providing 10 dB of gain. At room temperature, the integrated amplifier has a measured noise of 365 K...

AbstracCThrce component technologies were combined into a digital correlation microwave radiometer. The radiometer comprises a duakhannel X-band superbetemdyne receiver, lowpower high-speed crosscornlator (HSCC), threelevel ADCs, and a correlated noise source (43s). The HSCC dissipates 10 mW and operates at 500 MHz clock specd. The ADCs are implemented using ECL components and dissipate more po...

First-principle analysis of the functional design of a well-collimated radiometer (WCR) reveals that in general, this instrument does not record the instantaneous directional flow of electromagnetic energy. Only in special cases can a sequence of measurements with a WCR yield the magnitude and direction of the local time-averaged Poynting vector. Our analysis demonstrates that it is imperative ...