REALIZATION OF A STANDARD RADIOMETER FOR MICROWAVE BRIGHTNESS-TEMPERATURE MEASUREMENTS TRACEABLE TO FUNDAMENTAL NOISE STANDARDS

被引：2

作者：

Gu, Dazhen ^{[1
]}

Houtz, Derek ^{[1
]}

Randa, James ^{[1
]}

Walker, David K. ^{[1
]}

机构：

[1] NIST, Boulder, CO 80305 USA

来源：

2012 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS) | 2012年

关键词：

Blackbody target; brightness temperature; illumination efficiency; microwave radiometer;

D O I：

10.1109/IGARSS.2012.6350709

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We describe and demonstrate a standard radiometer for making microwave brightness-temperature measurements that are traceable to fundamental noise standards. The standard radiometer is based on a National Institute of Standards and Technology (NIST) waveguide radiometer for 18-26.5 GHz, fitted with an antenna to measure radiated power. The fraction of the antenna pattern subtended by the radiating target is determined by anechoic-chamber measurements in which we vary the temperature of the target and measure the received power. Sample measurement results with uncertainties are presented. The typical standard uncertainty for a brightness temperature of around 340 K is about 1 K. The approach should be extendable to other waveguide bands where NIST has radiometers and standards.

引用

页码：2941 / 2944

页数：4