Global Precipitation Measurement (GPM) Microwave Imager (GMI) pre-flight calibration performance

2012 12th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad) Pub Date : 2012-03-05 DOI:10.1109/MICRORAD.2012.6185261

David Draper, David Newell

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引用次数: 3

Abstract

The GMI calibration design incorporates unique features to limit calibration errors that have been observed with previous radiometers. The design geometrically blocks solar intrusion into the hot load, encloses the hot load in a tray with known temperature, utilizes a dual calibration system using hot load/ cold-sky views plus noise diodes, and has a proven main reflector coating technology to ensure high reflectance. Calibration performance is based on ground calibration data taken in thermal vacuum tests together with component tests and analyses. The main measurements taken to demonstrate calibration performance include thermal vacuum radiometric measurements using an external calibration system, beam pattern measurements including modeled backlobe estimates for the main beam and cold sky beams, validated thermal model predictions of hot load thermal gradient performance, and reflector coating conductance. The calibration design meets the GMI calibration uncertainty requirements.

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全球降水测量(GPM)微波成像仪(GMI)飞行前校准性能

GMI校准设计结合了独特的功能，以限制以前的辐射计所观察到的校准误差。该设计在几何上阻止太阳侵入热负载，将热负载封闭在已知温度的托盘中，采用双校准系统，使用热负载/冷天空视图和噪声二极管，并具有经过验证的主反射器涂层技术，以确保高反射率。校准性能是基于在热真空测试中获得的地面校准数据以及组件测试和分析。用于演示校准性能的主要测量包括使用外部校准系统的热真空辐射测量、光束模式测量(包括主光束和冷天光束的模型背景叶估计)、热负荷热梯度性能的验证热模型预测以及反射器涂层电导。该标定设计满足GMI标定不确定度要求。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2012 12th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)

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