Abstract

The results of the development of a mobile solid-state microwave spectroradiometer that operates in the 5-mm absorption band of molecular oxygen are presented. The spectroradiometer consists of a superheterodyne receiver with a low-noise input amplifier and an eight-channel spectrum analyzer. The noise temperature of the device is 1000–1300 K. A solid-state modulator–calibrator based on Schottky-barrier GaAs diodes is used to provide the automatic internal intensity calibration of received radio emission. The design of the spectroradiometer antenna system is a Teflon lens with an antireflection coating and a conical corrugated horn. The instrument is equipped with an automated digital system for controlling the measurement, calibration, and a data preprocessing procedure. Examples of the measurement results of the atmospheric emission spectra and the radiative characteristics of the earth’s surface that were obtained with this instrument are presented. The spectroradiometer is designed for remote studies of the atmosphere and the underlying surface.

中文翻译：

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5毫米波长范围光谱仪，用于研究大气和下垫面

摘要

介绍了在分子氧的5 mm吸收带中工作的移动式固态微波光谱仪的开发结果。光谱辐射仪由一个带有低噪声输入放大器的超外差接收器和一个八通道频谱分析仪组成。该设备的噪声温度为1000–1300K。基于肖特基势垒GaAs二极管的固态调制器–校准器用于提供接收到的无线电发射的自动内部强度校准。分光辐射计天线系统的设计是带有防反射涂层和锥形波纹形喇叭的特氟龙透镜。该仪器配备有用于控制测量，校准和数据预处理程序的自动化数字系统。给出了使用该仪器获得的大气发射光谱和地球表面辐射特性的测量结果的示例。分光辐射计设计用于远程研究大气和下层表面。