摘要
数字增益自动补偿微波辐射计通过测量参考基准源相应的输出量的变化进行增益补偿,保证整机的稳定.在高灵敏度的需求下,为了克服控温电流波动对接收机的影响,采用了与机箱环境温度`相同的匹配负载作为参考源,因此参考源输出的噪声温度会随着机箱温度升高而变化,导致测量误差,需要采取环境温度变化修正方法消除此测量误差量,以保持系统的稳定.同时介绍了数字增益自动补偿微波辐射计基本原理、环境温度变化修正原理及方法,并对补偿后辐射计的稳定性进行了长期稳定性测量,实现了对大气特性的有效探测.
By measuring the output variation of reference source, the digital auto-gain compensative microwave radiometer （DAGCMR） can compensate the gain fluctuation to keep system＇ s stability. Under the high sensitivity requirement, match load having the same temperature as cabinet was used as a reference source to overcome the influence of control temperature current. Hence, noise temperature from reference source output varied with cabinet temperature, which resulted in meas- urement error. To eliminate this measurement error and keep system＇ s stability, correction technique for environment temperature change was needed. The fundament of DAGCMR, the temperature correction principle and technique were presented. In addition, long-time stability measurement for compensated radiometer was carried out. Effective detection was proved for atmospheric sounding and observing.
出处
《红外与毫米波学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第2期143-146,共4页
Journal of Infrared and Millimeter Waves
基金
国家863基金(AA630308)资助项目
关键词
数字增益自动补偿
微波辐射计
环境温度
修正方法
digital auto gain compensative
microwave radiometer
environment temperature
correction technique
