Ice cloud parameters have an important influence on global climate research and weather forecast. According to the atmospheric radiation theory, THz is the best frequency band for ice cloud remote sensing. In this paper, the principle and research status of ice cloud remote sensing is analyzed. The detection capabilities of different ice cloud sounders are compared, and a THz ice cloud imager for the next generation meteorological satellite is designed. The THz ice cloud imager covers five detection frequencies of 183GHz, 243GHz, 325GHz, 448GHz and 664GHz, and uses cone scanning mode, with the spatial resolution better than 10km, noise temperature better than 3000K.
Radiometers are used in a various number of measurements applications. The output detector is the main element in the radiometer which determines its linearity and dynamic range. In this paper, the square-law detection principle of Schottky diode and multiplier is introduced. The multiplication detection module and the amplifer-filter circuits are designed. The multiplication detector takes the analog multiplier as the core, and the differential circuit is used at the signal input. The output linearity of 0.99999 is achieved in the bandwidth of 50 MHz ~ 2GHz and the dynamic range of -16dBm ~ 4dBm. Compared with the diode detector, the multiplication detector has the advantages of large effective bandwidth, wide dynamic range, high linearity and good stability.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.