Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2008, Vol. 31 ›› Issue (2): 5-9.doi: 10.13190/jbupt.200802.5.sunhy

• Papers • Previous Articles     Next Articles

Study on Temperature Compensative Technique in Microwave Radiometer Detection System

SUN Hong-yan1,2 , ZHAO Kai1   

  1. 1. Northeast Institute of Geography and Agroecology, Chinese Academy of Science, Changchun 130012, China;
    2. Graduate University , Chinese Academy of Science, Beijing 100049,China
  • Received:2007-12-22 Revised:1900-01-01 Online:2008-04-28 Published:2008-04-28
  • Contact: SUN Hong-yan

Abstract:

Aiming at nonlinearity measurement error of detection system caused by the change of the environment temperature, a new Chebyshev fitting algorithm is proposed for detection system temperature compensation. The temperature compensative technique can be validated by the post-correction output voltage curve and the correction output voltage curve showed in the same figure. The curves are gained when Square-law detector system works on the dynamic range. Utilizing soft data processing to implement the Chebyshev algorithm, not only the measurement error is decreased, but the system noise caused by the additional electron device is also eliminated. Using compensative technique in the microwave radiometer, the accuracy and linearity of such system is optimized, and the instrument is more reliable for the real-time observation on airborne or ground platform.

Key words: microwave radiometer, Square-law detector system, nonlinearity coefficient, temperature compensation, Chebyshev fitting algorithm

CLC Number: