微波辐射计检测的温度补偿技术  

Temperature Compensative Technique in Microwave Radiometer Detection System

作　　者：孙鸿雁[1] 赵凯[1] 

机构地区：[1]中国科学院东北地理与农业生态研究所

出　　处：《北京邮电大学学报》2008年第2期5-9,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：国家自然科学基金项目(40275002)

摘　　要：针对微波辐射计检波系统在环境温度变化下产生的非线性测量误差,提出了使用切比雪夫拟合算法对检波系统进行补偿.从辐射计检波系统未经补偿与切比雪夫多项式拟合算法进行温度补偿后,在工作动态范围内的输出电压曲线可见,该方法不但减少了检波系统受环境温度影响所产生的误差,而且消除了硬件补偿过程中的系统噪声,进一步提高了微波辐射计的准确性和线性度,满足了微波辐射计对地、空实时性探测需求.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.

关 键 词：微波辐射计 平方率检波系统 非线性系数 温度补偿 Chebyshev拟合算法 

分 类 号：TP732.1[自动化与计算机技术—检测技术与自动化装置]