【摘要】 辐射计的性能主要取决于灵敏度、准确度和稳定度。文中给出了周期定标辐射计灵敏度、准确度和长期稳定度的分析方法,并研制了周期定标毫米波辐射计。该辐射计采用直放式接收机体制,工作频率为33~38GHz,利用有源噪声源的开和关作为高温和低温定标源。实验结果表明:该毫米波辐射计稳定度可达1.28K,准确度为1.71K。当场景测量的积分时间与高、低温定标的积分时间都为7.7m s时,灵敏度优于0.50K。更多还原

【Abstract】 The performance of the radiometer depends on sensitivity,accuracy and stability.The analysis of sensitivity,accuracy and long-time stability are presented in the paper,and a millimeter wave(MMW) radiometer with periodic calibration is designed.The MMW radiometer employs direct detection receiver with 33~38GHz working frequency.The high temperature calibration source is implemented by turning on the active noise source,and low temperature calibration source is implemented by turning off the active noise source.The experiments show that long-time stability of the radiometer is 1.28K,accuracy of the radiometer is 1.71K,sensitivity of the radiometer is better than 0.50K when integration time for scene and calibration source both are 7.7ms.更多还原