自Dicke辐射计问世以来,在高灵敏度辐射计的行列中,全功率辐射计几乎被淘汰。本文通过进一步的分析、比较和实验论证,说明了随着电子技术的发展,全功率辐射计的增益稳定性可以得到显著改善,其灵敏度可以大大提高,致使可以与Dicke辐射计相媲美。文中介绍了用于校准噪声源的一种S波段的全功率辐射计及其中频放大器的设计,并给出了该辐射计的稳定性和灵敏度记录曲线。 Since the advent of the Dicke radiometer, the full-power radiometer has almost been eliminated in the ranks of high-sensitivity radiometers. Through further analysis, comparison and experimental demonstration, this paper shows that with the development of electronic technology, full-power radiometer gain stability can be significantly improved, its sensitivity can be greatly improved, resulting in comparable with the Dicke radiometer. In this paper, an S - band full - power radiometer and its IF amplifier design for noise source calibration are introduced. The stability and sensitivity of the radiometer are also recorded.