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引用本文：

黄建.毫米波零中频全功率辐射计系统[J].电讯技术，2013，53（3）： - . [点击复制]
HUANG Jian.A zero intermediate frequency total power radiometer system in millimeter-wave band[J].，2013，53（3）： - . [点击复制]

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毫米波零中频全功率辐射计系统
黄建
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(中国西南电子技术研究所，成都 610036)

摘要:

提出了一种零中频接收的毫米波全功率辐射计系统，可降低外差式全功率辐射计系统实现的难度和成本，有利于实现系统的集成化和轻小型化。运用随机过程理论分析了全功率辐射计视频信号功率谱和温度灵敏度，在此基础上分析了零中频全功率辐射计的温度灵敏度。结果表明，在满足截止频率高于1/2视频积分滤波器带宽条件下，零中频辐射计中频通道可采用高通滤波器抑制直流漂移和低频噪声，而不会影响辐射计温度灵敏度，其理论值与射频带宽2倍于中频带宽的全功率辐射计相同。完成了一个34～40 GHz毫米波多通道零中频全功率辐射计系统的设计和研制，采用10通道一体化集成和本振空馈功率分配技术，实现了系统的集成化和小型化，测试温度灵敏度与理论值相符，表明了理论分析的正确性和设计方法的可行性。

关键词: 毫米波全功率辐射计零中频辐射计温度灵敏度

DOI：

基金项目:

A zero intermediate frequency total power radiometer system in millimeter-wave band

HUANG Jian

()

Abstract:

A zero intermediate frequency(ZeroIF) total power radiometer system architecture is proposed to reduce the realization difficulties as well as the cost of total power radiometer with common heterodyne receiver. It will also be he lpful for system integration and miniaturization. The power spectrum of video si gnal and the temperature sensitivity of total power radiator is analyzed using t heory of stochastic process. Then the temperature sensitivity of ZeroIF total power radiometer is analyzed based on the previous analysis. The results show tha t a highpass filter(HPF) to suppress DC drift and noise or clutter in low freq uency in intermediate frequency channel of ZeroIF radiometer will not affect the tem perature sensitivity if its cutoff frequency is higher than half of the bandwid th of the video integral filter.Under this condition, the sensitivity of ZeroI F radiometer is as the same of common total power radiometer with RF bandwidth twice the IF bandwidth. Finally a millimeterwave band multichannel ZeroIF total power radiometer system with 34～40 GHz operational frequency band is designed . The system is realized with the features of 10channel and local oscillation signa l airfeeding and spatial power dividing. High integration and miniaturization of the whole system is realized. The measured temperature sensitivity is accordi ng with the theoretic value well, thus the presented theory analysis as well as the design method of ZeroIF total radiometer system is validated.

Key words: millimeter wave total power radiometer zero intermediate frequency radiometer t emperature sensitivity