星载微波成像仪接收通道的仿真研究

星载微波成像仪接收通道即微波辐射计,是星载微波成像仪的核心部分。对其进行仿真研究的关键和基础是信号处理方法。给出了接收通道各环节的数学模型;采用快速离散富里叶变换处理信号;分析并缓解了由于离散富里叶变换带来的频率分辨率与样本点数之间的矛盾;以全功率微波辐射计为例进行了仿真研究并给出了结果。为进一步实现系统仿真调试和环境仿真调试奠定了基础,并为其它类型微波辐射计的仿真研究提供了借鉴。

Simulative Study of Received Channel About Space-borne Microwave Imaging Instrument

The received channel about spaceborne microwave imaging instrument,a microwave radiometer,is the kernel section of space borne microwave imaging instrument.The key and foundation of simulative study is the method of signal processing.The mathematical model of every section is given.The mathematical means of discrete Fast Fourier Transform is used in signal processing.The contradiction of frequency resolving power and the number samples by discrete Fourier Transform is analyzed and relieved.To take the total power microwave radiometer for example the simulative study has been done and the result is given.These lay a foundation for the advancement of realizing system and environment debugging.Also these give a reference to the simulative study of other type of microwave radiometers.