基于漏波天线的分布式微波辐射计

Distributed microwave radiometer based on leaky wave antenna

为了缓解传统实孔径微波辐射计中性能指标与体积、重量间的矛盾,解决综合孔径微波辐射计中高空间分辨率以系统结构、信号处理复杂度高为代价的难题,提出了一种基于漏波天线的分布式微波辐射计系统。首先,介绍了系统总体方案,包括漏波天线和接收机方案;其次,详细分析了系统的关键指标——角分辨率和系统灵敏度,并介绍了定标方案;最后,对系统进行建模并仿真分析。结果表明,所设计的系统结构简单、复杂度较低、信号处理简单;通过对系统进行建模仿真,反演出的亮温值和真实亮温值误差很小。该系统可以作为一种新型的微波辐射计系统重点发展。

In order to alleviate the contradiction between the performance and the volume and weight of the traditional real aperture microwave radiometer,and also to solve the problem that high spatial resolution is at the lost of systematic structure and signal processing complexity in the synthetic aperture microwave radiometer,a distributed microwave radiometer system is proposed based on the leaky wave antenna.First,the scheme about the system is introduced,including the leaky wave antenna and the receiver scheme.Second,the key specifications of the system such as angular resolution and system sensitivity are analyzed in detail,and the calibration scheme is also introduced.Finally,the system proposed is examined through modeling and simulation analysis.The results show that the system has a simple structure,a low complexity,and a simple signal processing,and the errors between the brightness temperature and the real brightness temperature prove to be very small through modeling and simulation analysis.In conclusion,the system has a potential to be developed as a new type of microwave radiometer system.