中文摘要：

华中科技大学电磁场与微波技术中心已经设计并研制出一套工作于Ka波段的16阵元一维毫米波综合孔径辐射成像系统HUST-ASR,样机采用了最小冗余稀疏直线阵列以及先进的数字相关技术。阵列幅相误差对综合孔径辐射计成像会产生严重影响,文中提出一种不增加系统硬件复杂度、易于实现的单外部辅助源校正方法,给出在辐射计低信噪比条件下的校正算法,并进行了成像试验验证。试验结果表明,该校正方法能够有效校正毫米波综合孔径辐射计的幅相误差,经过校正后的成像系统对自然场景实现了非常清晰的毫米波综合孔径亮温图像,空间分辨率达到0.64°,证明该系统具有良好的成像性能。

英文摘要：

An 1-D（one-dimensional）16-element Ka-band millimeter wave aperture synthesis radiometer（ASR）imaging system,HUST-ASR,was developed by Center for Electromagnetic Field and Microwave Technology,Huazhong University of Science and Technology,which used minimum-redundancy thinned linear array and advanced digital correlation technology.Phase and amplitude errors of the array have great influence on the ASR imaging.In this paper,a simple and effective calibration approach that makes use of single external source in a known location and a calibration algorithm for the low SNR condition of radiometer are proposed to calibrate the errors,which is verified by imaging experiments.The experiment results,some good millimeter wave aperture synthesis brightness temperature images,show that phase and amplitude calibration are sufficiently accurate to satisfy for the millimeter wave ASR requirements,and the HUST-ASR with 0.64° spital resolution has good imaging performance.