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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。
Huazhong University of Science and Technology Center for Electromagnetic Field and Microwave Technology has designed and developed a set of work in the Ka-band 16-element one-dimensional millimeter wave integrated aperture radiation imaging system HUST-ASR prototype using minimal redundant sparse linear array and advanced digital correlation technology. Array amplitude and phase error of synthetic aperture radiometer imaging will have a serious impact on the article proposed to increase the hardware complexity of the system is not easy to achieve a single auxiliary source correction method is given in the radiometer low signal to noise ratio correction algorithm , And conducted imaging test verification. The experimental results show that the correction method can effectively correct the amplitude and phase error of the millimeter-wave synthetic aperture radiometer, and the corrected imaging system realizes a very clear millimeter-wave synthetic aperture bright temperature image of the natural scene with a spatial resolution of 0.64 °. It is proved that the system has good imaging performance.