Research On Circular Array Optimization In Performance Of Interferometric Synthetic Aperture Radiometers

Synthetic aperture microwave radiometer(ASR) has been widely used in passive detection of remote sensing, satellite, terminal guidance in missile platform, etc, which is a high sensitivity receiver designed for measuring microwave electromagnetic radiation. Compared with the real aperture radiometer, ASR's spatial resolution is greatly improved by employing aperture synthesis technology in radio astronomy and using two spatially separated antennas to get the brightness temperature distribution. However, the antenna array of two-dimensional ASR(T, U, Y array, etc) may exist a number of array redundancy, which should be avoided in antenna configuration. However, the position of antennas in a uniform circular(UCA) is a good way to improve these problems, which if sampling non-uniformly. Within this context, the present work will be conducted to improve the performance of the radiometer system based in UCA of synthetic aperture radiometer antenna array optimization method research.Firstly, the impact of antenna array configuration in performance of SAR system is analyzed. Compared with different array configuration(T, U, Y array, etc), the key performance of the UCA array system is distinct. Then, the optimization theory of antenna array is introduced. From the analysis of optimization objective function and optimization algorithm, this article select the minimum redundancy principle based on UCA baseline and UV uniform sampling coverage as mathematical theory for optimizing model. A novel UCA-SA algorithm optimization model and revised-optimizing objective function model is put forward. Then get a circular array configuration of the optimized structure. Finally, the image quality of optimal array is simulated between ideal point source and extended thermal source. The NMSE and PSNR of image evaluation are innovatively brought in this paper. The results show that the new algorithm can achieve better system performance, which theoretically supported the development and application of two-dimensional synthetic aperture microwave radiometer in circular array optimization design.