Adaptive processing for beamforming with coherent interference using uniform circular arrays

The paper deals with the problem of adaptive array beamforming using a uniform circular array (UCA) in the presence of coherent interference. The well-known scheme of spatial smoothing (SS) widely used to tackle the coherent problem in the cases of 1-D uniform linear array (ULA) and uniform rectangular array (URA) cannot work for the UCA case. This is mainly due to the fact that the direction vector of each signal received by a UCA does not possess a Vandermonde structure. In this paper, we present a method based on subarray beamforming in conjunction with an averaging scheme to effectively mitigate the effect due to coherent interference in the UCA case. Theoretical analysis regarding the validity of the proposed method is also presented. Several simulation examples are provided for showing the effectiveness of the proposed method.     

基于Qt的Android应用程序C/C++开发方法与实践

Android Java应用程序（APP）运行时需依赖Dalvik虚拟机环境,从而影响APP的性能表现.C/C++程序具有极好的硬件适应能力,但不能直接开发Android APP.针对该问题,利用Dalvik虚拟机支持JNI （Java Native Inter-face）调用的特点,设计了基于Qt的Android APP C/C++开发方法框架体系,给出了框架的详细工作机制和解决方案,系统总结了利用C/C++开发Android APP的主要过程和步骤.最后,以Android版机械CAD导教APP的开发工作为例,验证了方法的有效性和可行性,为直接利用C/C++开发Android APP提供了一种新途径.