arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1102.2791cs.NI
收藏

传感器网络中一种混合全局最小化精确源定位算法

A Hybrid Global Minimization Scheme for Accurate Source Localization in Sensor Networks

Hamidreza Aghasi, Hamidreza Amindavar, Alireza Aghasi

摘要:

我们认为在多径环境中的多个宽带源的定位问题,考虑到相干的衰减特性和接收信号的时间延迟。我们所提出的方法留下了空间的准确的信号衰减模型在环境中不可用的考虑模型作为一个未知的功能与合理的事先假设其功能空间。与仅利用信号衰减信息或时间延迟相比,这种方法能够增强定位性能。在本文中,定位问题被建模为一个成本函数的源位置,衰减模型参数和多径参数。为了全局执行最小化,我们提出了一个混合算法结合差分进化算法与Levenberg-Marquardt算法。除了建议的优化方案组合,支持的技术细节,如封闭形式的成本函数灵敏度矩阵提供。最后,该方法的有效性进行了检查,在几个定位场景中,考虑到环境中的噪声,多径现象,并考虑传感器不同步。

英文摘要:

We consider the localization problem of multiple wideband sources in a multi-path environment by coherently taking into account the attenuation characteristics and the time delays in the reception of the signal. Our proposed method leaves the space for unavailability of an accurate signal attenuation model in the environment by considering the model as an unknown function with reasonable prior assumptions about its functional space. Such approach is capable of enhancing the localization performance compared to only utilizing the signal attenuation information or the time delays. In this paper, the localization problem is modeled as a cost function in terms of the source locations, attenuation model parameters and the multi-path parameters. To globally perform the minimization, we propose a hybrid algorithm combining the differential evolution algorithm with the Levenberg-Marquardt algorithm. Besides the proposed combination of optimization schemes, supporting the technical details such as closed forms of cost function sensitivity matrices are provided. Finally, the validity of the proposed method is examined in several localization scenarios, taking into account the noise in the environment, the multi-path phenomenon and considering the sensors not being synchronized.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑