当前位置: X-MOL 学术IEEE Trans. Aerosp. Electron. Sys. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Adaptive Internode Ranging for Coherent Distributed Antenna Arrays
IEEE Transactions on Aerospace and Electronic Systems ( IF 4.4 ) Pub Date : 2020-12-01 , DOI: 10.1109/taes.2020.3000000
Serge R. Mghabghab , Jeffrey A. Nanzer

An adaptive ranging technique for maintaining high-accuracy ranging between nodes in coherent distributed antenna arrays is presented. Coherent distributed antenna arrays are networks of wireless systems coordinated coherently at the level of the wavelength of the wireless signal. Enabling coherent operation between separate mobile nodes for active and passive microwave remote sensing requires accurate knowledge of the relative positions of the nodes in the array. In this article, a novel adaptive ranging technique based on the near-optimal waveform for high-accuracy ranging, a two-tone waveform, is designed and demonstrated in software-defined radio platforms representing array nodes. Ranging accuracy is dependent on both signal-to-noise ratio and the separation of the two tones in the waveform; however, in realistic environments, factors such as attenuation or antenna misalignment are not easily predicted, which can lead to degradation of the ranging measurement. Selecting one appropriate waveform for range measurements is, thus, not feasible unless the bandwidth assigned to it is always higher than required for the needed range accuracy. Rather than allocating such an unnecessarily wide bandwidth, this article presents a controller that regulates the spectral resources adaptively to meet the desired reference accuracy while minimizing the total occupied bandwidth. The controller continuously monitors the statistical parameters of the received signal, such as signal-to-noise ratio, in a perception stage and adapts the spectral characteristics of the transmitted waveform in an action stage. The adaptive action, based on a Cramer–Rao lower bound analysis, maintains the signal statistical characteristics below a specified bound to maintain high coherent gain. Experimental results demonstrate the ability to maintain ranging standard deviation of 1.5 mm (standard deviation of time delay estimates equals $10^{-11}$ s), which yields 90% or more of the possible achievable coherent gain at carrier frequencies up to 13.33 GHz.

中文翻译:

相干分布式天线阵列的自适应节点间测距

提出了一种用于在相干分布式天线阵列中的节点之间保持高精度测距的自适应测距技术。相干分布式天线阵列是在无线信号波长级别相干协调的无线系统网络。为有源和无源微波遥感启用独立移动节点之间的相干操作需要准确了解阵列中节点的相对位置。在本文中,基于用于高精度测距的近乎最佳波形(双音波形)的新型自适应测距技术在代表阵列节点的软件定义无线电平台中进行了设计和演示。测距精度取决于信噪比和波形中两个音调的分离度;然而,在现实环境中,衰减或天线未对准等因素不容易预测,这可能导致测距测量的退化。因此,为距离测量选择一种合适的波形是不可行的,除非分配给它的带宽总是高于所需距离精度所需的带宽。本文没有分配如此不必要的宽带宽,而是提出了一种控制器,该控制器可自适应地调节频谱资源以满足所需的参考精度,同时最大限度地减少总占用带宽。控制器在感知阶段持续监测接收信号的统计参数,例如信噪比,并在动作阶段调整发射波形的频谱特性。自适应动作,基于 Cramer-Rao 下界分析,将信号统计特性保持在指定界限以下,以保持高相干增益。实验结果表明能够保持 1.5 mm 的测距标准偏差(时间延迟估计的标准偏差等于 $10^{-11}$s),在高达 13.33 GHz 的载频上产生 90% 或更多可能实现的相干增益.
更新日期:2020-12-01
down
wechat
bug