公开(公告)号：US20140062792A1

公开(公告)日：2014-03-06

申请号：US13692721

申请日：2012-12-03

申请人： Hans G. Schantz ,  Robert E. DePierre ,  Alfred H. Unden ,  Eric Alexander Richards

发明人： Hans G. Schantz ,  Robert E. DePierre ,  Alfred H. Unden ,  Eric Alexander Richards

IPC分类号： G01S5/02

CPC分类号： G01S5/02 ,  G01S5/0252 ,  G01S13/751 ,  G01S13/878 ,  G06Q10/087

摘要： A method of near-field electromagnetic ranging and location exploits the long-wavelength, near-field characteristics of low-frequency RF signals like those in the vicinity of the AM broadcast band. These signals are robust against scattering from small objects and only mildly perturbed by the urban landscape including building structures. They are thus amenable to an RF fingerprinting approach exploiting a coarse calibration to capture the behavior of the gradually varying signal characteristics. In embodiments, a method of near-field electromagnetic ranging and location may exploit transmit tags transmitting to an infrastructure of locator-receivers, or locator-receiver tags detecting signals from an infrastructure of fixed transmitter beacons. In still further embodiments, fixed transmitter beacons may be supplemented by uncooperative signals sources including signals-of-opportunity like AM broadcast band signals.

摘要翻译： 近场电磁测距和定位的方法利用了像AM广播频带附近那样的低频RF信号的长波长，近场特性。 这些信号对于小物体的散射是强大的，并且仅由城市景观轻微扰乱，包括建筑结构。 因此，它们适用于利用粗略校准来捕获逐渐变化的信号特征的行为的RF指纹识别方法。 在实施例中，近场电磁测距和位置的方法可以利用发送到定位器 - 接收机的基础设施的发送标签，或者检测来自固定发射机信标的基础设施的信号的定位器 - 接收机标签。 在另外的实施例中，固定发射机信标可以由包括诸如AM广播频带信号之类的机会信号的不协调信号源来补充。