Feasibility Study on Intra-Grid Location Estimation Using Power ENF Signals
Feasibility Study on Intra-Grid Location Estimation Using Power ENF Signals
复制标题
利用电力ENF信号进行网内位置估计的可行性研究
DOI：
--
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Min Wu
中科院分区：
文献类型：
--
作者：
Ravi Garg;Adi Hajj;Min Wu
电力网络频率(ENF)是配电网络的特征，可以通过在有电力活动的地区进行多媒体记录来捕获。这导致了几个基于使用ENF签名的法医应用的出现。这种应用的例子包括估计或验证媒体信号的记录时间，以及推断与媒体信号被记录的位置相关联的电网。在这篇文章中，我们开展了一项可行性研究，以检查使用嵌入的ENF轨迹来精确定位电网中信号的记录位置的可能性。在这项研究中，我们证明了使用包含强烈ENF痕迹的电力信号记录来精确定位记录的位置到特定的地理分辨率是可能的。为此，提取ENF信号的高通版本，并且证明从同一网格内的不同地理位置进行的记录中提取的两个这样的信号之间的相关性随着记录位置之间的距离增加而减小。我们利用ENF信号中的这种相关性来提出基于三边测量的定位方法，该方法在使用一些已知的记录位置作为锚位置的同时精确定位记录的未知位置。我们还讨论了需要克服的挑战，以便将这项工作扩展到在噪音较大的音频/视频记录中使用ENF痕迹，以实现如此精细的本地化目的。
The Electric Network Frequency (ENF) is a signature of power distribution networks that can be captured by multimedia recordings made in areas where there is electrical activity. This has led to an emergence of several forensic applications based on the use of the ENF signature. Examples of such applications include estimating or verifying the time-of-recording of a media signal and inferring the power grid associated with the location in which the media signal was recorded. In this paper, we carry out a feasibility study to examine the possibility of using embedded ENF traces to pinpoint the location-of-recording of a signal within a power grid. In this study, we demonstrate that it is possible to pinpoint the location-of-recording to a certain geographical resolution using power signal recordings containing strong ENF traces. To this purpose, a high-passed version of an ENF signal is extracted and it is demonstrated that the correlation between two such signals, extracted from recordings made in different geographical locations within the same grid, decreases as the distance between the recording locations increases. We harness this property of correlation in the ENF signals to propose trilateration based localization methods, which pinpoint the unknown location of a recording while using some known recording locations as anchor locations. We also discuss the challenges that need to be overcome in order to extend this work to using ENF traces in noisier audio/video recordings for such fine localization purposes.
利用电源签名进行相机取证
影响因子：
3.9
作者：
Hajj-Ahmad, Adi;Berkovich, Andrew;Wu, Min
通讯作者：
Wu, Min