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Method for passive detection of moving objects based on physical layer information

A technology of physical layer information and moving objects, which is applied in the field of wireless perception, can solve the problems of extensive research on spatial diversity, inability to detect slow moving objects, and failure to consider the diversity of object motions.

Active Publication Date: 2015-04-08
北京泰豪信息科技有限公司
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Problems solved by technology

Furthermore, the increasingly popular Multiple Input Multiple Output (MIMO) provides spatial diversity. However, spatial diversity is far from being studied as widely as frequency diversity.
Finally, many previous works did not consider the diversity of object motion, especially the variety of motion speeds, so slow-moving objects may not be detected

Method used

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  • Method for passive detection of moving objects based on physical layer information
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  • Method for passive detection of moving objects based on physical layer information

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with drawings and embodiments.

[0043] Such as Figure 9 As shown, the invention specifically includes the following four main parts:

[0044] 1. Data preprocessing.

[0045] Using a commercial network card and a fine-tuned driver of the network card, the upper layer user can obtain a set of channel frequency response information (Channel Frequency Response, CFR) containing N=3 subcarriers from each data packet, that is, CSI:

[0046] H=[H(f 1 ), H(f 2 ),..., H(f N )]

[0047] Each component represents the amplitude and phase of the corresponding subcarrier of the OFDM signal, namely:

[0048] H ( f k ) = | | H ( f k ) | | e j ...

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Abstract

The invention provides a method for passive detection of moving objects based on physical layer information. The method is used for passively detecting moving objects with different speeds. Widely deployed commercial Wi-Fi equipment is used as a carrier. In addition to the traditional CSI amplitude information, CSI phase information is utilized in the invention. The change features of amplitude and phase information of a channel physical layer are extracted by a PCA algorithm, and relatively stable change features are further obtained by making use of the multi-antenna characteristic of an MIMO system to improve the accuracy and robustness of detection. Finally, the obtained features are used as input, and whether moving objects exist in an environment is predicted in a classified way by an SVM algorithm, so as to realize passive detection of moving objects.

Description

technical field [0001] The invention belongs to the field of wireless perception and relates to a passive detection method for moving objects with different speeds. Background technique [0002] As an emerging technology, passive detection technology can be used to detect whether there is any moving entity in the monitored area without requiring the monitored object to wear any equipment. Detection technology is the core technology in many applications, such as intrusion detection, patient monitoring, elderly and child care, post-disaster search, and battlefield monitoring. In these applications, it is impossible for the surveillance subject to wear any special equipment for detection and localization. Therefore, traditional active detection techniques that require surveillance objects to wear special equipment are no longer applicable. Passive detection techniques have received more attention. With the widespread deployment of wireless networks, it becomes possible to re...

Claims

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Application Information

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IPC IPC(8): G01S7/02
CPCG01P13/00G01V3/12
Inventor 钱堃杨铮刘云浩
Owner 北京泰豪信息科技有限公司
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