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Indoor intrusion and spatial structure change identification method based on wireless signal characteristic

A spatial structure and wireless signal technology, applied in the direction of instruments, anti-theft alarms, alarms, etc., can solve the problem of intrusion fingerprint database mismatch

Active Publication Date: 2019-09-24
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The present invention solves the problem that the intrusion fingerprint database does not match due to the change of the indoor space structure in the intrusion detection method based on the fingerprint database, and provides an indoor intrusion and spatial structure change identification method based on RSS signal feature analysis

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  • Indoor intrusion and spatial structure change identification method based on wireless signal characteristic

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[0038] specific implementation plan

[0039] The present invention will be further described below in conjunction with accompanying drawing:

[0040] like figure 1 A method for identifying indoor intrusion and spatial structure changes based on wireless signal features is shown, which specifically includes the following steps:

[0041] Step 1. In the offline stage, collect the silent signal in the target environment, that is, collect z at each monitoring point 1 A silent Received Signal Strength (RSS) sequence S l ={S l (1),...,S l (M l )}(l=1,...,z 1 ), where M l is the length of the lth silent RSS sequence, S l (n)(n=1,...,M l ) is the nth RSS vector of the lth silent RSS sequence.

[0042] Step 2. Collect intrusion signals in the target environment, that is, collect z at each monitoring point 2 Article Invasion RSS Feed R l′ ={R l′ (1),...,R l′ (M l′ )}(l'=1,...,z 2 ), where M l′ is the length of the l′th intrusion RSS sequence, R l′ (m)(m=1,...,M l′ ) is...

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Abstract

The invention discloses an indoor intrusion and spatial structure change identification method based on a wireless signal characteristic. The method comprises the following steps of firstly, in an off-line phase, calculating a correlation coefficient between a silent signal and an intrusion signal, and a wavelet transform coefficient and an average power approximate value of the intrusion signal; then, in an online phase, using wavelet transform to detect whether a received signal at a monitoring point generates abnormal changes, and calculating average power of an abnormal signal and the correlation coefficient of the abnormal signal and the silent signal based on short-time Fourier transform; and finally, identifying indoor intrusion or a spatial structure change causing the abnormal signal according to the obtained average power and correlation coefficient. Based on characteristic analysis of a wireless signal, the indoor intrusion and spatial structure change identification method based on the wireless signal characteristic is proposed to improve robustness and environmental adaptability of an existing indoor intrusion detection system.

Description

technical field [0001] The invention belongs to indoor intrusion detection technology, in particular to an indoor intrusion and spatial structure change identification method based on RSS signal features. Background technique [0002] Intrusion detection technology has a wide range of applications in security protection fields such as valuables monitoring, empty-nest elderly monitoring, and military defense. At present, the indoor intrusion detection technology based on WLAN has become the mainstream research direction of domestic and foreign scholars because of its advantages of user privacy protection effect and strong ability to see interference under non-line-of-sight conditions. Among them, there are two relatively mature methods: ① Intrusion detection method based on wireless signal characteristics, which uses the influence of intrusion targets on signal strength, and uses its mean and variance two-dimensional statistical characteristics to detect whether there is an i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B13/00
CPCG08B13/00
Inventor 周牧刘柱王勇蒲巧林何维田增山
Owner CHONGQING UNIV OF POSTS & TELECOMM