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Method and device for realizing wireless sensor network (WSN) node positioning by establishing virtual synthetic aperture radar (SAR) image

A technology for node positioning and image realization, which is used in measurement devices, reflection/re-radiation of radio waves, and beacon systems using radio waves, etc. It can solve the problems of insufficient WSN node positioning accuracy and high energy consumption.

Active Publication Date: 2019-05-17
TONGDING INTERCONNECTION INFORMATION CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a method and device for WSN node positioning by constructing virtual SAR images, aiming to solve the problems of insufficient positioning accuracy and high energy consumption of WSN nodes in the prior art

Method used

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  • Method and device for realizing wireless sensor network (WSN) node positioning by establishing virtual synthetic aperture radar (SAR) image
  • Method and device for realizing wireless sensor network (WSN) node positioning by establishing virtual synthetic aperture radar (SAR) image
  • Method and device for realizing wireless sensor network (WSN) node positioning by establishing virtual synthetic aperture radar (SAR) image

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specific Embodiment 1

[0098] In the embodiment of the present invention, the PAST technology refers to a projection approximation subspace tracking technology (Projection Approximation Subspace Tracking, PAST for short).

[0099] Assuming that there is an unknown node O in the three-dimensional space where the WSN is located, its real coordinates are (x o ,y o ,z o ). There are N beacon nodes connected to the unknown node O, respectively S 1 S 2 S 3 ... ... S N , where the nth connected beacon node S n The coordinates are (x n ,y n ,z n ), the wavelength of the transmitted signal between nodes is λ, without loss of generality, the initial phase of all transmitted signals is set to 0, and the signal between the beacon node and the unknown node O under ideal conditions without considering noise interference is:

[0100]

[0101] Among them, d n To connect to the beacon node S n The real physical distance from the unknown node O. Have:

[0102]

[0103] It can be seen from formu...

specific Embodiment 2

[0184] Such as Figure 8 As shown, the embodiment of the present invention provides a device for WSN node positioning by constructing a virtual SAR image, including:

[0185] A construction module 201, configured to perform multiple samplings of signals between WSN nodes and construct a virtual SAR image according to the similarity between the SAR range unit signal and the signal between WSN nodes;

[0186] The estimation module 202 is used to estimate the signal subspace by using each range unit signal of the virtual SAR image based on the PAST technology, suppress noise interference, and determine phase information between WSN node signals at the same time;

[0187] The positioning module 203 is configured to analyze the difference between the actual received signal and the theoretical received signal between the nodes based on the cosine similarity principle based on the phase information between the WSN node signals, so as to realize WSN node positioning.

[0188] Prefera...

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Abstract

The invention discloses a method and device for realizing wireless sensor network (WSN) node positioning by establishing a virtual synthetic aperture radar (SAR) image. The method comprises the stepsthat according to the similarity between signals of SAR distance units and signals between WSN beacon nodes, the virtual SAR image is established based on the signals between the WSN nodes, and a problem of phase information estimation of the signals of the WSN nodes under a noise interference condition is transformed into a problem of self-focusing processing of the virtual SAR image; a projection approximation subspace tracking (PAST) technology is used for performing self-focusing processing on the virtual SAR image, so that phase information of the signals between the WSN nodes is precisely estimated under a low signal-to-noise ratio condition; and finally, based on a corresponding relationship between the phase information of the signals between the nodes and a physical distance, a target function is established based on the principle of the cosine similarity, positioning of an unknown node is realized by searching an optimal solution to the target function, and positioning of theWSN nodes under the low signal-to-noise ratio condition is realized. A simulation experiment proves that the method and device for realizing WSN node positioning by establishing the SAR image is goodin positioning precision, low in positioning power consumption, and is suitable for WSN node positioning.

Description

technical field [0001] The invention relates to the technical field of WSN node positioning, in particular to a method and device for realizing WSN node positioning by constructing virtual SAR images. Background technique [0002] Virtual synthetic aperture radar, Synthetic Aperture Radar, referred to as SAR. Wireless sensor network, Wireless Sensor Network, referred to as WSN. WSN is a basic component of the Internet of Things. It uses multiple sensor nodes to form a wireless network through self-organization. It is an information production and collection system used by the Internet of Things to perceive, identify, and process monitored objects in the network coverage area. With the continuous development of sensor technology, embedded computing technology, computer network technology and wireless communication technology, wireless sensor network technology has gradually matured, and has been widely used in military reconnaissance, environmental monitoring, target trackin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90G01S13/08G01S1/08
CPCG01S13/08G01S1/08G01S13/90G01S13/9027Y02D30/70
Inventor 蒋锐沈小平陈斌蔡文杰屠耀华
Owner TONGDING INTERCONNECTION INFORMATION CO LTD
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