RSS (Root Sum Square)-based passive motion tracking method suitable for sparse node distribution

A motion tracking and sparse technology, applied in location-based services, wireless communications, electrical components, etc., can solve problems such as inconvenience, shortage, and increased node maintenance costs, and achieve the effect of expanding the sensing range, reasonable design, and good performance.

Inactive Publication Date: 2012-10-03
BEIJING ZHONGFANG SHIXIN TECH
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Problems solved by technology

Although higher accuracy can be obtained by doing so, at the same time, the work of deploying nodes will become more cumbersome and inconvenient, and the maintenance cost of nodes will also increase greatly. More importantly, in some application scenarios such as disaster rescue In general, we us

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  • RSS (Root Sum Square)-based passive motion tracking method suitable for sparse node distribution
  • RSS (Root Sum Square)-based passive motion tracking method suitable for sparse node distribution
  • RSS (Root Sum Square)-based passive motion tracking method suitable for sparse node distribution

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Embodiment Construction

[0036] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0037] An RSS-based passive motion tracking method suitable for sparsely distributed nodes. On a wireless sensor network with sparsely distributed nodes, the tracking accuracy is not lower than that of densely distributed nodes. Usually, when the number of nodes and links per unit area is small, the available RSS measurement data will be insufficient, so the tracking accuracy will decrease accordingly. In order to solve this problem, we divide the multipath components of wireless signals into two types based on the general diffraction theory (UTD: Uniform Theory of Diffraction), and deduce the relationship between these two types of multipath components and the RSS measurement value ; on this basis, we propose a measurement model that comprehensively considers the influence of these two types of components, which expands the sensing range of each l...

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Abstract

The invention relates to an RSS (Root Sum Square)-based passive motion tracking method suitable for sparse node distribution. The RSS-based passive motion tracking method is characterized by comprising the steps of: (1) setting N particles with random positions; (2) respectively working out a long-term measured value and a short-term measured value of RSS of each link when a target is located at the position of each particle according to a long-term measured value mode land a short-term measured value model for each particle; (3) comparing two RSS values of each particle with the actually measured RSS values, processing the two RSS values of each particle to obtain the weight corresponding to the particle at each position; (4) resampling the weight corresponding to the particle at each position; (5) calculating an estimation result of a target position; (6) updating the position of each particle according to an autoregression Gaussian model; and (7) returning to (2) and repeat the execution until a tracking process is finished. The method disclosed by the invention is reasonable in design, has the advantages of enlarging a perception range of each link in a sensor network and guaranteeing the tracking accuracy on a wireless sensor network with sparse node distribution, and has a favorable performance in sparse node networks under different environments.

Description

technical field [0001] The invention belongs to the technical field of passive motion tracking, in particular to an RSS-based passive motion tracking method suitable for sparsely distributed nodes. Background technique [0002] Passive motion tracking (DFMT: Device-free Motion Tracking) based on received signal strength (RSS: Received Signal Strength) is an emerging tracking technology based on wireless sensor networks. The RSS value can be measured from the communication link connecting different nodes in the sensor network. In the area covered by the sensor network, moving people or objects can attenuate or scatter radio waves on links that cross their moving lines or are located near their lines. Due to the corresponding changes of RSS due to these effects, the position of the moving target can be estimated by using this characteristic of RSS. The tracking system continuously collects RSS data, and then uses these data to track the target according to a certain measureme...

Claims

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Application Information

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IPC IPC(8): H04W4/02H04W64/00
Inventor 杨永民江峰李直
Owner BEIJING ZHONGFANG SHIXIN TECH
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