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Indoor positioning method based on RSS (Received Signal Strength)

An indoor positioning and received signal strength technology, applied in positioning, measuring devices, instruments, etc., can solve the performance impact of positioning, shadow fading and other problems, and achieve the effect of convenient data acquisition and accurate positioning

Active Publication Date: 2015-04-15
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the complexity of the indoor environment, such as multipath, shadow fading, interference, etc., indoor radio wave propagation has strong time-varying characteristics, which affects the positioning performance to a certain extent.

Method used

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  • Indoor positioning method based on RSS (Received Signal Strength)
  • Indoor positioning method based on RSS (Received Signal Strength)
  • Indoor positioning method based on RSS (Received Signal Strength)

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specific Embodiment

[0046] The invention mainly includes the sparse representation and reconstruction algorithm of the signal.

[0047] The mathematical model of sparse representation is introduced below. A real-valued finite-length one-dimensional discrete-time signal x can be regarded as an R N The N×1-dimensional column vector of the space, the elements are x[n], n=1,2,...,N. If it is an image or a high-dimensional data vector, it is converted into a long one-dimensional vector. R N Any signal in space can use N×1-dimensional orthonormal basis vectors A linear combination representation of . put the vector Form N×N orthonormal basis dictionary matrix as column vectors Any signal x can be expressed as

[0048] x = Σ i = 1 N θ i ...

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Abstract

The invention discloses an indoor positioning method based on RSS (Received Signal Strength). The data acquisition is convenient, extra receiving equipment is not needed, and the positioning is accurate. The indoor positioning method based on RSS comprises the following steps: (1) at an offline stage, collecting wireless signal receiving strength information on some positions of a space to construct a fingerprint database; (2) at an online stage, collecting signal strength on a walking path; (3) adding time and space constraint conditions by using a sparse representation algorithm, and establishing a positioning model; (4) calculating position coordinates corresponding to signal values on the path, and optimizing the result.

Description

technical field [0001] The invention belongs to the technical field of WLAN (Wireless Local Area Networks, wireless local area network) indoor positioning, and in particular relates to an indoor positioning method based on RSS (Received signal strength, received signal strength). Background technique [0002] Wireless Local Area Network (WLAN) is a brand-new information acquisition platform, which can realize complex and large-scale positioning, monitoring and tracking tasks in a wide range of application fields, and the self-location of network nodes is the basis and premise of most applications. The currently popular Wi-Fi (Wireless Fidelity, wireless fidelity technology) positioning is a positioning solution of IEEE802.11, a series of wireless local area network standards. The system adopts the combination of empirical test and signal propagation model, which is easy to install, requires few base stations, can use the same underlying wireless network structure, and has hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00G01S5/02
CPCG01S5/0215H04W64/00
Inventor 李婷姝胡永利孙艳丰尹宝才
Owner BEIJING UNIV OF TECH