Indoor radio tomography imaging enhancement method capable of deleting interfering link based on motion prediction

Abstract

The invention discloses an indoor radio tomography imaging enhancement method capable of deleting an interfering link based on motion prediction, and belongs to the technical fields of target detecting and tracking in a radio network. The method comprises the following steps of finding out an intersection set formed by shadow fading links by virtue of clusters; taking the center of the set as estimation of a target position at an initial moment, and utilizing a target motion model and the positioning result of the last moment to obtain estimation of the target position at the current moment through Kalman filtering, so as to delete the interfering link which is relatively far away from the target position; finally carrying out RTI (radio tomography imaging) through the shadow fading links, and obtaining the current moment position by using Kalman updating on the basis of the RTI. The effects of non-shade fading links are eliminated based on the motion prediction; false targets can be effectively removed; the fading effect caused by presence of the target is relatively accurately highlighted, thus target positioning is relatively accurate in a multipath environment; the imaging quality is improved; relatively excellent dynamic tracking is achieved.

Description

technical field [0001] The invention relates to a positioning method of a wireless tomography system, in particular to a more accurate measurement and positioning model of a wireless tomography system based on motion prediction and deletion of interference links, and belongs to the technical field of target detection and tracking in wireless networks. Background technique [0002] Wireless tomography (RTI) is a technology that uses wireless nodes to locate and track targets. It images the monitoring area according to the link attenuation caused by target occlusion in the monitoring area, and realizes the positioning and tracking of the target. Wireless tomography does not require the target to carry anything, and it only requires the received signal strength (RSS) value of the wireless node, which most wireless devices can provide today. Therefore, this technology can be easily extended to the existing network without adding any hardware. The technology has a wide range of ...

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Problems solved by technology

However, for the situation that a reflection path with strong power is blocked by the target, because the characteristics in the time domain of this situation are the same as those in the time domain when the LOS path is blocked, the processing method in the time domain is suitable for a certain power reflection path. If the reflection path is blocked, there is nothing you can do about it

[0016] So far, no one has proposed a problem similar to the situation where a certain powerful reflection path is blocked and the solution to related problems, and no one has done similar research in other fields

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