Indoor Trajectory Prediction Method Based on Bidirectional Recurrent Neural Network

A neural network and two-way loop technology, applied in biological neural network models, measurement devices, surveying and navigation, etc., can solve problems such as inability to save too much context information, data sparsity of sampling points, indoor and outdoor space differences, etc.

Inactive Publication Date: 2019-07-05
JILIN UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the existing indoor trajectory prediction algorithm, such as the difference between indoor and outdoor space, the data sparsity of the sampling points used to predict the trajectory, and the inability to save too much context information, etc.

Method used

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  • Indoor Trajectory Prediction Method Based on Bidirectional Recurrent Neural Network
  • Indoor Trajectory Prediction Method Based on Bidirectional Recurrent Neural Network
  • Indoor Trajectory Prediction Method Based on Bidirectional Recurrent Neural Network

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Embodiment Construction

[0030] Step 1. Indoor space pretreatment;

[0031] (1) Divide the indoor space into a reference system composed of grids of the same size according to the set value, and number CID(x, y) in the two directions of x and y, and use the historical data trajectory to obtain the target moving indoors The grid sequence that passes through time, to judge the connectivity between the grids; for historical data, there may be sampling errors, in order to ensure the validity of historical data, set the threshold of the number of data points, if the historical data points in the grid exceed the set threshold, the historical data in the grid is considered to be valid.

[0032] Definition 1. Spatial proximity: For the grid number CID(x,y), the grid with |x-x′|≤1,|y-y′|<1 or |x-x′|<1,|y-y′|≤1 is defined as close in space.

[0033] Definition 2. Spatial connectivity: In the historical trajectory, if there are directly connected historical trajectories for spatially close grids, it is defined...

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Abstract

The invention discloses an indoor track prediction method based on a bidirectional circulation neural network. The method comprises the following steps: step one, preprocessing an indoor space; step two, clustering the destinations of concentrated tracks obtained by indoor positioning; step three, using an indoor positioning technology to obtain the sampling point sequence of a target to be predicted; step four, calibrating the sampling point sequence; and step five, according to the characteristics of indoor track prediction problems, improving the structure of a bidirectional circulation neural network. A self-adaption gradient regulator is used to carry out training to adjust the data of an embedding list so as to minimize the deviation. The calibrated sampling point sequence is input into an improved bidirectional circulation neural network to predict the destination. The provided algorithm can well predict the track of an indoor moving target. The space connectivity problem is solved through historical track collection. The sampling point sequence calibration can guarantee that the sampling points are not influenced by sparse data, and the prediction accuracy is improved.

Description

technical field [0001] The invention relates to bidirectional cyclic neural network and indoor positioning Background technique [0002] In people's daily life, a large number of trajectories are generated every day. Although there have been many analyzes on the trajectories of moving objects in recent years, most of them are aimed at outdoor behaviors and have produced good experimental results. In fact, people also generate a large number of trajectories indoors, but the measurement methods and spatial connectivity of indoor and outdoor spaces are very different. The outdoor space is a typical space network or Euclidean space, and the indoor space is defined by a grid. Composition, and the adjacent grids in the indoor space may not be physically connected, for example, the grids of two adjacent rooms in the room are connected in space, but due to the limitation of the wall, they are not connected physically. Trajectory analysis made a big difference. At the same time, GP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/20G06N3/02
CPCG01C21/206G06N3/02
Inventor 王生生岳晴
Owner JILIN UNIV
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