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Indoor carrier phase positioning model construction method suitable for WiFi

A carrier phase and construction method technology, applied in positioning, radio wave measurement system, measurement device, etc., can solve the problem of inaccurate positioning of single carrier phase information, and achieve the effect of improving resolution

Inactive Publication Date: 2020-03-17
CHONGQING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

However, single carrier phase information positioning is inaccurate, so it is necessary to combine TOA (Time of Arrival) information to build a joint positioning model

Method used

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  • Indoor carrier phase positioning model construction method suitable for WiFi
  • Indoor carrier phase positioning model construction method suitable for WiFi
  • Indoor carrier phase positioning model construction method suitable for WiFi

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Embodiment Construction

[0018] specific implementation plan

[0019] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0020] figure 1 It is a flowchart of the present invention, and the steps are as follows:

[0021] Step 1. In the indoor environment, assume that the room size is L×W×Am 3 ,Such as figure 2 As shown, where L is the length of the room, W is the width of the room, and A is the height of the room. Use i (i=1,2,...,n) receivers for positioning, each receiver uses a uniform linear array composed of N (N>3) array elements, and the signal uses Orthogonal Frequency DivisionMultiplexing, OFDM) modulation method, the number of subcarriers is M. WiFi outputs the CSI information of each subcarrier, which corresponds to the carrier phase value, from which 30 subcarriers are selected.

[0022] The phase needs to be corrected due to linearity errors introduced by signal sampling and hardware. It can be seen from the OFDM modulation metho...

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Abstract

The invention provides an indoor carrier phase positioning model construction method suitable for WiFi. The method comprises the following steps: firstly, extracting CSI (Channel State Information) information and preprocessing the CSI information to obtain a relatively stable carrier phase observation value; then establishing a target signal super-resolution parameter estimation model based on WiFi by utilizing a two-dimensional MUSIC (Multiple Signal Classification) algorithm, and extracting TOA (Time of Arrival) to construct a pseudo-range observation value; secondly, obtaining a pseudo-range and a carrier phase observation value of a direct path based on a positioning receiver and constructing a carrier phase ranging equation; and finally, constructing a TDOA (Time Difference of Arrival) differential positioning model by utilizing the carrier phase ranging equation based on a plurality of positioning receivers. According to the method, the carrier phase positioning model is effectively constructed and a model basis is provided for carrier phase accurate positioning.

Description

technical field [0001] The invention belongs to indoor positioning technology, and relates to an indoor carrier phase positioning model construction method suitable for WiFi. Background technique [0002] In recent years, services based on location information are closely related to people's lives, such as shared bicycles, mobile phone taxi services, food delivery services, express delivery information monitoring, and smart care for the elderly and children. With the rapid development of location-based applications, people have higher and higher requirements for the accuracy and reliability of positioning technology. At the same time, high-precision positioning services play an important role in the fields of national security, economic development, and social livelihood. Satellite-based outdoor positioning technology can achieve centimeter-level positioning accuracy, and mobile communication network-based outdoor positioning technology can achieve tens of meters positionin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/02
CPCG01S5/0257
Inventor 何维岳紫颖田增山李泽王中春
Owner CHONGQING UNIV OF POSTS & TELECOMM
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