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Method for sensing position of object in Internet of things

A technology of the Internet of Things and objects, which is applied in the direction of bus network, measuring device, and cooperative operation device, etc., can solve the problems of inaccurate ranging and phase ambiguity, and achieve the effect of reducing ranging error and stabilizing relative error

Inactive Publication Date: 2011-09-14
BEIJING PICOHOOD TECH
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Problems solved by technology

[0010] If the frequency band of UHF is about 900MHz for the system, the wavelength is about 33cm, and for the indoor positioning environment, it is generally a few meters to tens of meters. Therefore, the phase There is a phase ambiguity of 2nπ, which leads to inaccurate ranging,

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  • Method for sensing position of object in Internet of things
  • Method for sensing position of object in Internet of things
  • Method for sensing position of object in Internet of things

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Embodiment Construction

[0046] The present invention will be described in further detail below with regard to specific embodiments.

[0047] The IoT location awareness system is mainly composed of 4 UHF RFID readers, antennas, electronic tags and total node modules. figure 1What is shown is the system structure in a region. UHF RFID readers are placed in the appropriate positions within the positioning range. Each UHF RFID reader is connected to each other through the CAN bus and connected to the main node. The general node is connected to the Internet, and a three-dimensional coordinate axis is established before positioning. The coordinates of each reader are known. When the tag or the target carrying the tag is in the location-aware area, the four UHF RFID readers are respectively Obtain the location information of the tag, then communicate with the master node, and send the obtained position information to the master node. The master node calculates the position coordinates of the tag through the...

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Abstract

The invention discloses a method for sensing a position of an object in the Internet of things, which is characterized by comprising the following steps of: establishing a three-dimensional coordinate system, and positioning a system for sensing the position of the object in the Internet of things, wherein the system consists of four ultra high frequency radio frequency identification (UHF RFID) reader-writers, an electronic tag and a general node module; determining the three-dimensional coordinate position of each UHF RFID reader-writer in the three-dimensional coordinate system; attaching the electronic tag to a tested object; testing a distance primarily to acquire a primarily-tested distance value d; solving an accurate actual distance d'; and solving the accurate position of the electronic tag. The method has the advantages that: by a phase difference of arrival (PDOA) distance measurement method with a dynamic frequency difference, the relative error of a measurement system can be stable, and a distance measurement error can be reduced when the actual distance is small.

Description

technical field [0001] The invention belongs to an object position testing technology, in particular to a method for sensing the position of an Internet of Things object. technical background [0002] In recent years, the Internet of Things technology has been greatly developed. The Internet of Things, as the name suggests, is the "Internet of Things Connected". According to the agreed agreement, any object is connected to the Internet for information exchange and communication, so as to realize a network of intelligent identification, positioning, tracking, monitoring and management of objects. [0003] The location awareness of the Internet of Things is to accurately locate the location of objects connected to the network. At present, some relatively mature positioning technologies are available. GPS, as a widely used positioning technology, is used in various occasions, but In indoor and other areas where satellite signals cannot be transmitted accurately in line of sigh...

Claims

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Application Information

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IPC IPC(8): G06K17/00G01S13/08H04L12/40
Inventor 熊东刘国金曾孝平王峰杨学敏王靖赵宇陈佳唐盟宋林帅胡磊陈磊但成福
Owner BEIJING PICOHOOD TECH
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