Environment adaptive RSSI local positioning system and method

A technology of local positioning system and positioning method, applied in transmission system, transmission monitoring, electrical components and other directions, can solve the problems of inconsistency of receiver and antenna performance, limited accuracy of RSSI positioning system, etc. The effect of improving accuracy

Active Publication Date: 2011-04-13
58TH RES INST OF CETC
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(2) The mobile node to be positioned has the same transmission protocol as the reference node, but only has the function of wireless transmission
However, in the prior art, due to the i

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  • Environment adaptive RSSI local positioning system and method
  • Environment adaptive RSSI local positioning system and method
  • Environment adaptive RSSI local positioning system and method

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Embodiment Construction

[0020] The present invention will be further described below with reference to the drawings and embodiments. In the RSSI positioning system of the present invention, the real-time updated area corresponding loss factor is used to calculate the distance from the mobile node to the reference node, so that environmental factors can be reflected in the real-time loss factor calculation, and the positioning accuracy is improved. The use of the loss factor obtained in real time to calculate the distance means that in the RSSI (Received Signal Strength Indication) application system, the loss factor of each reference node in different areas is measured in real time, and there is loss in the monitoring software The database of factor parameters is updated at a settable frequency. The loss factor is calculated and calculated after measuring the signal strength at the center of every four adjacent reference nodes at regular intervals, and then stored in the software database. In the pos...

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Abstract

The invention provides an environment adaptive received signal strength indicator (RSSI) local positioning system and an environment adaptive RSSI local positioning method. The system and the method implement positioning based on signal energy strength, wherein the signals can be radio-frequency signals or underwater acoustic signals. The method comprises the following positioning steps of: in the positioning process, measuring reference node path loss factors of each corresponding area in real time by using reference nodes, and updating a database of the loss factors according to the set frequency; when the signal of a movable node is received, determining the area of the movable node by using three nodes with strongest signals; calculating the distance from the movable node to the threereference nodes by using the loss factors of the reference nodes of the corresponding area; and calculating the position of the movable node by using a trilateration method. The positioning technology has the advantage of overcoming the defect of low precision of the conventional RSSI positioning technology due to environmental change in a variable environment, for example, a warehouse where goods are frequently delivered.

Description

Technical field [0001] The invention relates to a positioning method based on signal energy intensity, in particular to an environment adaptive RSSI local positioning system and method. Background technique [0002] Local positioning technology can be divided into three categories according to the principle: time-based positioning technology, signal strength (RSSI, received signal strength indication)-based positioning technology, signal angle (AOA)-based positioning technology, time-based positioning technology can be divided into Time of arrival (TOA) and time difference of arrival (TDOA). TOA requires precise time synchronization between reference nodes; TDOA is limited by the short ultrashort wave transmission distance and visibility of the environment; AOA requires additional hardware support. The hardware composition of RSSI positioning system is as follows figure 1 As shown, it includes: (1) 2 or more reference nodes, each node has the function of wireless receiving and ...

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Application Information

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IPC IPC(8): H04W64/00H04B17/00
Inventor 魏斌虞致国黄召军陈子逢万书芹
Owner 58TH RES INST OF CETC
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