Environment adaptive RSSI local positioning system and method
A positioning method and self-adaptive technology, applied in transmission systems, transmission monitoring, electrical components, etc., can solve the problems of inconsistent receiver and antenna performance, limited accuracy of RSSI positioning system, etc., to achieve a wide range of applications, convenient implementation, reduction of effect of error
Active Publication Date: 2012-12-12
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 inconsistency of the performance of the receivers and antennas of each node, environmental factors and other multiple influences, the accuracy of the RSSI positioning system is limited.
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[0020] The present invention will be further described below in conjunction with drawings and embodiments. In the RSSI positioning system, the present invention uses the loss factor corresponding to the area updated in real time 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 improve the positioning accuracy. The use of the loss factor obtained in real time to calculate the distance means that in the application system of RSSI (Received Signal Strength Indication), the loss factor of each reference node in different areas adopts the value measured in real time, and there are loss factors in the monitoring software. A database of factor parameters, which is updated at a configurable frequency. The loss factor is calculated and obtained after regularly measuring the signal strength at the center of every four adjacent reference nodes, and then stored in the software ...
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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 strength, 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: positioning technology based on time, positioning technology based on signal strength (RSSI, received signal strength indication), positioning technology based on signal angle (AOA), and positioning technology based on time 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 the visibility of the environment; AOA requires additional hardware support. The hardware composition of the RSSI positioning system is as follows: figure 1 As shown, it includes: (1) 2 or more reference nodes, each node has the funct...
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IPC IPC(8): H04L29/06H04W64/00H04B17/00
Inventor 魏斌虞致国黄召军陈子逢万书芹
Owner 58TH RES INST OF CETC