Environment adaptive RSSI local positioning system and method

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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Problems solved by technology

(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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