Summary of my thesis
It's the summary of my thesis, so I'd be grateful if somebody could check it and make any necessary corrections :)
The aim of this thesis is the introduction and development of the location system based on ZigBee wireless standard that uses the received signal strength indicator RSSI. The system is composed of minimum four Digi XBee modules used for wireless communication. They create a network, in which three of them are reference nodes and one is localized in respect to others. Each node has its own role in the network. The localized node is the coordinator of the network, while others can be routers or end devices. Location is accomplished by trilateration or fingerprinting algorithms, that use RSSI to determine a distance between nodes. XBee modules can work in the command mode that allows, by using a proper command to read the received signal strength value. XBee modules are connected to Arduino modules. System is tested under various conditions, for example: changing the distance between modules, putting obstacles or applying different spatial distribution of modules. The final effect is the display of determined location in coordinate system.
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Corrections · 4
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It's the summary of my thesis, so I'd be grateful if somebody could check it and make any necessary corrections :)
The aim of this thesis is to introduce and chart the development of a location system based on the ZigBee wireless standard that uses the received signal strength indicator RSSI. The system is composed of a minimum of four Digi XBee modules used for wireless communication. They create a network in which three of them are reference nodes and one is localized in respect to others. Each node has its own role in the network. The localized node is the coordinating network, while others can be routers or end devices. Location is determined by trilateration or fingerprinting algorithms, that use RSSI to determine a distance between nodes. XBee modules can work in the command mode by allowing a proper command to read the received signal strength value. XBee modules are connected to Arduino modules, and this system is tested under various conditions, such as changing the distance between modules, putting obstacles or applying different spatial distribution of modules. The result is that the determined location is displayed using location coordinates.
That seems better but the subject matter is not one I understand fully, so this is the best I can do!;-)
The aim of this thesis is to introduce and chart the development of a location system based on the ZigBee wireless standard that uses the received signal strength indicator RSSI. The system is composed of a minimum of four Digi XBee modules used for wireless communication. They create a network in which three of them are reference nodes and one is localized in respect to others. Each node has its own role in the network. The localized node is the coordinating network, while others can be routers or end devices. Location is determined by trilateration or fingerprinting algorithms, that use RSSI to determine a distance between nodes. XBee modules can work in the command mode by allowing a proper command to read the received signal strength value. XBee modules are connected to Arduino modules, and this system is tested under various conditions, such as changing the distance between modules, putting obstacles or applying different spatial distribution of modules. The result is that the determined location is displayed using location coordinates.
That seems better but the subject matter is not one I understand fully, so this is the best I can do!;-)
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What sort of range is it working over, and how much is the signal strength reduced? would an object that absorbed or reflected any of the signals introduce errors? Would it be any better to transmit timing signals and measure propagation delays? Then any indirect signals could be identified.. You could also self-calibrate by checking the paths between every pair of nodes..
I think that 3 reference points will only define a location on a 2-D plane, or maybe one of two points above and below that plane.
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Very Good thesis , i lke it and it's amazing .
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