Abstract: A street light monitoring system has a small fraction of the street lights in the system being anchor nodes that are configured to detect and store their own actual fixed position, thereby acting as reference points. Further, the other street lights are referred to as blind nodes and do not have their actual fixed position but can derive their position using the coordinates of the anchor nodes and estimating their distance to them. The distance estimation for any blind node can be performed using a received signal strength indication (RSSI) measured at the respective blind node for small distances of up to a threshold value and a link quantization technique takes advantage of the typical placement of the street lights. Inferred distances between the street lights can be assigned to pre-determined categories of distances for a coarse estimation and further position adjustment to a closest possible “real” position.

Abstract: An embodiment concerns the field of real-time location systems (RTLS) based on RSSI (Received Signal Strength Indication) measurements. An embodiment is based on determining the distances between wireless device of a network based on a model that describes the relation of the RSSI value relative to the packet exchanged between nodes as a function of the distance, wherein said model depends on at least one characteristic parameter of the transmission channel and wherein at least said characteristic parameter of the transmission channel is determined periodically and automatically, exploiting the known distances among fixed nodes. In this way, the errors relative to possible time-variability of the transmission channel are reduced and the accuracy and stability of the location measurements are increased.

Abstract: An embodiment concerns the field of real-time location systems (RTLS) based on RSSI (Received Signal Strength Indication) measurements. An embodiment is based on determining the distances between wireless device of a network based on a model that describes the relation of the RSSI value relative to the packet exchanged between nodes as a function of the distance, wherein said model depends on at least one characteristic parameter of the transmission channel and wherein at least said characteristic parameter of the transmission channel is determined periodically and automatically, exploiting the known distances among fixed nodes. In this way, the errors relative to possible time-variability of the transmission channel are reduced and the accuracy and stability of the location measurements are increased.

Abstract: A street light monitoring system has a small fraction of the street lights in the system being anchor nodes that are configured to detect and store their own actual fixed position, thereby acting as reference points. Further, the other street lights are referred to as blind nodes and do not have their actual fixed position but can derive their position using the coordinates of the anchor nodes and estimating their distance to them. The distance estimation for any blind node can be performed using a received signal strength indication (RSSI) measured at the respective blind node for small distances of up to a threshold value and a link quantization technique takes advantage of the typical placement of the street lights. Inferred distances between the street lights can be assigned to pre-determined categories of distances for a coarse estimation and further position adjustment to a closest possible “real” position.