Accurate Localization in Acoustic Underwater Localization Systems

Underwater Acoustic Localization and Packet Scheduling

In an underwater medium the sound speed is not constant, but varies with depth. This phenomenon upsets the linear dependency of the distance traveled by an acoustic wave to the time it takes for the wave to travel that distance, and therefore makes existing distance-based localization algorithms less effective in an underwater environment. This paper addresses the problems of localizing a fixed...

Array Processing: Underwater Acoustic Source Localization

Aidloc: an Accurate Acoustic Indoor Localization System

We present Aidloc, an acoustic indoor localization system based on acoustic ranging which is very convenient for smartphone positioning. An Aidloc demo system consists of 5 acoustic beacons and a smartphone. Beacons are deployed in different hight to establish a beacon space. This gives a 3D relative coordinate for 3D target localization. A combined localization approach of TDOA and TOA is used...

Localization with a Mobile Beacon in Underwater Acoustic Sensor Networks

Localization is one of the most important issues associated with underwater acoustic sensor networks, especially when sensor nodes are randomly deployed. Given that it is difficult to deploy beacon nodes at predetermined locations, localization schemes with a mobile beacon on the sea surface or along the planned path are inherently convenient, accurate, and energy-efficient. In this paper, we p...

Target Localization in Underwater Acoustic Sensor Networks Using RSS Measurements

This paper addresses the target localization problems based on received signal strength (RSS) measurements in underwater acoustic wireless sensor network (UWSN). Firstly, the problems based on the maximum likelihood (ML) criterion for estimating target localization in cases of both known and unknown transmit power are respectively derived, and fast implementation algorithms are proposed by tran...