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Node localization is one of main support technologies for wireless sensor networks, and the location information of sensor nodes plays a key role in many application areas of wireless sensor networks. The positioning is the basis of tracking where target tracking is a fundamental application of wireless sensor network. The nature of target tracking is multi-node cooperation, and the core issue of...
The TDoA (Time Difference of Arrivals) based location tracking systems using the RF and ultrasonic signals often give unacceptable errors due to the line-of-sight limitation of the ultrasonic signal. Overcoming this limitation, this paper proposes a novel TDoA based location tracking technique that explicitly exploits the ultrasonic reflection scenarios in the target location estimation. The proposed...
The “Enterprise” segment is becoming a popular Location Based Service (LBS) application area, and is the topic of this paper. GPS-based devices have been widely used in this segment for Field Force Tracking. These devices are costly and can be tampered with. Depending on the number of such devices that need to be installed by an Enterprise, this shall result in significant Capital Expenditure (CAPEX)...
Today, positioning techniques like GPS already has satisfied performance in outdoor environment, but there are many problems in indoor positioning, and some conventional methods for indoor positioning also have their disadvantage. In order to overcome these problems and find a better performance over these methods, we proposed a new positioning and tracking method. It is based on the wireless sensor...
Omni-directional vision (omni vision) has been used in many fields because of its advantage of extremely wide view; one way to establish omni vision system is using fisheye lens. Target recognition and tracking is a tough task in computer vision, which is even more challenging in outdoor environment. In this paper, a recognition and tracking algorithm suitable for a natural target in outdoor environment...
The target recognition, beacon tracking and object localization based on omni-directional vision (omni-vision) system are introduced in this paper. The development of omni-vision appears to have definite advantages for the performance of the mobile systems and real time control. We use a fisheye lens with the view angle of 185deg to build the omnidirectional vision system. A prototype of the unique...
In this paper, we propose a modified incremental subgradient (MIG) algorithm with a variable step size for positioning and tracking a target in wireless sensor networks. The proposed positioning scheme formulates location estimation as a nonlinear least-squares problem using the received signal strength, and then applies the MIG algorithm with a fixed step size to solve the problem. This scheme can...
The problem addressed in this work is to separate the signals of moving sources with independent component analysis (ICA) and tracking the kinematics (position, velocity, acceleration) of each individual source in the working space using particle filters. To identify the unpredictable movement of the speaker over time, the new proposed state switching scheme handles the uncertainty of the speaker's...
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