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A novel indoor localization system is presented, where LED beacons are utilized to determine the position of the target sensor, including a camera, an inclinometer, and a magnetometer. The beacons, which can be a part of the existing lighting infrastructure, transmit their identifiers for long distances using visible light communication techniques. The sensor is able to sense and detect the high-frequency...
In this paper the design of an LED-based beaconing infrastructure is introduced, which can be utilized in indoor localization systems. The LED beacons, which may be part of the existing lighting infrastructure, are blinking with high frequency invisible for human eyes, while the detectors are regular cameras. Since the sampling frequency of the cameras is much lower than the blinking frequency, the...
An intrusion detection system was developed to detect illegal entries to guarded forest areas and thus help the prevention of timber theft and other damages, caused by illegal activities. The system contains accelerometers, magnetometers and geophones to provide high detection reliability and fast reaction time. The performance of the proposed system is illustrated by real measurements.
In this paper a novel sensor is proposed, which can be applied both to intrusion detection or tamper detection purposes. The device senses vibrations caused by the attacker, using MEMS accelerometers, to provide alarm signals. The sensor uses low duty cycling operation to conserve its energy, thus it is suitable for wireless applications. The performance of the sensor is illustrated with real measurements.
In this paper a low-power communication protocol is proposed for sensor networks, where sensors mostly send measurements and rarely receive commands. The proposed protocol optimizes energy utilization on sensor nodes by using a modified MAC-layer, with acknowledgment frames piggy-backing meta-information towards sensor nodes. The proposed method is evaluated using real measurements using a modified...
In this paper a TDMA based routing scheme is proposed for such wireless sensor networks, where nodes form multiple connected cycles. The proposed method provides fault tolerance, guaranteed delivery times, and low power consumption. The paper discusses the routing scheme and its implementation details, and provides several performance tests.
In this paper a fault-tolerant energy-efficient Time Division Multiple Access (TDMA) based routing scheme is proposed for wireless sensor networks. The proposed system provides guaranteed delivery times and tolerates node and link failures. The software architecture and the performance properties of the system are described.
In this paper a wireless distributed building safety and security framework will be introduced. The main design goals of the system are completely distributed operation, flexibility, robustness, fast response time, and energy efficiency. The framework uses low duty cycle TDMA-based communication scheme, where the scheduling is the result of optimization, based on network discovery measurements. The...
Sensor networks, constructed from a large number of inexpensive devices can be used to provide accurate and robust acoustic localization services. A consistency-based fusion method, which can be utilized for Time Difference of Arrival (TDOA) measurements has recently been proposed. The fusion algorithm is able to find the global optimum with good accuracy, but the location estimator is not optimal...
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