Abstract
In this study we present a WSN algorithm for localization which increases efficiency in time, energy and cost of localization radar systems. The algorithm is designed using a hybrid of two widely used localization techniques, Time of Arrival (ToA) and Received Signal Strength Indicator (RSSI). The target is to achieve a design which is more efficient than RSSI and requires no nodes synchronization which is fundamental in ToA. Virtual References Tags (VRTs) play a key role in improving efficiency by providing a reference point near the target which is discussed in experimental results of WSN with four different number of VRTs and lastly a comparison of proposed with existing methods is given.
Highlights
Technology advances as well as Wireless Sensor Networks (WSNs)
Whenever intruder arrives in surveillance area it is monitored with Received Signal Strength Indicator (RSSI) and Time of Arrival (ToA) hybrid localization technique and Virtual References Tags (VRTs) provide reference point closest to actual intruder location
The design for localization and path detection of human intruder (Piuzzi et al, 2012), so ideally the radar cross-section can be considered as 1 m2. Both antenna gains are kept at 0 dB and 1.5 MHz of Pulse Repetition Frequency (PRF) is used. 29, 55, 209 and 1721 number of VRTs are used in four cases, respectively
Summary
Technology advances as well as Wireless Sensor Networks (WSNs). Due to its vast applications, these types of networks became popular over the past years. For example for an unknown intruder with no tags cannot be localized, positioning of actual reference tags symmetrically over surveillance area makes the system complicated, greater number of sensor nodes are used making these system suitable only in case of limited surveillance area. Whenever intruder arrives in surveillance area it is monitored with RSSI and ToA hybrid localization technique and VRTs provide reference point closest to actual intruder location. This algorithm design has no synchronization problem (like in ToA) and has greater accuracy than RSSI. The number of VRTs for different design can vary depending on design requirements These virtual references increases efficiency and overcomes nodes synchronization problem. VRTs overcome synchronization problem and in some aspects help in identifying objects other than target
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