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In wireless sensor networks, nodes are deployed in sensor field for various monitoring applications such as tracking, rescue operations, disaster relief, traffic monitoring, etc. So node localization is one of the fundamental challenges in the wireless sensor network. This study presented an overview of the various localization techniques used to find the position of a sensor node in wireless sensor...
Demand for plasma bubble monitoring for global navigation satellite system users is increasing. Large-scale ionospheric structures associated with plasma bubbles are studied by measuring trans-equatorial propagation of HF radio waves from Australia to Japan. Propagation distance of the radio waves are simultaneously measured with two digital radio receiver, one near the radio transmitting site in...
This paper presents an integrity monitoring method for tight integration of an Inertial Measurement Unit (IMU) and a GPS receiver. The method is applied to data from a Maxus sounding rocket used for microgravity research. It is crucial to determine the rocket position during launch to ensure a safe landing location. Today, the navigation relies on IMU integration only. Involving a GPS receiver enhances...
The need to prevent train accidents inside railway tunnels has motivated the national railway Company Ferrovie dello Stato to launch a project aimed at installing a number of train monitoring portals at a suitable distance from the tunnel entrances. The first experimental portal, and a second operative one, have been installed by SIRTI S.p.A., respectively in Rastignano and Formia. Our company, in...
"The Marauder's Map" is a magical map in J. K. Rowling's fantasy series, "Harry Potter and the Prisoner of Azkaban". It shows all moving objects within the boundary of the "Hogwarts School of Witchcraft and Wizardry". In this paper, we introduce a similar attack to location privacy in wireless networks. Our system, namely the digital Marauder's map, can reveal the locations...
At present, according to the request for production and management on the unmanned off-shore oil platform, the paper designs a remote monitoring system based on the wireless communication, and introduces the requirements of the system, the structure of hardware and software. The wireless communications and data acquisition system are mainly composed of DATA-LINC's wireless modem SRM6100 and Siemens...
The paper describes a new data fusion method for positioning of mobile users in an ad hoc wireless network. The method relies on a double time difference of data arrival. In difference to the presently used alternatives it does not rely on time synchronization of various nodes of the system. It reduces to solving a nonlinear system of equations, which can be handled using standard procedures. Its...
We investigate the p-percent coverage problem in this paper and propose two algorithms to prolong network lifetime based on the fact that for some applications full coverage is not necessary and different subareas of the monitored area may have different coverage requirements. The first algorithm, CPCA, is a centralized algorithm which selects the least number of nodes to monitor p-percent of the...
Wireless sensors are increasingly adopted in manufacturing and vehicular systems for monitoring critical components under continuous operation. Many such components move rapidly and frequently in metallic containments with challenging radio propagation characteristics. For wireless sensors mounted on rotating structures, previous studies identified an eminent increase in packet transmission errors...
Either as a significant augmentation of GPS system, or as an independent system for indoor positioning, pseudolites augmenting GPS technique has become an exciting technology whose potential can be explored for a wide range of positioning and navigation application. Indoor positioning using multiple pseudolites signals, however, comes up against a number of obstacles, and there are some challenging...
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