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Localization is considered as an important parameter in wireless sensor network where it support the node to identify its location so that routing can take place in power efficient way in a dynamic network topology. The issue of localization has been addressed in many research areas such as vehicle navigation systems, virtual reality systems, user localization in wireless sensor networks (WSNs). The...
The universal access transceiver (UAT) is interesting as an alternative pseudolite because pseudoranging is available using ground segment messages. However, there is a limitation that accurate ranging is not supported when the user altitude is low, because of geometrical and multipath effects. In this study, we investigated the application of the airborne relay-based positioning system (ARPS) to...
Goal-seeking and information-seeking are canonical problems in mobile agent swarms. We study the problem of collaborative goal-approaching under uncertain agent position information from a signal processing perspective. We propose a framework that establishes location-aware formations, resulting in a controller that accounts for agent position uncertainty with a realistic ranging model. Simulation...
Automated age estimation from facial images has recently drawn a lot of attention from the research community emerging as a key technology with numerous applications ranging from access control to human machine interaction. In this research study, we explore a vision-based approach for the estimation of age groups from face images. The local binary pattern operator is applied to derive a set of hybrid...
The positioning technology is one of the most important technologies in the wireless sensor network. The paper describes the current international positioning on several existing technologies, including the based ranging RSSI, TOA, TDOA, etc. and non-centroid algorithm based on distance, Amorphous algorithm, APIT algorithm and so on. Dv_Hop algorithm is a distributed localization algorithm based on...
Considering that incremental localization is influenced by the heteroscedasticity problem caused by cumulative errors and the collinearity problem among nodes, this paper has proposed an incremental localization algorithm with consideration to cumulative error and collinearity problem. Using iteratively reweighted method, the algorithm reduces the influences of error accumulation and avoids collinearity...
This paper presents a new approach for reducing the ranging error due to the crystal clock offset. This approach is applicable in cooperative ranging methods like N-Way or Multi-Way ranging, which are mainly used in Wireless Sensor Networks (WSN). Leaving the crystal clock offset error uncompensated leads to propagation of the ranging error through the WSN. In our approach, the crystal clock offset...
Measuring distances accurately can be costly. To overcome complexity and cost of distance measurement equipment modified monocular optical system is proposed which uses only commonly available hardware. Pattern is printed on the marker to improve distance measurement accuracy. Results of simulations of proposed system show two orders of magnitude possible improvement in measurement precision.
The order-of-arrival (OOA) estimation of moving items is essential for various emerging applications, for example, baggage sorting and dispatching in airports. In this paper, we show how OOA estimation can be performed by an UWB-UHF RFID system that allows identification and tracking of passive and semi-passive tags attached to objects moving on a conveyor belt. Particle filtering on the energy samples...
In this paper we consider a time-invariant system of differential equations with an equilibrium. We study the problem of a class of Lyapunov functions allowing to describe an estimation of the domain of attraction (DOA). This work is a development of the results obtained by V. I. Zubov. The solution of the problem is based on the application of the second method of Lyapunov. An example illustrates...
This paper introduces an indoor positioning system which is built with heterogeneous sensors, i.e., inertial sensors and ultra wide band (UWB) ranging modules. It takes a hybrid approach with Inertial Navigation and UWB ranging method to explore their cooperative efforts. Besides, a novel hybrid algorithm for single-anchor positioning and calibration is proposed, which combines real-time inertial...
Satellite formation flying allows for multiple satellites working together to accomplish the objective of one larger, usually more expensive, satellite. Knowledge of the relative position is required for many formation flying missions. Autonomous relative navigation system based on RF (radio frequency) can be used to acquire such knowledge. Obtaining accurate measurements requires a balanced number...
Wireless location is one of the core technologies of Wireless Sensor Network. In many applications, the accuracy of the location is the precondition of the useful of data information the node collected. Under the premise of cost limits, improving the accuracy of wireless sensor node position has crucial significance. After analyzing reasons of the location weakness of Dv-Distance algorithm due to...
This paper presents an estimation procedure for exploiting multipath signal propagation in shallow water to perform passive ranging. The scenario of interest is a pair of sensors receiving an underwater acoustic signal that has arrived via a bounce from the ocean floor. This approach also applies in other situations, for example, to multiple airborne sensors passively receiving emissions from an airborne...
Cooperative localization (CL) is an efficient way to enhance the position estimate by cooperating among agents, especially under an insufficient signal source situation. To realize CL, a suitable network architecture has to be designed. For the centralized CL, all the information is transmitted to a data center to find a global optimal solution for all the agents. Note that the centralized network...
We consider the problem of precise range estimation between pairs of moving vehicles using periodic broadcast messages. The vehicles are not time synchronized and one needs to explicitly account for the clock offset and clock drift in addition to the vehicle motion to obtain accurate range estimates. We develop a broadcast range estimation algorithm based on local polynomial smoothing of the vehicle...
This paper introduces the coarse time-of-arrival (ToA) estimation in wireless sensor networks (WSN) via orthogonal frequency division multiple access (OFDMA). In the proposed technique, each sensor node exploits a set of orthogonal subcarrier as its allocated signature to respond of the ToA estimation requests transmitted by target nodes. The target node utilizes the orthogonality across sub-carriers...
This paper presents a ranging approach using an improved preamble sequence of orthogonal frequency-division multiplexing (OFDM) signal for 60 GHz system. The performance of range estimation with OFDM modulation under 60GHz channel is analyzed emphatically. In order to utilize the time-frequency characteristics of OFDM signal in the ranging system, the subcarriers phase difference algorithm with an...
A 60 GHz ranging model is established and a strongest path search ranging algorithm based on beamforming is proposed. The range error caused by a non-line of sight (NLOS) channel is mitigated by modeling the corresponding delay bias. Outlier detection is employed to improve the accuracy. Performance results are presented which show that 60 GHz ranging can achieve centimeter level accuracy in indoor...
Positioning awareness has great potential in lot of different field. The basic positioning technique being used in worldwide requires information like anchor nodes location and the distance between anchors to the blind node. This means that ranging technique plays an important role other than known position of anchor nodes in the position estimation accuracy. Doppler ranging technique is a multiple...
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