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In wireless sensor networks (WSN), location information acquisition is critical to guarantee their performance. This paper presents a hybrid positioning method in WSN with high precision. Reference nodes transmit linear frequency modulation continuous wave (FMCW), general nodes estimate the range difference to reference nodes based on the received signals' frequency difference. The location information...
In a cellular system, Multiple-Input/Multiple-Output (MIMO) technique increases the number of links for not only spatially multiplexing data to transmit/receive but also measuring the distance between a base station (BS) and a mobile station (MS) at the same time. Therefore, if the MIMO technique is applied to a system-based location estimation, it must improve the accuracy of location estimate. This...
This article proposes a set of strategies to improve the performance stability and reliability of purely software ToA-based ranging with off-the-shelf WLAN equipment. Taking as starting point the core design lines proposed in, where timing measurements were taken at OS level using the CPU clock of the client device, we optimize the OS configuration and the capture of the time-stamps. Results obtained...
A novel method of maneuvering target location by single station with radio signal is proposed in this paper. Firstly, based on the measurement of Time Difference of Arrival (TDOA) and the Direction of Arrival (DOA) of the non-cooperative FM radio illuminators, the maneuvering model and the measurement equation are built. Secondly, the Maximum-Likelihood Estimate Interacting Multiple-Model (MLE-IMM)...
The paper is discussing some aspects of providing location in wireless ISM bands networks. Particularly, the focus is on precision time stamping of messages needed to compute the location based on the information about time difference of arrival of signal from a mobile node to multiple fixed nodes with known positions. After presenting the particularities of such networks that influence ranging, solutions...
In wireless sensor networks (WSN), location information acquisition is critical to guarantee their performance. This paper presents the positioning methods in WSN with based on the linear frequency modulation continuous wave (FMCW) techniques. Reference nodes with known locations transmit linear FMCW reference signals, while other sensor nodes estimate their locations based on the time frequency difference...
In a wireless channel with a large delay spread, a detection probability of conventional TDoA (Time Difference of Arrival) positioning algorithms cannot satisfy the U.S. E-911 (Enhanced-911) standard. In this paper, we propose an improved TDoA-based tracking algorithm for mobile-WiMAX (Worldwide Interoperability for Microwave Access) systems. The position of a MS (Mobile Station) is estimated by the...
Combining with UWB location technology, TOA location algorithm is presented. The first step is statistically averaging the received signals to mitigate impact of AWGN as long as possible. Using incoherent power detection algorithm obtain rude TOA estimation which is made incoherent power detection once more in the second step so as to further optimize in time. The simulation results show that the...
UWB technology is especially suitable for location and tracking applications due to its high bandwidth, which allows a great accuracy on Time Of Arrival (TOA) estimation. Nevertheless, the achievement of this goal on multipath environments requires the design of efficient detection algorithms. The main objective of this paper is to compare and to provide a qualitative and quantitative evaluation of...
This paper discusses an improved method for location in CDMA based cellular communication system. The Time Difference of Arrival (TDOA) technique is one of the most promising location techniques for cellular communication system. This technique is based on estimating the difference in the arrival time of the signal from the source at multiple receivers. In digital communication systems, a repeater...
We propose a high-accuracy, low-cost UWB-IR wireless location system based on the quasi TDOA method. The system consists of anchor nodes, a synch node and a location server. The anchor nodes synchronize each other as regulated by the synch node so that synchronization is always precise in the location process. To make the anchor node simple, the location system uses acquisition and tracking functions...
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