Joint position and clock estimation is crucial in many wireless sensor network applications, especially distance-based with time-of-arrival (TOA) measurements. In this work, we study the graph properties under which an ultra-wideband (UWB) localizable synchronizable one round TOA-based timestamp A novel rigidity theory proposed its topological condition proved to have close relationship bearing...

Accurate localization has gained significant interest in the field of sensor networks, impulse radio 60GHz signals which is low cost, low complexity are even much more practical for ranging, localization and tracking systems because of the high time and multipath resolution and so on. Typically, accurate Time of Arrival (TOA) estimation of the 60GHz signals is very important. In order to improv...

In line with recent research efforts made to conceive energy saving protocols and algorithms and power sensitive network architectures, in this paper we propose a transmission strategy to minimize the energy consumption in a sensor network when using a localization technique based on the measurement of the strength (RSS) or the time of arrival (TOA) of the received signal. In particular, we fin...

This report presents R2DM (Raw Ranging Data Management) and PDM (Processed Data Management) services. R2DM service is a web service developed for storing, managing and accessing the raw data from indoor localization benchmarking experiments. By raw ranging data we mean the measured physical values used as input for the localization algorithms, such as Angle of Arrival (AoA), Time of Arrival (To...

Improving accuracy in wireless localization and ranging is a challenging task which often demands an increase in the signal-to-noise ratio (SNR). Impulsive ultra-wideband (UWB) technology is a promising signaling alternative that is capable of high-resolution ranging with minimal cost on SNR. Unfortunately, typical UWB time-of-arrival (ToA) estimators are complicated and perform poorly in the l...

Recent advancement in wireless networks and systems has seen the rise of localization techniques as a worthwhile and cost-effective basis for novel services. These location based services (LBSs) have been more and more beneficial and money-making for telecommunications operators and companies. Various LBSs can be offered to the user such as tracking, advertisement, security, and management. Wir...

Accurate localization has gained significant interests in the field of ranging, locating and tracking systems. Impulse Radio (IR) 60GHz signal is practically operated in the literature, because of its high resolution of time and multipath. In order to improve the precision of the Time of Arrival (TOA) estimation, a threshold selection algorithm based on a joint metric of the skewness and kurtos...

In this work we present the personal indoor navigation system based on ranges measurements with Time of Arrival (ToA) principle and Inertial Measurement Unit (IMU). Survey of accuracy improvement approaches including monocular camera Simultaneous Localization an Mapping (SLAM) and WiFi SLAM is provided. Provided experimental results show that integration of data from various navigation systems ...

In this paper, we survey the global positioning system (GPS)-less vehicular localization methods using dedicated short range communication (DSRC). Time of arrival (TOA), which is one of the radio-based ranging techniques, is used in the methods to localize a vehicle. Through the localization methods using DSRC, vehicles can handle GPS error or the situations of no GPS location data when they ar...

Code Division Multiple Access (CDMA) systems and wireless location are studied in this paper. For CDMA systems, Maximal Ratio Combining (MRC) is applied for designing the RAKE receiver, and channel estimation is utilized to determine unknown channel gains. Time of Arrival (TOA) method is presented to estimate user’s location. The improvement on bit error rate (BER) and wireless location using a...