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By using the Time-Difference-of-Arrival (TDOA) of UWB-IR waveforms at multiple antennas, the position of a transmitting tag can be accurately estimated for high precision positioning applications. Several methods can be used to obtain the TDOA information based on the knowledge of the received waveforms at the antennas. The performance of the various methods however depend on the quality of the received...
This paper proposes a simple, low cost method of maintaining the output transmission levels of a UWB pulse generator within a stipulated emission mask at different Pulse Repetition Frequencies (PRFs). The circuit is realized using the Step Recovery Diode (SRD) as the pulse generator besides other general components and digital logic circuits. The pulse generator consists of 3 major sections, a selectable...
This paper proposes an efficient algorithm for mitigating problems due to multipath and interference, faced during signal time of arrival estimation in UWB positioning systems. The algorithm first uses time and frequency domain processing to mitigate the effects of interference and noise. It then alleviates the multipath effect via a first arriving pulse detection scheme. The algorithm is verified...
For robots to become more popular for domestic applications, the short comings of current indoor navigation technologies have to be overcome. In this paper we propose the use of UWB-IR for indoor robot navigation. Various parts of an actual implementation of a UWB-IR based robot navigation system such as system architecture, RF sub-system design, antennas and localization algorithms are discussed...
The radiation pattern of the antennas used for the tags and readers in a localization system have a major effect on the system performance. Three combinations of antennas were studied and the results have been presented in this paper. It is shown that an intuitive choice of antennas for the application, based on their radiation patterns, may not always be the right decision. For example, it is shown...
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