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RFID-based indoor location systems have been proved to be both accurate and cost-effective. However, current implementations mainly use active tags which suffer the issues of batteries replacement, installation, maintenance and per-unit cost. Besides, as the number of users grows, how to guarantee the stability and high speed transmission of the location information can be challenging. To address...
An RF ranging sensor based on time-interleaved Dual Frequency Continuous Wave (DFCW) radar is proposed to measure the absolute distance between two shoes to aid a dead reckoning system for pedestrian navigation. Conventional single frequency Continuous Wave (CW) radar provides accurate but ambiguous range measurement, while DFCW techniques are employed to find the approximate range of the target and...
Inertial Measurement Unit (IMU) based pedestrian navigation systems suffer from long term inaccuracy due to sensor bias drift. Zero velocity update (ZUPT) algorithms can estimate the drift and improve the system accuracy. Accurate zero velocity period detection is critical for the performance of ZUPT algorithms. A low power shoe-embedded RF sensor is proposed to identify zero velocity periods of a...
A new range-free solution based on simple RSSI measurements is presented herein. The proposed method includes a two-stage algorithm and is able to incorporate fingerprints of specific locations, when available, in order to enhance localization accuracy. The proposed algorithm requires a strategic placement of nodes in each room while being easily scalable to a large number of rooms and adaptable to...
It has been known that CSS-based IEEE 802.15.4a RF module can provide a relatively desirable level of ranging accuracy. It actually exploits a ranging technique called SDSTWR (Symmetric Double-Sided Two-Way Ranging). Meanwhile, many research efforts have been made to devise efficient range-based indoor localization techniques. Of these, trilateration has been one of the most widely used localization...
AUVs have proved robustness and high performance in applications including naval mine counter measures, marine research and deep water offshore oil and gas surveys. A next step is to introduce AUVs to under ice geophysical surveys. A main challenge for regular under ice operations is to handle the risk of a loss of a vehicle, or long operational interruptions. The paper discusses how to reduce this...
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