Abstract The positioning accuracy of global navigation satellite system receivers is frequently degraded in urban areas due to reflected signals. A moving receiver faces additional challenges because it needs adjust changes the statuses signals received, including line-of-sight (LOS), multipath, non-LOS, or invisible. This paper proposes two new algorithms that can be used enhance a re...

Trilateration is a technique for position estimation from range measurements which is often used in robot navigation. Most applications assume that there is no error associated with the landmarks used for trilateration. In cooperative navigation, in which groups of robots use each other as mobile beacons for position estimation, it is imperative to take the uncertainty in the beacon position in...

We propose a method that finds the position and orientation of an acoustic source in an enclosed environment. For each of eight T-shaped arrays forming a microphone array network, the time delay of arrival (TDOA) of signals from microphone pairs, a source position candidate, and energy related features are estimated. These form the input for artificial neural networks (ANNs), the purpose of whi...

Here we examined ocular pursuit and spatial estimation in a linear prediction motion task that emphasized extrapolation of occluded accelerative object motion. Results from the ocular response up to occlusion showed that there was evidence in the eye position, velocity and acceleration data that participants were attempting to pursue the moving object in accord with the veridical motion propert...

BACKGROUND Freezing of gait (FoG) is one of the most disturbing and least understood symptoms in Parkinson disease (PD). Although the majority of existing assistive systems assume accurate detections of FoG episodes, the detection itself is still an open problem. The specificity of FoG is its dependency on the context of a patient, such as the current location or activity. Knowing the patient's...