We consider the problem of spatial signal design for multipath-assisted mmWave positioning under limited prior knowledge on user’s location and clock bias. propose an optimal robust and, based low-dimensional precoder structure perfect knowledge, a codebook-based heuristic with optimized beam power allocation. Through numerical results, we characterize different position-error-bound (PEB...

Carrier phase DGPS systems have been increasingly used in airborne surveying. However, the accuracy and availability of GPS positioning cannot meet the stringent requirements of large-scale photogrammetry. Groundbased pseudolites can strengthen the measurement geometry for airborne GPS systems, and improve ambiguity resolution. As a result, positioning accuracy and reliability can be improved, ...

introduction : the dynamic interaction between mother and infant is one of the indicative factors of infants’ social and emotional development especially in stressful situations as cognitive evaluating. methods: an experimental study was completed in 2010 in tehran on a total of 40 infants (18 boys and 22girls) forming two alternative groups and varying in age of infancy (4, 6, 8, 10 and 12 mon...

The positioning of catalytic groups within proteins plays an important role in enzyme catalysis, and here we investigate the positioning of the general base in the enzyme ketosteroid isomerase (KSI). The oxygen atoms of Asp38, the general base in KSI, were previously shown to be involved in anion-aromatic interactions with two neighboring Phe residues. Here we ask whether those interactions are...

Closed reduction and fixation with 3 cannulated screws is a widely accepted surgery for the treatment of femoral neck fractures. However, how to obtain optimal screw placement remains unclear. In the current study, the authors designed a guide pin positioning system for femoral neck fracture cannulated screw fixation and examined its application value by comparing it with freehand guide needle ...