Resource-Adaptive Personal Navigation

Abstract

personal navigation system REAL integrates the indoor and outdoor environment into a common 3D polygon model. The display on the mobile device adapts to the user's speed (see end of paper). When the user stops moving, the camera zooms in and the halls and the booths are completely labelled. When walking, the camera starts to zoom out of the scene. The second feature is the visualization of the GPS signal accuracy by the radius of the user's standpoint marker. A small marker indicates a precise position, a large marker represents in imprecise position. The necessary change between different positioning technologies such as GPS or GSM/UMTS radio-cell based technologies in an outdoor scenario to the use of infrared and Bluetooth technologies in buildings should remain unnoticed to the user of such a navigation system. 3 types of technical limitations:- quality and precision of the positional information - restrictions of the output medium - restrictions of the graphics generation process Precision of location measurements may vary, different radio cell sizes, GPS visibility, distribution of indoor infrared senders definition of navigation, which consists of two parts (p3): - wayfinding and movement overview of some existing systems 3 classes of resource sensitive processes - resource adapted (optimized in advance) - resource adaptive - resource adapting (handle varying resources restrictions, switch their strategies on a meta cognitive level to comply with different resource situations). include 3 optimization (route selection) criteria for personalized navigation with a PDA - minimize turning points: - minimize complex decision points - maximization of spatial familiarity two kinds of location sensitivity for mobile devices: 1) active location s.: mobile device detects actively the actual location on its own. Puts most of the computational burden on mobile device. 2) passive location s.: the mobile device just passively presents the information that it receives from senders in its local environment present simulation results for trade-off curve between path length and reduction of turning points for Frankfurt Airport some details on rendering map on PDA Alllows orientation of picture with walking direction.