Methods and systems are provided for using base-station location to assist mobile-device system acquisition. The distance measuring device measures the space between a plurality of measuring points from the measuring site and, based on this, determines the spatial alignment of the respective heliostat. The control unit is programmed to deliver the throttle-up signal to the throttle actuator when the sensor of clutch status indicates that a change in clutch status from engaged to non-engaged, and the gear sensor indicates that the vehicle is in first gear. A CA code continuous tracking GPS receiver is used to produce GPS positioning fixes and real-time L1 carrier phase measurements. Analog signals acquired in the first and second photo sensing means of one pair or of adjacent pairs are present at the floating sensing point in response to the enabling of the first or second control lines, respectively.