Abstract: According to embodiments, there is provided a mobile digital fluoroscopy system, comprising a mobile unit (1) having: a stand having a G-arm (18) suspended on a chassis frame (7); a first X-ray device (19) mounted on the G-arm (18) to generate X-ray images in a first plane (P1), the first X-ray device (19) having a first receiver (22) mounted on the G-arm (18) and a first transmitter (21) mounted on the G-arm (18) opposite said first receiver (22); a second X-ray device (20) mounted on the G-arm (18) to generate X-ray images in a second plane (P2) intersecting the first plane (P1) of the first X-ray device, the second X-ray device (20) having a second receiver (24) mounted on the G-arm (18) and a second transmitter (23) mounted on the arm (18) opposite said second receiver (24); wherein said first and second receivers (22) and (24) are flat digital X-ray detectors mounted at respective ends of the G-arm.

Abstract: A surveying instrument performs tracking of a target by controlling an orientation of a measuring unit relative to the target in two different angular directions. The control in one angular direction is based on detected light intensities which are modulated according to a first time pattern, and control of the orientation in the other angular direction is based on detected light intensities modulated according to a second time pattern just different from the first time pattern.

Abstract: A surveying instrument performs tracking of a target by controlling an orientation of a measuring unit relative to the target in two different angular directions. The control in one angular direction is based on detected light intensities which are modulated according to a first time pattern, and control of the orientation in the other angular direction is based on detected light intensities modulated according to a second time pattern just different from the first time pattern.