The GNSS machine control is a system of control and semi-automated guide of vehicles (bulldozers, power shovels and similar) in building sites, based on GNSS real-time positioning techniques. It permits to strongly increase a machine productivity through a shortening in the execution time and a reduction of the costs for the ground crew (in particular, the surveyors assisting the machine job). An effective machine control system requires a real-time GNSS positioning with a few centimetres accuracy. To obtain such an accuracy, the rover receiver installed on the machine obtains from a fixed receiver of known position (base station) a RTCM correction including code and phase, with the real-time positioning technique commonly referred to as RTK (Real Time Kinematic). The current organization of the GNSS-assisted machine control, even realizing a relevant innovation with respect to the traditional man-assisted way of operating in building sites, still presents some problems and limitations: - costs for the GNSS base station; - communication problems between base station and rover on the machine, commonly based on modems, which in countries like Italy are subjected to strong power restrictions; - affordability and integrity problems for the correction data coming from one station only. The use of a networked real-time kinematic positioning system (NRTK) permits to eliminate most of the problems summarized above. The base station is no more necessary, the communication and the position solution are more stable and affordable. The paper presents an application of NRTK services to the machine control, tested in building sites covered by the permanent network GPSUMBRIA, currently operated by the DICA. The GNSS system installed on the test machines was not able to receive NRTK corrections, but only single station RTCM data through radios. Therefore, some new hardware components have been specifically set up and tested in order to send network corrections to the rovers mounted on the building machines.
Network Corrections for Machine Control
FASTELLINI, GUIDO;RADICIONI, Fabio;STOPPINI, Aurelio
2009
Abstract
The GNSS machine control is a system of control and semi-automated guide of vehicles (bulldozers, power shovels and similar) in building sites, based on GNSS real-time positioning techniques. It permits to strongly increase a machine productivity through a shortening in the execution time and a reduction of the costs for the ground crew (in particular, the surveyors assisting the machine job). An effective machine control system requires a real-time GNSS positioning with a few centimetres accuracy. To obtain such an accuracy, the rover receiver installed on the machine obtains from a fixed receiver of known position (base station) a RTCM correction including code and phase, with the real-time positioning technique commonly referred to as RTK (Real Time Kinematic). The current organization of the GNSS-assisted machine control, even realizing a relevant innovation with respect to the traditional man-assisted way of operating in building sites, still presents some problems and limitations: - costs for the GNSS base station; - communication problems between base station and rover on the machine, commonly based on modems, which in countries like Italy are subjected to strong power restrictions; - affordability and integrity problems for the correction data coming from one station only. The use of a networked real-time kinematic positioning system (NRTK) permits to eliminate most of the problems summarized above. The base station is no more necessary, the communication and the position solution are more stable and affordable. The paper presents an application of NRTK services to the machine control, tested in building sites covered by the permanent network GPSUMBRIA, currently operated by the DICA. The GNSS system installed on the test machines was not able to receive NRTK corrections, but only single station RTCM data through radios. Therefore, some new hardware components have been specifically set up and tested in order to send network corrections to the rovers mounted on the building machines.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
