Crane Barge Height Limitation Management System

Improving the Safety of Crane Operations

In construction work near airports, height limitation management of crane barge booms is essential to ensure the safety of aircraft.
GPSkySafety is a system that uses a highly accurate RTK-GNSS, and allows crane barge and crane construction operations to be carried out safely.


System Outline

The distance between a GNSS antenna mounted on the tip of a barge crane (or construction crane) and a pre-set restricted area is automatically measured in real time. When known points exist, a GNSS fixed station is installed, and correction waves transmitted by wireless.
When a fixed station cannot be established, it is possible to use a VRS (virtual reference station) and carry out network type RTK-GNSS measurement.
Height and position can be controlled with a precision of less than 2 cm.

On the bridge of the crane barge the current height is displayed visually using special computer software. The ship’s crew members operate the boat and the crane boom while referring to the height and clearance displayed on the computer screen. If the tip of the boom approaches the height of the restricted area, alerts are issued by sound as well as on the screen, calling the situation to the attention of the crew members and supervisors.


*Any NMEA compatible GNSS receiver can be used, irrespective of manufacturer.
*The system can be used both for marine and land construction operations.

System Configuration Example

RTK-GNSS system diagram


Network type RTK-GNSS system diagram