In order to obtain better accuracy and improved flexibility, Topcon introduced what it calls a bar code transmitter for its mm GPS. “Where a normal laser projects a thin horizontal beam, our bar code or fan beam transmitter sends a beam that effectively has a readable height of 10 m,” said Ian Stilgoe, product marketing manager for survey and GPS.

“In normal circumstances a sensor needs to be at the same height as a laser transmitter to pick-up the signal, whereas with the Topcon fan beam there’s a full 10 m of flexibility. With +/- 5 m movement in the vertical plain, this fan beam transmitter lies at the heart of our mm GPS,” said Mr Stilgoe.

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