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What algorithm can I use for constructing a map of an explored area using a number of ultrasound sensors?

Ultrasound sensors are incredibly cheap these days which makes them a popular choice for many hobbyist robotic applications, and I'd like to use a bunch of them (say 10) around a robot with an algorithm to build a rough map of an area (as the robot explores it.) I'm not interested in dealing with moving objects at this stage, just pinpointing stationary ones, and I'll be using GPS for location. I realise that other components such as a laser scanner would produce much more accurate results, however such devices are also astronomically more expensive.

Does an algorithm exist for this purpose?