Abstract
The new Litton Auto-Surveyor System II (LASS II) was tested during one week on three different test courses, with the inertial surveying system being mounted in a Toyota Land Cruiser. The missions lasted typically 45 minutes and employed 3.5 to 4 minutes ZUPT intervals. Double-run accuracies of ±O.12 m in position and ±O.06 m in height were obtained with the standard protractor offset system. Using a second offset system based on an electronic tacheometer, the longer missions (5.6, 7.6 km) yielded average accuracies of ±O.12 m and ±O.04 m in position and elevation respectively, and the 1.5 km course on campus ±O.06 (position) and ±O.02 (elevation). The only hardware problems experienced relate to on-line recording of data on tape. Malfunctions of the tape recorder caused loss of data in 20 per cent of all missions, either partially or fully.

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