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- W619255725 abstract "A prototype Automatic Position and Control (APAC) system is being developed for use in position sensitive construction processes. The system provides three dimensional location information within the construction site. The three dimensional data from the system is available in near real time as input to a CAD database of the construction project. The vehicle to be located is equipped with a spread spectrum beacon transmitter and its position is found using a hyperbolic phase ranging system. Laboratory and field tests have shown that multipath interference is the primary limitation on system accuracy. Several methods of improving the accuracy of the system in the presence of multipath interference have been investigated. A computer simulator has been developed using Monte Carlo analysis to predict system error performance and thus evaluate the effectiveness of various multipath defeating techniques. Antenna diversity and receiver diversity have been found to dramatically improve the overall accuracy. Weighting techniques are used to reject data contaminated with large multipath errors." @default.
- W619255725 created "2016-06-24" @default.
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- W619255725 date "1989-09-01" @default.
- W619255725 modified "2023-09-23" @default.
- W619255725 title "A PRECISION AUTOMATIC VEHICLE LOCATION SYSTEM FOR USE IN CONSTRUCTION AUTOMATION. IN: CONFERENCE RECORD OF PAPERS PRESENTED AT THE FIRST VEHICLE NAVIGATION AND INFORMATION SYSTEMS CONFERENCE, TORONTO, ONTARIO, CANADA - SEPTEMBER 11-13, 1989" @default.
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