A GPS/INS Aided Video Camera System for Rapid GIS Surveys in Urban Centers

Naser El-Sheimy

Abstract:	This paper assesses the performance of VISAT, a multi- sensor data acquisition system, for Geographic Information System (GIS) applications in urban centers. In this system, developed at the University of Calgary, GPS and INS comprise the positioning and attitude component, while a cluster of Charged-Coupled-Devices (CCD) cameras work as the imaging component ‘Ihe cameras are mounted on a road vehicle moving with a velocity of 50- 60 Km/h. Object coordinates are required with an accuracy of 30 cm for objects within 50 m from the van. The GPS position and velocity will control the INS error propagation, and the high frequency INS positions will bridge GPS outages, correct cycle slips, and give precise interpolation between GPS updates. The updated GPS/lNS information is used to geometrically correct the images collected by the video cameaas. The grabbed video images and the output of the INS system are synchronized by the clock P&e Per Second (PPS) of the GPS receiver. In this paper a brief description of the sensor integration and the essential features of the system design will be giveu. GWINSNideo data collected in the test network of the University of Calgary and in the Calgary down-town areawillbeusedtoassessthefeasibilityofthesystemin terms of accuracy and n%abiity. The concept of using INS positions to detect and fu GPS cycle slips will be investigated using data collected from the university test network where frequent cycle slips occur due to tree coverage. Special emphasis will be given to the GPS peafomun~ in the down-town area and the effectiveness of INS bridging in this case.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	1357 - 1366
Cite this article:	El-Sheimy, Naser, "A GPS/INS Aided Video Camera System for Rapid GIS Surveys in Urban Centers," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 1357-1366.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In