Precise Calibration of Pseudolite Positions In Indoor Navigation System

Changdon Kee, Doohee Yun, and Haeyoung Jun, Bradford W. Parkinson, Thomas Lenganstein, and Sam Pullen

Abstract:	Pseudolite is a kind of electronic device, which transmits almost the same signal as GPS satellites except that it is fixed on the ground. The advantage of using pseudolite in outdoor navigation system is an improvement of positioning accuracy and integrity, which is from the augmentation to GPS satellite geometry. Nowadays, one of potential pseudolite application field is the indoor navigation system. As like outdoor navigation system, which uses GPS satellite signals, there are also similar error sources in indoor navigation system, which uses pseudolite. The main error sources are multipath and pseudolite position errors which is similar to the ephemeris error in outdoor navigation system. The pseudolite position error can be eliminated if and only if the positions of pseudolites are exactly calibrated. Otherwise, there will be bias type positioning errors. Therefore, the calibration of pseudolite positions is one of the most critical factors which influence the indoor navigation accuracy. With the above motivation, efforts were made to develop a efficient procedure to calibrate the pseudolite positions precisely for the indoor navigation system. The devloped procedure uses only 5-6 user’s position set, which is optimized for the guessed pseudolite constellation in the calibration loop. So the key point of this procedure is to determine that how many user’s position should be used and where they should be placed. In simulation, we used 6-pseudolite indoor navigation system. And the results show that all the pseudolite positions can be calibrated within 1-2cm if we use the optimized user’s position set.
Published in:	Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999) September 14 - 17, 1999 Nashville, TN
Pages:	1499 - 1508
Cite this article:	Kee, Changdon, Yun, Doohee, Jun, Haeyoung, Parkinson, Bradford W., Lenganstein, Thomas, Pullen, Sam, "Precise Calibration of Pseudolite Positions In Indoor Navigation System," Proceedings of the 12th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1999), Nashville, TN, September 1999, pp. 1499-1508.
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