DGPS Correction Data Broadcasting in Japan by MF Marine Radiobeacon and Evaluation of the Positioning Accuracy

Akio Yasuda, Hiromune Namie, Takahiro Yamada, Takuya Takahashi, Morihiro Takayama

Abstract:	In Japan test transmission of DGPS correction data (Type-l message at the moment, to be shified to Type-9 in the regular operation) has been carried out since December 1995. The data are sent from MF marine radiobeacon stations at Turugi-saki Point (35’08’N, 139’4O’E) and Daioh-saki Point (34’16’N, 136’54’E). Their output power and the transmission rate are 130 W and 200 bps, respectively. The radiobeacon covers 200 km in radius. We tried positioning at a fixed point in Tokyo University of Mercantile Marine every second for one hour in the daytime, simultaneously with and without taking DGPS correction data from the beacon station at Turugi-saki Point. The distance between the two points is about 60 km. The 2 dims reduces greatly from 24 m without correction to 1.4 m with correction, although data reception rate remains less than 50 %. It was also continned that correction data horn both stations are available on the observation ship inside their area in the daytime. But at night the service area of Turugi-saki station narrows to about 150 km probably due to the interference of sky wave transmission from another station of the same frequency at Toi-misaki, about 800 km away on the ocean, Next we observed the reception rate of data on a vessel in Tokyo and Sagami Bays, within the circle of 50 km from Turugi-saki station. The observation shows the rate to be more than 99 %. The maximum duration of the failed reception is 29.4 s, short enough to make it possible to obtain an accurate positioning by DGPS for maritime uses. The authors also tried receiving correction data by land in the urban area of Tokyo and its environs about 50 km away from Turugi-saki station. The data were acquired on an ordinary passenger car running along the streets. A fairly good reception was ascertained except along a street surrounded by tall buildings. So they are expected to be applicable to car navigation sets which have recently come into wide use in Japan. They work effectively with the assist of INS, only if correct positions can be obtained every few minutes.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	385 - 392
Cite this article:	Yasuda, Akio, Namie, Hiromune, Yamada, Takahiro, Takahashi, Takuya, Takayama, Morihiro, "DGPS Correction Data Broadcasting in Japan by MF Marine Radiobeacon and Evaluation of the Positioning Accuracy," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 385-392.
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