Examination of the GPS Receiver for Small Drifting Buoys using QZS

H. Irie, M. Shimada, K. Morishita

Abstract:	The use of GNSS in the marine environment monitoring system is a very effective thing. We reported that a small drifting buoy is available for this purpose. In order to have a good drift characteristic is to reduce the mass of the body of the buoy drift is important. Alternatively, you may need to increase the fluid resistance of the buoy. Buoy has been developed is used for the measurement of rip currents and tidal flow. That is, a small buoy is required that the shape of the container is a small and is waterproof. We have research and development for small buoy for use in a shallow sea. In that environment, miniaturization of the battery power is important. In another wisdom, to reduce the power consumption of the device to be mounted on a buoy is important. There are some methods to lower the consumption electricity of the GPS receiver. Because speed is slow, the current of tide-induced residual may be long for the interval between the GPS measurements. Therefore, the control is effective at ON-OFF interval. In addition, it is necessary for TTFF to be short. Generally, quantity of Doppler shift decreases most when a satellite of GNSS is located near the zenith. Similarly, there is the least quantity of Doppler shift when QZS is located near the zenith. However, the feature of QZS is that time to stay near the zenith is longer than other satellite systems. We hoped that we improved the performance of the buoy by using QZS. We guess that QZS is useful for shortening TTFF.
Published in:	Proceedings of the 2012 International Technical Meeting of The Institute of Navigation January 30 - 1, 2012 Marriott Newport Beach Hotel & Spa Newport Beach, CA
Pages:	1309 - 1338
Cite this article:	Irie, H., Shimada, M., Morishita, K., "Examination of the GPS Receiver for Small Drifting Buoys using QZS," Proceedings of the 2012 International Technical Meeting of The Institute of Navigation, Newport Beach, CA, January 2012, pp. 1309-1338.
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