By D. Angermann, H. Drewes, M. Gerstl, R. Kelm, M. Krügel, B. Meisel (auth.), Prof. Dr. Fernando Sansò (eds.)
Every 4 years the overseas organization of Geodesy meets on the IUGG basic meeting and this has continuously been an incredible occasion for IAG to make the purpose on the place are we going as geodesists either when it comes to medical creation in addition to when it comes to association. The complaints of IAG on the Sapporo 2003 basic meeting are the reflect of our medical achievements, and, as Geodesy is a residing entity like all different technological know-how, let's imagine it's a technique to see the image of what we contemplate our box of purposes in addition to of theoretical speculations. allow us to learn this element by way of what are: the item of our examine, the equipment we use, the final medical effects we will produce. • Our item: right here i need to exploit a pseudo-Helmert definition; the article of Geodesy is understanding the surfaces of the earth: the geometric floor by way of positioning and e.m. surveying, and the actual floor, i.e the gravity box, through land, marine or satellite tv for pc gravimetry, and their time adaptations. This "object" is of course interlaced with different actual homes of the earth either via deep techniques affecting its floor and during the gravity box in any respect varied scales from the worldwide to the neighborhood and native, the place such a lot engineering purposes take place.
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Additional resources for A Window on the Future of Geodesy: Proceedings of the International Association of Geodesy IAG General Assembly Sapporo, Japan June 30 – July 11, 2003
Three mm zero-length repeatability was very reasonable value comparing with the about 1 mm of horizontal components repeatability in the recent state of the art, and improved the effectiveness of the antenna grouping approach to cancel out the antenna phase center variations. A zero-length repeatability and baseline length dependency of vertical component would be worse in the mountainous inland Japanese islands than in Tsukuba campaign sites located in a relatively flat terrain. We need to reduce both the zero-length repeatability and the baseline length dependency.
The GPS data were analyzed using the GAMIT/GLOBK software, following the procedure mentioned in Dong et al. (1998). , 2001). 1 N- • A • 40 A 16 * 60- H j l 40 • . 4? « A . 2E Fig. 1. Location of the GPS receiver sites in the Tsukuba 2000 dense network campaign. Small closed circles - Trimble receiver, large closed circles - Ashtech receiver equipped with Choke ring antenna, closed squares - Ashtech receiver equipped with micro-strip antenna. Open triangle and square - surface meteorological measurements.
17fjpm x L 250 Fig. 6. Time variations of the vertical component with reference to the GM35 site locating at the central area of the network in the Tsukuba 2001 dense network campaign. 1 0 5 10 15 20 BASELINE LENGTH (KM) 25 Fig. 7. Baseline length versus repeatability of the vertical component of the all baseline vectors among the Tsukuba 2001 dense network campaign sites. will be possibly improved by removing multipath by way of hardware, receiver firmware and software. Recent advancement of the receiver firmware with the choke ring antennas may contribute to the reduction of the multipath effect on the precise positioning.