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Search Results for Collection: School of Computing and Mathematical Sciences
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(Terra Scientific Pub. Co., AUT University; 2008)The latency of UT1 measurement with Very Long Baseline Interferometry (VLBI) has been greatly reduced by using e-VLBI technology. VLBI observations on the baseline formed by the Kashima 34-m and the Onsala 20-m radio ... -
(AUT University, Japan Society of Applied Physics (JSAP); 2008)原子泉型周波数標準器及び光周波数標準器の開発が世界各国で進められているが，このような 高精度の周波数標準器を比較する新しい時刻比較技術の開発も必要である．宇宙測地技術のひ とつであるVLBI は，遥か彼方の天体から放射される電波を，複数のアンテナで受信し，その 到達時間の差(遅延時間)を精密に計測している．解析では，遅延時間を各種物理パラメータと， 局の位置，速度，大気遅延と共に，基準局に対する観測局のクロックオフセットを未知パラメ ... -
(AUT University, National Institute of Information and Communications Technology (NIICT); 2008)We compare the frequency transfer pre- cision between VLBI and GPS carrier phase using IVS and IGS observation data in order to confirm the potential of VLBI time and frequency transfer. The results show that VLBI time ... -
(AUT University, TerraPub; 2006)We analyzed continuous GPS data from more than 20 sites in Asia, Australia and islands in Indian Ocean in order to detect crustal deformations associated with the Sumatra-Andaman earthquake of December 26, 2004. Coseismic ... -
(AUT University, American Geophysical Union; 2007)In the usual geodetic VLBI analysis, clock offsets and their rates of change at participating stations except for the reference station are estimated. The averaged formal error (1σ) of the clock offsets is typically about ... -
(AUT University; 2008)We compare the frequency transfer precision between VLBI and GPS carrier phase using IVS and IGS observation data in order to confirm the potential of VLBI time and frequency transfer. The results of the VLBI frequency ... -
(AUT University, Japan Geoscience Union; 2007)No abstract -
(AUT University, Japan Geoscience Union; 2008)Modern cold-atom-based frequency standards have already archived the uncertainty of 10−15 at a few days. Moreover coldatom- based optical clocks have the potential to realize the uncertainty of from 10−16 to 10−17 level ... -
(AUT University, American Geophysical Union; 2006)Temporal change of surface loadings due to the mass redistribution of the fluid envelope of the Earth, deform the Earth and cause the coordinate changes of the observation sites. We estimated the crustal displacements due ... -
(AUT University, Asia Oceania Geosciences Society (AOGS); 2011)Though the New Zealand Geodetic Datum 2000 (NZGD2000) is based on and closely matches the International Terrestrial Reference System (ITRS) through the International Terrestrial Reference Frame (ITRF), it is not a dynamic ...