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Search Results for Collection: School of Computing and Mathematical Sciences
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(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, 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, National Institute of Information and Communications Technology (NIICT); 2009)To show the frequency stability of local baseline, we carried out long term VLBI experi- ment together with GPS and DMTD measurement. And, we compared the results provided from these three techniques. The results are ... -
(AUT University, National Institute of Information and Communications Technology (NIICT); 2007)To compare the results with Global Po- sitioning System (GPS) Time Transfer and Very Long Baseline Interferometry (VLBI) Time Trans- fer, we carried out the geodetic VLBI experi- ments for four times. The averaged formal ... -
(AUT University, The Geodetic Society of Japan; 2007)No abstract. -
(AUT University, European Frequency and Time Forum; 2008)Modern cold-atom-based frequency standards have already archived the uncertainty of 10-15at a few days. Moreover cold-atom-based optical clocks have the potential to realize the uncertainty of from 10-16 to 10-17 level ...