Ryuichi Ichikawa

发表

The effect of neglecting VLBI reference station clock-offsets on UT1 estimates

Thomas Hobiger, Yasuhiro Koyama, Johannes Boehm, 2009 .

Recent VLBI activities at the Communications Research Laboratory, Japan.

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 1999 .

Computation of Troposphere Slant Delays on a GPU

Thomas Hobiger, Yasuhiro Koyama, Tetsuro Kondo, 2009, IEEE Transactions on Geoscience and Remote Sensing.

Near-Real-Time GPS PPP for Time and Frequency Transfer

Ryuichi Ichikawa, Tadahiro Gotoh, Hiroshi Takiguchi, 2016 .

Activity Report from NICT

Ryuichi Ichikawa, Tadahiro Gotoh, Tsukasa Iwama, 2012 .

Atmospheric Delay Reduction Using KARAT for GPS Analysis and Implications for VLBI

Thomas Hobiger, Tetsuro Kondo, Ryuichi Ichikawa, 2010 .

Ray-traced troposphere slant delays for precise point positioning

Thomas Hobiger, Yasuhiro Koyama, Tetsuro Kondo, 2008 .

Comparison of Processing Strategy for Time and Frequency Transfer Using GNSS

Ryuichi Ichikawa, Tadahiro Goto, Jun Amagai, 2019 .

Comparison of Ray-Tracing Packages for Troposphere Delays

Harald Schuh, Thomas Hobiger, Ryuichi Ichikawa, 2012, IEEE Transactions on Geoscience and Remote Sensing.

Overall Activities of Time and Frequency Metrology in NICT

Ryuichi Ichikawa, Mamoru Sekido, Tetsuya Ido, 2021 .

Global Positioning System Project to improve Japanese Weather, earthquake predictions

Ryuichi Ichikawa, Isao Naito, S. Shimada, 1998 .

VLBI Measurements for Frequency Transfer

Thomas Hobiger, Yasuhiro Koyama, Ryuichi Ichikawa, 2009, Proceedings of the International Astronomical Union.

Statistical Study on Precipitable Water Content Variations Observed with Ground-Based Microwave Radiometers

Ryuichi Ichikawa, Kazumasa Aonashi, Yoshinori Shoji, 2004 .

Multi-technique comparison of troposphere zenith delays and gradients during CONT08

Peter Steigenberger, Harald Schuh, Thomas Hobiger, 2011 .

Are numerical weather model outputs helpful to reduce tropospheric delay signals in InSAR data?

Thomas Hobiger, Ryuichi Ichikawa, Masato Furuya, 2013, Journal of Geodesy.

Recent achievements in very long baseline interferometry.

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 1999 .

Tsukuba GPS Dense Net Campaign Observation: Improvement in GPS Analysis of Slant Path Delay by Stacking One-way Postfit Phase Residuals

Ryuichi Ichikawa, Hajime Nakamura, Kazumasa Aonashi, 2004 .

Development of the K5/VSSP System

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 2008 .

Development of a 4 gbps multifunctional very long baseline interferometry data acquisition system

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 2006 .

On the importance of accurately ray-traced troposphere corrections for Interferometric SAR data

Thomas Hobiger, Yasuhiro Koyama, Tetsuro Kondo, 2010 .

High-order Sampling Techniques of Aliased Signals for Very Long Baseline Interferometry

Tetsuro Kondo, Ryuichi Ichikawa, Mamoru Sekido, 2012 .

An Evaluation of the practicability of current mapping functions using ray-traced delays from JMA Mesoscale Numerical Weather Data

Thomas Hobiger, Yasuhiro Koyama, Ryuichi Ichikawa, 2008 .

Development of a compact VLBI system for a length examination of a reference baseline

Yasuhiro Koyama, Ryuichi Ichikawa, Junichi Nakajima, .

Evaluation of repeatability of baseline lengths in the VLBI network around the Tokyo metropolitan area

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 1998 .

An Evaluation of VLBI Observations for the Deep Space Tracking of the Interplanetary Spacecrafts

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 2004 .

Status report on VLBI application for space navigation of Hayabusa

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 2006 .

VLBI Observation of Spacecraft for Navigation –Approaches with Group Delay and Phase Delay –

Yasuhiro Koyama, Tetsuro Kondo, Ryuichi Ichikawa, 2005 .