A Highly Stable Crystal Oscillator Applied to Geodetic VLBI Experiment

• Main Authors: Kiuchi, Hitoshi, Amagai, Jun
• Other Authors: COMMUNICATIONS RESEARCH LAB TOKYO (JAPAN)
• Format: Text
• Language: English
• Published: 1990
• Subjects: Lasers and Masers; *MASERS; CESIUM; RANGE FINDING; CRYSTAL OSCILLATORS; PHASE LOCKED SYSTEMS; FREQUENCY STANDARDS; STABILITY; Antarc*; Antarctica
• Online Access: http://www.dtic.mil/docs/citations/ADA519486; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA519486

Instead of a hydrogen maser, a carefully selected Crystal oscillator which is phase locked to a Cesium (Cs) frequency standard for time range of more than 100 seconds is adopted to the time and frequency standard of a geodetic VLBI experiment. The domestic VLBI experiment with 55km baseline using the Crystal oscillator at one end was made in Japan and the obtained error of the baseline vector components were 4cm, and that of the baseline length was 3cm. This system may be operated after only 2 hours warm up. These results coincides with those of conventional geodetic Laser ranging and VLBI using a hydrogen maser within the formal error. A VLBI experiment with over 1000km baselines were carried out successfully from October 1988, and over 11000km baseline bctween Japan and Antarctica was carried out succcssfully in January 1990. See also ADA239372. Presented at the Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting (22nd) held in Vienna, VA on 4-6 December 1990. Published in the Proceedings of the Annual Precise Time and Time Interval (PTTI) Applications and Planning Meeting (22nd), p131-143, December 1990.