title: Portable microwave frequency dissemination in free space and implications on ground-to-satellite synchronization.
abstract: Frequency dissemination and synchronization in free space play an important role in global navigation satellite system, radio astronomy, and synthetic aperture radar. In this paper, we demonstrated a portable radio frequency dissemination scheme via free space using microwave antennas. The setup has a good environment adaptability and high dissemination stability. The frequency signal was disseminated at different distances ranging from 10 to 640 m with a fixed 10 Hz locking bandwidth, and the scaling law of dissemination stability on distance and averaging time was discussed. The preliminary extrapolation shows that the dissemination stability may reach 1 × 10(-12)/s in ground-to-satellite synchronization, which far exceeds all present methods, and is worthy for further study.
authors.affiliation: Joint Institute for Measurement Science, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
authors.forename: J
authors.initials: J
authors.lastname: Miao
authors.affiliation: Joint Institute for Measurement Science, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
authors.forename: B
authors.initials: B
authors.lastname: Wang
authors.affiliation: Joint Institute for Measurement Science, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
authors.forename: Y
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Joint Institute for Measurement Science, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
authors.forename: Y B
authors.initials: YB
authors.lastname: Yuan
authors.affiliation: Joint Institute for Measurement Science, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
authors.forename: C
authors.initials: C
authors.lastname: Gao
authors.affiliation: Joint Institute for Measurement Science, Department of Precision Instrument, Tsinghua University, Beijing 100084, China.
authors.forename: L J
authors.initials: LJ
authors.lastname: Wang