As the only method for all-weather, all-time and long-distance target detection and
recognition, radar has been intensively studied since it was invented, and is considered as …

摘要基于光纤传输的时频同步技术具有高精度, 高稳定性和低损耗的优点. 近年来光纤时频同步
技术发展迅速, 新方法, 新技术和新应用不断涌现, 具有很强的军事应用需求和民用推广前景 …

To significantly improve the frequency references used in radio-astronomy and the precision
measurements in atomic physics, we provide frequency dissemination through a 642-km …

We describe a VLBI experiment in which, for the first time, the clock reference is delivered
from a National Metrology Institute to a radio telescope using a coherent fibre link 550 km …

Abstract The Square Kilometre Array (SKA) project is an international effort to build the
world's largest radio telescope, with a one-square-kilometre collecting area. In addition to its …

Based on the second-order quantum interference between frequency entangled photons
that are generated by parametric down conversion, a quantum strategic algorithm for …

We report the 87 Sr optical lattice clock at NIM with a clock laser referenced to a 30 cm ULE
cavity. Several improvements, such as the atomic temperature and density, the lattice laser …

Aiming at the adverse effects of fiber dispersion over long-distance frequency dissemination,
a dispersion correction scheme based on chirped fiber Bragg grating (CFBG) is proposed …

We demonstrate long-distance (≥ 100-km) synchronization of the phase of a radio-
frequency reference over an optical-fiber network without needing to actively stabilize the …

An optical lattice clock based on 87 Sr is built at National Institute of Metrology (NIM) of
China. The systematic frequency shifts of the clock are evaluated with a total uncertainty of …