Royal Institute and Observatory of the Spanish Navy

About: Royal Institute and Observatory of the Spanish Navy is a facility organization based out in San Fernando, Spain. It is known for research contribution in the topics: Gamma-ray burst & Magnetic anomaly. The organization has 50 authors who have published 106 publications receiving 2565 citations. The organization is also known as: Instituto y Observatorio de Marina de San Fernando.

A contribution for the improvement of GPS CV time transfer technique

Abstract: Most of the GPS links between timing laboratories that contribute to TAI are performed by single channel GPS timing receivers. These are based in the original NBS and JPL designs, and can perform and store 48 tracks per day. We have increased the numbers of tracks per day using an external computer so reaching the maximum of 91 tracks. We are now able to follow the GPS schedule issued by BIPM and fill up all the gaps between tracks selecting additional satellites. In this paper we are exposing the studies done after an experience using a common clock link at our site and the results on the remote calibration of a time standard. It also contains a study of the impact of the increasing of the data per day in the uncertainty of the comparison using GPS CV technique. Finally, a comparison with a multi-channel GPS receiver is also detailed.

Absolute frequency measurement of the 171 Yb optical lattice clock at INRIM

Abstract: We present the absolute frequency measurement of the transition 1S 0 – 3P 0 at 578 nm in ytterbium 171 realized in an optical lattice frequency standard relative to the cryogenic caesium fountain ITCsF2. The measurement result is 518 295 836 590 863.59(31) Hz with a relative standard uncertainty of 5.9 × 10−16. A contribution of 1.6 × 10−16 is coming from the ytterbium clock and we are working to reduce this contribution to the 1 × 10−17 level.

Optical reference frame defined by Carlsberg Meridian Catalogue La Palma Number 4

Abstract: The contribution of the Carlsberg Meridian Catalogue La Palma Number 4 to the determination of the optical reference frame is discussed. This catalogue of almost 51000 stars provides one of the most accurate optical reference frames at the present epoch, having a density of 1 star per square degree, and an average accuracy of 0.″12 in position and 0.″003 per year in proper motion for stars with V 11 in the fields of benchmark extragalactic radio sources which can be used in linking the optical reference frame defined by the FK5 to the extragalactic frame.