National Repository of Grey Literature 15 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
Time and frequency transfer in all-optical network
Smotlacha, V. ; Kuna, Alexander
This paper describes usage of all-optical network for time metrology application - Time and frequency transfer between two geographically distant sites. Although several approaches exist, there is no production implementation yet. Our method is based on newly developed adapters utilizing channels in a DWDM (Dense Wavelength-Division Multiplexing) network. We present results of tests performed in real production all-optical network including the time transfer between atomic clocks in Prague and Vienna over more than 500 km long optical path
Time and Frequency Transfer Using Satellite Based Augmentation System GAGAN
Pánek, Petr ; Kuna, Alexander
Aided Geo Augmented Navigation) is an Indian SBAS (Satellite Based Augmentation Systems). In contrast to the European EGNOS, this system already supports the navigation function and it transmits signals both in L1 and L5 frequency channels. We used the GAGAN signals for an experimental common-view time transfer between IPE Prague and PTB Braunschweig which is a distance of 370 km and we also tested the time transfer properties using a single clock common-view. The L1 and ionosphere-free code measurements have markedly lower accuracy compared to a GPS common-view because of rather narrow bandwidth of the SBAS signal in L1 frequency channel. L5 code measurement provides much better precision. It results from the single clock common-view that the observed fluctuations can be described as white noise with standard deviations of 6 ns, 1.3 ns and 14 ns for L1, L5 and ionosphere-free combination. The results obtained from the carrier phase measurements are promising. The single clock common-view precision was approximately 30 ps RMS even for the ionosphere-free combination.
Evaluation of the accuracy of the method for measuring state-of-the-art ultra-high stability quartz crystal oscillators
Salzenstein, P. ; Kuna, Alexander ; Lefebvre, F.
The accuracy of the Three-Cornered Hat method is discussed when not simultaneously applied to the determination of the contribution on short term frequency stability performed on ultra-stable quartz oscillators
Optical infrastructure for time and frequency transfer
Smotlacha, V. ; Vojtěch, J. ; Kuna, Alexander
The paper describes optical infrastructure for time and frequency transfer in the Czech republic. The infrastructure is heterogeneous and utilises resources of the Czech academic optical network. It allows to interconnect Cesium standards in distant sites with the national time and frequency laboratory and to distribute accurate time and stable frequency. We also present results and compare them with other methods of time transfer
2007 Program of Metrology Development. Report on Project III/13/07 "Development of time and frequency calibrations"
Čermák, Jan ; Čemusová, Blanka ; Kuna, Alexander ; Pánek, Petr ; Šojdr, Ludvík
This final report gives a summary of the result obtained in time and frequency calibrations at the Laboratory of the National Time and Frequency Standard at the Institute of Photonics and Electronics within the Project III/13/07 of the Program of Metrology Development. The results concern a) calibration of GPS disciplined time and frequency standards, b) background instability of the measurement system based on dual-mixer time-difference multiplication, c) data processing of the GPS time transfer using all-in-view satellites.
Maintaining the National Time and Frequency Standard
Čermák, Jan ; Čemusová, Blanka ; Kuna, Alexander ; Pánek, Petr ; Šojdr, Ludvík ; Klimeš, Pavel
This final report gives a summary of the results obtained in time and frequency metrology at the Laboratory of the National Time and Frequency Standard at the Institute of Photonics and Electronics within the Project II/2/07 of the Program of Metreology Development.
2007 Program of Metrology Development. Progress Report on Project III/13/07 "Development of Time and Frequency Calibrations"
Čermák, Jan ; Čemusová, Blanka ; Šojdr, Ludvík ; Kuna, Alexander ; Pánek, Petr
This progress report gives a summary of the results obtained in time and frequency calibrations at the Laboratory of the National Time and Frequency Standard at the Institute of Photonics and Electronics within the Project III/13/07 of the Program of Metrology Development in the first half of 2007. The results concern a) calibration of GPS disciplined time and frequency standards, b) background instability of the measurement system based on dual-mixer time-difference multiplication, c) data processing of the GPS time transfer using all-in-view satellites.
Program of Metrology Development in 2007. Progress Report on Project II/2/07 "Operation of the National Time and Frequency Standard"
Čermák, Jan ; Čemusová, Blanka ; Šojdr, Ludvík ; Kuna, Alexander ; Pánek, Petr
This progress report gives a summary of the results obtained in time and frequency metrology at the Laboratory of the National Time and Frequency Standard at the Institute of Photonics and Electronics within the Project II/2/07 of the Program of Metrology Development in the first half of 2007.
Program of Metrology Development in 2006 Final report on Project II/2/06: Maintaining the National Time and Frequency Standard
Čermák, Jan ; Čemusová, Blanka ; Kuna, Alexander ; Šojdr, Ludvík ; Klimeš, Pavel ; Pánek, Petr
This report gives a summary of the results obtained in conjuction with maintaining the National Time and Frequency Standard at the Institute of Radio Engineering and Electronics within the II/2/06 Project of the Program of Metrology Development in the year of 2006.
Program of Metrology Development in 2006 Final report on Project III/13/06: Development of the National Time and Frequency Standard
Čermák, Jan ; Čemusová, Blanka ; Šojdr, Ludvík ; Kuna, Alexander ; Pánek, Petr
This report gives a summary of the results obtained in the Laboratory of the National Time and Frequency Standard at the Institute of Radio Engineering and Electronics within the III/13/06 Project of the Program of Metrology Development in the year 2006.

National Repository of Grey Literature : 15 records found   1 - 10next  jump to record:
See also: similar author names
1 Kuna, Aleš
Interested in being notified about new results for this query?
Subscribe to the RSS feed.