I.Prochazka, Tech.Univ.Munich, Germany.October 27, 2008 Gaining confidence – Breadboard demo, Prague n The entire Time transfer experiment may be carried out in our lab to demonstrate the feasibility of the proposed project n GROUND segment u LaserHamamatsu diode, 42 ps, 10 Hz, 778 nm u SLR detectorSPAD standard detector package u SLR timing HP5370B, 50 ps resolution u Time base GPS timing system, 10 MHz, 10pps n SPACE segment u Satellite retroplastic retroreflector, range m u Optical receiverSPAD standard detector package u Timing Event timing 150 ps resolution u Time basestandard quartz oscillator 10MHz n RESULTS u Satellite range u Space / ground time base difference u Demonstration of basic principles

I.Prochazka, Tech.Univ.Munich, Germany.October 27, 2008 Breadboard demo, Prague - setup n SPACE SEGMENT n Optical detector package+electronics n Retro-reflector array n Optical detector input aperture n Space segment motion range n GROUND SEGMENT n Laser transmitter / diode n Ranging optics and detector package

I.Prochazka, Tech.Univ.Munich, Germany.October 27, 2008 Breadboard demo, Prague – Resuls # 1 Laser ranging Range shift +16o mm / ns Data stability & reproducibility & consistency 10 psec Series meas. each RMS ~ 100 ps 20 Hz rate, data yield ~ 5% Ranging data histogram Note the high photon flux background

I.Prochazka, Tech.Univ.Munich, Germany.October 27, 2008 Breadboard demo, Prague – Resuls # 2 Time comparison “Ground” “Space” equal frequency on both terminals Series 150 meas. each RMS ~ 500 ps 20 Hz rate, data yield 5%~ 12% Result impaired by limited Resolution and stability of event timing On “space segment”

I.Prochazka, Tech.Univ.Munich, Germany.October 27, 2008 Breadboard demo, Prague Results Summary n The Laser Time Time transfer experiment was demonstrated in a indoor environment to demonstrate the feasibility of the proposed project n For demo purposes, modest performance epoch timing device was used for time transfer n DEMONSTRATED u Laser ranging resolution, consistency & stability better than 10 ps, u Ranging performed for different ranges u Time comparison using laser pulses u Frequency comparison using laser pulses n SUMMARY & CONCLUSION 1. Performance of the indoor time & frequency transfer corresponds to the components involved 2. The precision and accuracy of ~ 10 ps of the LTT is achievable using proposed solution for ACES upgrade