1 DSN Network e-VLBI Calibration of Earth Orientation L. D. Zhang a,b, A. Steppe a, G. Lanyi a Presentation at 5-th International e-VLBI Workshop Westford,

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1 DSN Network e-VLBI Calibration of Earth Orientation L. D. Zhang a,b, A. Steppe a, G. Lanyi a Presentation at 5-th International e-VLBI Workshop Westford, MA September 19, 2006 a. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California b. Columbus Technologies, Pasadena, California

2 Summary Background: TEMPO –JPL navigation drives requirement of UT1 knowledge –Current tape-based TEMPO meets NAV requirement (Current performance: 5-7 day latency with 1 cm UT1 uncertainty) e-VLBI TEMPO R&D tests –Wide-band VLBI Science Receiver (WVSR) digital recording –DSN T1-line (3 Mbits/s) data transfer –Software correlation –Performed ~ 10 successful tests –UT1 calibration of 1.5 day latency, ~ 1.5 cm uncertainty –Test limitation Conclusion: performance to improve –T3-line to be operational (45 Mbits/s) –Platform upgrade and software automation

3 Background: TEMPO Earth Orientation UTPM –GPS constellation provides continuous polar motion tracking –VLBI remains the best method of calibrating UT1 –Deep space network Goldstone-Madrid baseline suited for measuring UT1 –JPL Time/Earth Motion Precision Observation (TEMPO) bi- weekly VLBI performed on this baseline –JPL deep space navigation drives requirement of real time UT1 knowledge (30 cm) –TEMPO designed to meet this requirement –TEMPO is tape-based

4 Background: TEMPO Facts about current operational TEMPO –TEMPO accurately measures UT1, to ~ 1 cm, at the time of calibration –But latency causes calibration to be less valuable Tape transit time, total turnaround can be up to 7 days UT1 real time knowledge error grows ~ 1 cm / day –Latency is key to improve UT1 real time knowledge Less accurate but quicker turnaround calibration can be better –Recent e-VLBI TEMPO test is designed to leverage existing Delta-e-VLBI (DDOR) infrastructure to obtain EOP data

5 Background: UT1 Knowledge Error Figure: UT1 error predicted by Kalman Earth Orientation Filter (KEOF). The error grows approximately ~ 1 cm per day. At 5 day latency, the knowledge error is ~ 5 cm. (Courtesy of Richard Gross) Current data latency enables ~ 5 cm UT1 real time knowledge error (at time of delivery) Example: a 2 cm calibration accuracy with 1 day latency enables ~ 3 cm UT1 real time knowledge error

6 e-VLBI: WVSR TEMPO Overview Observation sequence design Similar or shorter than TEMPO Digital Recording Instrument –JPL VLBI Science Receiver (VSR) –VSR bandwidth ~ 110 MHz –Wide-band VSR (WVSR) bandwidth ~ 500 MHz –VSR for S-band, WVSR for X-band recording DSN T1-line (3 Mbits/s) data transfer Software correlation on simple Solaris platform (4 processors) Fringe fitting (standard JPL ‘Fit’ code) Parameter estimation (MODEST) Obtain 2-component UTPM calibration Use an equivalent UT1 measurement error  as performance metric

7 e-VLBI: WVSR TEMPO Turnaround WVSR TEMPO R&D test - turnaround time breakdown Number of Scans Experiment Duration (h) T1 Data Transfer (h) 4-Processor Parallel Processing (h) Fringe Fit & Estimation (h) Total Turnaround (day) ~ 20< 10< 3< ~ 36< 17< 3~ 2.5

8 e-VLBI: WVSR TEMPO R&D Tests List of WVSR TEMPO tests recently performed (Exp. time includes time for both experiment setup/teardown and quasar observation) Exp TypeExp Date# of ScansExp. Time (h)UT1 Meas. Err (cm) WVSR TEMPO TEMPO piggyback N/A1.05 TEMPO piggyback N/A1.15 WVSR TEMPO WVSR TEMPO WVSR TEMPO WVSR TEMPO WVSR TEMPO WVSR TEMPO WVSR TEMPO

9 WVSR TEMPO Test Conclusion R&D Test Initial Conclusion scan observation day latency (T1 line) - UT1 measurement error cm (uncertainty ~ 1/sqrt(# of scans)) Compare tape TEMPO - WVSR TEMPO performance comparable - Slight degradation of accuracy when observing time < 3 hours But: e-VLBI has much quicker turnaround e-TEMPO ~ 2 days vs. tape-based TEMPO ~ days Performance of e-TEMPO better than tape-TEMPO better meets NAV requirement with latency improvement

10 Conclusion Current e-VLBI TEMPO limitation –DSN network transfer speed - 3 Mbits/s –# of processors for software correlation –Processing is not automated Coming improvements –DSN T3 line installed - 45 Mbits/s –Platform enhancement (Beowolf cluster bought, can add # of processors) –Software automation planned Future Prospect –Expect better than 1.5 cm accuracy and < 1 day turnaround