README.sk
Official plots for SK data group.
Please enter filename, date, your name and description or caption.
Then put files in subdirectory figs/
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Following placed by J. Wilkes, 6/21/99, into figs/gps/:

GPS_tracking.gif
 Histograms of number of satellites in view at one time, at KEK and SK

KEK_gpsblock.gif
 Block diagram of KEK GPS system hardware

KEK_gpstracks.gif
 Sky map of satellite paths observed at KEK, showing blank space due to
North Hall walls

PPS_jitter.gif
 Scope trace showing jitter between the TrueTime 1PPS and Motorola
1PPS pulses (see also ltchist_KEK_TTvsMOT.gif)

SK_gpsblock.gif
 Block diagram of SK GPS system hardware

SK_gpstracks.gif
 Sky map of satellites observed at SK, showing blank area due to
surrounding mountains

SK_ltcfreq_abs_drift.gif
 Time series showing current second's frequency (difference from 50 MHz)
vs time

SK_ltcfreq_rel_drift.gif
 Time series showing relative drift of the LTC oscillator frequency
between 20-minute samples over 7-day period

SK_ltcfreq_rel_drift_hist.gif
 Histogram of preceding time series

gpstrg_timing.gif
 Timing diagram for GPS system

ltchist_KEK_TTvsMOT.gif
 Histogram of [TrueTime clock's 1PPS timestamp - Motorola clock's 1PPS
timestamp] for KEK system (histogram of data shown in scope trace, 
PPS_jitter.gif)