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1. Analysis of Possible use of Non-Ramped Uplinks, using example of Cassini Rhea Encounter David Tyner NOPE 11 Jan 2006

5. XFR at T 0 = 2245z TSF 34 = 7174.510 MHz TSF 63 = 7174.660 MHz TR MAX = (150 Hz/s) * (3600 s/hr) = 540 kHz/hr “ BLF” = 7174.559 MHz Nominal Non-Ramped Uplink Transfer at Closest Approach TSF – XA Difference = 49 kHz TSF – XA Difference = 106 kHz Uplink Transfer DSS-34 to DSS-63

6. TR MAX = (150 Hz/s) * (3600 s/hr) = 540 kHz/hr “ Improved” Non-Ramped Uplink Transfer at Closest Approach TSF 34 = 7174.535 MHz TSF 63 = 7174.611 MHz XFR at T 0 = 2245z “ BLF” = 7174.559 MHz By Shortening PDX Duration, We Reduce the XA MAX - XA MIN Difference, which brings TSFs closer to Doppler Curve TSF – XA Difference = 25 kHz TSF – XA Difference = 53 kHz Uplink Transfer DSS-34 to DSS-63

8. XFR at T 0 = 2245z TSF 34 = 7174.535 MHz TR MAX = (150 Hz/s) * (3600 s/hr) = 540 kHz/hr XFR at T 0 = 0550z TSF 63 = 7174.611 MHz “ BLF” = 7174.686 MHz 75 kHz 95 kHz TSF 14 = 7174.781 MHz

9. TSF 34 = 7174.535 MHz TR MAX = (150 Hz/s) * (3600 s/hr) = 540 kHz/hr 2 nd GDSCC PDX loaded to Restrict < 50 kHz “ BLF” = 7174.691 MHz 50 kHz 50 kHz TSF 14 = 7174.781 MHz “ BLF” = 7174.611 MHz TSF 14 = 7174.661 MHz LOSS OF UPINK, to LOAD PDX TSF 14 = 7174.611 MHz 1 st ORIGINAL 2 nd new PDX view period

10. Windowed Non-Ramped Uplinks T 0 331 / 0230 0430 0630 0830 1030 1230 1430 1630 T 0 + OWLT = T OWLT +2 +4 +6 +8 +10 +12 +14 DOWNLINK RNG OK U/L PDX Load Glitch, Loss of data in D/L “Pipeline” NEW RNG cycle U/L PDX Load Glitch, Loss of data in D/L “Pipeline” NEW RNG cycle UPLINK No RNG No RNG