Status of Delta-DOR-related activities in JAXA
Hiroshi Takeuchi(ISAS/JAXA)
1 Recent activities in JAXA • Five Delta-DOR sessions between JAXA and JPL for MAVEN were performed. The use of service request was demonstrated in the sessions. • Development of the weather TDM file generating system was finished and used for the MAVEN sessions. • Development of the 10GbE realtime output function of RDEF data was finished but not operationally tested yet. This function will be partially tested in the Hayabusa-2 passes. • Investigation of RF direct sampling receiver started.
2 Future cross-support activities
• PROCYON will be launched on 30th November 2014 together with Hayabusa-2. Joint Delta-DOR sessions with JPL and ESA are planned on December 2014. Regular PROCYON DDOR sessions between JPL and JAXA are planned after that. • Both Hayabusa-2 and PROCYON are expected in the same beam before February 2015. • PROCYON DDOR demonstrates 86 MHz of spanning bandwidth, which is the widest bandwidth ever used. • Delta-DOR cross-support for JPL InSight mission is now under negotiation.
3 Sweeping DOR tones for PROCYON
Three independent tones are generated separately without phase modulation. Three tones are slowly sweeped within the frequency band of Bs coincidently.
Tone-1 Ch7 Tone-2 Ch35 Tone-3(outside Category B) = 8405.498MHz + = 8443.518MHz + = 8491.493MHz +
𝑓𝑓1 𝑡𝑡 𝑓𝑓𝑇𝑇 𝑡𝑡 𝑓𝑓2 𝑡𝑡 𝑓𝑓𝑇𝑇 𝑡𝑡 𝑓𝑓3 𝑡𝑡 𝑓𝑓𝑇𝑇 𝑡𝑡
38.02MHz 47.97MHz
[Hz] Bs = 4 or 8 MHz Bs = 4 or 8 MHz 𝑓𝑓𝑇𝑇 + 2 𝐵𝐵𝑠𝑠 Period = 0, 5, 10, 12,15,20, 30 or 40 minutes
0 Bs = 3.5, 3.6, 3.7, time 1.8, 1.9 MHz 7.5, 7.6, 7.7, 7.8 MHz 4 2𝑠𝑠 When Period = 0 min 𝐵𝐵 ・・・ − Bs means fixed freq = -3.9, -3.8, -3.7, , -0.1, 0, 0.1, … 3.7,3.8, 3.9 MHz DOR tone frequencies of Hayabusa2
Carrier Ch22 X: 8425.864198 MHz (= Fc) Ka: 32018.283951MHz (= Fc·3344/880)
2nd tone 2nd tone
19.15MHz 19.15MHz
1st tone 1st tone
4.79MHz 4.79MHz
• DOR tone frequencies: 4.79MHz(=Fc/1760), 19.15MHz(=Fc/440) Both X- and Ka-band have same DOR tone frequencies. • DOR tone modulation index : 0.3 rad (4.79 MHz), 0.55 rad (19.15 MHz) • DOR tone waveform: Sine Wave
Frequency of the lower 2nd tone of Hayabusa2 is close to that of 1st tone of PROCYON. Frequency of the upper 2nd tone of Hayabusa2 is close to that of the 2nd tone of the PROCYON. 9 HYB2 – PROCYON DDOR passes in total JAXA: 4 passes ESA: 3 passes
# YY DOY BOT EOT stations 1 14 361 0645 0845 DSS-24 DSS-35 E-W 2 14 361 1205 1405 DSS-35, USUDA N-S 14 361 1307 1405 NNO 3 14 363 0620 0820 DSS-15 DSS-34 E-W 4 14 363 1325 1525 NNO DSS-34 USUDA N-S 5 14 364 0620 0820 DSS-24 DSS-45 E-W 6 14 364 1200 1400 DSS-45 USUDA N-S 14 364 1318 1400 NNO 7 14 365 0700 0900 DSS-24 DSS-45 E-W 8 15 004 0655 0855 DSS-15 DSS-45 E-W 9 15 004 1300 1500 DSS-34 USUDA N-S
PROCYON: mode1: sweeping tone mode (sweeping bandwidth +/-4MHz) mode2: fixed tone mode mode3: tone off mode
1st 30 minutes -> mode1 Next 45 minutes -> mode2 Last 45 minutes -> mode3
OEM 1. Hayabusa2 trajectory 2. PROCYON trajectory 6 3. HYB2 and PRCN averaged trajectory (JAXA will decide whether 2 or 3 will be delivered.)