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ASTRO-G Ground Tracking Station Plan Y.Murata (JAXA)

ASTRO-G Ground Tracking Station Plan Y.Murata (JAXA). Start from HALCA design Functions Uplink reference signal Data demodulation Data recording Telemetry Data Extraction Doppler measurement. Signal from Astronomical Objects. VSOP tracking station. LNA. ANT.

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ASTRO-G Ground Tracking Station Plan Y.Murata (JAXA)

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  1. ASTRO-GGround Tracking Station PlanY.Murata (JAXA) • Start from HALCA design • Functions • Uplink reference signal • Data demodulation • Data recording • Telemetry Data Extraction • Doppler measurement

  2. Signal from Astronomical Objects VSOP tracking station LNA ANT 1 Frame (10,000 byte / 5 ms) D/C A/D VLBI data TX MOD TLM Header (8byte) SYNC (4byte) HGA １４．２GHｚ QPSK LOCAL TLM RX ground VLBIdata １５．３GHｚ＋ Doppler Correction CW DEMOD 32M clock 2way Doppler 1PPS gen. 1 PPS Downlink Freq. Cntl. VLBI Recording Uplink Freq. Cntl. 2way phase residual Orbit Prediction H maser

  3. Difference from HALCA tracking station • Frequencies • Up: 40 GHz + Doppler Compensation(?) • Down: 37 – 38 GHz • Data demodulation • 1 Gbps QPSK • Data recording • Giga-bit recording, VSI (VERA, Mark 5, K5/VSI, …) • Telemetry Data Extraction • Realtime / near realtime • Doppler measurement • No Phase cal pulse

  4. Number of Tracking stations

  5. Tracking time (%) Number of Tracking stations

  6. FAKESAT for VSOP-2D.W.MurphyLinux/Cygwin○Kaj Wiik,R.Dodson

  7. Visibility of HALCA from tracking stations (ah=21,000km, i=31) South Apogee North Apogee SANT MALI HART USUD TIDB MADR GOLD GBANK ω= 270 ω= 90 ω= 0 ω= 180

  8. Visibility of ASTRO-G from tracking stations (ah=25,000km) SANT MALI HART USUD TIDB MADR GOLD GBANK ω= 90 ω= 270 ω= 0 ω= 180

  9. Visibility of ASTRO-G from tracking stations (ah=36,000km, i=28) SANT MALI HART USUD TIDB MADR GOLD GBANK ω= 270 ω= 90 ω= 0 ω= 180

  10. Tracking station coverage requirements • 3-4 tracking stations • Uniform Longitude coverage • Low Latitude is better

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