Astro g ground tracking station plan y murata jaxa
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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
ASTRO-GGround Tracking Station PlanY.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

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


Difference from halca tracking station
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



Tracking time (%)

Number of Tracking stations


Fakesat for vsop 2 d w murphy linux cygwin kaj wiik r dodson
FAKESAT for VSOP-2D.W.MurphyLinux/Cygwin○Kaj Wiik,R.Dodson


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


Visibility of ASTRO-G from tracking stations (ah=25,000km) i=31)

SANT

MALI

HART

USUD

TIDB

MADR

GOLD

GBANK

ω= 90

ω= 270

ω= 0

ω= 180


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


Tracking station coverage requirements
Tracking station coverage requirements i=28)

  • 3-4 tracking stations

  • Uniform Longitude coverage

  • Low Latitude is better


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