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| Existing ISRO Telemetry Tracking and Command (ISTRAC) Network |
| Indian
lower earth orbit satellites are controlled by the ISRO Telemetry Tracking
and Command (ISTRAC) Network stations at Bangalore, Lucknow and Mauritius.
Depending on the mission requirements network stations at Biak (Indonesia)
and Bearslake (Russia) also support the missions. The antennae at the
existing ISTRAC network stations (Bangalore, Lucknow, Mauritius, Biak and
Bearslake) will support the Chandrayaan-1 mission during GEO Transfer orbit
and Earth Transfer orbit (1,00,000 km). All these antennae are configured
for two-carrier reception both in RCP & LCP simultaneously and uplink, in
either RCP or LCP in S-Band. The stations are being equipped for remote
control from the Network Control Center (NCC). These stations are linked to
SCC by dedicated communication links.
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| Deep Space Network |
| The Deep Space Network will consist of fully steerable 18m and a 32m antenna
that will be established at Byalalu, close to Bangalore. The Network is being
augmented with a station in Bearslake, Russia and APL/JPL, USA, to improve
the visibility duration. The existing ISTRAC S-Band Network stations will be
used to support the mission during Launch and Early Orbit Phase (LEOP) that
includes Earth Transfer Orbit (ETO) with an apogee of about 1,00,000 km. The
DSN established would be state of art system with its base band system
adhering to CCSDS (Consultative Committee for Space Data Systems) Standards
thus facilitating cross-support among the Telemetry Tracking Command (TTC)
agencies.
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| 18m & 32m Antennas |
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| These two antennas will be collocated at the outskirts of Bangalore with
built in support facilities. The wheel and track 32-m antenna will be a
state-of-art system. A fibre optic link will provide necessary communication
link between the DSN Station and SCC / NCC/ ISSDC. The 18m antenna is
capable of S-Band uplink (2 kW) and both X- Band & S-Band downlink. The
system has provision to receive two downlink carriers in S-Band and two
carriers in X-Band (RCP & LCP), whereas, the uplink is either RCP or LCP. It
will also have a G/T of 30/39.5 dB/k (45 deg elevation, clear sky) for
S/X-Band. The 32m antenna is designed to provide uplink in both S-Band and
X-Band (20 kW) either through RCP or LCP. The reception capability will be
in both S-Band and X-Band (simultaneous RCP & LCP). It can receive two
carriers in S-Band and two carriers in X-Band. The system will have a G/T of
37.5/51 dB/k (450 elevation, clear sky) for S/X-Band. The base-band system
will adhere to CCSDS Standards. The station is also equipped to control
remotely from the ISTRAC Network Control Centre (NCC).
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