Indian Deep Space Network (IDSN)


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Sep 22, 2012
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The Indian Deep Space Network consists of a 18-m and a 32-m antennae that are established at the IDSN campus, Byalalu, Bangalore. The Network is augmented with a couple of stations in the western hemisphere in addition to the 64-m antenna in Bearslake, Russia to improve the visibility duration and to provide support from the antipodal point.

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) up to a range of about 1,00,000 km. Although the 18-m antenna is tailored for Chandrayaan-1 mission, the 32-m antenna can also support other planetary missions. The established IDSN is a state-of-the-art system, with its base band system adhering to CCSDS (Consultative Committee for Space Data Systems) Standards, thus facilitating cross-support among other TTC agencies. The supporting network stations will ensure the adequacy of the link margin for telemetry/dwell, tracking, tele command and payload data reception. The IDSN station has the responsibility of receiving the spacecraft health data as well as the payload data in real time. Later, conditioning of the data takes place, before onward transmission of the same to Mission Operations Complex at Bangalore. The tracking data comprising Range, Doppler and Angle data will be transferred to the control center for the purpose of orbit determination. The payload data will be transmitted to the Indian Space Science Data Center (ISSDC) as and when received by the payload data acquisition system, located at the station.

18-m Antenna

The 18-m dish antenna is configured for Chandryaan-1 mission operations and payload data collection. The antenna is established at the IDSN Campus, Byalalu, situated at the outskirts of Bangalore with built in support facilities. A fibre optic / satellite link will provide the necessary communication link between the IDSN Station and Mission Operations Complex (MOX) / Indian Space Science Data Centre (ISSDC). This antenna is capable of S-Band uplink (2 kW) and both X-Band and S-Band downlink. This system has provision to receive two downlink carriers in S-Band and one carrier in X-Band (RCP and LCP) simultaneously, whereas, the uplink is either RCP or LCP. The system will have a G/T of 30/39.5 dB/K (45º elevation, clear sky) for S/X-Band. The base-band system will adhere to the CCSDS Standards. The station can be remotely operated from ISTRAC Network Control Centre (NCC). The figure depicts the 18-m antenna.

32-m Antenna

The wheel and track 32-m antenna is a state-of-the-art system that will support the Chandrayaan-1 mission operations and beyond. This is co-located with 18-m antenna in the IDSN site at Byalalu. A fibre optics / satellite link will provide the necessary connectivity between the IDSN site and Spacecraft Control Centre / Network Control Centre. This antenna is designed to provide uplink in both S-Band (20/2 kW) and X-Band (2.5 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 one carrier in X-Band, simultaneously. The system will have a G/T of 37.5/51 dB/K (45° elevation, clear sky) for S/X-Band. The base-band will adhere to CCSDS Standards facilitating cross-support among the space agencies. The station is also equipped for remote control from the ISTRAC Network Control Centre (NCC).

Existing S-Band ISTRAC Network

Indian lower earth orbit satellites are controlled by the ISRO Telemetry Tracking and Command (ISTRAC) Network stations. The Elevation over Azimuth 10/11/12-m dish antennae at the existing ISTRAC network stations (Bangalore, Lucknow, Mauritius, Bearslake, Biak, Brunei, Trivandrum and Port Blair) will be augmented to serve the Chandrayaan-1 mission during Earth Transfer Orbits and Lunar Transfer Trajectory up to a range of about 1,00,000 km. All these antennae are configured for two-carrier reception (RCP&LCP) and uplink, in either RCP or LCP in S-Band. The G/T of the stations is 21/23 dB/K. The base-band will adhere to CCSDS Standards, facilitating cross-support among the TTC agencies. The stations are being equipped for remote control from the ISTRAC Network Control Centre (INCC). These stations are linked to MOX by dedicated communication links.

External Network Stations

External network stations APL, JPL (Goldstone, Canberra, Madrid), Hawaii, Brazil (Alcantara, Cuiaba) are requisitioned in for the purpose of extended visibility of Launch and Early Orbit Phase (LEOP) operations, as well as to gain the near continuous visibility during the normal phase operations. All the external stations will ensure the required compatibility to communicate with the spacecraft.

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