Indeed this is very interesting to know the internals of a spacecraft! Here we go:
The spacecraft configuration is a balanced mix of design from flight proven IRS/INSAT/Chandrayaan-1 bus. Modifications required for Mars mission are
in the areas of Communication, Power, Propulsion systems (mainly related to Liquid Engine restart after nearly 10 months) and on-board autonomy.
- 390 litres capacity propellant tanks accomodate a maximum of 852 kg of propellant which is adequate with sufficient margins.
- A Liquid Engine of 440 N thrust is used for orbit raising and insertion in Martian Orbit.
- The spacecraft requires three solar panels (size 1800 X 1400 mm) to compensate for the lower solar irradiance.
- Antenna System consists of Low Gain Antenna (LGA), Medium Gain Antenna (MGA), and High Gain Antenna (HGA). The High Gain Antenna system is based on a single 2.2 meter reflector illuminated by a feed at S-band. It is used to transmit/receive the Telemetry, Tracking and Commanding (TTC) and data to/from the Indian Deep Space Network
- On-board autonomy functions are incorporated as the large distance does not permit real time interventions.
| Lift-off Mass | 1337 kg |
| Structures | Aluminum and Composite Fiber Reinforced Plastic (CFRP) sandwich construction- modified I-1 K Bus |
| Mechanism | Solar Panel Drive Mechanism (SPDM), Reflector & Solar panel deployment |
| Propulsion | Bi propellant system (MMH + N2O4) with additional safety and redundancy features for MOI. Proplellant mass:852 kg |
| Thermal System | Passive thermal control system |
| Power System | Single Solar Array-1.8m X 1.4 m – 3 panels – 840 W Generation (in Martian orbit), Battery:36AH Li-ion |
| Attitude and Orbit Control System | AOCE (Attitude and Orbit Control Electronics): with MAR31750 ProcessorSensors: Star sensor (2Nos), Solar Panel Sun Sensor (1No), Coarse Analogue Sun SensorActuators: Reaction Wheels (4Nos), Thrusters (8Nos), 440N Liquid Engine |
| Antennae | Low Gain Antenna (LGA), Mid Gain Antenna (MGA) and High Gain Antenna (HGA) |
| Launch Date | Nov 05, 2013 |
| Launch Site | SDSC SHAR Centre, Sriharikota, India |
| Launch Vehicle | PSLV – C25 |