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|