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Terrain Mapping Camera (TMC)
Scientific Objective:
The aim of TMC is to map topography of both near and far side of the Moon and prepare a 3-dimensional atlas with high spatial and elevation resolution of 5 m. Such high resolution mapping of complete lunar surface will help to understand the evolution processes and allow detailed study of regions of scientific interests. The digital elevation model available from TMC would improve upon the existing knowledge of Lunar Topography.
Payload Configuration Details:
The TMC will image in the panchromatic spectral region of 0.5 to 0.85 m, with a spatial/ ground resolution of 5 m and swath coverage of 20 km. The camera is configured for imaging in the pushbroom mode, with three linear 4k element detectors in the image plane for fore, nadir and aft views, along the ground track of the satellite. The fore and aft view angles are 25 respectively w.r.t. Nadir. TMC will measure the solar radiation reflected / scattered from the Moons surface. The dynamic range of the reflected signal is quite large, represented by the two extreme targets fresh crust rocks and mature mare soil.
TMC uses Linear Active Pixel Sensor (APS) detector with in-built digitizer. Single refractive optics will cover the total field of view for the three detectors. The output of the detector will be in digitized form. The optics is designed as a single unit catering to the wide field of view (FOV) requirement in the direction along the ground track. The incident beams from the fore (+25) and aft (-25) directions are directed on to the focusing optics, using mirrors. Modular camera electronics for each detector is custom designed for the system requirements using FPGA. The expected data rate is of the order of 50 Mbps. The dimension of TMC payload is 370 mm x 220 mm x 414 mm and mass is 6.3 kg.
TMC payload is developed by ISRO
 
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Indian Space Research Organisation
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Last Update
11 Nov 2008