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Karidhal, Ritu
- Mission Automation and Autonomy for the Mars Orbiter Mission
Abstract Views :241 |
PDF Views:93
Authors
Affiliations
1 Mission Development Group, Indian Space Research Organisation Satellite Centre, Bengaluru 560 017, IN
1 Mission Development Group, Indian Space Research Organisation Satellite Centre, Bengaluru 560 017, IN
Source
Current Science, Vol 109, No 6 (2015), Pagination: 1070-1075Abstract
For interplanetary missions such as the Mars Orbiter Mission (MOM), operating at considerable distances from the Earth, the paradigms of autonomy and automation are especially pertinent. For mission autonomy, the reasons are identified to extend the existing features and adding new mechanisms on-board the spacecraft, which were not available in earlier satellites. For mission automation, space segment and ground segment elements such as mission planning system and automation in the control room are reviewed and necessary elements added.For interplanetary missions where distances and times for to and fro travel are more, S/C has to micro manage itself. Therefore it would be essential to use on-board to use on-board autonomy to recognize problems on-board the spacecraft and fix them automatically. Thus, autonomous fault detection becomes vital for such long-term, long-distance missions. Various FDIR (Fault Detection, Isolation and Reconfigure) logics were proposed to be added to take care of several autonomy actions. Safe mode recovery and reconfiguration is one of the most critical autonomy features as the ground intervention is not possible till the on-board antenna is automatically oriented towards Earth by the spacecraft.
Similarly, mission automation concepts have been added for various operations with known timelines such as performing Mars Orbiter Insertion operation through an on-board sequencer and various payload operations within an orbit using CCB and Macros features of the on-board TCP processor. One of the most important aspects of mission automation is mission planning, i.e. to work out a proper timeline for all onboard and ground operations using an Executive Scheduler on ground and make the spacecraft ready to take actions based on set timelines.
Keywords
Ground Station, Mars Orbiter, Mission Automation and Autonomy, Payload Operations.Full Text
- Unambiguous detection of OH and H2O on the Moon from Chandrayaan-2 Imaging Infrared Spectrometer reflectance data using 3 μm hydration feature
Abstract Views :229 |
PDF Views:89
Authors
Prakash Chauhan
1,
Mamta Chauhan
1,
Prabhakar A. Verma
1,
Supriya Sharma
1,
Satadru Bhattacharya
2,
Aditya Kumar Dagar
3,
Amitabh
3,
Abhishek N. Patil
3,
Ajay Kumar Parashar
3,
Ankush Kumar
3,
Nilesh Desai
3,
Ritu Karidhal
4,
A. S. Kiran Kumar
5
Affiliations
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, IN
3 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, IN
4 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, IN
5 Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, IN
1 Indian Institute of Remote Sensing, Indian Space Research Organization, Dehradun 248 001, IN
2 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, IN
3 Space Applications Centre, Indian Space Research Organisation (ISRO), Ahmedabad 380 015, India, IN
4 U.R. Rao Satellite Centre, ISRO, Bengaluru 560 017, India, IN
5 Indian Space Research Organisation Head Quarters, Bengaluru 560 094, India, IN
Source
Current Science, Vol 121, No 3 (2021), Pagination: 391-401Abstract
Imaging Infrared Spectrometer (IIRS) on-board Chandrayaan-2 is designed to measure lunar reflected and emitted solar radiation in 0.8–5.0 μmm spectral range. Its high spatial resolution (~80 m) and extended spectral range is most suitable to completely characterize lunar hydration (2.8–3.5 μmm region) attributed to the presence of OH and/or H2O. Here we present initial results from IIRS reflectance data analysed to unambiguously detect and quantify lunar 3 μmm absorption feature. After pre-processing and data-reduction, a physics based thermal correction analysis of IIRS reflectance spectra has been done using co-located temperature measurements. Hydration absorption was observed at all latitudes and surface types with varying degrees for all pixels in the study area and its absorption depth shows distinct variability associated with mineralogy, surface temperature and latitude.Keywords
Imaging Infrared Spectrometer, Lunar Hydration, Moon, Reflectance Data, Thermal Correction.Full Text
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