By Topic

Development of an Embedded CPU-Based Instrument Control Unit for the SIR-2 Instrument Onboard the Chandrayaan-1 Mission to the Moon

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

12 Author(s)
Torheim, O. ; Dept. of Phys. & Technol., Univ. of Bergen, Bergen, Norway ; Bronstad, K. ; Heerlein, K. ; Mall, U.
more authors

This paper presents a computer architecture developed for the instrument control unit (ICU) of the Spectrometer Infrared 2 (SIR-2) instrument onboard the Chandrayaan-1 mission to the Moon. Characteristic features of this architecture are its high autonomy, its high reliability, and its high performance, which are obtained by the following methods: 1) adopting state-of-the-art digital-construction techniques using one single radiation-tolerant field-programmable gate array for implementing an embedded system with a 32-bit central processing unit, commercial intellectual-property cores, and custom-specified logic; 2) implementing two independent communication buses, one for instrument commanding and instrument health monitoring and another one for transferring scientific and housekeeping data to the spacecraft; 3) implementing simple and well-arranged hardware, firmware, and software; and 4) implementing in-flight software-reconfiguration capabilities available from ground command. The SIR-2 ICU performs data acquisition, data processing, and temperature regulation. Per-spectrum averaging and per-pixel oversampling are supported to reduce measurement noise. A temperature regulator for the instrument sensor unit is also implemented, with the purpose of reducing dark current noise from the detector. The embedded real-time software is implemented as a multirate cyclic executive with interrupts. Five different tasks are maintained, running with a 10-ms base cycle time. A safe mode is implemented in the boot-loader, allowing in-flight software patching through the MIL-STD-1553B bus. The advanced features of this architecture make it an excellent choice for the control unit of the scientific SIR-2 instrument, compared with architectures from previous heritage.

Published in:

Geoscience and Remote Sensing, IEEE Transactions on  (Volume:47 ,  Issue: 8 )