The document describes several projects completed at ISRO Satellite Centre related to satellite systems. It provides details of 8 projects including the project name, location, client, operating system, tools used, programming languages, descriptions, and responsibilities. The projects involved migrating software, developing telemetry interface and simulation software, onboard software for attitude and orbit control, optimizing magnetic torquer design, star pattern simulation, and resource accounting software.

1. Details of Previous Projects (at ISRO SATELLITE CENTER)
Project Name Migration of HILS software from DEC Alpha to Intel
Work Location ISRO Satellite Centre, Bangalore
Client Internal to ISRO
Operating System Digital Unix, Linux
Tools RUP
Language X-Motif, C, C++, Socket programming, IPC
Project Description HILS software was coded with FORTRAN and C language on Digital Unix
platform. As per the requirements, migrating and making the AOCE testing
software from DEC Alpha workstations compatible to Linux 32-bit Intel
system, and for the uniformity of the HILS software.
Responsibilities • Code walk through of the existing HILS software.
• Designed the software with the help of Rational Rose Development Suite
and created Use-case diagrams, Activity diagrams, Class diagrams.
• Comparing Digital Unix system level standards with Linux standards.
• Coding of modules like dynamics equations solving, thruster module, FEP
data processing, Magnetic torque processing, wheel processing, LAM
mode etc., in C language 5. Open-loop & Closed loop testing
Project Name Telemetry Interface Software
Work Location ISRO Satellite Centre, Bangalore
Client Internal to ISRO
Operating System Digital Unix
Tools
Language X-Motif, C, Socket programming, shell scripting, IPC
Project Description Telemetry processing is to measure the Space Craft's characteristics. The
software acquires Telemetry data from Front End processor, finds the frame-
sync, processes the data according to the parameters' database, and archives
the data for post-processing.
Responsibilities Involved in the requirements gathering, analysis, preparation of test-cases &
results, leading the team for completion of the requirement, delivery &
maintenance. Project: IRS-P5, Cartosat -2 & SRE
• Telemetry data acquisition from FEP (Front End Processor) for both 1kbps
& 4kbps data speed.
• Identification of Frame Sync for normal, dwell and playback data.
• Creation of master database for Telemetry parameters.
• Real-time TM Data Processing.
• Real-time Page display and plotting for normal, dwell and playback
Telemetry data.
• Real-time Plotting provision for normal, dwell and playback TM data.
• Archiving of the raw data.
• Post processing for the archived data for normal and 4#formats of playback
data.
Project Name AOCE Simulation Software (Attitude & Orbit Control Electronics)
Work Location ISRO Satellite Centre, Bangalore
Client Internal to ISRO
Operating System Digital Unix
Tools Rational Rose

2. Language X-Motif, C, Socket programming, shell scripting, IPC
Project Description This software is developed to validate AOCE system (Attitude and Orbit
Control Electronics), which receives torque signals from actuators, then solves
spacecraft dynamic equations, and gives the calculated error rates to drive the
servo table.
Responsibilities Responsible for code changes & testing of Data Acquisition from AOCE,
Actuator Processings, Dynamics equations solving, Sensor Simulations, GUI
developed for initial conditions, to control the simulation, for storage &
communication.
Project Name AOCE On-Board Software
Work Location ISRO Satellite Centre, Bangalore
Client Internal to ISRO
Operating System Sun Solaris, Digital Unix
Tools Rational Rose
Language C++
Project Description This software continuously monitors the change in the position of spacecraft.
AOCE computes the errors with respect to sensors mounted on spacecraft and
sends back the error rates to the actuators.
Responsibilities Worked as the Team member for analyzing the requirements, designing,
coding and conducting unit level
Project Name Magnetic Torquer's Optimized Design
Work Location ISRO Satellite Centre, Bangalore
Client Internal to ISRO
Operating System Linux
Tools
Language C
Project Description Magnetic Torquer is an actuator to control the satellite, which works on the
principle of earth's magnetic attraction. This produces the magnetic force
depending upon factors like, dimensions of core and coil, number of rotations
of coil and the number of layers around the core. These factors have to be
optimized to produce the required magnetic force. Here Genetic algorithms
Technique, one of the optimizing search techniques based on principles of
natural selection is used in order to optimize the design of the magnetic
Torquer.
Responsibilities Requirement capturing, designing, coding and testing of the software
Project Name Dynamic Multi Star Simulator (DMSS)
Work Location ISRO Satellite Centre, Bangalore
Client Internal to ISRO
Operating System Digital Unix
Tools
Language C, Socket programming, IPC
Project Description DMSS simulates the star pattern along with star coordinates, intensity of the
pattern, and back-light of the screen at a given instant of time. The position of
the spacecraft on-board can be identified with the help of star pattern
produced by the DMSS.
Responsibilities Worked in requirement capturing, designing, coding and testing. Modules
involved are Star catalog, Star identification algorithm and Intensity

3. verification software.
Project Name System Resource Accounting Software
Work Location ISRO Satellite Centre, Bangalore
Client Internal to ISRO
Operating System Digital Unix
Tools
Language shell scripting, Unix System Administration
Project Description This Software developed for Digital Unix NIS Server, which helps the System
Administrator to monitor the system resources statistics of all the hosts
connected in the local network, tracked on a daily, monthly, and as well as
yearly basis with respect to prime and non-prime time usage.
Responsibilities Responsible for collecting the requirements from users and analyzing with the
different Unix flavors features, coding, testing with different reports.