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Shishir

PROFILE

Shishir

During a three-month period, Sam Bhattarai developed and refined flight dynamics and simulation software for the ISSUIUC/MIDAS-Software and TARS-Controls repositories. He implemented an Extended Kalman Filter-based state estimation pipeline for rocket flight, integrating barometric and accelerometer data, aerodynamic models, and motor thrust profiles using C++ and advanced data structures. Sam corrected coordinate transformation logic to ensure accurate body-to-global reference mapping, improving downstream physics and rendering. He also prepared aerodynamic simulation data by adding motor lookup tables in CSV format, enabling robust validation of motor performance. His work demonstrated depth in aerodynamics, sensor fusion, and embedded systems engineering.

Overall Statistics

Feature vs Bugs

75%Features

Repository Contributions

15Total
Bugs
1
Commits
15
Features
3
Lines of code
3,383
Activity Months3

Work History

March 2025

2 Commits • 2 Features

Mar 1, 2025

February? Wait the month is 2025-03. Provide a concise monthly summary focusing on business value and technical achievements across two repositories. Highlights include feature delivery updates to EKF-based flight dynamics and aerodynamic simulation readiness through new motor lookup data.

February 2025

12 Commits • 1 Features

Feb 1, 2025

February 2025 (2025-02) - ISSUIUC/MIDAS-Software: Delivered a robust EKF-based rocket flight state estimation pipeline with enhanced initialization, state prediction and update logic, and integration of flight phases, aerodynamic data, and motor thrust models. Completed data-loading refinements, code refactors, and documentation to improve estimation accuracy, maintainability, and onboarding. Fixed build stability by resolving compilation issues and implementing the get thrust capability. Implemented a data-lookup optimization (array of structs) based on peer feedback to improve performance and clarity. Expanded documentation and code comments to support future maintenance and knowledge transfer.

December 2024

1 Commits

Dec 1, 2024

Month: 2024-12 — Concise monthly summary for ISSUIUC/MIDAS-Software. Delivered a critical bug fix in the Body2Global coordinate transformation to correct the multiplication order and include the roll matrix, thereby ensuring accurate transformation from body coordinates to global coordinates. This correction stabilizes downstream usage in rendering and physics pipelines and prevents incorrect world positioning due to rotation handling.

Activity

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Quality Metrics

Correctness80.8%
Maintainability82.6%
Architecture80.0%
Performance74.0%
AI Usage20.0%

Skills & Technologies

Programming Languages

C++CSV

Technical Skills

AerodynamicsAerodynamics SimulationAerospace EngineeringAerospace SoftwareBuild SystemsC++Coordinate TransformationsData ManagementData StructuresDebuggingEmbedded SystemsKalman FiltersLinear AlgebraRoboticsRocketry

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

ISSUIUC/MIDAS-Software

Dec 2024 Mar 2025
3 Months active

Languages Used

C++CSV

Technical Skills

Coordinate TransformationsLinear AlgebraRoboticsAerodynamicsAerospace EngineeringAerospace Software

ISSUIUC/TARS-Controls

Mar 2025 Mar 2025
1 Month active

Languages Used

CSV

Technical Skills

Aerodynamics SimulationData Management

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