Space-and-Satellite-Systems-UC-Davis/ADCS-Software
Jan 2025 – Jun 2026
9 Months active
Languages Used
CMakefileMarkdownYAML
Technical Skills
C ProgrammingControl SystemsEmbedded SystemsAerospace EngineeringC programmingalgorithm design
Li, Chun Ho
PROFILE
Li, Chun Ho
Worked on the Space-and-Satellite-Systems-UC-Davis/ADCS-Software repository, delivering core features and reliability improvements for satellite attitude control. Over nine months, contributed to detumbling algorithm enhancements, sensor calibration pipelines, and experimental frameworks, focusing on robust, testable embedded C code. Refactored control logic to reduce external dependencies, centralized logging interfaces, and expanded unit testing for mathematical modules. Improved build automation and cross-platform CI/CD using Makefile, GCC, and GitHub Actions, enabling smoother integration and faster validation cycles. Addressed bugs in sensor data handling and experiment timing, while maintaining open source compliance and documentation. Prioritized maintainability, data integrity, and operational safety throughout development.
Overall Statistics
Feature vs Bugs
80%Features
Repository Contributions
45Total
Bugs
4
Commits
45
Features
16
Lines of code
3,384
Activity Months9
Your Network
59 peopleSame Organization
@ucdavis.edu52
Work History
June 2026
10 Commits • 2 Features
Jun 1, 2026Month: 2026-06 Key features delivered: - Build system and CI improvements for Space-and-Satellite-Systems-UC-Davis/ADCS-Software: automatic discovery of C sources in sources.mk, CI workflow updates to retrieve GCC version and surface a string-overflow warning, and macOS GCC-15 local.mk support with host-specific overrides. Representative commits include 34122440788aed30320fa4e72a5ed88ea77f47df; 72b338c08095c46be54c26bfeb4b903c00710a18; b39296c2cb46b7e5832de8b39ef9e88179b33ad9; ccb02e80c4f84f859c8bbdb6ac1e62a0d128a912; f91339bfbc2e6861e5d8a5e1924d3f81cb740169; 15c7edfe11beffd2be0ce91f3961a42c28c43e09. - ADCS experimental enhancements and testing framework: refactors to improve detumbling and PID experiment modes and expanded the testing framework for experiments. Representative commit: 00f9594e8506083f9ae816088cbe463426140db8. - PID experiment logic fixes and timing/matrix cleanup: fixes to PID experiment logic after rebase, removes redundant header include, resolves timing issues in the determination experiment loop, and removes duplicate transformation matrices for IMU references. Representative commits: cb08c1bf8fb6b947429477d766679e93198c2695; 447b21c6664a652c443ff771f8e9c92399a2bdfa; 9f638fa4d237ebd8b51bbe4be0700c5ffb48d970. Major bugs fixed: - PID experiment logic issues uncovered by rebase were corrected, including removing a duplicate function and stabilizing timing within the experiment loop. This reduced nondeterministic behavior during experiments. Representative commits: cb08c1bf8fb6b947429477d766679e93198c2695; 447b21c6664a652c443ff771f8e9c92399a2bdfa; 9f638fa4d237ebd8b51bbe4be0700c5ffb48d970. Overall impact and accomplishments: - Significantly improved cross-platform build reliability and developer productivity through automated source discovery and macOS GCC-15 compatibility, enabling easier local development and CI stability. Expanded ADCS experimentation capabilities with safer detumbling and PID workflows, accelerating research cycles. Fixed core timing and transformation matrix issues that reduced risk of unstable experiments during integration. These changes reduce build failures and debugging time, shortening time-to-first-good-commit and increasing throughput for feature validation. Technologies/skills demonstrated: - C build systems and cross-platform CI automation (sources.mk, local.mk, macOS overrides), cross-functional collaboration with CI pipelines; embedded control logic (detumbling, PID experiments); testing framework expansion; debugging after rebases; and proactive refactoring for maintainability and reliability.
10 Commits • 2 Features
Jun 1, 2026Month: 2026-06 Key features delivered: - Build system and CI improvements for Space-and-Satellite-Systems-UC-Davis/ADCS-Software: automatic discovery of C sources in sources.mk, CI workflow updates to retrieve GCC version and surface a string-overflow warning, and macOS GCC-15 local.mk support with host-specific overrides. Representative commits include 34122440788aed30320fa4e72a5ed88ea77f47df; 72b338c08095c46be54c26bfeb4b903c00710a18; b39296c2cb46b7e5832de8b39ef9e88179b33ad9; ccb02e80c4f84f859c8bbdb6ac1e62a0d128a912; f91339bfbc2e6861e5d8a5e1924d3f81cb740169; 15c7edfe11beffd2be0ce91f3961a42c28c43e09. - ADCS experimental enhancements and testing framework: refactors to improve detumbling and PID experiment modes and expanded the testing framework for experiments. Representative commit: 00f9594e8506083f9ae816088cbe463426140db8. - PID experiment logic fixes and timing/matrix cleanup: fixes to PID experiment logic after rebase, removes redundant header include, resolves timing issues in the determination experiment loop, and removes duplicate transformation matrices for IMU references. Representative commits: cb08c1bf8fb6b947429477d766679e93198c2695; 447b21c6664a652c443ff771f8e9c92399a2bdfa; 9f638fa4d237ebd8b51bbe4be0700c5ffb48d970. Major bugs fixed: - PID experiment logic issues uncovered by rebase were corrected, including removing a duplicate function and stabilizing timing within the experiment loop. This reduced nondeterministic behavior during experiments. Representative commits: cb08c1bf8fb6b947429477d766679e93198c2695; 447b21c6664a652c443ff771f8e9c92399a2bdfa; 9f638fa4d237ebd8b51bbe4be0700c5ffb48d970. Overall impact and accomplishments: - Significantly improved cross-platform build reliability and developer productivity through automated source discovery and macOS GCC-15 compatibility, enabling easier local development and CI stability. Expanded ADCS experimentation capabilities with safer detumbling and PID workflows, accelerating research cycles. Fixed core timing and transformation matrix issues that reduced risk of unstable experiments during integration. These changes reduce build failures and debugging time, shortening time-to-first-good-commit and increasing throughput for feature validation. Technologies/skills demonstrated: - C build systems and cross-platform CI automation (sources.mk, local.mk, macOS overrides), cross-functional collaboration with CI pipelines; embedded control logic (detumbling, PID experiments); testing framework expansion; debugging after rebases; and proactive refactoring for maintainability and reliability.
June 2026
May 2026
5 Commits • 3 Features
May 1, 2026May 2026 monthly summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software. Delivered three key enhancements to improve reliability, maintainability, and data integrity in the ADCS stack. Highlights include: (1) Centralized ADCS logging interface by relocating the logger interface header into the ADCS repository, with compatibility updates in logging_records.h to preserve data structures and ensure seamless integration across components; (2) Added ADCS Math module unit tests, including test binaries and a test harness to validate attitude determination and control computations under diverse scenarios, increasing reliability and correctness; (3) Improved data integrity and traceability by ensuring unique uplink calibration record identifiers, addressing calibration tagging issues and clarifying logging. Core commits span: d1fd45f60107b62f207b20a9d3fddb542c2069f6 and 7c035c2024da2e87b2634c57a4fecf5f17c0de46 (logger_interface.h relocation), d4477c2ada991d993323aca6fb25968fbdf21e25 (ADCS Math tests), 56e7b7b656425a879fe90c57e53e09cb97c04f57 and 27b88c32815f308175ee2938de5a2bd0060d494b (uplink calibration tag bug fixes).
May 2026
5 Commits • 3 Features
May 1, 2026May 2026 monthly summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software. Delivered three key enhancements to improve reliability, maintainability, and data integrity in the ADCS stack. Highlights include: (1) Centralized ADCS logging interface by relocating the logger interface header into the ADCS repository, with compatibility updates in logging_records.h to preserve data structures and ensure seamless integration across components; (2) Added ADCS Math module unit tests, including test binaries and a test harness to validate attitude determination and control computations under diverse scenarios, increasing reliability and correctness; (3) Improved data integrity and traceability by ensuring unique uplink calibration record identifiers, addressing calibration tagging issues and clarifying logging. Core commits span: d1fd45f60107b62f207b20a9d3fddb542c2069f6 and 7c035c2024da2e87b2634c57a4fecf5f17c0de46 (logger_interface.h relocation), d4477c2ada991d993323aca6fb25968fbdf21e25 (ADCS Math tests), 56e7b7b656425a879fe90c57e53e09cb97c04f57 and 27b88c32815f308175ee2938de5a2bd0060d494b (uplink calibration tag bug fixes).
February 2026
1 Commits
Feb 1, 2026February 2026 summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software. No new features released this month; focus remained on correctness, stability, and QA readiness. The primary deliverable was a targeted bug fix improving magnetic dipole moment computation accuracy and preventing incorrect results in simulations/analyses.
1 Commits
Feb 1, 2026February 2026 summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software. No new features released this month; focus remained on correctness, stability, and QA readiness. The primary deliverable was a targeted bug fix improving magnetic dipole moment computation accuracy and preventing incorrect results in simulations/analyses.
February 2026
January 2026
2 Commits • 1 Features
Jan 1, 2026January 2026 performance summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software focusing on detumbling reliability, code quality, and maintainability to strengthen early-orbit attitude control.
January 2026
2 Commits • 1 Features
Jan 1, 2026January 2026 performance summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software focusing on detumbling reliability, code quality, and maintainability to strengthen early-orbit attitude control.
December 2025
12 Commits • 4 Features
Dec 1, 2025In December 2025, the ADCS software team delivered a set of reliability-focused enhancements in the Space-and-Satellite-Systems-UC-Davis/ADCS-Software repository. Key work included detumbling control robustness with BDOT filtering and timing improvements, sensor calibration and data processing robustness, a new 3D vector equality utility, improved moon-direction error reporting, and licensing/notice updates for better compliance and maintainability. These changes collectively strengthen attitude stability, data-path clarity, and overall mission resilience while improving maintainability and compliance.
12 Commits • 4 Features
Dec 1, 2025In December 2025, the ADCS software team delivered a set of reliability-focused enhancements in the Space-and-Satellite-Systems-UC-Davis/ADCS-Software repository. Key work included detumbling control robustness with BDOT filtering and timing improvements, sensor calibration and data processing robustness, a new 3D vector equality utility, improved moon-direction error reporting, and licensing/notice updates for better compliance and maintainability. These changes collectively strengthen attitude stability, data-path clarity, and overall mission resilience while improving maintainability and compliance.
December 2025
November 2025
10 Commits • 2 Features
Nov 1, 2025Monthly overview for 2025-11 focused on Space-and-Satellite-Systems-UC-Davis/ADCS-Software. Delivered major ADCS enhancements and improved build reliability to accelerate validation and maintenance. Work concentrated on sensor handling and attitude determination accuracy, plus a more maintainable calibration and matrix math stack, complemented by a stabilized build/config workflow to reduce integration friction and enable safer development cycles.
November 2025
10 Commits • 2 Features
Nov 1, 2025Monthly overview for 2025-11 focused on Space-and-Satellite-Systems-UC-Davis/ADCS-Software. Delivered major ADCS enhancements and improved build reliability to accelerate validation and maintenance. Work concentrated on sensor handling and attitude determination accuracy, plus a more maintainable calibration and matrix math stack, complemented by a stabilized build/config workflow to reduce integration friction and enable safer development cycles.
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025 (2025-10) monthly summary: Delivered the ADCS Experimental Framework Enhancements that integrate determination_experiment and ramp_experiment into ADCS.C, introduced the ADCS_HDD_TESTING mode for isolated hardware validation, and refined error handling for detumble and PID experiments. This work, combined with refactoring ADCS.C to call modular functions, improves testability, reduces integration risk, and accelerates experimental cycles. The commit bceb772be200568efbcc2cc729cca5600ea269d2 documents the function-call refactor.
1 Commits • 1 Features
Oct 1, 2025October 2025 (2025-10) monthly summary: Delivered the ADCS Experimental Framework Enhancements that integrate determination_experiment and ramp_experiment into ADCS.C, introduced the ADCS_HDD_TESTING mode for isolated hardware validation, and refined error handling for detumble and PID experiments. This work, combined with refactoring ADCS.C to call modular functions, improves testability, reduces integration risk, and accelerates experimental cycles. The commit bceb772be200568efbcc2cc729cca5600ea269d2 documents the function-call refactor.
October 2025
February 2025
3 Commits • 2 Features
Feb 1, 2025February 2025 performance summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software. Focused on enabling safe, autonomous detumbling and providing foundational coil actuation groundwork. Key outcomes include groundwork for coil control in virtual_intellisat, improved detumbling control with bias and current limiting, and a startup bug fix to ensure correct detumble initialization. These changes enhance attitude control reliability, operational safety, and readiness for upcoming mission phases.
February 2025
3 Commits • 2 Features
Feb 1, 2025February 2025 performance summary for Space-and-Satellite-Systems-UC-Davis/ADCS-Software. Focused on enabling safe, autonomous detumbling and providing foundational coil actuation groundwork. Key outcomes include groundwork for coil control in virtual_intellisat, improved detumbling control with bias and current limiting, and a startup bug fix to ensure correct detumble initialization. These changes enhance attitude control reliability, operational safety, and readiness for upcoming mission phases.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 Monthly Summary — Space-and-Satellite-Systems-UC-Davis/ADCS-Software Focused on strengthening the detumbling capability by deriving angular velocity from magnetic field readings rather than relying on a direct get_angvel call. This update makes detumbling more self-contained, robust, and testable, with internal data derivation and added helper functions for angular velocity calculation and threshold checks.
1 Commits • 1 Features
Jan 1, 2025January 2025 Monthly Summary — Space-and-Satellite-Systems-UC-Davis/ADCS-Software Focused on strengthening the detumbling capability by deriving angular velocity from magnetic field readings rather than relying on a direct get_angvel call. This update makes detumbling more self-contained, robust, and testable, with internal data derivation and added helper functions for angular velocity calculation and threshold checks.
January 2025
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Quality Metrics
Correctness87.0%
Maintainability86.2%
Architecture85.8%
Performance82.6%
AI Usage21.4%
Skills & Technologies
Programming Languages
CMakefileMarkdownYAML
Technical Skills
Aerospace EngineeringC ProgrammingC programmingC/C++CI/CDControl SystemsEmbedded SystemsGCCGitHub ActionsMakefilealgorithm designalgorithm developmentalgorithm optimizationbuild automationbuild configuration
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