Pytellite is an open-source tool for quickly testing and visualizing satellite attitude control laws in a web app. Additionally, it can synthesize realistic noisy gyro and startracker measurements and run a Kalman filter to estimate the attitude (specifically an error state multiplicative extended Kalman filter). It supports nonlinear controllers based on error quaternion and angular rate feedback for inertial pointing with reaction wheels. As of late September 2025, I am adding functionalities to this project on a weekly basis and I have many ideas I want to implement, so stay tuned! You can find more information on the project here. 

I implemented an error-state multiplicative extended Kalman filter (MEKF) for attitude determination to carry out software-in-the-loop simulations. You can find the source code here. The filter assumes a satellite equipped with gyroscopes and a star tracker (or another attitude sensor), providing noisy angular rate and attitude measurements, respectively. Gyroscope outputs are modeled with white noise (angle random walk, ARW) and bias drift, the latter represented as a Wiener process (rate random walk, RRW). Star tracker measurements are modeled by injecting a white noise quaternion multiplicatively into the true attitude quaternion. Virtually the same algorithm found in this project is implemented on Pytellite, the main difference being that here the angular velocity history is provided by the user, while in Pytellite it is calculated from the system dynamics.

The full algorithm is a bit too long to detail here, but I have written a dedicated page on the theory behind it in the project’s documentation.

Below are example outputs from the code: the time evolution of the bias and attitude estimation errors relative to ground truth.

Trada calculates impulsive transfers to all known small bodies in the Solar System by solving the Lambert problem and storing the trajectories on a SQL database. Ephemerides are imported from JPL's Small-Body Database. A local web-based GUI allows to search candidate bodies within the user's requirements of time-of-flight, departure trajectory direction and dates, delta v, amongst other settings. It can also show Pareto fronts, porkchop plots, and more plots. I created this tool during my stay at JAXA as a Visiting Scholar in 2020. The app was mostly developed in Python, with Dash/Plotly for the web app.

I co-founded and led the engineering team of Cosmic Research from its inception in 2016 until mid 2019. Cosmic Research is a student rocket team that develops solid rocket motors sounding rockets for peaceful applications. Below are pictures of the culmination of our work, the test of the Nebula-III, a 10 kN solid rocket motor I co-led the design of (along with Xavier López).

Static test of Nebula-III 

Before Nebula-III, we designed and tested many other smaller solid rocket motors, learning from each success and failure. 

This course covers everything from aerodynamics of sounding rockets to flight instability induced by pitch-roll resonance. Examples of topics covered are subsonic and supersonic models of drag and lift of fins and body sections, analysis of flight dynamics, and trajectory simulation. You can find the link to the 10h course here.