Leonel Mazal

Leonel Mazal

About

12
Publications
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161
Citations

Publications

Publications (12)
Article
Full-text available
Space debris accumulation is on the rise as commercial space applications become more affordable and existing satellites near the end of their operational lifetimes. For geosynchronous equatorial orbits, solar radiation pressure provides a unique solution for the removal of larger debris such as inoperable satellites. Given the current state of the...
Article
Full-text available
Spacecraft equipped with the capability to vary their ballistic coefficient can use differential drag as the control force to perform propellant-less relative maneuvers. Because atmospheric drag is proportional to atmospheric density, uncertainty in atmospheric density makes the generation and tracking of drag-based guidances difficult. Spatio-temp...
Article
Full-text available
At low Earth orbits, differentials in the drag forces between spacecraft can be used for controlling their relative motioninthe orbitalplane. Current methods for determining the drag force may resultinerrors duetoinaccuracies in the density models and drag coefficients. In this work,a methodology for relative maneuveringof spacecraft based on diffe...
Article
Full-text available
When a group of satellites is equipped with a particularly simple propulsion system (e.g., cold-gas thrusters), constraints on the thrust level and total propellant mass renders cluster keeping extremely challenging. This is even more pronounced in disaggregated space architectures, in which a satellite is formed by clustering a number of heterogon...
Article
Full-text available
Cluster flight is a term used for describing multiple satellites that are being held within pre-defined minimum and maximum distances for long time intervals, possibly the entire mission. This technology is required for a myriad of space architectures and missions, including disaggregated space architectures. Whereas the literature is abundant with...
Article
Full-text available
In disaggregated satellites, the functional capabilities of a single monolithic satellite are distributed among multiple free-flying, wirelessly communicating modules. One of the main challenges associated with disaggregated satellites is cluster flight, i.e., keeping the modules within a bounded distance, typically less than 100 km, for the entire...
Article
Space Autonomous Mission for Swarming and Geolocation with Nano-satellites (SAMSON) is a new satellite mission, led by the Distributed Space Systems Lab at the Technion - Israel Institute of Technology. SAMSON will include three nanosatellites, built based on the CubeSat standard. The mission is planned for at least one year, and has two main goals...
Conference Paper
The basic idea behind disaggregated satellites is to distribute the functionality of a single monolithic satellite among multiple physically-separated inter-communicating modules. The research described in this paper develops optimal guidance laws aimed at keeping the relative distances between the modules bounded for extended mission lifetimes whi...
Article
Full-text available
Space Autonomous Mission for Swarming and Geolocation with Nanosateliites (SAMSON) is a new satellite mission, led by the Distributed Space Systems Lab at the Technion - Israel Institute of Technology. SAMSON will include three nanosateliites, built based on the CubeSat standard. The mission is planned for at least one year, and has two main goals:...
Article
The main idea of disaggregated satellites is to distribute the functionality of a single monolithic satellite among multiple physically-independent wireless-communicating modules. These new architectures raises the emerging concept of cluster flight, in which the distance between any two modules of the cluster must be kept between prescribed upper...
Article
Full-text available
Article presents a closed-form solution of the optimal biimpulsive transfer between coplanar initial and terminal orbits for satellites exerting thrust by using three orthogonal thrusters aligned with the local-vertical local-horizontal frame. Coplanar maneuvers usually consume less propellant than more general transfers wherein the orbital planes...
Article
Fractionated spacecraft constitutes a satellite design methodology wherein the functional capabilities of a single monolithic satellite are distributed among multiple free-flying, wirelessly-communicating modules. One of the main challenges of a fractionated spacecraft system is cluster flight, i.e. keeping the various modules within a bounded dist...

Questions

Question (1)
Question
Given a nonlinear dynamical system
\dot{x} = f(x)
y = h(x)
whose output y has dimension larger than the state vector x. Is the system necessarily observable? What are the other necessary or sufficient conditions?

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Projects

Project (1)
Project
SAMSON will include autonomous 6U cubesats that will demonstrate long-term cluster flight and perform high-accuracy geolocation. Technion's Asher Space research Institute leads the project, with many collaborators from the industry and academia. The launch is planned in 2017. Most of the algorithms (cluster flight, differential drag, geolocation, attitude control) have been designed by Technion grad students.