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This paper describes the lessons learned in early operations of the Juno spacecraft from launch through the Deep Space Maneuvers and Earth Flyby, covering approximately the first two years of the mission.
STUDSAT-1 is the first pico-satellite developed in India by the undergraduate students from seven engineering colleges across South India. After the successful launch of STUDSAT-1 on 12th July, 2010, the team is developing STUDSAT-2 which is India's first twin satellite mission. STUDSAT-2 is undertaken by the undergraduate students from seven engineering colleges from the State of Karnataka, India...
The paper describes a multiscale turbulence prediction and alert system for airports in hilly regions. The system has been approved by the Norwegian Civil Aviation Authority (NCAA) and has been fully operational since 1st July 2009. The article starts with a brief theoretical description of the system developed and implemented at 20 Norwegian airports located in hilly regions. The brief description...
A design reference mission (MASER - Meteorology and Seismology Enabled by Radioisotopes) for a Mars mini-network is presented. Four hard landers using parachutes and crushable impact attenuators would be deployed in the polar plains north of the Tharsis bulge to perform seismic and meteorological measurements throughout a Martian year (including the dark winter). Operation throughout the polar winter...
A critical resource for meeting the challenges of human exploration beyond near Earth orbit is greater reliance on spacecraft automation. If human-automation integration is not appropriately designed, however, increased automation may contribute to rather than alleviate these challenges. TRACLabs and San Jose State University are investigating the hypothesis that selecting units of work for automation...
Pushed by digital systems development and the pressure to reduce costs, in the last 40 years health monitoring (Hm) capabilities evolved from simple Built In Tests to system health prognostics, causing the development of new maintenance and operation concepts and new business models. Hm functions allow business growth by maximizing availability, optimizing the logistics, improving productivity and...
Modern space electronics used in satellites are vulnerable to performance degradations and even system failure due to exposure to highly energized charged particles, such as electrons and protons originating from solar particle events, galactic cosmic rays, and trapped particles in the Van Allen Belts. The compact, radiation hard, detector system reported here distinguishes between electron events...
This paper explores a novel stochastic optimal control method to determine conflict-free 4D (3D space and time) trajectories by considering uncertainties during flight. 4D trajectory management is a necessary concept to meet future growth in air traffic. However, aircraft may deviate from its planned 4D trajectory due to uncertainties during flight, and a conflict between aircraft can occur and lead...
The overall performance of an Air Defense Missile System (ADMS), identified as the probability of hit (PoH) performance, is evaluated using full grid analysis approach and response surface approach. For this purpose, a very detailed six degrees of freedom missile simulation model is employed, which contains over 1000 parameters. These parameters are varied with prescribed uncertainties for performing...
The Variable Vector Countermeasure Suit (V2Suit) is a wearable intravehicular system that will provide a viscous resistance to movements that are parallel to a specified direction of ‘down.’ The V2Suit utilizes control moment gyroscopes (CMGs) in modules on the user's limbs that are commanded to point the gyroscopic torque vector perpendicular to ‘down’ during movements. An algorithm has been developed...
The John D. Odegard School Of Aerospace Sciences at the University of North Dakota operates flight training centers at a variety of locations, including at the Grand Forks International Airport | Mark Andrews Field (GFK). The Grand Forks operation includes a fleet of 116 aircraft and conducts approximately 120,000 flight hours per year. With students tasked to certain training exercises in certain...
Mars Atmosphere and Volatile EvolutioN (MAVEN) is the first mission to focus its study on the Mars upper atmosphere. MAVEN will study the evolution of the Mars atmosphere and climate, by examining the conduit through which the atmosphere has to pass as it is lost to the upper atmosphere. An analysis was performed for the MAVEN mission to address two distinct concerns. The first goal of the analysis...
For Orion missions beyond low Earth orbit (LEO), the Guidance, Navigation, and Control (GN&C) system is being developed using a model-based approach for simulation and flight software. Lessons learned from the development of GN&C algorithms and flight software for the Orion Exploration Flight Test One (EFT-1) vehicle have been applied to the development of further capabilities for Orion GN&C...
The Precision Tracking Space System (PTSS) was to be a multiple-spacecraft constellation to enable post-boost intercept of ballistic missiles and increase missile raid handling capacity of the Ballistic Missile Defense System. The PTSS requirements, operational concept, and system baseline development were conducted by a Laboratory team lead by The Johns Hopkins University Applied Physics Lab (APL)...
In recent years there has been an increasing demand of systems that automatically manage and control the state of large critical areas, such as airports, harbors, parking lots, etc. The framework of the Bayesian Factor Graphs to target fusion seems to be quite promising with respect to classical approaches because of its modularity and because it can naturally integrate very heterogeneous sources...
Many CubeSats use magnetic torquers for attitude control. Many of these same CubeSats use a magnetometer as the primary sensor for attitude determination. This results in a conflict where the actuators in the system corrupt the feedback measurements. Two common approaches to solve this problem are to physically separate the torquers and magnetometer by putting the magnetometer on a boom, or to separate...
This paper describes the design decisions taken and the mass properties tracking and testing flow chosen for the Van Allen Probes spacecraft and their deployable systems to achieve the coning angle requirements. Topics include a list of major requirements, a brief description of the error budget, a description of the tracking process of the spacecraft mass properties prior to test, a description of...
In this paper, a printed circuit board (PCB) carrying surfacemounted devices (SMD) subjected to impact or vibration loads applied to its support contour is considered. A model-based prognosis approach is employed to assess the remaining useful life (RUL) of the ball-grid-array (BGA) solder joint interconnections. The approach deals with the interaction (coupling) of the “fast” PCB vibration model...
This paper presents the design of an attitude determination system from a small satellite perspective that automatically corrects for attitude drift using relative attitude measurements generated using a small imager. The visual attitude propagation approach, referred to as the “stellar gyroscope”, is a star imaging system that generates relative attitude measurements between star field images with...
Over the past decade, several NASA Mars orbiters - Mars Global Surveyor, 2001 Mars Odyssey, and the Mars Reconnaissance Orbiter - along with ESA's Mars Express orbiter, have provided telecommunications relay services to a series of Mars landers, including the Mars Exploration Rovers (Spirit and Opportunity), the Phoenix Lander, and the Mars Science Laboratory's Curiosity Rover. For each of these missions,...
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