Serwis Infona wykorzystuje pliki cookies (ciasteczka). Są to wartości tekstowe, zapamiętywane przez przeglądarkę na urządzeniu użytkownika. Nasz serwis ma dostęp do tych wartości oraz wykorzystuje je do zapamiętania danych dotyczących użytkownika, takich jak np. ustawienia (typu widok ekranu, wybór języka interfejsu), zapamiętanie zalogowania. Korzystanie z serwisu Infona oznacza zgodę na zapis informacji i ich wykorzystanie dla celów korzytania z serwisu. Więcej informacji można znaleźć w Polityce prywatności oraz Regulaminie serwisu. Zamknięcie tego okienka potwierdza zapoznanie się z informacją o plikach cookies, akceptację polityki prywatności i regulaminu oraz sposobu wykorzystywania plików cookies w serwisie. Możesz zmienić ustawienia obsługi cookies w swojej przeglądarce.
Batteries have seen an increased use in electric ground and air vehicles for commercial, military, and space applications as the primary energy source. An important aspect of using batteries in such contexts is battery health monitoring. Batteries must be carefully monitored such that the battery health can be determined, and end of discharge and end of usable life events may be accurately predicted...
In the space community, there is a strong interest in formation flying or swarm missions with small satellites. This could open the door to new exciting applications in earth observation, telecommunication or in-orbit servicing. Such missions are expected to have important benefits in terms of low system and deployment costs, distributed sensor capability or high reliability due to redundancy. In...
The concept of Mars Sample Return (MSR) has been considered since the 1960s and is still a top priority for the planetary science community. [1] Although a plan on the number and types of samples to be collected for MSR has been outlined, as articulated in the Mars 2020 Science Definition Team report [2], the trade space of options to return this sample from the surface of Mars to the surface of the...
Small satellite missions are becoming increasingly complex as scientists and engineers propose to utilize them to accomplish more ambitious science and technology goals. Small satellites such as CubeSats are challenging to design because they have limited resources, coupled subsystems, and must operate in dynamic environments.
This paper details the lessons learned during the testing and flight of a 3U modular payload in an innovative new dispenser. The Canisterized Satellite Dispenser (CSD) has many features beyond typical CubeSat dispensers. The primary benefit is the payloads are preloaded to the dispenser, creating a secure load path that is modelable and facilitates accurate prediction of the payload's flight environments...
Pneumatic-actuated valves play an important role in many applications, including cryogenic propellant loading for space operations. Model-based prognostics emphasizes the importance of a model that describes the nominal and faulty behavior of a system, and how faulty behavior progresses in time, causing the end of useful life of the system. We describe the construction of a testbed consisting of a...
The National Aeronautics and Space Administration (NASA) Cyclone Global Navigation Satellite System (CYGNSS) mission aims to understand the coupling between ocean surface properties, moist atmospheric thermodynamics, radiation, and convective dynamics in the inner core of tropical cyclones (TCs). The mission is comprised of eight microsatellites (μSats) in low-earth orbit (LEO) at an inclination of...
This paper describes research efforts to mitigate weaknesses in a TMR+spares radiation tolerant SRAM-based FPGA computer system. An existing 9-tile Microblaze architecture is reviewed and the desired improvements of fault-mitigated routing, fault location determination and performance enhancement via runtime-configurable hardware accelerators are discussed. Hamming encoding is proposed as a method...
Mountain glaciers around the globe are retreating rapidly, but the exact mechanisms causing the retreat are not well understood. Is warming of the atmosphere the key driver? What are the roles of changes in surface albedo due to contaminants and snow optical grain size and surface roughness? Improved understanding of the response of mountain glaciers to global and environmental change is key to answering...
On September 21st, 2013, the High Energy Replicated Optics to Explore the Sun, or HEROES, balloon-borne x-ray telescope launched from the Columbia Scientific Balloon Facility's site in Ft. Sumner, NM. The flight lasted for ∼27 hours and the observational targets included the Sun and astrophysical sources GRS 1915+105 and the Crab Nebula. Over the past year, the HEROES team upgraded the existing High...
This work compares the design and performance of three ionospheric gradient monitors, based on code-only observations, on phase-only observations and on the combination of both observables. It is shown that the detection capabilities are considerably enhanced by exploiting carrier-phase measurements. However, these are ambiguous by an unknown number of integer cycles, and differential ionospheric...
Large aerospace organizations typically spend significant resources in optimizing system design by means of specialized software (e.g., computer-aided design, simulation). Conversely, architectural decisions are made much faster, with far less resources, and typically, in a much less structured way. This is despite clear indications that architectural decisions fix many design decisions, and have...
This paper examines metaheuristic cost effectiveness optimization across collections of disaggregated space systems. Within the systems engineering community, there has been a realization that organizations optimize individual systems performance and manage system-specific cost, schedule and risks, with comparatively little regard to the holistic System-of-Systems (SOS) context. Optimization of individual...
This paper describes a concept to demonstrate the operation of an advanced power supply (known as ASRG) in space for an extended period of time as a hosted payload. The demonstration unit will test the highest risk technologies associated with the Advanced Stirling Radioisotope Generator (ASRG) design while eliminating the complexities and cost associated with the already demonstrated General Purpose...
In July of 2013, U.S. Congressman Kennedy (D-Mass.) successfully offered an amendment to H.R. 2687, the National Aeronautics and Space Administration Authorization Act of 2013. “International Participation—The President should invite the United States partners in the International Space Station program and other nations, as appropriate, to participate in an international initiative under the leadership...
Distributed Space Missions (DSMs) are gaining momentum in their application to Earth science missions owing to their ability to increase observation sampling in spatial, spectral, temporal and angular dimensions. Past literature from academia and industry have proposed and evaluated many cost models for spacecraft as well as methods for quantifying risk. However, there have been few comprehensive...
We propose two methods of nullsteering for a compact analog uniform circular array system. One method is based on switched beam. The predefined null patterns were generated by nullsteering algorithms and saved in the array system. The second method is based on adaptive array. A single channel receiver and A/D converter were added to the analog array output for adaptive array processing. Therefore,...
The performance of a 127 element phased array laser system is simulated for the case of an extended target in the presence of strong atmospheric turbulence. The phases of the individual sub-apertures of a phased array laser system can be controlled to compensate for the beam quality degradation caused by atmospheric turbulence. This is done by setting the phases of the sub-apertures to the conjugate...
The TET (TechnologieErprobungsTräger - Technology Experiment Carrier) satellite bus was designed as a modular and flexible bus for LEO (Low Earth Orbit) missions. Its first mission was the TET-1 satellite which was part of the OOV (On Orbit Verification) program of the DLR (German Aerospace Center) and was launched on July 22nd 2012. The next mission for the TET bus is the BIROS satellite which is...
THEMIS, a constellation of five spacecraft, referred to as probes, was launched in 2007 to study the physical processes leading to the aurora. In 2009, THEMIS successfully completed its primary mission phase. As an ambitious mission extension, the constellation was then split into two new missions - THEMIS-Low and ARTEMIS. THEMIS-Low refers to three of the five probes that continued magnetospheric...
Podaj zakres dat dla filtrowania wyświetlonych wyników. Możesz podać datę początkową, końcową lub obie daty. Daty możesz wpisać ręcznie lub wybrać za pomocą kalendarza.