In recent decades, drag-free satellites have been used in high-precision missions, such as testing the general relativity, verifying the geodetic and frame-dragging effects, measuring Earth's gravity field, etc. In space gravitational wave detection, drag-free satellites play an important role.
Previous research on the drag-free satellite has focused on the drag-free control algorithm. Nevertheless, science mode and nonscience mode have different control forces, sensor measurement range, measurement noise, and reaction force noise. Therefore, the different controllers for the capture control mode and the high-accuracy control mode of the test mass need to be designed.
However, it is easy to cause system instability or even uncontrollability when switching between different controllers. Research on the switching control between different modes is very important. In the drag-free satellite, there is little research on the switching control between different modes. Multi-degree of freedom strong coupling and controller saturation remains an urgent problem to be solved.
First, authors give the reference coordinate system and dynamics models. In space gravitational wave detection, the drag-free satellite has 2 cubic TMs with an angle of 60° between them . Three reference coordinate systems are used . The inertial reference coordinate system is the Earth mean equator J2000 coordinates.
Ireland Latest News, Ireland Headlines
Similar News:You can also read news stories similar to this one that we have collected from other news sources.
Study by La Jolla scientists shows how strong-swimming plankton create red tides'The Michael Phelps of plankton' can swim vertically and quickly between sunlight at the ocean surface and nutrients at the bottom to fuel their growth and enable them to congregate in large numbers
Read more »
Unlocking Earth’s Ancient Secrets: New Study Rewrites Our Understanding of Earth’s Deep Carbon and Chlorine CyclesA recent study led by Macquarie University earth scientist Dr. Chunfei Chen sheds new light on geological processes from up to three billion years ago and marks a significant shift in the scientific community's understanding of the early Earth. Recently published in the journal Nature, the research
Read more »
'G.O.D.S Walk Among Us': Marvel's Cosmic Gods Reveal Their Secret 'Peter Parker' IdentitiesG.O.D.S. walk among the heroes of Earth.
Read more »
Astronauts on ISS can face muscle loss in microgravity – a new ESA experiment may helpThe method works on Earth, could it work in space too?
Read more »
Four astronauts return to Earth in SpaceX capsule to wrap up six-month station missionFour astronauts returned to Earth early Monday after a six\u002Dmonth stay at the International Space Station
Read more »
‘Earth-like’ Planet Nine could be hiding in our solar system: new researchWhile some astronomers remain unconvinced that such a plant exists, this new work isn’t the first to posit the existence of a ninth planet in our cosmic community.
Read more »