منابع مشابه
Determining position, velocity and acceleration of free-ranging animals with a low-cost unmanned aerial system.
Unmanned aerial systems (UASs), frequently referred to as 'drones', have become more common and affordable and are a promising tool for collecting data on free-ranging wild animals. We used a Phantom-2 UAS equipped with a gimbal-mounted camera to estimate position, velocity and acceleration of a subject on the ground moving through a grid of GPS surveyed ground control points (area ∼1200 m(2))....
متن کاملTemporal Variations of the Earth's Gravitational Field from Satellite Laser Ranging to Lageos
We have estimated monthly values of the J2 and J3 Earth gravitational coefficients using LAGEOS satellite laser ranging (SLR) data collected between 1980 and 1989. For the same time period, we have also computed corresponding estimates of the variations in these coefficients caused by atmospheric mass redistribution using surface atmospheric pressure estimates t3⁄4om the European Center for Med...
متن کاملLow Cost Indoor Positioning System
This report describes a low cost indoor position sensing system utilising a combination of radio frequency and ultrasonics. Using a single rf transmitter and four ceiling mounted ultrasonic transmitters it provides coverage in a typical room in an area greater than 8m by 8m. As well as finding position within a room, it uses data encoded into the rf signal to determine the relevant web server f...
متن کاملGravitomagnetism and its Measurements with Lunar Laser Ranging, LAGEOS Satellites and Gravity Probe B
It is sometimes claimed that gravitomagnetism, measured by the LAGEOS satellites using the GRACE models [Ciufolini and Pavlis 2004], that might also be detected by refining the Gravity Probe B data analysis [Muhlfelder, Keiser and Turneaure 2007], has already been observed by Lunar Laser Ranging, LLR [Murphy, Nordtvedt and Turyshev 2007]. Here we show that there are two types of gravitomagnetic...
متن کاملA Low Cost Automatic Detection and Ranging System for Space Surveillance in the Medium Earth Orbit Region and Beyond
The space around the Earth is filled with man-made objects, which orbit the planet at altitudes ranging from hundreds to tens of thousands of kilometers. Keeping an eye on all objects in Earth's orbit, useful and not useful, operational or not, is known as Space Surveillance. Due to cost considerations, the space surveillance solutions beyond the Low Earth Orbit region are mainly based on optic...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1979
ISSN: 0074-1809
DOI: 10.1017/s0074180900036305