(Credit:
MIT)
Micro Air Vehicles (MAVs) may be small, but they're costly, so researchers have devised ways for them to fly in GPS-denied urban and indoor environments where they could otherwise get lost or crash.
Existing highly-precise, non-GPS navigation units are too large, heavy, and expensive to install on an MAV. But the Robust Robotics Group at MIT's Computer Science and Artificial Intelligence Laboratory addressed this problem by developing algorithms that allow a miniature robo-quadrocopter to estimate their relative position, identify a clear path and then fly through dense air space.
"The size, weight, and budget limitations of micro air vehicles (MAVs) typically preclude high-precision inertial navigation units that can mitigate the loss of GPS," according to the MIT release. "We are developing estimation and planning algorithms that allow MAVs to use environmental sensors such as range finders to estimate their position, build maps of the environment, and fly safely and robustly."
The laser range-finder estimates the MAV's position, yaw angle, and altitude information from surrounding landscape out to about a 12 foot range.
In recent tests, the MAV navigated cluttered offices and unknown hallways and found its way through other unmapped environments by using its onboard laser scanners and cameras to build its own map, according to MIT.
MIT's secret sauce is based on the Belief Roadmap (BRM) algorithm, which performs searches in the MAV's "information space" to determine the "minimum expected cost path for the vehicle," according to a learned paper on the subject. Anything that mentions the Unscented Kalman Filter is worth a click.(PDF)
(Credit:
ISAE)
It may look like something your kids brought home from shop class, but this rugged, French-designed micro air vehicle (MAV) could be a missing link between smooth, steady hover and fast, forward flight.
The inventor, Dr. Jean-Marc Moschetta, professor of aerodynamics at the Institut Superieur de l'Aeronautique et de l'espace in Toulouse, France, created what he calls the MAVion with both commercial and military markets in mind.
A mere 30 centimeters long, the MAVion combines fixed wings with two counter rotating propellers, allowing it to operate with high aerodynamic efficiency--even in adverse conditions, according to the professor.
"The ultimate goal of the MAVion concept is to demonstrate a twofold capability using the same vehicle: fast forward flight and hover flight," Moschetta explained. "The two counter-rotating tandem propellers provide a simple means to enhance yaw control, which is particularly important in vertical flight."
"The global vision for developing the bimotor MAVion is to provide a fixed-wing aircraft that can be easily upgraded for hover, but also for rolling on the ground or along walls by adding wheels on either side," he said.
The project, funded by the European Office of Aerospace Research and Development in London and the French military, took top honors at the International Micro Air Vehicle Flight Competition held in Pensacola, Fla., this year.
(Credit:
ISAE)
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