At least part of the modern agricultural revolution that is now keeping a few billion people from starving to death can be attributed to remote sensing of fields and crops. Images from Landsat and other earth imaging satellites have been used by farmers and anyone interested in agriculture policy for forty years now, and these strange, false-color pictures are an invaluable resource for keeping the world’s population fed.
The temporal resolution of these satellites is poor, however; it may be a few weeks before an area can be imaged a second time. For some uses, that might be enough.
For his Hackaday Prize entry (and his university thesis), [David] is working on attaching the same kinds of multispectral imaging payloads found on Earth sensing satellites to a UAV. Putting a remote control plane up in the air is vastly cheaper than launching a satellite, and being able to download pictures from a thumb drive is much quicker than a downlink to an Earth station.
Right now, [David] is working with a Raspberry Pi and a camera module, but this is just experimental hardware. The real challenge is in the code, and for that, he’s simulating multispectral imaging using Minecraft. Yes, it’s just a simulation, but an extremely clever use of a video game to simulate flying over a terrain. You can see a video of that separated into red, green, and blue channels below.
Continue reading “Hackaday Prize Entry: Multispectral Imaging For A UAV”
Unmanned Aerial Vehicles (UAV) are all the rage these days. But while today’s combative UAV technology is as modern as possible, the idea itself is not a new one. Austria floated bomb-laden balloons at Venice in the middle 1800s. About a hundred years later during WWII, the Japanese used their new-found knowledge of the jet stream to send balloons to the US and Canada.
Each balloon took about four days to reach the western coast of North America. They carried both incendiary and anti-personnel devices as a payload, and included a self-destruct. On the “business end” of the balloons was the battery, the demolition block, and a box containing four aneroid barometers to monitor altitude. In order to keep the balloons within the 8,000 ft. vertical range of the jet stream, they were designed to drop ballast sandbags beginning one day into flight using a system of blow plugs and fuses. In theory, the balloon has made it to North American air space on day four with nothing left hanging but the incendiaries and the central anti-personnel payload.
Although the program was short-lived, the Japanese launched some 9,300 of these fire balloons between November 1944 and April 1945. Several of them didn’t make it to land. Others were shot down or landed in remote areas. Several made the journey just fine, and two even floated all the way to Michigan. Not bad for a rice paper gas bag.
Continue reading “Retrotechtacular: Using the Jet Stream for Aerial Warfare”
Is it a quadcopter? A plane? No, it’s both! [Daniel Lubrich] is at it again with a vertical take off and landing transformer he calls the SkyProwler.
The SkyProwler uses a switch blade type mechanism to move from quadcopter mode to plane mode. The wings can be detached to make it a normal quad that has all the typical bells and whistles. It can follow you around with GPS, fly autonomously via way points, and has this cool gimbal mechanism that keeps the GoPro stable as the drone pitches in flight, allowing for a better video experience.
[Dan’s] ultimate goal is a full size passenger model called the SkyCruiser, which uses the same switchblade transformation mechanism as his much smaller SkyProwler. Be sure to check out the video below if you haven’t already, and let us know of any quadcopter / plane hybrids of your own.
Correction: We previously associated [Daniel Lubrich] with the ATMOS program. This was in error and has been removed from the article. The ATMOS UAV is a separate project which we previously covered.
Continue reading “Quadcopter Plane Transformer is Awesome”
A team of engineers from the Advanced Manufacturing Research Centre at the University of Sheffield have just put the finishing touches on their 3D printed Flying Wing with electric ducted fan engines — a mini electric jet so to speak.
Earlier this year they had created a completely 3D printed fixed wing UAV, which the new Flying Wing is based off of. Designed specifically for the FDM process, they were able to optimize the design so that all parts could be printed out in 24 hours flat using ABS plastic.
The new design also almost exclusively uses FDM technology — however the wings are molded carbon fibre… using a 3D printed mold of course! The original glider weighed 2kg, and with the upgrades to the design, the Flying Wing weighs 3.5kg, with speed capabilities of around 45mph.
Continue reading “Flying Wing Project uses 3D Printing to Reach New Heights”
Somewhere between San Diego and South Carolina is an unmanned aerial vehicle attempting to make the first autonomous flight across the United States. The plane is electric and requires a landing and battery swap every hour or so, however the MyGeekShow guys are so far the only non-military entity to attempt such an ambitious flight.
The plane making the multiple flights is a Raptor 140 capable of cruising at 75 kph for about an hour before requiring a battery swap. Ground control is an RV, loaded up with LCDs and radios; as long as the RV is within a kilometer or so of the plane, the guys should be able to have a constant telemetry link.
Already the guys at MyGeekShow have pulled off a 52 km autonomous flight, following their flying wing in a car. Even though a hard landing required swapping out the carbon fiber spar for an aluminum one, the plane making the truly cross-country flight is still in good condition, ready to land on a South Carolina beach within a week.
You can follow the trip on the MyGeekShow Twitter. The guys are pulling off an incredible amount of updates and even a few live streams from the mobile command station.
UPDATE: It crashed. Tip stalls aren’t your friend, and undercambered wings exist. Good try, though.
In the world of drones, quadcopters, and unmanned aerial vehicles, the community has pretty much settled on AVR microcontrollers for the low end, and ARM for the high performance boards. If the FAA doesn’t screw things up, there will soon be another market that requires even more computational power, and Navio, the autopilot shield for the Pi, is just the thing for it.
Where high end multicopter and autopilot boards like the OpenPilot Revolution use ARM micros, there’s a small but demanding segment of the hobby that needs even more processing power. Think of something like the Outback Challenge, where fixed-wing drones search the desert for a lost mannequin autonomously. You’re going to need OpenCV for that, and that means Linux.
Navio is a shield for the Raspberry Pi, complete with a barometric pressure sensor, gyros, accelerometer, and compass, and GPS. It’s designed to run a more real-time version of Linux, and has the ability to do some interesting telemetry configurations – putting a 3G modem on the Navio isn’t much of a problem, and since it’s a Raspi, doing image processing of a downward facing camera is just a matter of writing the code.
The Navio team is currently running an Indiegogo campaign, with the baseline version available for $145. That’s pretty close to the price of the OpenPilot Revolution. There’s also a version upgraded with the U-blox NEO-6T that allows for on-board processing of raw GPS data.
When [Edward Snowden] smeared the internet with classified NSA documents, it brought to light the many spying capabilities our government has at its disposal. One the most interesting of these documents is known as the ANT catalog. This 50 page catalog, now available to the public, reads like a mail order form where agents can simply select the technology they want and order it. One of these technologies is called the Sparrow II, and a group of hackers at Hyperion Bristol has attempted to create their own version.
The Sparrow II is an aerial surveillance platform designed to map and catalog WiFi access points. Think wardriving from a UAV. Now, if you were an NSA agent, you could just order yourself one of these nifty devices from the ANT catalog for a measly 6 grand. However, if you’re like most of us, you can use the guidance from Hyperion Bristol to make your own.
They start off with a Raspi, a run-of-the-mill USB WiFi adapter, a Ublox GY-NEO6MV2 GPS Module, and a 1200 mAh battery to power it all. Be sure to check out the link for full details.
Thanks to [Joe] for the tip!