Sense and Avoid...interesting article

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Just came out in GCN (Government Computer News):

What's Keeping Drones From Taking Off?

While the FAA’s proposed rule is a step forward, it requires that drones weigh under 55 pounds and be flown in daylight within the line of sight of the operator without the use of visual aids such as binoculars. The agency cited two main safety concerns:

Collision avoidance – The UAS operator must be able to see manned aircraft in the air in time to prevent a mid-air collision between the small unmanned aircraft and another aircraft. The FAA said it believes  “the equipment required to utilize these widely available technologies is currently too large and heavy to be used in small UAS operations.”

Loss of positive control – The UAS operator must be able to control the drone even if there was a failure of the control link between the aircraft and the operator’s control station. “A small unmanned aircraft whose flight is unable to be directly controlled could pose a significant risk to persons, property or other aircraft,” the FAA said.

While these safety concerns will keep drone delivery services from taking off any time soon, the sense and avoid technology the FAA is looking for has been maturing.

Sense and avoid technology has been deployed for some time on larger and smallermilitary drones.  In fact, drone maker General Atomics Aeronautical Systems recently said it has flight-tested an early version of a sense-and-avoid radar mounted on its 10,000-pound military drone, Defense Systems reported. The systems are generally interoperable with traffic alert and collision avoidance systems (TCAS) used in most commercial aircraft, which alerts pilots when objects are approaching. 

However, sense and avoid technologies on drones weighing less than 55 pounds is much less common. The semi-autonomous technology would allow drones to fly safely outside the line of sight of the operator.  Some recent developments include:

Airware, creator of a hardware, software, and cloud services platform for commercial drone development and operation, is developing an Aerial Information Platform for the development and operation of UAVs. The company is working with NASA on a set of prototype air traffic management systems to test the limits of using low-altitude drones in commercial airspace.

The first prototype on the NASA project is an Internet-based system that would give drone operators information on oncoming obstacles, such as bad weather and physical obstructions, based on the flight plan filed. Eventually, more sophisticated feedback systems are envisioned that could actively manage the airspace by, for example, sending requests for groups of drones to spread out to avoid oncoming traffic.

Skydio, a drone start-up based in Menlo Park, Calif., has a prototype of an obstacle-avoidance system that relies on computer vision (shown above). It hopes to have it in users’ hands over the next 12 months, the Washington Post reported

Meanwhile, researchers at the University of Denver’s Unmanned Systems Research Institute have developed a phased-array radar system that only weighs 12 ounces.  The radar based system has advantages over transponder or camera systems, it’s developers said, because it works where there is poor visibility – at night or in bad weather. The technology was licensed in April to Integrated Robotics Imaging Systems in Kenai, Alaska, which will be testing it on its Infotron IT180, a French-made, dual-rotor unmanned platform.

The goal for the near term is to outfit smaller drones with artificial situational awareness, which might help to address safety concerns from the FAA.  This could be especially true for government agencies as they will also be permitted to operate drones under the FAA’s proposed rule, though, with the same line of sight restriction.

 

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Comments

  • @Adam - I think you're referring to using the LIDAR for absolute mapping capability but I would really like to see collision avoidance as the primary role with mapping as secondary. Integrating sensors like this one are a "chicken and egg" situation and as things stand at the moment the FAA thinks:

    “the equipment required to utilize these widely available technologies is currently too large and heavy to be used in small UAS operations.”

    We want to change this paradigm and offer a small sensor so that the system integrators have a reason to develop the supporting architecture. This is already a priority for Tridge and co.

  • There's also the accuracy of measuring the servo movement for the gimbal.

  • What are the plans to integrate the LIDAR with gps and IMU?  Is the plan to use the gps connected to the pixhawk and the IMU from the pixhawk?  I suppose you could use any GPS, match up UTC time from the logs with your own higher spec GPS, but I wonder what the accuracy of the pixhawk IMU is?

  • @mP1, we want to get the price down as low as possible so I'm hoping that there will be enough interest to allow for high volume production. But without customer demand we can't afford to invest in tooling and stock.

    I can tell you that the laser modules have already started shipping to selected customers and that the next model to become available will be the gimbal mountable version that we are already able to manufacture in small quantities on request.

    This LIDAR module is designed specifically for small UAVs but has the performance to match high end equipment. The gimbal component weighs 90g and runs at 36,633 readings per second in collision detection mode or it can be switched into mapping mode (3cm resolution) at 1,145 readings per second. All this with a measuring range of 120m and a total power consumption of just over 1W.

    Life imitates art.

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    Images courtesy of MGM and Tracy.

  • Laser: How much will these be when they are available to the public ?

  • Thanks Adam. We're also going to do a gimbal mountable version for forward looking 3D LIDAR. The tested update rate is 36633 readings per second and we're providing both a serial output (for those with lots of spare processing power) and an analog alternative along with proximity alarms that are much easier to use for obstacle detection by lower performance flight controllers.

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  • I like what I see Laser Developer

  • Collision avoidance laser:

    36000 readings per second

    100m range

    coming soon...

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