Now a solution to bring that intrusive drone down

Drone newsletterDones are increasing in numbers every day. While this is good news for the drone industry, it causes significant concerns to several agencies that need to protect their resources. Locations like prisons, for instance, require their airspaces to be free of drones to prevent any sort of malpractice.

Authorities around the world have tried different measures for this. The Dutch police, for instance, has trained eagles to tackle intrusive drones. Other measures include shooting a net to capture the drone, or even the conventional firearms to shoot the drone down.

However, none of these measures are perfect. Using eagles is not agreeable to animal rights activists, nets are not viable in the long distance and firearms come with their own challenges.

Now, a Taiwanese startup has come up with a solution that can bring a drone down or send it back to its spot of origin. DronesVision’s HiGH + MiGHTY SKYNET looks like an oversized rifle with a viewfinder and a trigger to activate it. It is light at 5.7kg and works on lithium ion battery that has to be carried separately in a backpack.

How does it work?
Consumer drones mainly use two bands in while in operation. One is the GPS/GLONASS for satellite position at 1.45-1.65GHz and the other is the remote control uplink and video transmission downlink, both of which use 2.4 GHz band.

“Our product HiGH + MiGHTY SKYNET anti-drone system is designed to jam/block these two bands when drones are flying into unauthorized areas,” said Kason Shih, Founder and CEO of DronesVision. “HiGH + MiGHTY SKYNET can block GPS navigation positioning, force rogue drones fly back to original take-off points, or to land onto the ground where they hovered.”

The solution can work in three modes. In the first mode, it can cut off the global positioning system alone, causing the drone to drift in the air, making it harder to control. Usually, when this happens, the owner gets nervous and stops flying around. In the second mode it can jam the remote transmission link, cutting off the video connectivity, and it will send the drone back to its owner, allowing authorities to track down the culprit. In the third mode, the solution can force the drone to land on the spot where it hovered and got jammed, enabling authorities to access the footages it has recorded.

The target market

SKYNET can be useful in a range of situations, but currently, the company is targeting government, critical infrastructure and other large-scale deployments. It sells mainly to systems integrators and arms dealers.

“At the moment, our target customers are government-related units such as military, police and law enforcement, fire department, power plants, prisons, airports,” Shih said. “In the near future, it might be deployed to protect stadiums or sports events, amusement parks, national parks.


The drone market is expected to witness significant growth in the coming years. According to a report from MarketsandMarkets, the global UAV market for commercial application is expected to reach US$5.59 billion by 2020, growing at a CAGR of 32.22 percent between 2015 and 2020.

With such growth, the concerns associated with it could also increase, and hence there could be a strong market for a solution like SKYNET in the coming years. DronesVision is looking to capitalize on this and is currently working on a second solution called Dronedar that would integrate a radar-based drone detection system with the anti-drone facility.

This article originally appeared on August 23, 2016 on, written by Prasanth Aby Thomas.


What are the differences between the 1080p version and the 720p version of the same media?

Differences in video probably won’t be noticeable for untrained eye. 1080p video would have to be downscaled anyway.

Let’s assume the original video was 1080p. In this case the 720p video was first scaled, then compressed. On the other hand, 1080p clip was first compressed server-side, then scaled on your machine. 1080p file will obviously be bigger. (otherwise it would offer higher resolution, but at lower quality, ruining the visual experience and invalidating the point of using higher resolution1)

Lossy compression usually causes visual artifacts that appear as square blocks with noticeable edges when video is paused, but aren’t visible when you play it with normal framerate. 1080p file will contain more square blocks (caused by compression) than 720p video, but those blocks will be of approximately the same size in both videos.

Doing simple math we can calculate that 1080p video will contain 2,25 times more such blocks, so after scaling it down to 720p those blocks will be 2.25 times smaller than in actual 720p video. The smaller those blocks are, the better quality of the final video is, so 1080p video will look better than 720p video, even on 720p screen. Resized 1080p video will appear slightly sharper than actual 720 clip.

Things get a bit more complicated if source material was bigger than 1080p. The 1080p clip is first scaled to 1080p and compressed before you play it and then scaled once again while playing. The 720p clip is scaled only once and then compressed. The intermediate scaling step which is present in 1080p video case will make its quality slightly worse. The compression will make 720p even worse, though, so 1080p wins anyway.


It’s not only video that is compressed, but audio too. When people decide to use higher bitrate for video compression, they often do the same with audio. 1080p version of the same video may offer better sound quality than 720p video.

Do you have questions about video and recording? Ask the Doctor! We will answer all your questions on our blog. Submit your questions today…

AirKnight HD Video Formats

The AirKnight HD is the key to HD-SDI Solid State Airborne system.

AirKnightbase ShopRecord Audio and Video in full high definition, 3G-SDI at 1080p60/30 with the Datatoys AirKnight HD single channel solid state airborne video recorder. Full 1080p60/30 HD 3G-SDI solid state airborne video recorder designed for professional aircraft operations. Record 3G-SDI, HD-SDI, HDMI or CVBS (NTSC & PAL) video input streams to USB 2.0 or USB 3.0 flash media, USB External storage such as SSD or HDD, or SD solid state media.

Available Video Formats:

  • Composite PAL, NTSC
  • HD-SDI 720p30, p50, p60
  • HD-SDI 1080p25, p29.97, p30, i50, i59.94, i60
  • 3G-SDI 1080p50, p60, p59.94
  • HDMI 640x480p60
  • HDMI 480p30, i60
  • HDMI 576i50
  • HDMI 720p50, p60
  • HDMI 1080i50, i59.94, i60
  • HDMI 1080p25, p30, p50, p60
  • HDMI 800X600p60, p75, p85
  • HDMI 1152x864p60
  • HDMI 1280x768p60, p75, p85
  • HDMI 1280x960p30, p60
  • HDMI 1280x1024p30, p60, p75
  • HDMI 1360x768p60
  • HDMI 1400x1050p60
  • HDMI 1440x900p60
  • HDMI 1600x1200p60
  • HDMI 1680x1050p60
  • HDMI 1920x1200p50, p60
  • HDMI 2048x2048p30

Learn more about the AirKnight HD. Contact us today for a quote!

HD-SDI Cabling and Loss

HD-SDI is regularly transmitted over low-loss digital video grade RG6-style coaxial cable up to a nominal maximum distance of about 100 meters. However, when a lesser diameter cable like the RG179 is used, higher loss is encountered. This is primarily because of the size (cross-section) of the center conductor. Electrical signals travel through a wire by an effect known as the ’skin effect’ and the lesser the area available, the more the attenuation. Using RG179 for transmitting HD-SDI signals is good to about 100 feet. Another important factor is to use cable sweep tested for the highest possible frequency -bandwidth. Although the Mil-SPEC RG179 cable has a very strong outer jacket, the RG179 MIL-C-17/94F is rated to carry a maximum of 3GHz, with “attenuation rated at 21dB per 100 feet, maximum, at 0.4 GHz”. In comparison the Belden RG179DT (Digital Truck) cable carries signals to 4.5GHz. The ultimate distance limitation occurs for any digital signal when the perceived signal jitter component seen by the receiver impairs its ability to recognize and reconstruct bit transitions.

The range of operation for an HD-SDI receiver is specified in SMPTE 292M to at least -20 dB at one-half the data clock rate, or about 743 MHz. Therefore, a standard level 0.800 volt peak-to-peak digital transmission may be attenuated to as low as 0.080 volt, or 80 millivolts, while performing reliably. A very high-grade receiver may recover the HD-SDI signal at a level as low as -30 dB, or 70 mV.

To perform a cable loss calculation, the designer should look for the attenuation in dB at 743 MHz, or a frequency very close to that value, on the cable specification loss chart. Cable loss is based on a 100 foot length or a 100 meter length depending on the chart column used. Divide the cable run distance by 100 and then multiply by the dB value to attain the total attenuation in dB for that run. Refer to manufacturer tables. The SMPTE recommends the designer factor in about 10% less cable than the calculated run length so as to build in a safety margin for reliable operation.

Coax is not the only medium available. Serial digital video may be routed through fiber optic cable for essentially unlimited distances depending on the system configuration. A convertor is used to convert the electrical signals to light signal, and then sent along the fiber optic cable whereas the other end would have the decoder to convert the light signals back to electrical signals. If your application requires long runs of cable, do not hesitate to contact us for suggestions and solutions.