Re: [Autopilot] HELPING :-)
Status: Alpha
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From: <ak...@ao...> - 2005-07-08 04:03:39
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can someone please remove my name from the mailing list, Thanks -----Original Message----- From: FlightSense <uav...@fl...> To: aut...@li... Sent: Fri, 8 Jul 2005 01:22:21 +0200 Subject: RE: [Autopilot] HELPING :-) <![endif]><![endif]> Hi Anthony, Yeah Flintstones, why not, would have given your arms some work instead of the feet :-) Sorry, sometimes I think (fly) as a Dutch when writing English, what came to my mind was a "Blimp"! Hope didn't spoil a reputation here! OK, you can use existing networks. Do the CDMA 1X broadband nets cover distant outback regions? The video link, if not used for control, could (technically) overcome BLOS with a Frame-Store-Unit. But this will create minutes of delay, and I'm afraid that this is too heavy for flight. So, back to #1,.......Why don't you put a decent DV Camcorder onboard? With kind regards, Coert -----Original Message----- From: aut...@li... [mailto:aut...@li...]On Behalf Of Anthony Ball Sent: Tuesday, 05 July, 2005 09:50 To: aut...@li... Subject: Re: [Autopilot] HELPING :-) Coert S. Langkemper With all due respect, the balloon idea seems to me a little bit like Flintstone's technology ( how would you stabilise the yaw axis for the direction mechanism? ) With this said, there is definitely some weight in your idea ( pun :) Land based repeaters on hill tops would be more feasible? Each new contracting area would require installing a new repeater. Soon a private network of 'hot spots' would allow LIVE DV video at 9 Mbs + ! For now a second UAV could fly over head to deal with local terrain issues. (Hills and Trees). I feel that satcomm's would be the most reliable data link for flight control and visual reference. A low bandwidth data stream is all that is required for this. Satcomm prices are more realistic these days and offer much better bandwidth. The main problem with satcomm's still is communications while 'in motion'. If we fly within digital cell phone range, GSM or GPRS, we even have CDMA 1X broadband in Australia, we could use these networks for the DV. I don't know if they are reliable enough for flight control ??? By the way, ANY current RF comm. port type modem data link can be upgraded to satcomm's or digital networks without changing any flight computer software. It is transparent via VPN and IP addressing. It is also able to be made VERY secure from hackers. Wouldn't want to loose the thing to a ??? hacker, 911 UAV style. I can't wait to see what you come up with for Enhanced Video Reconnaissance. Do you have any other ideas on video BLOS ? Regards Anthony Ball Balltech ----- Original Message ----- From: FlightSense To: aut...@li... Sent: Tuesday, July 05, 2005 7:17 AM Subject: RE: [Autopilot] HELPING :-) Hi Anthony Ball, Your approach is understandably targeted to get operational with the "flying business". Unless there is a better idea for the wheel, I would also circumvent any reinvention. Though I know the "flying business" is a good drive for a companies revenue, In my case I will focus on the design of useful utilities for this field. As you've seen, my background is more related to electronics. So, now you brought me so far thinking about your bottlenecks, maybe this brainwave mite help. Your DV link issue regarding BLOS could be solved using this: First, typically WiFi is prone not to perform well BLOS, so we have to work around. Your Ethernet DV stream over WiFi could be enhanced by using high power WiFi with multiple intermediate Balloon-Based-Nodes (at 500ft), which can easily link route sections of 40km. each. Which results in 20km LOS for node-A then initiate a node-B handover using self tracking Yagi Antenna's. This will create a type of Virtual long range network. To overcome BLOS disconnects you need a FIFO buffer to store data while the link is reconnecting. Well, the problem is not new for UAV operations, but is there COTS equipment for this? By the way, one of my research fields will be focusing on Enhanced Video Reconnaissance. This much I'll say, so keep a watch what to expect on www.flightsense.nl With kind regards, Coert S. Langkemper FlightSense Amsterdam, The Netherlands http://www.flightsense.nl |