"Your paper looks very interesting. I will give it a thorough read and see if I can wrap my head around some of the underlying concepts. Thanks!"
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Telemetry over cellular …
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srinath mallikarjunan's Discussions
A 3G video call for video and telemetry
Started this discussion. Last reply by David Marra Aug 10, 2012. 6 Replies 0 Likes
Can i send and receive video and telemetry using a modified 3G video call? It should be possible. Any thoughts?Continue
HUD does not stabilize
Started this discussion. Last reply by srinath mallikarjunan Jul 13, 2012. 2 Replies 0 Likes
HiI am using Arducopter-2 with APM-1When i went for a test flight, everything seemed ok at startup, but after i powered the motors, the angles/gyro rates/mag started giving erratic readings even when…Continue
Sending data on a cellular network without connecting to the internet
Started this discussion. Last reply by Jake Stew Jul 15, 2012. 14 Replies 0 Likes
I have been trying to send and receive data using a 2G cell phone network. I wish to communicate the bare minimum needed for telemetry and send waypoints to the uav. I hope that when i graduate to…Continue
Sending telemetry using the drone cell
Started this discussion. Last reply by Michael Pursifull Jun 28, 2012. 3 Replies 0 Likes
Hi everyoneI was wondering if it would be possible to replace the xbee with a drone-cell to send telemetry?Could it even replace the 2.4GHz radio?Obviously just texting messages is not a solution.If…Continue
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Ajit Krisshna commented on srinath mallikarjunan's blog post DCM versus Kalman filter"Thanks for the reply Jeff!
That makes a lot of sense. So the part where we decide "how much" of the accelerometer we want and how much of the gyro reading we want is also decided by the PI gain values?"
"@Ajit
Essentially, the integrated gyro measurements provide the "high frequency" content of the pitch & roll estimates, while an acceleromter-based gravity vector estimate provides the "low frequency" content. The…"
Ajit Krisshna commented on srinath mallikarjunan's blog post DCM versus Kalman filter"How does DCM do a basic complementary filter? I am not able to understand which block of the DCM does this. Could someone throw light on this? "
srinath mallikarjunan commented on Armin Strobel's blog post UAV swarm"How do they avoid the obstacles? Do they keep recomputing trajectories as they fly?"
Thomas Mc Grory replied to srinath mallikarjunan's discussion esc calibration and motor issues"Hi Chris,
I am haveing trouble calibrating my ESC's, constant beeping. I purchased the 3DR Hexa ready to fly two months ago, still cannot get them to turn.I have tried every stage of the troubleshooting and no luck. Any…"
kadmow replied to srinath mallikarjunan's discussion Angle of attack and sideslip sensor"AOA is not affected by the aircraft attitude... (I may get flamed for that).... Remember that the aerofoil performance is usually defined in terms of C_L and C_D versus AOA.. not airspeed or attitude
AOA (alpha) is the angle of the wind with…"
David Marra replied to srinath mallikarjunan's discussion A 3G video call for video and telemetry"Agreed. Been thinking a lot about it lately.
What sort of configuration are you working on?"
srinath mallikarjunan commented on Andreas M. Antonopoulos's group Telemetry over cellular IP"Tommy, It's a great idea.Could you beam back both the video and telemetry using the 3g USB stick?"
srinath mallikarjunan commented on Andreas M. Antonopoulos's group Telemetry over cellular IP"Has anyone tried to transfer a file using a direct modem to modem call? How low is the bandwidth? If the bandwidth is so low, i wonder how 3G video-calls take place."
srinath mallikarjunan commented on Andreas M. Antonopoulos's group Telemetry over cellular IP"Hi Alan
If we just went by the difference in uplink and downlink frequency a 3G video call wouldn't be possible. Clearly the cell-phone tower does some stuff in between.(I guess compresses data and changes the frequency)"
srinath mallikarjunan commented on Andreas M. Antonopoulos's group Telemetry over cellular IP"Let's assume the laptops were in 2 different cities. So you couldn't use a wireless lan/wifi.
A conventional modem would enable point to point data transfer. Can a 3G modem also do this. In which case you should be able to transfer a file…"
srinath mallikarjunan commented on Andreas M. Antonopoulos's group Telemetry over cellular IP"Suppose you have 2 usb 3G modems, connected to 2 laptops. Can you exchange files/video between the 2 laptops without involving the internet.
I know a 3G video call is possible between 2 phones, so i guess it should be possible to stream video from 1…"
Jake Stew replied to srinath mallikarjunan's discussion Sending data on a cellular network without connecting to the internet"Unfortunately all cell phone tower antennas are directional panel/sectional type antennas and are pointed downwards.
YMMV because of this. It's certainly not the best solution it seems at first glance."
Jonathan T. Watters replied to srinath mallikarjunan's discussion A 3G video call for video and telemetry"Even if you use TCP/IP the data is still going to pass through the internet.
Its going to go like this Drone <-> Cell Tower closest to drone <-> Cell Company Server (Internet) <-> Cell Tower closest to ground station
So…"
David replied to srinath mallikarjunan's discussion Sending data on a cellular network without connecting to the internet"I certainly don't disagree that the regulation is outdated, more than a little bit unenforceable, and in need of overhaul, but it is still on the books as both of your links mention. What folks do with information is a personal decision,…"
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Srinath mallikarjunan's Blog
DCM versus Kalman filter
Posted on May 12, 2011 at 8:17am 10 Comments 1 Like
Hi
I notice that attitude estimation is done using the DCM algorithm.
I was wondering if anyone, has tried implementing a Kalman filter for attitude estimation?
The DCM update has a nice intutive feel to it, but i would like to throw in a sound math proof for why it converges. Has anyone worked on this so far?
Regds
Srinath
I notice that attitude estimation is done using the DCM algorithm.
I was wondering if anyone, has tried implementing a Kalman filter for attitude estimation?
The DCM update has a nice intutive feel to it, but i would like to throw in a sound math proof for why it converges. Has anyone worked on this so far?
Regds
Srinath
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