srinath mallikarjunan
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Twin coaxial counter rotating propellers

Started this discussion. Last reply by criro1999 Dec 9, 2013. 3 Replies

HiI would like to have 2 counter rotating propellers on a single drive shaft. Similar to a Kamov but of course powered by much smaller (possibly bldc motors)Does anyone have ideas on the mechanical…Continue

A 3G video call for video and telemetry

Started this discussion. Last reply by David Marra Aug 10, 2012. 6 Replies

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

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

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

 

srinath mallikarjunan's Page

Latest Activity

srinath mallikarjunan commented on jlcortex's blog post Searching for heavy duty applications for HYBRiX20
"Hi Jose Our flight controller can do some pretty amazing things. We have various custom maneuvers built in, obstacle avoidance etc.. Would you like to integrate (our FC and speed controllers) with your craft ?"
Aug 1, 2017
srinath mallikarjunan commented on Franz Bormann's blog post CREATOR, modular fixed wing flight system
"Do you have the Aerodynamic coefficients for this airframe ? What's the stall angle ?"
Apr 15, 2017
srinath mallikarjunan commented on Coptaire's blog post Propeller Shroud Project
"How did the results of the shroud test turnout in terms of efficiency and increased thrust ?"
Mar 26, 2016
srinath mallikarjunan commented on Chris Becker's blog post Formation Flying Mesh Network Demo
"Chris Since you are using point to multipoint, i guess you are setting the leader to broadcast mode, while the others are in unicast. Have i understood it right? Is the leader set to API mode? That way it can send a frame of data that specifies the…"
Aug 20, 2015
srinath mallikarjunan commented on Chris Becker's blog post Formation Flying Mesh Network Demo
"Hey Chris This work is super cool. Do you route all communication through the GCS? If not how do you create a Xbee mesh network? Or do you send and receive messages in a round-robbin fashion on all nodes?"
Aug 20, 2015
srinath mallikarjunan commented on David Dewey's blog post Flying 3D Spline Curves between Waypoints with ArduCopter 3.0
"This is the cubic spline reference i am following http://www.geos.ed.ac.uk/~yliu23/docs/lect_spline.pdf And code http://oceancolor.gsfc.nasa.gov/staff/norman/seawifs_image_cookbook/faux_shuttle/spline.c See how every segment, depends on every…"
May 18, 2015
srinath mallikarjunan commented on David Dewey's blog post Flying 3D Spline Curves between Waypoints with ArduCopter 3.0
"Hi David I am curious as to how you reduce processing overhead in spline computation. For example if there are 5 spline segments, segment-1 depends on segment-2, which depends on 3... and so on. If you had a mission made entirely of splines…"
May 18, 2015
srinath mallikarjunan replied to Steve's discussion MAVLINK to MATLAB?
"Hi Owen Is the Simulink-Mavlink interface ready? I am quite eager to try it"
Dec 9, 2013
criro1999 replied to srinath mallikarjunan's discussion Twin coaxial counter rotating propellers
"I do not have this config. I believe is easier and less expensive to have 2 motors (up/down) with separate props, instead of this config."
Dec 9, 2013
srinath mallikarjunan replied to srinath mallikarjunan's discussion Twin coaxial counter rotating propellers
"Thanks That is the configuration i am looking for.  Do you attach the motor furthest away from the prop with screws just like a regular bldc ? And do they come with varying motor ratings ?"
Dec 9, 2013
criro1999 replied to srinath mallikarjunan's discussion Twin coaxial counter rotating propellers
"I believe you are referring to this. I did think to make a quad x 2 with this, still in project phase. coax"
Dec 9, 2013
srinath mallikarjunan posted a discussion

Twin coaxial counter rotating propellers

HiI would like to have 2 counter rotating propellers on a single drive shaft. Similar to a Kamov but of course powered by much smaller (possibly bldc motors)Does anyone have ideas on the mechanical couplings between motor shaft and the propellers to make them spin at the same rpm but in opposite directions ?I don't need the whole swash plate mechanism.ThanksSee More
Dec 9, 2013
Ajit Krisshna commented on srinath mallikarjunan's blog post DCM versus Kalman filter
"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!"
May 20, 2013
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?"
May 20, 2013
Jeff Barton commented on srinath mallikarjunan's blog post DCM versus Kalman filter
"@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…"
May 20, 2013
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? "
May 19, 2013

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About Me:
Control theorist
Please tell us a bit about your UAV interest
Want to build an AHRS/Rate Table/Quad rotor

Srinath mallikarjunan's Blog

DCM versus Kalman filter

Posted on May 12, 2011 at 8:17am 10 Comments

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

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