Gender
Male
About
About Me:
I am the designer of a UAV controller with GPS, 3 gyros, and 3 axis accelerometer, being sold by Spark Fun Electronics.
Hometown:
Schenectady, New York
Activity Feed
"Mark,
I am planning on getting back into multirotors and have a couple of questions for you.
I lost your email address. Could you please contact me at my new email address, wjpremerlani@gmail.com
Bill"
I am planning on getting back into multirotors and have a couple of questions for you.
I lost your email address. Could you please contact me at my new email address, wjpremerlani@gmail.com
Bill"
"Mark,
Thank you so much for your time and effort in testing this concept in multicopters. It performed better than I expected. It is my conjecture that the combination of your expert piloting skills and the performance of the feedback controls (I…"
Thank you so much for your time and effort in testing this concept in multicopters. It performed better than I expected. It is my conjecture that the combination of your expert piloting skills and the performance of the feedback controls (I…"
"Johnson,
There are several methods for using a magnetometer for gyro drift compensation. Here is the method that I like to use:
1. Transform the 3D measured magnetic field vector from body frame to earth frame.
2. Take the cross product of the…"
There are several methods for using a magnetometer for gyro drift compensation. Here is the method that I like to use:
1. Transform the 3D measured magnetic field vector from body frame to earth frame.
2. Take the cross product of the…"
"Johnson,
Thanks for your questions.
Regarding renormalization introducing drift, in practice, it does not create much drift. I have done static (motionless) tests on the UDB5 hardware with drift correction turned off and measured the residual drift…"
Thanks for your questions.
Regarding renormalization introducing drift, in practice, it does not create much drift. I have done static (motionless) tests on the UDB5 hardware with drift correction turned off and measured the residual drift…"
"Hi Phil,
Just to make sure we are "on the same page", the document that I sent you addresses the issue of axis misalignment between magnetometer and accelerometer/gyro (IMU) sensors that you can run into when the magnetometer is mounted physically…"
Just to make sure we are "on the same page", the document that I sent you addresses the issue of axis misalignment between magnetometer and accelerometer/gyro (IMU) sensors that you can run into when the magnetometer is mounted physically…"
"MagnetometerRealignment.pdf
Phillip,
I just noticed that last April you asked for the above document.
Best regards,
Bill"
Phillip,
I just noticed that last April you asked for the above document.
Best regards,
Bill"
"Kees,
I think that MatrixPilot LOGO has unlimited range, but it has never been tested beyond 32 kilometers.
However, it should be easy enough to test the LOGO range using HILSIM, so if anyone is interested in using LOGO for long range missions, let…"
I think that MatrixPilot LOGO has unlimited range, but it has never been tested beyond 32 kilometers.
However, it should be easy enough to test the LOGO range using HILSIM, so if anyone is interested in using LOGO for long range missions, let…"
"Hi Pete,
You are correct, I increased the navigation range of MatrixPilot some time ago at Florin's request. It now uses 32 bit integer arithmetic with 1 meter resolution for navigation, so waypoints can be anywhere on the globe and any altitude.…"
You are correct, I increased the navigation range of MatrixPilot some time ago at Florin's request. It now uses 32 bit integer arithmetic with 1 meter resolution for navigation, so waypoints can be anywhere on the globe and any altitude.…"
"Joe,
The topic of skidding of multicopters and aerodynamic forces on them has come up from time to time on this forum. I cannot find them off hand, you might want to look around for them. Here are a few conclusions:
1. When a multicopter is tilted…"
The topic of skidding of multicopters and aerodynamic forces on them has come up from time to time on this forum. I cannot find them off hand, you might want to look around for them. Here are a few conclusions:
1. When a multicopter is tilted…"
"Hi Morli,
Thanks. I suggest you also take a look at Peter Hollands' post on this subject.
Best regards,
Bill"
Thanks. I suggest you also take a look at Peter Hollands' post on this subject.
Best regards,
Bill"
"Peter,
A couple aspects of your flight are worth commenting on.
During the 180 degree roll over on a straight flight segment, there was some loss of altitude. There is not much we can do about that with an EasyStar, it does not generate much lift…"
A couple aspects of your flight are worth commenting on.
During the 180 degree roll over on a straight flight segment, there was some loss of altitude. There is not much we can do about that with an EasyStar, it does not generate much lift…"
"Peter,
Thanks for posting this. It has been fun working with you and the rest of the MatrixPilot developers.
Best regards,
Bill"
Thanks for posting this. It has been fun working with you and the rest of the MatrixPilot developers.
Best regards,
Bill"
"Mark,
The math for the method described in this discussion was developed for fixed wing, I doubt that it will work very well for multicopters. It assumes that there is a centrifugal acceleration equal to the cross product of the rotation rate vector…"
The math for the method described in this discussion was developed for fixed wing, I doubt that it will work very well for multicopters. It assumes that there is a centrifugal acceleration equal to the cross product of the rotation rate vector…"
"Hi Mark,
This feature is already partially implemented in the MatrixPilot_wjp_HelicalTurns branch and the helical turns tag. If you define CENTRIFUGAL_WITHOUT_GPS to be one, centrifugal compensation will be computed without GPS or airspeed sensors,…"
This feature is already partially implemented in the MatrixPilot_wjp_HelicalTurns branch and the helical turns tag. If you define CENTRIFUGAL_WITHOUT_GPS to be one, centrifugal compensation will be computed without GPS or airspeed sensors,…"
First of all, thanks to Peter Hollands, who produced the above picture of a helical flight trajectory from one of his HILSIM test flights of the latest version of fixed wing flight controls for the open source MatrixPilot project, also known as the…
"Hi Matt,
Nice work. Congratulations.
I am not surprised that you decided to design the system that you wanted.
How large of a market do you think there is for your design? Are you going to produce and sell them? Perhaps approach someone else to…"
Nice work. Congratulations.
I am not surprised that you decided to design the system that you wanted.
How large of a market do you think there is for your design? Are you going to produce and sell them? Perhaps approach someone else to…"
