Gender
Male
About
Location
Kirkland, WA
About Me:
I am an avionics engineer for a major aircraft manufacturer. I specialize in aircraft navigation and guidance.
Please tell us a bit about your UAV interest
I am working on my own tightly-coupled GPS/INS navigation system and a flight control computer/autopilot. Process is slow because free time is short.
Hometown:
Chattaroy, WA
Activity Feed
"@Georacer:
You are correct that as satellites come into and out of view the GPS position solution can "jump". The slow variation of a few meters is the result of normal noise in the measurements.
DGPS essentially corrects the ionospheric delay.…"
You are correct that as satellites come into and out of view the GPS position solution can "jump". The slow variation of a few meters is the result of normal noise in the measurements.
DGPS essentially corrects the ionospheric delay.…"
"Different altitude sources are best used for different things. For example, barometric altimetry (MSL) is great for keeping relative distance within an airmass, since everyone's sensors are affected by the local conditions by the same amount. For…"
"You do realize that GPS outputs geometric altitude, and not mean sea level (MSL) altitude, right? They use different coordinate systems, which accounts for some of the discrepancy. Also, barometric altitude is a function of many parameters,…"
"@Mathew
How does the inertial guidance system know the GPS is wrong? What if the GPS is working fine and the inertial is wrong? How can you tell the difference?
"A man with two watches doesn't know what time it is."
Augmenting the inertial with…"
How does the inertial guidance system know the GPS is wrong? What if the GPS is working fine and the inertial is wrong? How can you tell the difference?
"A man with two watches doesn't know what time it is."
Augmenting the inertial with…"
"Spoofing is difficult to do, but given a few years I am sure there will be some tools out there for those that want to be mischievous.
In order to work well the spoofer needs to know the location of the target. Then they need to introduce false…"
In order to work well the spoofer needs to know the location of the target. Then they need to introduce false…"
"Here's another place to look:
http://www.movable-type.co.uk/scripts/latlong.html"
http://www.movable-type.co.uk/scripts/latlong.html"
"I happen to work with commercial aircraft navigation systems. It is apparently common for aircraft flying around Seoul to have their GPSs drop out. Their mischievous neighbors to the north are suspected of playing games. So far it seems they are…"
"I find all the comments about "a lot of sky" and using probability to show the risk of collision as missing the two most important aspects that the poster brought up.
First, the idea that aircraft fly "random paths" through the sky is false. All…"
First, the idea that aircraft fly "random paths" through the sky is false. All…"
"bcrow,
The air above Montana is part of the US NAS. Below 700' AGL has special regulations, but it is still part of the NAS.
By the way, Kalispell is one of the most beautiful places in the world. The best airshow I ever saw was there.
Tom"
The air above Montana is part of the US NAS. Below 700' AGL has special regulations, but it is still part of the NAS.
By the way, Kalispell is one of the most beautiful places in the world. The best airshow I ever saw was there.
Tom"
"Hi Jan,
The arduino does not have enough processing power to run an inertial navigator in addition to the autopilot code. Try checking out Open Pilot.
Tom"
The arduino does not have enough processing power to run an inertial navigator in addition to the autopilot code. Try checking out Open Pilot.
Tom"
"IMU's do not output position. An IMU outputs angular rates and lateral accelerations. You need software to turn that information into something useful, such as orientation, position, and velocity. An AHRS uses an IMU to output orientation. If you…"
"Nice Caleb!
I have a few questions I am hoping you can answer:
Did you use the same accels and gyros from your IMU board?
Why the two processors? Is one running the GPS/IMU code and the other autopilot code?
Cost? Are you going to be selling any?…"
I have a few questions I am hoping you can answer:
Did you use the same accels and gyros from your IMU board?
Why the two processors? Is one running the GPS/IMU code and the other autopilot code?
Cost? Are you going to be selling any?…"
"So how is what you are making an INS? It sounds like you are making an AHRS (attitude heading reference system).
An INS computes position and velocity using the inertial sensors. An AHRS provides attitude only, which is what this sounds like.
…"
An INS computes position and velocity using the inertial sensors. An AHRS provides attitude only, which is what this sounds like.
…"
"Great stuff Caleb! Thanks for sharing."
"Your brocure does not mention any force or moment measuring capability. Can you?
I get the impression that you are not interested in publishing your rates. Why? Can I ask if your rates are less than $300 an hour?"
I get the impression that you are not interested in publishing your rates. Why? Can I ask if your rates are less than $300 an hour?"
