by savuporo » Wed Jul 01, 2009 4:51 pm
by savuporo
Wed Jul 01, 2009 4:51 pm
PedroR wrote:I still like the idea of using a Compass to address this issue. What is the alternative approach here?
I dont have time for full explanation, but compass is notoriously sensitive to tilt, meaning any irregularities in levelness of ground will screw up compass reading big time ( i know, i have tried that )
Of course, compass coupled to gyro through a Kalmann filter can compensates for gyro drift, so compass in the system can improve absolute positioning over long term somewhat, but this is a complication to otherwise relatively simple navigation method.
In addition to compass, you can have inclinometers, various accelerometers, even 6-axis IMU and/or GPS attached, but none of the sensors alone provide 100% accurate navigation in all situations without checking external references.
Gyrodometry is simply a very good bang for relatively little buck in navigation accuracy.
PedroR wrote:I still like the idea of using a Compass to address this issue. What is the alternative approach here?
I dont have time for full explanation, but compass is notoriously sensitive to tilt, meaning any irregularities in levelness of ground will screw up compass reading big time ( i know, i have tried that )
Of course, compass coupled to gyro through a Kalmann filter can compensates for gyro drift, so compass in the system can improve absolute positioning over long term somewhat, but this is a complication to otherwise relatively simple navigation method.
In addition to compass, you can have inclinometers, various accelerometers, even 6-axis IMU and/or GPS attached, but none of the sensors alone provide 100% accurate navigation in all situations without checking external references.
Gyrodometry is simply a very good bang for relatively little buck in navigation accuracy.