I'm working on Android navigation app which uses complex of sensors to determine position changes. In some cases device cannot achieve GPS signal for a while (tunnel or multilevel parking) and I want to compensate these gaps using INS approach. Yes I know that there're another approaches like cell-id or data got from device's carrier, but currently I'm focused on sensors.
Well, INS approach can be divided into two big tasks: 1. attitude determination (gyro or accelerometer + magnetometer or some combination) 2. velocity and distance calculation. Here I double integrate linear accelerometer values. Now I try to resolve the second task. I prepared all calculation and made contrastive analysis of data got from linear accelerometer on different Android devices: Sensation, Motorola Xoom and Nexus S. I put all devices on a platform and moved the platform on 8 meeters with an acceleration on Y axis. After that I built graphics and they really confused me - all 3 graphics has the same amplitude but peak values are different. For example at the same moment I have 0.2 m/s^2 on Xoom and 1.2 m/s^2 on Sensation. Hence after calculation I had a big difference in distance. Official documentation doesn't explain it. I surfed the web but didn't find any answer about that issue. So my question is: did someone faced to it? Or maybe you know an advice which will help me to solve it? In addition, android Sensor class has few parameters. I found that Sensation and Xoom has different RESOLUITON values - Sensor.getResolution(). Sensation - 1.0 Xoom - 0.009576807 I'm stack with it, so any help will be really good! Thanks in advance. -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
