Android accelerometer accuracy (Inertial navigation)
2011年10月20日 · I was looking into implementing an Inertial Navigation System for an Android phone, which I realise is hard given the accelerometer accuracy, and constant fluctuation of readings. To start with, I set the phone on a flat surface and sampled 1000 accelerometer readings in the X and Y directions (parallel to the table, so no gravity acting in ...
Calculating displacement using Accelerometer and Gyroscope …
2015年4月20日 · It is late but maybe useful. You can search on INS stands on inertial navigation system to find the details. However in brief: the IMU measures the accelerations and angular velocities in a frame attached to it. For example acc in x direction is the x direction of IMU, not x direction of reference frame which you want to calculate the positions in.
android - Indoor Positioning System based on Gyroscope and ...
2011年9月21日 · 1. To track indoor position starting from some reference point, only gyro and accelerometer is not enough. With accelerometer you can calculate speed, with gyro you can get direction of the mobile device, but to calculate indoor position you also need to have direction of movement, so for this case you need to use magnetic sensor.
Determining heading in Inertial Navigation Systems
2013年10月30日 · The most basic question when developing an inertial system is how to determine the direction of the carrier's movement. Even if we assume that the magnetometer readings are 100% accurate (which they are obviously not!) There is still the question of the device orientation relative to the user. Simple example - if the user is walking north, but ...
Getting co-ordinates using accelerometer and gyroscope readings
2014年3月4日 · But I dont know how to continue. So what I need is an "Inertial Navigation system" which takes acceleration and angular velocity vectors as well as the current position as input and returns the new position. I know this will have errors, but I am not concerned about that for now. If someone can guide me in this that would be great.
What is the structure of an indirect (error-state) Kalman filter and ...
2015年1月9日 · I have been trying to implement a navigation system for a robot that uses an Inertial Measurement Unit (IMU) and camera observations of known landmarks in order to localise itself in its environment. I have chosen the indirect-feedback Kalman Filter (a.k.a. Error-State Kalman Filter, ESKF) to do this. I have also had some success with an ...
xcode - iPhone CoreLocation accuracy - Stack Overflow
2011年9月1日 · 3. You won't get accuracy that good. The best you can expect is to within about 10m (30') of the correct location when you have a good GPS signal (clear view of the sky) and the signal is poor when indoors. The GPS accuracy spec is actually 100m but you usually can get 10m in practice if you can see many satellites (4-12).
time - How accurate is the GPS Clock? - Stack Overflow
2016年9月14日 · 28. According to this reference, the time should be accurate to within 40 ns, which is much less than the time it would take to transmit that information to another system. The reference also explains how GPS time might differ from UTC because of leap seconds that have been added since the deployment of GPS.
iphone - How can i handle distance through accelerometer
2013年2月13日 · 0. You can figure this out, but it won't be that accurate, mainly due to sample rate and the inaccuracy of the accelerometer. First figure out direction and force of the movement. If the user moves the iphone at +0.1G along the X axis and 0G along the Y and Z axis, then our force is +0.1G on the X axis. 1G is 9.8m/s, so the phone has move 0.9m ...
Accelerometer & gyro accuracy in different mobile device
2012年4月19日 · The first step is to decide which platform is the best one to implement such a system. The main possibilities are Samsung's Galaxy/ Galaxy tab, or the iphone/ ipad. The most important criteria is the accuracy of the sensors data. However, This comparison is very complicated, as the accuracy is dependent not only on the device itself but also on ...