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View Code? Open in Web Editor NEWAn iPhone-friendly Kalman filter written in C.
Home Page: http://github.com/lacker/ikalman
License: MIT License
ikalman's Introduction
See gps.h for usage. --------- Check LICENSE for licensing info.
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nan
Hi,
I'm trying to implement this in my custom location manger on iOS but get_lat_long get_bearing and get_mph all just return nan.
I'm creating the filter like this:
self.kalmanFilter = alloc_filter_velocity2d(self.noise); //Noise is 1.0f
Updating it like this:
update_velocity2d(self.kalmanFilter, location.coordinate.latitude, location.coordinate.longitude, timeIntervalSinceUpdate); //Where timeIntervalSinceUpdate is an NSTimeInterval since the last CLLocation
And reading it like this:
CLLocationDegrees lat, lon;
get_lat_long(self.kalmanFilter, &lat, &lon);
CLLocationDirection bearing = get_bearing(self.kalmanFilter);
CLLocationSpeed speed = get_mph(self.kalmanFilter) * 0.44704f; //Convert mph to meters per second
NSLog(@"%.1f %.1f %1.f %1.f", lat, lon, speed, bearing);
All i get is "nan nan nan nan"
Is this for the realization of single target tracking?
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