motion
public static double[] motion(double duration,
double seeing,
double diameter,
double wind,
double expose,
double freq)
Returns the image motion of a certain seeing. Uses fft to generate a
randomized movement using a power spectrum as described in Madec, Conan &
Rousset, 1992, in an ESO proceeding. See also Martin PASP 99, 1360
(1987).
- Parameters:
duration - The duration of the observation in seconds
seeing - The seeing in arcseconds.
diameter - Telescope diameter in meters.
wind - Windspeed in m/s, 10 is a good average.
expose - Exposure time of motion-measuring system or zero for
instantaneous measurements.
freq - Maximum frequency of motion-measuring system, maximum
FMAX. High values increase array size returned.
- Returns:
- An array of image motion (arcsec), time steps are 1/2freq.