Attending: Julian, Brian, Kris, Shaul, Qi, Karl, …
Agenda:
Notes:
Attending: Brian, Jeff, Julian, Kris, Shaul, Qi
Scanning rates
Brian will look into scanning speeds, possible limits etc. (AI)
With reaction wheels, there is not much coupling between precession and spin; If increase spin, precession may be slower.
WMAP used reaction wheels
Scan angles (Kris)
mitigation of polarization systematics
alpha: angle between boresight and spin axis; beta: angle between sun-satellite and spin axis (swapped definitions)
Plots are one-year average on single pixel; at least 4 hits per pixel
Large precession angle helps mix pixels
Kris is going to calculate at different spin and precession rates. (AI)
Cross Dragone (Qi)
Requirements: no direct view of sky, no significant sidelobes, and can fit into the envelope
With a third flat mirror, two designs below do not have direct view of sky and can fit into the envelope
D=140 cm, F#=3.0, FOV=+/- 5 deg
D=120 cm, F#3.5, FOV=+/-7 deg
Sidelobes still exist.