Courts and intelligent commentators on both sides acknowledge that there are two interests, both of which have value, at play in abortion law: the moral peril of destroying something that is, at the very least, in the process of turning into a human life, and a woman's right to control her own body.
Requiring women to view an ultrasound is a comparatively small imposition. Granted, it leads to minor delays and could cause her to have an increased sense of the weight of her choice. But this is not a decision that should be taken lightly or made quickly. If the law is administered in a manner that respects the woman's ultimate right to choose abortion, it's acceptable.
Incidentally, I believe similar laws have been upheld in other states, so this probably doesn't violate federal law unless it works differently. It may, of course, violate state constitutional law.