Platform, tiedown motion 15may08



    project bd120 did a ten second vlbi cal scan using cband at 13:28:02 to 13:28:12 on 15may08 (UTC). After reducing the data they saw a 5 deg phase change in the 10 seconds. Could this phase jump have come from the platform motion? A 6 deg phase jump is 1 mm at 5 GHz.

How the platform height is controlled:

    The platform height is controlled using the 3 tiedowns and 6 distomats that measure the height of the platform every 2 minutes. The sequence is:
The plots show the platform, tiedown motion around the calibration scan (.ps) (.pdf):


processing: x101/081515/