Gps L3 in a2010 data 27sep10
on 27sep10 (22:30ast) 2010
complained that gps l3 was on for an extended period of time:
the images show the dynamic spectra for files
dynamic spectra file .0031 start
22:36:38 ast (.gif)
dynamic spectra file .0032 start
22:46:44 ast (.gif)
dynamic spectra file .0033
start 22:56:51 ast (.gif)
The next plot shows the position
(relative to Arecibo's source az,za) of the gps constellation during
- the vertical scale has a one second resolution.
- Each image lasts for 10 minutes
- Gps l3 was on for about 26 minutes.
the final plots shows the angular
distance between svn15 and the pointing direction of the telescope (.ps)
- The horizontal axis is arecibo azimuth, the vertical scale is
- The plots show the positions of each satellite.
- The satellites are labeled with the data yymmdd and time hhmmss
(ast) of their lowest za.
- the az position is the direction of the satellite similar to the
source azimuth of arecibo. The arecibo feed is always 180 degrees from
- svn 26 comes the lowest in za, but svn15 comes the closest to the
current pointing direction.
- The telescope was sitting at az=59.7, za=4.88 looking in the
- svn15 was about 10.8 degrees from the pointing direction when the
rfi started and 10.5 degrees away when it stopped.
- svn25 (the new satellite) was close to the horizon when the rfi
was on. I don't know whether is could have been scattering into the
beam from the platform.