[Ilugc] digital freedom in iitm?
- From: girishvenkatachalam@xxxxxxxxx (Girish Venkatachalam)
- Date: Mon May 12 05:23:43 2008
On 19:29:08 May 11, Sivasankar Chander wrote:
Certainly odd news. The GPS C/A receive signal is at 1575 MHz,
which can face interference from certain kinds of microwave ovens
and microwave devices. But my simple guess is that the tree cover
at IITM is causing too much attenuation of the signal from the
satellites at low elevations from the horizon. I've seen this behaviour
before from Garmin units - they need a clear line-of-sight to
the satellites for optimal performance.
The frequency sounds too low and that would cause all sorts of
propagation problems.
I believe there are various factors at play here.
Firstly as Sivachander suggested vegetation is a big problem. And for
certain frequencies, the moisture/rain/weather etc.
Secondly GPS satellites are not geostationary (Am I wrong?). So their
orbits may not be favorable at certain times.
IOW testing it during a hot summer day and collecting multiple samples
might help.
-Girish
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