[time-nuts] Low SNR GPS reception and cheap LNAs
attila at kinali.ch
Sat Apr 26 08:59:14 EDT 2014
On Sat, 26 Apr 2014 08:20:47 -0400
Bob Camp <lists at rtty.us> wrote:
> The ability of these receivers to handle noisy signals depends on a lot of
> things. The good stuff seems to have a massive number of correlators. Going
> from a 1.3 to a 0.3 db nf amp likely only helps you by 1 db. The low
> correlateor GPS’s are / were 10 to 20 db less sensitive than the newer stuff
Yes, the sub-optimal correlation system in GNSS-SDR seems to be one of
the problems. But still, the LNA will help with two things: It will
enable me to put the antenna in a better spot while compensating for
the cable loss (i need about 20m of additional cable, which is about 6dB
of loss) and a stronger signal at the bladeRF such that less gain is
needed in the radio chip there.
My current goal is to get a feeling how GNSS-SDR works. After i get
an understanding for the code, i will try to improve on the correlators
in order to improve reception.
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