[time-nuts] Homemade GPS Receiver
paulswedb at gmail.com
Fri Sep 26 09:56:57 EDT 2014
It is because of the processing gain and I believe these to be normal
Not an expert here but when the system de-spreads the signal the
information pops up above the noise since the noise is random and the
spread carrier only appears random.
On Fri, Sep 26, 2014 at 7:22 AM, Andrea Baldoni <erm1eaae7 at ermione.com>
> On Fri, Sep 26, 2014 at 10:07:56AM +0100, Dr. David Kirkby (Kirkby
> Microwave Ltd) wrote:
> > I don't understand the units of signal strength
> > "The L1 carrier is spread over a 2 MHz bandwidth and its strength at the
> > Earth's surface is -130 dBm. Thermal noise power in the same bandwidth is
> > -111 dBm"
> > Then goes on to talk about the signal being 20 dB below the noise.
> Hello David.
> It could be because there is a "process gain" associated in demodulating a
> spread spectrum signal.
> Best regards,
> Andrea Baldoni
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