[time-nuts] Homemade GPS Receiver
erm1eaae7 at ermione.com
Fri Sep 26 07:22:56 EDT 2014
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.
It could be because there is a "process gain" associated in demodulating a
spread spectrum signal.
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