On 8/1/17 11:11 AM, Didier Juges wrote:
"The newer the receiver, the more horsepower in the silicon. In the case of
GPS, that
gives you more correlators to do DSP. The sensitivity improvement is a
direct result
of that. If you take a look at the guts of a TBolt, they date to the late
1990’s. That’s
a long time in silicon years …."
It seems that more correlators would speed up the time to first fix, not
necessarily the sensitivity, particularly I do not see how it would
directly affect the capability to stay locked when signal strength
fluctuates?
On the other hand, more correlators may help when there is multipath and a
whole bunch of extraneous signals are fed into the receiver, so maybe the
apparent lack of sensitivity is really the inability to see the signal from
the chaff, not necessarily sensitivity in terms of noise figure.
There's also "more sophisticated correlators" and "more sophisticated
tracking loops" that are enabled by more computational horsepower. The
days of "independent" PN tracking loops for each signal are probably
long gone, and there's clever "aiding" of the loops by estimating the
on-the-fly variations.
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