about acquisition

From: viswanath (daita_at_eng.usf.edu)
Date: 07/01/04 

Date: 1 Jul 2004 14:32:16 -0700

Hi all,
I have few questions about signal acquisition. When we are acquiring
ie searching the code phase do we change the code states in increments
of one chip or half a chip? If it is half a chip how can one implement
that?
If increments are 1 chip then is it correct to say that it would take
atmost 1 s to acquire a signal given we know the frequency? I have
read that the acquisition is instead is performed in terms of 1/2
chip. How could I implement the acquisition of code in this case?
Also books refer to the advancement or retarding of clock. Does that
mean we are just generating the code early or late or instead changing
the frequency of the local code. I mean that does the code get
generated at 1.023 -/+ x Mhz? where x is the advance or retard clock?
or is it that we still generate the clock at 1.023 Mhz only but start
the generation of clock x Mhz before and x Mhz later than the instant
of time when the code should have started?
In many GPS block diagrams (like the Kaplan book code
acquisition/tracking)the control signal which is output of code nco is
given to control the generation of c/a code. Could someone explain
this in detail?
I would greatly appreciate any help and replies.
Looking forward to your replies,
Thanking You,
Viswanath

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