The invention relates to a method for acquiring a receiver (1) into a
code modulated spread spectrum signal received by the receiver (1). In the
method at least one replica code (r) is used which corresponds to a code used with
the modulation having a pre-determined number of chips, and an examination phase
is performed, in which a frequency shift of the signal within a selected frequency
area is examined, and a code phase of the code used with the modulation is examined.
In the method the frequency shift examination is divided into a first estimation
phase and a second estimation phase, wherein in the first estimation phase the
selected frequency area is divided into a first set of frequencies, and in the
second estimation phase a second set of frequencies is examined nearby each frequency
of the first set of frequencies. Further, a comparison for frequencies of the second
set of frequencies is performed using the received signal and the replica code
(r), and the results of the comparison are used to estimate the correct frequency shift.
