Method in a receiver and a receiver

A location system comprising at least

• a receiver (1) having means (24, 25) for receiving code modulated spread spectrum signal,
• means (6) for acquiring the receiver (1) into the received signal,
• means (18) for using at least one replica code (r) which corresponds to a code used with the modulation, which code having a predetermined number of chips, and
• examination means (4, 6, 36) for examining a frequency shift of the signal within a selected frequency area, and a code phase of the code used with the modulation, characterized in that the examination of the frequency shift is divided into a first estimation phase and a second estimation phase, wherein the location system further comprises
• means (4, 18, 36) for dividing the selected frequency area into a first set of frequencies for the first estimation phase,
• means (11) for examining a second set of frequencies nearby each frequency of the first set of frequencies in the second estimation phase, and
• means (16) for performing a comparison for frequencies of the second set of frequencies by using the received signal and the replica code (r),
• and that the examination means comprise means (21, 22) for evaluating the correct frequency shift by using the results of the comparison.

A receiver (1) comprising at least

• means (24, 25) for receiving code modulated spread spectrum signal,
• means (6) for acquiring the receiver (1) into the received signal,
• means (18) for using at least one replica code (r) which corresponds to a code used with the modulation, which code having a predetermined number of chips, and
• examination means (4, 6, 36) for examining a frequency shift of the signal within a selected frequency area, and a code phase of the code used with the modulation,
• characterized in that the examination of the frequency shift is divided into a first estimation phase and a second estimation phase, wherein the receiver (1) further comprises
• means (4, 18, 36) for dividing the selected frequency area into a first set of frequencies for the first estimation phase,
• means (11) for examining a second set of frequencies nearby each frequency of the first set of frequencies in the second estimation phase, and
• means (16) for performing a comparison for frequencies of the second set of frequencies by using the received signal and the replica code (r),
• and that the examination means comprise means (21, 22) for evaluating the correct frequency shift by using the results of the comparison.

An electronic device (23) comprising at least

• a receiver (1) having means (24, 25) for receiving code modulated spread spectrum signal,
• means (6) for acquiring the receiver (1) into the received signal,
• means (18) for using at least one replica code (r) which corresponds to a code used with the modulation, which code having a predetermined number of chips, and
• examination means (4, 6, 36) for examining a frequency shift of the signal within a selected frequency area, and a code phase of the code used with the modulation,
• characterized in that the examination of the frequency shift is divided into a first estimation phase and a second estimation phase, wherein the electronic device (23) further comprises
• means (4,18, 36) for dividing the selected frequency area into a first set of frequencies for the first estimation phase,
• means (11) for examining a second set of frequencies nearby each frequency of the first set of frequencies in the second estimation phase, and
• means (16) for performing a comparison for frequencies of the second set of frequencies by using the received signal and the replica code (r),
• and that the examination means comprise means (21, 22) for evaluating the correct frequency shift by using the results of the comparison.