Receiver for acquiring and tracking spread spectrum navigation signals with changing subcarriers

摘要

The invention relates to a receiver (10.1-10.4) for acquiring and tracking a spread spectrum navigation signal with changing subcarriers, wherein the spread spectrum navigation signal has a carrier signal changing between several subcarriers according to a hopping frequency and being modulated with data and a pseudorandom noise code signal, wherein the receiver comprises a carrier wipe off unit (16; 17) for down converting a received spread spectrum navigation signal from its carrier frequency to a baseband frequency, a frequency hopping wipe off unit (36; 17) for wiping off the hopping frequency from the received spread spectrum navigation signal, a replica signal generation unit (26, 28, 30, 32, 34) for generating at least one replica signal of the pseudorandom noise code signal for acquiring and tracking the received spread spectrum navigation signal after carrier wipe off, wherein the generation of the at least one replica signal is performed depending on a sojourn time THi of the spread spectrum navigation signal at a subcarrier and a selected predetection integration time Tint, and a correlation and integration unit (24) for correlating and integrating the received spread spectrum navigation signal after carrier wipe off with the at least one replica signal for the selected predetection integration time Tint.