XU Dongming, CUI Shu, LUO Xiaohong. A Review on GPS Baseband Signal Processing Methods[J]. Electronics Optics & Control, 2021, 28(10): 55
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Global Positioning System (GPS) is widely used in navigationmeasurementemergency communication and other fields.In recent yearsthe scholars are making increasingly intensive researches on acquisition and tracking process of GPS baseband signals.Thereforedifferent acquisition and tracking algorithms are systematically summarized for comparison.According to the processing mode after the mixing of digital Intermediate Frequency (IF) signals with local signalsthe acquisition algorithms can be mainly classified as coherent acquisitionincoherent acquisition and differential coherent acquisitionand a comparison is conducted.According to the function of tracking loopsthe tracking algorithms can be classified as carrier tracking and code loop trackingand a comparison is conducted.The improvements on those acquisition and tracking algorithms in recent years are summarizedand the advantages and disadvantages of the improved algorithms are analyzed.Finallythe prospect of baseband signal acquisition and tracking algorithms is given.