关键词: GPS, 高灵敏度, Viterbi, 跟踪

Abstract: High sensitivity GPS receiver has become a hot research topic with the need of navigation in the scenarios covered by woods or indoor. GPS weak signal tracking is one of the key issues that must be solved. Referring to the characteristics of weak GPS signal, a new weak signal tracking method based on Viterbi algorithm is developed. Simulation results show that: the tracking threshold can reach 11dB/Hz and 16dB/Hz respectively if the Doppler rate of signal is less than 10Hz/s(0.2g) and 50Hz/s(1g). So the algorithm can get high sensitivity even in low dynamic. What’s more, the method can be implemented conveniently with not too much computation.

Key words: GPS, high sensitivity, Viterbi, tracking