关键词: GPS, 载噪比, 导航位, VSM, PRM, MVM

Abstract: In order to analyze and estimate the important technical parameter C/N_0, firstly, expatiations of two classical estimation methods VSM (variance summing method) and PRM(power ratio method) are put forward, which are based on the same GPS signal and noise expressions. The reason why the M parameter for PRM should be set that way is presented. A new estimation algorithm MVM(max frequency component divided variance method) is proposed. After that, it analyzes how the navigation data transition impacts on the three algorithms, and enhances the PRM method's immunity from the effects of navigation data transition. Finally, a comparative analysis to these three algorithms in accuracy and stability is provided.

Key words: GPS, C/N_0, navigation bit, VSM, PRM, MVM