Based on the decisive factor of navigation signal, both advantage and disadvantage of different multiple access technologies which are adopted by the design of navigation signal are analyzed in this paper. The distinction between Locata signal and GPS satellite navigation signal is introduced through the constituent and characteristic of Locata signal. The simulation shows the compatibility between Locata signal and GPS C/A code signal which based on the research about correlation and cross-correlation. Finally, the attentions are considered when the compatibility receiving between Locata signal and GPS C/A code signal.