Abstract: The binary offset carrier(BOC) signals,a new kind of signal used for navigation,were compared with traditional PN code navigation signals.The anti-jamming performance of BOC signals was analyzed by building a mathematical model of BOC signal receiver system.Three radio frequency(RF) interference signal models including carrier wave(CW) interference,matching-spectrum interference and limited-band Gaussian interference were researched.Some anti-jamming performance parameters of navigation signals already used in GPS and Galileo systems were also given.The result shows that BOC signals have a smaller effect on interference than that of the classical spread spectrum navigation ones.