Research And Design Of New Binary Offset Carrier Modulation

With the development of times, TT&C and navigation system become more and more widely used in scientific research, military confrontation, as well as daily life.Therefore, the accuracy, sensitivity requirements, safety performance and anti-jamming performance of distance, speed, positioning accuracy provided by TT&C and navigation system will increase.The binary offset carrier modulation system(BOC) modulation system and its various associated derivatives become a hot topic for its sharp peaks,splitting power spectrum. However, the multiple correlation peaks characteristic will bring wrong lock and even loss of lock. So BOC modulation signal receiver must be designed to use blur-tracking algorithms to have normal operation. But these algorithms will be achieved at the expense of algorithm complexity and difficulty.The aim of this paper is improving the BOC modulation mathematical model to put forward the new offset carrier modulation: Frequency Chirp-BOC(FC-BOC) and Frequency Hop-BOC(FH-BOC). The new modulation is generated by replace the binary offset carrier of BOC with chip or hop offset carrier, in order to inherit the nature of BOC and also have several unique natures.Simulations and experiments show that FC-BOC modulation and FH-BOC modulation retain the primary advantages of BOC modulation; on the other hand,acquire a narrow and sharp correlation main-peak with extremely suppressed side-peaks for avoiding multiple correlation peak ambiguity naturally, flat power spectral density function similar to band-pass white noise for stealth properties and anti-interception performance; furthermore, as the FH-BOC modulation’s hopping is achieved in the baseband, FH-BOC modulation could overcome traditional hopping modulation’s useless of precise positioning of the carrier. In the case of the above excellent properties,the new offset carrier modulation’s(FC-BOC and FH-BOC) generation and receiver algorithm are similar to the structure of BOC modulation.It can be seen that the new offset carrier modulation can be used as a new modulation in precision positioning, speed, navigation applications.