Performance analysis of sidelobe cancellation method has been carried out in this paper. Binary offset carrier (BOC) modulation, which is an advanced modulation technique, is used in modern global navigation satellite systems (GNSS). Acquisition of BOC (m,n) modulated signal is an important activity and Sidelobe cancellation method (SCM) is one of the generic methods used for unambiguous acquisition of BOC(m,n) modulated signals. This paper infers that relationship between different values of m and n has an impact on the overall performance of SCM for detection of unambiguous BOC (m,n) signal after detailed simulation with and without noise.