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Binary offset carrier (BOC) signals commonly used in global navigation satellite system because it can guarantee the coexistence and interoperability with different systems, while it usually causes ambiguity problems and range measurement errors due to the similar magnitude multiple side peaks of the autocorrelation function. The autocorrelation function of the Cosine-phased binary offset carrier (CosBOC) is relatively complicated and brings challenge in the unambiguous tracking. Based on the concept of pseudo correlation function (PCF), this paper proposes specially designed chip spreading symbols of the local reference signals for CosBOC signals. After correlating with the received signal and nonlinear processing, a no side-peak function can be obtained and the ambiguity is eliminated. Results demonstrate that the code tracking and multipath mitigation performances of the proposed method are better than the BPSK -like method on the whole.