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The receiver acquires the BD signals according to pre-defined policies and threshold in the acquiring process. Spoofing Jamming sources can effectively interfere with ordinary BD receivers by generating a false correlation peak and increasing noise floor. In order to detect the spoofing signal,based on the analysis of the influence that the intrusion of spoofing signals can increase noise floor of the receiver, a SNR detection method is proposed to identify spoofing signals during the acquiring process and its effectiveness is analyzed. The receiver adopting this approach has a certain degree of detecting and discriminating spoofing sources,providing a useful reference to improving anti-jamming capability of GNSS receivers.