Blind Estimation of GPS M-Code Signals under Noncooperative Conditions

Figure 2

Spectra of the GPS L1 signals. The L1-band signal contains three kinds of signals: C/A-code, P(Y)-code, and M-code signals. These signals use different types of modulation. The bandwidth of the M code reaches 30 MHz, which is larger than the 20 MHz bandwidth of the P code.