Abstract:

In order to design high-performance navigation signals in crowded L frequency band, this paper proposes that some of the signals in L band can use minimum shift keying (MSK) modulation. Firstly, the general mathematical model of minimum shift keying-binary offset carrier (MSK-BOC) modulation is established. Then, simulations about the code tracking error, multipath error envelope, autocorrelation function and power spectral density are performed using the typical navigation signals of GPS L1-CA, GPS L1-P(Y) and GPS L1-M. The results are analyzed and indicate that when the navigation signal meets some requirements, the MSK modulation is better than binary phase shift keying (BPSK) modulation.