The ambiguity function of PN-chirp pulse signal

The power spectral density function and the ambiguity function(AF) properties of Combination of Chirp Modulation and Pseudonoise Phase Modulation (PN-chirp) pulse signal is analyzed. According to the AF definition of a given finite energy signal, the AF of PN-chirp signal is deduced, and the autocorrelation function of the signal is also obtained. The AF of PN-chirp signal and Pseudonoise Phase Modulation signal are contrasted to show the difference between the two pulse signals. Simulation results show that the AF of PN-chirp signal can be obtained by shearing an angle of the AF of Pseudonoise Phase Modulation signal; Compared with Pseudonoise Phase Modulation signal, PN-chirp signal has a better range accuracy and range resolution. The Doppler sensitivity is also significantly improved.