Abstract
By introducing phase code into multicarrier orthogonal frequency division multiplex signal, the multicarrier phase coded (MCPC) radar signal possesses a good spectrum utilization rate and can achieve a good combination of narrowband and wideband processing. Radar pulse train signal not only reserves the high range resolution of monopulse signal, but also has the same velocity resolution performance as continuous wave signal does. In this study, we use the chaotic biphase code generated by Chebyshev mapping to conduct a phase modulation on MCPC pulse train so as to design two different types of multicarrier chaotic phase coded pulse train signal. The ambiguity functions of the two pulse train signals are compared with that of P4 code MCPC pulse train. In addition, we analyze the influences of subcarrier number, phase-modulated bit number, and period number on the pulse train’s autocorrelation performance. The low probability of intercept (LPI) performance of the two signals is also discussed. Simulation results show that the designed pulse train signals have a thumbtack ambiguity function, a periodic autocorrelation side lobe lower than P4 code MCPC pulse train, and excellent LPI performance, as well as the feature of waveform diversity.
Highlights
The multicarrier phase coded (MCPC) signal based on OFDM technique [1] is a new wideband radar signal which has attracted much attention recently
In literature [5], the features of MCPC signal and frequency stepped signal were combined to propose the multicarrier phase coded frequency stepped radar signal, which has a high range resolution yet has the defect of range-Doppler coupling
The simulation compares the ambiguity of the INS MCPC and NNS MCPC pulse train signals based on P4 code with that of Chaos NNS MCPC I and Chaos NNS MCPC II proposed in this study
Summary
The MCPC signal based on OFDM technique [1] is a new wideband radar signal which has attracted much attention recently It has a flexible structure, a thumbtack ambiguity function. Starting from OFDM signal, Levanon and Mozeson [2] analyzed the structure, spectrum, ambiguity function, autocorrelation, and power spectrum of monopulse, continuous wave, and pulse train of MCPC signal. MCPC signal has a flexible structure, and different pulse train signals can be obtained using different phase coding methods. It overcomes many shortcomings of the noise signal, such as the difficulties of generation, replication, and application These properties of chaotic signal conform to the low probability of intercept (LPI) and antijamming requirements for modern radar. The ambiguity function as well as the autocorrelation performance of the signal is simulated, and the LPI performance is analyzed
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