Abstract
The successful design of an orthogonal waveform set is crucial for orthogonal netted radar systems and MIMO radar systems. An orthogonal waveform set design method of time-stagger coding and hyperbolic coding stepped-frequency linear frequency modulated (SFLFM) pulse train is proposed in this paper. First, the transmitting time of SFLFM subpulses is time-stagger coded to decrease the autocorrelation sidelobe peaks (ASP) and cross-correlation peaks (CCP) when |τ|≥Tp, where τ is the time delay and Tp is the subpulse duration. Then the frequency firing order of the SFLFM subpulses for every waveform is hyperbolic coded to lower the CCP when |τ|<Tp. When the subpulse number of SFLFM pulse train is N, the ASP and CCP of the designed orthogonal waveform set is approximately 1/N. The design procedure of the proposed method is demonstrated via a case study, and the orthogonality of the designed waveform set is verified by simulating the autocorrelation function, cross-correlation function, auto-ambiguity function and cross-ambiguity function.
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