PRF Design Method for SAR Imaging of High-Speed Maneuvering Platform
In the synthetic aperture radar(SAR)imaging system of high-speed maneuvering platform,the existing design methods of pulse repetition frequency(PRF)have some shortcomings including that the lower bound for the PRF calculated based on the azimuth signal bandwidth is too high,and the factor of radar's duty ratio is neglected.In view of the above problems,firstly,a set of constraint equations that related to PRF and duty ratio are derived to avoid the fac-tors such as transmitting pulse interference,echo interference directly below the platform and range ambiguity.Then,a new design method for the lower bound of PRF in the case of range sectioned SAR imaging is proposed.The simulation results show that the proposed method can achieve a smaller PRF lower limit when highly squinted spotlight SAR imag-ing seeker moves at a high speed,which effectively expands the range of PRF selection and can better meet the need of practical engineering applications.
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