Range ambiguity suppression for spaceborne SAR based on up/down chirp modulation and twice range compressions

There exists some range ambiguity areas for spaceborne synthetic aperture radar (SAR) with higher pulse repetition frequency (PRF), and range ambiguity to signal ratio (RASR) is very important for application but hard to suppress. In this paper, linear frequency modulation (LFM) pulses with up and down chirp were transmitted and twice range compressions are implemented during image formation. Rang...