Tomography of well localized ionospheric irregularities (LII) based on P-band spaceborne SAR

In this paper, the tomography of well LII based on spaceborne P-band SAR is investigated. A mandatory requirement of the proposed approach is that the echoes scattered by LII can be well separated from the SAR echoes scattered from the target on the ground. According to this requirement, the lower pulse repetition frequency (PRF) of SAR is required, which is not permitted by traditional P-band spaceborne SAR system; however, the new theory, named as compressive sensing (CS), developed recently by Donoho et al has shown that the data required by traditional SAR can be retrieved from the data sampled by a PRF much smaller than the Nyquist sampling, i.e. the PRF required by traditional SAR system.