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Exploiting MIMO SAR potentialities with efficient cross-track constellation configurations for improved range resolution

: Cristallini, D.; Pastina, D.; Lombardo, P.


IEEE transactions on geoscience and remote sensing (2011), S.38-52
ISSN: 0196-2892
ISSN: 0018-9413
Fraunhofer FHR

In this paper, an innovative technique is presented for synthetic aperture radar (SAR) ground range resolution improvement using multiple transmit and receive platforms with adequate cross-track displacement. Using orthogonal waveforms, which occupy the same bandwidth in the range frequency domain, for the different platforms of the constellation, a multiple-input-multiple-output SAR system is configured. The proposed technique allows one to achieve a maximum theoretical range resolution improvement factor that is significantly greater than the number of operating SAR sensors by jointly exploiting both mono- and bistatic acquisitions. This can be exploited to obtain a ground range resolution that is much higher than the resolution corresponding to the frequency bandwidth transmitted by the single platform. After illustrating the proposed technique and its system requirements, a simulated data set is used to show the effectiveness of the proposed approach.