This paper describes the C-band multi-polarization Synthetic Aperture Radar (SAR) sensor for the Gaofen-3 (GF-3) mission. Based on the requirement analysis, the design of working modes and SAR payload are given. An accurate antenna model is introduced for the pattern optimization and SAR performance calculation. The paper concludes with an overview of predicted performance which was verified by in-orbit tests.
Signals with sparse frame representations comprise a much more realistic model of nature than that with orthonomal bases. Studies about the signal recovery associated with such sparsity models have been one of major focuses in compressed sensing. In such settings, one important and widely used signal recovery approach is known as ℓ 1synthesis (or Basis Pursuit). We present in this article a more effective performance analysis (than what are available) of this approach in which the dictionary D may be highly, and even perfectly correlated. Under suitable conditions on the sensing matrix Φ, an error bound of the recovered signalf (by the ℓ 1 -synthesis method) is established. Such an error bound is governed by the decaying property ofD * o f , where f is the true signal andD o denotes the optimal dual frame of D in the sense that D * of 1 produces the smallest D * f 1 in value among all dual framesD of D and all feasible signalsf . This new performance analysis departs from the usual description of the combo ΦD, and places the description on Φ. Examples are demonstrated to show that when the usual analysis fails to explain the working performance of the synthesis approach, the newly established results do.
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