A Modified Single-Base Equivalent Imaging Algorithm for MEO Space-Missile Borne BiSAR

The MEO space-missile borne bistatic synthetic aperture radar (SMB-BiSAR), which places the transceiver platform in the medium earth orbit (MEO) and the missile, can image the key areas with a wide range and high mobility, with broad application prospects. In this paper, a modified single-base equivalent imaging algorithm for the level flight stage of the missile is proposed, which can fit the acceleration of the MEO satellite. First, the geometric model of the MEO space-missile borne BiSAR is established and the coordinate system transformation is analyzed. Then, a modified single-base range model is proposed, which can improve the accuracy by adding a compensation term. A more accurate two-dimensional spectrum using the method of series reversion is also obtained. Afterward, an effective imaging approach is addressed consequently to the analysis of each component of the spectrum under the satellite trajectory bending and missile squinting configuration. Results of simulation verify the effectiveness of the novel algorithm proposed in this article.