Direct signal´s impact on BISAR signal formation and image reconstruction

In this work the evaluation of the direct signal impact on the process of signal formation and image reconstruction, and on the quality of the reconstructed image in Bistatic Inverse Synthetic Aperture Radar (BISAR) is discussed. Geometric description of BISAR topology with space-based transmitter and receiver, and moving target is given. Kinematic vector equations are derived. The composition of the BISAR pulse signal with linear frequency modulation (LFM) reflected from the object and direct signal from the transmitter is analytically described. Image reconstruction algorithm is suggested. Numerical experiments to verify the composed signal model and imaging algorithm are carried out.