Bistatic SAR/GISAR/FISAR Geometry, Signal Models and Imaging Algorithms

4

BSAR Image Reconstruction Algorithms

Bistatic synthetic aperture radar (BSAR) image reconstruction is a procedure of image function extraction from the BSAR signal, reflected by the illuminated object. It is assumed that the type of reference signal, the emitted waveform, is preliminarily known in the receiving part of the BSAR scenario, and the synchronization process is not considered. The type of emitted waveforms generally identifies the basic operations included in the image reconstruction algorithms. The emphasis is on image reconstruction procedures based on the short-pulse BSAR signal, the linear frequency modulated (LFM) BSAR signal and the phase code modulated (PCM) BSAR signals.

4.1. Image reconstruction from a short pulse BSAR signal

The image extraction algorithms can be retrieved from the expressions described in the process of BSAR signal formation. On the basis of the signal formation procedure described in equation [3.3], the following equation can be rewritten as [LAZ 13c]

[4.1]

Formally, for each kth range cell, the image function can be extracted by the inverse transform

[4.2]

where p is the number of emitted pulses and N is the full number of emitted pulses during coherent processing interval (CPI).

Because of the two-dimensional (2D) signal , only a 2D image ...