6. Appendices

6.1 Apodization

Apodization (the aim is to remove the "feet" of the ambiguity function) – is also known as "weighting" (this is the method used) – is a rustic spatial filtering method which reduces the level of the secondary lobes of classical processing at the cost of increasing the width of its main lobe (Woodward's theorem).

In addition to the usual rephasing of conventional processing, this method involves multiplying each sensor by a positive scalar ${\omega }_k$ (real) less than 1 (attenuator) (figure