Autofocus-based compensation (ABC) system and method for a hovering ground moving target indication (GMTI) sensor

摘要

Embodiments of the present invention generally relate to motion compensation, and in particular to an autofocus-based compensation (ABC) systems and methods for a ground moving target indication platform. According to one embodiment, a method for autofocus based compensation of range data acquired from an object in motion is provided. The method may include: receiving range data; steering at least one receive beam of the range data in a desired direction; transforming the range data into the range domain; determining the width of a main clutter lobe; excluding data that is not part of the main lobe clutter response; transforming the main-lobe clutter response into the range domain; calculating a phase correction term; and applying the phase correction to the original range data.

主权项

1. A method for autofocus based compensation of range data acquired from an object in motion, the method comprising:
receiving, from a sensor mounted on the object in motion, range data comprising frequency measurements at various distances or ranges; and processing the range data, with a processor, by:
steering a main lobe of at least one receive beam of the range data in a desired direction;determining the width of a main-lobe clutter response of the steered beam;excluding data that is not part of the main-lobe clutter response of the steered beam;transforming the main-lobe clutter response of the steered beam into a space vs. frequency domain;calculating a phase correction term for the transformed main-lobe clutter response;transforming the range data into a space vs. time domain; andapplying the phase correction to the transformed range data.