Factorized Geometrical Autofocus at UHF-band
Paper i proceeding, 2019

This paper describes an autofocus experiment at UHF-band. That is within the scope of factorized geometrical autofocus (FGA). The FGA algorithm is a base-2 fast factorized back-projection (FFBP) formulation with six free geometry parameters (per sub-aperture pair). These are tuned step-by step until a sharp image is obtained. This innovative autofocus technique can compensate completely for an erroneous geometry. The FGA algorithm has been applied successfully on an UWB data set, acquired by the LORA system (i.e. at UHF band). Before processing, we add errors due to a constant quadratic bias to the measured track. This emulates a drifting inertial measurement unit (IMU) and motivates the use of autofocus. The resulting FGA image is compared to a reference image and verified to be focused (even sharper actually). Hence, the FGA algorithm is fit for use at UHF-band.

back-projection

UHF

FGA

SAR

Autofocus

Författare

Jan Torgrimsson

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Lars Ulander

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Patrik Dammert

Saab AB

2019 International Radar Conference, RADAR 2019

9079135

2019 International Radar Conference, RADAR 2019
Toulon, France,

Ämneskategorier

Signalbehandling

Datorseende och robotik (autonoma system)

DOI

10.1109/RADAR41533.2019.171417

Mer information

Senast uppdaterat

2020-12-07