Three-Dimensional Imaging Algorithm for Forward-Moving ROSAR

Author

Ke Yang ; Guisheng Liao ; Wei Wang ; Qing Xu

Author_Institution

Nat. Lab. of Radar Signal Process., Xidian Univ., Xian, China

Volume

11

Issue

6

fYear

2014

fDate

Jun-14

Firstpage

1076

Lastpage

1080

Abstract

In this letter, we present the mode of forward-moving rotor synthetic aperture radar (ROSAR) to achieve 3-D imaging for the front area of the low-altitude aircraft. First, the geometric model is given, and the signal property is analyzed. Based on which, spatial offsets and coupling in the azimuth and along-track directions are corrected in the frequency domain, and then, the forward-moving ROSAR is simplified as a “stop-and-go” mode in the along-track direction. After 2-D imaging in the range-azimuth direction, a 3-D image can be obtained by range-along-track focusing with the improved range-Doppler algorithm. Moreover, azimuth depth of focusing is also given to maintain the imaging quality. Finally, simulation results prove the feasibility and effectiveness of the proposed method for this new imaging mode.

Keywords

Doppler radar; airborne radar; focusing; frequency-domain analysis; geometry; radar imaging; radar tracking; rotors (mechanical); synthetic aperture radar; 2D imaging; 3D imaging algorithm; azimuth depth of focusing; forward moving ROSAR; frequency domain analysis; front area; geometric model; imaging quality; improved range-Doppler algorithm; low altitude aircraft; range-along-track focusing; range-azimuth direction; rotor synthetic aperture radar; signal property analysis; spatial offsets; stop-and-go mode; Aircraft; Antennas; Azimuth; Frequency-domain analysis; Imaging; Radar imaging; Synthetic aperture radar; 3-D imaging; Improved range–Doppler algorithm; Improved range??Doppler algorithm; offset correction; rotor synthetic aperture radar (SAR) (ROSAR);

fLanguage

English

Journal_Title

Geoscience and Remote Sensing Letters, IEEE

Publisher

ieee

ISSN

1545-598X

Type

jour

DOI

10.1109/LGRS.2013.2286161

Filename

6674979