Title :
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
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);
Journal_Title :
Geoscience and Remote Sensing Letters, IEEE
DOI :
10.1109/LGRS.2013.2286161
