Title :
Improvements of ROPE in ISAR Motion compensation
Author :
Wang, Ling ; Zhu, Daiyin ; Zhu, Zhaoda
Author_Institution :
Nanjing Univ. of Aeronaut. & Astronaut., Nanjing
Abstract :
Motion compensation in inverse synthetic aperture radar (ISAR) usually consists of two parts: range alignment and phase compensation. In this paper, the rank one phase estimation (ROPE) algorithm is applied to the ISAR phase compensation. Its blind setting of zero Doppler frequency at the start is avoided greatly by circular shifting the poorly focused strongest scatterer in each range bin to the zero Doppler frequency. Moreover, the iteration is introduced to further increase the phase estimation precision of ROPE. Compared with PGA, a good phase compensation algorithm, the improved ROPE doesn ´t require a relatively focused image at the beginning, and can remove the high frequency phase errors and random phase errors effectively. The processing of ISAR real data verifies the good performance of the improved ROPE.
Keywords :
Doppler radar; motion compensation; phase estimation; radar imaging; synthetic aperture radar; Doppler frequency; ISAR motion compensation; frequency phase error; inverse synthetic aperture radar; phase compensation algorithm; random phase error; range alignment; rank one phase estimation algorithm; Electronics packaging; Focusing; Frequency estimation; Inverse synthetic aperture radar; Iterative algorithms; Motion compensation; Phase estimation; Radar imaging; Radar scattering; Signal to noise ratio; Inverse synthetic aperture radar (ISAR); phase compensation; phase gradient autofocus (PGA); rank one phase estimation (ROPE;
Conference_Titel :
Synthetic Aperture Radar, 2007. APSAR 2007. 1st Asian and Pacific Conference on
Conference_Location :
Huangshan
Print_ISBN :
978-1-4244-1188-7
Electronic_ISBN :
978-1-4244-1188-7
DOI :
10.1109/APSAR.2007.4418716
