The Use of Linear Approximations to the Range Cell Migration Curves for the High Resolution Processing of Seasat Sar Images

1984 ◽  
Vol 10 (1) ◽  
pp. 57-67
Author(s):  
M. Benson
Keyword(s):  
Cell Migration ◽  
High Resolution ◽  
Sar Images ◽  
Linear Approximations ◽  
Range Cell ◽  
Range Cell Migration

scholarly journals Modified Chirp Scaling Algorithm for Ultra-High Resolution Spaceborne-SAR

2021 ◽  
Vol 2083 (3) ◽  
pp. 032048
Author(s):  
Tao He ◽  
Pengbo Wang ◽  
Jixiang Ma ◽  
Xinkai Zhou ◽  
Lingling Xue
Keyword(s):  
High Resolution ◽  
Phase Error ◽  
Equation Model ◽  
Synthetic Aperture ◽  
Signal Spectrum ◽  
Integration Time ◽  
Range Cell ◽  
Range Cell Migration ◽  
Range Equation ◽  
Chirp Scaling Algorithm

Abstract The hyperbolic range equation model (HREM) and equivalent squint range model (ESRM) are applied in traditional chirp scaling algorithm (CSA). However, these range models cannot describe the satellite range history in the high-resolution case accurately because of the long azimuth integration time. The non-negligible phase error caused by this will lead the targets distort. In this paper, a modified chirp scaling algorithm (MCSA) is proposed by introducing a novel high-precision range model. A more accurate signal spectrum is calculated through it. Then, the modified chirp scaling factor, range compression filter, range cell migration correction (RCMC) filter and azimuth compression filter can be derived based on this signal spectrum, and the focused target obtained at last. Finally, the experimental results, to validate the proposed algorithm, adopted by the sliding spotlight synthetic aperture radar (SAR) simulation are provided.

Presenting a New Technique for Multi-Target Tracking in Inverse Synthetic Aperture Radar based on PHD Filter in the Presence of Clutters

Frequenz ◽  
2018 ◽  
Vol 72 (7-8) ◽  
pp. 391-399 ◽  
Author(s):  
Hamid Dehghani ◽  
Navid Daryasafar
Keyword(s):  
Cell Migration ◽  
Synthetic Aperture Radar ◽  
Synthetic Aperture ◽  
Moving Targets ◽  
Inverse Synthetic Aperture Radar ◽  
Probability Hypothesis Density ◽  
Implementation Phase ◽  
Range Cell ◽  
Range Cell Migration ◽  
Aperture Radar

Abstract Using Probability Hypothesis Density (PHD) filtering, a novel approach is proposed in this paper for simultaneous tracking of multiple moving targets in received data by Inverse Synthetic Aperture Radar (ISAR) system. Since PHD filtering approach is implemented successively in prediction and update steps, its performance quality will obviously be higher in “Spotlight” imaging mode than in “Stripmap”. Thus, its application to Spotlight mode is generally more logical. The idea to integrate tracking capability into ISAR system processor is to sort radar received data to correct Range Cell Migration (RCM) prior to tracking operations. Clearly, Range Cell Migration Compensation (RCMC) approach is different from this approach in image formation process, in terms of their implementation phase. However, they are implemented in a similar way. As simulation results reveal, applying Range Cell Migration Compensation to the raw data received by ISAR before tracking operation, results in high quality tracking of moving targets.

scholarly journals A Fast High-Resolution Imaging Algorithm for Helicopter-Borne Rotating Array SAR Based on 2-D Chirp-Z Transform

2019 ◽  
Vol 11 (14) ◽  
pp. 1669 ◽  
Author(s):  
Qin ◽  
Li ◽  
Tang ◽  
Zeng ◽  
Li ◽  
...  
Keyword(s):  
High Resolution ◽  
Taylor Series Expansion ◽  
High Resolution Imaging ◽  
Imaging Algorithm ◽  
Range Cell ◽  
Distortion Effect ◽  
Resolution Imaging ◽  
Range Cell Migration ◽  
Azimuth Resolution ◽  
Space Variant

In view of the azimuth resolution of the helicopter-borne rotating array synthetic aperture radar (RoASAR) depending on the azimuth reconstruction angle and the sector distortion caused by the azimuth Deramp processing, this paper proposes an efficient helicopter-borne RoASAR high-resolution imaging algorithm based on two-dimensional (2-D) chirp-z transform (CZT). First, the high-order Taylor series expansion is performed on the slant range, and the accurate 2-D spectral expression of the point target is obtained by using the method of series reversion (MSR). Based on that, the space-variant characteristics of the range cell migration (RCM) terms are analyzed. After that, the space-variant RCM and the sector distortion effect caused by the azimuth Deramp processing are removed by using efficient 2-D CZT, thereby increasing the azimuth reconstruction angle and improving the azimuth resolution. The proposed algorithm is efficient without the interpolation operation, and it is easy to implement in real-time. Finally, the simulations are provided to verify the effectiveness of the proposed algorithm.

scholarly journals Focusing of Spotlight Tandem-Configuration Bistatic Data with Frequency Scaling Algorithm

2016 ◽  
Vol 2016 ◽  
pp. 1-15
Author(s):  
Shichao Chen ◽  
Ming Liu ◽  
Jun Wang ◽  
Fugang Lu ◽  
Mengdao Xing
Keyword(s):  
Cell Migration ◽  
Data Processing ◽  
High Precision ◽  
Frequency Scaling ◽  
Tandem Configuration ◽  
Imaging Algorithm ◽  
Bistatic Sar ◽  
Range Cell ◽  
Sar Data ◽  
Range Cell Migration

A frequency scaling (FS) imaging algorithm is proposed for spotlight bistatic SAR data processing. Range cell migration correction (RCMC) is realized through phase multiplication. The proposed algorithm is insensitive to the length of the baseline due to the high precision of the point target (PT) spectrum that we are based on. It is capable of handling bistatic SAR data with a large baseline to range ratio. The algorithms suitable for small and high squint angles are both discussed according to whether the range dependence of the second range compression (SRC) can be neglected or not. Simulated experiments validate the effectiveness of the proposed algorithm.

Estimation and correction of vibration-induced range cell migration for FMCW synthetic aperture ladar

2020 ◽  
Vol 59 (9) ◽  
pp. 2874
Author(s):  
Guangzuo Li ◽  
Zenghui Zhang ◽  
Yifei Zhang ◽  
Sujuan Fang ◽  
Wen Hong ◽  
...  
Keyword(s):  
Cell Migration ◽  
Synthetic Aperture ◽  
Range Cell ◽  
Range Cell Migration ◽  
Estimation And Correction
Sign in / Sign up

Export Citation Format

Share Document