scholarly journals An Accurate Measurement Method for Azimuth Pointing of Spaceborne Synthetic Aperture Radar Antenna Beams Based on Ground Receiver

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2626 ◽  
Author(s):  
Weibin Liang ◽  
Zengzeng Jia ◽  
Lihong Kang ◽  
Jun Hong ◽  
Bin Lei ◽  
...  
Keyword(s):  
Synthetic Aperture Radar ◽  
Low Earth Orbit ◽  
Synthetic Aperture ◽  
Complex Sampling ◽  
Satellite Experiment ◽  
Range Migration ◽  
Radar Antenna ◽  
Over The Top ◽  
Better Than ◽  
Aperture Radar

The paper proposes a new method for measuring the azimuth pointing of spaceborne synthetic aperture radar (SAR) antenna beams based on the ground receiver, which can receive and record complex sampling data of the pulse signals transmitted from the spaceborne SAR. The center of the antenna pattern is extracted from the complex sampling data amplitude envelope to obtain the time when the beam main lobe center irradiates the ground receiver, and the range migration information is extracted from the complex sampling data to obtain the time when the satellite is over the top of the ground receiver. The results of Chinese civilian remote sensing GaoFen-3 SAR satellite experiment data processing show that the measurement accuracy of this method is better than 0.002°, which can be applied to the accurate measurement of azimuth pointing of various low Earth orbit (LEO) SAR antenna beams.

scholarly journals A Signal Processing Algorithm Based on 2D Matched Filtering for SSAR

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Shouguo Yang ◽  
Yong Li ◽  
Kunhui Zhang ◽  
Jianshe Liu
Keyword(s):  
Signal Processing ◽  
Synthetic Aperture Radar ◽  
Processing Algorithm ◽  
Synthetic Aperture ◽  
Matched Filtering ◽  
Target Velocity ◽  
Signal Processing Algorithm ◽  
Line Scan ◽  
Radar Antenna ◽  
Aperture Radar

This study discusses a smart radar antenna scanning mode that combines features of both the sector-scan mode used for conventional radar and the line-scan mode used for synthetic aperture radar (SAR) and achieves an application of the synthetic aperture technique in the conventional sector-scan (mechanically scanned) radar, and we refer to this mode as sector-scan synthetic aperture radar (SSAR). The mathematical model is presented based on the principle of SSAR, and a signal processing algorithm is proposed based on the idea of two-dimensional (2D) matched filtering. The influences of the line-scan range and speed on the SSAR system are analyzed, and the solution to the problem that the target velocity is very high is given. The performance of the proposed algorithm is evaluated through computer simulations. The simulation results indicate that the proposed signal processing algorithm of SSAR can gather the signal energy of targets, thereby improving the ability to detect dim targets.

scholarly journals Generalized range migration algorithm for synthetic aperture radar image reconstruction of metasurface antenna measurements

2017 ◽  
Vol 34 (12) ◽  
pp. 2610 ◽  
Author(s):  
Aaron V. Diebold ◽  
Laura Pulido-Mancera ◽  
Timothy Sleasman ◽  
Michael Boyarsky ◽  
Mohammadreza F. Imani ◽  
...  
Keyword(s):  
Image Reconstruction ◽  
Synthetic Aperture Radar ◽  
Synthetic Aperture Radar Image ◽  
Radar Image ◽  
Synthetic Aperture ◽  
Antenna Measurements ◽  
Range Migration ◽  
Aperture Radar

On the Performance of the MPI Algorithm for the Retrieval of Significant Wave Height From ERS Synthetic Aperture Radar

2003 ◽  
Author(s):  
Nelson Violante-Carvalho ◽  
Ian S. Robinson
Keyword(s):  
Synthetic Aperture Radar ◽  
Wave Height ◽  
Significant Wave Height ◽  
Synthetic Aperture ◽  
Wave Spectra ◽  
Sar Images ◽  
Significant Wave ◽  
Directional Wave ◽  
Better Than ◽  
Aperture Radar

Spaceborne Synthetic Aperture Radar (SAR) is to date the only source of two dimensional directional wave spectra with continuous and global coverage when operated in the so-called SAR Wave Mode (SWM). Since the launch in 1991 of the first European Remote Sensing Satellite ERS-1 and more recently with ENVISAT millions of SWM imagettes containing detailed spectral information are now available in quasi-real time. This huge amount of directional wave data has opened up many exciting possibilities for the improvement of our knowledge of the dynamics of ocean waves. However the retrieval of wave spectra from SAR images is not a trivial exercise due to the nonlinearities involved in the mapping mechanism. The Max-Planck Institut (MPI) scheme was the first ever proposed and most widely used algorithm to retrieve directional wave spectra from SAR images. In this work significant wave height retrieved from SAR images using the MPI scheme are compared against one year of directional buoy measurements obtained in deep water and against WAM spectra. Our results show that for periods shorter than 12 seconds the WAM model performs better than the MPI method, even considering the fact that the model is used as first guess to the MPI scheme. However, for periods longer than 12 seconds (the part of the spectrum directly observed by SAR) the MPI method performs better than WAM. This is in contrast with the results obtained by Voorrips et al. (2001), who found that the performance of the WAM model is superior even when only the low wavenumber part of the spectrum is considered.

Deramp range migration processing for space-borne spotlight synthetic aperture radar

2008 ◽  
Vol 41 (11) ◽  
pp. 1822-1826 ◽  
Author(s):  
Zegang Ding ◽  
Teng Long ◽  
Tao Zeng ◽  
Yu Zhu
Keyword(s):  
Synthetic Aperture Radar ◽  
Synthetic Aperture ◽  
Range Migration ◽  
Aperture Radar
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