Abstract
This paper proposes SAR imaging algorithm with largest coherence based on the existing SAR imaging algorithm. The basic idea of SAR imaging algorithm in imaging processing is that output signal can have maximum signal-to-noise ratio (SNR) by using the optimal imaging parameters. Traditional imaging algorithm can acquire the best focusing effect, but would bring the decoherence phenomenon in subsequent interference process. Algorithm proposed in this paper is that SAR echo adopts consistent imaging parameters in focusing processing. Although the SNR of the output signal is reduced slightly, their coherence is ensured greatly, and finally the interferogram with high quality is obtained. In this paper, two scenes of Envisat ASAR data in Zhangbei are employed to conduct experiment for this algorithm. Compared with the interferogram from the traditional algorithm, the results show that this algorithm is more suitable for SAR interferometry (InSAR) research and application.
Highlights
IntroductionIt needs to have certain conditions for the stable interference generation
In physics, it needs to have certain conditions for the stable interference generation
For decorrelation due to azimuth doppler centroid shift, this paper proposes the imaging algorithm that consistent matched filter is adopted in focusing process to ensure the greatest coherence so as to acquire the interferogram with high quality
Summary
It needs to have certain conditions for the stable interference generation. When the two columns of wave to meet have the same frequency, will there appear interference phenomenon and stable interference pattern be formed. The coherence of two interference pairs would be reduced due to decoherence factors such as imaging posture and terrain features, and the generated interferogram quality will be influenced. The generation of interference fringes with high quality in InSAR technology is an important prerequisite for obtaining the elevation and deformation with high accuracy. The coherence is a key index to evaluate the interferogram quality, which is that the carrier of the linear frequency modulation signal and reference signal maintain a constant phase difference, and will not change with time changing [1]. Correlation coefficient is used to PLOS ONE | DOI:10.1371/journal.pone.0148823 February 12, 2016
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
