Abstract
Radio frequency interference (RFI) is a major issue in accurate remote sensing by a synthetic aperture radar (SAR) system, which poses a great hindrance to raw data collection, image formation, and subsequent interpretation process. This paper provides a comprehensive study of the RFI mitigation techniques applicable for an SAR system. From the view of spectrum allocation, possible terrestrial and spaceborne RFI sources to SAR system and their geometry are analyzed. Typical signal models for various RFI types are provided, together with many illustrative examples from real measured data. Then, advanced signal processing techniques for removing RFI are reviewed. Advantages and drawbacks of each approach are discussed in terms of their applicability. Discussion on the future trends are provided from the perspective of cognitive, integrated, and adaptive. This review serves as a reference for future work on the implementation of the most suitable RFI mitigation scheme for an air-borne or space-borne SAR system.
Highlights
2 of 25 2 of 24 common to find that Synthetic aperture radar (SAR) systems are susceptible to the radio frequency interference (RFI), especially in low-frequency bands like iPn alonwd -Lfrebqaunednc[Eyrbroarn!dRs elifkeerePnacendsoLubrcaendno[3t]f. oFuignudr.e]. 1Fiilgluusrtera1teislluobstsreartveesdoRbsFeIrcvaesdesRfFroI mcasdeisffefrroenmt fdriefqfeureennctyfrbeaqnudesnscpyrbeaadnidnsgsopvreeardthineggloovbearl tahreeag[lo4]b.aTl haerecair[cElerrsowr!itRhedfeiffreenrecnetscooulorcrse cnoortrefsopuonndd.i]n. gThtoe tchireclleoscawtioitnhodf RiffFeIrseonut rcceosloorbssecrovrerdesipnovnadriinogustforetqhueenlocycabtiaonndso. fItRisFsIhsoowunrctehsatoRbsFeIravteldowinbavnadriloikues Lfr-ebqaunednicsyabbaunnddsa.nItt aisnsdhsopwrenadthwatoRrlFdIwaitdleo.wThbeanRdFIliskietuLa-tbioannddiiffsearbsuinndgaenotgraanpdhsicparleaardeaws,oirnldwwhidiceh. tThheewReFllI-dseivtuealotipoenddairfefaerws iitnh dgeenosgerappohpiucalaltiaorneaiss,minucwh hmicohretsheevewree.llF-doreveexlaompepdle,atrheea swituitahtiodnesnisne EpaosptuAlastiiaonanisdmEuucrhopmeoareresemvuerceh
Though many approaches are published for RFI mitigation in SAR data, a thorough summary of current technique status and discussions about future trends is lacking in existing literatures [11,12]
Besides the terrestrial RFI sources, there are few cases with broadcasting signals from other space-borne satellites, such as global navigation satellite systems (GNSSs) constellations, communication satellites or other active remote sensing system, which are regarded as space-borne RReFmIotseoSuenrsc.e2s0.19F,i1g0u, xreFO7Ra PsEhEoRwRsEVthIEeWgeometry of interfering mechanism from space-borne RFI s8ouorf c2e5
Summary
With the advancement of affordable electronics and mobile wireless technology, many more commercial and industry radio services emerged. The proliferation of radio technology increases the likelihood of co-channel interference to active remote sensing systems, especially for those high-resolution SAR systems with large bandwidth like several hundred megahertz [2]. They are referred to as No RFI Area 1 , Low RFI Area 2 , Moderate RFI Area 3 , and Strong RFI Area 4 , respectively. These four distributed areas should have the same scattering mechanism with the one under ideal occasion, i.e., low ISR condition. The erroneous polarization signatures would further bias the interpretation of scattering mechanisms
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
