Near-Range Multipath Mitigation Methodology for Multistatic SAR Applications using Matched Adaptive Filters

Filip Rosu, Andrei Anghel, Silviu Ciochina, Remus Cacoveanu, Mihai Datcu
2022 IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing  
This paper presents a methodology based on matched-adaptive filters that is used to mitigate the effect of nearrange multipath in multistatic SAR systems and transponders. It is challenging to physically construct a bistatic receiver such that the reference signal is not leaked into the received signal, either via coupling in the circuitry or via reflections off objects in the vicinity of the receiver. Due to its much larger amplitude, the reference signal can easily mask near-range targets
more » ... its side-lobes. A similar signal degradation is observed in active transponders that are used for calibrating radar systems, when objects exist in their vicinity. In this paper we address these two issues: the coupling between the reference channel and the imaging channel, and the parasitic echoes present in the transponder response. A novel methodology is proposed that is capable of time-domain filtering the undesired components in real time. The novelty consists in combining matched and adaptive filters as a means of boosting performance and resolution estimation, resulting in an extremely accurate multipath elimination method. The proposed methodology is experimentally evaluated and optimized for each of the two aforementioned problems.
doi:10.1109/jstars.2022.3165470 fatcat:hymbila54zbh3ovlcztrm7bmvm