access icon free Multilevel delay lock loop approach for wall clutter mitigation in through-the-wall radar imaging

© The Institution of Engineering and Technology
Received 14/03/2018, Accepted 10/05/2018, Revised 02/05/2018, Published 15/06/2018

Wall clutter mitigation is important in through-the-wall imaging (TWI) because the target information is often buried in the wall's reflections, especially when the target is located close to the wall. A new wall clutter mitigation method is proposed based on the multilevel delay lock loop (M-DLL) technique. The M-DLL structure uses the M-sequences’ phase information sequentially remove the direct wave, wall's primary echo and the multiple echoes, then the rest part of the signal is used to probe and estimate the position of the target. The M-DLL can obtain the precise correlation of the signal, and the rest target echo has an enhanced signal-to-noise ratio. This method is used in TWI as a new technique, and the results compared with other methods show that it has an excellent detectability and a good anti-jamming performance.

Inspec keywords: radar signal processing; m-sequences; correlation methods; radar clutter; delay lock loops

Other keywords: TWI; target position estimation; multilevel delay lock loop approach; M-sequences phase information; target information; wall reflections; signal-to-noise ratio; M-DLL technique; wall primary echo; signal correlation; wall clutter mitigation method; anti-jamming performance; through-the-wall radar imaging

Subjects: Codes; Other analogue circuits; Signal processing and detection; Radar theory

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