Multipath Interference Removal in Receivers of Linear Frequency Modulated Radar Pulses

Autor:	Rafal Rytel-Andrianik, Karol Abratkiewicz, Piotr Samczynski, Zbigniew Gajo
Rok vydání:	2021
Předmět:	Multipath interference Noise (signal processing) Computer science Acoustics Signal Fractional Fourier transform Time–frequency analysis law.invention law Spectrogram Electrical and Electronic Engineering Radar Instrumentation Multipath propagation
Zdroj:	IEEE Sensors Journal. 21:19000-19012
ISSN:	2379-9153 1530-437X
Popis:	The article describes algorithms for the retrieval of linear frequency modulated (LFM) pulses from a received signal which is corrupted by noise and multipath reflections from ground and stationary objects. Such a problem appears, for example, in electronic intelligence (ELINT) or spectrum sensors that receive and analyze signals originating from an active radar emitting LFM signals. Two computationally efficient methods to solve this problem are presented in this paper. The first is a version of time-frequency filtering based on spectrogram zeros. The second method is based on the chirp rate estimation, fractional Fourier Transform (FrFT) and band-pass filtering to retrieve the original pulse signal. Both of the techniques presented were tested using synthetic signals to measure their statistical properties and then positively verified on real-life recorded signals originating from a non-cooperative radar.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4e03cd615ba5154e09272249b5ab9c12 https://doi.org/10.1109/jsen.2021.3087319 Zobrazit plný text záznamu