Equalization of multipath effects in radar signals

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Authors
  1. Kurian, A.P.
  2. Leung, H.
  3. Lee, J.P.Y.
Corporate Authors
Defence R&D Canada - Ottawa, Ottawa ONT (CAN)
Abstract
In electronic warfare (EW), signals emitted from different radars are collected and analyzed for various purposes. The radar signals received often contain multiple Ireturns due to ground or sea surface reflections. These reflections are received at different delays and can result in waveform distortions. This situation can be treated as a convolution of transmitted signal with an unknown channel. Coefficients of such channels are time varying and dependant on the surface reflection characteristics. Waveform distortions can be compensated using appropriate equalization methods at the receiver. Since the amplitude and phase of the unwanted multipath component are unknown to the receiver, blind equalization schemes are suitable. We consider blind equalization schemes, such as, constant modulus algorithm (CMA), higher order statistics (HOS) based algorithms, subspace algorithms and maximization of negative entropies (MNE), in our study. We first simulate a phase coded radar waveform with multipath properties using the sea surface reflection characteristics and 4/3 earth model. Real data collected by DRDC were used to analyze each of the blind equalization schemes. We conclude that the best performance is obtained when training sequence based least mean square algorithm is used for the equalization. In blind equalization, HOS algorithm based on the 4th order cumulant gives the best performance such that it reconstructs the radar waveform more faithfully. We further conclude that

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Report Number
DRDC-OTTAWA-TM-2010-014 — Technical Memorandum
Date of publication
01 Feb 2010
Number of Pages
68
DSTKIM No
CA033915
CANDIS No
533396
Format(s):
Electronic Document(PDF)

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