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Sensors 2016, 16(6), 817;

A Novel Monopulse Angle Estimation Method for Wideband LFM Radars

Department of Communication Engineering, Xiamen University, Xiamen 361005, China
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Scott Palo
Received: 24 March 2016 / Revised: 16 May 2016 / Accepted: 27 May 2016 / Published: 3 June 2016
(This article belongs to the Section Remote Sensors)
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Traditional monopulse angle estimations are mainly based on phase comparison and amplitude comparison methods, which are commonly adopted in narrowband radars. In modern radar systems, wideband radars are becoming more and more important, while the angle estimation for wideband signals is little studied in previous works. As noise in wideband radars has larger bandwidth than narrowband radars, the challenge lies in the accumulation of energy from the high resolution range profile (HRRP) of monopulse. In wideband radars, linear frequency modulated (LFM) signals are frequently utilized. In this paper, we investigate the monopulse angle estimation problem for wideband LFM signals. To accumulate the energy of the received echo signals from different scatterers of a target, we propose utilizing a cross-correlation operation, which can achieve a good performance in low signal-to-noise ratio (SNR) conditions. In the proposed algorithm, the problem of angle estimation is converted to estimating the frequency of the cross-correlation function (CCF). Experimental results demonstrate the similar performance of the proposed algorithm compared with the traditional amplitude comparison method. It means that the proposed method for angle estimation can be adopted. When adopting the proposed method, future radars may only need wideband signals for both tracking and imaging, which can greatly increase the data rate and strengthen the capability of anti-jamming. More importantly, the estimated angle will not become ambiguous under an arbitrary angle, which can significantly extend the estimated angle range in wideband radars. View Full-Text
Keywords: wideband LFM signals; monopulse angle estimation; amplitude comparison; cross-correlation; frequency estimation wideband LFM signals; monopulse angle estimation; amplitude comparison; cross-correlation; frequency estimation

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Zhang, Y.-X.; Liu, Q.-F.; Hong, R.-J.; Pan, P.-P.; Deng, Z.-M. A Novel Monopulse Angle Estimation Method for Wideband LFM Radars. Sensors 2016, 16, 817.

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