Open Access

Application of Frequency Diversity to Suppress Grating Lobes in Coherent MIMO Radar with Separated Subapertures

EURASIP Journal on Advances in Signal Processing20092009:481792

https://doi.org/10.1155/2009/481792

Received: 5 June 2008

Accepted: 1 May 2009

Published: 8 June 2009

Abstract

A method based on frequency diversity to suppress grating lobes in coherent MIMO radar with separated subapertures is proposed. By transmitting orthogonal waveforms from separated subapertures or subarrays, receiving beams can be formed at the receiving end with the same mainlobe direction. However, grating lobes would change to different positions if the frequencies of the radiated waveforms are incremented by a frequency offset from subarray to subarray. Coherently combining the beams can suppress or average grating lobes to a low level. We show that the resultant transmit-receive beampattern is composed of the range-dependent transmitting beam and the combined receiving beam. It is demonstrated that the range-dependent transmitting beam can also be frequency offset-dependent. Precisely directing the transmitting beam to a target with a known range and a known angle can be achieved by properly selecting a set of . The suppression effects of different schemes of selecting are evaluated and studied by simulation.

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Authors’ Affiliations

(1)
Department of Electronic Engineering, Shanghai Jiao Tong University

Copyright

© L. Zhuang and X. Liu. 2009

This article is published under license to BioMed Central Ltd. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.