Application of Frequency Diversity to Suppress Grating Lobes in Coherent MIMO Radar with Separated Subapertures. (8th June 2009)

• Record Type: Journal Article
• Authors: Zhuang Zhuang, Long Long; Liu Liu, Xingzhao Xingzhao
• Other Names: Psaromiligkos Psaromiligkos Ioannis Ioannis Academic Editor.
• Is Part Of: EURASIP journal on advances in signal processing. Volume 2009(2009)
• Publication Date: 2009-06-08
• Subjects: Signal processing -- Periodicals; Traitement du signal; Signal processing; Periodicals; 621.3822
• DOI: 10.1155/2009/481792
• Languages: English
• ISSNs: 1687-6172

Abstract

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 M separated subapertures or subarrays, M 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 Δ f from subarray to subarray. Coherently combining the M 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 Δ f . The suppression effects of different schemes of selecting Δ f are evaluated and studied by simulation.