A Space–Time Coding Array Sidelobe Optimization Method Combining Array Element Spatial Coding and Mismatched Filtering

Digital array radar (DAR) can fully realize digitalization at both the transmitting and receiving ends. However, the development of freedom at the transmitting end is far from mature. So, the new concept of multi-dimensional waveform coding array has appeared, which can optimize the transmitting res...

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Bibliographic Details
Published in:Remote sensing (Basel, Switzerland) Vol. 16; no. 17; p. 3322
Main Authors: Wang, Shenjing, He, Feng, Dong, Zhen
Format: Journal Article
Language:English
Published: Basel MDPI AG 01.09.2024
Subjects:
Coding
Comparative analysis
Design
Design optimization
digital beamforming (DBF)
Digital technology
Digitization
Filter design (mathematics)
mismatched filter (MSF)
multi-dimensional ambiguity function
multi-input and multi-output (MIMO)
Optimization
radar
Radar arrays
Radar systems
Resonance
sidelobe optimization
Sidelobe reduction
Sidelobes
Signal processing
Simulation
space and time
space–time coding array (STCA)
system optimization
Time lag
Transmission
Waveforms
ISSN:2072-4292, 2072-4292
Online Access:Get full text
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Summary:Digital array radar (DAR) can fully realize digitalization at both the transmitting and receiving ends. However, the development of freedom at the transmitting end is far from mature. So, the new concept of multi-dimensional waveform coding array has appeared, which can optimize the transmitting resources in space–time/frequency waveform or another dimension. Space–time coding array (STCA) is a typical kind of multi-dimensional waveform coding array, which can make full use of the high degree of freedom at the transmitting end. It realizes emission diversity by introducing a small time delay between different transmission array elements. In this paper, an optimization method for STCA, which combines the array spatial coding at the transmitting end and mismatched filter design at the receiving end, is proposed. This method aims to solve the sidelobe problems of STCA: the inherent resonance phenomenon and the resolution loss problem. The experimental verification and quantitative comparative analysis prove the effectiveness of the proposed method. The resolution is restored to the ideal level under the premise of maintaining the beam-scanning ability and ultra-low sidelobe, and the resonance phenomenon caused by spectrum discontinuity is eliminated simultaneously.
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ISSN:2072-4292
2072-4292
DOI:10.3390/rs16173322