Estimating the target DOA, range and velocity using subspace methods in a MIMO OFDM DFRC system

•With a Swerling model for target RCS, range and velocity are estimated using subspace methods with a few assumptions made.•To relax the above assumptions, LS/TLS methods can be considered.•A comparative study with the Fourier Transform and Lasso-based methods is presented.•The proposed methods are...

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Bibliographic Details
Published in:Signal processing 2023-08, Vol.209, p.109007, Article 109007
Main Authors: Bhogavalli, Satwika, Hari, K.V.S., Grivel, Eric, Corretja, Vincent
Format: Article
Language:English
Subjects:
DFRC
DOA
Engineering Sciences
Least squares
Range
Subspace methods
Velocity
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Summary:•With a Swerling model for target RCS, range and velocity are estimated using subspace methods with a few assumptions made.•To relax the above assumptions, LS/TLS methods can be considered.•A comparative study with the Fourier Transform and Lasso-based methods is presented.•The proposed methods are also compared with the Cramer–Rao bound.•A trade-off between target parameter estimation accuracy and data rate is studied. Dual-function Radar communication (DFRC) systems implement Radar detection and communication using the same hardware simultaneously. Significant attention has been paid to a multiple-input multiple-output DFRC system based on orthogonal frequency division multiplexing (OFDM). So far, the directions of arrival of the targets have been well estimated using subspace methods. In this paper, the ranges and/or velocities are estimated using the subspace methods. To this end, the Radar waveform must be based on the data symbols that are replicated over a few sub-carriers and/or during a few OFDM symbols. To avoid data replication, the target ranges and velocities can be estimated based on a least-squares (LS) or total LS method. After giving a few practical considerations, simulation results show that the proposed approaches outperform the existing ones based on the Fourier transform and/or Lasso algorithm. The performance of the proposed approaches is compared with the Cramer–Rao bound. Moreover, we show how the performance of the DFRC system (in terms of the accuracy of the estimated target parameters and data rate) evolves when modifying the system parameters, such as the number of sub-carriers and the number of OFDM symbols.
ISSN:0165-1684
1872-7557
DOI:10.1016/j.sigpro.2023.109007