Widely Separated MIMO Radar Using Matrix Completion

TL;DR

This paper introduces a low-complexity WS-MIMO radar system that uses matrix completion to recover missing samples from reduced-rate data, enabling accurate target localization without discretization.

Contribution

It proposes a novel matrix completion-based approach for widely separated MIMO radar that reduces sampling rates while maintaining target detection accuracy.

Findings

Achieves accurate target localization at 20 dB SNR

Reduces sampling rate to 20% of traditional methods

Demonstrates the impact of antenna geometry on performance

Abstract

We present a low-complexity widely separated multiple-input-multiple-output (WS-MIMO) radar that samples the signals at each of its multiple receivers at reduced rates. We process the low-rate samples of all transmit-receive chains at each receiver as data matrices. We demonstrate that each of these matrices is low rank as long as the target moves slowly within a coherent processing interval. We leverage matrix completion (MC) to recover the missing samples of each receiver signal matrix at the common fusion center. Subsequently, we estimate the targets' positions and Doppler velocities via the maximum likelihood method. Our MC-WS-MIMO approach recovers missing samples and thereafter target parameters at reduced rates without discretization. Our analysis using ambiguity functions shows that antenna geometry affects the performance of MC-WS-MIMO. Numerical experiments demonstrate reasonably accurate target localization at SNR of 20 dB and sampling rate reduction to 20%.