Multiple Narrow-band signals Direction Finding with TMLA by Nonuniform Period Modulation

TL;DR

This paper introduces a novel nonuniform period modulation technique for array signal reconstruction and DOA estimation, enabling separation of harmonic components and accurate direction finding of multiple narrow-band signals.

Contribution

It proposes a new method using nonuniform period modulation with TMLA for improved array signal reconstruction and DOA estimation, capable of handling narrowband signals and estimating multiple incident angles.

Findings

Method effectively separates harmonic components.

Accurately estimates multiple incident angles.

Applicable to narrowband signals with short frequency domain duration.

Abstract

A new array signal reconstruction and signal-channel DOA estimation method based on TMLA by nonuniform period modulation are proposed. By using non-uniform period modulation, the harmonic component produced by different elements could be separated. Therefore, the conventional snapshot could be reconstructed by analyzing the spectrum of the combined signal. Then spatial spectrum estimation method is used to implement DOA estimation. Numerical simulations are provided to verify the feasibility and accuracy of the proposed method. Since the duration of the signal in the frequency domain analysis processed in a single time is very short, this method is also applicable to narrowband signals. Another highlight is that this method can simultaneously measure the number of the elements-1 angle of incident signals.