Multi-Target Parameter Estimation of the FMCW-MIMO Radar Based on the Pseudo-Noise Resampling Method

Abstract

Subspace methods are widely used in FMCW-MIMO radars for target parameter estimations. However, the performances of the existing algorithms degrade rapidly in non-ideal situations. For example, a small number of snapshots may result in the distortion of the covariance matrix estimation and a low signal-to-noise ratio (SNR) can lead to subspace leakage problems, which affects the parameter estimation accuracy. In this paper, a joint DOA–range estimation algorithm is proposed to solve the above issues. Firstly, the improved unitary root-MUSIC algorithm is applied to reduce the influence of non-ideal terms in building the covariance matrix. Subsequently, the least squares method is employed to process the data and obtain paired range estimation. However, in a small number of snapshots and low SNR scenarios, even if the impact of non-ideal terms is reduced, there will still be cases where the estimators sometimes deviate from the true target. The estimators that deviate greatly from targets are regarded as outliers. Therefore, threshold detection is applied to determine whether outliers exist. After that, a pseudo-noise resampling (PR) technology is proposed to form a new data observation matrix, which further alleviates the error of the estimators. The proposed method overcomes performance degradation in a small number of snapshots or low SNRs simultaneously. Theoretical analyses and simulation results demonstrate the effectiveness and superiority.

Improving the accuracy of a digital spectral correlation-interferometric method of direction finding with analytical signal reconstruction for processing an incomplete spectrum of the signal

“…where n=0, 2, 4 are integers for a signal group of six samples. Analysis of equation (10) shows that the initial phases Ψ k.Ɩ (Ω p ) of all harmonic components of the analytical signal U Ak.Ɩ (jz) are significantly correlated and coherent within groups with even p=2n and odd p=(2n+1) frequency numbers .…”

“…This work considers the presence of inhomogeneous noise and allows the estimation of up to M-1 uncorrelated signals. In [10], using subspace methods, a joint range estimation method is applied based on the unitary advanced multiple signal classification (MUSIC) algorithm, also known as the root-MUSIC algorithm. And in [11] they struggle with random deformations of signal arrays.…”

A GaN-HEMT Active Drain-Pumped Mixer for S-Band FMCW Radar Front-End Applications

“…However, since modern radar architectures make use of a large number of receivers and transmitter modules [4,5], the presence of the LNAs represents a significant increase in the overall system cost and complexity [6]. This is even more stringent when radar classification of UAV is of concern [7][8][9]. In addition, the realization of a low-complexity reader for transponder units [10,11] requires a highly dynamic receiver with a low count of subsystems.…”