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A low complexity unitary estimating signal parameter via rotational invariance techniques (ESPRIT) algorithm is presented for angle estimation in bistatic multiple-input-multiple-output (MIMO) radar. The devised algorithm only requires calculating two submatrices covariance matrix, which reduces the computation cost in comparison with subspace methods. Moreover, the signal subspace can be efficiently acquired by exploiting the NystrÖm method, which only needs

Target estimation has been a significant problem in radar systems, which has been applied in widespread in sonar, guidance systems, speech processing, communication, medical signal processing, and other fields [

According to the recent researches, several algorithms [

In this paper, we think about a bistatic MIMO radar system (Figure

Radar configuration.

In order to reduce computational complexity, we have to transform the complex data to real data by matrix method since the array, the received data, is complex data. Let

To use the NystrÖm technique [

Moreover, we must ensure that

Suppose that the EVD of

Then, according to the results from the remark, we can obtain the signal subspace without the computation of SCM and its EVD.

Suppose that the EVD of

Then, according to the unitary ESPRIT algorithm [

Then, the DODs and DOAs can be estimated by

The presented technique does not need utilizing the whole SCM. Instead, it requires calculating

In this installment, a vast number of computer simulations are demonstrated to prove the effectiveness of the proposed technique. We compare performance of the estimating angle of the presented method with the ESPRIT algorithms [

Figures

Paired results with SNR = 10 dB,

Paired results with SNR = 5 dB,

Figures

RMSE with

RMSE with

Figures

RMSE with

RMSE with

RMSE with

RMSE with

Figures

RMSE with

RMSE with

Figures

Complexity comparison with

Complexity comparison with

Complexity comparison against

Figure

Runtime comparison versus

Computations time comparison (

Transmit and receive elements | Unitary ESPRIT average runtime (s) | ESPRIT average runtime (s) | Proposed method average runtime (s) |
---|---|---|---|

0.01023 | 0.01081 | 0.00089 | |

0.04329 | 0.05503 | 0.00132 | |

0.18280 | 0.27440 | 0.00234 | |

0.59890 | 0.94800 | 0.00397 | |

1.60200 | 2.90600 | 0.00654 |

In this paper, we have developed a low complexity unitary ESPRIT method for estimating angle in the bistatic MIMO radar. Compared with the existing unitary ESPRIT and ESPRIT algorithms which require

The relevant data used to support the findings of this study are within the manuscript.

The authors declare that there are no conflicts of interest in this work.

The authors wish to express their sincere thanks to the Natural Science Research Plan in Shaanxi Province of China (General Program, no.2020JM-574), the Ph.D Science Foundation of Polytechnic University (no.107020313), the National Natural Science Foundation of China (no.62001352), and the Technology Innovation Guidance Project of Shaanxi Province of China (no.2020CGXNG-012) for their support.