Joint DOD and DOA Estimation for High Speed Target Using Bistatic MIMO Radar

Jinli Chen,Weijun Long,Yanping Zhu,Jiaqiang Li,Peng Li

doi:10.1155/2014/914327

Abstract

In bistatic multiple-input multiple-output (MIMO) radar, range migration and invalidly synthesized virtual array resulting from the serious mismatch of matched filter make it difficult to estimate direction of departure (DOD) and direction of arrival (DOA) of high speed target using the traditional superresolution algorithms. In this study, a method for joint DOD and DOA estimation of high speed target using bistatic MIMO radar is proposed. After multiplying the received signals with the conjugate of the delayed versions of the transmitted signals, Fourier transform (FT) of the multiplied signals over both fast time and slow time is employed. Then, the target components of radar return corresponding to the different transmitted waveforms can be perfectly separated at the receivers by extracting the target frequency-domain data along slow-time frequency dimension when the delay between the transmitted signals and their subsequent returns is timed. By splicing the separated target components distributed along several range cells, the virtual array can be formed, and then DOD and DOA of high speed target can be estimated using the superresolution algorithm with the range migration and the mismatch of matched filter properly removed. Simulation results have proved the validity of the proposed algorithm.

Highlights

Bistatic radar with the widely separated transmitter and receiver has the advantages of covert receivers, giving increased immunity to antiradiation missiles and electronic countermeasures, and possible antistealth capabilities [1]
Assume that three high speed targets located at the same initial range cell and their direction of departure (DOD) and direction of arrival (DOA) are (30∘, 60∘), = (5∘, 40∘), and =
We evaluate the DOD and DOA estimation performance of the proposed method and the standard ESPRIT method [5] that is employed in bistatic multiple-input multipleoutput (MIMO) radar for angle estimation

Summary

Introduction

Bistatic radar with the widely separated transmitter and receiver has the advantages of covert receivers, giving increased immunity to antiradiation missiles and electronic countermeasures, and possible antistealth capabilities [1]. In [17], a long-time integration method based on Hough transform is proposed to detect the weak target without acceleration This method is capable of overcoming the problem of the range migration, but it performs poorly under the condition that the virtual array is unsuccessfully formed because of the large-scale Doppler frequency of target, and its computational burden is very huge. RFT may obtain the significant coherent integration gain without the Doppler ambiguity restriction, but, for the high speed maneuvering target detection using bistatic MIMO radar, a huge computational complexity is needed for fivedimensional joint searching of range, velocity, acceleration, DOD, and DOA. This paper makes an effort to provide a method for overcoming the effect of the large-scale Doppler frequency on the virtual array formation and removing range migration during the long-time integration, facilitating the angle estimation for high speed target in bistatic MIMO radar.

Signal Model

Joint DOD and DOA Estimation for High Speed Target

Simulation Result

Conclusions