A Combined ESPRIT-MUSIC Method for FDA-MIMO Radar with Extended Range Ambiguity Using Staggered Frequency Increment

Abstract

For the problem of joint angle and range estimation with frequency diverse array (FDA), MIMO radar, staggered frequency increment is proposed to expand the range ambiguity and the joint algorithm of ESPRIT and MUSIC is proposed to reduce the computational complexity. The uniformly weighted beampattern of FDA is a SINC-like function. Therefore, the grating lobe of range estimation exists. In this paper, staggered frequency increment is proposed to increase the distance of adjacent grating lobes. The proposed joint estimation algorithm firstly estimates the angle by using ESPRIT algorithm. Then we get the range estimation by MUSIC one-dimensional range search using the above estimated angle. In simulation results section, it is indicated in simulation results that the proposed method improves the range grating lobe and reduces the complexity.

Maximum Likelihood Angle-Range Estimation for Monostatic FDA-MIMO Radar with Extended Range Ambiguity Using Subarrays

“…where θ Figure 7 shows angle CRLB and RMSE curves versus SNR and Figure 8 shows range CRLB and RMSE curves versus SNR. From Figures 7 and 8, as the SNR increases, the angle and range RMSE of paper [13], MUSIC, ESPRIT, AP-MLE, and CRLBs decrease continuously. However, the angle and range RMSE of AP-MLE is closest to angle and range CRLB.…”

“…Similarly, the range ambiguity problem also exists in FDA-MIMO radar. e range ambiguity in FDA-MIMO radar is caused by the multiple peak values in range dimension of the angle-range beamforming [13]. In this section, we explain the range ambiguity problem from the angle-range estimation principle.…”

“…In order to evaluate the estimation performance of the AP-MLE algorithm, the AP-MLE root mean square error (RMSE) of the angle and range against the SNR is compared with the MUSIC algorithm, ESPRIT algorithm (angle and range pairing algorithm in [25]), paper [13], and angle-range estimation CRLB. e CRLB expression is given by equation (28), the angle and range RMSE expressions are given by equations ( 35) and (36).…”

“…To our best knowledge, there is only one work discussing how to extend the unambiguous range of monostatic FDA-MIMO radar at present. Inspired by [5], reference [13] proposed doublepulses method to extend the unambiguous range, which is to transmit double-pulses with different frequency increments at different times. However, transmitting double-pulses at different times will reduce the real-time performance of the radar system.…”

Signal Separation and Target Localization for FDA Radar

“…However, this method didn't consider the fullband coherent receiver with full utilized spatial information. Subsequently, some research of joint range-angle estimation method with estimating signal parameters via rotational invariance techniques (ESPRIT) or multiple signal classification (MUSIC) algorithm have been explored [18], [19]. Tang et al [20] proposed a girdles compressed sensing algorithm to joint estimate range-angle.…”