Time-delay estimation of off-grid targets for quadrature compressive sampling radar

Parameter-perturbed orthogonal matching pursuit is an effective technique for estimating the time-delays of off-grid targets. However, the technique consumes large computational loading because it only searches one target at each iteration. This paper develops a kind of low complexity methods, which is called parameter-perturbed band-excluded greedy reconstruction algorithms, to estimate the off-grid targets. The proposed technique combines the band-excluded technique and the greedy reconstruction methods to detect the nearest discrete grids of several off-grid targets and exploits the parameter-perturbed technique to estimate the time-delay bias between the off-grid targets and the nearest discrete grids. Taking the quadrature compressive sampling radar as an example, this paper studies the estimation performance of the proposed technique through the backtracking adaptive orthogonal matching pursuit method. Simulation results show that in comparison with other related methods, the proposed technique reduces the computational time more than one time without affecting estimation accuracy. © 2015, Chinese Institute of Electronics. All right reserved.