Cancellation of clutter and multipath is an important problem in passive bistatic radars. Some important recent algorithms such as the ECA, the SCA and the ECA-B project the received signals onto a subspace orthogonal to both clutter and pre-detected target subspaces. In this paper, we generalize the SCA algorithm and propose a novel sequential algorithm for clutter and multipath cancellation in the passive radars. This proposed sequential cancellation batch (SCB) algorithm has lower complexity and requires less memory than the mentioned methods. The SCB algorithm can be employed for static and non-static clutter cancellation. The proposed algorithm is evaluated by computer simulation under practical FM radio signals. Simulation results reveal that the SCB provides an admissible performance with lower computational complexity.

Passive bistatic radars are an important batch of scout radars that use the signals of other independent transmitters as illuminators of opportunity. Cancellation of clutter and multipath is an important problem in these radars. This problem is exacerbated as the transmitter signal is not under the control of designer. In this paper, we propose a novel algorithm for clutter and multipath cancellation in the passive radars that called sequential cancellation algorithm-batch (SCA-B). Indeed, the SCA-B is a generalization of some recent algorithms such as the ECA, the SCA and the ECA-B that act based on projecting the received signals in a subspace orthogonal to both clutter and pre-detected targets. In this paper, the SCA-B algorithm use for static and non-static clutters cancellation. The SCA-B provides an admissible performance with low complexity.

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