Abstract
For an airborne passive radar with contaminated reference signals, the clutter caused by multipath (MP) signals involved in the reference channel (MP clutter) corrupts the covariance estimation in space-time adaptive processing (STAP). In order to overcome the severe STAP performance degradation caused by impure reference signals and off-grid effects, a novel MP clutter suppression method based on local search is proposed for airborne passive radar. In the proposed method, the global dictionary is constructed based on the sparse measurement model of MP clutter, and the global atoms that are most relevant to the residual are selected. Then, the local dictionary is designed iteratively, and local searches are performed to match real MP clutter points. Finally, the off-grid effects are mitigated, and the MP clutter is suppressed from all matched atoms. A range of simulations is conducted in order to demonstrate the effectiveness of the proposed method.
Highlights
College of Information and Electronic Engineering, Hunan City University, No 518, Yingbin East Road, College of Electrical and Information Engineering, Hunan University, No 2, Lushan South Road, Abstract: For an airborne passive radar with contaminated reference signals, the clutter caused by multipath (MP) signals involved in the reference channel (MP clutter) corrupts the covariance estimation in space-time adaptive processing (STAP)
The cascaded method (CM) based on the proposed algorithm is described, and the overall procedure of the proposed approach is summarized
1. overall procedure of CM based on the proposed algorithm is presented in Algorithm 1
Summary
The system under consideration is the airborne passive. 2. By stacking a slice of the data cube, which corresponds to the received data at one range cell, an MN × 1 vector termed as a space-time snapshot is formed. Sidering contaminated reference signal, the clutter of when two parts scatterer echoes with time bin (l + ld ) are passed through the matched filtering with the DP. NT ) MP signal, the p-th MP clutter snapshot of the l-th range cell can be expressed as the following: Nc x pc,l = ε p ∑ ξ l +l p ,i v ω p,i , θi = ε p xdc,l +(l p −ld ). The received clutter-plus-noise snapshot for the l-th range cell is modeled as the following: xl = xdc,l +. It is crucial to develop a MP clutter suppression method for off-grid effects mitigation in airborne passive radar
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