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Skywave over-the-horizon radar is a sensing modality that exploits signal reflection from the ionosphere in the high-frequency band (3–30 MHz) to detect and track surface or airborne targets at ranges that are an order of magnitude greater than line-of-sight radar systems. Due to the stratified nature of the ionosphere, multiple propagation paths can be supported and a single target can appear as...
In this letter, we propose a new linear predictive (LP) data extrapolation approach. It involves partitioning the spectrum into multiple spectral subbands and using a different autoregressive (AR) process to model each subband. The new extrapolation approach is then combined with the classical discrete Fourier transform (DFT) to produce a new hybrid LP-DFT spectral estimator to address the detection...
This paper addresses the problem of mitigating non-stationary diffusely scattered multipath interference or “hot clutter” by space-time adaptive processing (STAP) in radar systems that use a multi-channel receive antenna array. A computationally efficient time-varying (TV) fast-time STAP algorithm that can effectively cancel hot clutter during the coherent processing interval (CPI) while simultaneously...
The problem of blind source separation by spatial processing is considered for convolutive mixtures of narrowband sources received by a sensor array. Multipath propagation is due to time-varying doubly-spread finite impulse response channels where the signal modes are Doppler shifted and arise from diffuse scattering rather than specular reflection. This paper introduces a new blind spatial filtering...
High frequency skywave and surface-wave over-the-horizon (OTH) radars are required to detect targets in the presence of powerful clutter and interference from man-made and natural sources. However, the received disturbances may be highly structured in the time domain (i.e. pulse-to-pulse) within the coherent processing interval (CPI). This provides scope for adaptive Doppler processing to enhance...
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