Radars Research Papers - Academia.edu (original) (raw)

Forward-scatter geometry places the radar target in diffraction region, resulting in enhanced radar cross section. Passive covert radar using forward-scatter geometry with Doppler-only geolocation can provide medium to long range early... more

Forward-scatter geometry places the radar target in diffraction region, resulting in enhanced radar cross section. Passive covert radar using forward-scatter geometry with Doppler-only geolocation can provide medium to long range early warning capability with very moderate cost. In addition to direct exploitation of target data in command and control systems, the early warning capability can be used for allocation and cueing of other air surveillance resources. Pattern-recognition and inverse-problem approaches have given a computationally light track-before-detect algorithm in time-Doppler domain. Given time series of Doppler observations from two or more transmitter-receiver baselines that observe overlapping volumes of space, various methods can be used for constructing kinematic information. The transmitter-receiver baselines can utilise different or same transmitters as long as the fields of view of the baselines have enough overlap. We present a fault-tolerant network structure of low-cost passive radar stations. Detection and classification results from a proof-of-concept version of such network are presented. The ideas are extensible to correlation receivers and other deployment geometries.

This paper presents EM performance analysis of the multilayered metamaterial FSS using TLTM method. It is shown that a multilayered metamaterial structure reveals the FSS properties. For efficacy of the method, the computed results are... more

This paper presents EM performance analysis of the multilayered metamaterial FSS using TLTM method. It is shown that a multilayered metamaterial structure reveals the FSS properties. For efficacy of the method, the computed results are validated for metamaterial FSS structure such as tri-layer radome with the reported results in the open literature. Excellent matching is found between the computed and reported results. Further, a five-layer metamaterial FSS radome is investigated for TE and TM polarizations at incidence angles 0°, 30°, 45°, and 60°. It is observed that a multilayer metamaterial FSS radome exhibit multi resonance properties with proper tuning of thickness of the layers.

The formal descriptions of data association and target-tracking algorithms are forbiddingly formidable for non-expert eyes. Evaluating performance of tracking systems commercially proposed, based on only mathematics, requires the work of... more

The formal descriptions of data association and target-tracking algorithms are forbiddingly formidable for non-expert eyes. Evaluating performance of tracking systems commercially proposed, based on only mathematics, requires the work of several full-time experts. It is still doubtful if the supplier is really implementing what the formulae describe. A subjective evaluation based on benchmark scenarios is seen to be meaningful for nontechnical decision-makers.