R. Soleti

Plume effect on radar cross section of missiles at HF band

The radar cross section of missiles at HF band is affected by the presence of the missile plume. In fact, although the plume is transparent at microwave frequencies, it reflects almost the totality of the energy at the HF band. In this paper, we evaluate the effect of the missile plume on its radar cross section (RCS) at HF band. In order to achieve this goal we: (1) verify that the missile plume can be physically represented by a plasma through a chemical analysis of the combustion; (2) define the time-varying non-linear differential equation that rules the electron density equilibrium in the plume; (3) solve the time-varying non-linear differential equation in order to evaluate the length of the plume that contributes to the RCS calculation; (4) evaluate the RCS of the missile+plume by means of the method of moments (MoM). As a numerical case, the application of both a surface and sky wave over the horizon (OTH) radar has been considered. Specifically, the RCS (as a function of the incidence angle) of the missile during the boost phase trajectory has been evaluated.

On the design of a 2D array HF skywave radar

New generation of HF skywave radars moves toward 2D array solution to get high signal to noise ratio (SNR), low probability of intercept (LPI), precise electronic scanning, faster scanning time. Critical elements for the design of such a system are radar configuration, antenna design, transmission waveforms and architecture, signal processing, radar management and control system. The goal of this paper is to provide new criteria and concepts about the design of such radars.

HF-OTH Skywave Radar: A Method for Peak Power Evaluation

This paper addresses the problem of peak power evaluation in HF OTH skywave radar. A wide number of factors affect the performance of such systems, specifically ionospheric propagation and absorption losses, as well as external radio noise interferences. A normalized version of the signal to noise ratio (SNRN) has been introduced in order to evaluate the power requirements over a wide range of environmental conditions. Finally, this paper attempts to provide a method for evaluating the peak power values required in OTH radar systems and also some useful project criteria.

Target Classification by Means of Fully Polarimetric ISAR Images

In ISAR systems, fully polarimetric capabilities have not been fully exploited for target classification or recognition. In this paper, a full system that reconstructs the polarimetric ISAR image and classifies the target is proposed and tested on simulated data.