A New Stealthy Target Detection based on Stratospheric Balloon-borne Radar System

Abstract

A novel detection for stealthy target model F-117A with a higher aspect vision is introduced by using Stratospheric Balloon-borne Bistatic radar system. The potential problem of proposed scheme is platform instability impacted on the balloon by external wind force. The flight control system is studied in detail under typical random process, which is defined by Dryden turbulence Spectrum. To accurately detect the stealthy target model, a real Radar Cross Section (RCS) based on physical optics (PO) formulation is applied. The detection of proposed scheme has been improved due to increasing PO-scattering field of stealthy model with higher aspect angle comparing to the conventional Ground-based system. Simulations demonstrate that proposed scheme gives much higher location accuracy and reduces location errors.

Novel Anti-Stealth on Sub-Nyquist Scattering Wave Deception Jammer With Stratospheric Balloon-Borne Bistatic Radar Using KA-STAP-FTRAB Algorithm

“…In general, a stealth RCS can be modeled as a group of individual scattering centers distributed over the stealth target [24]. A facet model is proposed to simulate the radar back-scattering of moving stealth target F-117 [10][11][12]. Stealth target is modeled by a series of triangular facets as shown in Fig.…”

“…1 shows typical bistatic balloonborne radar geometry joint Ground SN-SWDJ source under ground plane effect. There are two different paths for stealth signal with SN-SWDJ effect to travel between balloon-borne bistatic radar and target: One is the direct path (D) and other is the indirect path (I), which refers to the special separation of transmitter and receiver [10][11][12]. Therefore, there will be six different round trip path lengths:…”

“…The clutter signal depends on two reflecting signals (true and false stealth target signals), and introduces the dependency of looking direction as well as bistatic Doppler frequency , thus × dimensional space-time SV for bistatic clutter patch × model is determined by [25] , = ⊗ (11) as the Kronecker product of a bistatic Doppler component , which describes the linear phase progression in Doppler across pulses, while a spatial component , which accounts for the phase progression across the elements of the receive antenna and function of its azimuth angle and elevation angle as:…”

“…The previous researches did not evaluate the stealth target detection on SN-SWDJ effect with a higher aspect vision. The RCS performance of a true stealth target may be better with a high aspect vision comparing to the SN-SWDJ"RCS with a lower aspect vision based on ground station [10][11][12]. So the bistatic radar system should be mounted on higher altitude platforms to achieve a high probability of detection for stealth target in SN-SWDJ effect.…”

“…In this paper, we investigate a novel detection technique for F-117A stealth model in SN-SWDJ effect based on balloon-borne bistatic radar system. The F-117A stealth is modeled by the triangular facets" approach of the moving complex targets, which provides an accurate scattering RCS calculation [24], [6], [10][11][12]. The bistatic stations are located in the stratosphere about 21 km above the Earth and kept stable in a sphere of 0.5 km radius [10][11][12].…”