Radar-acoustic interaction for IFF applications

Abstract

This paper describes the results of an Internal Development Program (IDP) No. 97-1 conducted from August I -October 1, 1996 at the Georgia Tech Research Institute (GTRI)."] The IDP program was implemented to establish theoretical relationships and verify the interaction between X-band radar waves and ultrasonic acoustics. Low cost, off-the-shelf (OTS) components were used for the verification in order to illustrate the cost savings potential of developing and utilizing these systems. The measured data were used to calibrate the developed models of the phenomenology and to support extrapolation for radar systems which can exploit these interactions. One such exploitation is for soldier identification friendor-foe (IFF) and radar taggant concepts. Ultrasonics attractively offer an inherent low probability of intercept (LPI) capability due to their relatively high atmospheric attenuation. The described IDP program provided the phenomenological data which are being used to extrapolate concept system performances based on technological limitations and battlefield conditions for low cost IFF and taggant configurations.

5.3.1 Key design elements of a radio-acoustic-sounding system for industrial applications

“…The dependence is due to the spherically divergent acoustic wave. This is a great benefit of the focused geometry [2].…”

“…Therefore the Bragg condition must be fulfilled (1) with the radar wavelength and the acoustic wavelength. This leads to a constructive interference and afterwards to a measurable signal power [2,3]. Due to the fact that the pulsed acoustic wave (red drawn in figure 1), which moves with respect to the source and thus enables spatially resolved measurements, represents the Braggreflector, the backscattered radar signal (black drawn in figure 1) exhibits a Doppler-shift [4,5] (2) describes the speed of light ( ), and the transmit frequency of the radar.…”

Radio-Acoustic-Sounding System – berührungslose und abstandsaufgelöste akustische Temperaturmessung im industriellen Umfeld

“…3 genauer diskutiert. Ist die Bragg Bedingung (2) erfüllt, kommt es zu einer konstruktiven Interferenz der an den Phasenflächen der Schallwelle entgegen der Ausbreitungsrichtung zurückgestreuten elektromagnetischen Wellen [11,12]. Grundsätzlich gibt es zwei Betriebsarten: Continuous wave (CW) Radar mit gepulstem Schall (Abb.…”

A Novel Idea of Coherent Acoustic Wave-Induced Atmospheric Refractivity Fluctuation and Its Applications

“…The first RASS system to measure atmospheric temperature profile was born at Stanford University [5]. By the 1990s, this technique was adopted to solve the problems of measuring the temperature in indoor environment [6][7][8][9], also employed to detect the wake vortex of aircrafts [10,11], and even explored to track and detect the taggant for the soldier identification friend-or-foe application [12]. Currently, RASS can detect the atmospheric parameters below 20 km [13].…”