The 7 Common Habits of Highly Effective RF Target Simulators

Author: David J. Wayne
Publication: AMTA 2017
Copyright Owner: NSI-MI Technologies

The evaluation of RF Sensors often requires a test capability where various RF targets are presented to the Unit Under Test (UUT). These targets may need to be dynamic in time, represent multiple targets and/or decoys, emulate dynamic motion, and simulate real world RF environmental conditions. An RF Target Simulator can be employed to perform these functions and is the focus of this paper. The total test system is usually called Hardware in the Loop (HITL) involving the UUT mounted on a Flight Motion Simulator (FMS), the RF Target Simulator presenting the RF Scene, and a Simulation Computer that dynamically controls everything in real-time. The realization of a highly effective target simulator, one that truly meets the user’s needs at an affordable cost, is the result of understanding the complex interrelationship of requirements, architecture and constraints. This paper examines those relationships in seven areas of discussion, employing examples of realized systems;

  • Determining the necessary test zone volume
  • Determining the necessary quality of RF target signal
  • Sizing the field of view, range and facilities
  • Creating each target’s RF signal
  • Creating RF target motion
  • Integration and real-time operation within the range
  • Locating and minimizing the effects of error sources

Verification of Spherical Mathematical Absorber Reflection Suppression in a Combination Spherical Near-Field and Compact Antenna Test Range

Authors: S.F. Gregson, A.C. Newell, C.G. Parini
Publication: AMTA 2017
Copyright Owner: NSI-MI Technologies, Queen Mary University of London | School of Electronic Engineering and Computer Sciences

This paper presents the results of a recent study concerning the computational electromagnetic simulation of a spherical near-field (SNF) antenna test system in the presence of a compact antenna test range (CATR). The plane-wave scattering matrix approach [1, 2] allows many of the commonly encountered components within the range uncertainty budget, including range reflections, to be included within the model [3]. This paper presents the results of simulations that verify the utility of the spherical mathematical absorber reflection suppression (S-MARS) technique [3, 4] for the identification and subsequent extraction of artifacts resulting from range reflections. Although past verifications have been obtained using experimental techniques this paper, for the first time, corroborates these findings using purely computational methods. The use of MARS is particularly relevant in applications that inherently include scatterers within the test environment. Such cases include instances where a SNF test system is installed within an existing compact antenna test range (CATR) as is the configuration at the recently upgraded Queen Mary University of London (QMUL) Antenna Laboratory [5, 6]. Thus, this study focuses on this installation with results of CEM simulations being presented. The method enables a quantitative measure of the levels of suppression offered by the MARS system.

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