Karin Schuler

Extraction of Virtual Scattering Centers of Vehicles by Ray-Tracing Simulations

Radar images of complex targets can be understood as a superposition of the reflected signals from a high number of scattering centers. To model complex targets for radar simulations, the plurality of scattering centers should be reduced to few significant scattering centers in order to minimize computational effort. The scope of this work is to present a technique to generate a significantly simplified RCS model of the vehicle with a limited number of virtual scattering centers, each with its own scattering characteristic, and how to group these scattering centers in a cluster database. The work is based on ray-tracing simulations of complex vehicle models. The ray-tracing simulations have been validated by measurements. The scattering centers may not be physically existing strong scattering centers, but virtual scattering centers representing a certain scattering behavior. In this paper, a technique for extracting such virtual scattering centers from a complex 3D-vehicle-model is presented. It is based on ray-tracing simulations of such models. As an example, the design model of a Ford Focus is used.

Array design for automotive digital beamforming radar system

In this paper, a digital beamforming radar system for automotive short range radar system is presented. It takes advantage of multiple transmitters for increasing the angular resolution. The main focus of this paper is on the optimization of the array configuration to obtain a system for integration into vehicles. A digital beamforming simulator shows the comparison of different configurations.

TerraSAR-X active radar ground calibrator system

In April 2006, the TerraSAR-X satellite was launched. This paper describes the development of a novel and highly integrated, digitally-controlled active SAR system calibrator (DARC). It consists of both an active transponder path for absolute radiometric calibration and a calibrated receiver chain for antenna pattern evaluation of the satellite antenna. A total of 16 active transponder and receiver systems and 17 receiver-only systems will be fabricated for a calibration campaign in 2006.

Tapering of Multitransmit Digital Beamforming Arrays

Various taper functions are well known to suppress side lobes in antenna array factors. These tapers are limited to either transmit or receive arrays and are mostly restricted to arrays with a high number of elements. This paper presents an approach for applying taper functions also to digital beamforming (DBF) arrays with transmitter multiplexing. For such DBF configurations, taper functions have not been known yet. An example for a multiple transmit DBF taper will be given which is dedicated for low number of elements.

High accuracy digitally controlled active radar ground calibrator system for TerraSAR-X

April 2006, the TerraSAR-X satellite was launched. This paper describes the development of a novel and highly integrated, digitally controlled active SAR system calibrator (DARC). It consists of both an active transponder path for absolute radiometric calibration and a calibrated receiver chain for antenna pattern evaluation of the satellite antenna. A total of 16 active transponder and receiver systems and 17 receiver only systems were fabricated for a calibration campaign in 2006.

Digital 2D imaging techniques for SRR

For safety relevant applications various types of sensors are currently brought onto the market. Short range radar (SRR) sensors offer new perspectives delivering information about the traffic scenario around the vehicle. Currently different sensor concepts for 2D imaging are being discussed. The application of coherent phase analysis for angular processing seems to be a very powerful approach. In this paper the applicability of two such like techniques-digital beam-forming and Music2D-for SRR systems is investigated. These instructions give you basic guidelines for preparing papers for conference proceedings