Radar Performance Degradation due to the Presence of Wind Turbines

Wind turbines located in the vicinity of a radar system may affect the system's detection and tracking capability. A description of adverse effects is given in the paper for both primary and secondary radar. In order to judge the consequence of the shadowed volume cast by a wind turbine, results of radar performance analyses are presented. It is...

Stealth Warships; Future design aspects

Speciale camera ontdekt verborgen wapens onder kleding

Het ontdekken van onder kleding verborgen wapens of explosieven is niet eenvoudig. TNO heeft echter een nieuwe troef in handen: een experimentele millimetergolfcamara die als het ware door kleding heen kijkt

Comparison of Modelled to Measured High-Resolution ISAR Data

We have obtained modelled ISAR data for a ZSU-23-4 air defence unit using a high-fidelity 600,000 facet model and the RAPPORT RCS prediction code. These ISAR data are compared with results from the FERMAT RCS prediction code using the same facet model of the ZSU23-4. In order to analyse how well the prediction results can represent measured ISAR...

Computations and Measurements for Finite Frequency Selective Surfaces

Simulation of reflection effects for a dedicated short range microwave communication system

Reflection effects can severely degrade the performance of electronic road pricing systems in which communication must take place between a fixed road side system and an on-board unit in a moving vehicle. This degradation is caused by destructive and constructive interference between the direct-path signal and reflected signals. Such...

Radar en schaduwwerking veroorzaakt door grote windturbines

Warship Radar Signatures (Ship Survivability Part III-A)

Radar Cross Section (RCS) management is of paramount importance for a warships's survivability. In this first part of the paper (Part III-A), the operational benefits of low RCS will be explained. Basic RCS theory, measurement and simulation techniques will be addressed. The RCS of representative geometrical objects will be generated. the...

Aircraft Recognition with Radar Range Profiles using a Synthetic Database

One of the most promising signatures for Non-Cooperative Target Recognition (NCTR) with radar is the range profile. Containing information on the geometry of the aircraft, such a profile can be used for recognition. It provides substantial advantages over other radar signatures, as it can be measured relatively quick at a large range and at any...

A comparison on radar range profiles between in-flight measurements and RCS-predictions

The validation of Radar Cross Section (RCS) prediction techniques against real measurements is crucial to acquire confidence in predictions when measurements are nut available. In this paper we present the results of a comparison on one-dimensional signatures, i.e. radar range profiles. The profiles were measured from a target of opportunity, a...

Radar Cross Section Computation Using RAPPORT and the Method of Equivalent Currents, Results and Validation (abstract)

Abstract only.

In-flight measurements and RCS-predictions: A comparison on broad-side radar range profiles of a Boeing 737

The validation of Radar Cross Section (RCS) prediction techniques against real measurements is crucial to acquire confidence in predictions when measurements are not available. In this paper we present the first results of a comparison on one dimensional images, i.e., radar range profiles. The profiles were measured of a target of opportunity, a...

The finite difference time domain method on a massively parallel computer

At the Physics and Electronics Laboratory TNO much research is done in the field of computational electromagnetics (CEM). One of the tools in this field is the Finite Difference Time Domain method (FDTD), a method that has been implemented in a program in order to be able to compute electromagnetic scattering by complex objects. In this paper a...