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Measuring radar cross section at short distance

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1 Author(s)
Melin, J.O. ; Saab Missiles AB, Linköping Sweden

Radar cross sections (RCS) must be measured at large distance. We exclude here the special near-field methods. The distance (R) must be so large that different RCS contributions are added in the same way as at infinite distance. This leads to the ruleR > 2D^{2}/lambdaif the target cross range is confined withinpm D/2and a phase error ofpi /4is tolerated. It is shown, however, that if the RCS is measured as a function of an angle and is low-pass filtered with a cut off period ofphi_{c}(radians), the distance requirement could be changed toR > 4Dphi^{-1}_{c}(1 - lambda/2phi_{c}D)). All RCS measurements at such distances give approximately the same result after low-pass filtering. We assume that a set of isotropic point scatterers, accurately describes the target.

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Antennas and Propagation, IEEE Transactions on  (Volume:35 ,  Issue: 8 )