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Computing RMS and Integrated Array Sidelobes | IEEE Conference Publication | IEEE Xplore

Computing RMS and Integrated Array Sidelobes


Abstract:

This paper recommends a consistent and efficient approach to computing the integrated sidelobe ratio (ISLR) and the rms or mean sidelobe level of an antenna. In the propo...Show More

Abstract:

This paper recommends a consistent and efficient approach to computing the integrated sidelobe ratio (ISLR) and the rms or mean sidelobe level of an antenna. In the proposed method, radiated power (electric field amplitude squared) is integrated on the surface of a hemisphere using spherical polar coordinates. The fields are measured at positions, however, that lie on a square grid in the u-v plane. The former ensures proper integration in physical beam space, while the latter provides uniform sampling of the main lobe and all sidelobes, since these all have the same size in the u-v plane. Compared to uniform sampling in spherical coordinates, u-v plane sampling requires fewer measurements for the same accuracy and has integration boundaries that do not change shape or size with scan. Expressions are presented in both one- and two-dimensional versions, together with an example of their use.
Date of Conference: 15-18 October 2019
Date Added to IEEE Xplore: 05 March 2020
ISBN Information:
Conference Location: Waltham, MA, USA

I. Introduction

A recent study of a phased array antenna for an airborne weather radar application [1] required evaluation of the array's integrated sidelobe ratio (ISLR), which is the ratio of energy in the sidelobes of the radiation pattern to that in the main lobe. ISLR is most commonly applied to the point-spread function of a synthetic aperture radar (SAR) image, but the customer for the weather radar study specified it for the antenna pattern itself. While textbooks and papers discuss the importance of ISLR and its impact on SAR system performance, a literature search performed for the study just mentioned turned up no references to ISLR computed for an antenna radiation pattern.

References

References is not available for this document.