IEEE 1502-2007 pdf download IEEE Recommended Practice for Radar Cross-Section Test Procedures
The ensuing period marked the beginnings of two measurement trends: the rapid development of newapproaches to making measurements, and the desire to make measurements of targets with low radar crosssection. There was a major push to significantly reduce the radar scattering from military vehicles withsuch programs as the U-2 and SR-71. Along with the objective to produce vehicles with reduced RCS camethe requirement to accurately measure these smaller signal levels. In addition, many applications requiredthe full complex polarimetric scattering matrix. Thus, there were significant efforts made to improve thetechnology of RCS measurements, including increased dynamic range and complex phasor measurements.
During this same time period, significant research was being conducted on the theory of electromagneticscattering. Universities such as Syracuse University, the University of Michigan, The Ohio StateUniversity, and Georgia Institute of Technology were engaged in understanding the foundations oscattering, with the objective of making better measurements as well as being able to analytically andnumerically predict the scattering from increasingly complex objects. Many tools in current use, such as themethod of moments (MOM), the geometrical theory of difiraction (GTD), and physical optics (PO) weredeveloped during this period. The development of these tools was significant for the measurement processbecause modern calibration methods require the ability to predict the scattering from calibration targets to ahigh degree of accuracy, Significant progress in RCS reduction requires progress in the areas of theory.predictionand measurement.
Although the technical community has made great strides in its ability to make RCS measurements, thereare still some areas in need of improvement Among these areas is the need for community-widerecognized reference standards that can be used for calibration of RCS measurements. Additionally. there isa need for a readily available standardized process for making RCS measurements. Although there iscurrently no internationally accepted set of RCS procedures for characterizing the performance of an RCSmeasurement range, Clause 7 provides guidance to organize the documentation for the operation andcharacterization of a range in accordance with ANSI-Z-540-1994-1 Bl, which is the U.S. version ofISQ/IEC 17025 B171.
This document discusses these issues and presents some approaches to addressing these deficiencies. Thedevelopment of standards and standardized practices and procedures will be discussed. Measurementtargets are often aircraft, although the development of this standard can be applied to any type of targetBefore measurement standards. procedures, and practices can be discussed, it is important to understand theorigin of the requirements, which be will be addressed in 2.2.2.
2.2.2 Radar cross-section measurement requirements
The facility used to verify RCS values should have the capability to measure RCS values that are 10-20 dBbelow the lowest scattering level to be encountered while illuminating an area the full size of the object.
Although these capabilities may be achievable with the current state of the art, care should be taken toaccurately and repeatedly achieve results. The obvious questions that can be raised include “How is theRCS test range accuracy defined?” “How close to the exact value does the measured value have to be?””How is the exact value defined?” “How close does a value have to be to be repeatable?” These questionsand others should be addressed to develop standards and standardized practices.
IEEE 1502-2007 pdf download
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