IEEE 1502:2007 pdf free 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. Universitics such as Syracuse University，the University of Michigan，The Ohio StateUniversity，and Georgia Institute of Technology were engaged in understanding the foundations ofscattering,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 diffraction(GTD), and physical optics (PO) weredeveloped during this period. The development of these tools was significant for the measurement process,because 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,prediction, and 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 ofISO/IEC 17025 [B17].
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 target.Before 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.
By developing standardized procedures for these and other components of the measurement process,several advantages can be realized.One important advantage is that the technical approach will beconsistent from range to range, which means that users of the data know what to expect during the testingprocess. Preparation for additional measurements or follow-on tests is easier, and it becomes significantlyeasier to make comparisons between ranges.This last point should not be minimized.This type ofcomparison is often desired, but usually it is not carried out because the procedural differences betweenranges (even of the same type) are sometimes considered too great to overcome.
Another advantage that will result from standardization is a minimization of error, especially human error.By developing and following standardized procedures，there is less chance of incorrect procedures beingused. It also helps in the verification process if standard procedures are followed at different ranges. Byusing the same basic procedures in multiple ranges,the experience base for that type of procedure isincreased, which leads to greater confidence that the procedure is robust and will produce the correct resultsunder a variety of circumstances. Finally, by using standardized procedures, there is less chance that theapplication of a particular process will be called into question if there is a problem (or legal challenge) withthe results at a later date.