IEEE 1502-2020 pdf free download – IEEE Recommended Practice for Radar Cross-Section Test Procedures.
4. Radar cross-section measurement process 4.1 Introduction Radar scattering is typically represented as the RCS of the test object. The term RCS evolved from the basic metric for radar scattering: the ratio of the power scattered from an object in units of power per solid angle (steradians) normalized to the plane-wave illumination in units of power per unit area. The RCS is thus given in units of area (or effective cross-sectional area of the target, hence the name). Note that the RCS of the test object is a property of the test object alone; it is neither a function of the radar system nor the distance between the radar and the test object, as long as the object is in the far field. Because the RCS of a target can have large amplitude variation in frequency and angle, it is expressed in units of decibels with respect to a square meter and is abbreviated as dBsm (sometimes DBSM or dBm 2 ). In terms of this definition, the RCS of a radar target is a scalar ratio of powers. If the effects of polarization and phase are included, the RCS can be characterized by the complex polarimetric scattering (CPS) matrix, which is based on one-half the real part of the complex Poynting vector. The CPS is proportional to a Hadamard product of a 2×2 matrix of the real-valued RCSs corresponding to each of the four combinations of transmit-receive polarizations and a 2×2 matrix of the complex exponentials associated with the phases of the scattered fields for the same combinations of both polarizations (Bhattacharyya, Sengupta [B6], Ruck [B64]). The measurement of the RCS of a test object requires the test object to be illuminated by an electromagnetic (EM) plane wave and the resultant scattered signal to be observed in the far field. After calibration, this process yields the RCS of the test object in units of area or the full scattering matrix (Ruck [B64]) as a set of complex scattering coefficients.
The responsibilities of the range operators from the perspective of this document are listed as follows:
Understand electromagnetic safety requirements (IEEE Std C95.1™-2019 [B33]);
Establish and document procedures for performing test measurements and follow those
procedures;
Conduct radar scattering measurements;
Process the raw measurement data for quality assurance and measurement reporting;
Calibrate the system to obtain data in standard units of RCS;
Establish the overall accuracy of the measurement range (the error bars on the RCS measurements);
Determine the accuracy of the measurement instrumentation;
Determine the quality of the illuminating plane wave;
Determine the accuracy of the calibration reference standards;
Deliver the data and documentation to the end user in a usable format.IEEE 1502 pdf download.