A NEW THRUST IN RADAR EMC DESIGN FOR THE TWENTY FIRST CE NTURY
The design requirements of MIL-STD-469. Radar Engineering Design Requirements - Electromagnetic Compatibility, are intended to restrict the radiated emissions spectra of defense radars in order to enhance electromagnetic compatibility with other cosite communications electronics. From its inception in 1966. this military standard has exerted a heavy impact on
radar procurement. Under Presidential authority, the National Telecommunications and Information Administration (NTIA) is the radio frequency allocation regulatory agency for all federal communications electronics systems. Specifically. the Radar Spectrum Engineering Criteria (RSEC) of the NTIA Manual of Regulations and Procedures for Federal Radio Frequency Management contains the national technical requirements imposed on radars during the frequency allocation process. It imposes a contrasting emissions spectrum requirement on radars for compatibility purposes. While the former imposes an absolute limit on the spectrum of pulsed radars based on frequency band and pulse width characteristics. the latter Imposes limits which are relative levels only. The spectral limitations of MIL-STD-469 are. in many instances, theoretically impossible to achieve for many defense radars while operating in the non-FM pulse mode. Operation in the pulse compression mode, however, affords somewhat easier compliance because the requirements change. In contrast, most well designed modem radars can comply with the Radar Spectrum Engineering Criteria of NTIA. The technical requirements of each standard are reviewed in historical perspective to show the developmental thrust of the forthcoming, soon-to-be issued MIL-STD-469A which will closely follow the RSEC spectrum criteria.